Gree HOME GMV Инструкция по эксплуатации онлайн [194/367] 48267

Gree HOME GMV Инструкция по эксплуатации онлайн [194/367] 48267
Dc Inverter VRF plus Water Heater Solution Service Manual INSTALLATION
190
When wrapping the thermal insulation tape, each circle shall suppress half of the previous
circle. To avoid reducing the thermal isolation effect, do not wrap the tapes too tight.
After completing the protection work and wrapping the pipes, use the sealing materials to
block the holes in the wall.
10.11 Vacuum Pumping
1Purposes of vacuum pumping
Discharge air and nitrogen in the piping to obtain vacuum state.
Vacuum is dry, capable to remove moisture in the system.
Under atmospheric pressure, the boiling point of water is 100 . But with increased vacuum
degree created by vacuum pump, the boiling point rapidly reduces. If boiling point reduces below
ambient temperature, moisture in piping will be evaporated. If vacuum is 0Kgf/cm
2
of absolute
pressure (gauge pressure is -1Kgf/cm
2
), moisture in the system can be evaporated totally
2Selection of vacuum pump
Proper vacuum pumps must be selected before vacuum pumping. Insufficient capacity of selected
vacuum pump would lead to overtime of vacuum pumping and fall short of the requirement for
vacuum degree. A proper vacuum pump can obtain vacuum degree of 0Kgf/cm
2
(gauge pressure
-1 Kgf/cm
2
) after vacuum pumping
Features of a vacuum pump shall be determined by two factors as follows:
Selection of a pump that can meet expected requirement (i.e. gauge pressure of -0.1MPa
shall be obtained)
Exhaust flow is high (over 40L/min).
The following vacuum pumps are recommended.
Model
Maximum vacuum air
displacement
Use
Air discharge Vacuum drying
Lubricant shaft
pump
100L/min Suitable Suitable
Non-lubricant shaft
pump
50L/min Suitable Suitable
Comparison table of different pressure units is as follows:
Unit
Standard air
pressure
Vacuum degree
Relative pressure kg/cm
2
0 -1.033
Absolute pressure kg/cm
2
1.033 0
mm Hg mmHg 0 -755
3Vacuum pumping
The steps are as follows:
a. Expel the nitrogen after leakage detection;
Connect the pressure gauge to Freon nozzle on outdoor liquid valve and gas valve, and connect a
vacuum pump. Then, establish vacuum simultaneously from high pressure side and low pressure
side.
Start the vacuum pump and turn on “L
O
” and “H
I
” knobs
Vacuum pump
Connector on liquid side
Connector on gas side
Pressure gauge connector valve

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