548267-YIM-C-0211
Unitary Products Group
13
Figure 12: Switch Installation
Pre-start Procedure
Before starting air conditioner, make sure of the following:
1.
The unit is properly located and level.
2.
The ductwork is properly sized, insulated, weather proofed
and correctly spaced from combustible materials.
3.
Air is free to flow to and from outdoor coil.
4.
All wiring is correct, tight and according to the wiring
diagrams.
5.
The unit is properly grounded electrically.
6.
The condensate drain is connected and directed away from
the unit and structure.
7.
The outdoor fan and indoor blower wheel will turn freely.
8.
The indoor blower is factory wired to provide the correct
speed.
System Startup, Check-out
1.
Insure that all access doors are in position. The wall
thermostat system switch should be in the OFF position,
the fan switch in the AUTO position and the emergency
heat switch in the NORM position.
2.
The electrical power supply to the heat pump should be on
for 12 hours and the compressor crankcase heater (if
provided) is working.
3.
Set the wall thermostat fan switch to ON. The outdoor
blower should run.
4.
Set wall thermostat fan switch to AUTO. The indoor blower
should not run.
5.
Set the wall thermostat system switch to COOL and the
temperature selection lever below the room temperature.
The heat pump should be running in the cooling mode.
6.
Set the wall thermostat system switch to the HEAT
position. The heat pump should stop.
7.
Raise the wall thermostat temperature selection lever to a
setting above the room temperature. The heat pump
should now run in the heating mode.
8.
To check the emergency heat operation, set the wall
thermostat system switch to EMERGENCY HEAT. Raise
the wall thermostat temperature selection lever high
enough to close the second stage of the thermostat, if it is
not already closed. The indoor blower will turn on when the
heating elements stage on. If accessory heaters are not
installed, the blower will not run.
9.
Set the wall thermostat to the seasonal mode of operation
(heat or cool), adjust the temperature selection lever to the
desired setting. Record the following information for your
service records after the heat pump has run for 20 minutes:
• Operating Mode ____________________________
• Discharge Pressure ________________________
• Suction Pressure __________________________
• Suction Line Temp. at Compressor ____________
• Indoor Dry Bulb Temperature _________________
• Indoor Wet Bulb Temperature _________________
• Outdoor Dry Bulb Temperature ________________
• Outdoor Wet Bulb Temperature ________________
• Voltage at Contactor _________________________
• Current at Contactor _________________________
• Model Number _____________________________
• Serial Number _____________________________
• Owner ___________________________________
• Date _____________________________________
10. Reinstall all panels on the heat pump.
11. Check the heat pump system for tubing and sheet metal
rattles.
12. Instruct the owner on the operation and maintenance of
this heat pump system.
13. Give the Customer Envelope to the owner and explain why
the registration card should be filled out and returned.
Other Features Incorporated In The Control
Anti-Short Cycle time Delay
Five minute duration, activated each time the indoor thermostat
opens and each time the system is turned on. This delay may
be reduced by a ratio of 256:1 by shorting the “TEST" posts.
Safety Lock-Out
This device opens the circuit to the compressor contactor in
response to High Pressure Limit switch opening. The
compressor will remain off, even though the limit switches close
and will start up only when the Lock-out is reset.
The Lock-out also lights the Emergency Heat Indicator. To
reset the Lock-out momentarily turn the thermostat to “OFF"
then back to its original position. The unit will start up after the 5
minute delay, mentioned above.
Cooling
Thermostat
Heating
Thermostat
To Furnace
Control Circuit
To Air Conditioner
Control Circuit
Double Pole
Double Throw Switch
