-
25
-
(2)
Connection of refrigerant piping
Indoor unit side
¡
Connect firmly gas and liquid side pipings
by Torque wrench.
¡
Specified torquing value:
Liquid side (ø6.35) : 15.7~19.6 N·m(1.6~2.0 kgf·m)
Gas side (ø9.52)
: 29.4~39.2 N·m(3.0~4.0 kgf·m)
Gas side (ø12.7)
: 39.2~49.0 N·m(4.0~5.0 kgf·m)
Outdoor unit side
¡
Connect firmly gas and liquid side
pipings by Torque wrench.
¡
Specified torquing value:
Liquid side (ø6.35): 15.7~19.6 N·m(1.6~2.0 kgf·m)
Gas side (ø9.52) : 29.4~39.2 N·m(3.0~4.0 kgf·m)
Gas side (ø12.7) : 39.2~49.0 N·m(4.0~5.0 kgf·m)
¡
Use one more spanner to fix the valve.
¡
Always use a Torque wrench and back up spanner to tighten the flare nut.
(3)
Air purge
(a)
Tighten all flare nuts in the pipings both indoor and outside wall so as not to cause leak.
(b)
Connect service valve, charge hose, manifold valve and vacuum pump as is illustrated below.
(c)
Open manifold valve handle Lo to its full width, and perform vacuum or evacuation.
Continue the vacuum or evacuation operation for 15 minutes or more and check to see that the vacuum gauge reads
– 0.1MPa (– 76cm Hg).
(d)
After completing vacuum operation, fully open service valve (Both gas and liquid sides) with hexagon headed wrench.
(e)
Check for possible leakage of gas in the connection parts of both indoor and outdoor.
(4)
Insulation of connecting portion
1)
Cover the connection portion of the refrigerant piping with
the pipe cover and seal them.
If neglecting to do so, moisture occurs on the piping and
water will drip out.
Additional refrigerant charge
When refrigerant piping exceeds 5m conduct additional refrigerant charge after refrigerant sweeping.
5m over 15m
Additional charge amount per meter = 30g/m
[Example]
How much amount of additional charge for 15m piping?
(15 – 5)m
×
30g/m = 300g
300g for additional charge
Vinyl tape
To cover the connecting portion with
insulation materials, cut upper portion and
then seal it with insulation materials.
Spanner
(for fixing
the piping)
Torque
wrench
Stop valve
(Two-way valve)
Service port
Charge hose
Vacuum pump
Charge hose
Handle Hi
(pressure)
Manifold
valve
Pressure
gauge
Compound
(Gauge)
Stop valve
(Three-way
valve)
Handle Lo
(pressure)
–76 cm Hg
Все каталоги и инструкции здесь:
http
:
//splitoff.ru/tehn-doc.html