Table des Matières
Publicité
10.. 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 12N·m [120kg·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..1] (P.9)
<A> Service valve for refrigerant
(Liquid side/brazed for PQHY-P·Z(S)KMU-A)
(High-pressure side/brazed for PQRY-P·Z(S)KMU-A)
<B> Service valve for refrigerant
(Gas side/brazed for PQHY-P·Z(S)KMU-A)
(Low-pressure side/brazed for PQRY-P·Z(S)KMU-A)
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.
4
<Example of refrigerant piping connection>
[Fig.10..] (P.9)
Connecting elbow (ID 25.4 [1], OD 25.4 [1]) <Included with heat source unit>
1
Connecting pipe (ID 25.4 [1], OD 19.05 [3/4]) <Included with heat source
2
unit>
Connecting pipe (ID 9.52 [3/8], ID 9.52 [3/8]) <Included with heat source
3
unit>
Water stopper (Liquid)
4
Water stopper (Gas/Low-pressure)
5
Sealing material for water stopper (Liquid)
6
Sealing material for water stopper (Gas / Low-pressure)
7
Sealing material for field piping (Liquid / High-pressure)
8
Sealing material for field piping (Gas / Low-pressure)
9
Pipe cover (Gas / Low-pressure)
0
Sealing material for drain socket
a
<A> Front pipe routing
<B> Low-pressure side PQRY-P·Z(S)KMU-A (Gas side PQHY-P·Z(S)KMU-A)
<C> High-pressure side PQRY-P·Z(S)KMU-A (Liquid side PQHY-P·Z(S)KMU-A)
Shape
A
Without a low-pressure twinning pipe
B
With a low-pressure twinning pipe (PQRY-P·ZSKMU-A 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·ZKMU-A)
P72
: Use the included connecting pipe 3 to connect.
P96, P120
P72
: Use the included connecting pipe 1, 2 to connect.
P96, P120
: Use the pipe joint (field supply) and the included
connecting pipe 1 to connect.
•
Pipe routing (for PQRY-P·ZKMU-A)
P72
: Use the pipe joint (field supply) and connect to the
refrigerant service valve piping.
P96, P120
: Expand the high-pressure side field-supplied piping
(ID19.05 [3/4'']) and connect to the refrigerant
service valve piping.
P72
: Use the included connecting pipe 1, 2 to connect.
P96, P120
: Use the pipe joint (field supply) and the included
connecting pipe 1 to connect.
Satisfy the minimum insertion depth in the table below when expanding field-
supplied piping
Pipe diameter
(mm [in])
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
refrigerant circuit may be subjected to abnormal pressure and may damage
the compressor, four-way valve, etc.
•
Determine the amount of additional refrigerant charge by using the formula,
and charge refrigerant through the service port after connecting the pipes.
•
Tighten the service port and cap securely so gas does not leak. (Refer to the
table below for appropriate tightening torque.)
Minimum insertion depth
(mm [in])
6 [1/4]
7 [9/32]
8 [11/32]
10 [13/32]
12 [1/2]
14 [9/16]
Publicité
Chapitres
Table des Matières
