7/27/2019 FanCoils Overview
1/6F1-24All Metric dimensions ( ) are soft conversion. Copyright Price Industries Limited 2011.Imperial dimensions are converted to metric and rounded to the nearest millimetre.
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Benefts o Using Fan Coil Units
Fan coils have been in use or decades as ameans o providing heating and cooling toindividual zones. The major advantages ousing an coil units are that they allow orlocal control o individual zones, reduce theamount o cross-contamination betweenzones and allow or hydronic heating andcooling.
Hydronic systems are ar more ecientthan all air systems because water pipingtakes up a raction o the space o ductwork.Fan coils can be selected to handle a zone'ssensible cooling load, signicantly reducingthe air fow requirements o the main air
handler needed or ventilation and latentloads only. This air fow reduction results ina smaller HVAC system which translates intoenergy savings. A smaller HVAC ootprintand duct system can also reduce foorheights or increase leasable space. Duringunoccupied hours the primary air systemcan be shut o to save energy while the ancoils maintain space temperature.
Construction
Compactunits reducedthefootprintof
the HVAC system and increase leasable
space
Heavydutyzinc-coatedsteelcasings
Unit casing's are internally lined with
dual density berglass insulation. The
insulation's high density skin provideserosion resistance while eectively
attenuating noise. Insulation meets
requirements o UL181 and NFPA-90A.
Several liner types are available to
address the issue o exposed berglass.
Removable access panels provide
access to the interior o the unit or
cleaning, inspection and service.
Three speed PSC motors allow for
reduced energy consumption
Perormance
Unit performance is AHRI certied
providing reassurance that design goals
will be met
Cataloged sound performance data isthe result o Price laboratory testing
done in accordance with industry test
standards.
Controls
Priceoffersavarietyof controloptions
to suit each application. Digital controls
are all actory calibrated, mounted and
wired to provide cost eective design
solutions
Quality Assurance
EachPriceFanCoil unit receives a full
operational check beore shipment and
arrives actory congured in accordance
with project specications. This means
costly labor and setup delays are
avoided.
UnitsareETLlistedtomeetUL1995and
CSA No. 236.
Outdoor Air
Relief Air
Zone 1
CLASSROOM
Zone 2
CLASSROOM
AHU
F
an
Coil
Unit
F
an
Coil
Unit
T T
Fan Coil Unit
Typical Fan Coil Layout
Overview
Fan Coils
Product Key
FC XX
Configuration
H - HorizontalV - Vertical
Model
C - ConcealedE - Exposed
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Copyright Price Industries Limited 2011. All Metric dimensions ( ) are soft conversion .Imperial dimensions are converted to metric and rounded to the nearest millimetre. F1-25
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Water Coil Selection Guide
Fan Coils
Fan Coils are typically sized to handle theheating or cooling load or an individualroom or zone. This load may be purelysensible or may have a latent portion. Therequired load should be calculated based onthe room occupancy, geographical locationand building construction.
Once the load is known, the entering airand water conditions or the coil must bedened. The entering air conditions will bebased on the space and the entering watertemperature will be based on the chiller.
To determine the approximate air fow othe required unit and thereore the unitsize, the rule o thumb o 375 cm / Ton orequired cooling (1Ton = 12000 BTHU/h) canbe used. This rule gives a starting point orselecting a an coil unit size. Units shouldbe selected near the midpoint o their fowrange. This will ensure that there is adequatean volume capacity or turn down i actualinstall system pressures are slightly higheror lower than the anticipated design. Thiswill also help lower the noise generated bythe an and allow or uture changes to thesystem. Selecting near the extremes o theoperating range should be avoided.
Next, the method o calculating coilperormance must be deined. Mostan coils are selected based on a 10 or12F temperature rise (based on chillerrequirements) but a set water fow rate(based on pump requirements) or a setleaving air temperature (or displacementventilation) may also be used.
Once all o these variables have beendetermined, the Price Fan Coil selectiontool can be used to calculate exact an coilperormance ratings. The number o coilrows and circuits can be adjusted to achievethe required capacity but there are pros andcons to changing each variable as shownbelow.
The air fow o the unit may also be adjustedto achieve the required capacity but careshould be taken when increasing the aifow o the unit as the generated noise andenergy use will also increase. Increasing theair fow will also aect the air distributionsystem and could lead to uncomortabledrats in the occupied space. In all cases, thevelocity across the coil should not exceed550 Feet per minute or condensate maycarry over rom the coil into the downstreamductwork. I a higher air fow is necessaryto meet the required capacity, a larger unisize should be considered to keep generatednoise and energy use to a minimum.
Heat Transer Air PD
Water PD
(or a given fow rate) Cost
Increase # o Rows
Increase # o Circuits
Sound Selection Procedure
The laboratory attained sound powerlevels or each unit at various an fows arepresented in the Acoustical Data tables.This data is derived in accordance withANSI/AHRI Standard 350 and shows theraw sound power levels o the an coil inthe 2nd through 8th octave bands with NOattenuation allowances.
