T9275A Temperature Controller

APPLICATION

This standalone microprocessor based LCD temperature controller provides proportional plus integral (P+I) and on/off temperature control for commercial Heating, Ventilating and Air Conditioning systems such as Hydronic Heating, Air Handling Unit, Heating Exchanger or Condensing Tower.
The T9275A1002 has a modulating analog 2 to 10Vdc or 4 to 20mA output and a 2A on/off output to realize various optional control functions including cool/heat changeover, cool/heat sequence control, emergency interlocking and auto-alarming control.

FEATURES
• PI (proportional plus integral) control action provides accurate, stable and comfortable temperature control.
• Be able to use with series 70 direct-coupled damper actuator or valve actuators like ML7420, ML7421 or ML7984.
• Big bakclit LCD to display both setting and measured value together features friendly user interface.
• Adjustable Zero Energy Band, On/Off Differential, Proportional Band and Temperature Offset.
• Analog output is manually setting available to be convenient for installation commission
• Optional 2 to 10Vdc or 4 to 20mA and reversible analog output
• Selectable internal and external temperature sensor.
• Match with Honeywell standard NTC20 temperature sensors.
• Wide temperature control range (–20 to 1100C by using external temperature sensor) is suitable for extreme temperature control such as steam and ice water.
• Meet various mounting requirements—direct wall mounting, front panel mounting and standard DIN rail mounting.
• Selectable horizontal or vertical wiring direction.
• Pluggable terminal block allows pre-wiring outside of the controller.
• Concisely designed push button for easy operation
• Compact size and slim design provide elegant and attractive modern style appearance.

SPECIFICATIONS
IMPORTANT: The specifications given in this publication do not include normal manufacturing tolerances. Therefore, this unit may not exactly match the listed specifications. Also, this product is tested and calibrated under closely controlled conditions and some minor differences in performance can be expected if those conditions are changed.
 

MODELS:
T9275A provides 4 to 20mA or 2 to 10Vdc Proportional plus Integral modulating control and 4(2)A On/Off control.

DIMENSIONS:
See Figure 1.

MOUNTING:
T9275A1002 temperature controller is fit for following mounting methods:
• Direct wall mounting with standard electrical mounting box.
• Front panel mounting with available installation elements
• DIN rail mounting.
TERMINALS:
Plug-in screw terminals are suitable for no. 20AWG wire.
POWER SUPPLY:
AC24V + 20%, 50/60Hz, 2VA.
OPERATING AMBIENT:
0-600C, 5-95%RH
ACCURACY:
0.10C
SETPOINT RANGE
10-600C (internal temperature sensor)
-20-1100C (external temperature sensor)
REMOTE SENSOR:
NTC20, Maximum 50m cable length (line resistance < 4.5Ω)
ANALOG OUTPUT:
2 to 10Vdc or 4 to 20mA
DIGITAL OUTPUT:
2A, 24Vac
IP CODE:
IP30
OPERATING PARAMETER