Rinnai
7
HW Demand Duo Systems OIM
SAFETY DEVICES
For safe operation this water heater is fitted with a combination Pressure & Temperature Relief Valve, a temperature
controller and an over-temperature cut out on each heater.
WARNING
DO NOT
tamper with or remove safety devices.
DO NOT
operate this water heater unless all safety devices are fitted and in working order.
The operation of the thermal cut out indicates a possibly dangerous situation.
DO NOT
reset the
thermal cut out until the water heater has been serviced by a qualified person.
Pressure & Temperature Relief (PTR) Valve
This valve is located near the top of the storage tank and is essential for safe operation.
WARNING
DO NOT
seal or block the outlet of the PTR valve or its drain pipe.
DO NOT
replace the PTR valve with one that has a higher pressure rating than is specified for
the water heater.
The PTR valve should be checked for performance or replaced at intervals not exceeding 5 years, or more frequently
in areas with a high incidence of water deposits by a qualified person. The easing gear must be operated at least
once every six months or more frequently in areas with a high incidence of water deposits.
WARNING
Failure to do this may result in the water heater cylinder failing or under certain circumstances,
exploding. Water discharged will be very hot. Exercise care to avoid scald injury. If the valve does
not seal again when the easing gear is closed, contact Rinnai to arrange inspection by a qualified
person.
It is important you raise and lower the easing gear gently. If the valve does not discharge water when the easing
gear lever is lifted, there may be a serious problem and the power supply to the system must be switched off
immediately. Contact Rinnai to arrange inspection by a qualified person.
It is normal for the PTR valve to release a small quantity of water through the
drain pipe during heating. If the valve dribbles or leaks continuously, try easing
the valve gear for a few seconds. This may dislodge any foreign matter and stop
leakage. If leakage does not stop there may be a problem as detailed below:
•
If there are heavy flows of water until the water heater is cold which then
stops until the water reheats there may be a serious problem and the power
supply to the system must be switched off immediately. Contact Rinnai to
arrange inspection by a qualified person.
•
If there is a steady flow for long periods, often at night, it may be as a result
of the water pressure exceeding the design pressure of the water heater.
Contact your installing plumber as a Pressure Limiting Valve (PLV) may be
required.
Expansion Control Valve (ECV)
An ECV is recommended in all geographical areas where the water supply has
a tendency to cause scaling, including South Australia and Western Australia. Local regulatory authorities may
require that an ECV be fitted. The ECV is to be supplied and fitted by the installer. Refer to the section Water
Quality for more information on scaling water.
If an ECV is fitted, operate the easing gear at least once every six months to remove any deposits and to verify
that it is not blocked.
The ECV should be checked for performance or replaced at intervals not exceeding 5 years, or more frequently in
areas with a high incidence of water deposits by a qualified person.
It is normal and desirable that the ECV allows a small quantity of water to be discharged through the drain pipe
during the heating cycle. If the valve dribbles or leaks continuously, operate the easing gear for a few seconds. This
may dislodge any foreign matter and stop leakage. If leakage does not stop Contact Rinnai to arrange inspection
by a qualified person.
Gently lift lever until
water flows from drain
line, lower lever gently
to close
IMPORTANT INFORMATION
