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Piping Diagrams
SiBE28-804
254
Appendix
3.7
Re-using Existing Field Piping
3.7.1 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.
* RZQS can not be reused.
3.7.2 How to Re-use Existing Piping?
Notes:
Oil contamination can be checked using the Daikin “Oil Checker Card”.
Caution:
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.
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 R-410A: See table on page 278)
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 page 274.
Check the following item in
"(2) REFRIGERANT PIPE SIZE" and
"(3) ALLOWABLE PIPE LENGTH AND
HEIGHT DIFFERENCE" on page 276.
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.
Summary of Contents for FHQ100BUV1B x 2
Page 13: ...SiBE28 804 2 ...
Page 19: ...Model Name and Power Supply SiBE28 804 8 General Information ...
Page 29: ...Specifications SiBE28 804 18 Specifications ...
Page 33: ...Wired Remote Controller SiBE28 804 22 Remote Controller 1 2 Installation ...
Page 34: ...SiBE28 804 Wired Remote Controller Remote Controller 23 ...
Page 93: ...Outdoor Unit Fan Speed Control SiBE28 804 82 Functional Description ...
Page 131: ...Test Run and Operation Data SiBE28 804 120 Test Operation ...
Page 251: ...Troubleshooting by Remote Controller Display LED Display SiBE28 804 240 Troubleshooting ...
Page 277: ...PCB Layout SiBE28 804 266 Appendix ...
Page 297: ...RZQ100 140C7 RZQS125 140C7V1B SiBE28 804 286 Removal Procedure ...
Page 311: ...SiBE28 804 iv Index ...