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42 Series
Fan Coil Units
Application Data
Control Selection Guide
for Fan CoilAir Conditioners
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 3 PC 201 Catalog No. 514-203 Printed in U.S.A. Form 42-3XC Pg 1 6-90 Replaces: 42-2XC
Tab 7a
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CONTENTS Page Page UNIT MOUNTED CONTROLS .............. 12,13 CONTROL SELECTION GUIDE ............... 3 Standard 3-Speed Switch ................... 12 STANDARD WIRING PACKAGES ............ 4-8 Combination Thermostat/3-Speed Switch .... 12 Manual Fan Control ......................... 4 Combination Thermostat/ON-OFF Thermostatic Fan Control, Toggle Switch ............................ 12 2-Pipe Systems ............................ 4 Two-Pipe Thermostat ....................... 13 Thermostatic Fan Co
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CONTROL SELECTION GUIDE Use this guide to make sure that all necessary components are provided for and that the components are compatible with the required control system. NOTE: When thermostatic fan control is selected or when unit outside air dampers are used, unit-mounted thermostats are not recommended as their use will result in poor room temperature sensing. CHANGEOVER FAN SYSTEM DESCRIPTION THERMOSTAT ON VALVE NOTES SWITCH (SW) SUPPLY PIPE Fan Fan manually cycled None None None Standard N
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STANDARD WIRING PACKAGES ThestandardswitchhasLOW,MEDIUM,HIGHandOFF IMPORTANT:Wiringdiagramsshowndepicttypical positions plus an auxilliary contact to energize thermostats, control functions. Refer to unit wiring label for spe- valves, dampers, etc. cific functions. NOTE:Wiringdiagramsarefor120-vpowersupply.Ifother voltagesforheatersorcontrolsarespecified,wiringmaydif- fer from that shown. ManualFanControl— OnallVerticalCabinetunits, thestandardfan-speedswitchisfurnishedunit-mountedand The standard
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ThermostaticFanControl,2-PipeSystemwith PACKAGE CODE* UNIT SafetyCycle— Thiscontrolisusedforhighhumidity LOCATION Heating and Cooling TYPE Plus Changeover situations in which condensate problems can occur if fan is turned off while chilled water is still running through the Vertical Unit Mounted 24-R coil. Vertical or Wall Mounted 23-17 The wiring provides fan cycling from HIGH to LOWon Horizontal thecoolingcycleandfromLOWtoOFFontheheatingcycle. *Packages listed on current price pages. AnON-OFFt
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STANDARD WIRING PACKAGES (cont) Two control methods are available: Thermostatic 2-Pipe Auxiliary Electric Heat 1. Usethestandardautomaticchangeoverthermostatwitha with Valve Control — This system, also called Twi- dead band between heating and cooling, or — light or Intermediate Season electric heat, goes a long way towardssolvingthespringandfallcontrolproblemsof2-pipe 2. Use a manual changeover thermostat. With this method systems. only one changeover is required. Youcanrunchilledwaterlateintot
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changeover thermostat is also suitable. A 2-way or 3-way Thermostatic 2-Pipe Total Electric Heat with- valvemustalsobeusedsothatthechilledwaterisoffwhen- ValveControl— With this system, the complete heat- ever the heater is on. No changeover device to sense water ingrequirementforthespaceisprovidedbytheelectricheater; temperature is necessary. thewatersystemisneverchangedoverforheating.Itisthere- NOTE:Wiringdiagramsarefor120-vpowersupply.Ifother forepossible,justaswith4-pipesystems,tohaveheating
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STANDARD WIRING PACKAGES (cont) With this system, the fan runs continuously unless it is ThermostaticValveControl,4-Pipe— The4-pipe manually switched to OFF position. Fan must be on before system provides the ultimate in economy and room tem- thermostat can send signal to open the chilled water or hot peraturecontrol.Bothhotwaterandchilledwaterareavail- water valve. able at any time. NOTE:Wiringdiagramsarefor120-vpowersupply.Ifother Normallyanautomaticchangeoverthermostatisused,but voltagesforhe
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ELECTRIC HEAT 42S stack units, the strip heater is located in the fan dis- Application — Electric heaters are available for charge on the leaving side of the coil. in-stallation on Carrier fan coil units in the following applications. SHEATHHEATERS—UsedwithModel42Vverticalunits. These heaters consist of the highest grade resistance wire, TOTAL ELECTRIC HEAT — This system provides com- 1 centeredina ⁄2-in.diametercopper-platedsteelsheath.The plete heating during the heating season; no boiler is r
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70 60 50 90 80 REMOTE-MOUNTED CONTROLS Standard 3-Speed Switch — This standard switch has 4 positions: OFF, HIGH, MEDIUM, and LOW. Switch hasauxiliarycontactthatisenergizedwhenswitchisinHIGH, MEDIUM or LOW position. Some of the options common with the 3-speed switch are: 1. Unit-mountedswitchonFurred-InVerticalModel.(Avail- able as special order on Horizontal Models) 2. Switch without OFF position. 3. Key-operated switch. Combination Thermostat/3-Speed Switch (Packages 22-B, 22-D, 22-F, 22-H, 22
