MCAC-RTSM-2012-07 M-thermal Technical Manual (part 4)
H. "P2":
Low pressure protection
Outdoor Unit
Display
P2
Error
Explanation
The protection device circuit checks continuity in low pressure switch
Supposed
Causes
1. Faulty low pressure switch
2. Refrigerant is not enough.
3. Refrigerant does not loop smoothly.
4. Efficiency of indoor heat exchange is low.
5. Control board is not defective.
Troubleshooting
P2: Low pressure protection (R22 refrigerant system protects
at 0.03Mpa, recovers at 0.1MPa; R410 refrigerant system
protects at 0.05MPa, recovers at 0.15MPa, or protects at
0.14MPa, recovers at 0.3MPa).
Refrigerant is not enough or the
system leaks refrigerant.
System's gas side is blocked. Phenomenon
may be discharge temperature is high, low
pressure is low, current is small. These are
caused by closed EXV valve, closed stop valve
or blocked filter.
Heat exchanger of IDU is inefficient, which
may be caused by the dirty exchanger or
filter, block of air flow, the fan not running
or running too slowly.
Chip is defective or incorrectly installed. Or
the low pressure sensor is disconnected.
Main control board is defective.
Reinstall the chip or replace it
with a fine one.
Replace the main
control board.
Check the system
over and eliminate
the obstacles.
Clear away the
block.
Add refrigerant or
fix up the system.
Clean the filter. If the
system is block by ice, the
system should also be clean.
Содержание CSD80GN1
Страница 27: ...1 4 Dimensions of the outdoor unit 1 5 Installation space 1 Single unit installation...
Страница 28: ...2 Parallel connect the two units or above 3 Parallel connect the front with rear sides...
Страница 50: ......
Страница 56: ...The connection is described in the following figure The wiring terminal diagram as following figure...
Страница 59: ......
Страница 60: ......
Страница 70: ...M thermal technical manual part 3 3 4 Field setting table...