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ZG - Remove Heat Exchanger
1- Turn main manual shut-off valve off and turn off
electrical supply to unit.
2- Open access panels as shown in figure 8.
IMPORTANT - Remove and retain the speed nut that
holds the heat exchanger bracket to the panel. The speed
nut will be used when replacing the bracket and panel.
3- Remove the gas manifold. See figure 9.
4- Remove the burner box assembly. Retain six screws
holding the assembly in place. See figure 9.
5- Disconnect wiring to the ignitor, flame sensor,
combustion air prove switch, flame roll-out switch and
primary limit. See figures 9 and 10.
6- Remove the primary limit. See figure 10.
7- Remove the vent connector from the combustion air
inducer. See figure 10.
8- Remove the combustion air inducer. See figure 10.
9- Remove screws securing heat exchanger to unit.
Rotate two parts on the front side of the frame and
remove heat exchanger. See figure 11.
Note - Take care not to tear insulation when removing or
installing heat exchanger.
ORIFICES
(3, 5, OR 7)
Remove and retain two
screws on each side;
remove manifold.
BURNER BOX ASSEMBLY - ZG
FLAME
SENSOR
BURNERS
GAS
MANIFOLD
FIGURE 9
REMOVE PANELS - ZG
GAS
IGNITOR
VALVE
Page 5
REMOVE
PANEL
REMOVE
PANELS
FIGURE 8
Remove screws securing
burner box; three on the
top, three on the bottom.
SPEED
NUT
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