The sound power levels include combinedradiated and discharge noise or unitsoperated at ree-delivery conditions withoutenclosures or ductwork. The sound powerlevels are useul or comparison purposesbetween unit size and manuacturer buthave limited value in determining theroom noise level. Contact our ApplicationEngineering group or assistance when thisis required.
Generally the an coil unit should be selectedat medium speed to reduce the noise level andprovide uture air fow adjustment fexibility.
To reduce noise rom urred in units, the ancoil should be mounted above a closet oradjacent space and ducted to a diuser witha short run o lined duct. Acoustically linedfex on the diuser connection will urtherreduce discharge sound rom entering thespace. A short section o lined duct on thereturn will also be benecial or inlet soundreduction. A ceiling with high transmissionloss will help reduce radiated sound.
Noise Reduction Design Considerations
Supply
Duct
Fan Coil Unit
Corridor
Return
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3/6F1-26All Metric dimensions ( ) are soft conversion. Copyright Price Industries Limited 2011.Imperial dimensions are converted to metric and rounded to the nearest millimetre.
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PIC-FC
LINKER interface and softwarefor local setup
PCT-D and Linker Tool
Controls
Price oers actory mounted controlpackages or an coils to support standaloneand networkable solutions.
Basic Thermostats
The RAB, RCC and RDF thermostats areeconomical solutions or providing standalonecontrol to each an coil unit.
These thermostats eature a manual 3 speed answitch and are available or low voltage and linevoltage applications. Available options include:
2pipeand4pipeoperation.
Manualorautomaticchangeover.
Variousoperatingmodessuchaseconomy
and rost protection.Price Controlling Thermostat (PCT-D)
The PCT-D coupled with the Price Fan speedcontrol board (FC PSC3) provides simplestandalone control while oering a variety osequence options.The thermostat eatures adial adjustment and an occupancy button.The ollowing control sequence options aresupported by the PCT-D:
Automatic fanspeedadjustment (coupledwith the FC PSC3 Fan speed control board).
On/offormodulatingcontrolofwatervalves.
Automaticheat/coolchangeoverfor2pipeand 4 pipe systems.
Dischargeairtemperaturemonitoringof 4
pipe system. Nightsetbackwithoccupancyoverride.
Linker Device and Service Tool
The PCT-D comes pre-calibrated rom theactory; however, i eld adjustments arerequired, the Linker device gives the enduser this capability. Connecting to theservice port o the PCT-D thermostat, withthe aid o a laptop, the ree Linker Sotwarerom Prices website allows you to view themenus and change parameters within thePCT-D an coil controller.
Price Intelligent Controller forFan Coils (PIC-FC)
The PIC FC controller is designed specicallyor an coil applications oering maximum
fexibility and the ability or standalone ornetworked operation. A variety o inputs andoutputs allows coniguration o standardor complex control sequences includingvariable speed an fow, on/o or modulatingcontrol valves and discharge air temperaturecontrol. A range o thermostat options areavailable to suit the application including, LCD,motion sensor and wireless models. With theexception o wireless the thermostats connectwith ast and error proo RJ-45 cables. ThePIC FC architecture has a modular designwhich allows or a BACnet expansion module(PIC-BAC) to be added when connection to a
Fan Coils
Controls
Typical Fan Coil setup
Control Valve
Thermostat
Fan Coil Unit
T
Coil
central BAS system is required. The PIC-BACexpansion module can be actory installed,or connected in the eld via the ribbon cable.
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Copyright Price Industries Limited 2011. All Metric dimensions ( ) are soft conversion .Imperial dimensions are converted to metric and rounded to the nearest millimetre. F1-27
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LCD Thermostats
BACnet Module
Price LINKER (Setup Tool)
Standalone LCD-SETUP
Fan Coils
PIC-FC Features
PIC Plug N Play
Wireless Thermostat LCD Thermostat withMotion Sensor
Flexible Thermostat Options
The PIC-FC has 5 thermostat options toft the buildings decor and architecturalrequirements all with a dierent rangeo unctionality.
BlankFaceThermostat
DialThermostat
LCDThermostat
LCDw/MotionThermostat
WirelessThermostat
Features and Benefts
The PIC-FC controls are designed andmanuactured in-house at Price, whichbrings many benefts when ordering a an
coil unit with Price controls. Controllersareprogrammedin-house
no delay on lead times.
Factory programmed with required
sequence and ready to go!
Easy RJ-45 connections to the
thermostat and the BACnet expansionmodule.
Pluggableterminalsfor inputs,outputs
and 24VAC power.
Customsequencesavailableuponrequest.
Easyeldadjustments.
The PIC-FC comes pre-calibrated rom theactory, however ield adjustments arepossible i required. There are several waysto access the setup variables in the PIC-FC.
