Raypak 337A Operations Instructions download pdf (Page 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. Digital Models: Remove the thermostat tempera-

ture 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. Digital Models: Insert the tempera-ture sensor in

the compression fitting and 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.

Fig. #1

Fig. #2

Fig. #3

Fig. #5

Fig. #4

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Raypak 337A Operations Instructions Page 25