Rinnai I Series User Manual

94 Rinnai I-Series Condensing Boiler Combi Manual
CROSSOVER MODE
Dedicated mode — Home includes a dedicated
circulaon return line in the plumbing system.
Crossover mode (factory default) — Home does
not include a dedicated circulaon return line.
Requires installaon of a thermal bypass valve at
the furthest xture in the plumbing system.
DEDICATED MODE
This boiler has the capability to control DHW recirculaon. While the default seng for
recirculaon is “o,” when DIP switch 3 is turned “on,” the DHW recirculaon funcon becomes
available.
When ulizing the domesc hot water recirculaon funcon, the pump must be wired to the Pump
2 terminal on the PC Board. Therefore, if two central heang zone pumps are used, an external
central heang zone controller is required.
During the DHW recirculaon operaon, the boiler will be in DHW operaon mode. To prevent the
central heang (CH) system from being inacve too long and the house potenally cooling down,
the boiler will operate in simultaneous operaon between DHW and CH as long as the DHW
recirculaon is taking place.
If the output target temperature for the CH system is higher than the temperature needed to heat
the DHW, the CH supply temperature will not be aected. The CH supply temperature will connue
to be the target temperature set for CH.
If the output target temperature for the CH system is less than the need to heat DHW, the supply to
the CH system will increase to the water temperature needed for DHW.
Rinnai strongly recommends installing insulaon to the hot water and
dedicated return lines to decrease the amount of heat loss.
IMPORTANT
Two recirculaon modes are available: Crossover and Dedicated.
The temperature restricon can be canceled by adjusng Parameter 14. If
adjusted to "No" temperature restricon, ensure that the CH system and
heat emiers are designed for the hot water temperature supplied to the domesc plate heat
exchanger (typically 149°—185°F). Failure to do so could cause damage to the CH system, heat
emiers, or building in which the system is installed.
CAUTION

Rinnai I Series Specifications

General

Brand	Rinnai
Model	I Series
Category	Boiler
Language	English