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Rinnai 8 B Series Heat Pump OIM - Issue 1
SAFETY DEVICES
The water heating system is supplied with various safety devices including temperature sensors, overheat sensors
and switches and a Pressure & Temperature Relief (PTR) valve. These devices must not be tampered with or
removed. The water heating system must not be operated unless each of these devices is tted and is in working
order.
WARNING
DO NOT tamper with or remove safety devices�
DO NOT operate the water heater unless all safety devices are tted and in working order.
DO NOT block or seal the PTR Valve and drain pipe�
Pressure & Temperature Relief (PTR) Valve
This valve is located near the top of the water heater and is
essential for safe operation. It is normal for the valve to release
a small quantity of water through the drain line during heating.
However, continuous leakage of water from the valve and its
drain line may indicate a problem with the water heater.
WARNING
NEVER block the outlet of the PTR valve or it’s drain line for any reason� The easing gear MUST
be operated at least every 6 months to remove lime deposits and verify that it is not blocked�
Failure to do this may result in the water heater failing�
If the valve does not discharge water when the easing gear lever is opened, or does not seal again
when the easing gear is closed, attendance by an authorised person MUST be arranged without
delay� The PTR valve is not serviceable�
EXCESSIVE DISCHARGE FROM SAFETY DEVICES
Pressure & Temperature Relief (PTR) Valve
It is normal and desirable that this valve allows a small quantity of water to be discharged during the heating cycle.
If it discharges more than a bucket of water during a 24 hour period or discharges continuously there may be
another problem.
If the valve dribbles continuously, try easing the valve gear for a few seconds as described above. This may
dislodge any foreign matter and alleviate the problem.
If the valve discharges at high ows, especially at night, it may be as a result of the water pressure exceeding the
design pressure of the water heater. Ask your installer to t a Pressure Limiting Valve (PLV).
WARNING
NEVER replace the PTR valve with one which has a higher pressure rating than is specied for
your water heater�
Expansion Control Valve (ECV) - if required
It is normal that this valve allows a small quantity of water to be discharged during the heating cycle. If it discharges
more than a bucket of water during a 24 hour period or discharges continuously there may be another problem.
If the valve leaks continuously, try easing the valve gear for a few seconds. This may dislodge any foreign matter
which may be causing the problem. If this does not x the issue, contact Rinnai.
Operate the easing gear regularly to remove any lime deposits and to verify that it is not blocked.
Lift lever un til w ater
flo w s from drain line
(Lo w er lever g en tly!)
WARNINGS AND IMPORTANT INFORMATION
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