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 15 page image

(2.) The EAC terminals EAC-1 and EAC-2 are energizedwith 115v when the blower motor BLWM is operatingon either cooling speed.(3.) When thermostat is satisfied, the furnace blowermotor BLWM continues operating on cooling speedfor an additional 90 sec.c. Single-Speed Heat Pump Heating(1.) The thermostat and accessory interface kit R to G-and-Y/Y2 circuits start the furnace blower motorBLWM on heat pump high-heat speed (identical tohigh-cool speed).(2.) The EAC terminals EAC-1 and EAC-2 are energizedwith 115v when the blower motor BLWM is operat-ing.(3.) When thermostat is satisfied, the furnace blower motorBLWM continues operating on heat pump high-heatspeed for an additional 90 sec.d. Two-Speed Heat Pump Heating(1.) The thermostat closes R-G circuit for low heat andstarts furnace blower motor BLWM on heat pumplow-heat speed (identical to low-cooling speed). Clos-ing R-Y/Y2 circuit to furnace provides blower motorBLWM 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 thermostat is satisfied, the furnace blowermotor BLWM continues operating on heating speedfor an additional 90 sec.(4.) Opening only R-Y/Y2 circuit reduces blower motorBLWM speed to heat pump low-heat speed.6. Defrosta. When furnace control R to W/W1-and-Y/Y2 circuits areclosed, furnace control CPU continues blower motorBLWM operation at heat pump heating speed until the endof the prepurge period, then shuts off until the end of theHSI ignitor-on period (22 sec).b. When installed with a heat pump, the furnace control CPUautomatically holds blower off time to 22 sec during HSIignitor on period. After 17 sec of HSI ignitor-on period, atrial for ignition sequence occurs as described above forgas heating. After flame is proved and without a blower ondelay, the blower motor BLWM will operate on high-gas-heat speed during defrost. For both single-speed and2-speed heat 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 blower motor BLWM remains on for theblower off delay period. If R-G circuit remains closed,blower motor BLWM reverts to continuous operation.Step 3—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. 14.)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 energized forsafety 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.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.Step 4—Adjustments1. Set gas input rate.Furnace gas input rate on rating plate is for installations ataltitudes up to 2000 ft.In the U.S.A., input rating for altitudes above 2000 ft must bereduced by 4 percent for each 1000 ft above sea level.In Canada, input rating must be derated by 10 percent foraltitudes of 2000 ft to 4500 ft above sea level.Furnace input rate must be within ±2 percent of input onfurnace rating plate.2. Determine natural gas orifice size and manifold pressure forcorrect input.a. Obtain yearly heat value average (at installed altitude) fromlocal gas supplier.b. Obtain yearly specific gravity average from local gassupplier.c. Verify furnace model. Table 9 can only be used for model58TUA Furnaces.d. Find installation altitude in Table 9.NOTE: For Canada altitudes of 2000 to 4500 ft, use U.S.A.altitudes of 2001 to 3000 ft in Table 9.e. Find closest natural gas heat value and specific gravity inTable 9.15