Carrier Performance 48VR-A Installation Instructions Manual

Also see for Performance 15 48VR-A: Owner's information manual Owner's information manual

Contents

14Standard ConnectionRun the low--voltage leads from the thermostat, through the inlethole, and into unit low--voltage splice box.Locate nine 18--gage wires leaving control box. These low--voltageconnection leads can be identified by the colors red, green, yellow,brown, blue, white, pink, black and orange (See Fig. 10). Ensurethe leads are long enough to be routed into the low--voltage splicebox (located below right side of control box). Route leads throughhole in bottom of control box and make low--voltage connections(See Fig. 10). Secure all cut wires, so that they do not interfere withoperation of unit.POWERSUPPLYFIELD-SUPPLIEDFUSED DISCONNECTHIGH VOLTAGEPOWER LEADS(SEE UNIT WIRINGLABEL)EQUIP GR3-PHASE SHOWN1-PHASE USESTWO POWERLEADSSPLICE BOXLOW-VOLTAGEPOWER LEADS(SEE UNITWIRING LABEL)WHT(W1) W/W1YEL (Y) Y1/YGGRN(G)RED(R)BRN(C)BLU(DH)RCDHY2W2PINK(Y2)BLK(W2)CONTROL BOX(W2 ON 208/230 VACMODELS ONLY)THERMOSTAT(TYPICAL)(DH ON 208/230 VACMODELS ONLY)OORN(O)A13152Fig. 10 -- High-- and Control--Voltage ConnectionsIMPORTANT: Dehumidification control must open controlcircuit on humidity rise above set point.Use of the dehumidification cooling fan speed requires use ofeither a 24 VAC dehumidistat or a thermostat which includescontrol of a 24 VAC dehumidistat connection. In either case, thedehumidification control must open the control circuit on humidityrise above the dehumidification set point.Heat Anticipator Setting (Electro--MechanicalThermostats only)The room thermostat heat anticipator must be properly adjusted toensure proper heating performance. Set the heat anticipator, usingan ammeter between the W1 and R terminals to determine the exactrequired setting.NOTE: For thermostat selection purposes, use 0.18 amp for theapproximate required setting. Failure to make a proper heatanticipator adjustment will result in improper operation, discomfortto the occupants of the conditioned space, and inefficient energyutilization; however, the required setting may be changed slightlyto provide a greater degree of comfort for a particular installation.Balance Point Setting--Thermidistat or HybridThermostatBALANCE POINT TEMPERATURE--The “balance point”temperature is a setting which affects the operation of the heatingmode. This is a field--selected input temperature (range 5 to 55_F)(--15 to 12_C) where the Thermidistat or dual fuel thermostat willmonitor outdoor air temperature and decide whether to enable ordisable the heat pump. If the outdoor temperature is above the“balance point”, the heat pump will energize first to try to satisfythe indoor temperature demand. If the heat pump does not make asufficient improvement within a reasonable time period (i.e. 15minutes), then the gas furnace will come on to satisfy the indoortemperature demand. If the outdoor temperature is below the“balance point”, the heat pump will not be allowed to operate (i.e.locked out), and the gas furnace will be used to satisfy the indoortemperature. There are three separate concepts which are related toselecting the final “balance point” temperature. Read each of thefollowing carefully to determine the best “balance point” in ahybrid installation:1. Capacity Balance Temperature: This is a point where theheat pump cannot provide sufficient capacity to keep upwith the indoor temperature demand because of decliningoutdoor temperature. At or below this point, the furnace isneeded to maintain proper indoor temperature.2. Economic Balance Temperature: Above this point, the heatpump is the most cost efficient to operate, and below thispoint the furnace is the most cost efficient to operate. Thiscan be somewhat complicated to determine and it involvesknowing the cost of gas and electricity, as well as theefficiency of the furnace and heat pump. For the mosteconomical operation, the heat pump should operate abovethis temperature (assuming it has sufficient capacity) and thefurnace should operate below this temperature.3. Comfort Balance Temperature: When the heat pump isoperating below this point, the indoor supply air feelsuncomfortable (i.e. too cool). This is purely subjective andwill depend on the homeowner’s idea of comfort. Belowthis temperature the gas furnace should operate in order tosatisfy the desire for indoor comfort.Transformer ProtectionThe transformer is of the energy--limiting type, however a directshort will likely blow a secondary fuse. If an overload or short ispresent, correct overload condition and check for blown fuse onIndoor Fan board or Integrated Gas Controller. Replace fuse asrequired with correct size and rating.PRE--START--UPENVIRONMENTAL, FIRE, EXPLOSION,ELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personalinjury or death.1. Follow recognized safety practices and wear protectivegoggles when checking or servicing refrigerant system.2. Do not operate compressor or provide any electric powerto unit unless compressor plug is in place and secured.3. Do not remove compressor plug until all electricalsources are disconnected and tagged.4. Relieve and recover all refrigerant from system beforetouching or disturbing compressor plug if refrigerantleak is suspected around compressor terminals.5. Never attempt to repair soldered connection whilerefrigerant system is under pressure.6. Do not use torch to remove any component. Systemcontains oil and refrigerant under pressure.To remove a component, wear protective goggles andproceed as follows:a. Shut off electrical power to unit and installlockout tag.b. Relieve and reclaim all refrigerant from systemusing both high-- and low--pressure ports.c. Cut component connecting tubing with tubingcutter and remove component from unit.d. Carefully unsweat remaining tubing stubs whennecessary. Oil can ignite when exposed to torchflame.! WARNING48VR-- A