20
10.
Plumbing Applications
Recirculation System
Combination Potable Water and Space Heating System
Cold Water Supply
Isolation
Kit(*3)
Gas Supply
Aquastat(*2)
Hot Water
Optional 30-38L (8-10 Gallon)
Storage Tank
(To alleviate cold water sandwich)
Globe
Valve
Pump(*1)
Expansion Tank
(Install according
to local code)
Fixtures
Hot Water Return
R
B
W
Pump
120VAC
105
Neutral
Ground
Live
S
Isolation
Kit(*1)
Gas Supply
Backflow Preventer
(optional)
Check
Valve(*3)
Cold Water
Supply
Mixing Valve(*5)
Hot Water
Pump(*2)
Flow Switch(*4)
Fixtures
Air Handler
Notes:
Notes:
Use Honeywell Aquastat
(Model L6006A or L6006C)
Aquastat Wiring
1. Size the pump to provide a maximum of 5.7 L/min.
(1.5 GPM) through the system at 3m (10 ft) 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 5
°
C (10
°
F) below the set
output temperature.
3. Noritz recommends the use of an Isolation Kit
with the installation.
These kits include an integrated shut-off and serv-
ice valve with unions and a pressure relief valve.
1. Noritz recommends the use of an Isolation Kit with
the installation.
These kits include an integrated shut-off and serv-
ice valve with unions and a pressure relief valve.
2. Size the pump to provide a maximum of 7.5 L/min.
(2 GPM.) 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 7.5 L/min. (2 GPM.)
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 scald
-ing.
6. Expansion tank required if a backflow preventer is
installed.
Optional
Expansion Tank(*6)
NORITZ
Tankless Gas
Water Heater
NORITZ
Tankless Gas
Water Heater
