Rinnai CU160i Installation And Operation Manual page 64

FILTERS
•
Water Filter — Clean the inlet water filter by closing
the cold and hot water inlet isolation (shut-off) valves.
Put a bucket under the filter at the bottom of the
water heater to 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.
•
Air Filter — See section "5.2 Cleaning and Inspecting
the Air Filter" for more information.
•
Bypass Filter (Crossover Mode Only) — Clean the
bypass filter (Note: Bypass filter is only used in
Crossover Mode).
PRESSURE RELIEF VALVE
Operate the pressure relief 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 has a safe place to flow.
Contact with your body or other property may cause
damage or harm.
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.
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 images
below:
SATISFACTORY
FLAME ROD
BLUE FLAME
UNSATISFACTORY
FLAME ROD
YELLOW FLAME
64
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 "Freeze Protection"
section (Section 3.2 Choose an Installation Location >
Freeze Protection). The water heater may be drained
manually. However, it is highly recommended that drain
down solenoid valves be purchased and installed, which
will automatically drain the water heater if power is lost.
(The condensate trap drain plug and Pressure Relief
Valve are not affected by the auto drain down solenoid
valves and will have to be manually opened.)
WINTERIZATION
The following 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.
Note: See section "5.4 Draining the Water Heater" for
detailed instructions on:
•
•
FRONT VIEW
•
•
FRONT VIEW
Rinnai Tankless Water Heater Installation and Operation Manual
•
Draining the water heater
•
Running a low volume of water through the
water heater to prevent freezing
•
Steps to take when the water heater or
external pipes have frozen
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.
Condensate
Drain the condensate using the condensate drain
port on the bottom of the water heater.
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.