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7. Remove the wedge or retaining clip holding the
sensing bulb in the control well in the in/out head-
er.
8. Pull out the sensing bulb carefully from the control
well.
9. Remove the limit control with capillary from unit.
10. Reverse above procedure to re-install.
Fast-Response Temperature Sensor
Module Replacement
1. Shut-off electrical power to the boiler.
2. Remove control cover screws and open control
compartment.
3. Disconnect wiring to the board.
4. Carefully pull out the control board from the nylon
pin supports.
Reverse above procedure to re-install.
Fast-Response Temperature Sensor
Probe Replacement
1. Shut-off electrical power to the boiler.
2. Shut-off water supply to the boiler and open drain
valve to remove water to the sensor probe level.
3. Remove control cover screws and open control
compartment.
4. Disconnect wire leads from control board.
5. Remove upper access panel.
6. Remove sensor probe from in/out header.
7. Reverse above procedure to re-install.
Circulator Replacement
1. Shut-off electrical power to the boiler.
2. Shut-off water supply and open drain valve to
remove water in the piping at the pump level.
3. Disconnect wiring and conduit connections to the
pump.
4. Disconnect the bypass tube connections to the
inlet flange.
5. Remove the nuts and bolts at the inlet and outlet
flanges. Remove old gaskets.
6. Remove the pump.
7. Reverse the above procedure to re-install. Use
new gaskets and make sure they are seated prop-
erly when tightening the nuts and bolts.
CAUTION: To avoid damage to electrical
components, keep water from getting into the control
compartments and gas valve.
2-Stage Controller
(Models 90, 135 & 180)
1. Shut-off electrical power to the boiler.
2. Remove control cover screws and open control
compartment.
3. The control is factory set at 160°F. To adjust to
another setting, use a small screw driver and turn
dial clockwise to lower the temperature or counter-
clockwise to raise the setting.
4. To replace the stage controller, disconnect the
wiring connections.
5. Remove screws (2) holding the staged controller.
6. Remove upper access panel.
7. Remove the wedge or retaining clip holding the
sensing bulb in the control well in the in/ out head-
er.
8. Pull out the sensing bulb carefully from the control
well.
9. Remove the stage control with capillary from unit.
10. Reverse above procedure to re-install.
Replacement Parts List
Any part returned for replacement under standard
company warranties must be properly tagged with
Raypak return parts tag, completely filled in with the
heater serial number, model number etc., and shipped
to Raypak freight prepaid.
If determined defective by Raypak and within warran-
ty, the part will be returned in kind or equal
substitution, freight collect. Credit will not be issued.
RAYPAK, INC.
2151 Eastman Avenue
Oxnard, CA 93030
NOTE: To supply the correct part it is important that
you supply the model number, serial number and
type of gas when applicable.