Johnson Controls DCX18CSB21S, Service Manual

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Technical Information
Service Manual
1. Starting estimation:
After the compressor stopped working for 3min , if T
inner pipe
> [T
frozen-preventing frequency-limited temperature
(the temperature of hysteresis is 35.6ºF )], the
machine is only allowed to start for operating, otherwise it should not be started, and should be stopped to treat according to the freeze -
preventing protection: Clear the trouble instances under the mode of power turn-off / heating, and the protection times are not counted.
2. Frequency limited
[T
frozen-preventing normal speed frequency-reducing temperature
] ≤[T
inner pipe T frozen-preventing frequency-limited temperature
], you should limit the frequency raising of
compressor.
3. Reducing frequency at normal speed:
If [T
frozen-preventing high speed frequency-reducing temperature
] ≤[T
inner pipe T frozen-preventing normal speed frequency-reducing temperature
], you should adjust the compressor
frequency by reducing 8Hz/90s till the lower limit .
4. Reducing frequency at high speed:
If [T
frozen-preventing power turn-off temperature
] ≤T
inner pipe
[T
frozen-preventing high speed frequency-reducing temperature
] you should adjust the compressor frequency by
reducing 30Hz/90s till the lower limit .
5. Power turn-off:
If the T
inner pipe
<[T
frozen-preventing power turn-off temperature
], then freeze -preventing protect to stop the machine . If T[
freeze -preventing frequency-limited
temperature
] <T
inner pipe
, and the compressor has stopped working for 3 minutes, the whole machine should be allowed to operate.
6. If the freeze -preventing protection power turn-off continuously occurs for six times, it should not be resumed automatically, and you should
press the ON/OFF button to resume if the fault continues . During the process of running, if the running time of compressor exceeds the
t evaporator freeze -preventing protection times zero clearing time, the times of freeze -preventing power turn-off should be cleared to
recount. The mode of stopping the machine or transferring to supply air will clear the problem instances immediately (if the trouble can
not be resumed, mode transferring will not clear it).
(5) Overload protection function
Overload protection function at the mode of c ooling and dehumidifying
1. Starting estimation:
After the compressor stopped working for 3min , if T
outer pipe
<[T
Cooling overload frequency-limited temperature
] (the temperature of hysteresis is 35.6ºF ), the
machine is allowed to start, otherwise it should not be started, and should be stopped to treat according to the overload protection: Clear the
trouble
instances at the mode of power turn-off / heating, and the protection times are not counted.
2. Frequency limited
If [T
Cooling overload frequency-limited temperature
] ≤[T
outer pipe T Cooling overload frequency reducing temperature at normal speed
], you should limit the frequency raising of
compressor.
3. Reducing frequency at normal speed and power turn-off:
If [T
Cooling overload frequency reducing temperature at high speed
] ≤T
outer pipe
< [T
Cooling overload power turn-off temperature
] , you should adjust the compressor frequency
by reducing 8Hz/90s till the lower limit . After it was running 90s at the lower limit, if [T
Cooling overload frequency reducing temperature at normal speed
]≤T
outer pipe
,
then Cooling overload protects machine from stopping .
4. Reducing frequency at high speed and stop machine:
If [T
Cooling overload frequency reducing temperature at high speed
]≤T
outer pipe
[T
Cooling overload power turn-off temperature
], you should adjust the compressor frequency by
reducing 30Hz/90s till the lower limit . After it was running 90s at the lower limit, if [T
Cooling overload frequency reducing temperature at normal speed
] ≤[T
outer pipe]
,
then Cooling overload protects machine from stopping .
5. Power turn-off:
If the [T
Cooling overload power turn-off temperature
] ≤T
outer pipe
, then Cooling overload protects machine stopping; If [T
outer pipe
]<[T
Cooling overload frequency-limited
temperature
]and the compressor has stopped working for 3 minutes, the machine should be allowed to operate.
6. If the c ooling overload protection power turn-off continuously occurs for six times, it should not be resumed automatically .
Pr ess 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 in order to recount.
The mode of stopping the machine or transferring to supply air will clear the problem instances immediately (if the trouble can not be
resumed, transferring mode will not clear it).
Overload protection function at the mode of heating
Starting estimation:
After the compressor stop s working for 3min , if T inner pipe T heating overload frequency-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 overload protection:
Clear the trouble
instances at the mode of power turn-off / heating, and the protection times are not counted.