Installation Guide

55
Gas Supply
Backflow
Preventer
(optional)
Cold Water
Supply
Hot Water
Fixtures
Air Handler
Pump
Size the pump to provide
a maximum of 3 GPM
(11.3 L/min) with a head
pressure equal to the
loss through the water
heater and Air Handler.
Check Valve
Check Valve required if it
is not included with the
pump.
Optional Expansion Tank
Expansion tank required if a
backflow preventer is installed.
Flow Switch
Set the flow switch to deactivate
the Air Handler when the
domestic hot water flow re
aches
3 GPM (11.3 L/min).
Adjust as necessary to prevent
cycle.
Isolation Kit
Noritz recommends the use of an Isolation
Kit with the installation. These kits include
an integrated shut-off and service valve
with unions and a pressure relief valve.
Mixing Valve
If the system requires water for space
heating at temperatures higher than
required for other uses, a means such as
a mixing valve shall be installed to
temper the water for those uses in order
to reduce scald hazard potential.
Combination Potable Water and Space Heating System
• The Water Heater cannot be used for space heating applications only.
• Only POTABLE water may be plumbed through the Water Heater.
Plumbing Applications