Air Purge - Mitsubishi Heavy Industries SRK18YLV-S1 Technical Manual

Air purge

① Tighten all flare nuts in the pipings both
indoor and outside so as not to cause
leak.
② Connect service valve, charge hose,
manifold valve and vacuum pump as is
illustrated right.
③ Open manifold valve handle Lo to its
full width, and perform vacuum or evac-
uation.
Continue the vacuum or evacuation
operation for 15 minutes or more and
check to see that the vacuum gauge
reads – 0.1 MPa (– 76 cmHg).
④ After completing vacuum operation, ful-
ly open service valve (Both gas and liq-
uid sides) with hexagon headed wrench.
⑤ Detach the charge hoses.
⑥ Check for possible leakage of gas in the
connection parts of both indoor and out-
door.
● Since the system uses check joints differing in diameter from those found on the conventional models, a charge hose (for R22) presently in use is not
applicable.
Please use one designed specifically for R410A.
● Please use an anti-reverse flow type vacuum pump adapter so as to prevent vacuum pump oil from running back into the system.
Oil running back into an air-conditioning system may cause the refrigerant cycle to break down.
♦ Additional refrigerant charge
Model
Additional refrigerant
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.
② Finishing and fixing
ⓐ Tie up the piping with wrapping tape, and shape it so that it conforms
to which the pipe is attached.
ⓑ Fix them with clamps as right figure.
How to relocate or dispose of the unit
• In order to protect the environment, be sure to pump down (recovery of
refrigerant).
• Pump down is the method of recovering refrigerant from the indoor unit
to the outdoor unit when the pipes are removed from the unit.
<How to pump down>
① Connect charge hose to check joint.
② Liquid side : Close the liquid valve with hexagon wrench key.
Gas side : Fully open the gas valve.
Carry out cooling operation. (If indoor temperature is low, operate
forced cooling operation.)
③ After low pressure gauge become 0.01MPa, stop cooling operation and
close the gas valve.
Service valve
(two-way valve)
Securely tighten the service valve cap and the check joint blind nut after adjustment.
Service valve size
ø6.35 (1/4")
ø12.7 (1/2")
SRK/C18YLV-S1
Less than 15m : Not required
more than 15m : 20g/m
Service valve
cap
-0.1MPa
(-76cmHg)
Handle Lo
Service valve
(three-way valve)
Service valve
cap
Check joint
Charge hose (Designed specifically for R410A)
Service valve cap
(mm) tightening torque (N•m)
20~30
25~35
To cover the connecting portion with insula-
tion materials, cut upper portion and then seal
Vinyl tape
it with insulation materials.
Insulation
Refrigerant piping
Electrical wiring
Covering tape
Drain hose
Tapping screw
● Forced cooling operation
Turn on a power source again after a while after turn
off a power source. Then press continually the ON/
OFF button 5 seconds or more.

- -
'16 • SRK-T-192
Compound pressure gauge
Pressure gauge
Gauge manifold
(Designed specifically for R410A)
Handle Hi
Charge hose
(Designed specifically for R410A)
Vacuum pump adapter
(Anti-reverse flow type)
(Designed specifically for R410A)
Vacuum pump
Check joint blind nut
tightening torque (N•m)
10~12
Cover the exterior portion with cov-
ering tape and shape the piping so it
will match the contours of the route
that the piping to take. Also fix the
wiring and pipings to the wall with
clamps.
Unit ON/OFF button