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Maintenance - Fall
CAUTION
Lock-out the gas and the electrical power to the
unit before performing any maintenance or service
operations to this unit.
High Limit
The high limit switch may have tripped over the
summer; it should be checked and reset if necessary.
Gas Line
Remove the drip leg and clean any liquid or debris
that may have accumulated. Once the drip leg is
cleaned, reattach it.
Gas Train
The gas connections, joints and valves should be
checked annually for tightness. Apply a soap and
water solution to all piping; watch for bubbling which
indicates a leak. Other leak testing methods can be
used.
Vent Piping
Remove any debris from the drip legs on the
combustion air and exhaust pipes.
Burners and Orifices
Before each heating season, examine the burners and
gas orifices to make sure they are clear of any debris
such as spider webs, etc. Clean burner as follows:
•Turnoffbothelectricalandgassuppliestotheunit.
•Disconnectunionbetweenmanifoldandgasvalve.
•Removemanifoldandburnerassembly.
•Inspectandcleanoricesandburnersas
necessary. Avoid using any hard or sharp
instruments which could cause damage to the
orifices or burners.
- Remove any soot deposits from the burner with
a wire brush.
- Clean the ports with an aerosol degreaser or
compressed air.
- Wipe the inside of the burner clean. Cleaning
the burner with a degreaser will slow the future
build-up of dirt.
•Beforereinstallingtheburnerassembly,lookdown
the heat exchanger tubes to make sure they are
clear of any debris.
•Reinstallmanifoldandburnerassembly,reconnect
wire leads and gas supply piping.
•Turnontheelectricalpowerandgassupply.
•Followthestart-upproceduretolighttheburners
and verify proper operation.
Heat Exchanger
The heat exchanger should be checked annually for
cracks. If a crack is detected, the heat exchanger
should be replaced before the unit is put back into
operation. Also, airflow across the heat exchanger
should be checked to make sure the blower is
operating properly.
Flue Collector Box
The flue passageway and flue collector box should be
inspected prior to each heating season and cleared of
any debris.
Electrical Wiring
The electrical wiring should be checked annually for
loose connections or deterioration.
Replacement Parts
When ordering replacement parts, include the
complete unit model number and serial number listed
on the unit nameplate.
Evaporative Coolers
The water should be shut off and all the lines drained
when the outside temperature drops below 45ºF.
Remove drain plugs for the winter.
Clean all interior parts of any mineral deposits or
foreign materials that may have built-up during the
cooling season.
Replace any worn or non-functioning parts.
Winterizing Chilled Water Coils
During the winter, chilled water coils need to be
protected against freezing. Manufacturer recommends
protecting the coils by either blowing-out the coils or
by flushing the coils.
Blowing-Out Coils
1. Close valves on the supply and return lines.
2. Open drain valves and/or drain plug. Remove
vent plug to allow coil to drain faster.
3. After coil is fully drained, connect a blower to the
caps. Do not connect the blower to the air vent
or drain plug.
4. Close the vent plug on the header that the blower
is connected to. Open the drain valve or cap on
the other header.
5. Turn on blower for 30 minutes. Place mirror at
discharge. If the mirror fogs up, repeat procedure
until no fog appears on the mirror.
6. After drying the coil, wait a few minutes then
repeat Step #5.
7. Leave drains open and do not install plugs until
beginning of cooling season.
®
Model IG / IGX Make-Up Air