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(2) Pumpless models
(Turn on 12 hours before run)
5 seconds
15 seconds minimum
(*2)
20 second
(*1)
180 seconds
(*5)
Preparation for activating circuits B, C and D
• Activate fans
• Open electric expansion valves
20 seconds
Activate circuits B, C and D compressors
60HP: 169 seconds minimum
60HP (Powerful heating type):
190 seconds minimum
70HP: 190 seconds minimum
(*6)
5 seconds
All electric expansion valves close
15 seconds minimum
(*7)
(*1) All modules are activated simultaneously.
(*2) The external pump pre-operation time is prolonged automatically until the flow volume to each module stabilizes. (Up to 180 seconds; field adjustable)
(*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 lower 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 external pump depends on the low-pressure states of each circuit (180 seconds maximum; field adjustable).
(*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
Crankcase heater powers on
Control circuit board powers on
Run switch ON
External pump of
module activates
Preparation for activating circuit A
• Activate fans
• Open electric expansion valves
Activate circuit A compressor(s)
Operation at maximum capacity
Stop switch ON
All compressors stop
All fans stop
External pump of
module stops
Unit controller display
(Installed in each module)
C O O
H E A
C
0
0
H
0
0
Run indicator
lights up
(*3, 8)
C
*
*
*
H
*
(*8)
*** denotes operation capacity in %.
C
*
*
H
*
*
(*4)
*** denotes operation capacity in %.
C O O
H E A
Run indicator
lights out
- 55 -
Module controller display
(LED)
(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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