Installation Guide

52 Rinnai Tankless Water Heater Installation and Operation Manual
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” (if needed).
1/2 in. MNPT
Condensate Drain
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.”
Strip insulation off
both ends of wire
Cut off crimp
connectors
To Condensate Pump Safety Switch
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. Confirm 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.
IMPORTANT
The steps in this section must conform with
local codes and the guidelines established by
the National Electrical Code (NEC).
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).
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.
Figure 49
Figure 50