1. Through the password protected menustructure built into the LCD thermostat.
2. Using the standalone setup tool: LCD-SETUP. It can be plugged into eitherthe Dial Thermostat or the RoomSensor Thermostat and used to setupthe controller when a computer is notavailable.
3. Through the service jack located on thebottom o each thermostat and the PriceLINKER device with a laptop
4. Through the BACnet network (orcontrollers ordered with the BACnetoption).
For more inormation on both the PriceControllingThermostat and PIC or Fan Coilsplease reer to Section G - Controls.
Setup o the PIC-FC
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5/6F1-28All Metric dimensions ( ) are soft conversion. Copyright Price Industries Limited 2011.Imperial dimensions are converted to metric and rounded to the nearest millimetre.
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Variable Fan Flow
One o the key benets o the three speedan motor is the ability to operate at variablean fow during both cooling and heatingmodes. This provides exceptional roomtemperature control as well as energysavings.The ollowing is a control sequenceexample.
Cooling: On an increase in spacetemperature above the set-point, thecontroller opens the chilled water valve. Ispace temperature continues to increase,the controller will modulate the an speedto a higher air fow to maintain the roomset point.
Dead Band: With no demand in the space,the water valve actuator remains closed, Fanfow remains on low speed.
Heating:On a decrease in space temperaturebelow the set-point, the controller opensthe hot water valve. I space temperaturecontinues to decrease, the controller willmodulate the an speed to a higher air fowto maintain the room set point.
Automatic Heat-Cool Changeover
When 2 pipe systems are utilized the an coilcontrols can be selected to automaticallyswitch rom cooling to heating or vice versabased on the entering water temperature.This is accomplished with the additiono a actory supplied temperature sensor
eld applied to the water supply pipe. Theollowing is a control sequence example;
Chilled Water Supply: On an increase inspace temperature the controller opens thewater valve. I space temperature continuesto increase the an speed will modulate toa higher air fow. On a decrease in spacetemperature the controller modulates thean to minimum speed and nally closesthe water valve.
Dead Band: With no demand in the space,the water valve actuator remains closed. FanFlow remains at minimum speed.
Hot Water Supply:On a decrease in spacetemperature the controller opens the watervalve. I space temperature continues to
decrease the an speed will modulate toa higher air fow. On an increase in spacetemperature the controller modulates thean to minimum speed and nally closesthe water valve.
Dynamic Heat-Cool changeover: Iwater temperature will aid in the heatingor cooling o the space the controller willmodulate the water valve otherwise nomodulation will occur. (Eg. Space set-pointat 72 F and water temperature below set-point = cooling mode. Space set-point at 72F and water temperature above set-point =Heating mode).
3 Speed Fan FlowHeating ON Cooling ON
ON
OFF
High
Med
Low Low
Med
HighMax. Airflow
Min. Airflow
WarmCool Room Condition
RoomSet point
0.9F 0.9F
ValveSignal
Variable Fan Flow w/ Automatic Heat/Cool Changeover
Fan Coils
Typical Control Sequences
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Copyright Price Industries Limited 2011. All Metric dimensions ( ) are soft conversion .Imperial dimensions are converted to metric and rounded to the nearest millimetre. F1-29
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Discharge Air Temperature Control
Both the PCT-D and the PIC-FC can besupplied with a discharge air temperature(DAT) sensor to maintain the discharge airtemperature o the an coil at a user denedset-point or both cooling and heatingoperation. During cooling the DAT controlcan be set at a temperature to maintainacceptable humidity in the space. Duringheating the DAT control can be set at atemperature to maintain acceptable roomair distribution and prevent stratication.The ollowing is a control sequence example;
Chilled Water Supply: On an increasein space temperature above the set-point,
the controller modulates the water valve tomaintain 55F discharge air temperature.This 55F is adjustable using the Linker USBsetup tool. I space temperature continuesto increase, the controller will increase thean fow and modulate the the water valve tomaintain the set discharge air temperature.
Hot Water Supply: On a decrease inspace temperature below the set-point,the controller modulates the water valveto maintain a discharge air temperature o90F. This 90F valve is adjustable using theLinker USB setup tool. I space temperaturecontinues to decrease, the controller willincrease the an fow and modulate the thewater valve to maintain the set dischargeair temperature.
Dead Band:With no demand in the space,the water valve actuator remains closed. Fanfow remains on low speed.
Discharge Air Temperature Control
3 Speed Fan FlowHeating ON Cooling ON
10 Volts
0 Volts
High
Med
Low Low
Med
HighMax. Airflow
Min. Airflow
WarmCool Room Condition
RoomSet point
1F 1F
ValveSignal
2F 2F
Heating%Co
oling
%
Valve modulates to maintainspace setpoint
Valve modulates to maintaindischarge setpoint
Fan Coils
Typical Control Sequences
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