York Floor Ceiling R-410A 50Hz Service Manual download pdf (Page 265)

Installation

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3) Vacuum dry procedure

There are two methods of vacuum dry due to different construction environment:

common vacuum dry, special vacuum dry.

Common vacuum dry procedure

 Vacuum dry (for the first time)---connect the all-purpose detector to the inlet of liquid

pipe and gas pipe, and run the vacuum pump more than two hours (the vacuum pump should be

below -755mmHg)

 If the pump can’t achieve below -755mmHg after pumping 2 hours, moisture or leakage

point will still exist in the pipe. At this time, it should be pumped 1 hour more.

 If the pump can’t achieve -755mmHg after pumping 3 hours, please check if there’s some

leakage points.

 Vacuum placement test: place 1 hour when it achieves -755mmHg, pass if the vacuum

watch shows no rising. If it rises, it shows there’s moisture or leakage point.

 Vacuuming from liquid pipe and gas pipe at the same time.

 Sketch map of common vacuum dry procedure.

Special vacuum dry procedure

 This vacuum dry method is used in the following conditions:

- There’s moisture when flushing the refrigerant pipe.

- Rainwater may enter into the pipe.

 Vacuum dry for the first time 2h pumping

 Vacuum destroy for the second time Fill nitrogen to 0.5Kgf/cm2 because nitrogen is for

drying gas, it has vacuum drying effect during vacuum destroy. But if the moisture is too much,

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TECHNICAL SERVICE MANUAL 1
Part I General Information 5
Contents 18
Part 3 Outdoor 27
YDS-100WC15/35 50
YDS-140WC15/35 50
A 624 1030 52
B 55 52
C 1030 52
Part 4.1 Four-way cassette 72
Piping: 8m (horizontal) 79
Notes: 80
YDS-28-80KC 230 170 89
YDS-90-140KC 300 190 89
Indoor unit H(mm) 90
YDS-28-80KC ≥260 90
YDS-90-140KC ≥300 90
YDS-22-56GC ≥280 90
- 100 101
- 101 102
Part 4.2 Wall Mounted 103
- 103 104
- 104 105
- 105 106
- 106 107
- 107 108
3. Capacity table 109
- 109 110
- 110 111
- 111 112
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YDS-45-56EC/HC 119
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Part 4.4 Medium ESP Duct 152
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Part 5 Installation 240
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Gr ounded wi r e 281
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Part 6 Control System 289
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Form No. 035M00457-000 385
2009 Johnson Controls, Inc 385

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York Floor Ceiling R-410A 50Hz Service Manual Page 265

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