CONTROLLER
1
The CAL24A Series is a stand alone microprocessor based controller,
providing 0-10V DC control. This series controls a variety of two-
pipe and four-pipe air-handling units, heat pumps unitary equipment
and various heating and cooling applications controlled by valve,
damper and fan systems.
Supply Voltage: 24 VAC +/- 15%, 50-60 Hz
Outputs: 0-10 VDC
Power Consumption:
24 VAC, 2VA
Deadband: -3бн+3K
Setpoint Range: 0бн30
o
C
Shipping Weight:
105 g
CAL24A1 Single output
0-10 VDC
CAL24A2 Dual output
0-10 VDC
The P74JA Series differential pressure controller is commonly used
on water systems to control a pressure differential between supply
and return lines. The controller's SPDT floating action contacts
position a modulating valve operated by a motor-driven actuator. In a
typical application the valve is located in a bypass line around the
system pump. When the system pressure differential increases
above the controller's set point, the valve opens further. More water
is diverted through the bypass valve, resulting in a reduction in
system pressure differential. A reduction in the pressure differential
causes the valve to begin closing and results in an increase in
system pressure differential.
Range: 55бн414 kPa (8бн60 PSI)
Operating Pressure Differential: 14 kPa (2 PSI), fixed
Max. Bellows Overrun Pressure: 1241 kPa (180 PSIG)
Max. Allowable Differential in
Pressure Between Bellows: 830 kPa (120 PSI)
Electrical Ratings: 1 Ampere, 24 V, 50 / 60 Hz
Switch Action: SPDT, totally enclosed
non-snap acting switch
Ambient Operating Temperature: -1бн60
o
C
Mounting: Mounts to flat surface
Wire Terminals: Color coded screw terminal
Shipping Weight:
1.1 kg (2.4 lb)
P74JA-3
SPDT, totally enclosed non-snap acting switch
The CAL24T Series microprocessor based controller provides com-
binations of on/off and 3-wire floating (incremental) control. This se-
ries controls a variety of two pipe air handling units, heat pumps, uni-
tary
equipment and various cooling and heating applications.
Supply Voltage:
24 VAC +/- 15%, 50-60 Hz
Outputs:
24 VAC, 12 VA
Power Consumption:
24 VAC, 1 VA
Setpoint Range:
0бн30
o
C
Ambient Limitations:
0бн50
o
C, 90% RH
Shipping Weight:
100 g
CAL24T Single output
24VAC, 12VA