8
4. Turn the fan switch to the “ON” position. The blower
should operate after a 10 second delay.
5. Turn the fan switch to “Auto” position. The blower should
stop after a 60 second delay.
6. Slowly lower the cooling temperature until the unit starts.
The compressor, blower and fan should now be operating.
Allow the unit to run 10 minutes, make sure cool air is
being supplied by the unit.
7. Turn the temperature setting to the highest
position, stopping the unit. The indoor
blower will continue to run for 60 seconds.
8. Turn the thermostat system switch to “OFF”
and disconnect all power when servicing the
unit.
Heat Pump Start-Up Procedure
9. Check the cooling mode for the heat pump
in the same manner as above. The reversing
valve is energized when the thermostat is
placed in the cooling position. A clicking sound
should be noticeable from the reversing
valve. By lowering the temperature setting
to call for cooling, the contractor is
energized. The compressor, blower and fan
should then be running. After the cooling
mode is checked out, turn the thermostat
system switch to “OFF
”.
10. Turn the thermostat system switch to “HEAT”
and fan switch to “AUTO
”.
11. Slowly raise the heating temperature setting.
When the heating first stage makes contact,
stop raising the temperature setting.. The
compressor, blower and fan should now be
running with the reversing valve in the de-
energized (heating) position. After giving the
unit time to settle out, make sure the unit
is supplying heated air.
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.
WARNING
HIGH
VOLTAGE
!
D
ISCONNECT
ALL
POWER BEFORE SERVICING OR INSTALLING
THIS UNIT.
M
ULTIPLE POWER SOURCES MAY BE PRESENT. FAILU
TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY O
DEATH.
RE
R
E
V
A
P
O
R
A
T
O
R
CO OLING
SER VIC E VALVE
SERV IC E PO RT
R EVERSING V AL VE
C
O
N
D
E
N
S
E
R
SER VIC E POR T
CO MPR ESS OR
SERV IC E POR T
AC C UM U LATO R
EX PA NSION DEVIC E
CH ECK VALVE
OR IF IC E
SE RVIC E
VA LV E
C H EC K VAL VE
OR IF ICE
INDO OR
CO IL
D IST RIBU TOR
OU TDO OR
COIL
E
V
A
P
O
R
A
T
O
R
HEATING
SERV IC E VALVE
SE RV IC E PO RT
RE VE RSING V ALVE
C
O
N
D
E
N
S
E
R
CO MPR ESSOR
SERV IC E POR T
AC C UM UL ATO R
CH ECK VALVE
OR IF ICE
SER VIC E
VALVE
CH ECK VALVE
OR IFIC E
IN DO OR
CO IL
DISTR IBU TOR
OU TD OOR
C OIL
D IST RIBU TOR
HEAT PUMP REFRIGERANT CIRCUIt - FIGURE 7
