10
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 shown in
√
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.
√
To achieve rated capacity and efficiency the compressor
must be exposed to refrigerant for at least 24 hours prior
to running. After unit startup, the compressor must run
for a minimum of 12 hours.
Start-Up Procedure
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 filter servicing.
System Cooling
Set the thermostat’s system mode to COOL and the fan
mode to AUTO. Lower 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.
System Heating
(Available only when Electric heat is supplied) Set the
thermostat’s system mode to HEAT and the fan mode to
either AUTO (intermittent air) or to ON (continuous air).
Raise the thermostat’s temperature selector above the
existing room temperature and check the following:
1. The compressor and outdoor fan should not run.
2. The blower will run according to the thermostat’s fan
mode setting.
charging the Unit in ac Mode
(with Outdoor Temperatures Above 55° F)
caUtion:
this air conditioner contains liquid and gaseous
refrigerant under pressure. adjustment of
refrigerant charge should only be attempted
by qualified, 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.
note:
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.
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
• If the pressure measured in step 1 is greater than the
required liquid refrigerant pressure determined in step
3, 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
3, then there is too little charge in the system. Add
refrigerant and repeat steps 1 through 3 until the system
is correctly charged.
Safety switches
The high-pressure switch is factory-installed and located
in the liquid line internal to the unit. The switch is designed
to protect the system when very high pressures occur
during abnormal conditions. Under normal conditions,
the switch is closed. If the liquid pressure rises above
650 psig, the switch will open and de-energize the unit.
The switch will close again when the liquid pressure
decreases to 460 psig.
