Reznor R6GP Unit Installation Manual - Manual (Page 15)

15
Startup Procedures
WARNING:
This unit is equipped with crankcase heaters.
Allow 24 hrs for heating of the refrigerant
compressor crankcase prior to start up and
anytime the power has been removed for more
than 12 hrs. Failure to comply may result in
damage or cause premature failure of the
system.
• Check all electrical wiring for loose connections and
tighten as required.
• Check unit for return air filters and condensate trap.
• Close all electrical disconnects to energize the system .
Air Circulation
1. Set thermostat system switch to OFF and the fan switch
to ON.
2. Verify the blower motor runs continuously. Check for
air delivery at the register(s). Ensure that there are no
obstructions at the registers or in the ductwork.
3. Set thermostat fan switch to AUTO and verify the blower
shuts down immediately.
NOTE: If blower is turning opposite of arrow direction,
shut off main power to the unit and switch any two field
wires at the disconnect. DO NOT alter unit wiring.
System Cooling
1. Set the thermostat system switch to COOL and the fan
switch to AUTO.
2. Lower the thermostat temperature switch below
room temperature and observe that the blower, both
compressors and fans) energize.
3. Verify blower is turning in direction indicated by arrow
and air discharged at the register is cooler than room
temperature.
4. Verify HI and LO refrigerant pressures.
NOTE: If refrigerant pressures are abnormal and blower
is rotating in the opposite direction of the arrow, shut off
main power to the unit and switch any two field wires at
the disconnect. Ensure proper rotation of the blower. DO
NOT alter unit wiring. Listen for any unusual noises. Locate
the source and correct as needed.
5. Allow the unit to run for several minutes. Set the
temperature selector above room temperature and
verify that the fan, blower, and compressors cycle off
with the thermostat.
System Heating
1. Set the thermostat to the lowest setting.
2. Follow the startup procedures on this page or the
operating instruction label inside the louvered control
access panel.
3. Set the thermostat above room temperature and verify
the Operating Sequence (page 17).
4. Verify that the compressor and outdoor fan motor are
not energized.
5. Run the unit and after approximately five minutes, set
the thermostat below room temperature. Verify the
shutdown sequence (see Operating Sequence).
CAUTION
To avoid personal injury or property damage,
make certain that the motor leads do not make
contact with any uninsulated metal components
of the unit.
To change the blower speed:
1. Disconnect all electrical power to the unit and remove
the blower access panel.
2. Loosen the motor tension bars to allow removal of the
blower belt from the motor sheave.
3. Loosen top set screw on motor sheave and turn clockwise
to close (increases blower speed), or counterclockwise
to open (decreases blower speed).
4. Replace belt on pulleys and position motor mounting
plate to correct position for proper belt tension.
5. Tighten tension bar bolts.
STARTUP & ADJUSTMENTS
Pre-Start Check List
√
Verify unit is properly supported.
√
Verify unit is level for proper condensate drainage.
√
Verify all clearance requirements are met. Airflow to
and from the outdoor coil must be unrestricted.
√
Verify the ductwork is adequately sealed to prevent air
leakage. Insulate if necessary.
√
Verify the line voltage power leads are securely
connected and the unit is properly grounded.
√
Verify low voltage wires are securely connected to the
correct leads in the low voltage area of the control box.
√
Verify gas line pressure. For natural gas, the line pressure
must not exceed 10.0 inches WC (0.36 psig), or be less
than 5.5 inches WC (0.20 psig). For LP gas, the line
pressure must not exceed 14 inches WC (0.51 psig)
and must not be less than 11.0 inches WC (0.40 psig).
√
Verify the flame roll-out control is closed.
IMPORTANT NOTE: This safety device is a manually
reset switch. If necessary, press the red button to
reset the control. DO NOT install a jumper wire
across the control to defeat its function. If the
control reopens upon start-up, DO NOT reset the
control without identifying and correcting the fault
condition which caused the control to trip.
√
Verify the gas line has been purged and all connections
are adequately sealed. To check for gas leakage, see
Leak Check section on page 11.
√
Verify the indoor blower is properly set for the installation.
√
Verify the outdoor fan turns freely.
√
Verify the power supply branch circuit overcurrent
protection is properly sized.
√
Verify all exterior panels have been reinstalled and
securely fastened.
√
Verify the thermostat is wired correctly and preset for
initial operation. Set the thermostat system switch to
OFF and the fan switch to AUTO.