9
Figure 9. Low Voltage Connections
connections and proper heat anticipator setting when
installing unit with an external furnace.
SYSTEM OPERATION
1. PRE-START CHECK LIST
The following check list should be observed prior to starting
the unit.
Is the unit level? It should be level or slightly slanted
toward the drain for proper condensate drainage.
Is there free air flow to and from the condenser? A one
foot clearance around the coil, and six foot clearance
above the fan?
Is the wiring correct according to the wiring diagram and
electrical codes?
Are all the wiring connections tight? Check the condenser
fan to make sure it turns freely.
Is the overcurrent protection properly sized?
Is the thermostat wired correctly? Is it installed in a
proper location?
2. START-UP PROCEDURE
a. Set the system switch to the OFF position.
b. Dial thermostat setting as high as it will go.
c. Turn on power supply at the disconnect switch.
d. Set the system switch to ON or COOL. Set the temperature
setting to below room temperature. Verify that the indoor
blower is energized and that the compressor and outdoor
fan are operating.
e. Verify that the discharge air grilles are adjusted and the
system is balanced.
f. Verify that there are no air leaks in the duct work.
g. Verify that the condensate drain is properly installed and
that it functions correctly.
h. Dial the thermostat higher than room temperature. The
unit should stop.
i. If using a combination heating-cooling thermostat, set to
the HEAT position. Proceed to check for correct furnace
operation.
j. Verify that the furnace controls and burners or heating
elements operate correctly.
k. Instruct the owner on unit operation, filter servicing, and
proper thermostat operation.
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