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Award Winning LOFlo®

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IntroductionDesigners know that the demand

or super eicient comort systems

grows each day. The industry has

responded with a variety o new

“Green” hydronic products and sys-

tem concepts that yield dramatic

beneits over the traditional and

conventional airside designs o the

past.

The award-winning Taco LOFlo®

Mixing Block (LMB) is one such

product that sets a new standard

or comort, ease o design, and

superior energy perormance in

small to large buildings. The LOFlo

Mixing Block can easily be incor-

porated into heating and cooling

systems or cost-eective results in

a variety o areas. When employed

in conjunction with Taco’s latest

system approaches, outstanding

beneits accrue to designers, install-

ers, owners, and users alike.

The LOFlo® Concept The LMB is a complete injection

mixing station contained in a sim-

ple actory-assembled package that

controls each individual zone at the

lowest possible low rate by main-

taining the highest possible supply

water temperatures in cooling and

lowest possible supply water tem-

peratures in heating.

The LMB consists o a single cast

header that unctions as a hydraulic

separator to which small circulators

are attached – one or the primary

system low and the other an injec-

tion circulator that adjusts to pre-

cisely match the required load on a

given zone.

When installed within modern radi-

ant systems ( wall, loor, or ceiling

panels) or chilled beam systems

(active or passive), only 2 pipes are

needed. Flow rates are reduced

since there are no control valves,

balancing valves, or piping losses to

overcome. The small, reliable circu-

lators take the place o all o these

components. The LMB automatical-

ly provides only the low and tem-

perature o water needed to satisythe zone load at any given time.

Figure 1 illustrates how the water

supply rom the primary circuit

enters the LMB at Port (Ps). The

return water rom the secondary

terminal loop enters the LMB at

terminal (Tr). As the terminal unit

calls or either heating or cooling,

the Injection Circulator (Ci) varies

in speed / low to blend the two

water temperatures to satisy the

Ps

Ts

Pr

Tr

Figure 1

Features & Benefits

Ci

Cz

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Page 3

needs o the zone. This blended

supply water is sent to the termi-

nal though Port (Ts) and primary

return water exits the LMB at Port

(Pr). A variety o sizes o LOFlo mix-

ing blocks can handle lows up to

30 gpm, making them suitable or

almost all installations.

The LoadMatch® CirculatorLoadMatch circulators are designed

or quiet, eicient, reliable operation

on the LOFlo® mixing blocks used

in hydronic cooling and heating

systems. This amily o circulators

includes a removable Integral Flow

Check valve (IFC®) that prevents

unwanted gravity low and reduces

installation costs. An anti-conden-sate bale prevents the build up

o condensate on the motor wind-

ings when the circulator is pump-

ing chilled water. All connections

to the mixing block casting are

langed to make installation a snap.

With no mechanical seals,

this sel-lubricating, mainte-

nance ree design provides

unmatched reliability.

However, in the

unlikely event

that a circulator

repair is needed,

our unique,

replaceable car-

tridge contains

all o the moving

parts and is easily replaced in

the ield without disturbing

piping connections.

All LoadMatch circulators

have a design working pressure o

200 psi, making them suitable or

medium and high rise construction

without having to install hydrauli-

cally isolated subsystems.

They can also be

used in inte-

grated piping

systems utilizing

ire protection piping to

meet NFPA Chapter 13

pressure ratings o 175 psi.

Features & Benefits

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1

2

3

4

5

6

7

8

9

10

11

12

14

15

13

(#1) Integral Flow Check (IFC®) —

prevents gravity low.

(#2) Casing — Cast Iron, Bronze or

Stainless Steel

(#3) Casing O-ring — EPDM

(#4) Impeller — Polypropylene

30% glass illed

(#5) Dirt Barrier — Keeps system dirt

away rom bearings.

(#6) Front Bearing Support

Assembly — Brass with carbon

bearings or smooth operation

and long lie.

(#7) Thrust Washer — Prevents noise

and wear on rotor / ront bearing.

(#8) Spacer Washer

(#9) Rotor / Shaft — Steel rotor, hollow

ceramic impeller shat.

(#10) Rear Bearing Support Assembly

(#11) Cartridge Sleeve — Stainless Steel.

(#12) Cartridge Support Plate — Seals

cartridge and casing O-ring.

(#13) Anti-Condensate Baffle — Allows

or ambient air low, prevents build-up

o condensate on motor.

(#14) Stator — Permanent split capacitor.

(#15) Motor Housing/Capacitor

Box Assembly

Features & Benefits

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Applications

Radiant CoolingRadiant heating systems have been

around or several thousand years.

They were irst used by the Romans

to heat their public baths. A new

member o the amily recently

entered our consciousness….

radiant cooling and chilled beams.

Radiant cooling and chilled beam

systems have progressed in the last

ew decades, garnering attention

as a comortable — yet energy and

material eicient option or HVAC

systems.

Although these systems have

been used in Europe or over 20

years, they are now starting to beexamined — and installed — in

the United States.

What makes this technology so

interesting is its broad applicability

or commercial structures. A

key advantage is that a radiant

cooling or chilled beam system

requires very little ceiling space.

This is the case because water —

the main transporter o thermal

energy — is much denser than

air and has a higher speciic heat.

This permits a very high energy

carrying capacity and a smaller

transport system….pipes. A

orced-air system is, by its very

nature, greatly less eicient and

requires large ducts to transport

Btu’s.

Figure 2 illustrates that a one inch

diameter water pipe can transport

the same cooling energy as an 18

inch square air duct. The use o

chilled beams can thus dramatically

reduce air handler and ductwork

sizes, and an horsepower enabling

more eicient use o both horizon-

tal and vertical building space.

Figure 2 — Cooling Energy Transport, Economy o Water vs. Air

18” x 18”Air Duct

1” DiameterWater Pipe

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VAV Air System

100% Peak Power (Cooling)

78% Peak PowerDistributionSystems

45%

Chiller and Tower

55%

Radiant Cooling/Chilled BeamHydronic System

67%

33%

Pumps

Fans

Air Transport Loads

Other Chiller Loads

Figure 3 — Building Heights

For a typical building this results in a

lower building height (and cost) as

shown in Figure 3.

Compared with air systems, radiant

cooling and chilled beam hydronic

systems use approximately hal the

horsepower to move heating and

cooling energy within a building.

This can reduce the overall electrical

energy demand o a radiant cool-

ing or chilled beam system by up to

25% over a typical all air VAV system

as shown in Figure 4.

Figure 4 — Reduction in horsepower or a Radiant Cooling/Chilled Beam System

Air System with large ducts Hydronic system with small pipes

Applications

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With radiant cooling systems,

chilled water circulates through

tubing attached or embedded in a

metal ceiling panel to remove heat

rom a space as shown in Figure 5.

This is typically reerred

to as a chilled ceiling system.

Approximately 50 to 60 % o the

heat transer rom a radiant chilled

panel is radiant, while 40 to 50%

is convective. Chilled water tem-

perature must be above the dew

point—between 55°F and 60°F—to

prevent condensation rom orm-

ing on the bottom o the panels.

Thereore, the driving orce —or

approach—between chilled water

and a room is reduced to 15°F to20°F. This is approximately hal o a

conventional chilled-water system

using 40°F to 45°F chilled water,

which achieves an approach o 30°F

to 35°F. As a result, higher chilled-

water ow rates are required to

achieve reasonable capacities o

the chilled ceiling panels.

Radiant cooling and chilled beams

use chilled water temperature dier-

ences or delta T’s o 4°F to 5°F.

Conventional chilled water systems

use chilled water delta Ts o 8°F to12°F. Chilled-water ow rates or

radiant cooling and chilled beam

systems are approximately double

those o conventional chilled-water

systems.

This means that the pumps, piping

and horsepower or the pumps are

also double.

