Daikin RZQ71~125B7V3B, Руководство по обслуживанию, Страница: 87 / 484

ESIE04-01 Functional Diagrams
Part 1 – System Outline 1–65
3
1
4
5
4.8 Re-using existing field piping
Introduction When installing a system using an RZQ outdoor unit, existing or pre-installed piping can be used
according to below specified conditions.
In all circumstances where these conditions can not be fully met, new piping has to be installed.
How to re-use
existing piping?
Notes: Oil contamination can be checked using the Daikin “Oil Checker Card”.
Caution:
P
If copper piping is corroded, existing piping re-use is not allowed.
P
Single side thermal insulation is not allowed for re-use.
P
See further notes in this section for Twin, Triple and Double Twin applications.
Check the existing
pipe size.
Check the existing pipe length.
See if the already installed air conditioner can operate and perform a
pump-down operation.
After 30 minutes of cooling operation, proceed with pump-down operation
without interruption.
Check the compressor (of the existing air conditioner) for fault records.
Remove the existing air conditioner.
See if the contamination inside the existing pipe is acceptable.
Rework the flare. (For R410A: See table )
Use the supplied flare nut.
Existing piping work for new air conditioner
Non-standard
size
All satisfactory
Longer than 50 m
Standard size
50 m or less
None
Exist
NO
OK
Both operation and pump-down are possible
Operation not possible
Pump-down operation
not possible
Not listed
Beyond
allowable
length range
No tolerance
for capacity
reduction
Reuse
of
existing
pipe
not
allowed
Check the existing pipe size and thickness
referring to the "(1) SELECTION OF PIPING
MATERIAL" (on the next page).
Check the following item in
"(2) REFRIGERANT PIPE SIZE" and
"(3) ALLOWABLE PIPE LENGTH AND
HEIGHT DIFFERENCE" (on the next page)
See if the length requirements for re-using
the existing piping are as specified.
See if the reduction of cooling capacity
may cause any problem.
on page 1–67.
on page 1–66.
on page 1–69.
RZQ - Final.book Page 65 Wednesday, September 8, 2004 8:40 AM