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12. 2-Stage Controller (Models 90, 135 & 180)
a) Shut-off electrical power to the boiler.
b) Remove control cover screws and open con-
trol compartment.
c) 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.
d) To replace the stage controller, disconnect
the wiring connections.
e) Remove screws (2) holding the staged
controller.
f) Remove upper access panel.
g) Remove the wedge or retaining clip holding
the sensing bulb in the control well in the in/
out header.
h) Pull out the sensing bulb carefully from the
control well.
i) Remove the stage control with capillary from
unit.
j) Reverse above procedure to re-install.
6. REPLACEMENT PARTS LIST
NOTE: To supply the correct part it is important that you
supply the model number, serial number and type of gas
when applicable.
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 war-
ranty, the part will be returned in kind or equal substitu-
tion, freight collect. Credit will not be issued.
RAYPAK, INC.
2151 Eastman Avenue
Oxnard, CA 93030
34
9. Fast-Response Temperature Sensor Module
Replacement
a) Shut-off electrical power to the boiler.
b) Remove control cover screws and open
control compartment.
c) Disconnect wiring to the board.
d) Carefully pull out the control board from the
nylon pin supports.
e) Reverse above procedure to re-install.
10. Fast-Response Temperature Sensor Probe
Replacement
a) Shut-off electrical power to the boiler.
b) Shut-off water supply to the boiler and open
drain valve to remove water to the sensor
probe level.
c) Remove control cover screws and open
control compartment.
d) Disconnect wire leads from control board.
e) Remove upper access panel.
f) Remove sensor probe from in/out header.
g) Reverse above procedure to re-install.
11. Circulator Replacement
a) Shut-off electrical power to the boiler.
b) Shut-off water supply and open drain valve
to remove water in the piping at the pump
level.
CAUTION: To avoid damage to electrical components
keep water from getting into the control compartments
and gas valve.
c) Disconnect wiring and conduit connections to
the pump.
d) Disconnect the bypass tube connections to
the inlet flange.
e) Remove the nuts and bolts at the inlet and
outlet flanges. Remove old gaskets.
f) Remove the pump.
g) Reverse the above procedure to re-install.
Use new gaskets and make sure they are
seated properly when tightening the nuts
and bolts.