Even with higher ow rates, chilled

ceiling panels have relatively low

capacities, ranging rom 20 to 40

Btuh per square oot o panel area.While this is adequate or cooling

loads o interior spaces, it may not

be adequate or exterior spaces.

Exterior spaces with larger glass

areas can approach 60 to 70 Btuh

per square oot o oor area.

For ull sensible cooling in exterior

spaces, the cooling load must be

reduced or the chilled ceiling panels

supplemented with other cooling

sources.

Figure 5 — Chilled Ceiling Panels

Applications

ChilledWater

Supply

ChilledWater

Return

50 to60%

Radiant

40 to 50% Convective

56˚F to 62˚F 60˚F to 66˚F

T = 4˚F to 5˚F

Cutaway of Chilled Ceiling Panel

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Solar load can be reduced by using

window-shading devices, such as

interior blinds or exterior sun shades

that close when windows are ex-

posed to direct sunlight. Additional

cooling sources include chilled

walls or oor panels as shown in

Figure 6.

Typical capacities of these panels:

• Ceiling - 20 to 40 btu/sq. t

• Walls – 15 to 25 btu/sq. t

• Floors – 10 to 15 btu/sq. t

Chilled beam and radiant cooling

systems (chilled ceiling, wall or oor

panels) also provide sensible cool-

ing only using higher temperature

chilled water above the dew point.

Latent cooling or dehumidifcation

is provided by a separate decoupled

100% Dedicated Outdoor Air Sys-

tem (DOAS). This is accomplished

by slightly pressurizing the building

with dry treated outdoor air rom

the DOAS unit to prevent the infl-

tration o warm moist outside air.

The biggest advantage to decou-

pling sensible and latent loads is

substantial airow reduction. A

typical air-based cooling system will

require 8 to 12 air changes per houro recirculated and outside air. A

radiant cooling or chilled beam sys-

tem, employing a DOAS, will require

1 to 2 changes o outside air per

hour only. This reduces the horse-

power and materials required to

move air by up to 10 times.

Passive Chilled Beams

The Europeans discovered rom

their experience that by lowering

the chilled ceiling panel below

the ceiling that the convective cool-

ing component o the panel could

be increased. This satisfedthe increased cooling loads rom

the increased use o computers

seen in the 1990s. There also

was a desire to provide higher cool-

ing capacities or exterior zones to

provide better overall comort.

By lowering the panel below the

ceiling and making it an open coil,

as shown in Figure 7, the capacity o

the chilled panel can be increased.

The industry has designated this

Figure 6 — Wall and Floor Radiant Panels

Applications

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Roof/Floor Slab

Threaded

Rod

Convective

Coil

Figure 7 — Passive Chilled Beam

SuspendedCeiling

InducedRoom Air

Primary Air Plenum

Cooling Coil

Primary Air Nozzles

Primary Cold Air

Mixed Supply Air(Coanda Eect)

Figure 8 — Active Chilled Beam

Applications

confguration a “passive chilled

beam.” It resembles a (structural)

beam when mounted below

the ceiling. It is passive since the

convective cooling component is

natural convection.

As shown in Figure 7 warm air

plumes rom the room rise naturally

(convectively) and create a warm

air pool in the upper portion o the

space (or ceiling cavity). As this air

contacts the coil surace, the heat

is removed which causes it to drop

back into the space. In this applica-

tion the convective component o

the cooling increases to about 85%

o the total heat removal and it also

increases the total capacity to 120to 150 Btuh/sq. t. o panel area.

Active Chilled Beams To urther increase a chilled beam’s

cooling capacity, conditioned

ventilation air rom the DOAS can

be used to ow air through a chilled

coil, urther increasing the beam’s

convective component by using

orced convection. This confgu-

ration is reerred to as an “active

chilled beam” as shown in Figure 8.

Slot Difuser Active Chilled Beam

Chilled Beam Structural Beam

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Chilled Beam

Zone Circulator

Injection Circulator

Primary Circuit

LOFlo®MixingBlock

58˚F 62˚F

45˚F 62˚F

45˚F 46˚F

Ventilation air rom the DOAS is

introduced to a chilled beam into a

plenum above the coil and through

a venturi, generating a higher

velocity and, subsequently, a lower-

pressure region inside the lower

plenum in the chilled beam. This

low-pressure region induces room

air to ow through the chilled coil

and mix with primary air rom the

DOAS. The airow over the chilled

coil is reversed or an active chilled

beam, and the induced room air

ows up through the coil.

Active chilled beams are sometimes

reerred to as “induction diusers.”

They are really 1970’s induction

unit technology, only mounted ina ceiling and supplied with high

temperature chilled water.

Air rom an active chilled beam is in-

troduced into a space through a slot

diuser, creating a Coanda eect.

This eliminates drats by preventing

the chilled beam rom “dumping”

cold air. The Coanda eect is the

ability o a cold air stream to hug the

ceiling and not dump. This is the

case because the air is discharged at

higher velocity by the slot diuser

creating an upward orce rom the

static pressure dierence between

the air stream and the room (Ber-

noulli’s Principle). This orces the

cold air to hug the ceiling and not

dump.

Inducing warm room air to blow

through a chilled coil substantially

increases chilled-beam capacity.

Active-chilled-beam capacities

range rom 400 to 600 Btuh per

square oot o beam or beam-coil

area. Depending on the tempera-

ture and quantity o primary supply

air rom a DOAS, this can add an ad-

ditional 300 to 400 Btuh per square

oot o beam or beam-coil area. Anactive chilled beam can thereore

deliver rom 700 to 1000 Btuh per

square oot o beam or beam-coil

area between the chilled coil and

primary air.

LOFlo® SystemI the chilled water ow rate o a

radiant cooling or chilled beam

system can be reduced to that o a

conventional system, peak power

demand can be reduced even ur-

ther. Injection pumping can achieve

this goal. It has been used in radiant

heating systems or a number o

years, lowering 180°F boiler water

to the 100°F to 120°F needed or a

radiant oor panel.

The same principal can be applied

to a radiant cooling or chilled beam

system in reverse by raising 40°F

to 45°F chilled water to the 55°F to

60°F required by a chilled ceiling

or chilled beam. Figure 9 shows a

piping layout or an injection mixing

circuit that mixes low temperature

(45˚F) chilled water to the higher

temperature (58˚F) required by a

chilled beam.

Figure 9LOFlo® Injection Mixing Circuit

Applications

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The LOFlo® Mixing Block (LMB) is

not constrained by the primary sup-

ply water temperature, but rather

it can supply the precise tempera-

tures required through its unique

injection eature. The LMB also

eliminates the need or o-checks

since they are built-in to the circula-

tor body.

The LMB is a packaged unit that

includes an injection circulator

and zone circulator. The injection

circulator is controlled by variable

speed to maintain the supply water

setpoint (58˚F) to the chilled beam.

The zone circulator is controlled

by the room thermostat. It can be

either constant or variable speed.

I you are already amiliar with the

innovative Taco LoadMatch® Sys-

tem, it’s easy to see how the LOFlo®

Mixing Block makes a simple system

even better. The LOFlo® design uses

a single pipe primary distribution

system that is decoupled rom the

individual space loads. Small

circulators are used or each zone

(an coil, air handler, or other type o

terminal unit) to provide either on/

o or variable speed ow control.

The simplicity o the LOFlo® concept

allows a single pipe size or the pri-

mary distribution system. The total

BTU load and delta T determines the

required ow and pipe size. Once

this has been done, the number o

secondary loops is simply a matter

o space conditioning locations.

There is no need to account or

added pressure drops in the sec-

ondary circuits due to piping

lengths, balancing valves, check

valves, etc. Thus, primary pump size

is smaller, piping sizes and

arrangements are simplifed, and

the small circulators are selected to

account or secondary

pump runs and accessories.

