I Series Combi Installation Manual

Rinnai I-Series Condensing Boiler Combi Manual 97
When the recirculaon logic starts, the pump will operate as described below:
 When the DHW return water temperature reaches approximately 6°F (3°C) below the
DHW set point temperature, power to the pump will be disconnued from the PC Board.
 Aer the o interval me of the boiler has passed, the pump will turn on again.
 If the boiler does not detect ow from the pump during the DHW recirculaon on mes,
an E631 diagnosc code will display on the controller.
Timer Connects to T/T 2
IMPORTANT
The target ow rate for DHW recirculaon is from 1.3 GPM (5 L/min) to 4 GPM (15 L/min). If the
ow rate is less than 0.8 GPM (3 L/min), the DHW recirculaon pump will operate and an E631
diagnosc code will display on the controller. If the DHW recirculaon pump ow rate drops to
less than 0.4 GPM (1.5 L/min), the DHW recirculaon pump will stop and an E631 diagnosc
code will display on the controller. The proper pump size needs to be selected for the pressure
drop through the recirculaon loop (maximum current: 2 Amps).
DHW Recirculaon Pump
Connect to “DHW_Pump
Terminal” (label on PC Board)