Ideal Air AH36LB-D3DNA3D, Service Manual

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21
Technical Information
Service Manual
6.2 Brief Description of Modes and Functions
1. Temperature Parameters
Indoor preset temperature (T
preset
)
Indoor ambient temperature (T
amb
.)
2. Basic Functions
Once energized, in no case should the compressor be restarted within less than 3 minutes. In the situation that memory function
is available, for the first energization, if the compressor is at stop before de-energization, the compressor will be started without
a 3-minute lag; if the compressor is in operation before de-energization, the compressor will be started with a 3-minute lag; and
once started, the compressor will not be stopped within 6 minutes regardless of changes in room temperature;
(1) Cooling Mode
Working conditions and process of cooling
When T
amb
T
preset
, the unit will enter cooling operation, in which case the indoor fan, the outdoor fan and the compressor will
work and the indoor fan will run at preset speed.
When T
amb
T
preset
-3.6 , the compressor will stop, the outdoor fan will stop with a time lag of 60s, and the indoor fan will run
at preset speed.
When T
preset
-3.6 < T
amb.
< T
preset
+1.8 , the unit will remain at its previous state.
Under this mode, the four-way valve will be de-energized and temperature can be set within a range from 61 to 86
If the compressor is shut down for some reason, the indoor fan and the swing device will operate at original state.
Start cooling
Stop cooling
Compressor
Original working state
Run
Stop
Outdoor fan
Indoor fan
T
preset
T
preset
+3.6
T
amb.
Preset fan speed
6 minutes
6 minutes
3 minutes
Protection
Antifreeze protection
Under cooling and dehumidifying mode, 6 minutes after the compressor is started:
If T
evap
35.6 , the compressor will operate at reduced frequency.
If T
evap
30.2 is detected for durative 3 minutes, the compressor will stop, and after 60 seconds, the outdoor fan will stop;
and under cooling mode, the indoor fan and the swing motor will remain at the original state.
If T
evap.
42.8 and the compressor has remained at OFF for at least 3 minutes, the compressor will resume its original
operation state.
Total current up and frequency down protection
If 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.
(2) Dehumidifying Mode
Working conditions and process of dehumidifying
If T
amb
>T
preset
+1.8
ºF
, the unit will enter cooling and dehumidifying mode, in which case the compressor and the outdoor fan will
operate and the indoor fan will run at low speed.
If T
preset
-3.6 T
amb
T
preset
+1.8 º F, the compressor remains at its original operation state.
If T
amb
.< T
preset
-3.6 , the compressor will stop, the outdoor fan will stop with a time lag of 60s, and the indoor fan will
operate at low speed.
ºF
ºF
ºF
ºF
ºF
ºF
ºF
ºF
ºF
ºF
˜
˜
˜
˜
˜
˜
°
°
°
①
②
①
°