A typical LOFlo® system applica-

tion is shown in Figure 10. This is

a chilled beam system utilizing 4

active chilled beam terminal units

in a single pipe cooling system.

The diagram clearly illustrates the

simplicity o this system.

The LMB allows the designer to

use a 42°F supply water tempera-

ture and a delta T o 16°F vs. that

required by the chilled beams o

58°F with a delta T o 4°F. The LMB

will vary the ow o supply water

so that each terminal is satisfed

at the higher temperature and

the lower delta T.

Figure 10

LOFlo® System

Chiller

Terminal Unit(Chilled Beam)

LOFlo Mixing Block

Dedicated Coil Circulators(Control valves not required)

Expansion Tank

Single Pipe Loop

Primary System Pump

Air Separator42˚F 58˚F

Applications

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Page 12

AirSystem

100% Peak Power (Cooling)

78% Peak PowerDistributionSystems

45%

Chiller and Tower

55%

RadiantCooling System

67% Peak Power

Low Temperature LoFloRadiant Cooling System

80%

20%

Pumps

Fans

Air Transport Loads

Other Chiller Loads

This change in the primary loop

temperature allows a much lower

ow rate and thus requires a smaller

pipe diameter. In act, the primary

circuit ow is typically reduced

by 75%! This is the case because a

LOFlo® system uses a primary circuit

delta T o 16˚F to 20˚F vs. a con-

ventional radiant cooling or chilled

beam system o 4˚F to 5˚F.

Figure 11 shows a comparison o

peak power demand or a LOFlo®

injection pumping system vs. an all

air VAV system and a conventional

radiant cooling/chilled beam sys-

tem. The peak power demand o a

low-ow injection-pumping radiant

cooling system is up to 35% lessthan that o an all air system. The

transport energy or this type o ra-

diant cooling/chilled beam system

is only 20% o the total energy o an

HVAC system.

In addition to energy savings a

LOFlo® system can provide better

comort. This is a result o less air

delivered and thereore less evapo-

rative cooling eects on the build-ing occupant’s skin. The system is

also quieter because o the reduced

air volumes.

The system can also deliver dier-

ent supply water temperatures to

various types o terminal units or

increased versatility and comort as

shown in Figure 12. In this example

the chilled beams and chilled ceil-

ings require 60˚F supply water, theheat pumps 80˚F supply water, the

DOAS unit 42˚F supply water and the

an coils less than 50˚F supply water.

All o these dierent supply water

temperatures can be supplied rom a

single chilled water pipe at 42˚F!

Figure 11 — Reduction in horsepower or a LOFlo® System

Applications

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Page 13

42˚F 60˚F

42˚F

50˚F

46˚F

60˚F 64˚F

6 4˚ F 4 9̊ F 57˚F 53˚F

60˚F 64˚F

64˚F 56˚F

80˚F 90˚F

90˚F

46˚F 49˚F 53˚F 56˚F 60˚F

Fan Coil Chilled Ceiling Heat PumpChilled Beam

Air Separator

Primary System Pump

Dedicated OutsideAir Unit (DOAS)

Low Temperature Chiller

Expansion Tank

Figure 12 — Varying Supply Water Temperatures

Applications

In this “green” system, each terminal

unit is essentially decoupled rom

the primary loop. Each will operate

automatically to control the load in

the zone. Each terminal unit and

LMB are easily connected to the

primary loop through a Taco Twin-

Tee®, a patented single pipe itting

designed to replace two primary

circuit tees used when connect-

ing a secondary load in a hydronic

system.

A cutaway o the Twin-Tee® is

shown in Figure 13. You can see

that there is an absolute minimum

distance between the supply and

return connections to the second-

ary loop. This design ensures no

pressure drop between takeos.

The internal bale prevents any

short circuiting o secondary low

between supply and return. InternalBafe

PrimaryCircuit Flow

Secondary Circuit

Return

Supply

PrimaryCircuit Flow

Figure 13 The Twin-Tee reduces the num-

ber and costs o ittings and labor

required to connect secondary

loops to the primary circuit. And it

is oered in a wide variety o sizes

and connection types to meet any

ield requirement.

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Page 14

Chilled Beam(Typical)

62˚F58˚F

High TemperatureChiller (4˚F ∆T)

PrimaryPump

42˚F 52˚F

Fan Coil(Entrances)


PrimaryPump

Low TemperatureChiller (10˚F ∆T)

Applications

In a typical chilled beam system

there is a requirement or two sepa-

rate chilled water systems.

The irst system is a low tempera-

ture (40˚F to 45˚F) chilled water

system or the DOAS unit or whole

building dehumidiication and or

an coils at the entrances or local

dehumidiication, see Figure 14. The

an coils are needed at entrances

when the inrush o humid outdoor

air overwhelms the slight building

positive pressure rom the DOAS

when a door is opened.

The second system is a high tem-

perature (55˚F to 60˚F) chilled water

system or the chilled beams,see Figure 15.

Figure 14 — Low Temperature Chilled Water System

Figure 15 — High Temperature Chilled Water System

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Page 15


PrimaryPump

Fan Coil(Entrances)



58˚F 62˚F 58˚F

58˚F

58˚F

45˚F

42˚F

62˚F

Applications

This results in a complicated system

with two complete chilled water

systems including chillers, pumps,

air separators, expansion tanks and

piping as shown in Figure 16.

A better solution is the use o a

LOFlo® injection pumping system

that can deliver dierent chilled

water temperatures with a single

chilled water system. The LOFlo®

System utilizing the LOFlo® Mixing

Block reduces the number o pipes

as shown in Figure 17. The LOFlo®

System also reduces the size o the

pipes, pumps and pump horse-

power.

Fan Coil(Entrances)



PrimaryPump

42˚F 52˚F58˚F 62˚F

High TemperatureChiller (4˚F ∆T)


PrimaryPump

Figure 16 —Dual Temperature Chilled Water System

Figure 17 — LOFlo® Single Pipe Injection Mixing System

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Page 16

You can download all the elements of the Taco Design Suite. They are free!

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Calculates design loads and lows

Hydronic System Solutions®

Our acclaimed HVAC system design toolSystem Analysis Tool® 2.0

Evaluate System Operating and Lie Cycle Costs

or Alternative Systems Designs, Size Piping

and Selection o Equipment

Taco Net®

Schedule All Equipment and Components

LoadMatch® Design “Wizard”

Produce AutoCAD drawings o all Systems

Generate Complete Speciications

Include BIM Autodesk® Revit® Filesor All Taco Products

System Design Tools

System design made easy Take the mystery out o LoadMatch®,

LOFlo® and Chilled Beam system

design with our ree Taco Design

Suite sotware. This useul collection

o integrated computer tools allows

you to design, analyze, optimize,

revise and render Green Building

Designs in minutes instead o hours.

The Suite is easy to learn and ully

supported online at our web site.

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Page 17

Taco’s Advanced Hydronic Systems

Lower Operating Cost

Lower Maintenance Cost

Lower Installed Cost

Comfort technology thatsaves energy, time, and rawmaterials.

Taco’s quest or systems and prod-

ucts that deliver innovative and

eective solutions to today’s cool-

ing and heating systems has lead

the company to breakthroughs

that have proven themselves in

hundreds o installations and

thousands o evaluated designs.

LoadMatch® is now recognized

as an integral part o any Green

Building design. Actual installa-

tions have proven to lower energy

consumption by 25% and reduce

installed costs by as much as 5 to

20%.

The LOFloTM Mixing Block is

another extension o the many

product innovations oered by

Taco. Through the use o main-

tenance-ree, low-cost, reliable

circulators assembled onto a com-

pact casting (a hydraulic separa-

tor) and connected to a primary

loop, Taco has urther reduced

the installed cost o piping and

controls while greatly increasing

the eiciency o its connected ter-

minal unit.

