Daikin ERQ Series Service Manual page 81

Pipe Ø
15.9
19.1
O = Annealed
1/2H = Half hard
The pipe thickness of the refrigerant piping should comply
with relevant local and national regulations. The minimal pipe
thickness for R410A piping must be in accordance with the
table below.
Pipe Ø
6.4
9.5
12.7
15.9
19.1
22.2
28.6
3 In case the required pipe sizes (inch sizes) are not available, it is
also allowed to use other diameters (mm sizes), taken the
following into account:
select the pipe size nearest to the required size.
use the suitable adapters for the change-over from inch to
mm pipes (field supply.
Cautions for brazing
Be sure to carry out a nitrogen blow when brazing.
Brazing without carrying out nitrogen replacement or releasing
nitrogen into the piping will create large quantities of oxidized
film on the inside of the pipes, adversely affecting valves and
compressors in the refrigerating system and preventing normal
operation.
When brazing while inserting nitrogen into the piping, nitrogen
must be set to 0.02 MPa with a pressure-reducing valve (=just
enough so that it can be felt on the skin).
1 Refrigerant piping
2 Part to be brazed
3 Taping
4 Hands valve
5 Pressure-reducing valve
6 Nitrogen
For details, see manual of the outdoor unit.
Installation and operation manual
72
Temper grade of piping material
O
1/2H
Minimal thickness (mm)
0.80
0.80
0.80
0.99
0.80
0.80
0.99
V
ALVE KIT INSTALLATION
Mechanical installation
1 Remove the valve kit box cover by unscrewing 4x M5.
2 Drill 4 holes on correct position (measurements as indicated in
figure below) and fix the valve kit box securely with 4 screws
through the provided holes Ø9 mm.
NOTE Make sure that the expansion valve is installed
vertically.
Refer to figure 8 for the required service space.
Brazing work
For details, see manual of the outdoor unit.
3 Prepare the inlet/outlet field piping just in front of the connection
(do not braze yet).
192.5 mm
C
B
A Inlet coming from the outdoor unit
B Outlet to air handling unit
C Pipe fixing clamp
4 Remove the pipe fixing clamp (C) by unscrewing 2x M5.
5 Remove the upper and lower pipe insulations.
6 Braze the field piping.
Make sure to cool the filters and valve body with
a wet cloth and make sure the body temperature
does not exceed 120°C during brazing.
Make sure that the other parts such as electrical
box, tie wraps and wires are protected from direct
brazing flames during brazing.
7 After brazing, put the lower pipe insulation back in place and
close it with the upper insulation cover (after pealing off the
liner).
8 Secure the pipe fixing clamp (C) in place again (2x M5).
9 Make sure that field pipes are fully insulated.
Field pipe insulation must reach up to the insulation you have put
back in place as per procedure step 7. Make sure that there is
no gap between both ends in order to avoid condensation
dripping (finish the connection with tape eventually).
Option kit for combination of Daikin condensing units
A
EKEQFCBAV3 + EKEQDCBV3
with field supplied air handling units
4P383212-1 - 2014.08