INST
ALLER'S
INSTRUCTION
INST
ALLER'S
INSTRUCTION
P37 OF 44
P38 OF 44
VACUUM AND LEAKAGE CHECK
Evacuate the pipes between indoor and outdoor units, using vacuum pump and manifold/gauge set, to a
minimum of 500 microns (service valves remain front seated). Hold for 30 minutes to check if the vacuum level is
maintained. Using dry nitrogen or other leakage detection tool for leak checking. Be certain there is no pressure
in the system when repairing a leak.
Vacuum before Releasing Refrigerant from Outdoor Unit to Indoor Unit.
VACUUM REFRIGERANT PIPES
Service valve
Hexagon Allen wrench
Unit is pre-charged with refrigerant good for
25' of connection tubes. If vacuum is held for
about 30 minutes and no leak is found, first
back-seat the liquid (smaller) service valve by
Allen Wrench (hex head) slowly to release
pre-charged refrigerant from the condensing
unit into the connection pipes and indoor unit.
If no abnormal things are found, fully open
liquid (smaller) and gas (bigger) service
valves. Always replace and tighten the caps
onto service valves.
Releasing Refrigerant from Outdoor Unit to
Connected Pipes and Indoor Unit
RELEASE REFRIGERANT FROM OUTDOOR TO THE INDOOR UNIT
SYSTEM INSPECTION AND TRIAL RUNNING
CHECK SYSTEM THOROUGHLY
ADJUST REFRIGERANT
Check system thoroughly to make sure the unit is ready for trial running: check wires and pipes and air intake
and discharge and power and thermostat and others necessary components.
Adjust Refrigerant Charge by Tubing Size/Length: System charge could be adjusted per tubing size, length,
driers, and evaporator coils. DON'T overcharge or undercharge. Repair or correct any deficiencies.
If the connecting pipe is longer than 25 ft, adjust refrigerant as needed:
1/4" liquid line unit-add or deduct 0.3 OZ/ft.
3/8" liquid line unit-add or deduct 0.4 OZ/ft.
1/2" liquid line unit-add or deduct 1.2 OZ/ft.
Display Signs:
1.Once powered on, displays indoor temperature at idle status; displays set temperature during setting
temperatures in COOLING mode and HEATING mode; displays indoor temperature at other modes or
features.
2.At TIMER ON or OFF, other than TIMER sign is lit, SLEEP, COOLING, or HEATING sign will be lit, if set up
TIMER ON or OFF for.
3.When unit is in operation, LED will light up once the corresponding function is clicked on: COOLING,
DUHUMIDIFICATION, FAN and HEAT.
4.Fan speed is told by the speed of the FAN sign blade spinning. At fan stopping, FAN sign blade stops spinning;
At DEFROST during HEAT mode, FAN sign blade stops spinning.
5.Error signs
FAILURE
Indoor temperature sensor failure
Indoor coil tube temperature sensor failure
CENTER DISPLAY
E2
E3
Remarks:
1.Blink: lit for 0.5 sec., then off for 0.5 sec., then lit for 0.5 sec
2.
E4 Code:
* Outdoor ambient temperature is too low (do not to run unit during severe cold weather).
* Refrigerant at low level (users need to call service contractor to check unit).
3. More error codes are listed in the table in page 36.
TIMER/SLEEP LED
Lit
Lit
Lit
OPERATION LED
Blinks, 2 Times/8 Secs.
Blinks, 3 Times/8 Secs.
Blinks, 4 Times/8 Secs.
E4
System runs out of preferred design ranges
LED DISPLAY PANEL
SYSTEM INSPECTION AND TRIAL RUNNING
PRESSURE CHECKING
System pressure checking is one of the basics to find out the status of system performance and
diagnose any problems.
The following curves are only reference for system pressure checking. Actual pressures may vary upon many
factors such as inter-connecting pipe length, refrigerant charge / leakage level, elevation difference between
indoor unit and outdoor unit, tool calibration, reading error, and so on.
Warning:
R410A refrigerant bears higher pressures than R22. Only handled by Licensed HVAC technician.
Outdoor Dry-Bulb (F)
Outdoor Dry-Bulb (C)
Outdoor Wet-Bulb (F)
Outdoor Wet-Bulb (C)
Indoor Dry-Bulb
Indoor Wet-Bulb
Discharge-PSI/F
Suction-PSI/F
15
-9.4
13.6
-10.2
25
-3.9
23.0
-5
35
1.7
30.2
-1.0
50
10.0
42.8
6.0
55
12.8
46.9
8.3
60
15.6
51.1
10.6
67
19.4
59.5
15.3
75
23.9
66.6
19.2
82
27.8
64.9
18.3
90
32.2
71.2
21.8
95
35.0
75.0
23.9
100
37.8
79.0
26.1
105
40.6
82.9
28.3
110
43.3
86.9
30.5
115
46.1
90.7
32.6
74/21.2
84/27.1 105/35.1 115/38.5 125/42.8 130/45.5 140/48.2 146/51.2 156/54.3 166/57.5 175/61.2 180/62.5 186/63.7 189/64.5 191/64.9
60/46.2
70/53.5
85/55.2
92/55.7
98/56.1 103/56.7 110/56.9 115/57.1 120/57.5 128/57.8 135/57.9 136/58.6 137/59.1 139/59.3 140/59.5
80F (26.7C)
67F (19.4C)
Suggest to Add on Low Ambient Control, If Still
in Need of AC for Long Time In Cold Weather.
Closely Check/Watch Refrigerant Charge Level.
Reference Temperature-Pressure Table (Split Condensing Unit-R410A AC)
Product Series: YMGI Group-Mini Split Version: 01/11/2010
Reference Temperature-Pressure Table (Split Condensing Unit, R410A-Heat Pump)
Product Series: YMGI Group-Mini Split System Version: 01/11/2010
Outdoor Dry-Bulb (F)
Outdoor Dry-Bulb (C)
Outdoor Wet-Bulb (F)
Outdoor Wet-Bulb (C)
Indoor Dry-Bulb
Indoor Wet-Bulb
Discharge-PSI/F
Suction-PSI/F
0
-17.8
-0.8
-18.2
5
-15
4.1
-15.5
10
-12.2
8.8
-12.9
17
-8.3
15
-9.4
25
-3.9
22.8
-5.1
30
-1.1
27.5
-2.5
35
1.7
28.9
-1.7
40
4.4
36.3
2.4
45
7.2
41.0
5
47
8.3
43.0
6.1
55
12.8
50.4
10.2
62
16.7
56.5
13.6
70F (21.1C)
60F (15.6C)
260/84
269/90
284.5/95
290/102
296/111
304/128
304/133
330/138
345/142
354/149
400/149
440/176
246/72
255/78
270/86
278/89
285/92
290/95
310/98
318/100
330/102
340/104
380/107
425/113
YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World !
YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World !
