Installation Sheet

Rinnai Tankless Water Heater Installaon and Operaon Manual 49
IMPORTANT: The steps in this secon must conform with
local codes and the guidelines established by the Naonal
Electrical Code (NEC).
The condensate pump (if installed) should be wired to
deacvate 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 2 white wires
labeled “To Condensate Pump Safety Switch.”
3. Cut crimp connectors o white wires and strip the
insulaon o of the two ends.
4. Select an appropriate length of wire (18 AWG or
greater) and strip the insulaon o the ends. Follow
the wiring guidelines established by the Naonal
Electrical Code (NEC).
To connect the condensate drain pipe:
1. Apply thread sealant to 1/2 in. MNPT condensate drain port.
2. Thread 1/2 in. NPT ng onto condensate drain port.
3. Follow the steps in the next secon: “Condensate Pump Safety Switch
Wiring.”
Condensate Drain Pipe Connecon
Cut o
crimp connectors
To Condensate Pump
Safety Switch
Strip insulaon
o both ends
of wire
Condensate Pump Safety Switch Installaon
NC
NO
COM
Tankless Water Heater
Test Operaon
1. Test the operaon of the shut o switch by
unplugging the condensate pump and lling the
condensate reservoir with water unl the oat
switch closes the circuit.
2. Turn on the water heater.
3. The water heater displays diagnosc code “25.”
4. Plug in the condensate pump in and conrm
condensate is owing out of the reservoir.
5. Turn o the water heater by pressing the “On/O”
buon on the controller. Wait 5 seconds then turn
the power back on. This will clear the diagnosc
code.
Wire Nut Connecng
Two Wires
To Condensate Pump
Safety Switch Wires
Installer-Supplied Wires
Safety switch wires connect
to the NO and COM contacts
on the safety switch.
• NO - Normally Open
• NC - Normally Closed
• COM - Common (Neutral)
Safety Switch Wires
Condensate Pump (installer-supplied)
Includes internal safety switch and power cord.
Power cord must be plugged into power source.
Condensate Drain
1/2 in. MNPT
Condensate Pump Safety Switch Wiring
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/O” buon on the controller.