Precautions Concerning Piping Connection And Valve Operation - Mitsubishi Electric CITY MULTI Series Installation Manual

Limitation of the amount of refrigerant to be charged
g
The above calculation result of the amount of refrigerant to be charged must become below the value in the table below.
For PQHY-P·Y(S)LM-A1, PQHY-P·Y(S)LM-A2
Heat source unit model
Maximum amount of refrigerant kg [oz]
*1
Heat source unit model
Maximum amount of refrigerant kg [oz]
*1
For PQRY-P·Y(S)LM-A1, PQRY-P·Y(S)LM-A2
Heat source unit model
Maximum amount of refrigerant kg [oz]
*1
Heat source unit model
Maximum amount of refrigerant kg [oz]
*1
*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 Check that the refrigerant service valve is fully closed (clockwise).
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
connecting pipe (Tightening torque 12 N·m [120 kg·cm] ).
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.11)
<A> Service valve for refrigerant
(Liquid side/brazed for PQHY-P series)
(High-pressure side/brazed for PQRY-P series)
<B> Service valve for refrigerant
(Gas side/brazed for PQHY-P series)
(Low-pressure side/brazed for PQRY-P series)
Shaft
A
Service port
B
Cap
C
Pinched connecting pipe severing portion
D
Pinched connecting pipe brazing portion
E
Warning:
• The areas between the refrigerant service valves and the pinched
connecting pipes are filled with gas and refrigerant oil. Extract the gas
and refrigerant oil in that section before heating the brazed section.
- If the brazed section is heated without first extracting the gas and
refrigerant oil, the pipe may burst or the pinched connecting pipe may blow
off and ignite the refrigerant oil, causing serious injury.
Caution:
• Place a wet towel on the refrigerant service valve before heating the
brazed section to keep the valve temperature from exceeding 120˚C
[248˚F].
• Direct the flame away from the wiring and metal sheets inside the unit.
Caution:
• Refrigerant pipe connection
This product includes connecting pipes for front piping. (Refer to [Fig.10.2.2])
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.
30
P200 P250 P300
21.0 [741] 28.0 [988] 29.5 [1041]
P550 P550S P600
55.5 [1958] 54.5 [1923] 57.0 [2011]
P200 P250 P300
27.0 [953] 32.0 [1129] 33.0 [1165]
P550 P550S P600
57.0 [2011] 61.5 [2170] 58.0 [2046]
P350 P400 P400S
41.5 [1464] 50.0 [1764] 50.0 [1764]
P600S P700S P750S
55.5 [1958] 65.5 [2311] 67.5 [2381]
P350 P400 P400S
52.0 [1835] 52.0 [1835] 52.0 [1835]
P600S P700S P750S
64.5 [2276] 72.0 [2540] 74.0 [2611]
<Example of refrigerant piping connection>
[Fig.10.2.2] (P.11 - 12)
Connecting elbow (ID 25.4 [1], OD 25.4 [1]) (Gas/Low-pressure) <Included
1
with heat source unit>
Connecting elbow (ID 28.6 [1-1/8], OD 28.6 [1-1/8]) (Gas) <Included with
2
heat source unit>
Connecting pipe (ID 9.52 [3/8], OD 9.52 [3/8]) (Liquid) <Included with heat
3
source unit>
Connecting pipe (ID 15.88 [5/8], OD 15.88 [5/8]) (Liquid) <Included with heat
4
source unit>
Connecting pipe (ID 19.05 [3/4], OD 19.05 [3/4]) (High-pressure) <Included
5
with heat source unit>
Connecting pipe (ID 28.6 [1-1/8], OD 28.6 [1-1/8]) (Low-pressure) <Included
6
with heat source unit>
Connecting pipe (ID 25.4 [1], OD 22.2 [7/8]) (High-pressure) <Included with
7
heat source unit>
Water stopper (Liquid / High-pressure)
8
Water stopper (Gas/Low-pressure)
9
Sealing material for water stopper (Liquid)
0
Sealing material for water stopper (Gas / Low-pressure)
a
Sealing material for field piping (Liquid / High-pressure)
b
Sealing material for field piping (Gas / Low-pressure)
c
Sealing material for base leg
d
Sealing material for base leg
e
Sealing material for water panel
f
Pipe cover (Gas / Low-pressure)
g
Sealing material for drain socket
h
<A> Front pipe routing
<B> Low-pressure side PQRY-P series (Gas side PQHY-P series)
<C> High-pressure side PQRY-P series (Liquid side PQHY-P series)
Shape
A
Without a low-pressure twinning pipe
B
With a low-pressure twinning pipe (PQRY-P series ONLY)
C
Refrigerant service valve pipes
D
Field-supplied piping (low-pressure connecting pipe)
E
Field-supplied piping (high-pressure connecting pipe)
F
Twinning kit (sold separately)
G
Field-supplied piping (low-pressure connecting pipe: to BC controller)
H
Field-supplied piping (low-pressure connecting pipe: to heat source unit)
I
*1 To attach the Twinning pipe (sold separately), refer to the
instructions included in the kit.
*2 Connection pipe is not used when the Twinning kit is attached.
• Pipe routing (for PQHY-P series)
P200~P300
: Use the included connecting pipe 3 to connect.
P350 : Use the pipe joint (field supply) and the included
connecting pipe 4 to connect.
P400~P600
: Use the included connecting pipe 4 to connect.
P200~P300 : Use the pipe joint (field supply) and the included
connecting elbow 1 to connect.
P350~P600
: Use the included connecting elbow 2 to connect.
• Pipe routing (for PQRY-P series)
P200 : Use the pipe joint (field supply) and the included
connecting pipe 5 to connect.
P250, P300
: Use the included connecting pipe 5 to connect.
P350~P600
: Use the included connecting pipe 7 to connect.
P200~P300 : Use the pipe joint (field supply) and the included
connecting elbow 1 to connect.
P350~P550
: Use the included connecting pipe 6 to connect.
P600 : Use the pipe joint (field supply) and the included
connecting pipe 6 to connect.
P450 P450S P500
51.5 [1817] 51.5 [1817] 53.5 [1888]
P800S P850S P900S
67.5 [2381] 70.0 [2470] 70.0 [2470]
P450 P450S P500
53.0 [1870] 53.0 [1870] 55.0 [1941]
P800S P850S P900S
74.0 [2611] 76.0 [2681] 76.0 [2681]
*1, *2
P500S
53.5 [1888]
P500S
55.0 [1941]