Fig. P — Three-Way Motorized Control Valve Package
On the 3-way motorized valve, flow is normally closed to
coil and open to system return. Motor closes bypass flow to
system return while opening flow through coil. Water
bypasses coil and flows directly to system return when unit
is OFF.
The aquastat (A) clips on supply line upstream from 3-way
valve (as shown above). It senses system water tempera-
ture to prevent cooling operation with hot water in system
piping or heating operation with chilled water in system pip-
ing. Aquastat(s) required for 2-pipe cooling and heating with
automatic changeover control and/or auxiliary electric heat.
A bypass balancing valve may be specified in the bypass
line to permit equal flow balancing.
Supply and return connections at coil will be swage fit for
field braze (standard) or unions (option).
Check job specifications for system pressure, pressure
drop limitations and flow rate prior to selecting valve pack-
age components or valve package size (1/2 in., 3/4 in.,
etc.).
2-PIPE SYSTEM (One Valve Package) or 4-PIPE SYSTEM
(Two Valve Packages) Application:
• 2-Pipe — Hydronic Heating Only
• 2-Pipe — Hydronic Cooling Only
• 2-Pipe — Hydronic Cooling with Total Electric Heat
• 2-Pipe — Hydronic Cooling and Heating
LEGEND
NOTES:
1. Packages factory furnished and installed.
2. Valves are 5/8 in. ODS unless otherwise specified.
3. If an automatic flow control valve is added, it will be
located on supply line between shutoff valve and coil (or
motorized control valve, if supplied).
4. When aquastat is used for automatic changeover,
bypass is required.
Balancing Valve
Ball Valve
Motorized 3-Way Valve
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