25
HEAT EXCHANGER REVERSAL PROCEDURE - STANDARD MODELS
1. Remove right and left side access panels
(Figure 1).
2
. Disconnect wires at high limit, AGS (automatic gas
shut-off), and pressure switch on the in/out
header (Figure 2).
3. AFT Models: Remove the thermostat temperature
sensor by loosening the compression fitting nut
(Figure 3). Re-route the sensor to the left side of
the heater.
4. Millivolt Models: Remove the temperature sen-
sor bulb and retainer clip from the sensor well
(Figure 4). Re-route the sensor bulb to the left side
of the heater.
5. Remove (12) bolts holding the inlet/outlet and
return headers to the tube sheets. Clean off tube
sheet area where the gasket seats. Also clean off
the header and the gasket. Apply a non-petrole-
um-based lubricant to the gasket such as
AquaLube. Re-attach the headers to the opposite
sides, making sure they are installed in an upright
position (Figure 5). Do not over tighten. Torque
should not exceed 7 ft/lb.
6. Reconnect high limit, AGS, and pressure switch
wires.
7. AFT Models: Insert the temperature sensor into
the compression fitting, so that the sensor is flush
with the top of the fitting. Tighten 1/2 turn past
hand-tight.
8. Millivolt Models: Insert sensor bulb and retainer
clip into sensor well.
9. Allow for water flow through the heater and check
for leaks.
10. Re-attach access panels to the opposite sides.
For ASME Models call your factory representative.
F
ig. #1
Fig. #2
Fig. #3
Fig. #5
Fig. #4
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