Installation Manual

12
Installation Manual
the added refrigerant according to the diameter and the
length of the liquid side pipe of the outdoor unit/indoor unit
connection.(suitable for throttle outdoor unit)
Table 9-1
Liquid tube (mm) R410A R22
Ø 6.35
Ø 9.52
Ø 12.7
Ø 15.9
Ø 19
0.022 kg/m×(L-5)
0.011 kg/m×(L-5)
0.060 kg/m×(L-5)
0.030 kg/m×(L-5)
0.110 kg/m×(L-5)
0.060 kg/m×(L-5)
0.170 kg/m×(L-5)
0.085 kg/m×(L-5)
0.250 kg/m×(L-5)
0.125 kg/m×(L-5)
0.030 kg/m×(L-5)
0.015 kg/m×L
0.065 kg/m×(L-5)
0.030 kg/m×L
0.115 kg/m×(L-5)
0.060 kg/m×L
0.190 kg/m×(L-5)
0.095 kg/m×L
0.290 kg/m×(L-5)
0.145 kg/m×L
orifice in the indoor unit
orifice in the outdoor unit
orifice in the outdoor unit
orifice in the outdoor unit
orifice in the outdoor unit
orifice in the outdoor unit
orifice in the indoor unit
orifice in the indoor unit
orifice in the indoor unit
orifice in the indoor unit
9. AIR EVACUATION
Safety Precautions
CAUTION
U Useavacuumpumpwithagaugereadinglower
than -0.1MPa and an air discharge capacity above
40L/min.
U Theoutdoorunitdoesnotneedvacuuming.DO
NOT open the outdoor unit’s gas and liquid stop
valves.
U EnsurethattheDompoundNeterreads-0.1MPaor
below after 2 hoursPGPQFSBUJPO. If after  hoursthe
gauge reading is still above0.1MPa, check if there is
a gas leak or water insidethe pipe. If there is no
leakage, perform anotherevacuation for 1 or 2
hours.
U DO NOT use refrigerant gas to evacuate the
system.
Evacuation Instructions
Before using Bmanifold gauge and Bvacuum pump, read
their operation manuals to familiarize yourself with how to
use them properly.
Manifold Hauge
Compound gauge
-76cmHg
Lowpressure valve
Charge hose
Highpressure valve
Charge hose
Vacuum pump
Pressure gauge
Lowpressure valve
Fig. 9.1
 Connect the charge hose of the manifold gauge toUIF
service port on the outdoor unit’s lowpressure valve.
 Connect another charge hose from the manifold gauge
to the vacuum pump.
 Open the MowQressure side of the manifold gauge.
Keep the IighQressure side closed.
 Turn on the vacuum pump to evacuate the system.
 Run the vacuum for at least 15 minutes, or until the
Dompound Neter reads -76cmHG (-1x105Pa).
 Close the MowQressure side of the manifold gauge and
turn off the vacuum pump.
 Wait 5 minutes, then check that there has been no
change in system pressure.
NOTE: The table above refers to the liquid tube.
The number of bends is up to the length of the max. height drop.
Usually a bend is necessary every 10 m.
If a negative result is achieved for R from Table 9-1, no refrigerant
needs to be added or removed.
Additional refrigerant will be twice R from Table 9-1 if the indoor
unit installed throttle assembly.
NOTE: If there is no change in system pressure, unscrew
the cap from the packed valve (highpressure valve). If
there is a change in system pressure, there may be a gas
leak.
Note Pn Adding Refrigerant
8. Insert Bhexagonal wrench into the packed valve (high
pressure valve) and open the valve by turning the
wrench in a 1/4 counterclockwise turn. Listen for gas to
exit the system, then close the valve after 5 seconds.
Flare nut
Cap
Valve body
Valve stem
Fig. 9.2
 Watch the Qressure Hauge for  minute to FOsurethere
is no change in pressure. The Qressure Haugeshould
read slightly higher than UIFatmospheric pressure.
 Remove the charge hose from the service port.
 Using Bhexagonal wrench, fully open both the high
pressure and lowpressure valves.
OPEN VALVE STEMS GENTLY
When opening UIFvalve stems, turn the hexagonal
wrenchuntil it hits against the stopper.DO NOT try to
force the valve to open further.
12.Tighten UIFvalve caps by hand, then tighten UIFN using
the proper tool.
CAUTION
U Refrigerantchargingmustbeperformedafterwiring,
vacuumingandtheleaktest.
U DO NOT exceed the maximum allowable quantityof
refrigerant or overcharge the system. Doing socan
damage or impact the unit’s function.
U Chargingwithunsuitablesubstancesmaycause
explosionsoraccidents.Ensurethattheappropriate
refrigerantisused.
U Refrigerantcontainersmustbeopenedslowly.Always
useprotectivegearwhenchargingthesystem.
U DO NOT mix refrigerants types.
The outdoor unit is factory charged with refrigerant. Calculate