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condenser or evaporator
a heat pump is either a ___________ depending on the direction of refrigerant flow
total heat rejected by the condenser equals the heat absorbed by the evaporator plus the heat of what?
absorb heat from the outside air
as the outdoor temperature drops, so does the heat pumps ability to?
suction line and the compressor discharge
the reversing valve connections which do not change are the what?
a common method of metering the refrigerant to each coil is to use two metering devices along with two what?
what becomes most important during the heating cycle when the outdoor coil is being used as an evaporator
heating season, when the compressor is coldest
refrigerant migration to the compressor crankcase during its off-cycle is fastest when?
oil foaming, slugging, hard starting, loss of lubrication
migration is a problem because it can cause?
coil/air temp differential, air pressure differential, electronic temp sensing
what are 3 methods for sensing fros build-up?
turn off the outdoor fan motor and put the reversing valve in the cooling mode
the defrost relays 2 main functions are what?
seasonal energy efficiencty ratio ( tells how efficient a heat pump is at providing heating and cooling)
what is seer?
supplemental heat must be added
because extremely low temperatures reduce capacity, what must be done in these conditions to provide the necessary heat?
2nd stage heat on the thermostat
the supplementary heaters are controlled by ________ set to kick in 2* above the set point
locks out the compressor, makes second stage heat first stage, allows all heating elements to be used on a call for heat
energizing the emergency heat system does what 3 things?
restriction of air flow over the indoor coil causes ______ discharge temps in the summer and _____ discharge temps in the winter
low outdoor temps during the heating mode of operation
heat pump compressors must be able to operate at higher compression ratios because of?
breakdown the lubricating oil which results in compressor failure
the high compression ratios, pressures and temps found in heat pump systems are dangerous because they?
slow fan, improper duct size or duct restrictions, blocked diffuser
what are 3 other causes for insufficient air flow?
compressor can overload or the unit will shutdown on high pressure
what problems can occur when the heat pump is operated in the heat cycle at temps above 65*?
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