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R E M R A W COOL WARM ALTERNATE WALL THERMOSTATS WallThermostat(HoneywellModelT4039)with Manual3-SpeedFanSwitchandON-OFFSwitch Temperature range is approximately 55 to 95F in 10°F increments from 75F midpoint. Scale is marked warmer- cooler. Thermostat mounts in 4-in. square junction box or 2-ganged outlet boxes. FAN SYSTEM MODEL PACKAGE HI 2-Pipe Cooling Only T4039B* 23-05 MED 2-Pipe Heating Only T4039F* 23-03 LO 2-Pipe Heating/Cooling† T4039F* 23-01 2-Pipe w/Total Electric Heat T4039M** 23-07
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LO LO MED MED UNIT-MOUNTED CONTROLS COMBINATION THERMOSTATAND TOGGLE SWITCH CombinationThermostat/ON-OFFToggleSwitch Standard3-SpeedSwitch— SwitchhasOFF,HIGH, (Package24-R*)—IncludesModelTF1032-pipethermo- MEDandLOWpositions.Switchisalsoequippedwithaux- stat and toggle switch. Used as special fan control for cy- iliary connection energized when switch is in HIGH, MED cling fan from HIGH to LOW on cooling; from LOW to or LOW position. OFF on heating. CombinationThermostat/3-SpeedSwitch (Pack- age
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STEMCO L80 8220 Two-PipeThermostat,ModelTF103— Thissingle- pole,double-throw(SPDT)thermostathassnap-actioncon- tacts. The standard temperature range is 60 - 90F. Four-PipeThermostat,ModelTH104— Withthis thermostat, heating and cooling are sequenced (automatic changeover) with 6 degree separation between HEATING ON and COOLING ON.The standard temperature range is 60-90F. Thermostat Electrical Data (Pilot Duty — 125 VA at 120-277 v) ITEM VOLTS FLA LRA TF103 120 16 80 and 240 12 60 TH104 277 10 50
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BASIC DEFINITIONS UnitHand—Whenfacingthesupplyairoutletfromthefrontoftheunit(airblow- inginyourface),yourrighthandwillbetherighthandsideoftheunitandyourleft hand the left hand side of the unit. SameEndConnection(2Pipeor4Pipe)—Allpipingconnectionsareonthesameend(side)oftheunit.Controls and electrical connection will be on the end (side) opposite the piping connection. Standard 2-pipe units will be the same end connection. NOTE:Piping determines the hand of the unit. Opposite End Connection (4-Pip
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Hydronic Coil Arrangement FIELD PIPING CONNECTIONS* VERTICALFLOORUNITS—42VB,VE,VF Pipe into cabinet end compartment (opening in bottom and back). VERTICAL FLOOR UNITS — 42VA, VC Pipe to external connections (no cabinet). CEILINGUNITS(EXPOSED)—42CG,CK, DE, DF Pipethroughknock-outsinrearofcabinetto coil and valve package connections. CEILING UNITS (CONCEALED) — 42CA, CE, CF, DA, DC Pipe to connections extending from end of unit. VERTICAL UNITS — 42DD Pipetostubconnectionsextendingfromside of unit.
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VALVE PACKAGES Valve packages are shipped with the units or in unit car- General— Table1listsacceptablepneumaticvalvesfor tons.Valve packages include belled ends for field soldering installationon42seriesfancoilunits.Therearelimitations to coil connections. on physical size of pneumatic valves, quantity and type of matchingcomponents,requiredcontrolinterface.SeeFig.1 All factory-furnished cooling valve packages are ar- for symbols and placement of valves. ranged to position as much of the package
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LEGEND For Fig. 1 1 5 3 7 Component Sizing — ⁄29 nominal (for ⁄89 OD copper tubing) or ⁄49 nominal (for ⁄89 OD copper tubing). Manual Air Vent — Standard component - Brazed into high point of hydronic cooling and/or heating coil circuit. Automatic Air Vent — Brazed into high point of coil circuit. CoilConnections(PositionsA&B)—Whenisolationvalveonlyisaddedtosupplyorreturnline,theisolationvalve will be factory brazed to the coil stub-out.Addition of any other component or connection to the supply
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VALVE PACKAGES (cont) Two-Way Motorized Control Valve The 2-way motorized valve motor drives valve open and a spring returns valve to normally closed position (no water flow with unit OFF). Supplyconnectionatcoilwillbeswagefitforfieldbraze (standard) or union (option). Return connection at coil willbefactorybrazedifisolationvalveonly.Additionof anyothercomponentwillrequireswagefitforfieldbraze or optional union connection. Check job specifications for system pressure, pres- suredroplimitationsandflowra
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Three-Way Motorized Control Valve Onthe3-waymotorizedvalveflowisnormallyclosed tocoilandopentosystemreturn.Motorclosesbypass flow to system return while opening flow through coil. Waterbypassescoilandflowsdirectlytosystemreturn when unit is OFF. The aquastat (A) clips on supply line upstream from 3-wayvalve(asshownabove).Itsensessystemwater temperature to prevent cooling operation with hot wa- terinsystempipingorheatingoperationwithchilledwa- terinsystempiping.Aquastat(s)requiredfor2-pipecooling and
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VALVE PACKAGE ARRANGEMENTS 20
