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Connec on Diagram
Cold water inlet
with filter
Pump drain plug
Hot water outlet with
bypass plug (or
bypass filter)
Condensate trap drain plug
Connect Water Heater to Water Supply
Water connecti ns to the tankless water heater
should follow all state and local plumbing codes.
If this is a standard installation, refer to the "Piping
Diagram for Basic Installa on" in this manual.
1. Plumb water supply to the tankless water heater
on the 3/4" MNPT connec on at the bo om of
the unit marked "Water Inlet", which is the cold
water supply.
2. Plumb the building hot water supply to the 3/4"
MSPT connec on marked "Water Outlet", which
is the hot water supply.
If a pipe cover will be installed, make sure water lines
to the water heater t properly.
Installa on of a potable water thermal expansion tank
is required.
Condensate drain line
Checklist for Plumbing
□
Purge the water line of all debris and air by closing
the hot isola on valve and opening the cold
isola on valve and its drain. Debris will damage
the water heater. Use a bucket or hose if
necessary.
□
Ensure that hot and cold water lines are not
crossed to the unit and are leak free.
□
Ensure that a pressure relief valve is installed with
a rating that exceeds the BTU input of the water
heater model. Refer to the rating plate on the
side of the water heater for BTU input.
□
Clean the water lter(s) by closing the cold and
hot water inlet isola on (shut-off valves. Put a
bucket under the lter(s) at the bo om of the
water heater to catch any water that is contained
inside the unit. Unscrew the water lter(s). Rinse
the filter(s) to remove any debris. Install the
lter(s) and open the isolation valves.
□
Check for proper water pressure to the water
heater. Minimum water pressure is 50 psi. Rinnai
recommends 60-80 psi for maximum
performance.
□
Ensure thermal expansion tank is properly
installed per local codes.
KBP Series Manual
Water drain plug
Check valve drain plug
Gas connecti n
41
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