Re-Using Existing Field Piping - Daikin RZQ100B8V3B Service Manual

ESIE05-03
3.7

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?
Check the existing
pipe size.
Standard size
Check the existing pipe length.
50 m or less
See if the already installed air conditioner can operate and perform a
pump-down operation.
Both operation and pump-down are possible
After 30 minutes of cooling operation, proceed with pump-down operation
without interruption.
Remove the existing air conditioner.
Check the compressor (of the existing air conditioner) for fault records.
None
See if the contamination inside the existing pipe is acceptable.
OK
Rework the flare. (For R410A: See table
Use the supplied flare nut.
Existing piping work for new air conditioner
Notes: Oil contamination can be checked using the Daikin "Oil Checker Card".
Caution:
Part 1 – System Outline
Non-standard
size
All satisfactory
on page 1–33.
If copper piping is corroded, existing piping re-use is not allowed.
Single side thermal insulation is not allowed for re-use.
See further notes in this section for Twin, Triple and Double Twin applications.
Check the existing pipe size and thickness
referring to the "(1) SELECTION OF PIPING
on page 1–30.
MATERIAL" (on the next page).
Check the following item in
"(2) REFRIGERANT PIPE SIZE" and
"(3) ALLOWABLE PIPE LENGTH AND
on page 1–31.
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.
Longer than 50 m
Operation not possible
Pump-down operation
not possible
Exist
NO
)
Functional Diagrams
Not listed
Beyond
allowable
length range
Reuse
of
No tolerance
existing
for capacity
reduction
pipe
not
allowed
1–29
1
3
4
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