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18.6 Recirculation System
Service Valve Kit with
Pressure Relief Valve (*4)
To Auto Feeder
*1 Size the pump to provide a maximum of 2 GPM (7.5 L/min)
through the system at 10 ft (3m) of head plus piping losses.
Adjust the flow using a globe valve and verify the flow rate
with the maintenance monitors.
*2 An Aquastat must be used to control the pump.
*3 Set the Aquastat to 10˚F below the DHW Temperature
Setting. An aquastat is the minimum pump control
requirement in order to maintain the full recirculation
warranty.
*4 It is recommended that the use of Service Valve Kit with
Pressure Relief Valve with the installation. The kit includes
an integrated shut-off and service valve with unions and a
pressure relief valve.
* The heating might not operate in some conditions during recirculation.
Be sure to make sure the following requirement when install the recirculation system.
• Insulate the DHW Supply and Return pipe completely to prevent the recirculation operation continuously.
78
Plumbing Applications
Cold Water Supply
Aquastat (*2,3)
Optional 8-10 Gallon
Storage Tank
(To alleviate cold water sandwich)
DHW Supply
* When the pump for the recirculation
system is operating, there may be cases
when the Heating Mode can not operate.
It depends on the relationship between
the Domestic Hot Water Temperature and
the Heating Temperature.
Hot Water Return
Fixtures
Expansion Tank
(Install according
to local code)
Air Vent
Globe
Valve
Pump(*1)
Air Out
105
Pump
R
120VAC
B
W
Neutral
Ground
Live
Aquastat Wiring
Use Honeywell Aquastat
(Model L6006A or L6006C)
S
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