20
Operation Modes and Functions
FAN Mode
1 Outdoor fan and compressor stop
2 Temperature setting function is disabled, and no setting
temperature is displayed.
3 Indoor fan can be set to high/med/low/auto
4 The louver operates the same in the COOLING mode.
5 Auto fan
Fig. 18 – Auto Fan
COOLING Mode
Compressor Running Rules:
S
When T1
*
Ts < 28.4
_
F(
*
2
_
C), the compressor stops.
S
When T1
*
TS > 31.1
_
F(
*
0.5
_
C), the compressor
activates.
S
When the AC runs in the mute mode, the compressor
runs with low frequency.
S
When the current is more than setting value, the current
protection function activates, and the compressor stops.
Outdoor Fan Running Rules:
The outdoor unit runs at a different fan speed according to T4. For
different outdoor units, the fan speeds differ.
Fig. 19 – Outdoor Fan Running Rules
The auto fan adheres to the following rules.
Fig. 20 – Auto Fan
Fig. 21 – Compressor Temperature Protection
When the condenser temperature temperature is higher than the
setting value, the compressor stops.
Compressor Running Rules
When T1−Ts>−
Δ
T, the compressor stops, when
T1−T
S
<
Δ
T−1.5
，
the compressor will be on.
Δ
T is the
programmed parameter of temperature compensation. When the
AC run in mute mode, the compressor runs with low frequency.
When the current is more than setting value, the current protection
function is activated and the compressor stops.
Outdoor Fan Running Rules
The outdoor unit runs at different fan speed according to T4. For
different outdoor units, the fan speeds are different.
Fig. 22 – Outdoor Fan Running Rules
Summary of Contents for 38MHRB series
Page 7: ...7 DIMENSIONS OUTDOOR CONT Unit inch mm Fig 3 Size 24K...
Page 11: ...11 WIRING DIAGRAMS COOLING ONLY Fig 7 Wiring Diagram Size Cooling Only Size 12K 115V...
Page 12: ...12 WIRING DIAGRAMS COOLING ONLY CONTINUED Fig 8 Wiring Diagram Cooling Only Size 12K 230V...
Page 13: ...13 WIRING DIAGRAMS COOLING ONLY CONTINUED Fig 9 Wiring Diagram Cooling Only Sizes 18 24K...
Page 14: ...14 WIRING DIAGRAMS HEAT PUMP Fig 10 Wiring Diagram Heat Pump Size 12K 115V...
Page 15: ...15 WIRING DIAGRAMS HEAT PUMP CONTINUED Fig 11 Wiring Diagram Heat Pump Sizes 09 12 18 230V...
Page 16: ...16 WIRING DIAGRAMS HEAT PUMP CONTINUED Fig 12 Wiring Diagram Heat Pump Size 24 230V...
Page 37: ...37 DIAGNOSIS AND SOLUTION CONT Fig 36 P U Fig 37 P V...
Page 38: ...38 DIAGNOSIS AND SOLUTION CONT Fig 38 P W Fig 39 N U...
Page 39: ...39 DIAGNOSIS AND SOLUTION CONT Fig 40 N V Fig 41 N W...
