Rinnai I Series User Manual

98 Rinnai I-Series Condensing Boiler Combi Manual
The boiler has the capability to operate simultaneously between central heang and domesc hot
water. The boiler can control dividing the ow between the domesc hot water plate heat
exchanger and the central heang circuit.
The boiler is set to a default domesc hot water priority operaon. If it is desired to have
simultaneous operaon of central heang and domesc hot water, follow the steps below.
IMPORTANT: The central heang supply water temperature can be as high as 180°F (82°C) or higher
during simultaneous operaon. If the central heang temperature is lower than 140°F (60°C), the
default seng is to not permit simultaneous operaon. The boiler would then default to a domesc
hot water priority seng. This is to prevent unintenonally supplying high supply water temperature
to a low water temperature applicaon.
If it is desired to have simultaneous operaon with a higher domesc hot water setpoint than the
central heang setpoint, access the parameters (as shown in secon “12.4 Parameter Sengs”) and
adjust parameter 14 to “b.” In this scenario, there is the potenal to have higher temperature water
being supplied to the central heang system. Ensure that the central heang system is designed for
this high supply water temperature.
If it is desired to have more capacity delivered to central heang during simultaneous operaon,
adjust parameter 15 to “b” (as shown in secon “12.4 Parameter Sengs”). This will enable the 3-way
valve to deliver a higher ow rate to the central heang circuit. This may restrict domesc hot water
capacity in this scenario.
1. Remove the boiler’s front panel by removing the four screws that secure the panel.
2. Locate the PC Board (lower le side of unit). Locate the DIP switches on the PC Board (see below).
3. Adjust DIP switch 4 to the ON posion.
PC Board
DIP Switches
Push the PCB
Buon Switch
4 (Red buon)
to move to
Seng Mode.
ON
IMPORTANT
When selecng simultaneous CH and DHW operaon, Rinnai recommends the use of hydraulic
separaon. In simultaneous operaon, the ow rate from the internal pump to the CH system
may be reduced. This can cause insucient heat transfer to the CH system. When selecng
simultaneous CH and DHW operaon, do not place pumps in series in primary piping.

Rinnai I Series Specifications

General

Brand	Rinnai
Model	I Series
Category	Boiler
Language	English