32
Rinnai Tankless Water Heater Installation and Operation Manual
4.6 Connect Water Supply
4.6.1 Guidelines
•
The piping (including soldering materials) and components connected to this appliance must be
approved for use in potable water systems.
•
Purge the water line to remove all debris and air. Debris will damage the water heater.
•
The appliance must not be connected to a system that was previously used with a non-
potable water heating appliance.
•
Ensure that the water filter on the water heater is clean and installed.
•
Verify water pressure meets requirements.
•
DO NOT introduce toxic chemicals such as those used for boiler water treatment to the
potable water used for space heating.
4.6.2 Instructions
To connect the water supply, follow the instructions below.
1. Plumb the cold water supply line to the water heater on the 3/4 in. MNPT connection at the bottom of
the water heater marked “C.”
2. Plumb the hot water supply line to the 3/4 in. MNPT connection marked “H.”
3. If a pipe cover will be installed, make sure water lines to the water heater fit within the confinements
of the pipe cover.
Gas Suppl
y
3
/4"
Cold Water Suppl
y
Line
3
/4" Hot
Water Supp
ly
Line
Rinnai
Eq
uip
m
ent List
Rinnai
Water Heaters
RIK-KIT (
Optional)
(
3
/4" F
ittings
Incl
ude
:
2 Union
s,
2
B
all
V
al
v
es
,
2 Drain
Valv
es and
1
P
ressu
re Relief Valve.)
Q
TY
1
1
3
/4"
Gas Conne
c
tion
For
B
uilding Fi
x
tures
Pressure Relief Valve
3
/4" Ball Valve
3
/4"
Union
Check V
a
lve
S
Pressure Regula
tor
Cir
c
u
lating Pump
Solenoid
Valve
Boiler Drain Va
l
v
e
KEY
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
o
fficials before installation.
Condensate drain line
Condensate
drain
Gas Suppl
y
3
/4"
Cold Water Suppl
y
Line
3
/4" Hot
Water Supp
ly
Line
Rinnai
Eq
uip
m
ent List
Rinnai
Water Heaters
RIK-KIT (
Optional)
(
3
/4" F
ittings
Incl
ude
:
2 Union
s,
2
B
all
V
al
v
es
,
2 Drain
Valv
es and
1
P
ressu
re Relief Valve.)
Q
TY
1
1
3
/4"
Gas Conne
c
tion
For
B
uilding Fi
x
tures
Pressure Relief Valve
3
/4" Ball Valve
3
/4"
Union
Check V
a
lve
S
Pressure Regula
tor
Cir
c
u
lating Pump
Solenoid
Valve
Boiler Drain Va
l
v
e
KEY
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
o
fficials before installation.
Condensate drain line
Condensate
drain
The condensate drain pipe (along its entire
length) must be at least the same diameter
as the drain line (1/2 in. NPT).
PIPING DIAGRAM FOR BASIC INSTALLATION
Figure 28
Gas Supply
Cold Water Supply Line
Hot Water Supply Line
Water connections to the water heater should follow all state and local plumbing codes. If this is a
standard installation, refer to the “Piping Diagram for Basic Installation” below.
IMPORTANT
