Reznor PDF2SF Unit Installation Manual - Manual (Page 23)

23
CAUTION:
The unit should never be operated without a
filter in the return air system. Replace disposable
filters with the same type and size.
• Inspect, clean or replace air filters at the beginning of
each heating and cooling season, or more frequently
if required.
• Inspect the condensate drain and outdoor coil at the
beginning of each cooling season. Remove any debris.
Clean the outdoor coil and louvers as necessary using
a mild detergent and water. Rinse thoroughly with water.
• Inspect the electrical connections for tightness at the
beginning of each heating and cooling season.
• The blower compartment should be cleaned monthly
during the heating and cooling seasons to remove
any dirt and lint that may have accumulated in the
compartment or on the blower and motor. Buildup
of dirt and lint on the blower and motor can create
excessive loads on the motor resulting in higher than
normal operating temperatures and possible shortened
service life.
• Maintain heat exchanger and burners. The unit should
operate for many years without excessive scale buildup
in the heat exchanger, however, the heat exchanger,
the vent system, and the burners should be inspected
and cleaned (if required) by a qualified serviceman
annually to ensure continued safe operation. Particular
attention must be given to identify deterioration from
corrosion or other sources.
• The motors for the circulating air blower, outdoor fan,
and combustion blower are pre-lubricated at the factory.
No further oiling is required for the life of this product.
• Inspect and clean the screen of the vent cover assembly
at the beginning of each heating and cooling season.
Cleaning of Heat Exchanger
WARNING:
Holes in the heat exchanger can cause products
of combustion to enter the home. Replace the
heat exchanger if leaks are found. Failure to
prevent products of combustion from being
circulated into the living space can create
potentially hazardous conditions including
carbon monoxide poisoning that could result
in personal injury or death.
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 at the meter or at the
manual valve in the gas supply piping.
2. Turn off all power to the unit and set the thermostat to
the lowest temperature setting.
3. Remove the louvered access panel from the unit.
4. Turn the gas control knob (gas valve) to the OFF
position. See Figure 12 (page 29) for gas valve shut
off instructions.
5. Disconnect the wires from the gas valve, ignitor, flame
sensor, combustion air motor, flame roll-out control,
over-temperature limit switch, and pressure switch.
6. Remove the silicone rubber tube from the collector pan
to the pressure switch.
7. Remove 4 nuts securing the combustion blower to the
collector pan. Remove the combustion blower.
8. Remove all screws securing the collector pan to the
unit. Remove the collector pan from the unit.
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!
9. Using 2 wrenches, separate the ground-joint union in
the gas supply piping at the unit.
10. Remove the piping between the gas valve and the
ground-joint union, if necessary.
11. Remove the screws that secure the burner assembly
in place and the burner assembly. BE EXTREMELY
CAREFUL NOT TO DAMAGE THE IGNITOR WHILE
REMOVING THE BURNER ASSEMBLY.
12. Attach a round wire brush to a length of high grade
stainless steel cable, such as drain clean-out 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 process at each exchanger tube.
13. Remove all loosened debris from the heat exchanger
tubes using high pressure air and vacuum cleaner.
14. Using a light, check the condition of the upper and
lower sections of the heat exchanger tube.
15. 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.
16. Replace all the parts in reverse order from which they
were removed.
17. Follow the operating instructions found on the right
side door and the User’s Information Manual to return
the unit to operation.