Chilled Beam systems are now

being added to this portolio o

Advanced Hydronic systems with

similar beneits and design attri-

butes. While LoadMatch® greatly

reduces pump horsepower,

chilled beam systems greatly

reduce an horsepower, control

system complexity, and sound

levels in conditioned spaces. We

expect this concept to rapidly

grow over the coming years and

to achieve the same status o that

o the LoadMatch® system.

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Page 18

Selection Procedure

How to select theLOFlo® Mixing Block Selection o the proper LMB or

each terminal unit is quick and easy.

The important point to remember

is that the LMB decouples the ter-

minal loop rom the primary loop

and it behaves as its own “system”.

In act, the selection o the correct

LMB is just a matter o selecting

the two independent circulators

comprising the two loops o this

independent zone system.

Figure 18 shows the LMB in a cool-

ing system with a total load o

90,000 MBH. This is the irst o 3

chilled beam terminal circuits in

the system that handled the load o 30,000 MBH. In order to select the

proper LMB, you simply break this

circuit into two loops and select

each circulator or the loop they

control.

PRIMARY1-1/2”

Shuto Valves

45˚F 49.3˚F

62˚F

30,000 BTU/H

Zone15 GPM58˚F

15’ Pipe

1-1/4”

10’ Pipe3/4”

LMB-1

Injection3.53 GPM

45˚F

Figure 18

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Page 19

Selecting the LOFlo®Mixing Block InjectionCirculatorFigure 19 is the primary loop o the

LMB. It handles the supply water

o the main system loop and is

PRIMARY1-1/2”

45˚F 49.3˚F

10’ Pipe3/4”

LMB-1

Injection3.53 GPM

45˚F

Figure 19

Selection Procedure — 60 Hz Example

Selecting the LOFlo®

Mixing Block ZoneCirculator The zone circulator shown in Figure

20 is selected in the same manner

as the primary circulator. However,

30,000 BTU/HZone

15 GPM58˚F

15’ Pipe1-1/4”

Figure 20

this time you must remember that

you are working in an entirely di-

erent loop that has a low that is

much more than that in the pri-

mary loop.

In this example, the low is 15.0 gpm.

Next you determine the head in the

zone loop.

30’ o 1-1/4” pipe = 1.4 t.

Terminal Pressure Drop = 8.0 t.

Total Head 9.4 t.

Using the pump curves shown on

Pages 24 and 25 , select the Zone

Circulator or 15.0 gpm @ 9.4 t.

head.

The proper selection o the ZoneCirculator is model L1121.

connected via a Twin Tee®. This cir-

culator is the Injection Circulator

and is selected or the loop flow o

3.53 gpm and the actual pressure

drop o the circuit.

This circuit utilizes a High delta T

(62˚F - 45˚F = 17˚F) and a very low

low since it takes supply water at

45˚F and injects it into the terminal

loop in order to achieve an enter-

ing water temperature o 58˚F with

a leaving temperature o 62˚F.

In order to make the circulator

selection, you must determine the

head in this circuit.

20’ o 3/4” pipe = 9.3 t.

(2) 3/4” ball valves = .28 t.

(1) Twin Tee® = .2 t.

Total Head 1.41 t.

Using the pump curves shown

on Page 16 , select the Injection

Circulator or 3.53 gpm @ 1.41 t.

head.

The proper selection o the

Injection Circulator is model

L0410.

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Page 21

Technical Data

For Indoor

use only

Features

• Built-In Hydraulic Separator

• Stainless Steel Casing

• Flanged Connections

• Integral Flow Check (IFC®)

Prevents gravity low

Eliminates separatein-line low check

Reduces installed cost,easy to service

Improved perormance vs.In-line low checks

• Exclusive ACB — Anti-CondensateBale - protects motor windingsagainst condensate build-up

• Unique replaceable cartridge— Field serviceable

• Unmatched reliability-Maintenance free

• Quiet, efficient operation

• Direct drive-Low power consumption

• Self lubricating, No mechanical seal

• Standard high capacity output

• Compact design

Materials of Construction

Casing (Volute): Cast Iron or Bronze

Integral Flow Check:Body, Plunger..............Acetal

O-ring Seals..................EPDM

Spring ..............................Stainless Steel

Stator Housing: Steel or Aluminum

Cartridge: Stainless Steel

Impeller: Non-Metallic

Shat: Ceramic

Bearings: Carbon

O-Ring & Gaskets: EPDM

Standard Optional

Flange Orientation

Performance Data

Minimum Fluid Temperature:32˚F (0˚C)

Maximum Fluid Temperature:230°F (110˚C) Cast Iron

220°F (104˚C) Bronze

Maximum Working Pressure:200 psi

Connection Sizes:3/4”, 1”, 1-1/4”, 1-1/2” Flanged

1/2”, 3/4” Sweat

L1111 onlyStandard

Mounting Positions

Electrical Data

Model

L0410

L0609

L0710

L0515

L0435

L1111

L1130

L1034

L1121

HP

1/40

1/35

1/25

1/25

1/8

1/8

1/8

1/6

1/8

3250RPM, 60HzSingle Phase

2750RPM, 50HzSingle Phase

115V, Amps

0.52

0.52

0.71

0.79

1.40

1.10

1.90

2.00

1.45

100/110V, Amps

0.50

0.52

0.71

0.79

1.60

1.60

1.76

2.00

1.80

7/27/2019 100-85


Page 22

Dimensional Data

K

B

A

C

L

N

JM

F

D

E

ZONE

CIRCULATOR

INJECTION

CIRCULATOR

All Parts Feature Flanged Connections

7/27/2019 100-85


Page 23

Part Numbers and Dimensional Data

INJECTIONCIRCULATOR

(VariableSpeed)

ZONECIRCULATOR

(VariableSpeed)

LOFlo™

PART NUMBER

A

in (mm)

B

in (mm)

C

in (mm)

D

in (mm)

E

in (mm)

F

in (mm)

J

in (mm)

K

in (mm)

L

in (mm)

M

in (mm)

N

in (mm)

SHIPWEIGHTlbs (Kg)

L0410D

L0410V LMB0410D-0410V-Y 61 ⁄ 4 (159) 61 ⁄ 4 (159) 33 ⁄ 16 (81) 215 ⁄ 16 (75) 5 (127) 63 ⁄ 8 (162) 6 (152) 61 ⁄ 8 (156) 187 ⁄ 8 (479) 141 ⁄ 4 (362) 5 (127) 19 (8.6)

L0609V LMB0410D-0609V-Y 55 ⁄ 8 (143) 4 (102) 33 ⁄ 16 (81) 215 ⁄ 16 (75) 5 (127) 63 ⁄ 8 (162) 6 (152) 61 ⁄ 8 (156) 187 ⁄ 8 (479) 12 (305) 5 (127) 20 (9.1 )

L0710V LMB0410D-0710V-Y 57 ⁄ 8 (149) 41 ⁄ 2 (114) 33 ⁄ 16 (81) 215 ⁄ 16 (75) 5 (127) 63 ⁄ 8 (162) 6 (152) 61 ⁄ 8 (156) 187 ⁄ 8 (479) 121 ⁄ 2 (318) 5 (127) 21 (9.5)

L0515V LMB0410D-0515V-Y 515 ⁄ 16 (151) 41 ⁄ 2 (114) 33 ⁄ 16 (81) 215 ⁄ 16 (75) 5 (127) 63 ⁄ 8 (162) 6 (152) 61 ⁄ 8 (156) 187 ⁄ 8 (479) 121 ⁄ 2 (318) 5 (127) 21 (9.5)

L1111V LMB0410D-1111V-Y 71 ⁄ 4 (184 ) 55 ⁄ 16 (135) 33 ⁄ 16 (81) 35 ⁄ 16 (84) 53 ⁄ 8 (137) 63 ⁄ 8 (162) 6 (152) 61 ⁄ 8 (156) 187 ⁄ 8 (479) 135 ⁄ 16 (338) 53 ⁄ 8 (137) 22 (10.0)

