Gree GWH12TB-D3DNA1A - Page 34

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Condition and process of defrost
(1). T outdoor ambient＞41
°F
, T outdoor tube≤28.4
°F
;
(2) 28.4
°F
≤T outdoor ambient＜41
°F
, T outdoor tube≤21.2
°F
;
(3) 23
°F
≤T outdoor ambient＜28.4
°F
, T outdoor tube≤17.6
°F
;
Protection
Cold air prevention
The unit is started under heating mode (the compressor is ON):
In the case of T indoor amb. <75.2
o
F: if T tube≤104
o
F 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
o
F, 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>107.6
o
F, the fan will run at present speed.
In the case of T indoor amb. ≥75.2
o
F: if T tube≤107.6
o
F, 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>107.6
o
F, 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start the compressor is performed according to the program, or after the unit is withdrawn from defrost, the indoor ambient temperature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
When total current I
total
≤6A, increase frequency is allowed; when total current I
total
≥7A, increasing frequency is prohibited; when total
current I
total
≥8A, the unit operates by decreasing frequency. When total current I
total
≥9A, the compressor stops operation, and indoor
fan will stop operation after 30s.
(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 60.8 - 86
o
F.
(5) AUTO Mode
Working conditions and process of AUTO mode
a. When T ambient ≥78.8
o
F, the unit will operate in Cool mode. The set temperature is 77
o
F.
b. When T ambient ≤71.6
o
F, the heat pump unit will operate in Heat mode., set temperature be 20
o
C; the cooling only unit will operate in
Fan mode, set temperature be 77
o
F.
c. When 73.4
o
F≤T ambient ≤77
o
d. Under auto mode, if it's cooling mode, operation frequency is same as that under cooling mode; if it's heating mode, operation
frequency is same as that under heating mode.
Protection
a. In cooling operation, protection is the same as that under the cooling mode;
b. In heating operation, protection is the same as that under the heating mode;
c. When ambient temperature changes, operation mode will be converted preferentially. Once started, the compressor will
remain unchanged for at least 6 minutes.
(1)When Toutdoor amb.İ41°F and compressor has accumulated operated for 3 hours, if Toutdoor pipe ˘-32°F, the unit will enter
defrosting mode; (Note: when meeting any condition below, the time will be cleared: Toutdoor amb.˚41
°F; compressor has be
started up after changing to cooling/drying mode and defrosting has finished; except the conditions above (including stop of the unit
when reaching temperature point, stop of the unit for protection, changing to fan mode,etc), the time will not be cleared.
(2) When heating has operated for continuous 45 minutes, or for accumulated 90 minutes, the unit will enter defrosting mode in 3
minutes after meeting any condition below;
(4)14
°FİToutdoor amb. ˘23°Fˈ Toutdoor pipe-Tcompensation İ˄Toutdoor amb.-37.4°F˅
(5)Toutdoor amb.˘14
°F, Toutdoor pipe –Tcompensation İ˄Toutdoor amb.-37.4°F˅
After energization, for the first defrosting, Tcompensation=32
°F; if it is not the first time of defrosting, Tcompensation will be
determine by Toutdoor pipe when quitting defrosting last time; Toutdoor pipe ˚35.6
°F, Tcompensation=32°F; Toutdoor pipe İ35.6
°F, Tcompensation=37.4°F.
(3) During defrosting, if operation time for compressor doesn’t reach 3min, the defrosting will not be entered in the subsequent 2
hours. At that time, compressor stops operation and in 30s later, the outdoor fan will stop operation; in another 30s, 4-way valve will
stop operation; in 30s later, compressor will increase its frequency for defrosting. When defrosting lasts for 450s, or Toutdoor pipe
ı50
°F, compressor will decrease its frequency. In 30s later, compressor will stop operation; in another 30s, 4-way valve will be
started up. In 60s later, compressor and outdoor fan will operate. Frequency for defrosting is 85Hz.