15
ENGLISH
EN
Air and moisture in the refrigerant system have undesirable effects as indicated below:
• Pressure in the system rises.
• Operating current rises.
• Cooling or heating efficiency drops.
• Moisture in the refrigerant circuit may freeze and block capillary tubing.
• Water may lead to corrosion of parts in the refrigeration system.
Therefore, the indoor unit and tubing between the indoor and outdoor unit must be leak tested and evacuated to
remove any noncondensables and moisture from the system.
Air purging with vacuum pump
■
Preparation
Check that each tube (both liquid and gas side tubes) between the indoor and outdoor units have been properly
connected and all wiring for the test run has been completed. Remove the service valve caps from both the gas and
the liquid side on the outdoor unit. Note that both the liquid and the gas side service valves on the outdoor unit are
kept closed at this stage.
■
Pipe length and refrigerant amount:
Connective
pipe length
Air purging
method
Less than 5m
Use vacuum pump.
Additional amount of refrigerant to be charged
Liquid side: ø6.35 (Pipe length-5) x30g
5~10m
Use vacuum pump.
• When relocate the unit to another place, perform evacuation using vacuum pump.
• Make sure the refrigerant added into the air conditioner is liquid form in any case.
■
Defrosting operation (Available for heating only)
1.
Condition to start defrosting: Units will switch to defrosting
mode when either of the following conditions is met.
a. Unit has been running under T3<0
o
C for 40 minutes
and T3<-3
o
C for 3 minutes.
b. Unit has been running at high temperature protection
mode* for 90 minute. (*High temperature protection
mode: when coil temperature of indoor unit reaches
55°C, outdoor unit will turn off external unit fan but
still keep compressor running).
2.
Condition to stop defrosting: Units will switch back to
heating mode when either of the following conditions is
met.
a. Unit has been running at defrosting mode for 10
minutes.
b. T3>20
o
C
Remark:
T3 is coil temperature of outdoor units.
0
-1
-2
-3
-4
-5
1
2
0
5
10 15 20 25 30 35 40 45 50
T3 (°C)
3 min
40 min
Time
Elapsed
(min)
Starting Defrosting Mode under condition a.
Model
7,000-9,000Btu/h
12,000Btu/h
Power supply
220-240V~50Hz
Input Rated Amp
(Switch/Fuse)
10
A
10
A
Power Cord Size
f
2.
5mm
2
f
2.
5mm
2
NOTE:
The supply voltage can not be less than the rate voltage of the air conditioner.
AIR PURGING
■
Electrical Work
18,000Btu/h
16
A
f
2.5mm
2
220-240V~50Hz
220-240V~50Hz
Heating mode Defrosting mode
J190
2/03/2005, 4:56 AM
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