Reznor R6GN Unit Installation Manual - Manual (Page 17)

17
Air Circulation
1. Set the thermostat 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 & 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 19).
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 (steps 7 - 8 of the Operating Sequence).
Verifying & Adjusting Temperature Rise
Verify the temperature rise through the unit is within the
range specified on the unit data label. Temperature rises
outside the specified range could result in premature heat
exchanger failure.
1. Place thermometers in the return and supply air stream
as close to the unit as possible. The thermometer on the
supply air side must be shielded against direct radiation
from the heat exchanger to avoid false readings.
2. Adjust all registers and duct dampers to the desired
position. Run the unit for 10 to 15 minutes before
taking any temperature readings. The temperature
rise is the difference between the supply and return
air temperatures.
NotE: For typical duct systems, the temperature rise will
fall within the range specified on the data label (with the
blower speed at the factory recommended setting) shown
in Table 11, page 34. If the measured temperature rise falls
outside the specified range, it may be necessary to change
the blower speed. Lowering the blower speed increases
the temperature rise and a higher speed decreases the
temperature rise.
The unit is equipped with a belt driven blower and variable
pitch motor sheave. The selection of a sheave setting
should be based on the desired CFM and the duct system
parameters. Refer to the ACCA’s Manual Q for a complete
description of how to determine these parameters and
Manual N for determination of the commercial load
requirements. The blower performance data can be found
in Tables 4 & 5 (pages 26 & 27).
The integrated control is designed to start the circulating
air blower approximately 40 seconds after the gas valve
opens and turn the blower motor off approximately 150
seconds after the gas valve is closed.
Verifying Burner Operation
WaRNING:
Uninsulated live components are exposed when
the louvered control access panel is removed.
1. Remove the louvered control access panel to ensure
there is power to the unit.
2. Set the thermostat above room temperature and observe
the ignition sequence. The burner flame should carry
over immediately between all burners and should extend
from each burner without lifting off, curling, or floating.
The flames should be blue, without yellow tips.
3. After verifying flame characteristics, set the thermostat
below room temperature and verify that the burner flame
extinguishes completely.
Verifying Operation of Over-Temperature
Limit Control
To verify operation of the over-temperature limit control,
make sure the louvered control access panel is in place
and that there is power to the unit.
1. Block the return airflow to the unit by installing a close-
off plate in place of or upstream of the filter.
2. Set the thermostat above room temperature and verify
the unit operates with the correct sequence of operation,
See Operating Sequence on page 19.
NotE: The over-temperature limit control should function
to turn off the gas valve within approximately four minutes
(exact time depends on the efficiency of the close-off when
blocking the return air). The circulating air and combustion