American Standard CH530 manual Unit mounted devices

Control System Components

Unit mounted devices

Vane Actuator Control

The Stepper Module within the stepper vane actuator (4M2) (and 4M4 extended capacity) pulses a DC voltage to the windings of the Stepper Motor Actuator(s) to control inlet guide vane position. While operation of this stepper motor is automatic, manual control is possible by going to the Mode Overrides settings menu within the DynaView™. Compressor Control Signal allow the operator to manually increase or decrease the compressor load by adjusting the compressor control signal.

Note: If the chiller is operating in a limit mode (current limit, condenser limit, evaporator limit, etcetera.) The limit operation has priority over all DynaView™ manual modes of operation.

On each UCP power-up, the inlet guide vanes are driven full closed to recalibrate the zero position (Steps) of the Stepper motor vane actuator.

Temperature sensors,

Evaporator sensors 4R6 and 4R7, and condenser sensors 4R8, 4R9 entering and leaving, bearing temperature sensors 4R1, 4R2, oil temperature sensor 4R5, outdoor air temperature 4R13, and evaporator 4R10 and condenser 4R11 saturated refrigerant temperature sensors.

Probe Operating Temperature Range - 40 to 250°F (-40 to 121oC)

Accuracy +/- 0.25oC over the range -4 to 122°F (-20 to 50oC), +/- 0.50oC over the range -40 to 250°F (-40 to 121oC)

Power and Communications and Terminations Power 24 +/- 10% VDC, 20 mA maximum.

Trane IPC3 protocol Communications.

Pressure sensors

Oil tank sump 4R4 and oil pump discharge 4R3, evaporator and condenser refrigerant pressure 4R22, Working Pressure Range: 0 to 50 Psia Accuracy: ± 0.3% of full scale output at 68°F (20°C)

Power and Communications and Terminations

Power 24 +/- 10% VDC, 20 mA maximum.

Communications, RS485 Physical Layer, 19.2 Kbaud, Trane IPC3 protocol.

Starter Module

In the hierarchy of modules the Starter module 2A1 (1A23 when customer supplied starter specified) is second only to the DynaView™. The starter module is present in all starter selections (except AFD) .This includes Wye Delta, Across the Line, Solid State whether remote unit mounted or supplied by others. The starter module provides the logic to provide the motor protection for Current overload, phase reversal, phase loss, phase imbalance, and momentary power loss. These functions are discussed in the motor protection section of this manual.

EarthWise™ Purge

Trane has also revolutionized its controller-integrated purge, which features an automatic regeneration system for high-efficiency, maintenance-free refrigerant containment. Air and noncondensables are pumped out faster, and the lower temperature refrigeration system enhances the base purge efficiency. See EarthWise purge operation and maintenance manual for details.

Unit-mounted medium - voltage starter

Take advantage of Tracer CH530’s new starter and save space in your equipment room. There is no need for a remote or floor-mounted starter with our new, exclusive unit- mounted medium - voltage starter from Cutler-Hammer.

The following two figures illustrate the typical location of various standard and optional unit mounted control and sensor devices.

64 CDHF-SVU01C-EN