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46
BALL VALVE
GATE
SHUT OFF
(1) GATE
(1) BALL
(1) 2-WAY MOTORIZED
R
S
COIL
BALL VALVE
BALL VALVE
(2) BALL
(1) BALANCING
(1) 2-WAY MOTORIZED
R
S
COIL
CIRCUIT SETTER
BALL VALVE
(1) BALL
(1) CIRCUIT SETTER
(1) 2-WAY MOTORIZED
R
S
COIL
MOTORIZED
2-WAY VALVE
A
BYPASS
BALANCING
VALVE
A
MOTORIZED
2-WAY VALVE
BYPASS
A
MOTORIZED
2-WAY VALVE
BYPASS
M
M
M
Fig. 44 — Two-Way Motorized Control Valve Package
Fig. 45 — Two-Way Motorized Control Valve Package 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 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, pressure drop
limitations and flow rate prior to selecting valve package
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
• 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 package
containing an automatic changeover device.
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 aquastat).
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 required 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, pressure drop
limitations and flow rate prior to selecting valve package
components or valve package size (
1
/
2
in.,
3
/
4
in., 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.
LEGEND
Ball Valve
Motorized 2-Way Valve
LEGEND
Balancing Valve
Ball Valve
Circuit Setter
Gate Shut Off Valve
Motorized 2-Way Valve
M
MOTORIZED
MOTORIZED
a42-4174
MOTORIZEDMOTORIZED
M
a42-4175