SZ 7574/ 7575/ 7576

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These are panel mounted controllers dedicated for controlling Package AC units for Single & Multi cooling units.
Safety Features:

  • It protects compressor by tripping on HP/LP, OL, SPP fault.
  • It protects codensor & blower fan by tripping on OL, SPP fault.

  • It controls Compressor, Condenser and Blower
  • Buzzer for fault indication.
  • HP/LP,OL,SPP trip protection for compressor.
  • Overload protection for condenser & blower.

Temp. Sensor Input 1 : NTC for Package unit.

  • Temperature range 0°C to 50°C
  • 230VAC Standard. 110VAC on request.
  • Panel cutout : 92 X 92 mm
  • Screw terminals : Admit 1X 2.5mm²wire

Mega Chill

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The Subzero ‘MEGA CHILL’ is a controller that integrates all the control functions required by a chiller. It is a complete, independent, rugged and highly reliable unit. It is one of the most efficient chiller controller of it’s kind in the country with the kind of features it provides.

A user friendly LCD screen displays all parameters and message alarms on the display. In addition to the LCD there are LED’s provided for instant status of all controls in the system. The Mega Chill controller allows you to manage refrigeration units having different configurations.

The parameters are protected with a hardware key known as ”PROKEY”. Without prokey user cannot change parameters, but can view the parameters. This prevents any unauthorized access to the parameters.

  • 7 segment LED display & LCD with backlight to display all parameters and control status.
  • Audible alarm with LCD message for all faults.
  • HP/LP/OL/OSS trip protection for compressor.
  • Overload trip protection for pump and condenser.
  • Regulates water level via water solenoid valve.

  • Analog Inputs : 6 NTC probes for CONTROL, E/INLET, E/OUTLET, C/INLET, C/OUTLET, AFT.
  • Digital Inputs : HP, LP, OSS, AFT, Comp O/L, Pump O/L, CCH, Cond. O/L, SSP, CWFS, EWFS, Bitzer comp O/L, R, Y, B, Medium Water Level, Low Water Level.
  • Relay Outputs : Pump, Compressor, Condenser Fan, Alarm, Water Solenoid Valve, Bitzer Comp Reset, Liquid SV.

  • Temperature range -30°C to 50°C(resolution: 0.5°C).
  • 230VAC Standard. 110VAC on request.
  • Panel cutout : 92 X 92 mm.
  • I/O Board size : 150 X 243 mm for Input/Output Board.

SZ 7556P-D

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  • Switch off compressor on the difference between control & reference temp.
  • Provision to switch off compressor on Low Temperature (LT).

  • Relay output : 8(3)A.
  • Alarm Relay output : 5A.
  • Temp. Sensor Input 2 : NTC.

Oil Chillers, Panel A/C’s & similar applications.

  • Temperature range 0°C to 70°C.
  • 230VAC Standard. Other models with 12VDC, 24VDC, 110VAC on request.
  • Panel cutout : 29 X 71 mm.
  • Screw terminals : Admit 1X 2.5 mm² wire.

SZ 7552P / 7562P

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  • Individual set points, differentials and time delays.
  • Cycling of compressors to avoid overloading one compressor.
  • Activate second compressor incase first compressor is not able to handle the load.
  • An internal 10sec time delay is provided to avoid simultaneous startups of compressors & a similar option for switching off as well to prevent an electrical surge.
  • Software keypad lock to avoid parameter tampering by bystanders.

  • Relay output : 8(2)A for two Compressors.
  • Temp. Sensor Input : 1 NTC Probe.

For 2 independent cooling units with one temperature sensor.

  • Temperature range 0°C to 50°C (SZ 7552P) & -50°C to 99°C (SZ 7562P).
  • 230VAC Standard. Other models with 12VDC, 24VDC, 110VAC on request.
  • Panel cutout : 29 X 71 mm Screw terminals : Admit 1X 2.5 mm² wire.

SZ 7514P

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  • Switch off compressor at setpoint.
  • Manual reset is required to re-start.
  • Buzzer output on achieving antifreeze set point.

  • Relay output : 8(3)A.
  • Buzzer output : 10VDC, 10mA Max.
  • Temp. Sensor Input : 1 NTC with ½’’ BSP connection.

Chiller machines.

  • Temperature range -50°C to +50°C.
  • 230VAC Standard. Other models with 12VDC, 24VDC, 110VAC on request.
  • Panel cutout : 29 X 71 mm. Screw terminals : Admit 1X 2.5 mm² wire.

SZ 7512P

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  • Switch off compressor at setpoint.
  • Manual reset is required to re-start.
  • Buzzer output on achieving antifreeze set point.

  • Relay output : 8 (3)A.
  • Buzzer output : 10VDC, 10mA Max.
  • Temp. Sensor Input : 1 NTC with ½’’ BSP connection.

Chiller machines.

  • Temperature range -50°C to +50°C.
  • 230VAC Standard. Other models with 12VDC, 24VDC, 110VAC on request.
  • Panel cutout : 29 X 71 mm. Screw terminals : Admit 1X 2.5 mm² wire.