Carrier 58PHA/PHX Installation, start-up, operating and Installation And Operating Instructions Manual

Also see for start-up and: Controls, start-up, operation, service and troubleshooting instructions Controls, start-up, operation, service and troubleshooting instructions

Contents

Carrier 58PHA/PHX Installation, start-up, operating and Installation And Operating Instructions Manual Manual pdf 51 page image

515. Heat pump(See Fig. 25 -- 32 for thermostat connections.) Wheninstalled with a heat pump, the furnace controlautomatically changes the timing sequence to avoid longblower off times during demand defrost cycles. When theR--to-- W--and--Y1 or R--to--W--and--Y1--and--G circuitsare energized the furnace control CPU will switch to orturn on the blower motor BLWM at HEAT speed, andbegin a heating cycle. The blower motor BLWM willremain on until the end of the prepurge period, then shutoff for 24 seconds then come back on at HEAT speed.When the W input signal disappears, the furnace controlbegins a normal inducer post--purge period and the blowerremains running at HEAT speed for the selectedblower--OFF delay period then switches to low--coolspeed (same speed as FAN). If theR--to--W--and--Y1--and--G signals disappear at the sametime, the blower motor BLWM will remain on for theselected blower--OFF delay period. If the R--to--W--and--Y1 signals disappear, leaving the G signal, theblower motor BLWM will remain on for the selectedblower--OFF delay period then switch tocontinuous--blower speed. When the R--to--W--and--Y/Y2,R--to--W--and--Y/Y2--and--G, R--to--W--and--Y1--and--Y/Y2, or R--to--W-- and--Y1--and--Y/Y2--and--G circuitsare energized the furnace control CPU will switch to orturn on the blower motor BLWM at HEAT speed, andbegin a heating cycle. The blower motor BLWM willremain on until the end of the prepurge period, then shutoff for 24 seconds then come back on at HEAT speed.When theWinput signal disappears, the furnace controlbegins a normal inducer post--purge period and the blowerswitches to COOL speed after a 3 second delay. If theR--to--W--and--Y/Y2--and--G or R--to--W--and--Y1--and --Y/Y2--and--G signals disappear at the same time, theblower motor BLWM will remain on for the selectedblower--OFF delay period. If the R--to--W--and--Y/Y2 orR--to--W--and--Y1--and--Y/Y2 signals disappear, leavingthe G signal, the blower motor BLWM will remain on forthe selected blower--OFF delay period then switch tocontinuous blower speed.Wiring DiagramsRefer to Fig. 59 for wiring diagram.TroubleshootingRefer to the service label. (See Fig. 55.) The TroubleshootingGuide (See Fig. 60) can be a useful tool in isolating furnaceoperation problems. Beginning with the word “Start,” answereach question and follow the appropriate arrow to the next item.The Guide will help to identify the problem or failed component.After replacing any component, verify correct operationsequence.58PHA

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