GPCH3 Installation Manual
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16. Check to see if all supply and return air grilles are
adjusted and the air distribution system is balanced
for the best compromise between heating and cooling.
17. Check for air leaks in the ductwork.
18. See Sections on
19. Make sure the unit is free of “rattles”, and the tubing
in the unit is free from excessive vibration. Also make
sure tubes or lines are not rubbing against each other
or sheet metal surfaces or edges. If so, correct the
trouble.
20. Set the thermostat at the appropriate setting for
cooling and heating or automatic changeover for
normal use.
21.
22. The foregoing “Start-up Procedure and Check List” is
recommended to serve as an indication that the unit
will operate normally.
room thermostat for both heating and cooling. The
contactor has a 24V coil and supplies power to the
compressor and outdoor fan motor.
- This item is “ON” whenever
power is supplied to the unit and the crankcase
heater thermostat is closed. Crankcase heater
thermostat closes at 67° and opens at 85°. It warms
the compressor crankcase thereby preventing liquid
migration and subsequent compressor damage. The
insert type heater is self regulating. It is connected
electrically to the contactor L1 and L2 terminals.
- This item is activated by the
contactor during heating and cooling, except during
defrost and emergency heat operation.
- This item is activated by the contactor
for heating and cooling, except during emergency
heat. It is protected by an internal overload.
- This control is activated by the
contactor.
- The Defrost control provides time/
temperature initiation and termination of the defrost
cycle. When a Defrost cycle is initiated, the defrost
control shifts the reversing valve to “cooling” mode,
stops the outdoor fan and brings on supplemental
heat. Normally, a Defrost cycle will take only 2-3
minutes unless system is low on charge or outdoor
compressor delay.
- These optional controls are
used to prevent full electric heater operation at varying
open above their set points and closed below to
permit staging of indoor supplement heater operation.
to comply with this requirement may result in damage
to the product which may not be covered by the
manufacturer’s warranty.
8. Reversing Valve Coil - This coil is activated by the
thermostat, in the cooling mode and during defrost.
It positions the reversing valve pilot valve for cooling
operation.
- Units with EEM Motors The
EEM model indoor blower motor is activated by the
room thermostat by cooling/HEATING or fan ON
position. The motor is energized by a 24 volt control
EEM motors are constant torque motors with very low
power consumption.
for speed
- This relay is used to
energize the blower during the electric heat operation.
Some room thermostats do not energize the motor
during electric heat. This relay insures blower
operation when the room thermostat energizes heat.
This relay has a 240 volt coil and an 8 amp contact
relay. This relay is energized by the electric heat kit
sequencer.
11. The heat pump is a relatively simple device. It
operates exactly as a Summer Air Conditioner unit
when it is on the cooling cycle. Therefore, all the
charts and data for service that apply to summer
air conditioning apply to the heat pump when it is
on the cooling cycle, and most apply on the heating
cycle except that “condenser” becomes “evaporator”,
“evaporator” becomes “condenser”, “cooling”
becomes “heating”.
When the heat pump is on the heating cycle, it is necessary
external to the compressor. This is accomplished with a
reversing valve. Thus, the hot discharge vapor from the
condenses to liquid. It then goes through the expansion
where the liquid is evaporated, and the vapor goes to the
compressor.