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

Also see for 58TUA: Service and maintenance instructions User's information manual User's information manual Installation, start-up, and operating instructions Installation, start-up, and operating instructions

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

(1.) The thermostat closes the R-G circuit for low heat andstarts the furnace blower motor BLWM on heat pumplow-heat speed (identical to low-cooling speed). Clos-ing the R-Y/Y2 circuit to the furnace provides blowermotor BLWM heat pump high-heat speed.NOTE: The furnace control CPU controls blower motor BLWMspeed by sensing only G (for heat pump low-heat speed) and Y2(for heat pump high-heat speed).(2.) The EAC terminals EAC-1 and EAC-2 are energizedwith 115v when the blower motor BLWM is operatingon either heating speed.(3.) When the thermostat is satisfied, the furnace blowermotor BLWM continues operating on the heatingspeed for an additional 90 sec.(4.) Opening only the R-Y/Y2 circuit reduces the blowermotor BLWM speed to heat pump low-heat speed.6. Defrosta. When the furnace control R to W/W1-and-Y/Y2 circuitsare closed, the furnace control CPU continues blowermotor BLWM operation at the heat pump heating speeduntil the end of the prepurge period, then shuts off until theend of the HSI ignitor-on period (22 sec).b. When installed with a heat pump, the furnace control CPUautomatically holds the blower off time to 22 sec during theHSI ignitor on period. After 17 sec of the HSI ignitor-onperiod, a trial for ignition sequence occurs as describedabove for gas heating. After flame is proved and without ablower on delay, the blower motor BLWM will operate onhigh-gas-heat speed during defrost. For both single-speedand 2-speed heat pumps, defrost mode is in high-gas heatonly.c. When furnace control R-W/W1 circuit is opened, thefurnace control CPU begins the normal inducer post purgeperiod and the blower motor BLWM remains on for theblower off delay period. If the R-G circuit remains closed,the blower motor BLWM reverts to continuous operation.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 for 1 to 4 sec. (See Fig. 10.)NOTE: The component test feature will not operate if the controlis receiving any thermostat signals or until all time delays haveexpired.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 on low-gas-heat/heat pumplow-heat/low-cool/continuous fan speed for 7 sec, thenstops.d. The blower motor operates on high-gas heat for 7 sec, thenstops.e. The blower motor operates on heat pump high-heat/high-cool speed for 7 sec, then stops.The gas valve and humidifier terminal HUM are not energizedfor safety reasons.NOTE: The EAC terminals are energized when the blower isenergized.2. After all connections have been made, purge gas lines andcheck for leaks.Never purge a 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.Fig. 10—Control CenterA933481 2 34 5 67 8 9PR2L2COMPR1L1EAC-2EAC-1HI-COOLHI-GAS-HEATLO-GAS-HEATPARK3FU1SEC-1SEC-211 2 34 5 67 8 910 11 12MASTER SLAVETWINTESTLEDGRY/Y2W/W1COM24 VW21ONOFF1 2 3 4FURNACE ANDBLOWER OFF DELAYSETUP SWITCHES24-VOLTTHERMOSTATTERMINALSEAC - ELECTRONICAIR CLEANER(115-VAC 1 AMP MAX)3-AMPFUSELED -DIAGNOSTICLIGHTTWIN / TESTTERMINALHUM -HUMIDIFIER(24-VAC 0.5AMP MAX)HUMFig. 11—Setup Switches on Control Center(Factory Settings)A93377BLOWER-OFFDELAYLOWHEAT(ADAPTIVEALOGRITHM)ONLYHIGHHEATON OFF432112