14
NOTE1 • When the indoor coil thermistor reads above 18°C, indoor fan operates at VLo for 30 seconds.
• When the indoor coil thermistor reads 18°C or less, the indoor fan stops.
NOTE2 • Refer to the Service Manual OB185 REVISED EDITION C when MSH-18NV-
is connected with
MXZ-32NV-
or MXZ-32NV-
as multi system units.
• Refer to the Service Manual OB227 REVISED EDITION-B when MSH-18NV-
is connected with
MXZ-32RV-
as multi system units.
E1
E4
E2
E1
E4
(3) Defrosting time chart
Defrost thermistor RT61
3
:
or more
-3
:
or less
Outdoor 52C
contactor(Compressor)
X62
(Reversing valve coil)
SR61
Outdoor fan
Defrost
counter
Indoor fan
Indoor vane
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Horizontal
Set position
Max 10 min.
30 sec.
15 sec.
30 sec.
5~15 sec.
NOTE1
3. Defrosting
Defrosting of outdoor heat exchanger is controlled by DEICER P.C. board, with detection by the defrost thermistor RT61.
(1) Starting conditions of defrost
When all conditions of a) ~ c) are satisfied, the defrosting operation starts.
a) Under the heat operation, the compressor cumulative operation time exceeds 40 minutes without the defrosting
operation working.
b) The defrost thermistor RT61 reads - 3°C or less.
c) After releasing the high pressure protection 4 minutes and 15 seconds have elapsed.
(2) Releasing conditions of defrost
When the condition d) or e) is satisfied, the defrosting operation stops.
d) The defrost thermistor RT61 reads 3°C or more.
e) The defrosting time exceeds 10 minutes.
VLo
