Raytherm 0042B, Installation & Operating Instructions Manual

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Flame Roll-out Switch Replacement
1. Shut-off electrical power to the boiler.
2. Remove wiring connections to switch.
3. Remove screws (2) holding the switch.
4. Reverse above procedure to re-install.
vent Thermal Switch Replacement
1. Shut-off electrical power to the boiler.
2. Remove wiring connections to switch.
3. Remove the screws (2).
4. Reverse above procedure to re-install.
Ignition Module Replacement
1. Shut-off electrical power to the boiler.
2. Remove control cover screws and open control
compartment.
3. Disconnect wiring connections to module.
4. Remove screws (2) holding module.
5. Reverse above procedure to re-install.
Transformer Replacement
1. Shut-off electrical power to the boiler.
2. Remove control cover screws and open control
compartment.
3. Disconnect wiring connections from transformer
leads.
4. Remove screws (2) holding transformer.
5. Reverse above procedure to re-install.
Adjustment & Replacement of
Components
Gas valve Replacement
1. Shut-off electrical power and gas supply to the
boiler.
2. Remove gas piping to gas valve inlet.
3. Disconnect wiring connections, pilot tubing (when
present).
4. Remove screws (2) holding the burner tray.
5. Slide burner tray out.
6. Remove gas valve bracket screws and bracket.
7. Unscrew gas valve from gas pipe.
8. Reverse above procedure to re-install.
Gas valve Adjustment - Robertshaw
(Invensys) 7000 Series 2-Stage Gas
valve with Solenoid valve
1. Turn the heater off.
2. Remove the 3/8” nut or the #10 Torx screw.
3. Lift solenoid valve up, keeping the wires connect-
ed to the solenoid valve.
4. If only low fire adjustment is needed, go to Step 9.
5. Using a 3/8” wrench, carefully remove the alu-
minum cap that was under the solenoid
valve-count # of turns when removing the cap.
Be careful not to drop the cylinder (weight) or the
small spring that is under the cap –see Fig. 33.
6. Remove the spring and store in a safe place.
7. Using an Allen wrench, turn the screw clockwise to
increase or counterclockwise to decrease high fire
manifold pressure –see Fig. 33.
8. Install the spring, weight and aluminum cap –tight-
en the cap using same # of turns as was used in
removing the cap.
9. For low fire adjustment, tighten the aluminum cap
to increase and loosen to decrease low fire mani-
fold pressure.
10. Install 2-stage solenoid valve and turn heater on,
check manifold pressures.
11. Repeat steps 3 to 10 until correct manifold pres-
sures are obtained.
12. Secure 2-stage solenoid valve by tightening the
3/8” nut or #10 Torx screw.
DANGER—SHOCK HAZARD:
Make sure
electrical power to the boiler is disconnected to avoid
potential serious injury or damage to components.
NOTE:
Attach a manometer and check the manifold
pressures –both high fire and low fire– before
making any adjustments.
Fig. 33: 2-Stage Gas Valve Adjustment (Invensys)
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