8
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. 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.
E
V
A
P
O
R
A
T
O
R
COOLING
SERVICE VALVE
SERVICE PORT
REVERSING VALVE
C
O
N
D
E
N
S
E
R
SERVICE PORT
COMPRESSOR
SERVICE PORT
ACCUMULATOR
EXPANSION DEVICE
CHECK VALVE
ORIFICE
SERVICE
VALVE
CHECK VALVE
ORIFICE
INDOOR
COIL
DISTRIBUTOR
OUTDOOR
COIL
E
V
A
P
O
R
A
T
O
R
HEATING
SERVICE VALVE
SERVICE PORT
REVERSING VALVE
C
O
N
D
E
N
S
E
R
COMPRESSOR
SERVICE PORT
ACCUMULATOR
CHECK VALVE
ORIFICE
SERVICE
VALVE
CHECK VALVE
ORIFICE
INDOOR
COIL
DISTRIBUTOR
OUTDOOR
COIL
DISTRIBUTOR
HEAT PUMP REFRIGERANT CIRCUIT
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