Sinclair MV-E14BI - Page 15

13
Service Manual
2.4 Communication malfunction
Detection of the quantity
of installed indoor units:
After 3min of energizing, if the outdoor unit does not receive the communication data
of certain indoor unit, the outdoor unit wi
ll
j
udge that indoor unit is not installed and will treat it as it is not installed. If the outdoor unit receives the communication data of
that indoor unit later, the outdoor unit
will treat that unit as it is installed.
2.5 Overcurrent Protection
a. Overcurrent protection of complete unit; b. phase
wire current protection; c. compressor phase current protection
2.6 Compressor high-pressure protection
2.6.1
When the high-pressure switch is detected cut off for 3s continuously, the compressor will enter high-pressure protection
as
it stops when reaching set temperature. Meanwhile, the outdoor unit will send the signal of “high-pressure protection” to th
e
indoor units;
2.6.2
After the appearance of high-pressure protection, when the high-pressure switch is detected closed for 6s continuously
,
the compressor can resume running only after cutting off the po
wer and then putting through the power.
2.7 Compressor overload protection
If the compressor overload switch is detected having movement, the indoor unit
will display the corresponding malfunction as it
stops
when the indoor temperature reaching set temperature. When the compressor stops for more than 3min and
the
compressor overload
switch is reset, the unit will resume operation status automatically. If the protection appears for more th
an
6 times (if the running time of the compressor is longer than 30min, the protection times record
will be cleared), the unit can
not
resume
operation status automatically, but can resume running only after cutting off the power and then putting through
the
po
wer.
2.8 Compressor Phase-lacking Protection
When
the compressor starts, if one of the three phases is detected open, the compressor will enter phase-lacking
protection.
The
malfunction will be cleared after 1min, the unit will restart and then detect if there is still has phase-lacking protectio
n. If the
phase-lacking
protection is detected for 6 times continuously, the compressor will not restart but can resume running only afte
r
cutting
off the power and then putting through the power. If the running time of the compressor is longer than 7min,
the
protection times record
will be cleared.
2.9 IPM Protection
2.9.1
When the IPM module protection is detected, the unit will stop as the indoor temperature reaching set temperature, PFC is
closed,
display IPM protection malfunction. After the compressor stops for 3min, the unit will resume operation status
automatically;
if the IPM protection is detected for more than 6 times continuously (If the running time of the compressor is
longer
than 7min, the protection times record will be cleared), the system will stop and send the signal of module protection t
o
indoor unit.
The unit can not resume operation status automatically, but can resume running only after cutting off the power an
d
then putting through the po
wer.
2.9.2 IPM module overheating protection
2.9.2.1 When
T
IPM
η85ć, prohibit to raise frequency;
2.9.2.2
When T
IPM
≥90ć, the operation frequency of compressor lows down by 15% every 90s according to the
present
capacity
requirement of the complete unit. It will keep 90s after lowing down the frequency. After lowing down the frequency, i
f
T
IPM
≥90ć, the unit will circulate the above movement until reaching the minimum frequency; if 85ćζT
IPM
ζ90ć, the unit will
run at this frequency;
when T
IPM
≤85ć, the unit will run at the frequency according to the capacity requirement;
2.9.2.3
When T
IPM
≥95ć, the compressor stops. After the compressor stops for 3min, if T
IPM
ζ85ć, the compressor and
the
outdoor fan
will resume operation.