2. Control Functions
Control functions on the module
SMGB0082 rev.1 - 07/2015
15
2
2.1.3 Compressor Control
1 Startup control
The chiller unit receives an operation order, the cool (hot) water pump starts up, and after interlock is complete and
compressor delay time (initial setting: 0.5 minutes) has passed, compressor is started up. In continuous control type,
startup takes place in a state in which the slide valve is moved to the smallest load position.
Compressor delay time can be adjusted. Change the setting value to one which is adequate for the local facilities, to
avoid compressor startup before ensuring a sufficient cold water flow.
2 Normal
Operation is performed with the smallest load for 1 minute after compressor startup.
After finishing startup control, control is shifted to normal water temperature control.
3 Stop
a. At Themo OFF
Continuous control type stops suddenly. At this time, the compressor sounds as if it was counter-rotating, due to the
pressure differential between high and low pressure.
b. Upon alarm (including retry) · momentary power failure · reception of stop order
Stops suddenly. At this time, the compressor sounds as if it was counter-rotating, due to the pressure differential
between high and low pressure.
Time chart
Operation
order
ON (Chiller reception)
Fulfilled
Count start
Count up
Start up control (1 minute)
Shift to normal control
Delay time setting
Pump
interlock
Compressor
operation
Compressor delay
time count
