Domestic Water Treatment Accessory; Dhw Expansion Tank; Installing A Valve Kit - Rinnai Q85SN Installation & Servicing Instructions Manual

6.5.2
6.5.3
6.5.4
Service valve
Boiler DHW piping

Domestic water treatment Accessory

Rinnai offers a domestic water treatment device that can help reduce scale build up.
This device can be installed on the incoming cold water line for any combi boiler. For
additional information on contact Rinnai.

DHW Expansion Tank

A domestic water expansion tank could be required by local code. Check local code
to determine if it is required.
If a combi boiler is installed in a closed water supply system, such as one having a
backfl ow preventer in the cold water supply line, means shall be provided to control
thermal expansion. Contact the water supplier or local plumbing inspector on how to
control thermal expansion.

Installing a valve kit

A means to isolate the domestic indirect tank water heater for cleaning must be
provided at installation. Refer to fi gure 13 for proper piping layout. A Rinnai valve kit
can be used on domestic water connections for all combi boilers to allow for cleaning of
indirect tank water heater and installation the domestic hot water pressure relief valve.
• Rinnai recommends the use of the WRIK-LF-F(3/4" NPT thread connection) or WRIK-C kit
(WRIK-C (3/4" sweat connection) when connecting the domestic water lines to the boiler.
• Use of this kit will assist in fl ushing the indirect tank water heater in areas where
water quality issues exist, as well as improve overall product serviceability.
P
Low Loss Header
T
V1 V2
Service valve
Plumbing valve Kit
DHW supply DHW supply
Sediment Filter
Cold water
fi gure 13
29