Reversible Water Connections - Trane TR250 Service & Installation Manual

REVERSIBLE WATER CONNECTIONS:

This heater is designed so that it can be installed with the water connections located on either the right or
left side. Heaters are factory-shipped with right-side water connections. To move the connections to the left
side follow the instructions below. A trained service technician should perform these steps before the heater is
installed.
PROCEDURE:
1. Before beginning, be aware that it is not necessary to re-
move the water header from the heat exchanger. When
this procedure is complete, the water inlet will be located
at the BACK of the heater. The water outlet will be lo-
cated at the FRONT.
2. Remove screws and remove both of the upper plastic
heater side panels (see
wires that pass through a hole in the heater side panel go
through a split-bushing, which will allow separation of
the wires from the panel without disconnecting them.
3. Disconnect the 2 wires connecting the heater wire har-
ness to the heat exchanger header. One is located on the
water pressure switch and one is located on the tempera-
ture limit switch, both on the top of the header. Pull these
wires into the heater cabinet from the hole in the right-
hand metal side panel in the heater, and re-route them out
through the left-hand metal side panel in the heater.
4. Remove countersunk screws on the heater top and remove louvered exhaust panel on heater top (see Figure
8).
5. Remove the heater top fl ue cover by removing 3 screws on each side of the heater (see Figure 8).
6. Remove screws and remove rain shield assembly (see Figure 8). Note that there are screws which hold the
rain shield assembly to the heat exchanger tube sheets, which also must be removed.
7. Remove the front access panel (see Figure 8).
8. Disconnect water temperature sensor plug from the ignition control board located inside the heater (see
Figure 8).
9. Pull the water temperature sensor wires out of the heater cabinet through the hole in the right-hand metal
side panel.
10. Lift and rotate the heat exchanger. Do not fl ip. Use care when setting the heat exchanger in place not to
damage the white sealing gaskets or combustion chamber.
11. Route the water temperature sensor wires into the heater cabinet through the hole in the left-hand metal side
panel, and re-connect to the ignition control board.
12. Re-connect the heater wire harness to the water pressure switch and temperature limit.
13. Reverse the above steps to reassemble the heater.
Figure 7 and Figure 8). Note the
Figure 7: Screw locations on side of unit
Screw Locations
19