Thermal Super Heat Controller

Overview

The Microstaq Thermal Superheat Controller (TSHC) is a device that is used to control a Silicon Expansion Valve (SEV). External components include only temperature sensors.  No pressure sensor is included or required.

The TSHC functions to control superheat. The TSHC provides a cost-effective solution for improved performance, and efficiency in air conditioning, heat pump and refrigeration systems.

The sensing and control capabilities of the TSHC can be used to adjust flow through a SEV so that the user can maintain desired system conditions.

Key Features

  • Configurable settings to support a range of applications.
  • Fault Detection including sensor faults, high/low superheat, low refrigerant charge.
  • Simple electronic control

Benefits
Microstaq’s technology and product capability aligns well with the global trends in HVAC and refrigeration, allowing manufacturers and retailers to provide:

  • More energy efficient systems
  • Lower maintenance
  • Improved system reliability

Ideal Applications

Specifications

 Compatible Refrigerants

 R410a, R404a, R134a, R22, R17a

 Compatible Oils

 No contact with refrigerant or oil is made.

 Functions

 Measurement of temperature and calculation of superheat

 Maintenance of set point within ± 2°F

 Maximum Working Pressure

 NA – Temperature Based

 Life Expectancy

 10 years

 Supply Voltage

 12 VAC/DC +/- 15%;  24VAC/DC +/- 15%.  AC or DC operation must be specified when  ordering.

 Communication I/O

 TIA 232 with 9 pin D-shell to TSHC adapter cable.  TIA 232 must be electrically  isolated from TSHC power supply.

 Power Consumption 

 Idle ~

 < 1.2W (Unpowered when  compressor is off)

 Operating

 < 20W including valve power

 Plug-in Connectors

 Power input connector, ¼” male push-on connector.  Other connectors provided with  the SEV, TIA 232 interface cable and thermistors. 

 Marking

 Serial number label on the PC board

 Temperature

 Storage

 -40 to 105C 

 Operating

 -40C to 80C

 Humidity

 0 – 100% non-condensing

 Weight

 27g

 Mounting

 4 x #6 screws with standoffs

 Temperature Sensor Input  Range

 0-50 degrees C

 Valve Drive Output

 Pulse-width-modulated (PWM): 0-100%

 Digital Input

 Operator control via electrically isolated TIA 232 using a terminal emulation program.    Control may be discontinued once unit is set up for correct operation.