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START UP & ADJUSTMENTS
Pre-Start Checklist
The following check list should be observed prior to
starting the unit.
Verify the unit is level and allows proper condensate
drainage.
Verify the outdoor coil and top of the unit are free from
obstructions and debris, and all equipment access/
control panels are in place. Unit must be installed with
the proper clearances as listed in Figure 2 (page 5).
Verify that the duct work is sealed to prevent air leakage.
Verify that the line voltage power leads are securely
connected and the unit is properly grounded. Check
the condenser fan to make sure it turns freely.
Verify the thermostat is wired correctly and installed
in a proper location. Make sure the low voltage wires
are securely connected to the correct leads on the low
voltage terminal strip.
Verify that the power supply branch circuit overcurrent
protection is sized properly.
Start-Up Procedure
The control circuit consists of an anti-short cycle timer
that will not let the compressor re-start before three (3)
minutes have elapsed.
1. Set the system mode to OFF and the temperature
mode to its highest setting.
2. Turn power on at the disconnect switch.
3. Set the system mode to ON or COOL.
4. Set the temperature mode below room temperature.
Verify that the indoor blower, outdoor fan, and
compressor energize and the cooling function starts.
5. Verify the discharge air grilles are adjusted and the
system air is balanced.
6. Verify the duct work has no air leaks.
7. Verify the condensate drain is installed correctly and
functions properly.
8. Set the temperature mode above room temperature.
The unit should stop.
9. Instruct the homeowner on unit and thermostat operation
and fi lter servicing.
System Cooling
Set the thermostat's system mode to COOL and the
fan mode to AUTO. Change the thermostat temperature
selector below the existing room temperature. Allow the
cooling system to operate for several minutes and check
for the discharge of cool air at the supply registers.
Short Cycle Protection
The control circuit is equipped with a time-delay feature
for protection against short cycling. With the system
operating in the cooling mode, gradually raise the
thermostat temperature setting until the whole system de-
energizes. Immediately lower the thermostat temperature
to the original setting and verify that the indoor blower is
energized. After approximately 3 minutes the compressor
and the outdoor fan will energize.
Emergency Heat
(Available only when Electric heat is supplied) Set the
thermostat's system mode to EM HT and the fan mode
to either AUTO (intermittent air) or to ON (continuous air).
Change the thermostat's temperature selector above the
existing room temperature and check the following:
1. The thermostat auxiliary heat light (RED) should be
on.
2. The compressor and fan should not run; low voltage
circuit remains energized.
3. The blower will run according to the thermostat's fan
mode setting.
Adjustment of Refrigerant Charge:
CAUTION:
This air conditioner contains liquid and gaseous
refrigerant under pressure. Adjustment of
refrigerant charge should only be attempted
by qualifi ed, trained personnel thoroughly
familiar with the equipment and safe responsible
refrigerant handling procedures. Under no
circumstances should the homeowner attempt
to install and/or service this equipment. Failure
to comply with this warning could result in
equipment damage, personal injury, or death.
• To achieve rated capacity and effi ciency the compressor
must be exposed to refrigerant for at least 24 hours
prior to running and then the compressor must be run
for a minimum of 12 hours.
• The refrigerant charge can be checked and adjusted
through the service ports provided external to the
unit. Use only gage line sets which have a "Schrader"
depression device present to actuate the valve.
Charging an R-410A Unit in AC Mode with Outdoor
Temperatures Above 55° F
1. With the system operating at steady-state, measure
the liquid refrigerant pressure in psig at the service
valve.
2. Measure the liquid refrigerant temperature (° F) at the
service valve.
3. For the temperature measured, determine the required
liquid refrigerant pressure from the appropriate charging
charts (Table 6 - 11, pages 16 - 18).
• If the pressure measured in step 1 is greater than
the required liquid refrigerant pressure determined in
step 4, then there is too much charge in the system.
Remove refrigerant and repeat steps 1 through 3 until
the system is correctly charged.
• If the pressure measured in step 1 is less than the
required liquid refrigerant pressure determined in
step 4, then there is too little charge in the system.
Add refrigerant and repeat steps 1 through 3 until the
system is correctly charged.
11
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