11
STARTUP & ADJUSTMENTS
Pre-Start Checklist
The following check list should be observed prior to
starting the unit.
√
Is the unit level? Unit should be level or slightly slanted
toward the drain for proper condensate drainage.
√
Is the unit installed with the proper clearances as listed
?
√
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?
Start-Up Procedure
The control circuit consists of an anti-short cycle timer
that will not let the compressor start at power up before
five 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 filter servicing.
Air Circulation
Leave the thermostat system mode on OFF, and set the
fan mode to ON. Blower should run continuously. Check
the air delivery at the supply registers and adjust register
openings for balanced air distribution. Examine ductwork
for leaks or obstruction if insufficient air is detected.
Set the thermostat fan mode to AUTO. The blower should
stop running.
System Heating
Set the thermostat system mode to HEAT and the fan mode
to AUTO. Change the thermostat temperature selector
above the existing room temperature and check for the
discharge of warm air at the supply registers.
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 system de-
energizes. Immediately lower the thermostat temperature
to the original setting and verify that the indoor blower is
energized. After approximately 5 minutes, the compressor
and the outdoor fan will energize.
Emergency Heat
1. Set the thermostat’s system mode to EM HT and the
fan mode to AUTO (intermittent air) or ON (continuous
air).
2. Set the thermostat’s temperature selector above the
existing room temperature and check the following:
• The thermostat auxiliary heat light (RED) is on.
• The AC compressor and the fan should not run; low
voltage circuit remains energized.
• The blower runs according to the thermostat’s fan
mode setting.
Adjustment of Refrigerant Charge
CAUTION:
This heat pump 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.
• The unit must be charged while both first and second
stages are operating.
• To achieve rated capacity and efficiency the compressor
must be exposed to refrigerant for at least 24 hours
prior to running and then must be run for a minimum of
12 hours. If Charging in Cooling Mode, see Refrigerant
Charging Charts:
, &
.
Charging the Unit in AC Mode
(with outdoor temperatures above 65
0
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.
• 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.
