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I Combination Units
4. Shut OFF electric power at unit disconnect.
5. To check cooling Stage 2, remove jumper wires from
Y1 and place it on Y2.
NOTE: Allow 5 minutes between Steps 4 and 6.
.
Turn ON electric power. Check to see that the following
occu rs:
a. Compressors 1 & 2 - ON
b. Condenser fan motor(s) - ON
c. Circulation air blower - ON
NOTE: If Y2 only is jumpered, condenser fans will not come
on.
7. Shut OFF electric power at unit disconnect. Begin tim-
ing the five minutes for the anti-cycle delay.
8. Remove jumpers from low voltage terminal board.
9. Set Thermostat to COOL and temperature to call for
Cooling.
10. Turn ON electric power. At the end of the five minute
anti-cycle delay, the unit should start and run.
11. Shut OFF electric power at unit disconnect.
12. Replace all service access panels.
9. Operation And Maintenance
Electrical shock hazard.
Turn off electric power supply at disconnect
switch or service panel before removing any ac-
cess or service panel from unit.
Failure to follow this warning can result in prop-
erty damage, personal injury, and/or death.
Installation Instructions
Turning Off the Unit
Heating
1. Set thermostat selector to OFF and fan switch to
AUTO.
2. If electric heat is running at time of shut-down, wait 2.5
minutes then shut OFF electric power supply at dis-
connect switch or service panel. (No wait is necessary
ifelectric heat was not running within 2.5 minutes prior
to shut-down.)
Cooling
1. Set thermostat selector to OFF and fan switch to
AUTO.
2. To shut the unit down completely, shut OFF electric
power supply at disconnect switch or service panel.
Starting the Unit After Shutdown
Heating
1. Set the thermostat to OFF.
4. Turn ON electric power.
5. Set thermostat to desired temperature and set selec-
tor to HEAT. Unit will come on and operate automati-
cally under control of the thermostat.
Cooling
CAUTION
To prevent possible damage to the compressor(s), do
NOT operate on cooling when outdoor temperature is
below 35°F (2°C).
NOTE: An optional low ambient kit is available that allows
the unit to operate at temperatures down to 0°F (-18°C).
1. Turn ON electric power.
2. Set thermostat to desired temperature and set system
switch to COOL. The unit will come on and operate au-
tomatically under control of the thermostat.
Close all doors and windows. The unit may run contin-
uously for several hours or longer on the initial run be-
cause of residual heat and moisture in the building.
This is normal for any air conditioning system.
Thermostat Fan Switch Operation
The circulating air blower will run continuously with the fan
selector switch in the ON position. When the fan selector
switch is in the AUTO position, the blower will run during
each heating or cooling cycle.
513 01 1002 00 r_
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