System Maintenance - Rinnai RIN250EHP Installation And Owner's Manual

The heat pump water heater is designed
to eliminate system maintenance other
than that detailed in this manual.
Personally inspecting or servicing any
part of the system is not recommended.
Should you decide to personally inspect
the system, it is essential that you
observe all normal safety practices.
Most importantly, the electricity
supply must be turned OFF.
Every 5 years, you should contact the
local service agent to replace all safety
valves and anodes to ensure continued
system life and operational safety.
Six Monthly Service – By Owner
Operate the Pressure & Temperature
Relief Valve for approximately 10
seconds by operating the easing lever
on the valve to ensure water is relieved
to waste through the relief drain pipe.
Check to ensure the valve closes
correctly.
Five Year Service – By Authorised
Personnel Only
The five yearly services should be
carried out by a licensed tradesperson
where it is recommended that this
service be carried out by your local
Rinnai agent.
The service should include the following:
• Replace the Pressure &
Temperature Relief Valve.
• Replace the anodes (in locations
20

System Maintenance

Installation and Owner's Manual – Heat Pump
where the potable water has a
TDS greater than 600 ppm, this
service is recommended every 3
years). All models are equipped
with 2 sacrificial anodes, accessible
through the top cover.
• Flush the water heater by doing the
following:
(i) Turn off the power.
(ii) Turn off the cold water supply to the
water heater at the isolating valve.
(iii) Gently operate the easing lever on
the Pressure & Temperature Relief
Valve to release the pressure in the
water heater.
(iv) Disconnect the cold water inlet
union to the heater and attach a
drain hose.
(v) Gently operate the Pressure &
Temperature Relief Valve to let air
into the heater and allow water to
escape through the hose.
(vi) To flush the heater, carry out steps
(i) to (iv) above. Disconnect the hot
water inlet union and attach a water
supply hose to the heater. Turn on
the water supply.
(vii) Flush the heater until clear water
appears, then reconnect all fittings,
fill the heater and restore the
electricity supply.
Draining the Water Heater
To drain the water heater, follow steps i
to v above until no more water escapes
from the appliance.
H4123 025961 Rev. A July 2012