Installation & Servicing Instructions Rinnai Q Premier
30
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
back
fl
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 Thermostatic Mixing Valve
A thermostatic mixing valve is required to be installed on all Q Premier boilers on
the domestic hot water side to prevent scalding. This valve will regulate the water
temperature leaving the hot water tank. See
fi
gure 14 for the suggest piping.
Boiler DHW piping
fi gure 14
T
P
V1
Service valve
V2
Service valve
Plumbing valve Kit
6.5.5
Installing a valve kit
A means to isolate the domestic plate heat exchanger and domestic hot water tank for
cleaning must be provided at installation. Refer to
fi
gure 14 for proper piping layout. A
Rinnai valve kit can be used on domestic water connections for all Q Premier boilers
to allow for cleaning of the domestic plate heat exchanger and domestic hot water tank.
• Rinnai recommends the use of the WRIK-LF-F(3/4” NPT thread connection) when
connecting the domestic water lines to the boiler.
• Use of this kit will assist in
fl
ushing the storage tank in areas where water quality
issues exist, as well as improve overall product serviceability.
6.5.6
Domestic Hot Water Recirculation
The boiler is provided with a factory installed connection for a domestic hot water
recirculation line. A standard recirculation pump correctly sized for the system and
the tank can be used with the Q Premier boiler. If a recirculation line will not be
connected to the Q Premier the recirculation connection on the pre-bend pipe cap
must be capped off. See
fi
gure 7 for the location of the connection.
Sediment
fi
lter
Cold water
Mixed water
to
fi
xtures
Thermostatic
mixing valve
