Install Instructions

Installation & Servicing Instructions Rinnai Q-Series
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6.5.3 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.
6.5.4 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.
Boiler DHW piping fi gure 14
T
P
Low Loss Header
V1
Service valve
V2
Service valve
Sediment Filter
Cold water
Plumbing valve Kit
6.5.5 Pressure relief Valve for Combi boilers
- An approved pressure relief valve is required by Rinnai for all water heating systems.
- The relief valve must comply with the standard for Relief Valves and Automatic Gas
Shutoff Devices for Hot Water Supply Systems ANSI Z21.22 and/or the standard
Temperature, Pressure, Temperature and Pressure Relief Valves and Vacuum
Relief Valves, CAN1-4.4.
- The relief valve must be rated up to 150 psi and to at least the maximum BTU/hr
of the appliance.