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VALVE PACKAGES (cont)
Two-Way Motorized Control Valve
The 2-way motorized valve motor drives valve open
and a spring returns valve to normally closed position
(no water flow with unit OFF).
Supply connection at coil will be swage fit for field braze
(standard) or union (option). Return connection at coil
will be factory brazed if isolation valve only. Addition of
any other component will require swage fit for field braze
or optional union connection.
Check job specifications for system pressure, pres-
sure drop limitations and flow rate prior to selecting valve
package components or valve package size (
1
⁄
2
Љ,
3
⁄
4
Љ,
etc.).
2-PIPE SYSTEM (One Valve Package) or 4-PIPE SYS-
TEM (Two Valve Packages) Application:
• 2 Pipe - Hydronic Heating Only
• 2 Pipe - Hydronic Cooling Only
• 2 Pipe - Hydronic Cooling with Total Electric Heat
• 4 Pipe - Hydronic Cooling and Heating
NOTE: A
1
⁄
4
-in. bypass line is included in the piping pack-
age when a 2-way valve is specified with a control pack-
age containing an automatic changeover device.
Two-Way Motorized Control Valve with
Aquastat Bleed Bypass Line
The 2-way motorized valve motor drives valve open
and a spring returns valve to normally closed position
(no water flow through coil with unit OFF).
The aquastat bleed bypass bleeds a small amount of
water from supply to return when control valve is closed
(required for system water temperature sensing by aqua-
stat). Aquastat (A) clips on supply line upstream from
aquastat bleed bypass (as shown at right). It senses
system water temperature to prevent cooling operation
with hot water in system piping or heating operation with
chilled water in system piping. Additional aquastat re-
quired to lock out the optional auxiliary electric heat when
hot water in system.
Supply and return connections at coil will be swage fit
for field braze (standard) or unions (option).
Check job specifications for system pressure, pres-
sure drop limitations and flow rate prior to selecting valve
package components or valve package size (
1
⁄
2
Љ,
3
⁄
4
Љ,
etc.).
2-PIPE SYSTEM (One Valve Package) Application:
• 2 Pipe - Hydronic Cooling and Heating
• 2 Pipe - Hydronic Cooling and Heating with Auxiliary
Electric Heat
NOTES: Additional aquastat required as noted above.
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