PRESTIGE Excellence
HX Field Replacement
Kit
4
1. Remove both top access panels located above
the heat exchanger and water heater on the top
jacket panel.
2. Remove ignition cable and green ground wire
from the igniter. (Fig. 4).
3. Disconnect the ignition cable from the MCBA
control module and remove air intake pipe from
venturi. (Shown as item 2 in Fig 1). Place the
intake pipe and ignition cable aside, DO NOT
discard as they will be re-used.
4. Disconnect the electrical connection(s) for the
blower at the blower housing.
5. Remove the mounting screw and disconnect the
black rectifier plug from the gas valve.
6. Disconnect the grey flat ribbon cable from the
display board at the MCBA control module.
7. Disconnect the orange low voltage and high volt-
age wiring terminal strips by unplugging the bot-
tom strips from the upper portion.
8. Remove the retaining screw for control mount-
ing panel and swing open the control mounting
panel. The high voltage and low voltage termi-
nals should pass through the lower cutouts of
the panel to allow movement of the panel.
9. Disconnect the red wire leads from supply tem-
perature sensor (Shown as item 3 in Fig. 1)
located at the top of the heat exchanger.
10. Disconnect the blue wire leads from return tem-
perature sensor (Shown as item 4 in Fig. 1)
located at the bottom of the heat exchanger.
11. Disconnect the orange wire leads from the Low
Water Cut-Off (LWCO) pressure switch
(Shown as item 5 in Fig. 1). Use care when dis-
connecting the wire leads as not to damage the
LWCO terminals or the wire leads.
Removal of Electrical Connections (TriMax)
Before disconnecting any wire connections mark and
label all connections and locations of the connections.
1. Remove both top access panels located above
the heat exchanger and water heater on the top
jacket panel.
2. Slide left and right tabs of control panel inward
and lower control panel.
3. Pull the retaining tabs on top of the rear cover to
remove the rear control box cover.
4. Remove green ground wire from the igniter and the
ignition cable from the TriMax control module.
5. Remove air intake pipe (Shown as item 2 in Fig.
1) from venturi. Place the intake pipe aside, DO
NOT discard as it will be re-used.
6. Disconnect the electrical connection(s) for the
blower at the blower housing.
7. Disconnect the Molex plug from the gas valve.
8. Disconnect the Molex plug from supply tem-
perature sensor (Shown as item 3 in Fig. 1)
located at the top of the heat exchanger.
NOTICE
Ignition
Cable
Igniter
Venturi
Fig. 4: Top of Heat Exchanger
