Carrier 58UHV Installation, Start-up, And Operating Instructions Manual

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Carrier 58UHV Installation, Start-up, And Operating Instructions Manual Manual pdf 16 page image

needed for 2-speed heat pumps. See 2-speed heat pump InstallationInstructions to determine whether a standard or dual-fuel heatpump thermostat is required and for thermostat connections.a. Single-Speed Heat Pump Cooling(1.) The thermostat and interface kit close the R toY/Y2-and-G-and-O circuits to operate the furnaceBLWM at cooling airflow. The Y/Y2 input to thefurnace control is necessary to provide adequate cool-ing airflow.(2.) Terminals EAC-1 and EAC-2 are energized with 115vwhen BLWM is operating.(3.) When thermostat is satisfied, furnace BLWM contin-ues operating at cooling airflow for an additional 90sec.b. Two-Speed Heat Pump Cooling(1.) The thermostat R to G-and-Y1-and-O circuits operatethe furnace BLWM at low-cool airflow. The thermo-stat R to G-and-Y/Y2-and-Y1-and-O circuits operatethe furnace BLWM at high-cool airflow (105 percentof single-speed cooling airflow).NOTE: The furnace control CPU controls blower airflow bysensing G, Y1, and O for low-cool airflow and G, Y1, Y/Y2, andO for 2-speed high-cool airflow.(2.) Terminals EAC-1 and EAC-2 are energized with 115vwhen the BLWM is operating at either cooling air-flow.(3.) When the thermostat is satisfied, the furnace BLWMcontinues operating at the same cooling airflow for anadditional 90 sec.c. Single-Speed Heat Pump Heating(1.) The thermostat and accessory interface kit R to G-and-Y/Y2 circuits operate the furnace BLWM at heatpump heating airflow. Heating airflow is the same ascooling airflow for airflow selection HP-EFFY and 90percent of cooling airflow for HP-CMFT selection.(2.) Terminals EAC-1 and EAC-2 are energized with 115vwhen the BLWM is operating.(3.) When thermostat is satisfied, the furnace BLWMcontinues operating at same heat pump heating airflowfor an additional 90 sec.d. Two-Speed Heat Pump Heating(1.) The thermostat closes R to Y1-and-G circuits for lowheat and operates the furnace BLWM at heat pumplow-heat airflow (may not be identical to low-coolingairflow, depending on HP selection at airflow selec-tor). Closing R-Y/Y2, Y1 and G circuits to furnaceprovides BLWM heat pump high-heat airflow.NOTE: The furnace control CPU controls BLWM airflow bysensing G and Y1 for heat pump low-heat airflow, and G, Y1, andY/Y2 for heat pump high-heat airflow (105 percent of single-speedheating airflow).(2.) Terminals EAC-1 and EAC-2 are energized with 115vwhen BLWM is operating at either heating airflow.(3.) When the thermostat is satisfied, the furnace BLWMcontinues operating at same heating airflow for anadditional 90 sec.(4.) Opening only R-Y/Y2 circuit switches BLWM to heatpump low-heat airflow.6. Defrosta. When furnace control R to W/W1-and-Y/Y2 circuits areclosed, furnace control CPU continues BLWM operation atheat pump heating airflow until the end of prepurge period,then shuts off until the end of HSI igniter-on period (22sec).b. When installed with a heat pump, the furnace control CPUautomatically holds the blower-off time to 22 sec duringHSI igniter-on period. After 17 sec of the HSI igniter-onperiod, a trial-for-ignition sequence occurs as describedabove for gas heating. After flame is proven and without ablower-on delay, BLWM then operates at high-gas-heatairflow during defrost. For both single-speed and 2-speedheat pumps, defrost mode is in high-gas heat only.c. When furnace control R-W/W1 circuit is opened, thefurnace control CPU begins the normal inducer post-purgeperiod and the BLWM continues operating for the blower-off delay period. If the R-G circuit remains closed, theBLWM reverts to continuous-blower operation.SET-UP PROCEDURESThe ICM2+ blower motor operating mode selections are made onthe airflow selector (AFS) control with color-coded jumper wires.The factory jumper settings have large bold circles marked aroundthe pins. (See Fig. 17.)NOTE: The ICM2+ furnaces are not approved for twinning.1. Gas Heatinga. The VIOLET wire is factory connected to 1 of 4 pins: A, B,C, or D on airflow selector. The factory pin selection can bechecked by noting PIN marking in lower right-hand cornerof furnace rating plate.b. The gas heating air temperature rise is selected on airflowselector (See Figs. 16 and 17.) with RED and VIOLETjumper wires. The selections are MID, HI, and MED-HI.MID gives mid point of temperature rise range marked onrating plate. HI gives high end of temperature rise range.MID-HI gives temperature rise about halfway betweenMID and HI. Select the rise by moving WHITE connectorson RED and VIOLET jumper wires to desired pin posi-tions. These settings select the rise for high and low heat.See Table 8 for air temperature rise.2. Cooling and Heat Pump Heatinga. The cooling and heat pump selections can be determinedfrom Tables 9 and 10. The selections are made by movingthe WHITE connector on appropriately colored jumperwire to desired pin position.NOTE: Power must be cycled off and then on for the cool sizeselection to take effect. Power need not be cycled off and on for theCFM/TON to take effect.b. The YELLOW COOL SIZE jumper is used to selectairflow to match the needed tons for the cooling or heatpump system. The BLUE CFM/TON jumper is used toselect a slight adjustment to airflow. The traditional CFMper ton is 400 for cooling and heat pump airflow. 350 CFMper ton is the airflow used to attain best efficiency withthese units. 315 CFM per ton is the airflow used forimproved dehumidification and/or with undersized ducts.Additional humidity control can be attained by using ahumidistat. (See Set-up Procedures section, item 4.)c. The ORANGE jumper wire selects airflow for cooling-only(AC) or heat pump heating and cooling, and selects heatpump heating best efficiency (HP EFFY) or enhancedcomfort (HP CMFT). HP EFFY provides the same heating16