L0435V LMB0410D-0435V-Y 7 (178) 511 ⁄ 16 (144) 33 ⁄ 16 (81) 33 ⁄ 8 (86) 51 ⁄ 2 (140) 63 ⁄ 8 (162) 6 (152) 61 ⁄ 8 (156) 187 ⁄ 8 (479) 1311 ⁄ 16 (348) 57 ⁄ 16 (138) 22 (10.0)

L1121V LMB0410D-1121V-Y 71 ⁄ 4 (184) 53 ⁄ 4 (146) 31 ⁄ 4 (83) 35 ⁄ 16 (84) 51 ⁄ 2 (140) 61 ⁄ 2 (165) 6 (152) 61 ⁄ 8 (156) 19 (483) 133 ⁄ 4 (349) 53 ⁄ 8 (137) 25 (11.3)

L1130V LMB0410D-1130V-Y 71 ⁄ 2 (191) 61 ⁄ 8 (156) 3 (76) 35 ⁄ 16 (84) 51 ⁄ 2 (140) 61 ⁄ 2 (165) 6 (152) 61 ⁄ 8 (156) 19 (483) 141 ⁄ 8 (359) 53 ⁄ 8 (137) 24 (10.9)

L1034V LMB0410D-1034V-Y 71 ⁄ 2 (191) 63 ⁄ 8 (162) 3 (76) 37 ⁄ 8 (98) 6 (152) 61 ⁄ 2 (165) 6 (152) 61 ⁄ 8 (156) 19 (483) 143 ⁄ 8 (365) 515 ⁄ 16 (151) 25 (11.3)

L0609D

L0609V LMB0609D-0609V-Y 55 ⁄ 8 (143) 4 (102) 33 ⁄ 16 (81) 215 ⁄ 16 (75) 5 (127) 63 ⁄ 8 (162) 6 (152) 61 ⁄ 8 (156) 187 ⁄ 8 (479) 12 (305) 5 (127) 21 (9.5 )

L0710V LMB0609D-0710V-Y 57 ⁄ 8 (149) 41 ⁄ 2 (114) 33 ⁄ 16 (81) 215 ⁄ 16 (75) 5 (127) 63 ⁄ 8 (162) 6 (152) 61 ⁄ 8 (156) 187 ⁄ 8 (479) 121 ⁄ 2 (318) 5 (127) 22 (10.0)

L0515V LMB0609D-0515V-Y 515 ⁄ 16 (151) 41 ⁄ 2 (114) 33 ⁄ 16 (81) 215 ⁄ 16 (75) 5 (127) 63 ⁄ 8 (162) 6 (152) 61 ⁄ 8 (156) 187 ⁄ 8 (479) 121 ⁄ 2 (318) 5 (127) 22 (10.0)

L1111V LMB0609D-1111V-Y 71 ⁄ 4 (184 ) 55 ⁄ 16 (135) 33 ⁄ 16 (81) 35 ⁄ 16 (84) 53 ⁄ 8 (137) 63 ⁄ 8 (162) 6 (152) 61 ⁄ 8 (156) 187 ⁄ 8 (479) 135 ⁄ 16 (338) 53 ⁄ 8 (137) 23 (10.4)

L0435V LMB0609D-0435V-Y 7 (178) 511 ⁄ 16 (144) 33 ⁄ 16 (81) 33 ⁄ 8 (86) 51 ⁄ 2 (140) 63 ⁄ 8 (162) 6 (152) 61 ⁄ 8 (156) 187 ⁄ 8 (479) 1311 ⁄ 16 (348) 57 ⁄ 16 (138) 23 (10.4)

L1121V LMB0609D-1121V-Y 71 ⁄ 4 (184) 53 ⁄ 4 (146) 31 ⁄ 4 (83) 35 ⁄ 16 (84) 51 ⁄ 2 (140) 61 ⁄ 2 (165) 6 (152) 61 ⁄ 8 (156) 19 (483) 133 ⁄ 4 (349) 53 ⁄ 8 (137) 26 (11.8)

L1130V LMB0609D-1130V-Y 71 ⁄ 2 (191) 61 ⁄ 8 (156) 3 (76) 35 ⁄ 16 (84) 51 ⁄ 2 (140) 61 ⁄ 2 (165) 6 (152) 61 ⁄ 8 (156) 19 (483) 141 ⁄ 8 (359) 53 ⁄ 8 (137) 25 (11.3)

L1034V LMB0609D-1034V-Y 71 ⁄ 2 (191) 63 ⁄ 8 (162) 3 (76) 37 ⁄ 8 (98) 6 (152) 61 ⁄ 2 (165) 6 (152) 61 ⁄ 8 (156) 19 (483) 143 ⁄ 8 (365) 515 ⁄ 16 (151) 26 (11.8)

L0710D

L0710V LMB0710D-0710V-Y 57 ⁄ 8 (149) 41 ⁄ 2 (114) 33 ⁄ 16 (81) 215 ⁄ 16 (75) 5 (127) 63 ⁄ 8 (162) 6 (152) 61 ⁄ 8 (156) 187 ⁄ 8 (479) 121 ⁄ 2 (318) 5 (127) 23 (10.4)

L0515V LMB0710D-0515V-Y 515 ⁄ 16 (151) 41 ⁄ 2 (114) 33 ⁄ 16 (81) 215 ⁄ 16 (75) 5 (127) 63 ⁄ 8 (162) 6 (152) 61 ⁄ 8 (156) 187 ⁄ 8 (479) 121 ⁄ 2 (318) 5 (127) 23 (10.4)

L1111V LMB0710D-1111V-Y 71 ⁄ 4 (184 ) 55 ⁄ 16 (135) 33 ⁄ 16 (81) 35 ⁄ 16 (84) 53 ⁄ 8 (137) 63 ⁄ 8 (162) 6 (152) 61 ⁄ 8 (156) 187 ⁄ 8 (479) 135 ⁄ 16 (338) 53 ⁄ 8 (137) 24 (10.9)

L0435V LMB0710D-0435V-Y 7 (178) 511 ⁄ 16 (144) 33 ⁄ 16 (81) 33 ⁄ 8 (86) 51 ⁄ 2 (140) 63 ⁄ 8 (162) 6 (152) 61 ⁄ 8 (156) 187 ⁄ 8 (479) 1311 ⁄ 16 (348) 57 ⁄ 16 (138) 24 (10.9)

L1121V LMB0710D-1121V-Y 71 ⁄ 4 (184) 53 ⁄ 4 (146) 31 ⁄ 4 (83) 35 ⁄ 16 (84) 51 ⁄ 2 (140) 61 ⁄ 2 (165) 6 (152) 61 ⁄ 8 (156) 19 (483) 133 ⁄ 4 (349) 53 ⁄ 8 (137) 27 (12.2)

L1130V LMB0710D-1130V-Y 71 ⁄ 2 (191) 61 ⁄ 8 (156) 3 (76) 35 ⁄ 16 (84) 51 ⁄ 2 (140) 61 ⁄ 2 (165) 6 (152) 61 ⁄ 8 (156) 19 (483) 141 ⁄ 8 (359) 53 ⁄ 8 (137) 26 (11.8)

L1034V LMB0710D-1034V-Y 71 ⁄ 2 (191) 63 ⁄ 8 (162) 3 (76) 37 ⁄ 8 (98) 6 (152) 61 ⁄ 2 (165) 6 (152) 61 ⁄ 8 (156) 19 (483) 143 ⁄ 8 (365) 515 ⁄ 16 (151) 27 (12.2)

