PMI-IF-H High Efficiency Gas Heat Units

Mechanical

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High Efficiency Gas Fired Make-Up Air UnitsPrice’s new line of high efficiency indirect fired gas heating products are designed to meet the goals of all good building designs by reducing operating costs and minimizing environmental impact.

The Challenge

Design Conditions Btu/h-cfmCooling Work Heating Work

Watts/cfm Btu/h-cfm

Std Unit80/67 to 57.6/57F 30 3.0

-1.5 to 70F (20% OA) 16 19

MUA Unit90/75 to 55/54.5F 70 7.0

-1.5 to 70F 78 97

Almost all building heating systems are based on burning natural gas. Typically, the most energy intense

unit in the HVAC system is the make-up air unit (see Table 1) which uses as much as five times the

natural gas of a standard unit. While plentiful, the cost of natural gas is rising. Even though natural gas

burns twice as clean as coal and other fossil fuels, it still contributes to climate change through CO2

emissions. The challenge is to improve the gas heating efficiency which will reduce operating costs and

climate change impact.

The SolutionPrice’s new line of high efficiency indirect fired

units can help reduce operating costs by 11%

with a less than two year payback. Traditional gas

heat units are only 80% efficient, meaning 20%

of the available heat in the natural gas is going

up the vent stack. The stack temperature on a

traditional unit can be over 500°F – that’s heat

that’s not available for the building and higher CO2

emissions that lead to climate change. The Price

line of high efficiency units have an impressive

stack temperature of only 100°F, and they are 90%

efficient so almost all of the heat released during

combustion is used in the building.

Typical Make-Up Air System

Table 1

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PMI-IF-H High Efficiency Units

At the heart of the high efficiency unit is the new

indirect fired convoluted tube furnace. The furnace

includes a specially designed heat exchanger to

squeeze as much of the heat from combustion as

possible and transfer it to the supply air stream.

The furnace is constructed from stainless steel

and other corrosion-resistant materials to provide

reliability and longevity.

Indirect Fired Design

The furnace is indirect fired, meaning no products

of combustion enter the supply air. This helps

maintain good indoor air quality. The burners are

modulating which also allows for great temperature

control and comfort.

The 90% furnace can be used in Price’s custom

rooftop unit platform, allowing almost any

configuration of components and variable

geometry. Single and dual path energy recovery is

also available (see unit configuration). Up to four

furnaces can be used in a 2 by 2 arrangement

providing up to 1440 kBtu/h of capacity.

High Efficiency Indirect Fired Furnace

Indirect Fired Design

Model Input Btu Output Btu Turndown

PMI-IF-11-150H 150,000 135,000 5:1

PMI-IF-11-200H 200,000 180,000 5:1

PMI-IF-11-300H 300,000 270,000 5:1

PMI-IF-11-400H 400,000 360,000 5:1

PMI-IF-12-400H 400,000 360,000 10:1

PMI-IF-12-500H 500,000 450,000 10:1

PMI-IF-12-600H 600,000 540,000 10:1

PMI-IF-12-800H 800,000 720,000 10:1

PMI-IF-22-1000H 1,000,000 900,000 10:1

PMI-IF-22-1200H 1,200,000 1,080,000 10:1

PMI-IF-22-1400H 1,400,000 1,260,000 10:1

PMI-IF-22-1600H 1,600,000 1,440,000 10:1

Available High Efficiency Models

Mechanical

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Unit Configuration

The following components can be configured in almost any arrangement to meet your building requirements.

100% Outdoor Air Hood Mixing Box

Economizer (plan view) Economizer w/RF Fan (plan view)

2" Angular Fitlers

Fixed Face & Bypass Cooling Coil

12" Cartridge Filters

Full Cooling Coil (Water or integral DX)

Fixed Face & Bypass Cooling Coil

Hot Gas Reheat

Access Section Humidifier Silencer

Scrolled FC and AF Fans

DD and RD Plenum Fans

Fan Arrays

90% Efficiency Furnace

Discharge Plenums

Top Mounted DX End Mounted DX

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Unit Configuration

The following components can be configured in almost any arrangement to meet your building requirements. Condensate Management

Applying the Price high efficiency furnace is

no different than any other gas heat product

except for condensate. As the high efficiency

furnace extracts the heat, the water vapor in

the combustion gas starts to condense. This

also happens with other high efficiency gas heat

products such as home furnaces and condensing

boilers.

If the equipment is roof mounted in a climate

where freezing conditions may occur, the

management of the condensate is critical. Price

recommends a drain inside the building under the

unit. The condensate can be routed down through

the curb to the drain. If the application requires the

condensate drain line to be exposed to freezing

conditions, field-supplied heat tracing is required.

Price offers an optional neutralizing kit to raise the

PH of the condensate where local codes require

it. The kits can be factory mounted in the unit or

shipped loose for field installation.

Condensate Chase

Neutralizing Kit

Mechanical

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· Custom configurations · 1 or 2” foam or fiberglass construction · Galv, painted or SS · Liners · Washdown liners · Engineered and structural

Air and Water Cooled Integral DX Cooling · 3 to 60 tons · Standard and high efficiency · Top or end mounted

Supply and Return Fans · Direct and belt drive plenum fans · Fan arrays

Filter Options · Pre and final filters · MERV 8 to 14 · Cartridge filters

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90% Efficient Indirect Fired Furnace · 150 to 1,600 kBtu/h input

Controls · Factory installed and tested controls · BACnet compatible

Other Options · Energy recovery

· Humidification

· Silencers

· Chilled water cooling

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Product Improvement is a continuing endeavour at Price. Therefore, specifications are subject to change without notice.

Consult your Price Sales Representative for current specifications or more detailed information. Not all products may be

available in all geographic areas. All goods described in this brochure are warranted as described in the Limited Warranty

shown at priceindustries.com. The complete Price product catalog can be viewed online at priceindustries.com.

® Price is a registered trademark of Price Industries Limited. © 2015. Printed in Canada 2015 | v300

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CANADA

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UNITED STATES

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