York Floor Ceiling R-410A 50Hz Service Manual download pdf (Page 264)

Installation

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4.6.7 Vacuum dry for refrigerant pipe

1) Vacuum Dry: use vacuum pump to change the moisture (liquid) into steam (gas) in the

pipe and discharge it out of the pipe to make the pipe dry. Under one atmospheric pressure, the

boiling point of water (steam temperature) is 100℃. Use vacuum pump to make the pressure in

the pipe near vacuum state, the boiling point of water falls relatively. When it falls under outdoor

temperature, the moisture in the pipe will be vaporized.

2) Selection of vacuum pump

♦ Select the vacuum pump. (Normally the anticipative demand achieves -755mmHg)

♦ Big discharge volume (over 40l/min). Check the vacuum calculator before operation to

make sure its measure range achieve below -755mmHg.

Boiling point of water (℃)

Gas pressure (mmHg) Vacuum degree (mmHg)

40 55 -705

30 36 -724

26.7 25 -735

24.4 23 -737

22.2 20 -740

20.6 18 -742

17.8 15 -745

15.0 13 -747

11.7 10 -750

7.2 8 -752

0 5 -755

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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
- 112 113
- 114 115
- 115 116
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- 117 118
YDS-45-56EC/HC 119
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- 120 121
- 121 122
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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
- 289 290
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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 264

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