Rinnai RUR98i - Pressure Relief Valve (PRV); Visual Inspection of Flame; Freeze Protection

KBP Series Manual 69

Operate the PRV manually once a year. In doing so, it
will be necessary to take precauons with regard to
the discharge of potenally scalding hot water under
pressure. Ensure discharge has an appropriate place
to ow. Contact with your body or other property
may cause damage or harm.

Verify proper operaon aer servicing. The burner
must ame evenly over the enre surface when
operang correctly. The ame must burn with a clear,
blue, stable ame. See the parts breakdown of the
burner for the locaon of the view ports.
The ame paern should be as shown in the gures
below:

Make sure that 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
secon on Freeze Protecon. The unit may be drained
manually. However, it is highly recommended that:
 drain down solenoid valves be purchased and
installed that will automacally drain the unit if
power is lost. These are available in a kit,
104000059. (The condensate trap drain plug,
water drain plug, and pump drain plug are not
aected by the auto drain down solenoid valves
and will have to be manually opened.)
 a surge protector with terminals be purchased
and installed which allows the solenoid valves to
operate if the unit is disabled due to a diagnosc
code. This is available as 104000057.

These recommendaons are intended to suggest
pracces that are eecve for winterizing the water
heater. They should be used as a guide only. No
liability is assumed for any issues resulng from the
use of this informaon.
GAS
Shut o the gas to the water heater. It is generally
preferable to shut o the gas service to the enre
locaon if gas is not going to be used.
WATER
Shut o the cold water supply to the water heater. It
is generally preferable to shut o the water to the
enre locaon 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 lter
assembly located in the cold water inlet and the plug/
lter assembly located in the hot water outlet, in
order to allow room for expansion in case there is
water in the lines that freeze.
ELECTRIC
Disconnect the power supply by either unplugging the
electrical cord or by turning o the circuit breaker to
the water heater to prevent potenal damage from
irregular power surges or interrupons.
VENT TERMINATION
Place a cover over the vent terminaon (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
venng and water heater which could cause air ow
issues upon return to service.


FRONT VIEW
YELLOW
FLAME ROD
FRONT VIEW
BLUE
FLAME ROD
Tesng 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.
WARNING