Tightening Flare Nuts; Brazing Work; Refrigerant Charging Quantity - Hitachi RPI-10FSNE Installation And Operation Manual
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REFRIGERANT PIPING &
REFRIGERANT CHARGE
11.4.4. TIGHTENING FLARE NUTS
The required tightening torque is as follows:
Pipie size
Tightening Torque (N.m)
Ø 6.35 mm
Ø 9.53 mm
Ø 15.88 mm
Ø 19.05 mm
11.4.5. BRAZING WORK
ATTENTION:
-
Use nitrogen gas for blowing during pipe brazing. If oxygen, acetylene or fluorocarbon gas is used, it will cause an explosion or
poisonous gas.
-
A lot of oxidation film will occur inside of tubes if no nitrogen gas blowing is performed during brazing work. This film will be
flecked off after operation and will circulate in the cycle, resulting in clogged expansion valves, etc. This will cause bad influence
to the compressor.
-
Use a reducer valve when nitrogen gas blowing is performed during brazing. The gas pressure should be maintained within
0.03 to 0.05 MPa. If a excessively high pressure is applied to a pipe, it will cause an explosion.
11.4.6. REFRIGERANT CHARGE
CAUTION:
-
Do not charge OXYGEN, ACETYLENE, or other flammable and poisonous gases into the refrigerant because an explosion can
occur. It is recommended that oxygen free nitrogen be charged for these types of tests cycle when performing a leakage test or
an airtight test. These types of gases are extremely dangerous,
-
Insulate the unions and flare-nuts at the piping connection part completely.
-
Insulate the liquid piping completely to avoid a decrease of performance; if not, it will cause sweating on the surface of the pipe.
-
Charge refrigerant correctly. Overcharging or insufficient charging could cause a compressor failure.
-
Check for refrigerant leakage in detail. If a large refrigerant leakage occurred, it would cause difficulty with breathing or harmful
gases would occur if a fire were being used in the room.
11.5. REFRIGERANT CHARGING QUANTITY
Refrigerant has been charged into this unit for 10 m of length pipe. It is required that additional refrigerant be charged according
the piping length if it is higher than 10 m
1. Determine an additional refrigerant quantity according to the following procedure, and charge it into the system.
2. Record the additional refrigerant quantity to facilitate service activities thereafter.
CAUTION:
-
When charging refrigerant accurately measure refrigerant to be charged.
Overcharging or undercharging of refrigerant can cause compressor trouble
Outdoor Unit Factory Charge
■
Unit
RASC-5
RASC-10
20
40
80
100
W
:Ref. charge Kg
W (10m) Kg
0
4.80
8.50
0.70
1.20
PMGB0126A rev.2 - 11/2006
20
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