L0515D

L0515V LMB0515D-0515V-Y 515 ⁄ 16 (151) 41 ⁄ 2 (114) 33 ⁄ 16 (81) 215 ⁄ 16 (75) 5 (127) 63 ⁄ 8 (162) 6 (152) 61 ⁄ 8 (156) 187 ⁄ 8 (479) 121 ⁄ 2 (318) 5 (127) 23 (10.4)

L1111V LMB0515D-1111V-Y 71 ⁄ 4 (184 ) 55 ⁄ 16 (135) 33 ⁄ 16 (81) 35 ⁄ 16 (84) 53 ⁄ 8 (137) 63 ⁄ 8 (162) 6 (152) 61 ⁄ 8 (156) 187 ⁄ 8 (479) 135 ⁄ 16 (338) 53 ⁄ 8 (137) 24 (10.9)

L0435V LMB0515D-0435V-Y 7 (178) 511 ⁄ 16 (144) 33 ⁄ 16 (81) 33 ⁄ 8 (86) 51 ⁄ 2 (140) 63 ⁄ 8 (162) 6 (152) 61 ⁄ 8 (156) 187 ⁄ 8 (479) 1311 ⁄ 16 (348) 57 ⁄ 16 (138) 24 (10.9)

L1121V LMB0515D-1121V-Y 71 ⁄ 4 (184) 53 ⁄ 4 (146) 31 ⁄ 4 (83) 35 ⁄ 16 (84) 51 ⁄ 2 (140) 61 ⁄ 2 (165) 6 (152) 61 ⁄ 8 (156) 19 (483) 133 ⁄ 4 (349) 53 ⁄ 8 (137) 27 (12.2)

L1130V LMB0515D-1130V-Y 71 ⁄ 2 (191) 61 ⁄ 8 (156) 3 (76) 35 ⁄ 16 (84) 51 ⁄ 2 (140) 61 ⁄ 2 (165) 6 (152) 61 ⁄ 8 (156) 19 (483) 141 ⁄ 8 (359) 53 ⁄ 8 (137) 26 (11.8)

L1034V LMB0515D-1034V-Y 71 ⁄ 2 (191) 63 ⁄ 8 (162) 3 (76) 37 ⁄ 8 (98) 6 (152) 61 ⁄ 2 (165) 6 (152) 61 ⁄ 8 (156) 19 (483) 143 ⁄ 8 (365) 515 ⁄ 16 (151) 27 (12.2)

L1111D

L1111V LMB1111D-1111V-Y 71 ⁄ 4 (184 ) 55 ⁄ 16 (135) 33 ⁄ 16 (81) 35 ⁄ 16 (84) 53 ⁄ 8 (137) 63 ⁄ 8 (162) 6 (152) 61 ⁄ 8 (156) 187 ⁄ 8 (479) 135 ⁄ 16 (338) 53 ⁄ 8 (137) 25 (11.3)

L0435V LMB1111D-0435V-Y 7 (178) 511 ⁄ 16 (144) 33 ⁄ 16 (81) 33 ⁄ 8 (86) 51 ⁄ 2 (140) 63 ⁄ 8 (162) 6 (152) 61 ⁄ 8 (156) 187 ⁄ 8 (479) 1311 ⁄ 16 (348) 57 ⁄ 16 (138) 25 (11.3)

L1121V LMB1111D-1121V-Y 71 ⁄ 4 (184) 53 ⁄ 4 (146) 31 ⁄ 4 (83) 35 ⁄ 16 (84) 51 ⁄ 2 (140) 61 ⁄ 2 (165) 6 (152) 61 ⁄ 8 (156) 19 (483) 133 ⁄ 4 (349) 53 ⁄ 8 (137) 28 (12.7)

L1130V LMB1111D-1130V-Y 71 ⁄ 2 (191) 61 ⁄ 8 (156) 3 (76) 35 ⁄ 16 (84) 51 ⁄ 2 (140) 61 ⁄ 2 (165) 6 (152) 61 ⁄ 8 (156) 19 (483) 141 ⁄ 8 (359) 53 ⁄ 8 (137) 27 (12.2)

L1034V LMB1111D-1034V-Y 71 ⁄ 2 (191) 63 ⁄ 8 (162) 3 (76) 37 ⁄ 8 (98) 6 (152) 61 ⁄ 2 (165) 6 (152) 61 ⁄ 8 (156) 19 (483) 143 ⁄ 8 (365) 515 ⁄ 16 (151) 28 (12.7)

L0435D

L0435V LMB0435D-0435V-Y 7 (178) 511 ⁄ 16 (144) 33 ⁄ 16 (81) 33 ⁄ 8 (86) 51 ⁄ 2 (140) 63 ⁄ 8 (162) 6 (152) 61 ⁄ 8 (156) 187 ⁄ 8 (479) 1311 ⁄ 16 (348) 57 ⁄ 16 (138) 24 (10.9)

L1121V LMB0435D-1121V-Y 71 ⁄ 4 (184) 53 ⁄ 4 (146) 31 ⁄ 4 (83) 35 ⁄ 16 (84) 51 ⁄ 2 (140) 61 ⁄ 2 (165) 6 (152) 61 ⁄ 8 (156) 19 (483) 133 ⁄ 4 (349) 53 ⁄ 8 (137) 28 (12.7)

L1130V LMB0435D-1130V-Y 71 ⁄ 2 (191) 61 ⁄ 8 (156) 3 (76) 35 ⁄ 16 (84) 51 ⁄ 2 (140) 61 ⁄ 2 (165) 6 (152) 61 ⁄ 8 (156) 19 (483) 141 ⁄ 8 (359) 53 ⁄ 8 (137) 27 (12.2)

L1034V LMB0435D-1034V-Y 71 ⁄ 2 (191) 63 ⁄ 8 (162) 3 (76) 37 ⁄ 8 (98) 6 (152) 61 ⁄ 2 (165) 6 (152) 61 ⁄ 8 (156) 19 (483) 143 ⁄ 8 (365) 515 ⁄ 16 (151) 27 (12.2)

L1121D

L1121V LMB1121D-1121V-Y 71 ⁄ 4 (184) 53 ⁄ 4 (146) 31 ⁄ 4 (83) 35 ⁄ 16 (84) 51 ⁄ 2 (140) 61 ⁄ 2 (165) 6 (152) 61 ⁄ 8 (156) 191 ⁄ 8 (486) 133 ⁄ 4 (349) 53 ⁄ 8 (137) 31 (14.1)

L1130V LMB1121D-1130V-Y 71 ⁄ 2 (191) 61 ⁄ 8 (156) 3 (76) 35 ⁄ 16 (84) 51 ⁄ 2 (140) 61 ⁄ 2 (165) 6 (152) 61 ⁄ 8 (156) 191 ⁄ 8 (486) 141 ⁄ 8 (359) 53 ⁄ 8 (137) 30 (13.6)

L1034V LMB1121D-1034V-Y 71 ⁄ 2 (191) 63 ⁄ 8 (162) 3 (76) 37 ⁄ 8 (98) 6 (152) 61 ⁄ 2 (165) 6 (152) 61 ⁄ 8 (156) 191 ⁄ 8 (486) 143 ⁄ 8 (365) 515 ⁄ 16 (151) 31 (14.1)

L1130DL1130V LMB1130D-1130V-Y 71 ⁄ 2 (191) 61 ⁄ 8 (156) 3 (76) 35 ⁄ 16 (84) 51 ⁄ 2 (140) 61 ⁄ 2 (165) 6 (152) 61 ⁄ 8 (156) 191 ⁄ 8 (486) 141 ⁄ 8 (359) 53 ⁄ 8 (137) 29 (13.2)

L1034V LMB1130D-1034V-Y 71 ⁄ 2 (191) 63 ⁄ 8 (162) 3 (76) 37 ⁄ 8 (98) 6 (152) 61 ⁄ 2 (165) 6 (152) 61 ⁄ 8 (156) 191 ⁄ 8 (486) 143 ⁄ 8 (365) 515 ⁄ 16 (151) 30 (13.6)

