Pump Relay Replacement
1. Shut-off electrical power to the boiler.
2. Remove control cover screws and open control
compartment.
3. Disconnect wiring to the relay.
4. Remove screws (2) holding relay.
5. Reverse above procedure to re-install.
High Limit Control
1. Shut-off electrical power to the boiler.
2. Remove control cover screws and open control
compartment.
3. The control is factory set at 180°F. To adjust set-
ting, use a small screw driver and turn dial
clockwise to lower the temperature or counter-
clockwise to raise the setting.
4. To replace the limit control, disconnect the wiring
connections.
5. Remove screws (2) holding the limit control.
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 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.
33
Summary of Contents for 0042B
Page 14: ...VENT DAMPER 14 ...
Page 20: ...Wiring Diagrams 20 ...
Page 21: ...21 ...
Page 24: ...Fig 23 Power Vent System with Zone Valve Taco 24 ...
Page 25: ...25 Fig 23 Power Vent System with Zone Valve Honeywell ...
