Life Cycle Warning Steps; Neutralizer Life Cycle Warning And Replacement Procedures (Condensing Models Only) - Noritz NR50-OD Service Manual

Neutralizer Life Cycle Warning and Replacement Procedures
(NCC199/NRC111 and N-0841MC/N-0842MC series only)
Neutralizer Life Cycle Counter Operation: Neutralizer Usage Estimate
When the water heater operates at full capacity, the life cycle counter will add 1 hour of neutralizer usage for approxi-
mately every hour of water heater usage time.

Life Cycle Warning Steps

1. Error code "92" will display on the remote controller when life cycle counter has reached 1114 hours (maintenance
monitor will display "111").
2. Error code "92 will display on the remote controller and the maximum hot water capacity will be limited to 2.6 GPM
when the life cycle counter has reached 1214 hours (maintenance monitor will display "121").
3. When the life cycle counter has reached 1314 hours (maintenance monitor will display "131"), error code "93" will
display on the remote controller and the water heater will operate in safe mode only.
Note : When replacing the neutralizer, it is necessary to reset the life cycle counter; refer to the proceeding sections for
instructions.
Neutralizer Replacement
Replace the neutralizer following the procedures below:
1. Disconnect electrical power to the unit.
2. Drain water from the neutralizer using the drain valve located underneath the water heater (Fig. 1).
3. Disconnect the relay connector, remove the fixing screw, and remove drain hose 1, drain hose 2, and the neutralizer
drain hose (Fig. 1). Remove the neutralizer by lifting up on it to disengage the tabs.
Note) When removing the drain hoses, make sure that water in the hose does not come into contact with your eyes
or hands. If it comes into contact with your eyes or hands, rinse it off immediately with fresh water. Do not
allow water from the drain hoses or neutralizer to leak into the water heater.
4. Connect the neutralizer drain hose (with pin clip) to the new neutralizer and install the neutralizer.
Reconnect drain hose 1 and drain hose 2 as well as the relay connector.
Note : Drain hose 1 and drain hose 2 must be oriented so that there is a downwards slope and there are no bends
or kinks in the hoses.
Do not connect the wires labeled as "Connector (Factory Use Only)" as shown in Fig. 1.
Water Level Electrode
Neutralizer Packing
Drain Hose 1
Tab
Rear
Pin Clip
Fig. 1
80
Connector (Factory Use Only)
Relay Connector
Fixing screw
Front
Drain Hose 2
Neutralizer Drain Hose
Drain Valve (underneath water heater)