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

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Carrier 58UHV Installation, Start-up, And Operating Instructions Manual Manual pdf 15 page image

CFM per ton is the airflow used to attain the best efficiencywith these 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 heatingairflow as used for cooling. HP CMFT reduces the heatingairflow to 90% of the cooling airflow for a higher airtemperature rise and better comfort.3. Continuous-fanThe GREEN jumper wire selects the airflow CFM forcontinuous-fan. LO provides 50% of the airflow used forsingle-speed cooling or 2-speed cooling. MED provides 65%of cooling airflow. HI provides 100% of cooling airflow forcontinuous-fan operation.NOTE: If HI is selected with a 2-speed cooling or heat pumpsystem, the airflow will remain at 100% of high-cooling/heatingwhen the system is in low-cooling and heat pump low-heatingmode. Continuous-fan selection has no effect on gas-heatingairflow.4. As an alternative to selecting 315 CFM per ton for coolingairflow, an active dehumidification mode can be invoked byconnecting a humidistat in series with the GREEN wiremarked DEHUM connected to the 1/4 quick-connect terminalat G on the furnace control. The humidistat contacts shouldopen on a rise in humidity. When the humidistat contactsopen, the airflow will be reduced to 80% of the selectedairflow, except that this airflow will not be reduced to lessthan 280 CFM per ton.NOTE: When a humidistat is calling for reduced airflow and thethermostat is satisfied, the blower will not operate on thecontinuous-fan LOW setting to prevent re-evaporation of conden-sate at the evaporator coil. When continuous-fan MED or HIsetting is selected, normal airflow will be reduced to 80%.START-UP PROCEDURES1. Component test—The furnace features a component testsystem to help diagnose a system problem in the case of acomponent failure. To initiate the component test procedure,ensure that there are no thermostat inputs to the control and alltime delays have expired. Short the TWIN/TEST terminal toground or COM 24V for 1 to 4 sec. (See Fig. 13.)NOTE: The component test feature will not operate if the controlis receiving any thermostat signals or until all time delays haveexpired. The ICM2+ blower motor speed ramp-up will slightlydelay blower response times.The component test sequence is as follows:a. The furnace control checks itself, operates the inducermotor on low speed for 7 sec and on high speed for 7 sec,then stops.b. The hot surface ignitor is energized for 15 sec, thende-energized.c. The blower motor operates at continuous-fan airflow for 7sec.d. The blower motor operates at high-gas heat airflow for 7sec. The gas valve and humidifier terminal HUM are notenergized for safety reasons.e. The blower motor operates at single-speed cooling/heatpump heating airflow (or 2-speed heat pump high-heat/high-cooling) for 7 sec, then stops.NOTE: The EAC terminals are energized when the blower isoperating.2. After all connections have been made, purge gas lines andcheck for leaks.Never purge a gas line into a combustion chamber. Never usematches, candles, flame, or other sources of ignition for thepurpose of checking leakage. Use a soap-and-water solutionto check for leakage. A failure to follow this warning cancause a fire, explosion, personal injury, or death.3. To operate furnace, follow procedures on operating instruc-tions label attached to furnace.4. With furnace operating, set thermostat below room tempera-ture and observe that furnace goes off. Set thermostat aboveroom temperature and observe that furnace restarts.ADJUSTMENTS1. Set gas input rate.Table 8—Gas Heat Airflow—Nominal CFM (With Filter)FURNACESIZEGAS HEATTEMP RISE*GAS HEATTEMP RISE (°F)†GAS HEATAIRFLOW (CFM)Jumper Position High-Stage Low-Stage High-Stage Low-StageRed Wire Violet Wire060HI A 51 45 925 615M-HI A 46 38 1085 730MID D 40 30 1250 1135080HI A 58 44 970 790M-HI A 51 39 1140 925MID D 45 29 1310 1395100HI A 51 44 1430 1035M-HI A 45 39 1685 1215MID D 40 30 1935 1630120HI A 69 49 1330 1240M-HI A 59 43 1560 1460MID D 55 40 1720 1605*Use listed jumper position combinations only.†Within ± 2°F15→