Maintenance - Modine Manufacturing IFS Installation And Service Manual

MAINTENANCE

WARNING
1. Installing, starting up and servicing heating, ventilation and
air conditioning equipment poses significant hazards and
requires specialized knowledge of Modine products and
training in performing those services. Failure to have any
service properly performed by, or making any modification
to Modine equipment without the use of, qualified service
personnel could result in serious injury to person and
property, including death. Therefore, only qualified service
personnel should work on any Modine products.
2. When servicing or repairing this equipment, use only
factory-approved service replacement parts. A complete
replacement parts list may be obtained by contacting
Modine Manufacturing Company. Refer to the rating plate
on the appliance for complete appliance model number,
serial number, and company address. Any substitution of
parts or controls not approved by the factory will be at the
owner's risk.
CAUTION
Do not attempt to reuse any mechanical or electrical controller
which has been wet. Replace defective controller.
IMPORTANT
To check most of the Possible Remedies in the troubleshooting
guide listed in Table 24.1, refer to the applicable sections of
the manual.
All heating equipment should be serviced before each heating
season to assure proper operations. The following items may
be required to have more frequent service schedule based on
the environment in which the unit is installed, and the frequency
of the equipment operation.
Before any service, BE SURE TO TURN OFF GAS AT THE
MANUAL SHUT-OFF VALVE AHEAD OF THE COMBINATION
GAS CONTROL AND TURN OFF ALL ELECTRIC POWER TO
THE HEATER AND AIR MOVING SYSTEM.
Blower Assembly
The blower assembly includes the bearings, drive sheaves and
belts.
Blower bearings should be checked and lubricated based on
the blower manufacturer's recommendations. Bearings should
also be checked for any unusual wear and replaced if needed.
Drive sheaves should be checked at the same time the bearings
are inspected. Check to make sure the sheaves are in alignment
and are securely fastened to the blower and motor shafts.
Belt tension should be rechecked shortly after the unit has been
installed to check for belt stretching. After the initial start-up,
monthly checks are recommended.
Filters
If the unit is supplied with a dirty filter switch and light, clean or
replace the filters any time the dirty filter light comes on.
Units which do not have a dirty filter warning light should have
the filters checked monthly. Clean or replace if necessary. In
dirty atmospheres, filter maintenance may be required more
often.
22
Duct Furnace
When providing annual maintenance for the duct furnace, keep
the unit free from dust, dirt, grease and foreign matter. Pay
particular attention to:
1. The combustion air and exhaust vent piping.
2. The burner ports and pilot burner orifices (avoid the use of
hard, sharp instruments capable of damaging surfaces for
cleaning these ports). To check the burner port and pilot
burner orifice, see Burner and Pilot Assembly Removal.
3. The air shutters and main burner orifices (avoid the use of
hard, sharp instruments capable of damaging surfaces for
cleaning these orifices). To check the air shutters and main
burner orifices, see for Manifold Assembly Removal.
The heat exchanger should be checked annually for cracks
and discoloration of the tubes. If a crack is detected, the heat
exchanger should be replaced before the unit is put back into
service. If the tubes are dark gray, airflow across the heat
exchanger should be checked to insure that a blockage has not
occurred or the blower is operating properly.
Electrical Wiring
The electrical wiring should be checked annually for loose
connections or deteriorated insulation.
Gas Piping & Controls
The gas valves and piping should be checked annually for
general cleanliness and tightness.
The gas controls should be checked to insure that the unit is
operating properly.
Manifold Assembly Removal
To remove the manifold (refer to Figure 23.1)
1. Shut off gas and electric supply.
2. Remove the burner side access panel.
3. Disconnect gas manifold at ground union joint.
4. Remove the two screws holding the manifold to the heat
exchanger support.
5. Slide the manifold through the manifold bracket.
6. Clean the orifices and adjust the air shutters as necessary.
7. Follow steps 3-6 in reverse order to install the manifold
assembly.
8. Turn on the electric and gas supply.
9. Check the ground union joint for leaks with a soap solution.
Tighten if necessary.
10. Install the burner side access panel.
AIR 5-593.9