L1034D L1034V LMB1034D-1034V-Y 71 ⁄ 2 (191) 63 ⁄ 8 (162) 3 (76) 37 ⁄ 8 (98) 6 (152) 61 ⁄ 2 (165) 6 (152) 61 ⁄ 8 (156) 191 ⁄ 8 (486) 143 ⁄ 8 (365) 515 ⁄ 16 (151) 30 (13.6)

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Performance Data — 60 Hz

FLOW-GPM

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44

T O T A L H E A D - F E E T

0

2

4

6

8

10

12

14

16

18

20

22

24

26

28

30

32

34

FLOW-M3/H

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 10.5

T

O T A L H E A D - M E T E R S

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

6.5

7.0

7.5

8.0

8.5

9.0

9.5

10.0

L0410F

L0609L0710

L0515F

L0435

L1130

L1034

L1121

D

A

B

A

B

C

D

E

F

C

H

E

F

LOADMATCH® CIRCULATOR MODELS (For LMB) 60h z

G

G H

Page 24

7/27/2019 100-85


Performance Data — 50 Hz

FLOW-GPM

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30

T O T A L H E A D - F E E T

0

2

4

6

8

10

12

14

16

18

20

22

24

FLOW-M3/H

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5

T O T A L H E A D - M E T E R S

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

6.5

7.0

L0410F

L0609

L0710

L0515F

L0435

L1130

L1034

L1121

A

B

C

D

E

F

LOADMATCH® CIRCULATOR MODELS (For LMB) 50hz

G

H

A

B

C

D

E

H

F

G

Page 25

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Page 26

Mechanical Specifications

SECTION 15182LOFLO HYDRONICDISTRIBUTION SYSTEMS

PART 1 GENERAL

1.1 WORK INCLUDED

A. This Section governs the mate-

rials and installation o closed

hydronic systems associated with

building heating and cooling. The

ollowing systems, where applica-

ble, shall be installed as speciied

herein.

1. Hot Water Heating System

2. Chilled Water Cooling System

3. Dual Temperature Water System

4. Heat Pump Circulating System

5. Closed Circuit Cooling Tower System

6. Run-Around HeatRecovery System

1.2 EQUIPMENT SUBSTITUTION

A. All items eligible or substitution

require submission o request or

substitution 10 days prior to bid

date. This submittal shall include

speciic models and capacities o

equipment and not just manuac-

turer’s literature. The prior approval

request package shall also include

an engineered low schematic

showing that the manuacturer

has a detailed understanding o

the temperature cascade. This

schematic shall be sealed by a pro-

essional engineer. This schematic

shall show the entering and leav-

ing temperature, load, and low

at every terminal unit. In addition

the prior approval package shall

include an owner contact list or

50 single pipe distribution jobs

this manuacturer has successully

installed over the last ive years.

A system perormance guaranteeshall also be provided along with

manuacturer’s liability policy cover

page. This entire package must be

received 10 days prior to bid. Only

written approval issued via adden-

dum will be notiication o vendor

approval. No verbal approvals will

be acknowledged.

1.3 TESTING & APPROVING AGENCIES

A. Where items o equipment

are required to be provided with

compliance to U.L., A.G.A., or other

testing and approving agencies, the

contractor may submit a written

certiication rom any nationally rec-

ognized testing agency, adequately

equipped and competent to per-

orm such services, that the item

o equipment has been tested and

conorms to the same method o

test as the listed agency would

conduct.

1.4 SUBMITTAL DATA

A. See Section 01300 or general

submittal requirements.

B. Provide manuacturer’s litera-

ture or all products speciied in

this Section, which will be installed

under this project.

C. Provide perormance curves or

all pumps. Plot the speciied oper-

ating point or each pump on its

respective curve.

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Page 27


D. Provide complete literature

or all components o packaged

systems. These include pump per-

ormance, heat exchanger calcula-

tions, expansion tank capacity, data

or all accessories and valves and

complete wiring diagrams speciic

to the exact unit to be supplied.

The wiring diagram shall indicate all

required ield and actory wiring.

E. The submittal package shall

include the engineered low sche-

matic as described in the substitu-

tion section.

PART 2 - PRODUCTS

2.1 SYSTEM

1. The LOFlo distribution systemshall include LOFlo Mixing Blocks

with circulators, twin tees, design

suite o sotware, and system guar-

antee. The manuacturer shall pro-

vide a complete system including

LOFlo Mixing Block with circulators,

twin tees, primary pumps, system

air control, expansion components,

heat exchangers, design suite o

sotware and system guarantee. The

manuacturer shall have a minimum

o 50 single pipe distribution jobs

installed within the last ive years

B. LOFlo Mixing Block.

1. The LOFLo Mixing Block shall

consist o an injection circulator

and a zone circulator with an inter-

connecting decoupler pipe with

connections to the primary and

zone circuits. The interconnecting

decoupler piping shall be stainless

steel with langed connections or

ield servicing and removal o the

circulators. Circulators and inter-

connecting decoupler shall be ac-

tory assembled as one unit.

2. The injection circulator shall be

operated at variable speed to con-

trol the supply water temperature

to the terminal unit or the zone.

3. The zone circulator shall be

operated either constant or variable

speed to maintain the space tem-

perature in the zone.

C. LoadMatch® Circulator.

1. Circulators shall be Taco Model

LoadMatch® circulator or approved

equal.

2. The circulator shall be water

lubricated, direct drive, requiring no

seals, couplers or bearing assembly.

Ceramic shat and carbon bearing

construction shall be capable o

running without luid or 10 days

without damage to shat or bear-

ings.

3. The circulator shall be repair-

able in-line without removal o the

circulator rom the piping using a

stainless steel replaceable cartridge.

Circulator shall be provided with a 3year warranty.

4. The circulator shall incorporate

a removable integral spring loaded

low check to eliminate luid circula-

tion when the pump is o.

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Page 28


5. The circulator shall incorporate

an integral condensate bale to

eliminate condensation on the

motor housing when supplying

chilled water down to 20°F.

Alternative manuacturing pro-

cesses that delay the eect o con-

densation versus preventing it shall

not be allowed. Speciically extra

coating on the windings is not

acceptable.

6. Circulator shall be rated or 200

psi working pressure at 220°F luid

temperature

7. An integral variable speed drive

(VSD) shall accept a 0-10 Vdc or4-20 mA modulating control signal

to control the speed o the circula-

tor motor. VSD shall incorporate an

exercise sequence to run the pump

or 20 seconds i there has been no

run signal or 72 hours.

8. Circulator shall bear UL label.

9. The manuacturer shall guaran-

tee system operation or one ull

heating season and one ull cooling

season, to the extent that the HVAC

system shall deliver the heating

and cooling capacities as speciied.

The value o the guarantee shall be

equal to the value o retroitting the

system to a two-pipe system.

D. Twin Tee

1. Tee ittings or terminal unit tie

in to system distribution piping

shall be Taco Twin Tee.

2. Twin Tee ittings shall be made

o ductile iron or bronze and shall

be rated or 200 psi.

3. The itting shall be manuac-

tured with two system connections

and two terminal unit connections.

The system connections shall be

oered in three types: sweat, thread-

ed, and grooved. Terminal unit con-

nections shall all be threaded.

4. The itting shall include an

internal bale that prevents short

circuiting o the terminal unit luid

rom inlet to outlet.

E. Design software for temperature cascade

1. Manuacturer shall provide, as

part o the system, a sotware pack-

age that allows the constructionteam to design, document, and

manage the temperature cascade

in a single pipe distribution system.

