Freeze Protection And Winterization - Rinnai ANS Z21.10.3 Installation And Operation Manual

catch any water that is contained inside the unit.
Unscrew the water filter. Rinse the filter to remove
any debris. Install the filter and open the isolation
valves.
WARNING
Testing the pressure relief valve should only be
performed by a licensed professional. Water
discharged from the pressure relief valve could cause
severe burns instantly or death from scalds.
Pressure Relief Valve:
Operate the valve manually once a year. In doing so,
it will be necessary to take precautions with regard to
the discharge of potentially scalding hot water under
pressure. Ensure discharge water has a safe place to
flow. Contact with your body or other property may
cause damage or harm.
Visual Inspection of Flame
Verify proper operation after servicing. The burner
must flame evenly over the entire surface when
operating correctly. The flame must burn with a clear,
blue, stable flame. See the parts breakdown of the
burner for the location of the view ports. The flame
pattern should be as shown in the figures below.
Freeze Protection
Make sure in case of freezing weather that the water
heater and its water lines are adequately protected to
prevent freezing. Damage due to freezing is not
covered by the warranty. Refer to the section on
Freeze Protection. The unit may be drained manually.
However, it is highly recommended that:
40

drain down solenoid valves be purchased and
installed that will automatically drain the unit if
power is lost. These are available in a kit,
104000059. (The condensate trap is not affected
by the auto drain down solenoid valves and will
have to be manually drained.)

a surge protector with terminals be purchased
and installed which allows the solenoid valves to
operate if the unit is disabled due to a diagnostic
code. This is available as 104000057.
Winterizing
These recommendations are intended to suggest
practices that are effective for winterizing the water
heater. They should be used as a guide only. No
liability is assumed for any issues resulting from the
use of this information.
GAS
Shut off the gas to the water heater. It is generally
preferable to shut off the gas service to the entire
location if gas is not going to be used.
WATER
Shut off the cold water supply to the water heater. It
is generally preferable to shut off the water to the
entire location if water is not going to be used.
Drain the water heater by opening the drain valves on
the cold water line and hot water line.
Open several hot water taps and remove the filter
assembly at the water inlet in order to allow room for
expansion in case there is water in the lines that
freeze. Compressed air may be used to purge any
water left in the system.
ELECTRIC
Disconnect the power supply by either unplugging the
electrical cord or by turning off the circuit breaker to
the water heater to prevent potential damage from
irregular power surges or interruptions.
VENT TERMINATION
Place a cover over the vent termination (intake and
exhaust) if it can be safely accessed. The cover should
be easy to apply and remove. This will prevent
debris, leaves, and small animals from entering the
venting and water heater which could cause air flow
issues upon return to service.
VC Series Manual