Label

Nomenclature

Compressor Voltage

The standards consider the voltage variation of the network to be within +/- 6% of its rated value, nevertheless Cubigel Compressors® design its motors to be able to work within -15% of the lowest rating and +10% of the highest rating.

Type of application

Low Back Pressure (LBP) Compressors.

• Evaporating temperature range: -35 to -10ºC [-31ºF to +14ºF] (down to -40ºC [-40ºF] for refrigerant R404A).
• Rating condition: -25ºC [-13ºF] (CECOMAF) or -23.3ºC [-10ºF] (ASHRAE).

Medium Back Pressure (MBP) Compressors.

• Evaporating Temperature range: -25ºC to 0ºC [-10ºF to 32ºF]

High-Medium Back Pressure (HMBP) Compressors.

• Evaporating Temperature range: -25 to +10ºC [-13ºF to +50ºF].
• Rating condition: +5ºC [+41ºF] (CECOMAF) or +7.2ºC [+45ºF] (ASHRAE).

High Back Pressure (HBP) Compressors.

• Evaporating Temperature range: -15ºC to +10ºC [+5ºF to +50ºF]).
• Rating condition: +5ºC [+41ºF] (CECOMAF) or +7.2ºC [+45ºF] (ASHRAE).

Very High Back Pressure (VHBP) Compressors.

• Evaporating temperature range 0ºC to +25ºC [+32 to +77ºF] with condensing temperature up to +75ºC [+167ºF].
• The rating condition is defined by an internal Cubigel Compressors standard: Te = +10ºC [+50ºF].

SOA - Safe Operating Area

• In order to grant the compressor reliability it is recommended that the compressor always works (suction and discharge pressures) inside the safe operating area represented in shadowed area of the corresponding graph.

Types of electrical starting torque

Starting torque is highly dependent on the impedance connected in series with the auxiliary winding. There are two levels of starting torque:

LST

• Low starting torque (LST) motors are performed by connecting a resistor in series with the auxiliary winding. Resistor can be the intrinsic resistance of the auxiliary winding, built with thinner wire than the main winding wire, or by means of an external resistor called PTC. LST motors are used in compressors operating in appliances that do not require starting under unbalanced pressures because expansion is performed by a capillary tube.

HST

• High starting torque (HST) motors requires a capacitor connected in series with the auxiliary winding. HST motors are used in compressors operating in appliances that require starting under unbalanced pressures because expansion is performed by thermostatic expansion valve.

Types of Electrical Motors

RSIR: Resistance Start-Induction Run

• LST motor.
• No capacitors.
• Auxiliary winding is turned OFF after start up by means of a current relay or PTC.
• Comparatively low cost motor of standard energy efficiency.

CSIR: Capacitor Start-Induction Run

• HST motor.
• With starting capacitor.
• Auxiliary winding is turned OFF after start up by means of a current relay.
• Standard efficiency.

RSCR: Resistance Start-Capacitor Run

• LST motor.
• With running capacitor connected in parallel with a PTC.
• Auxiliary winding remains ON after start up.
• Used for high efficiency in small capacity compressors (particularly in household refrigeration).

CSR: Capacitor Start and Run

• HST motor.
• Two capacitors (starting and running) with potential relay.
• Auxiliary winding remains ON after start up.

CSR + NTC

• A current relay + NTC is used for switching off the starting capacitor.
• Used for high efficiency motors.
• Patented solution.

Wiring Diagrams