Rinnai 21
Commercial Heat Pump OIM
CONNECT THE PTR VALVE
Connect the PTR valve to the uppermost fitting of the storage tank. See the diagram on the tank user manual.
The PTR pressure rating
MUST
be suited for the tank and adequate for the thermal loading applied to the storage
tank. Use Teflon thread tape on the valve, never use hemp or other sealing materials. Ensure the tape does not
protrude past the end of the thread, which could result in it hanging over the end of the thread and blocking the
water passage through the valve.
Connect the supplied PTR valve into the top socket marked ’Relief Valve’ and discharge according to plumbing
regulations. PTR Valves for the unit are rated at 1000kpa.
The drain line from this valve
MUST
run in a continuously downward direction with the discharge end left
permanently open to atmosphere.
PLUMBING CONNECTIONS
The heat pump water heater system comprises three main components: the heat pump water heater, storage
tanks and primary circulator. An auxiliary booster and/or circulator may also be employed as part of the system.
The water heater must not be operated until all components are assembled.
An approved isolating valve, non return valve, line strainer, and union
MUST
be fitted between the supply main
and the tank. All fittings
MUST
be approved by the relevant installation Authority.
An ECV
MUST
be fitted in Western Australia and South Australia to the cold water supply to the storage tank to
comply with local regulations.
An ECV is recommended in all other geographical areas where the water supply has a tendency to cause scaling.
This will reduce hot water discharge from the pressure and temperature relief (PTR) valve which minimises wear
on this valve.
This water heater is designed for direct connection to water supply pressures of no greater than those specified on
page 13. Where the mains pressure can exceed or fluctuate beyond this, a pressure limiting device (complying
with AS1357)
MUST
be fitted.
Refer to the following table “Minimum Pipe Sizing” on page 22 for sizing. Header pipe sizing is based on a total
length of 40m of primary discharge and return piping and 20 x 90° bends with 1.2m/sec velocity.
Evaluate total pressure drop from discharge to return piping and ensure. It is less than heat pump maximum
outer water head stated in section “System Specifications” on page 13. If this specification is exceeded, please
consult Rinnai before installation.
Up to ten storage tanks can be manifolded together in water loop. The storage tanks must be of the same model.
CHP040 Installation Dimension
2006
4-Ø 16
878
Inlet/Outlet
R2” MBSP
INSTALLATION
