Installation and Maintenance
Service Manual
Evaporator
frozen-preventing
protection
function
is
allowed
to
begin after 6 min of starting the compressor.
1. Starting estimation:
After
the
compressor
stopped
working
for
180s,
if
T
inner pipe
>
[T
frozen-preventing frequency-limited temperature
(the
temperature
of
hysteresis
is 2 )], the machine is only allowed to start for operating, otherwise
it should not be started, and should be stopped to treat according
to
the
frozen-preventing
protection:
Clear
the
trouble
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
frozen-
preventing
protect
to
stop
the
machine;
If
T[
frozen-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
frozen-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
keeps
on.
During
the
process
of
running,
if
the
running
time
of
compressor exceeds the t evaporator frozen-preventing protection
times
zero
clearing
time
,
the
times
of
frozen-preventing
power
turn-off
should
be
cleared
to
recount.
The
mode
of
stopping
the
machine
or
transferring
to
supply
air
will
clear
the
trouble
times
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
Cooling
and
dehumidifying
1. Starting estimation:
After
the
compressor
stopped
working
for
180s,
if
T
outer pipe
<[T
Cooling overload frequency-limited temperature
] (the temperature of hysteresis
is 2ºC ), 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
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:
22
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 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 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 been stopped
working for 3 minutes, the machine should be allowed to operate.
6. If the Cooling overload 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
keeps on. 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 times 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 stopped working for 180s, if T inner pipe T
heating overload frequency-limited temperature (the temperature
of hysteresis is 2 ), 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 at the mode of power turn-off / heating, and the
protection times are not counted.
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 till the lower limit;
After it was running 90s at the lower limit, if T heating overload
frequency reducing temperature at normal speed ≤T inner pipe,
then overload protects machine 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 till the lower limit; After it was
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