Final System Checks; Components; Contactor; Crankcase Heater - Maytag Amana APC15 H Series Installation Instructions Manual

12. If the out door ambient is above 80°F, the unit may
trip on its high pressure cut out when on heating.
The compressor should stop. The heating cycle
must be thoroughly checked, so postpone the test
to another day when conditions are more suitable
but-DO NOT FAIL TO TEST.
If the out door ambient is low and the unit operates
properly on the heating cycle, you may check the
pressure cutout operation by blocking off the
indoor return air until the unit trips.
13. If unit operates properly in the heating cycle, raise
the temperature setting until the heating second
stage makes contact. Supplemental resistance
heat, if installed should now come on. Make sure
it operates properly.
NOTE: If outdoor thermostats are installed the
outdoor ambient must be below the set point
of these thermostats for the heaters to operate.
It may be necessary to jumper these
thermostats to check heater operation if
outdoor ambient is mild.
14. For thermostats with emergency heat switch, return
to step 11. The emergency heat switch is located
at the bottom of the thermostat. Move the switch
to emergency heat. The heat pump will stop, the
blower will continue to run, all heaters will come
on and the thermostat emergency heat light will
come on.
15. If checking the unit in the wintertime, when the
outdoor coil is cold enough to actuate the
defrost control, observe at least one defrost
cycle to make sure the unit defrosts completely.

Final System Checks

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 Air Flow Measurement and
Adjustment and Checking Charge.
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. Be sure the Owner is instructed on the unit operation, filter, servicing, correct thermostat operation, etc.
The foregoing "Start-up Procedure and Check List" is recommended to serve as an indication that the unit will operate normally.

COMPONENTS

1. Contactor - This control is activated (closed) by the room thermostat for both heating and cooling. The contactor has a 24V coil and
supplies power to the compressor and outdoor fan motor.
2. Crankcase Heater – 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.
3. Condenser Motor - This item is activated by the contactor during heating and cooling, except during defrost and emergency
heat operation.
4. Compressor - This item is activated by the contactor for heating and cooling, except during emergency heat. It is protected by
an internal overload.
5. Contactor Relay - This control is activated by the thermostat (24V coil) and supplies power to the contactor.
HEAT PUMP REFRIGERANT CIRCUIT - Figure 7
8