Sinclair SCV-1400EB, Service Manual

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1 General Control Scheme Flowchart
Note:
1. Numbers in the top right-hand corners of boxes indicate the relevant section of text on the following pages.
Easy control
Conditions met
for defrosting
On
Special control
 Outdoor unit duty cycling

TEMP-SWITCH control
 Defrosting operation
7
Stop operation

Abnormal shutdown

System stops
2
Standby control
 Crankcase heater control
 Water pump control
3
Startup control

Compressor startup delay control
 Startup control for heating operation
 Startup control for cooling operation
4
Normal operation control
 Component control during normal operation
 Compressor output control

Compressor step control
 Water pump select control
 Four-way valve control
 Electronic expansion valve control
 Outdoor fan control
5
Protection control
 High pressure protection control
 Low pressure protection control

Discharge temperature protection control
 Compressor and Inverter Module Protection Control

Voltage protection control
 DC fan motor protection control
 Water side heat exchanger anti-freeze protection control

Air side heat exchanger high temperature protection control
 Water side heat exchanger temperature difference protection control

Water side heat exchanger low temperature protection control
 Water side heat exchanger low pressure protection control
6