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10.
Plumbing Applications
NORITZ
Condensing
Tankless Gas
Water Heater
Isolation
Kit(* )
Hot Water
Combination Potable Water and Space Heating System
If the Air Handler does not control the water flow automatically, the Scale detection feature will not work.
NORITZ
Condensing
Tankless Gas
Water Heater
Isolation
Kit(*1)
▲The illustration is an example. Please check with the actual water heater about the position of piping, and form.
Recirculation System
Cold Water Supply
Fixtures
Expansion Tank
(Install according
to local code)
Gas Supply
Globe
Aquastat(*2)
Valve
Optional 8-10 Gallon
Storage Tank
(To alleviate cold water sandwich)
Pump(*2)
Check
Valve(*3)
Gas Supply
Hot Water
Hot Water Return
Pump(*1)
Notes:
1. 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.
Air Handler
2. Size the pump to provide a maximum of 2 GPM
(7.5 L/min.) with a head pressure equal to the loss
through the water heater and Air Handler.
3. Check valve required if it is not included with the pump.
4. Set the flow switch to deactivate the Air Handler when
the domestic hot water flow reaches 2 GPM (7.5 L/min.).
Adjust as necessary to prevent cycling.
5. If the system requires water for space heating at a higher
temperature than for other uses, means such as a
mixing valve shall be provided to temper the water for
the other uses to help prevent scalding.
6. Expansion tank required if a backflow preventer is installed.
7. The water heater cannot be used for space heating
applications only.
8. Only POTABLE water may be plumbed through
the water heater.
Flow Switch(*4)
Optional
Expansion Tank(*6)
Mixing Valve(*5)
Notes:
1. Size the pump to provide a maximum of 1.5GPM
(5.7L/min.) through the system at 10ft (0.3m) of
head plus piping losses.
Adjust the flow using a globe valve and verify the
flow rate with the maintenance monitors.
2. Set the Aquastat to 10˚F below the set output temperature.
An aquastat is the minimum pump control requirement
in order to maintain the full recirculation waranty.
3. 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.
105
Pump
120VAC
Neutral
Ground
Live
Aquastat Wiring
Use Honeywell Aquastat
(Model L6006A or L6006C)
Backflow Preventer
(optional)
Cold Water
Supply
Fixtures
R
B
S
W
19
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