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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.
To test this function:
1. Turn on the water heater/boiler and air handler.
2. Open the hot water taps until the air handler turns off.
3. Close the hot water taps.
4. The air handler should turn back on if the thermostat is calling for heat.
Rinnai Tankless Water Heater or Boiler
Air Handler
Control
Switch
Hydronic Air Handler Installation and Operation Manual
Air Handler
Control
Panel
33
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