Installer reference guide / Mono tank integrated type 75
To protect the field piping against freezing, install the following parts.
nc : nomal close
d
d
c
c
a
b
a
Outdoor Unit
nc 2way
nc 2way
Primary
pump
Strainer
Backup
heater
Expansion
vessel
a. Shut off valve (in/out)
b. Aeration valve (Optional - field supply)
c. Anti freeze valve (Optional - field supply)
d. Normally closed valves (recommend - field supply)
CAUTION
If the system is utilized for both cooling operation (summer), please install freeze protection valves with an
ambient air sensor in order to avoid valve opening due to low water temperatures.
Alternatively set FSV #1012 (minimum cooling set point) 7°C or higher in order to prevent triggering the
freeze protection valves during cooling operation.
Part Description
Aeration valve (to clear the water from the system).
Protection for the field piping. The anti freeze valve must be installed (field supply)
• Vertically to allow water to flow out properly and free from obstructions.
• At the lowest point in all field piping.
• In the coldest part and away from heat sources.
Water isolation inside the house in case of power outage.
Normally closed valves (located indoors near the inlet/outlet pipes) can prevent all water in the indoor
plumbing from draining when the anti freeze valve is opened. (filed supply)
• Power outage: The normally closed valves close to shut off the water in the house. When the anti
freeze valve is open, only water outside the house is drained.
• Other situations (eg pump failure): When the anti freeze valves open when the power is still applied
to the normally closed valves, the system will drain completely.
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