Nortek R8GE Series, Installation Instructions Manual

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CAUTION:
To prevent damage to the unit or internal components,
it is recommended that two wrenches be used when
loosening or tightening nuts. Do not over tighten!
6. Using two wrenches, separate the ground-joint union in the
gas supply piping at the unit.
7. Remove the piping between the gas valve and the ground-
joint union (if applicable).
8. Remove all screws securing the burner assembly to the
furnace.
9. Carefully remove the burner assembly from the furnace.
DO NOT DAMAGE THE IGNITER WHILE REMOVING
THE BURNER ASSEMBLY.
10. Inspect the burners for accumulated dust or debris. If
necessary carefully clean them with a soft wire brush and
a vacuum cleaner. DO NOT DAMAGE THE IGNITER
WHILE CLEANING THE BURNER.
11. Replace all the parts in reverse order from which they were
removed.
12. Follow the lighting instructions found on the lower unit door
to return the unit to operation.
13. Verify proper operation after servicing.
REPLACEMENT PARTS
Replacement parts are available through your distributor.
Please have the complete model and serial number of the
unit when ordering replacement parts.
ELECTRICAL:
• Capacitors • Pressure Switches
• Compressors • Relays
• Contactors • Temperature Limit Switches
• Gas Valves • Thermostats
• Ignition Controls • Time Delay Relays
• Ignitors/Flame Sensors • Transformers
MOTORS:
• Blower Motor
• Fan Motor
• Inducer Blower Motor
COMPONENTS:
• Blower Assembly • Fan Grille
• Burner Manifold • Filter/Driers
• Burners/Orifices • Gaskets
• Cabinet Panels • Heat Exchanger
• Expansion Valves
COMPONENT FUNCTIONS
Flame Roll-Out Control - Verifies that the burner flame is
being drawn into the heat exchanger tubes. If the burner flame
is not being drawn into the heat exchanger tubes, the roll-out
control will open within several seconds and the integrated
control diagnostic light will flash one time. The circulating air
blower and combustion blower will continue to operate if the
flame roll-out control opens.
Flame Sensor - Proves that flame has carried over from the
ignitor to the right-most burner. If no flame is sensed, the unit
will be shut down automatically.
Table 8. Diagnostic Codes
STATUS LIGHT
(RED LED)
FAULT CONDITION
On Power On
1 Flash Limit Circuit Open
2 Flashes Pressure Switch Stuck Open
3 Flashes Pressure Switch Stuck Closed
4 Flashes Ignition Failure (Check Ground)
5 Flashes 230 VAC & Neutral Reversed or no ground
Continuous Flash False Flame or Gas Relay Shorted
Off Power Off
STATUS LIGHT
(YELLOW LED)
FAULT CONDITION
Continuous Flash Low Flame Sensor Signal
On Flame Present
Gas Valve
- controls the flow of gas to the burners in both low
and high fire. When the gas valve is energized it automatically
opens and regulates the gas pressure in the manifold.
Pressure Switch
- Verifies that the inducer motor is drawing
the combustion gases through the heat exchanger tubes and
venting the gases through the vent system.
Over-Temperature Limit Control
- Prevents the air
temperature leaving the unit from exceeding the maximum
outlet air temperature. If the limit opens, the integrated control
diagnostic will flash one time. The circulating air blower
and combustion blower will continue to operate if the over-
temperature limit control opens.
TROUBLESHOOTING
If the unit does not operate in the cooling mode, check the
following:
• The thermostat is operating properly
• Electrical power to the unit is turned on
• The filters are not dirty
• The service doors are in place
• The 3 amp fuse is operational
If the unit does not operate in the heating mode, check the
following:
• The thermostat is operating properly
• Electrical power to the unit is turned on
• The filters are not dirty
• The gas is turned on and the manual shut-off valve is open
• The service doors are in place
• The flame roll-out control is closed
• The diagnostic codes listed in Table 8 or on the wiring
diagrams ( Figure 11 (page 25) or Figure 12 (page 26) ).
• The 5 amp fuse is operational