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(2) Temperature conditions of judging to start defrosting
Outdoor ambient temperature Outdoor pipe temperature
15ć ≤ T
outdoor ambient temperature
T
outdoor pipe temperature
≤ -10ć
5ć ≤ T
outdoor ambient temperature
<15ć T
outdoor pipe temperature
≤ [T
temperature 1 of starting defrosting
]
0ć≤ T
outdoor ambient temperature
< 5ć T
outdoor pipe temperature
≤ [T
temperature 2 of starting defrosting
]
-5ć≤ T
outdoor ambient temperature
< 0ć T
outdoor pipe temperature
≤ [T
temperature 3 of starting defrosting
]
-10ć≤ T
outdoor ambient temperature
< -5ć T
outdoor pipe temperature
≤ (T
outdoor ambient temperature ! [
T
temperature difference 1 of starting
defrosting
]
-15ć ≤ T
outdoor ambient temperature
< -10ć T
outdoor pipe temperature
≤ (T
outdoor ambient temperature ! [
T
temperature difference 2 of starting
defrosting
]
-20ć ≤ T
outdoor ambient temperature
< -15ć T
outdoor pipe temperature
≤ (T
outdoor ambient temperature ! [
T
temperature difference 3 of starting
defrosting
]
-25ć ≤ T
outdoor ambient temperature
< -20ć T
outdoor pipe temperature
≤ (T
outdoor ambient temperature ! [
T
temperature difference 4 of starting
defrosting
]
T
outdoor ambient temperature
< -25ć T
outdoor pipe temperature
≤ (T
outdoor ambient temperature ! [
T
temperature difference 5 of starting
defrosting
]
(3) Conditions of finishing defrosting
The defrosting operation can exit when any condition below is satisfied:
(1) T
outdoor pipe temperature
≥ (T
outdoor ambient temperature
! [T
temperature 1 of finishing defrosting
];
(2) T
outdoor ambient temperature
< -5ć, and T
outdoor pipe temperature
≥[T
temperature 2 of finishing defrosting
], the time lasts for over
80s;
(3) The continuous running time of defrosting reaches [t
max. defrosting time
].
4. Control Logic
(1) Compressor Control
Notes:
See "Frequency control of inverter compressor# for controls of compressor frequency;
Start the compressor after starting cooling, heating, dehumidifying operations, and the outer fans start for 5s;
When the machine is shutdown, in safety stops and when switching to air-supplying mode, the compressor will
stop immediately.
In all modes: once the compressor starts up, it will not be allowed to stop until having run for the [t
min. compressor
running time
] (Note: including cases of shutdown when reaching the temperature point; except the cases requiring
stopping the compressor such as fault protection, remote shutdown, mode switching etc.);
In all modes: once the compressor stops, it will be allowed be restart after 3-minute delay (Note: The inner units
have a function of power memory, the machine can restart after remote shutdown and powering up again without
delay).
1. Cooling mode
Start the machine to enter into cooling operation for cooling, the compressor is switched on.
2. Dehumidifying mode
Same as the cooling mode.
3. Air-supplying mode
The compressor is switched off.
4. Heating mode
(1) Start the machine to enter into heating operation for heating, the compressor is switched on.
(2) Defrosting:
a. Defrosting starts: the compressor is shut down, and restarts it after 55-second delay.
b. Defrosting ends: the compressor stops, then starts it after 55-second delay.
(2) Outer Fans Control
Notes:
Only the outer fans run at least 80s in each air flow speed can the air flow be switched;
After the outer fans run compulsively in high speed for 80s when the machine starts up, control the air flow
according to the logic.
after remote shutdown, safety stops, and when the machine stops after reaching the temperature point, as well
as after the compressor stops, extend 1 minute, the outer fans will stop (During the period in the 1 minute, the air
flow of outer fans can be changed according to the outdoor ambient temperature changes);
When running with force, the outdoor fans shall run in the highest air flow.
1. Outer fans control logic in cooling/dehumidifying mode:
(1) If T
outdoor ambient temperature
≥ [T
inlet temperature in high cooling air flow
], the outer fans will run in high air flow speed;
(2) If T
outdoor ambient temperature
≤ [T
inlet temperature in low cooling air flow
], the outer fans will run in low air flow speed;
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