Installation Manual

64 Rinnai I-Series Condensing Boiler Solo Manual
The boiler has the ability to operate
simultaneously between central heang
and domesc indirect tank heang. The
boiler can control dividing the ow
between domesc hot water producon
to the indirect tank and the central
heang circuit.
The boiler is set to domesc indirect tank
recovery as the priority. If it is desired to
have simultaneous operaon of central
heang and domesc hot water, access
the parameters (as shown in the
“Parameter Sengs” secon of this
manual) and adjust parameter 33 to “b.”
When DIP Switch 3 is in the OFF (default)
posion, the opon to select the duraon
of the indirect tank priority will become
available in Parameter 34. Aer this
period of me passes, the indirect tank
will cease to be heated and central
heang will have priority. If there is sll
an indirect tank demand aer 60 minutes
passes of CH priority, indirect tank priority
will begin again.
When DIP Switch 3 is in the OFF (default)
posion, Parameter 32 is selected to be
“Use Pump,” and when Parameter 33 is
selected to be "Simultaneous Heang
with Indirect Tank and CH" Parameter 35
becomes available. This enables CH
seng limitaon during simultaneous
heang. This can prevent unintenonally
supplying high temperature supply water
to low water heang temperature
applicaons such as oor heang. During
simultaneous operaon, the heang
supply temperature is based on the
indirect tank supply temperature. When
"NO" is selected, make sure that the CH
system and heang applicaon is
designed to allow for the high supply
temperature.
IMPORTANT:
The central heang supply temperature may
be up to 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 not to permit
the simultaneous operaon. The boiler
would then default to a DHW system with
Indirect Tank priority seng. In this
scenario, it prevents unintenonally
supplying high temperature supply water to
low water heang applicaon.
If the indirect tank seng is above 140°F
(60°C) and it is desired to have simultaneous
operaon with the indirect tank setpoint
higher than the CH setpoint, access the
parameters (as shown in the “Parameter
Sengs” secon of this manual) and adjust
parameter 35 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.
• When set for simultaneous
operaon, the me to recover the
indirect tank may be increased. If
high domesc hot water usage is
desired without greater potenal of
temperature loss, it is not
recommended to use the
simultaneous operaon feature.
• When the boiler is unable to perform
simultaneous operaon between CH
and recovering an indirect tank, the
indirect tank heang will take priority
and CH operaon will occur aer the
tank temperature is sased or
indirect tank priority me has
elapsed.
NOTE
NOTE
Refer to secon “12.3.8 PC Board DIP
Switches” for more informaon on boiler
DIP switches.