Johnson Controls DCX18CSB21S, Service Manual

Page: 34 / 90

2 6
Technical Information
Service Manual
1. Frequency limited
If [T
heating overload frequency-limited temperature
]≤T
inner pipe
<[T
heating overload frequency reducing temperature at normal speed
], you should limit the frequency raising of
compressor.
2. Reducing frequency at normal speed and stopping machine:
If T[
heating overload frequency reducing temperature at normal speed
]≤T
inner pipe
<[T
heating overload frequency reducing temperature at high speed
], you should adjust the compressor
frequency by reducing 8Hz/90s until the lower limit . After it runs for 90s at the lower limit, if T heating overload frequency reducing
temperature at normal speed ≤T inner pipe, then overload protects machine from stopping .
3. Reducing frequency at high speed and power turn-off:
If [T
heating overload frequency reducing temperature at high speed
]≤T
inner pipe
<[T
heating overload power turn-off temperature
], you should adjust the compressor frequency by
reducing 30Hz/90s until the lower limit . After it runs 90s at the lower limit, if T heating overload frequency reducing temperature at normal
speed ≤T outer pipe, then c ooling overload protects machine from stopping .
4. Power turn-off:
If the [T
heating overload power turn-off temperature
] ≤T
inner pipe
, then overload protects machine from stopping . If T inner pipe T heating overload frequency-
limited temperature and the compressor has stopped working for 3 minutes, the machine should operate.
5. If the overload protection power turn-off continuously occurs for six times, it should not be resumed automatically . P ress
the ON/OFF button to resume if the fault continues . During the process of running, if the running time of compressor exceeds the t overload
protection times zero clearing time, the times of overload protection power turn-off should be cleared to recount. The mode of stopping the
machine or transferring to supply air will clear the trouble
instances immediately (if the trouble can not be resumed, transferring mode will not
clear it). Protective function for discharge temperature of compressor
1. Starting estimation:
After the compressor stop s working for 3min , if T
Discharge
<T
Discharge limited temperature
(the temperature of hysteresis is 35.6ºF ), the machine is
allowed to start . O therwise it should not be started, and should be stopped to treat according to the discharge temperature:
The machine should be stopped or transferred to supply air, the trouble instances should be cleared immediately, and the protection
times are not counted.
2. Frequency limited
If [T
Limited frequency temperature during discharging
] ≤T
Discharge
<[T
frequency reducing temperature at normal speed during discharging
], you should limit the frequency raising of
compressor.
3. Reducing frequency at normal speed and stopping machine:
If [T
frequency reducing temperature at normal speed during discharging
] ≤T
Discharge
<[T
frequency reducing temperature at high speed during discharging
], you should adjust the
compressor frequency by reducing 8Hz/90s till the lower limit . After it runs 90s at the lower limit, if [T
frequency reducing temperature at normal speed during
discharging
] ≤T
Discharge
, you should discharge to protect machine from stopping .
4. Reducing frequency at high speed and power turn-off:
If [T
frequency reducing temperature at high speed during discharging
] ≤T
Discharge
<[T
Stop temperature during discharging
], you should adjust the compressor frequency
by reducing 30Hz/90s till the lower limit . After it runs 90s at the lower limit, if [T
frequency reducing temperature at normal speed during discharging
] ≤T
Discharge
, you
should discharge to protect machine from stopping .
5. Power turn-off:
If the [T
Power turn-off temperature during discharging
] ≤T
Discharge
, you should discharge to protect machine from stopping . If [T
Discharge
]<[T
Limited frequency temperature
during discharging
] and the compressor has been stopped for 3 minutes, the machine should be allowed to operate.
6. If the discharging temperature protection of compressor continuously occurs for six times, it should not be resumed automatically .
P ress the ON/OFF button to resume. During the process of running, if the running time of compressor exceeds the t Protection times clearing
of discharge, the discharge protection is cleared to recount. Stopped or transferred to supply air mode will clear the trouble instances
immediately (if the trouble can not be resumed, mode transferring also will not clear it).
7. Frequency limited
If [I
Limited frequency when overcurrent
] ≤I
AC Electric current
<[I
frequency reducing when overcurrent
], you should limit the frequency raising of compressor.
8. Reducing frequency:
If [I
Frequency reducing when overcurrent
] ≤[I
AC Electric current I Power turn-off when overcurrent
], you should reduce the compressor frequency till the lower limit or exit
the frequency - reducing condition .
9. Power turn-off:
If [I
Power turn-off machine when overcurrent
] ≤[I
AC Electric current
], you should carry out the overcurrent stopping protection; If I
AC Electric current
<[T
Limited frequency when
overcurrent
] and the compressor has been stopped for 3 minutes, the machine should be allowed to operate.
10. If the overcurrent protection continuously occurs for six times, it should not be resumed automatically . P ress the ON/OFF
button to resume. During the process of running, if the running time of compressor exceeds the [t
Protection times clearing of over current
], the discharge
protection is cleared to recount.