12
START UP & ADJUSTMENTS
Pre-Start Check List
Verify the unit is level and allows condensate to drain.
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 duct work is sealed to prevent air leakage.
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.
The thermostat function switch should be set to OFF and
the thermostat fan switch should be set to AUTO. Close
all electrical disconnects to energize the system.
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 insuffi cient
air is detected, examine ductwork for leaks or
obstructions.
3. Set the thermostat fan mode to AUTO and verify the
blower stops running.
NOTE:
On 3 phase air handler models only - If blower
is spinning opposite of arrow direction, shut off the
main power to the unit and switch any two fi eld wires
at the disconnect.
DO NOT alter unit wiring.
Short Cycle Protection
1. Set the thermostat system mode to COOL. Note 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 compressor
and fan energize 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.
NOTE:
If refrigerant pressures are abnormal and
the compressor is rotating backwards, shut off main
power to the unit and switch any two fi eld wires at
the disconnect.
DO NOT alter unit wiring.
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.
Refrigerant Charging
WARNING:
T5BP Split System Heat Pumps leave the factory
with a 90 oz. (5.63 Lbs.) R410A refrigerant holding
charge. Follow these charging instructions for
maximum unit performance and effi ciency. Some
local codes require licensed installation/service
personnel to service this type of equipment.
Refrigerant charging must be done by qualifi ed
personnel familiar with safe and environmentally
responsible refrigerant handling procedures.
Under no circumstances should the owner
attempt to install and/or service this equipment.
Failure to comply with this warning could result
in property damage, personal injury, or death.
