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3. If Tpreset-(Tindoor ambient- Tcompensatory) ≤-3.6°F, the compressor will stop and the outdoor fan will stop with a
time lag of 30s;
4. If turning off the unit when the unit is in heating mode or switching heating mode to another mode, the 4-way valve will
be powered off after the compressor stops for 2min (the compressor has already started in heating mode).
5. If Toutdoor ambient>86°F, the compressor will stop and the outdoor fan will stop with a time lag of 30s
6. When the compressor has started, if switching cooling or dry mode to heating mode, the 4-way valve will be energized
with a time lag of 2-3min.
Note: Tcompensatory is determined by indoor unit and outdoor unit. If the indoor unit controls Tcompensatory,
Tcompensatory is determined by the data sent by indoor unit to outdoor unit; if the indoor unit doesn’t control
Tcompensatory, the outdoor unit will control Tcompensatory and the default data is 5.4°F. (there is instruction in the
communication protocol to describe if the Tcompensatory is controlled by indoor unit)
2. Condition and process of defrost
(1)When Toutdoor ambient≤41°F and the compressor has run for 3h, if Toutdoor tube<0°F is continuously detected for
1min, the unit will enter defrosting; [Note: the accumulated time is cleared if one of the below condition is met: Toutdoor
ambient>41°F, the compressor starts up after switching to cooling or dry mode, when defrosting is finished; for other
situations besides above conditions, the accumulated time will not be cleared (including the unit stops when reaching the
temperature point, the unit stops for protection, switching to fan mode,etc.)]
(2) 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:
a. Toutdoor ambient>41°F, Toutdoor tube≤28.4°F;
b. 28.4°F≤Toutdoor ambient<41°F, Toutdoor tube≤21.2°F;
c. 23°F≤Toutdoor ambient<28.4°F, Toutdoor tube≤17.6°F;
d. 14°F≤Toutdoor ambient<23°F, Toutdoor tube- Tcompensatory≤(Toutdoor ambient-5.4°F)
e. Toutdoor ambient<14°F, Toutdoor tube- Tcompensatory≤(Toutdoor ambient-5.4°F)
After energization, for the first defrosting, Tcompensation=0°F; if it is not the first time of defrosting, Tcompensation will
be determined by
Toutdoor pipe when quitting defrosting last time;
a. Toutdoor pipe >35.6°F, Tcompensation=0°F;
b. Toutdoor pipe ≤35.6°F, Tcompensation=5.4°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 ≥50°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.
3. Protection
◆ Cold air prevention
The unit is started under heating mode (the compressor is ON):
1. In the case of T indoor amb. <75.2°F: if T tube≤104°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°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 nonoperation, if T tube>107.6°F, the fan will run at present speed.
2. In the case of T indoor amb. ≥75.2°F: if T tube≤107.6°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°F, the indoor fan
will be converted to preset speed.
Note: T indoor amb. indicated in1 and 2 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.
Product Introduction
Basic Functions - 9K & 12K 230 volt
