PART-SVN114A-EN
5
Replacement Procedure
1.
Shut off all electrical power to unit.
2. Shut off and disconnect gas service to unit.
3. Disconnect any piping from unit condensate drain.
4. Remove all access panels, front center posts, and rear
duct cover. If the unit is configured for horizontal
supply, remove the connecting ductwork.
5. Remove condensate drain pan.
6. Clip any wire ties that secure wires to one another in
the gas heat compartment. Be careful not to damage
any wiring when doing this.
7.
Disconnect wires from the various components in the
gas heat compartment (TCO1, Pressure Switch, Gas
Valve, etc.).
8. Route wires out of gas heat compartment through
plastic grommet on the right side of the compartment.
Be sure NOT to discard the foam insulation that is used
to plug this hole.
9. Remove smaller plastic grommet on the right side of
the gas heat compartment. This is the opening where
the high voltage spark ignition wire is routed through.
Remove this wire as well.
10. Disconnect the orange pressure switch hose from the
pressure switch.
11. Remove the gas valve and burner assembly by
removing the four screws shown in
.
12. Remove TCO1 limit and turbulators shown in
.
13. Remove the inducer motor shown in
. If the
gasket behind the part is damaged, replace with the
new gasket provided in the kit.
14. Remove the air orifice. Please note that when installing
the new heat exchanger, this air orifice plate may need
to be changed out, depending on the unit (refer to
).
15. Remove the screws shown in
to take out the
collector cover. Note that these screws are longer than
the other screws in the unit. Set these aside and do not
mix them in with other screws.
WARNING
Hazardous Voltage and Gas!
Failure to turn off gas or disconnect power before
servicing could result in an explosion or electrocution
which could result in death or serious injury. Turn off
the gas supply and disconnect all electric power,
including remote disconnects, before servicing the unit.
Follow proper lockout/tagout procedures to ensure the
power can not be inadvertently energized.
WARNING
Hazardous Gases and Flammable Vapors!
Failure to observe following instructions could result in
death or serious injury. Exposure to hazardous gases
from fuel substances have been shown to cause cancer,
birth defects or other reproductive harm. Improper
installation, adjustment, alteration, service or use of
this product could cause flammable mixtures or lead to
excessive carbon monoxide. To avoid hazardous gases
and flammable vapors follow proper installation and
set up of this product and all warnings as provided in
this manual.
Figure 1.
Figure 2.
