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VAV-PRC011M-EN 127
Pneumatic Controls
Optional or installed by others.
Factory installed.
Limiter
Minimum
Restricted Leg
One Pipe Inset
Capped
Diverting
T-Stat Branch Pressure (PSI)
T-Stat Branch Pressure (kPa)
Min
CFM
CFM
Max
100
3
810
M
T
13 15
Min
LPS
LPS
Max
3-8 PSI
100
Customer Notes:
1.
Restrictor
(20.69 - 55.16 kPa)
Valve
(N.O.)
Water
Relay
S
Tee
C
NC
NO
Tee
Tee
Restrictor
Bleed
Restricted Leg
Ports
With an increase in room temperature, the thermostat output pressure is decreased. This signal is input for the volume regulator, which also
receives the 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 (kPa)
T-Stat Branch Pressure (PSI)
Max
CFM
CFM
Min
3
8
10 1513
Stages of Heat
LPS
Min
LPS
Max
M
Terminal Box
Electric Heater
T
Tee
With a decrease in room temperature, the thermostat output pressure is decreased. This signal is input to 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 closes the damper and decreases primary cooling flow to the space. With a further decrease in room
temperature, the auxiliary limit will override the thermostat signal, which is followed by the reheat being energized. Once the reheat has been
energized, the volume regulator will send a signal to the actuator to open to its secondary minimum. With an increase in temperature, the
opposite action occurs. Minimum and maximum airflow settings are maintained by the volume regulator. Heating stages are energized at the
appropriate pressure settings.
(Normal Operation: Cooling with Hot Water Reheat - Auto Dual Minimum)
Normally-Open Damper, Actuator, and 3011 Pneumatic Volume Regulator (Direct-Acting Thermostat)
PN11 – VCWF - Single-Duct Terminal Units
Regulator
Volume
Regulator
Volume
Restrictor
Customer Notes:
1. Factory installed.
One Pipe Inset
Restricted Leg
Tee
Optional or installed by others.
(Normal Operation: Cooling with Electric Reheat)
Normally-Open Damper, Actuator, and 3011 Pneumatic Volume Regulator (Direct-Acting Thermostat)
PN05 – VCCF and VCEF - Single-Duct Terminal Units
% Flow (CFM)
% Flow (CFM)
% Flow (LPS)
% Flow (LPS)
Two Pipe
Remote Mounted
T–Stat
(Direct Acting)
One Pipe
Remote Mounted
T–Stat
(Direct Acting)
Two Pipe
Remote Mounted
T–Stat
(Reverse Acting)
One Pipe
Remote Mounted
T–Stat
(Reverse Acting)
15
(103.4)
20
(137.9)
20
(137.9)
S
S
S
20
(137.9)
S
S
S
20
(137.9)
20
(137.9)
15
(103.4)
20
(137.9)
S
20
(137.9)
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