Sanyo 48 series, Технические данные и руководство по обслуживанию, Страница: 226 / 275

5-9
5
No
No (alarm P26 output)
Yes
Yes
Yes
(Not operating
on high load)
(An alarm other than the alarm P26 occur)
Yes
(2) [Alarm P26]
Was everything OK
flow of alarm P29 were
checked?
Is the heat sink
connected properly to the
HIC PCB? (Loose screws and
thermal conduction
putty)
Start of defect diagnosis
Implement the same check processes for to in the diagnosis flow of alarm P29.
No
Correct the connection between the HIC PCB and heat sink.
No
Operating on high load.
Recovery methods differ in accordance with the cause.
Recharge refrigerant
Replace the thermistor
Repair the pipes, etc.
Replace the HIC PCB.
No
Implement the same check processes for to in the diagnosis flow of alarm P29.
Replace the compressor
Is the high-pressure
for the refrigerant cycle within
the range? (High load
operating?)
Does the alarm
P26 occur when the
U / V / W wires (pink/white/blue)
are disconnected from the
HIC PCB and
operation was
started?
Was everything OK
when to in the diagnosis
flow of alarm P29 were
checked?
Yes
Abonormal temperature rise in the HIC PCB is prevented by radiating the heat, with HIC being
coated evenly with thermal conduction putty and the heat sink being attached firmly to the HIC
PCB by screws. The HIC PCB cannot radiate heat properly if the screws are loose or the
thermal conduction putty is not applied correctly. Consequently, the temperature inside the
HIC PCB can rise abnormally and the alarm P26 occurs.
The HIC PCB is considered faulty if the alarm P26 occurs even if the compressor is not
operating owing to the U, V and W wires being disconnected.
Replace the HIC PCB.
Potential problems are most likely in accordance with the following sequence when it is
determined that the PCB is trouble with an alarm P26.
1. HIC PCB
2. Outdoor unit control PCB
3. Filter PCB
Replace the relevant PCBs in accordance with the above sequence.
in the diagnosis when to
1. Potential Causes
2. Temperature on the high-pressure side during normal operations.
* Verifying Overcharge
* There are cases in which the above temperatures will be lower depending on the
operation conditions.
There is no problem if the difference between the temperature on the indoor unit "E2" and
the saturated temperature of the outdoor unit's gas pipe service valve pressure is within 2
during the heating mode. Any of the following could be the reason if the former is two or
more degrees lower than latter.
Faulty operations of the outdoor unit electronic expansion valve.
Refrigerant overcharge
Has the refrigerant been overcharged?
Pipe blockage, crushed pipes, etc.
(Assumed to be on the liquid pipes during the cooling mode and the gas pipes during the
heating mode.)
C1 and C2 thermistor error on the outdoor unit (during the cooling mode.)
E1 and E2 thermistor error on the indoor unit (during the heating mode.)
Cooling: Temperature of the C2 thermistor on the outdoor unit is approximately between
45 and 55 .
Temperature of the E2 thermistor on the indoor unit is approximately between
40 and 50 .
Heating:
Related parts
Start-up failure of the compressor (will not start up)
HIC PCB (Model: [706-type, 906-type] HIC-C1155GDXH8)
Outdoor unit control PCB (Model: [706-type, 906-type] CR-C906VH8)
Filter PCB (Model: [706-type, 906-type] FIL-C906VH8)
SM830161̲Book.indb 9 SM830161̲Book.indb 9 2008/06/03 9:10:27 2008/06/03 9:10:27