UK BIGRAC GEN 24 - Flipbook - Page 68
GENERAL INDEX
Notes on renewal for simultaneous operation of multiple
units.
Only main pipe is applicable for using the different
diameter size.
In case of different diameter size for the branch pipes, a
new installation work for a standard size is necessary.
Be sure to use our genuine branch piping for refrigerant
R32.
Main pipe
· Only the main pipe L can be used among different
diameter’s existing piping
· Installation work as a standard size is capable for L1, L2,
1 - 4 piping
· Be sure to use our genuine branch piping for refrigerant
R32
1. In case of single unit:
It is not necessary to charge with additional refrigerant
until the chargeless pipe length in the table 2.
If the pipe length is exceeding the charge less pipe
length, charge with additional refrigerant amount per
1 m according to the equivalent length.
L
Branch pipe
L1
1
L2
3
2
4
2. In case of simultaneous operation of multiple units:
Calculate the refrigerant charging amount according to
the calculating method of the standard piping diameter.
As to the additional refrigerant charging amount per
1 m, refer to the additional amount in the table 2.
Notes on renewal for simultaneous operation of multiple units
Capacity class
Standard liquid pipe size
Standard gas pipe size
Type 50
Ø 6,35
Ø 12,70
Type from 60 to 140
Ø 9,52
Ø 15,88
Type 200
Ø 12,70
Ø 22,22
Type 250
Ø 12,70
Ø 22,22
Measurement procedure for renewal
Observe the following procedure when reusing the existing piping or carrying out renewal installation work.
Flowchart of existing piping measures criteria for PZH and PZ series outdoor unit.
Start
Do existing piping size and piping length satisfy the
standard under the conditions?
See Table 1 – 2
N
Existing refrigerant piping
cannot be used as is.
Make sure to install a new
piping.
N
Collect the refrigerant by the
refrigerant recovery equipment.
Y
Can existing air conditioner run in the cooling mode?
Y
Flare nut size (mm)
Piping size
Ø6,35
Ø9,52 Ø12,70 Ø15,88 Ø19,05
For R32 /
R410A
17
22
26
29
36
For R22 /
R407C
17
22
24
27
36
See Table 3.
Level “3 Over” according to colour
scale level
Perform the test operation in cooling mode for over
30 minutes and collect the remaining refrigerant
without stopping operation.
Remove existing indoor and outdoor units.
Remove existing indoor and
outdoor units.
Check inside the piping from the pipe end.
N
Is the oil remained inside the piping transparent?
N
Y
Is the residue inside the piping removed?
· Use our genuine branch piping for
refrigerant R32
· Re-process the flare of existing
piping for R410A and use the flare
nut attached to the service valve of
the outdoor unit (for R32)
* Please do not reuse the existing flare to prevent gas
leak.
* Please make sure to install new flare.
68
N
Y
Has the compressor in existing air conditioner been
operated without any trouble?
Y
Carry out the installation work according to
Installation Instructions.
Wash it thoroughly or make sure
to install a new piping.
Existing refrigerant piping cannot
be used as is.
