60
E. Refrigerant Piping Installation
•
Please make flare after inserting flare nut (located at joint portion of
tube assembly) onto the copper pipe. (in case of using long piping)
• Do not use pipe wrench to open refrigerant piping. Flare nut may be
broken and cause leakage. Use proper spanner or ring wrench.
• Connect the piping:
- Align the center of piping and sufficiently tighten the flare nut with
hands.
- Be sure to use two spanners to tighten the connection. Further
tighten the flare nut with torque wrench in specified torque as stated
in table.
Note:
• Do not over tighten, over tightening may cause gas leakage.
• Do not pull and push refrigerant piping excessively, pipe deformation
may cause refrigerant leakage.
Cutting and flaring the piping
• Please cut the pipe with pipe cutter and make sure there is no burrs remained, or gas leakage may be caused.
• Remove the burrs with reamer, and hold the pipe with end in a downward direction to avoid the metal powder
entering the piping inside.
•
Please make flare after inserting the flare nut onto the copper pipes.
F. Leakage test, Evacuation, Check valve operation, Additional refrigerant charging
• See it in the outdoor installation manual.
G. Charging the Water
Water quality requirement
It is necessary to analyse the quality of water by checking pH, electrical conductivity, ammonia ion content, sulphur
content, and others. The following is the recommended standard water quality.
Contents
Unit
Value
Standard Quality pH(25°C)
/
7.5-9
Electrical conductivity {2}
μS/cm
10-500
Alcalinity HCO
3
-
mg/l
70-200
Sulphate SO
4
2-
mg/l
<70
Alcalinity /Sulphate HCO
3
-
/ SO
4
2-
mg/l
>1.5
Ammonium NH
4
+
mg/l
<2
Free chlorine Cl
2
mg/l
<1
Hydrogen sulfide H
2
S
mg/l
<0.05
Free carbon dioxide(aggressive) CO
2
mg/l
<5
Nitrate NO
3
-
mg/l
<100
Iron Fe
mg/l
<0.2
Aluminium Al
mg/l
<0.2
Manganese Mn
mg/l
<0.1
Chloride content Cl-
mg/l
≤50
Total Hardness CaCO
3
(°dH)
4.5-8.5
Ammonia NH
3
mg/l
<0.5
CAUTION
If the Chloride content ( Cl- ) in the circulating water of the system exceeds the required limits, please add zinc
rod to the system to remove the excessive chloride.
Always use a backup wrench when
tightening and loosening flare nuts. Tubing
will twist if not properly supported.
The flare nut or the flare fitting will be
damaged if the tubing is not properly
aligned with the flare fitting when starting
the flare nut. Do not use tools to start the
flare nut, but use hands only to begin
threading the nut.
backup wrench
Connector
Nut
torque wrench
