Mitsubishi Electric SRK05CR-S, Техническое руководство

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- -
'15 • SRK-T-171
– 33 –
Flaring work
•
Measur ement B
Copper pipe
Flaring block
Copper pipe
diameter
Measurement B (mm)
Use a flare tool designed for R410A or a
conventional flare tool. Please note that
measurement B (protrusion from the flaring block)
will vary depending on the type of a flare tool in
use. If a conventional flare tool is used, please use a
copper pipe gauge or a similar instrument to check
protrusion so that you can keep measurement B to a
correct value.
Clutch type flare tool
for R410A
Conventional (R22) flare tool
Clutch type Wing nut type
ø 6.35 0.0~0.5 1.0~1.5 1.5~2.0
ø 9.52 0.0~0.5 1.0~1.5 1.5~2.0
ø 12.7 0.0~0.5 1.0~1.5 2.0~2.5
ø 15.88 0.0~0.5 1.0~1.5 2.0~2.5
Connect the pipes on both liquid and gas sides.
Tighten the nuts to the following torque.
N
·
m (kgf
·
m)
Liquid side (ø 6.35) 14.0 ~ 18.0 (1.4~1.8)
Gas side (ø 9.52) 34.0 ~ 42.0 (3.4~4.2)
(ø 12.7) 49.0 ~ 61.0 (4.9~6.1)
(ø 15.88) 68.0 ~ 82.0 (6.8~8.2)
CAUTION
Do not apply excess torque to the
•
nuts.
Otherwise, the nuts may crack
depending on the conditions and
refrigerant leak may occur.
Indoor Outdoor
Liquid side
Gas side
(Do not turn)
Liquid side
Gas side
Additional refrigerant charge
Securely tighten the operation valve cap and the check joint blind nut after adjustment.
Operation valve size
(mm)
Operation valve cap
tightening torque (N·m)
Check joint blind nut
tightening torque (N·m)
ø 6.35 (1/4")
20 ~ 30
10 ~ 12
ø 9.52 (3/8")
ø 12.7 (1/2")
25 ~ 35
ø 15.88 (5/8") 30 ~ 40
Compound pressure gauge
Operation valve cap
Operation valve
(three-way valve)
Operation valve
cap
-0.1MPa
(-76cmHg)
Handle Lo
Pressure gauge
Handle Hi
Charge hose
(Designed specifically for R410A)
Vacuum pump adapter
(Anti-reverse flow type)
(Designed specifically for R410A)
Vacuum pump
Charge hose (Designed specifically for R410A)
Check joint
Operation valve
(two-way valve)
Gauge manifold
(Designed specifically
for R410A)
①
Tighten all flare nuts in the pipings both indoor and
outside wall so as not to cause leak.
②
Connect operation 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 evacuation.
Continue the vacuum or evacuation operation for 15
minutes or more and check to see that the vacuum
gauge reads -0.1MPa.
④
After completing vacuum operation, close the Lo
handle and stop operation of the vacuum pump.
⑤
After completing vacuum operation, fully open
operation valve (Both gas and liquid sides) with
hexagon headed wrench.
⑥
Check for possible leakage of gas in the connection
parts of both indoor and outdoor.
•
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 run-
ning back into an air-conditioning system may cause the refrigerant
cycle to break down.
When refrigerant piping exceeds 5m conduct additional refrigerant charge after refrigerant sweeping.
5m over 15m: Additional charge amount per meter = 10g/m
[Example]
How much amount of additional charge for 15m piping?
(15 - 5)m × 10g/m = 100g 100g for additional charge
Connection of refrigerant piping
Air purge
Keep the openings of the pipes covered with tapes etc. to prevent dust, sand, etc. from entering them.
•
Remove the flared nuts.
(on both liquid and gas
sides)
•
Remove the flared nuts.
(on both liquid and gas
sides)
•
Install the removed flared nuts to the
pipes to be connected, then flare the
pipes.
CAUTION
•
Do not apply
refrigerating machine
oil to the surface.
A
r o o d t u O r o o d n I
(Do not turn)
e v o m e R e v o m e R
s s e r P s s e r P
Dimension A
Liquid side : ø6.35: 9.1
Gas side ø9.52: 13.2
ø12.7: 16.6
ø15.88: 19.7
(Unit : mm)
Connection of refrigerant pipings
Preparation
90±0.5°
RMA012A080_091-093_EN.indb 33 05/11/2014 11:50:41
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