Selection Guide; Maintenance - Rinnai 37AHB SERIES Installation, Operation And Maintenance Manual

Maintenance

4. Install new motor, and reassemble circulator using
the new gasket and bolts supplied.
5. Follow the "installation" procedure to start up the
circulator.
Replacing Pump Cartridge Assembly:
1. Disconnect the electrical supply.
2. Reduce system pressure to 0 psi and allow system
to return to room temperature. Isolate the circulator
by closing the service valves or draining the
system.
3. Remove the body bolts and swing motor assembly
away from the volute.
4. Pull cartridge out of the motor housing.

Selection Guide

Hydronic Furnace and Tankless Water heater Sizing Guidelines
Figure 24:
Rinnai Corporation Hydronic Furnace (37AHB) Manual
5. Install replacement cartridge, making sure that the
cover plate is between the cartridge flange and
motor.
6. Make sure the replacement cartridge corresponds
to the full circulator product number. A complete
parts list is available from your local distributor.
7. Reassemble the circulator using the new gasket
and bolts supplied.
8. Follow the "Installation" procedure to start up the
circulator.
Replacing Pump Capacitor:
1. Replacement capacitor must have same rating as
originally furnished.
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