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VAV-PRC011M-EN 129
Pneumatic Controls
One Pipe Inset
Remote Mounted
(Direct Acting)
T-Stat Branch Pressure (PSI)
T-Stat Branch Pressure (kPa)
Air Flow
Min
CFM
3
8
55.2
20.7
% Flow (CFM)
CFM
Max
100
Water Valve
S
(137.9)
20
10
LPS
Min
103.4
69
89.6
% Flow (LPS)
LPS
Max
100
(137.9)
20
S
Restricted Leg
Restrictor
Tee
T-Stat
One Pipe
Regulator
M
Volume
T
Tee
(20.69 - 55.16 kPa)
(N.O.)
Valve
Water
3-8 PSI
Two Pipe
(Direct Acting)
T-Stat
Remote Mounted
(103.4)
20
15
(137.9)
S
Optional or installed by others.
Customer Notes:
1.
Factory installed.
With an increase in room temperature, the thermostat output pressure is increased. This signal is input for the volume regulator, which also
receives inputs from the high- and low-pressure sides of the flow ring. The volume regulator outputs a signal compensated for changing duct
pressure to the valve actuator, which opens the damper and increases primary cooling flow to the space. With a decrease in room temperature,
the opposite action occurs. Minimum and maximum primary airflow settings are maintained by the volume regulator. When the system is
designed with reheat, heating stages are energized at the appropriate pressure settings.
T-Stat Branch Pressure (PSI)
T-Stat Branch Pressure (kPa)
100
Air Valve
3
8
20.7
55.2
100
Actuator
20
Two Pipe
Remote Mounted
(Reverse Acting)
T-Stat
S
(Normal Operation: Cooling Only)
Normally-Open Damper and Actuator (Reverse-Acting Thermostat)
With an increase in room temperature, the thermostat output pressure is decreased and the actuator opens to increase primary cooling
airflow to the space. With a decrease in room temperature, the opposite action occurs.
(Normal Operation: Cooling with Hot Water Reheat)
Normally-Open Damper, Actuator, and 3011 Pneumatic Volume Regulator (Direct-Acting Thermostat)
PN04 – VCCF and VCWF - Single-Duct Terminal Units
13 15
Factory installed.
Optional or installed by others.
One Pipe
T-Stat
Restricted Leg
(Reverse Acting)
Remote Mounted
One Pipe Inset
1.
Customer Notes:
20
(137.9)
S
Tee
Restrictor
(137.9)
PN00 – VCCF - Single-Duct Terminal Units
% Position (Open)
% Position (Open)
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