7
START UP & ADJUSTMENTS
Pre-Start Check List
√
Verify the unit is level and has sufficient clearances for
unobstructed airflow.
√
Verify the outdoor coil and top of the unit are free from
obstructions and debris, and all equipment access/control
panels are in place.
√
Verify that the line voltage power leads are securely
connected and the unit is properly grounded.
√
Verify that 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.
√
Verify that the thermostat is wired correctly.
Start-Up Procedures
WARNING:
This unit is equipped with a crankcase heater.
Allow 24 hours prior to continuing the start up
procedures to allow for heating of the refrigerant
compressor crankcase. Failure to comply may
result in damage and could cause premature
failure of the system. This warning should be
followed at initial start up and any time the power
has been removed for 12 hours or longer.
Operating Temperatures
This equipment has been designed to operate within the
temperatures specified in
. Running the equipment
in heating at higher than 70°F may require the use of a
Heat Pump Mild Weather Control Kit or changing over to
emergency or auxiliary heating.
Air Circulation - Indoor Blower
1. Set the thermostat system mode on OFF and the fan mode
to ON.
2. Verify the blower runs continuously. Check the air delivery
at the supply registers and adjust register openings for
balanced air distribution. If insufficient air is detected,
examine ductwork for leaks or obstructions.
3. Set the thermostat fan mode to AUTO and verify the blower
stops running.
Short Cycle Protection
1. Set the thermostat system mode to COOL. Observe the
temperature setting of the thermostat and gradually raise
the set-point temperature until the unit de-energizes.
2. Immediately lower the set point temperature of the
thermostat to its original setting and verify that the indoor
blower is energized and outdoor unit remains de-energized.
3. After approximately 5 minutes, verify the outdoor unit
energizes and the temperature of the discharge air is
cooler than the room temperature.
System Cooling
1. Set the thermostat’s system mode to COOL and the fan
mode to AUTO. Gradually lower the thermostat temperature
setpoint below room temperature and verify the outdoor
unit and indoor blower energize.
2. Verify blower wheel is spinning in direction indicated by
arrow. Feel the air being circulated by the indoor blower
and verify that it is cooler than ambient temperature. Listen
for any unusual noises. If unusual sounds occur, determine
the source of the noise and correct as necessary.
3. Verify HI and LO refrigerant pressures.
4. Allow the system to operate for several minutes and then
set the temperature selector above room temperature.
Verify the fan and compressor cycle off with the thermostat.
NOTE:
The blower should also stop unless fan switch is
set to the ON position.
System Heating
1. Set the thermostat's system mode to HEAT and the
temperature mode to below room temperature.
2. Verify the outdoor unit and indoor fan stop running. After
5 minutes, increase the temperature on the thermostat to
it's maximum setting.
3. Verify the outdoor unit and indoor blower energize. Feel
the air being circulated by the indoor blower and verify
that it is warmer than ambient temperature. Listen for any
unusual noises. If unusual sounds occur, determine the
source of the noise and correct as necessary.
Defrost Control Board Test Pins
• Placing a jumper between the test pins for less than 1
second will bypass the Anti-Short Cycle Timer.
• Placing a jumper between the test pins for more than 1
second will force the unit into a defrost cycle. As soon
as the jumper is removed, the defrost cycle will end as
determined by the typical criteria.
• Verify the Status Indicator (on the control board) against
to determine proper diagnostic
description.
Table 3. Heat Pump Operating Temperatures
COOLING
HEATING
MIN (° F)
MAX (° F)
MIN (° F)
MAX (° F)
60
115
-10
70
STATUS
INDICATOR
STATUS
TYPE
DIAGNOSTIC
DESCRIPTION
C1
Operating Status
Cooling, 1st Stage
C2
Operating Status
Cooling, 2nd Stage
H1
Operating Status
Heating, 1st Stage
H2
Operating Status
Heating, 2nd Stage
SC
Operating Status
Anti Short Cycle Timer
OF
Operating Status
Defrost
_.
Operating Status
Power on, no call for operation
01
Fault
Pressure switch, low
02
Fault
Pressure switch, high
03
Fault
Temperature Sensor, Ambient
04
Fault
Temperature Sensor, Coil
05
Fault
Board
OF
(FLASHING)
Input Error
Forced defrost - test short applied
longer than 11 minutes
Table 4. Defrost Control Board Status Indicators
