Continuous Flow Water Heater Operation Guide 04-12
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19
Draining your water heater
Frost protection is fitted as standard on all models manufactured from 2010 onwards.
Frost protection operates automatically (as required) whenever the appliance is
connected to the electric power supply.
If you live in an area prone to frost
and will be away for an extended
period with the power supply
disconnected, Rinnai recommend
draining your appliance to prevent
frost damage (not covered by
warranty).
We strongly recommend having
your water heater drained
by a plumber or gasfitter but
understand that remote locations
and cost may prohibit this.
About this instruction
These instructions are intended
as a guide only. Rinnai will not
accept liability for issues arising
from the use of this information.
In particular Rinnai will not be
responsible for damage caused
by water freezing where this
procedure was followed and
sufficient water failed to drain from
the unit.
Instructions
You will need:
-
A bucket if water cannot be
drained into a garden or drain
-
Approx. 15 minutes (to
complete)
To avoid burns wait until
the water heater cools
before draining the water
as hot water may drain
from the unit if there has
been recent hot water use.
1. Turn off any water controllers
in the building and then turn
off the water, gas, and power
at the unit.
2. To flush the water heater
open all hot water taps in the
building. Refer to picture on
next page.
3. If required, place the bucket
under the unit and unscrew
the water filter and hot water
drain plug. If you have an EF
continuous flow water heater
you will also need to unscrew
the condensate trap and water
drain plugs.
4. Drain the water heater—can
hold up to one litre of water
and surrounding pipes.
Refilling your water heater
1. Check that the gas and power
is turned off. Turn off any open
hot water taps.
2. Insert the condensate trap
plug, screw in the water heater
drain plugs and the water filter
in the cold water inlet.
3. Turn on the cold water at the
continuous flow water heater.
4. Turn on the hot tap to purge
air from the pipe work and
unit.
5. Turn off the hot tap.
6. Turn on the gas and power
at the continuous flow water
heater and turn on any
temperature controllers in the
building.
When the water heater or
external pipes have frozen
DO NOT operate the water heater
if it or the external pipes have
frozen. Close the gas and water
valves and turn off the power. Wait
until the water thaws, check this by
opening the water supply valve.
Check the water heater and pipes
for leaks.
WARNING
Filter
Drain
Gas
Valve
Gas
Cold
Hot
Turn Water Off
Turn Gas Off
Drain Water