This sotware shall produce a low

diagram that sizes all equipment

and pipe based on inputted loads

and temperature dierentials. The

sotware shall document all o

these design calculations in a low

schematic. The low schematic

shall show all loads, entering and

leaving temperatures, and low or

each terminal unit. In the case o

dual temperature systems and heat

pumps, it shall document data or

both heating and cooling modes.

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F. System Guarantee

1. The manuacturer shall provide

a written letter o guarantee certiy-

ing the perormance o the entire

system. This includes but is not lim-

ited to terminal unit perormance.

PART 3 - EXECUTION

3.1 PUMPS

A. General

1. All pumps, other than circulators,

shall be itted with a multi-purpose

or balancing valve or other means

o providing system balance.

2. All pumps shall be itted with

instrument test port on inlet and

outlet ports unless otherwise indi-

cated.

3. All pump groups (over one

pump in parallel) on a single system

shall utilize a check valve on the

outlet to prevent reverse low.

B. Circulator

1. Circulator shall be mounted with

motor shat in the horizontal posi-

tion.

2. Start-Up

a. The primary loop shall be

purged o air with the LOFlo sec-

ondary terminal loop shuto valves

closed.

b. The primary loop shall be

cleaned o debris by starting the

primary pumps and continuously

circulating water in the primary

loop. The system shall be cleaned

by requently cleaning the start-up

screens in the primary pump suc-

tion diusers until the screens donot collect any more debris.

c. Once the suction diuser start-

up screens are clean then the shut-

o valves to the LOFlo secondary

terminal loops can be opened.

d. The secondary terminal loops

shall be purged o air by opening

the manual air vents on the termi-

nal units.

e. When the secondary terminal

unit piping is purged o air then the

LOFlo Mixing Block circulators can

be started.

END OF SECTION 15182

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Page 30

Frequently Asked Questions

What exactly is the

LOFloTM Mixing Block?

The LOFlo TM Mixing Block (LMB)

is a unique Taco innovation that

is comprised o a 4-connection

hydraulic separator maniold

incorporating two circulators that

provide variable temperatures o

water to a secondary loop when

connected to a single-temperature

primary loop. It is a complete

injection mixing station in a com-

pact, actory-assembled package.

How does it work?

One o the circulators provides

a constant low out o and back

into the primary loop. The second

circulator, a variable speed, acts asan injection pump to mix primary

water with return water, precisely

maintaining the desired tempera-

ture to terminal units. This close

water temperature control results in

very close space condition control.

What makes LOFlo® unique?

Small LoadMatch® circulators allow

primary pumps to be smaller,

lowering power consumption. In

addition, the circulators contain

anti-condensate bales, making

them suitable or both heating and

cooling applications. All LMB com-

ponents are actory assembled and

utilize common, 2-bolt langed con-

nections or both the circulators and

or connections to the primary loop.

The maniold is stainless steel and

acts as a hydraulic separator in order

to insure proper mixing and precise

temperature control. The circulators

deliver the needed secondary low

without eecting low or pressure

drops in the primary loop.

What does it replace in a

conventional system? The LMB eliminates the need or

mixing (balancing) valves, bypass

control valves, and check valves in

the secondary loop. The LMB injec-

tion system controls the loop tem-

perature through its variable speed

circulator. In addition, each circula-

tor contains a built-in low check

to prevent “ghost” lows and, when

used with the Taco Twin-Tee®, there

is no need or two close-coupled T’s

in each secondary circuit.

Do I need to change my system

piping to accommodate the

LMB?

Since a single primary water tem-

perature is used or both heating and

cooling (such as in chilled beams,

radiant panels, variable air volume,

and air handling units), the LMB can

actually reduce the number o pipes

in some systems rom 8 to 2!

Perhaps more importantly, the LMB

allows the use o higher delta ΔT’s,

resulting in lower primary lows and

allowing the use o smaller pipe. This

can reduce low rates by up to 75%!

The elimination o balancing andcontrol valves reduces the pressure

drop and resulting pump heads and

horsepower.

The use o the Taco Twin-Tee® or

connection to the secondary loops

will also reduce the number o Teesrequired simpliying the piping sys-

tem and reducing installation labor

and the potential or uture leaks.

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Does it cost more than thecomponents it replaces?

The LMB costs slightly m ore than

the valves and accessories that

it replaces in the secondary loop

circuit. However, the savings in

primary system piping cost, installa-

tion labor, balancing expense, and

energy savings make it a highly cost

eective addition to any o today’smodern space conditioning sys-

tems.

Taco’s Design Suite sotware can

easily demonstrate both the mate-

rial and energy cost savings when

using the LOFlo TM Mixing Block in

conjunction with a LoadMatch®,

Radiant, or Chilled Beam commer-

cial system.

Does it control flow accurately?

Accurate low in the secondary (ter-

minal) loop is assured through the

selection o the LoadMatch® circula-

tors included on the mixing block.

With more than 90 possible com-

binations available, the LMB can be

selected to meet almost any looprequirement. And since the LMB is

in act a pumping station, low to

the secondary loop is independent

o conditions in the primary loop

and guaranteed. In act, this is one

o the most desirable characteristics

o the LOFlo® Mixing Block.

Is it considered a

“Green” product?

The LOFlo® Mix ing Block is a com-ponent that is used as part o a

“Green” heating and air condition-

ing system. It can save as much

as 50% o the piping costs, 50% o

the pumping horsepower, reduce

maintenance costs, improve system

reliability, and deliver precise water

temperatures or enhanced space

comort. All o these characteris-

tics make the LMB a valuable tool

in achieving the highest degree o

“Green” possible in today’s innova-

tive commercial building designs.

Does it qualify for LEED points?

LEED points have been earned

on projects using the LMB. The

elimination o two or our pipes in

primary loops has garnered 1 LEEDpoint based on material reduction

alone. In addition, the reduction in

pump heads and low rates o the

primary loops can lead to pump

horsepower reductions that have

resulted in additional LEED points.

Taco will provide the needed sup-

port and calculations to assist in

obtaining LEED credits on projects

using the LMB.

What is its warranty?

Each Taco circulator carries a three-

year lange-to-lange warranty.

Unlike most control valves, these

wet-rotor circulators contain no

seals to leak and require no adjust-

ments. And should one ail in use,

it is easily repaired due to its unique

replaceable cartridge design. Allmoving parts are contained in a

single assembly that does not

require the circulator to be

removed rom the LMB in

order eect a change.

How do you balance flow

at the LMB?

The LMB completely e liminates the

need or lengthy and expensive

system balancing since it will always

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provide the required low. Since the

circulators are selected indepen-

dently rom the primary loop, and

since they are sized to overcome

the loop head, they will always pro-

vide the required low and they will

do so while providing the required

temperature. In eect, each sec-

ondary circuit is decoupled rom

the primary loop.

How long has it been

in the market?

Taco has been producing small wet

rotor circulators or more than 50

years and has been m anuactur-

ing LoadMatch® style circulators or

over 10 years. These pumps have

demonstrated the highest reliability

in hundreds o projects all over the

world. The packaged injection mix-

ing block LMB maniold has been

available or more than 7 years and

it has clearly established its reliabil-

ity in many projects.

How is it controlled?

The variable speed circulators used

on the LMB can be controlled in avariety o ways. They can be provid-

ed with a built-in delta ΔT controller

that will maintain a set temperature

drop between 5˚ and 50˚ across the

terminal unit. A simple supply and

return sensor connected to the pip-

ing is all that is required or precise

control.

In addition, any type o controller that

can supply a variable DC or Millivolt

signal can be used to control the unit.

Taco can also provide our LOFlo®

Mixing Controller. and all circulators

are UL approved, use-protected, and

contain a snap-in PC board.

What are its maintenance

requirements? There are no maintenance

requirements with the LOFlo®

Mixing Block.

©Taco Catalog #100-85 Eective Date: 12-17-12Supersedes: 02/10/11 Printed in USA

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100-85