Precautions Concerning Piping Connection And Valve Operation - Mitsubishi Electric PQHY-P-TLMU-A Manuel D'installation

Limitation of the amount of refrigerant to be charged
The above calculation result of the amount of refrigerant to be charged must become below the value in the table below.
Heat source unit model
Maximum amount of refrigerant *1 kg [LBS]
Heat source unit model
Maximum amount of refrigerant *1 kg [LBS] 56.0 [124]
Heat source unit model
Maximum amount of refrigerant *1 kg [LBS]
Heat source unit model
Maximum amount of refrigerant *1 kg [LBS] 57.0 [126]
*1: Amount of additional refrigerant to be charged on site
10.2. Precautions concerning piping
connection and valve operation
Conduct piping connection and valve operation accurately and carefully.
Removing the pinched connecting pipe
When shipped, a pinched connecting pipe is attached to the on site high-
pressure/liquid and low-pressure/gas valves to prevent gas leakage.
Take the following steps 1 through 4 to remove the pinched connecting
pipe before connecting refrigerant pipes to the heat source unit.
1
2 Connect a charging hose to the service port on the low-pressure/
high-pressure liquid/gas refrigerant service valve, and extract the gas
in the piping between the refrigerant service valve and the pinched
3 After vacuuming gas from the pinched connecting pipe, sever the
pinched connecting pipe at the location shown in [Fig.10.2.1] and drain
the refrigerant.
4 After completing 2 and 3, heat the brazed section to remove the
pinched connecting pipe.
[Fig. 10.2.1] (P.10)
<A> Service valve for refrigerant
<B> Service valve for refrigerant
A
Shaft
B
Service port
C
Cap
D
Pinched connecting pipe severing portion
E
Pinched connecting pipe brazing portion
Warning:
The areas between the refrigerant service valves and the pinched
and refrigerant oil in that section before heating the brazed section.
refrigerant oil, the pipe may burst or the pinched connecting pipe may blow
Caution:
Place a wet towel on the refrigerant service valve before heating the brazed
Caution:
Refrigerant pipe connection
Check the high-pressure/low-pressure piping dimensions before connecting
the refrigerant pipe.
Refer to item 9.2 Refrigerant piping system for piping dimensions.
Make sure that the refrigerant pipe does not touch other refrigerants pipes,
unit panels, or base plates.
Use non-oxidative brazing when connecting pipes.
Do not burn the wiring and plate when brazing.
28
P72 P96 P120
22.0 [49] 28.5 [63] 29.5 [66]
P216 P216S P240
55.0 [122] 57.0 [126]
P72 P96 P120
28.0 [62] 32.0 [71] 33.0 [73]
P216 P216S P240
62.0 [137] 58.0 [128]
P144 P144S P168
42.0 [93] 42.0 [93] 51.5 [114]
P240S P288S P312S
56.0 [124] 67.5 [149] 67.5 [149]
P144 P144S P168
44.0 [98] 44.0 [98] 45.0 [100]
P240S P288S P312S
59.0 [131] 74.0 [164] 74.0 [164]
<Example of refrigerant piping connection>
[Fig.10.2.2] (P.10 - 11)
1
source unit>
2
unit>
3
4
5
6
7
8
9
Sealing material for base leg
0
Sealing material for base leg
a
Sealing material for water panel
b
c
Sealing material for drain socket
<A> Front pipe routing
<B>
<C>
A
Shape
B
Without a low-pressure twinning pipe
C
D
Refrigerant service valve pipes
E
F
G
H
I
instructions included in the kit.
*2 Connection pipe is not used when the Twinning Kit is attached.
Pipe routing (for PQHY-P·TLMU-A/YLMU-A)
: Use the included connecting pipe 3 to connect.
P72
P96, P120
: Use the included connecting pipe 1, 2 to connect.
P72
P96, P120
connecting pipe 1 to connect.
Pipe routing (for PQRY-P·TLMU-A/YLMU-A)
P72
refrigerant service valve piping.
P96, P120
service valve piping.
: Use the included connecting pipe 1, 2 to connect.
P72
P96, P120
connecting pipe 1 to connect.
supplied piping
Pipe diameter
5 [7/32] or more, less than 8 [11/32]
8 [11/32] or more, less than 12 [1/2]
12 [1/2] or more, less than 16 [21/32]
16 [21/32] or more, less than 25 [1]
25 [1] or more, less than 35 [1-13/32]
35 [1-13/32] or more, less than 45 [1-25/32]
After evacuation and refrigerant charging, ensure that the handle is fully
open. If keep the valve closed, the high- or low-pressure side of the
the compressor, four-way valve, etc.
P168S P192 P192S
51.5 [114] 53.5 [118] 53.5 [118]
P336S P360S
67.5 [149] 70.0 [155]
P168S P192 P192S
45.0 [100] 52.0 [115] 50.0 [111]
P336S
76.0 [168]
Minimum insertion depth
6 [1/4]
7 [9/32]
8 [11/32]
10 [13/32]
12 [1/2]
14 [9/16]