136
CONTROL
4. Warm-up start
When the remote controller starts the system, the control system gives priority to keeping engine coolant
temperature at a certain level within 15 minutes after engine start. To do so, the control system controls the
hot gas bypass valve with engine coolant temperature and refrigerant low pressure.
For details, refer to Refer to P139, [ â‘£ Hot gas bypass valve control].
3) Transition from Start Control to Normal Operation Control
Start control transitions to normal operation control when any of the following conditions is met.
4) Indicated Engine Speed
1. Indicated engine speed range during temperature control
Refer to P136, [ â‘ Refrigerant flow volume control by apparent engine speed] for the indicated engine
speed during temperature control.
5) Refrigerant Flow Volume
â‘ Refrigerant flow volume control by apparent engine speed
1. Concept of apparent engine speed
To simplify the calculation of refrigerant flow volume control, the following "apparent engine speed" is
introduced in engine speed control during normal operation in temperature control operation.
(1) Apparent engine speed, indicated engine speed, compressor capacity control valve open position,
and status of electromagnetic compressor capacity valve
After completion of switching the reversing valve. (When the reversing valve switching is activated.) OR
After completion of engaging the compressors by the number specified at starting. (When the reversing
valve switching is not activated.)
<< 8 TON Cooling >>
Number of operating
compressors
Apparent engine
speed (rpm (min
-1
))
Engine speed (rpm (min
-1
))
(950P)
Electromagnetic
compressor capacity
valve 1
Electromagnetic
compressor capacity
valve 2
2
1700 ERPMmax = 1700 OFF OFF
1500 1500 OFF OFF
1000 1000 OFF OFF
800 800 OFF OFF
750 1000 ON OFF
700 950 ON OFF
650 900 ON OFF
600 800 ON OFF
550 1000 ON ON
500 950 ON ON
450 900 ON ON
400 850 ON ON
350 ERPMmin = 800 ON ON
1 350 1200 ON OFF
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