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Protection
Protection is the same as that under the cooling mode.
(3) Heating Mode
Working conditions and process of heating
If T
amb.
T3.6
, the unit enters heating mode, in which case the four-way valve, the compressor and the outdoor fan
will operate simultaneously, and the indoor fan will run at preset speed in the condition of preset cold air prevention.
If T
amb.
T
preset
+9
, the compressor will stop, the outdoor fan will stop with a time lag of 60s, and the indoor fan will stop after
60- second blow at low speed
If T
preset
+3.6
<T
amb.
< T
preset
+9
, the unit will maintain its original operating status.
Under this mode, the four-way valve is energized and temperature can be set within a range of 61 - 86 . The operating
symbol, the heating symbol and preset temperature are revealed on the display.
Condition and process of defrost
When duration of successive heating operation is more than 45 minutes, or accumulated heating time more than 90 minutes, and
one of the following conditions is reached, the unit will enter the defrost mode after 3 minutes.
At that time, the indoor fan stops and the compressor stops, and after 60 seconds the outer fan will stop, and then after 30
seconds, the four-way valve will stop. After 30 seconds, the compressor is initiated for raising the frequency to defrost freq u ency.
When the compressor has operated under defrost mode for 10 minutes, or T
outer tube
50
̧
, the compressor will be converted to 46Hz
operation. After 30 seconds, the compressor will stop. And after another 30 seconds, the four-way valve will be opened, and af t er
60 seconds, the compressor and the outer fan will be started, the indoor fan will run under preset cold air prevention conditio ns,
and H1 will be displayed at temperature display area on the display panel. Defrost frequency is 70Hz.
3.Protection
Cold air prevention
The unit is started under heating mode (the compressor is ON):
In the case of T
indoor amb.
<75
: if T
tube
104 and the indoor fan is at stop state, the indoor fan will begin to run at low speed with
a time lag of 2 minutes. Within 2 minutes, if T
tube
>104
, the indoor fan also will run at low speed; and after 1-minute operation at
low speed, the indoor fan will be converted to operation at preset speed. Within 1-minute low speed operation or 2-minute non-
operation, if T
tube
>108
, the fan will run at present speed.
In the case of T
indoor amb.
75
: if T
tube
108
, the indoor fan will run at low speed, and after one minute, the indoor fan will be
converted to preset speed. Within one-minute low speed operation, if T
tube
>104
, the indoor fan will be converted to preset speed.
Note: T
indoor amb.
indicated in
and
refers to, under initially heating mode, the indoor ambient temperature before the command to
start the compressor is performed according to the program, or after the unit is withdrawn from defrost, the indoor ambient temperature
before the defrost symbol is cleared.
Total current up and frequency down protection
If the total current I
total
16A, frequency rise will be allowed; if I
total
17A,frequency rise will not be allowed; if I
total
18A,the compressor
will run at reduced frequency; and if I
total
20A, the compressor will stop and the outdoor fan will stop with a time lag of 60s.
(4) Fan Mode
Under the mode, the indoor fan will run at preset speed and the compressor, the outdoor fan, the four-way valve and the electric
heater will stop.
Under the mode, temperature can be set within a range of 61 - 86
.
(5) AUTO Mode
Working conditions and process of AUTO mode
Under AUTO mode, standard cooling temperature T
preset
is 77
and standard heating temperature T
preset
is 68
.
a. Once energized, if T
amb
71.6
, the unit will be started under heating mode; if 71.6
< T
amb
.< 78.8
, the unit will run under fan
mode and the run indicator will be bright; and if T
amb
78.8
, the unit will be started under cooling mode.
ºF
ºF
ºF
ºF
ºF
ºF
ºF
ºF
ºF
ºF
ºF
º F
ºF
ºF
ºF
ºF
ºF
ºF
ºF
A T
outdoor amb.
≥ 41
̧
, T
outdoor pipe
≤28.4
̧
;
B 28.4
̧
≤T
outdoor amb.
C 23
̧
≤T
outdoor amb.
˘
28.4
̧
, T
outdoor pipe
≤17.6
̧
;
D 14
̧
≤T
outdoor amb.
˘
23
̧
, T
outdoor pipe
- T
compensation
≤
˄
T
outdoor amb
-5.4
̧
˅˗
E T
outdoor amb.
˘
14
̧
, T
outdoor pipe
-T
compensation
≤
˄
T
outdoor amb
.-5.4
̧
˅
After energization, when defrosting for the first time T
compensation
=0
̧
. If it is not the firstly time for
defrosting, the T
compensation
is determined by the T
outdoor pipe
of last time quitting defrosting.
a. Toutdoor pipe
˚
35.6
̧
, Tcompensation=0
̧
; b. Toutdoor pipe ≤35.6
̧
, Tcompensation=5.4
̧
