Si39-406
Installation
General Information
37
3. Degree of vacuum measurement
An extremely accurate vacuum gauge is required to test degree of vacuum. You cannot accurately
measure degree of vacuum with the compound gauge on the gauge manifold. A Pirani vacuum
gauge is required to measure degree of vacuum accurately. Because Pirani gauges are very
sensitive and require extreme care when using, they are not very suitable for use in the field. You
should therefore use the Pirani gauge to calibrate the attached vacuum gauge on the gauge
manifold and the degree of vacuum of the vacuum pump.
4. Calibration method
1. Connect a Pirani vacuum gauge and the gauge manifold vacuum gauge (0 - 760 mmHg) to the
vacuum pump at the same time, and run the pump for about 3 minutes.
2. Make sure the reading of the Pirani vacuum gauge is 5 Torr (667 Pa) or less. The reading of
conventional vacuum pumps lowers to about 0.2 Torr.
If the reading is not 5 Torr or less, check the vacuum pump oil. (Oil is low in many cases.)
3. Check the attached gauge on the gauge manifold. Adjust the gauge if the reading is not exactly
correct.
4. Adjust the gauge manifold valve so that the Pirani vacuum gauge reads 5 Torr.
5. Mark the position indicated by the gauge manifold gauge with an oil based ink pen.
6. Use the mark of the gauge manifold as a target when vacuuming in the field.
(Reference) Types of vacuum pump with respective maximum degree of vacuum
Type
Maximum Degree of Vacuum
Use
Expulsion Capacity Vacuum Drying
Air Expulsion
Oil Rotary
(Oil Using)
–14.66psi (0.02 mmHg)
100 l/min
Suitable
Suitable
Oilless Rotary
(No Need of Oil)
–14.5psi (10 mmHg)
50 l/min
Unsuitable
Suitable
–14.66psi (0.02 mmHg)
40 l/min
Suitable
Suitable
←
Many handy
pumps fall into this
category
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Страница 1: ...Design Installation Testing Instruction R410A Heat Recovery 60Hz REYQ96MTJU Si39 406...
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Страница 68: ...Installation Si39 406 62 General Information Caution Caution label 3P124617 4P124614...
Страница 114: ...Appendix Si39 406 108 General Information 3P135887 1...
Страница 124: ...Appendix Si39 406 118 General Information 7 8 Piping System Diagrams 7 8 1 Outdoor Unit REYQ96MTJU 4D045329...
Страница 126: ...Appendix Si39 406 120 General Information 7 8 3 BS Unit BSVQ36MVJ BSVQ60MVJ 4D045338...
Страница 127: ...Si39 406 Appendix General Information 121 7 9 Wiring Diagrams 7 9 1 Outdoor Unit REYQ96MTJU 3D044892A...
Страница 128: ...Appendix Si39 406 122 General Information 7 9 2 Field Wiring REYQ96MTJU 3D042647A...
Страница 156: ...Refrigerant Piping Si39 406 150 Installation Manual REYQ96MTJU...
Страница 158: ...Refrigerant Piping Si39 406 152 Installation Manual REYQ96MTJU...
Страница 230: ...Precautions for New Refrigerant R410A Si39 406 224 Precautions for New Refrigerant R410...
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