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

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Carrier 58UHV Installation, Start-up, And Operating Instructions Manual Manual pdf 12 page image

2. Humidifier (HUM)Screw terminals (HUM and COM 24V) are provided for 24-vhumidifier connection. The terminals are energized with 24v,0.5-amp maximum when the gas valve is energized.Do not connect furnace control HUM terminal to HUM(humidifier) terminal on Thermidistat™, Zone Controller, orsimilar device. See Thermidistat, Zone Controller, thermostat,or controller manufacturer’s instructions for proper connec-tion. A failure to follow this warning could result in fire.NOTE: A field-supplied, 115-v controlled relay connected toEAC terminals may be added, if humidifier operation is desiredduring blower operation.Step 7—VentingRefer to the enclosed Installation Instructions, (Vent Tables For 1-and 2-Stage Category I Fan-Assisted Furnaces) for quick, easyreference and national or local code such as NFGC in the UnitedStates, or NSCNGPIC in Canada, for proper vent sizing andinstallation requirements.After fully assembling the vent connector to the furnace flue collar,securely fasten the vent connector to the collar with 2 field-supplied, corrosion-resistant, sheet metal screws located 180degrees apart and midway up the collar.The horizontal portion of the venting system shall maintain aminimum of 1/4-in. upward slope per linear ft and it shall berigidly supported every 5 ft or less with hangers or straps to ensurethat there will be no movement after installation.‘Step 8—Start-Up, Adjustment, and Safety CheckGENERALThe furnace must have a 115-v power supply properly connectedand grounded. Correct polarity must be maintained to enable gasheating operation.The gas service pressure must not exceed 0.5 psig (14-in. wc), andno less than 0.16 psig (4.5-in. wc).Thermostat wire connections at R and W/W1 are the minimumrequired for gas heating operation. W2 must be connected for2-stage heating thermostats. Y/Y2 and G are required to beconnected to the furnace for cooling and heat pumps. G is requiredfor continuous-fan. COM 24v is required for some clock thermo-stats. These connections must be made at the 24-v terminal blockon furnace control. (See Fig. 12.) O is required for heat pumpsonly. Y1 is required for 2-stage cooling and 2-stage heat pumps.The O and Y1 connectors must be made to the ICM2+ furnace’sorange and blue leads, flagged "O" and "Y1," respectively.This furnace can be installed with either a single-stage heating ora 2-stage heating thermostat.For single-stage thermostats, connect thermostat R to W/W1 at thefurnace control terminal block. (See Fig. 13.) For single-stagethermostats, the control will determine, based on length of previ-ous heating on and off cycles, when to operate in low- andhigh-stage for optimum comfort. Setup switch-2 (SW-2) must bein the factory-shipped OFF position. See Fig. 15 and Tables 6 and7 for setup switch information.If a 2-stage heating thermostat is to be used, move SW-2 to the ONposition at end of furnace installation. This overrides built-incontrol process for selecting high- and low-stage and allows the2-stage thermostat to select gas heating modes. The W2 fromthermostat must be connected to W2 on control terminal block.(See Fig. 14.)This furnace is equipped with a manual reset limit switch inthe gas control area. The switch will open and shut off powerto the gas valve if a flame rollout or overheating conditionoccurs in the gas control area. DO NOT bypass the switch.Correct inadequate combustion-air supply, component fail-ure, or restricted flue gas passageway before resetting theswitch.Before operating furnace, check each manual reset switch forcontinuity. If necessary, press and release the button to resetswitch. The blower compartment door must be in place tocomplete the 115-v circuit to furnace.SEQUENCE OF OPERATIONUsing schematic diagram in Fig. 16, follow the sequence ofoperation through the different modes. Read and follow diagramvery carefully.NOTE: The GE ICM2+ BLWM speeds are infinitely variablefrom 300 to 1400 rpm and are dynamically controlled to preciselycontrol airflow rate (CFM). The ICM2+ motor ramps to speed ata controlled rate to reduce start-up noise perception (4 to 11 sec,depending on the target CFM). The ICM2+ motor ramps downslowly to a stop in the same time as ramp-up time. ICM2+ ramp-upand ramp-down times are additive to blower-on and -off delays,respectively. The ICM2+ is 115-v energized whenever power isavailable at furnace control, but operates only when 24-v motorcontrol input(s) are on.NOTE: If a power interruption occurs during a call for heat(W/W1 or W/W1 and W2) and if the thermostat is still calling forgas heating, the control will start a 90-sec blower only on period2 sec after power is restored. The red LED will flash code 12during the 90-sec period, after which the LED will be oncontinuously as long as no faults are detected. The ICM2+ motorwill operate at low-gas heat CFM after a power interruption ineither low- or high-heat. After 90-sec period, furnace will respondto the thermostat normally.The blower door must be installed for power to be conductedthrough blower door interlock switch (ILK) to furnace control(CPU), transformer (TRAN), inducer motor (IDM), blower motor(BLWM), hot surface ignitor (HSI), and gas valve (GV).Fig. 15—Setup Switches on Furnace Control(Factory Settings)A96402BLOWER-OFFDELAYLOWHEAT(ADAPTIVEALGORITHM)HIGHHEATONLY4 3 2OFFON112→→→→→