Reznor R6GN Unit Installation Manual - Manual (Page 21)

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12. Follow the operating instructions printed on the units
gas valve label or Figure 17 (page 35) to return the
unit to normal operation. Verify proper operation after
servicing.
Cleaning the Heat Exchanger
If the heat exchanger must be cleaned due to soot or
scale build up, follow the steps below.
1. Shut off the gas supply to the unit either at the meter
or at the manual valve in the gas supply piping.
IMPoRtaNt NotE! See gas valve label on the unit or
Figure 17 (page 35) for proper gas shutdown instructions.
2. Turn off all power to the unit and set the thermostat to
the lowest temperature setting.
cautIoN:
Label all wires prior to disconnection when
servicing the unit. Wiring errors can cause
improper and dangerous operation.
3. Disconnect the wires from the gas valve, ignitor, flame
sensor, and rollout switch.
4. Using two wrenches, separate the ground-joint union
in the gas supply piping at the unit.
5. Remove the piping between the gas valve and the
ground-joint union.
6. Remove the four screws securing the burner assembly
to the unit.
7. Carefully remove the burner assembly from the unit.
DO NOT DAMAGE THE IGNITOR OR FLAME SENSOR
WHILE REMOVING THE BURNER ASSEMBLY.
8. Remove three nuts securing the combustion blower to
the collector pan.
9. Remove the combustion blower from the unit.
10. Remove the screws securing the collector pan cover
to the unit. Remove the cover plate.
11. Attach a round wire brush to a length of high grade
stainless steel cable, such as drain cleanout cable.
Attach the other end of the spring cable to a variable
speed reversible drill. Slowly insert and rotate the cable
into the top portion of the heat exchanger. Operate the
drill alternating between forward and reverse, working
the cable in and out several times to obtain sufficient
cleaning. Repeat this sequence for each heat exchanger
tube.
12. Remove all loosened debris from the heat exchanger
tubes using high pressure air and vacuum cleaner.
13. Using a light, check the condition of the upper and
lower sections of the heat exchanger tube.
14. Inspect the burners and if necessary, clean them
carefully with a soft wire brush and/or the nozzle of a
vacuum cleaner. Do Not DaMaGE tHE IGNItoR oR
FlaME SENSoR WHIlE clEaNING tHE BuRNER.
15. Replace all the parts in reverse order from which they
were removed. NotE: If screws or other hardware are
corroded, replace only with corrosion resistant stainless
steel hardware of similar design.
16. Follow the operating instructions printed on the units
gas valve label or Figure 17 (page 35) to return the
unit to normal operation. Verify proper operation after
servicing.
Removal of Unit Top Pan
cautIoN:
Routine maintenance of this equipment does not
require removal of the unit top pan. If service is
needed which requires removal of the unit top
pan, only qualified service personnel should
perform this procedure.
If removed, all cleaning and inspections of blower drive,
coils, condensate drain pan, etc., should be performed
while the top is off. Follow the steps below for top pan
removal and replacement:
1. TURN OFF ALL ELECTRICAL POWER TO THE UNIT.
2. Remove all water tight screws securing the top and
save for later use.
3. Carefully lift top pan from unit and rest on end. Do not
allow top to kink or bend during removal.
4. Upon completion of service, inspect the unit top pan
to ensure the insulation has not been damaged and is
secured in place. Also inspect the gaskets located on
each front corner of the unit top for damage. Replace
if necessary to ensure a water tight seal. Secure the
top pan with all screws removed in Step 2 to seal out
water. Replace any worn or damaged screws “ONLY’
with water tight screws or rubber washers.
REPlacEMENt PaRtS
Replacement parts are available through all Nordyne
distributors. 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