Rinnai REU-VAM1620W, Operation And Installation Manual

22 

V53e Outdoor Manual 

Pressure Relief Valve

3/4" Ball Valve

3/4" Union

Check Valve

S

Pressure Regulator

Circulating Pump

Solenoid Valve

Boiler Drain Valve

KEY

Gas Supply

Minimum 3/4"

Cold Water
Supply Line

Minimum 3/4" Hot Water

Supply Line

S

1/2" Minimum
Normally Open
Solenoid Valve

3/4" Minimum
Normally Closed
Solenoid Valve

Route to Floor Drain

Vacuum
Breaker

NOTE:

ALL pipe and fittings shown below dashed line
should be located inside home or building
structure.

NOTE:

Heat trace ALL water pipe and fittings located
outside home (attic, crawl space) or building
structure. (ALL water pipe and fittings shown
above the dashed line in the drawing.)

Rinnai

Water Heater

3/4" Gas Connection

S

The vacuum breaker line should be located
inside the building structure.

This is not an engineered drawing.  It is intended only as a guide and not
as a replacement for professionally engineered project drawings. This
drawing is not intended to describe a complete system.  It is up to the
contractor/engineer to determine the necessary components and
configuration of the particular system being installed. This drawing does
not imply compliance with local building code requirements.  It is the
responsibility of the contractor/engineer to ensure installation is in
accordance with all local building codes.  Confer with local building
officials before installation.

Freeze 

Protection 

Piping 

Warranty does not cover damage due to freezing. 

With electrical power and gas supplied to a Rinnai 
water heater, it will not freeze in environments as cold 
as -30º F when protected from direct wind exposure. 

In the event of a power failure at temperatures below 
freezing the water heater should be drained of all 
water to prevent freezing damage. 

The unit may be drained manually.  However, Rinnai 
highly recommends that drain down solenoid valves 
be installed that will automatically drain the unit if 
power is lost.  Rinnai also recommends the installation 
of a sub-PC board that attaches to the PC board in the 
unit and allows the solenoid valves to operate if the 
unit is disabled due to an error code.  

When the electrical power to the water heater fails, the 
3/4” solenoid valve closes (stopping the flow of water 
into the heater) and the 1/2” solenoid valve opens 
(allowing the water heater and associated piping to 
drain.  Ensure that you run the drain for the solenoids 
to the outside environment to prevent discharging 
water inside the building causing water damage). 

NOTICE