Plumbing Applications - Noritz NRC111-DV-NG Installation Manual

12.

Plumbing Applications

NORITZ
Condensing
Tankless Gas
Water Heater
Isolation
Kit(*4)
Relay for Pump
(if larger than 85 Watts)
Hot Water
Combination Potable Water and Space Heating System
NORITZ
Condensing
Tankless Gas
Water Heater
Isolation
Kit(*1)
Recirculation System
Cold Water Supply
Fixtures
Expansion Tank
(Install according
to local code)
Gas Supply
Globe
Aquastat(*3)
Valve
Pump Control Signal(*2)
Optional 8-10 Gallon
Storage Tank
(To alleviate cold water sandwich)
Pump(*2)
Check
Valve(*3)
Gas Supply
Hot Water
Notes:
1. Size the pump to provide a maximum of 2 GPM
Hot Water Return
2. Pump Control Signal is the preferred method
3. Use an Aquastat if the water heater is not control-
4. Noritz recommends the use of an Isolation Kit
Pump(*1)
Notes:
1. Noritz recommends the use of an Isolation Kit with
2. Size the pump to provide a maximum of 3 GPM
Air Handler
3. Check valve required if it is not included with the
4. Set the flow switch to deactivate the Air Handler
5. If the system requires water for space heating at
6. Expansion tank required if a backflow preventer is
Flow Switch(*4)
Optional
Expansion Tank(*6)
Mixing Valve(*5)
through the system at 10 ft of head plus piping
losses.
Adjust the flow using a globe valve and verify the
flow rate with the maintenance monitors.
to control the recirculation pump.
For pumps larger than 85W, a relay connection
must be used. If the Pump Control Signal is not
used, an Aquastat may be used to control the
pump.
ling the pump.
Set the Aquastat to 10°F below the set output
temperature.
with the installation.
These kits include an integrated shut-off and serv-
ice valve with unions and a pressure relief valve.
Pump
120VAC
Neutral
Ground
Live
Aquastat Wiring
Use Honeywell Aquastat
(Model L6006A or L6006C)
the installation.
These kits include an integrated shut-off and serv-
ice valve with unions and a pressure relief valve.
with a head pressure equal to the loss through the
water heater and Air Handler.
pump.
when the domestic hot water flow reaches 3 GPM.
Adjust as necessary to prevent cycling.
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.
installed.
Backflow Preventer
(optional)
Cold Water
Supply
Fixtures
105
R
B
S
W
21