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7. Unit start-up/stop flowchart
(1) Models with an internal inverter pump
(Turn on 12 hours before run)
Crankcase heater powers on
Control circuit board powers on
5 seconds
15 seconds minimum
(*2)
20 seconds
(*1)
180 seconds
(*5)
Preparation for activating circuits B, C and D
• Activate fans
• Open electric expansion valves
20 seconds
60HP: 169 seconds minimum
Activate circuits B, C and D compressors
60HP (Powerful heating type):
190 seconds minimum
70HP: 190 seconds minimum
(*6)
Operation at maximum capacity
5 seconds
15 seconds minimum
(*7)
(*1) The number of modules to be operated simultaneously is determined according to the required flow rate on the load side. (When the required flow rate is
large, all modules starts at the same time.)
(*2) The internal pump pre-operation time is prolonged automatically until the flow volume to each module stabilizes.
(*3) The circuit with the shortest compressor runtime is activated first. (In the above example, the compressor runtime for circuit A is the shortest.)
(*4) The number of simultaneously activated circuits depends on the leaving water temp. of each module. (If the leaving water temp. is much higher than the
setpoint, other circuits are activated at the same time.)
(*5) For continually high-load applications such as computer cooling, the pump may be customized to shorten this period. (For details, contact Toshiba Carrier.)
(*6) Minimum periods taken for compressors to reach the maximum operation frequency after start-up (May be longer depending on leaving water temperature.)
(*7) The remaining operation time of the internal pump depends on the low-pressure states of each circuit (up to 180 seconds).
(*8) The operating capacity may be suppressed due to conditions at the time of activation, and the time required to reach the maximum operating capacity may
be become long. Furthermore, when the heating operation is performed, the fans may be stopped to protect the compressor and activation may occur under
the condition of the expansion valves being closed.
Preparation
Turn each power source
switch on
Power indicator lights up
Run switch ON
Internal pump of
module activates
Preparation for activating circuit A
• Activate fans
• Open electric expansion valves
Activate circuit A compressor(s)
Stop switch ON
All compressors stop
All fans stop
All electric expansion
valves close
Internal pump of
module stops
Unit controller display
(LED)
(Installed in each module)
C O O
H E A
C
0
0
H
0
0
Run indicator
lights up
(*3, 8)
(*3)
C
*
*
H
*
*
(*8)
*** denotes operation capacity in %.
C
*
*
H
*
*
(*4)
*** denotes operation capacity in %.
C O O
H E A
Run indicator
lights out
- 54 -
Module controller display
(Installed in representative module)
Main screen (example)
L
Cooling
t
Heating
0
Cooling
0
Heating
*
*
Cooling
*
*
Heating
*
*
Cooling
*
*
Heating
L
Cooling
t
Heating
(LCD)
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