Installation Manual

Hydronic Air Handler Installaon and Operaon Manual 27
Install the Rinnai Tankless Water Heater or
Boiler by following the Installation and Operation
Manual supplied with the unit.
• For Tankless Water Heaters -
SENSEI™ SE+ Series (RU Condensing) Models:
Refer to the next section: “5.6.1 Option A: Installation
Instructions for SENSEI™ SE+ Series (RU
Condensing) Tankless Water Heaters”
• For Tankless Water Heaters -
HE+ Series (RL Non-Condensing) and
HE Series (V Non-Condensing) Models: Refer to
section: “5.6.2 Option B: Installation Instructions for
HE+ Series (RL Non-Condensing) and HE Series (V
Non-Condensing) Tankless Water Heaters”
• For I-Series Boiler Models: Refer to section “5.6.3
Option C: Installation Instructions for I-Series Combi
Boilers”
IMPORTANT
IMPORTANT
The Domestic Priority Switch (part # REU-
OPU3) is an optional accessory (purchased
separately) recommended for use with the
hydronic air handler.
The Domestic Priority Switch allows the tankless
water heater or boiler to give priority to domestic
hot water by shutting off the air handler when
necessary. When used with a hydronic air
handler, the switch gives priority to domestic hot
water. When domestic hot water demand
exceeds a certain point, the air handler will turn
off to ensure the demand is met.
The Domestic Priority Switch is a Normally
Closed (NC) switch that connects to the PC
Board in the Rinnai tankless water heater or
boiler.
To install the Domestic Priority Switch, open the
contents of the Domestic Priority Switch shipping
package and follow the remaining instructions in
this section.
You Will Need:
• Parts inside switch shipping package
• Philips head screwdriver (for removal of
water heater or boiler front cover)
• Double-sided tape (for boiler models)
If you are not installing the Domestic Priority
Switch:
• Skip this section and proceed to section
“5.7 Connect Water Lines.”
• Ensure not to short out the harness
connectors that would normally be used
with the Domestic Priority Switch.
Ensure the power supply to the water heater and
hydronic air handler is disconnected before starting
installation. Removing the front cover will expose live
mains voltage connections.
WARNING
1. Power off the water heater by unplugging the power
cord or turning off the circuit breaker. The controller
on the water heater does not control the electrical
power.
2. Remove the front panel of the water heater by
removing the four screws that secure the panel in
place.
3. Locate the PC Board in the bottom, right corner of
the water heater.
PC Board
5.6.1.1 Install Switch Circuit Board