13
Technical Information
Service Manual
1.3.3 Outdoor fan control in heating mode
The outdoor fan starts before 5s of the
compressor starting
and then it will run in high speed for 40s
.
The fan
will
run at every speed for at least 80s
.
When the compressor stops, the outdoor fan stops after 1min.
1.3.4 Defrosting function
When the defrosting condition is met,
the compressor
slows down
;
the electronic
expansion valve of all indoor
units open;
and
the outdoor fan stops after 40s
.
The compressor slows down and the reversing valve de-energizes. The compressor then
speeds up and the indoor unit will stop the indoor fan.
T
hen begin to
calculate the time of defrosting
.
T
he frequency of the
compressor rises to reach the defrosting frequency.
1.3.5 Oil-returned control in heating mode
1.3.5.1 Oil-returned condition
The whole unit is operating in low frequency for
factory preset time.
1.3.5.2 Oil-returned process in heating mode
The indoor unit displays “H1”
1.3.5.3 Oil-returned finished condition in heating mode
The
time
reaches 5min
.
1.4 Fan Mode
The compressor, the outdoor fan and the 4-way valve are
de-energized
; temperature setting range is
80.6°F - 86°F (
16
°C
-
30
ć
)
.
2. Protection Function
2.1 Mode Conflict Protection of indoor unit
When the setting mode is different
than the
indoor unit, the unit runs in below status:
a. The mode of the first operating indoor unit is the basic mode, then compare the mode of the other indoor units to see if there
is a conflict. Cooling mode (dry mode) is in conflict with heating mode.
b. Fan mode is in conflict with heating mode and the heating mode is the basic mode. No matter which indoor unit operates first,
the unit will run in heating mode.
2.2 Overload protection function
When the
discharge
tube temperature is a little low,
the compressor raises the operation frequency; when the
discharge
tube
temperature is a little
high, the compressor frequency
is restricted
or
lowers
the operation
frequency;
when the
discharge
tube
temperature
is too high,
the compressor protection stops running.
If the discharge temperature protection continuously
appears for
6 times,
the compressor
can’t
resume
running.
The
compressor can resume running after
resetting of the main
power.
If
the running time
of the compressor is longer than
7min, the
number of
protection times record will be cleared
.
2.3 Discharge Protection Function
When the discharge temperature is a little low,
the compressor raises the operation
frequency; when the discharge
temperature
is a little high, the compressor frequency is restricted or
decreases
the operation frequency; when the discharge temperature is
too high, the compressor protection stops running.
If the discharge temperature protection continuously
appears for
6 times,
the compressor
can’t
resume
running.
The
compressor can resume running after cutting off
the power and then putting through the power.
If
the running time
of the
compressor is longer than 7min, the protection times record will be cleared
.
Summary of Contents for DHW18CMB21S
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