Rinnai Sensei CU199i Installation And Operation Manual page 59

4.9.2 Instructions
To connect the condensate drain pipe:
1. Apply thread sealant to 1/2 in. MNPT
condensate drain port.
2. Thread 1/2 in. NPT fitting onto condensate
drain port.
3. Follow the steps in the next section:
"Condensate Pump Safety Switch Wiring."
Condensate Drain
Figure 61
4.9.3 Condensate Pump
Safety Switch Wiring
IMPORTANT
The steps in this section must conform with
local codes and the guidelines established by
the National Electrical Code (NEC).
The condensate pump (if installed) should be
wired to deactivate the water heater in the event
the condensate pump fails.
1. Disconnect power from the water heater.
2. Open the water heater cover and locate two
white wires labeled "To Condensate Pump
Safety Switch."
Rinnai Tankless Water Heater Installation and Operation Manual
1/2 in. MNPT
3. Cut crimp connectors off white wires and strip
the insulation off of the two ends.
4. Select an appropriate length of wire (18 AWG
or greater) and strip the insulation off the ends.
Follow the wiring guidelines established by the
National Electrical Code (NEC).
To Condensate Pump
Safety Switch
Cut off crimp
connectors
Figure 62
5. With wire nuts or other approved wire
connectors, connect the "To Condensate
Pump Safety Switch" wires to the normally
open contacts on the condensate pump (see
image below).
6. Reconnect power to the water heater and
press the "On/Off" button on the controller.
Test Operation
1. Test the operation of the shut off switch by
unplugging the condensate pump and filling
the condensate reservoir with water until the
float switch closes the circuit.
2. Turn on the water heater.
3. The water heater displays diagnostic code
"25."
4. Plug in the condensate pump in and confirm
condensate is flowing out of the reservoir.
5. Turn off the water heater by pressing the "On/
Off" button on the controller. Wait five seconds
then turn the power back on. This will clear the
diagnostic code.
Strip insulation
off both ends
of wire
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