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9.
Unscrew the brass compression fitting securing
the pressure switch to the inlet/outlet header.
Remove tube from header and gently bend it out
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 9). 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 10).
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 8). Remove flue collector.
6.
Remove the three rubber jacket/plug grommets
and drain plugs (see Figure 7). One is located
under the water connections on the right side.
The other two are on the left side of the heater.
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.
Figure 8. Flue collector hold-down brackets.
11. When removing the heat exchanger from the
heater (sizes 125,175 and 250 only), the end
baffles of the heat exchanger must be removed.
There are two baffles covering part of the front
and rear tubes of the heat exchanger. Each
baffle is held in place by two screws which
mount to the top of the combustion chamber wall.
Remove the screws and the baffles before
attempting to lift the heat exchanger out of the
heater (see Figure 11).
Figure 10. Vestibule covers.
Figure 9. Temperature sensing bulb.
Figure 11. Heat exchanger and end baffles.
