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7. Tag and disconnect the white wire on the
pressure switch (PS) and the white wire from the
fusible link.
8. Remove plastic tie wraps and pull the white
wires out of the front compartment through the
vestibule cover and coil them on the heat
exchanger.
9. Unscrew the brass compression fitting securing
the pressure switch to the inlet/outlet header.
Remove tube from header and gently bend it out
the connections to the left side to improve access for
installation and service. Perform this modification
before installing the heater using the following proce-
dures:
1. Remove heater door.
2. Remove all 8 hex-head screws fastening the top
and lift the top assembly straight up (see Figure
8).
3. Remove rain shield assembly and set it aside.
4. Remove screws that fasten the gap closures to
the jacket and put them aside. Remove gap
closures.
5. Remove the screws securing the two flue
collector hold down clamps and remove the
clamps (see Figure 9). Remove flue collector.
6. Remove the three rubber jacket/plug grommets
and drain plugs (see Figure 8). One is located
under the water connections on the right side.
The other two are on the left side of the heater.
Figure 9. Flue collector hold-down brackets
Figure 11. Vestibule covers
Figure 12. Heat exchanger and end baffles
Figure 10. Temperature sensing bulb
of the way.
10. Loosen the screw securing the temperature sensing
bulb retainer bracket. Slide the retainer bracket off
the bulb flange and remove the bulb from the
header (see Figure 10). Pull pressure switch tube
through the hole in the vestibule cover and into the
vestibule (controls compartment), then pull the
thermostat bulb assembly through same hole (see
Figure 11).
11. When removing the heat exchanger from the
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