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LG/KG - Install New Heat Exchanger
1- Install replacement heat exchanger. Lift the back of
the heat exchanger over the supports and push
toward the back of the unit. Make sure tubes are
secure in the support and the vestibule panel is tight
against the opening frame. Secure with 11 retained
screws.
2- Install the combustion air inducer gasket, provided in
this kit, and the previously removed combustion air
blower.
3- Reinstall vent connector.
4- LGH/KG Units -
Remove the two screws and patch plate covering the
primary limit opening and discard.
LGM Units -
Do NOT remove the patch plate. This plate must
be left in place.
5- Reinstall combustion air blower prove switch with
retained screws. If damaged, install a new
field-provided switch. Reinstall combustion air
inducer air tubing.
6- Reinstall burner box assembly.
7- Reinstall J19 in division panel and connect P19.
8- Reconnect all wires and secure away from other
components with wire ties. Reconnect all piping and
mullions.
9- Check for gas leaks at gas connections.
10- Start unit blower according to unit installation
instructions. Check for air leaks out of the gas heat
area. Use high temperature RTV or mastic seals to
seal any air leaking out of the gas heat compartment.
11- Start
heating
instructions. Check for proper operation of gas heat
using lighting sequence provided in the unit
installation instructions or lighting instruction label
provided on unit.
12- In downflow applications remove the horizontal
return air panel. This will prevent a slight amount of
smoke from entering the building due to the residual
manufacturing process lubrication on the surface of
the heat exchanger. In horizontal airflow applications,
inform building occupants there may be a slight
amount of smoke entering the building.
13- Dispose of packing materials and replaced heat
exchanger properly.
Page 4
according
to
unit
installation
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