Mitsubishi Electric PUHY-200YMF-B Service Handbook page 92

3 Time required for recovering refrigerant from low pressure service port (minute)
(kg/cm
Refrigerant amount
to be drawn out (kg)
1
2
3
4
5
6
7
8
9
10
11
4 Additional evacuation, refrigerant replacement, and refrigerant replacement
R2 series has unique refrigerant circuit structure which makes possible 2-pipe cooling-heating simultaneous
operations. Therefore, in the case of total replacement or replenishment of refrigerant in this system, the following
evacuation and refrigerant replenishment procedures are required.
1 Perform evacuation by connecting to system analyzer joint of service port of high pressure ball valve and high
pressure charge plug, and joint of service port of low pressure ball valve and low pressure charge plug.
2 Perform refrigerant charge from low pressure circuit only, after finishing evacuation, closing vacuum pump valve,
shutting off high pressure circuit of system analyzer, and opening valve of refrigerant cylinder.
(In case service port of ball valve and charge plug can not be jointed as shown in the figure, use two vacuum
pumps and evacuate high pressure side and low pressure side circuits separately.)
Note 1: Though refrigerant gas itself is harmless, airtight room should be opened before gas release for preventing
oxygen shortage.
2: When releasing gas, use blotting paper, etc. so that oil spouted with the gas does not spread out.
C
A Ball valve of the high pressure side
B Service port
C Ball valve of the low pressure side
D Charge plug
E High pressure
F Low pressure
G Evacuation
H Evacuation
I Replenish of refrigerant
J System analyzer
K Lo knob
L Hi knob
M 3-way joint
Low pressure
2
G) (MPa)
3.5~4.5
(0.34~0.44)
4.0
8.0
12.0
16.0
20.0
24.0
28.0
32.0
36.0
40.0
44.0
D
E
F
A
B
4.5~5.5 5.5 ~ 7.5
(0.44~0.54) (0.54~0.74)
3.5 3.5
7.0 6.5
10.5 10.0
14.0 13.0
18.0 16.5
21.5 19.5
25.0 23.0
28.5 26.0
32.0 29.5
35.5 32.5
39.0 36.0
J
HI
LO
K L
M
G
H
I
N Valve
O Valve
P Flon 22 cylinder
Q R407C cylinder
R Scale
S Vacuum pump
P-YMF-B : Use a vacuum pump with a reverse flow
check valve
T A high-precision gravimeter measurable up to 0.1kg
should be used. If you are unable to prepare such a
high-precision gravimeter, you may use a charge
cylinder.
–90–
for PURY-(P)200·250YMF-B
N
S
O
T
P
R
Q P-YMF-B
R