Table of Contents
Advertisement
Start Up & adjUStmentS
pre-Start check list
√ 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 refrigerant tubing is properly connected
and leak checked.
√ Verify that the the unit is properly charged with the
refrigerant listed on the rating label.
√ 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.
√ Verify that the air filters are installed and clean.
Start-Up procedures
Warning:
if 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's function mode should be set to OFF and
the fan mode 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 insufficient 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 field wires at the
disconnect. do not alter unit wiring.
A n t i - S h o r t C y c l e T i m e r P r o t e c t i o n
(Single Phase Models Only)
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. note: Three phase
air conditioners DO NOT have short cycle protection.
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: On 3 phase models only - If refrigerant pressures
are abnormal and the compressor is rotating backwards,
shut off main power to the unit and switch any two field
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 mode is set to the ON position.
System Heating (optional)
1. Set the thermostat's system mode to HEAT and the
temperature mode above room temperature.
2. Verify the optional heating equipment (furnace or
electric heat) 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.
9
Advertisement
Table of Contents
