Refrigerant Piping - Daikin RWEYQ72 Engineeiring Data

Installation
WARNING
• Use only specified wire and connect wires to terminals tightly.
Be careful that wires do not place external stress on terminals.
Keep wires in neat order so as not to obstruct other equipment.
Incomplete connections could result in overheating, and in worse
cases, electric shock or fire.
CAUTION
Precautions when laying power wiring
Use round pressure terminals for connections to the power terminal
block.
Round pressure
terminal
When none is available, follow the instructions below.
•
Do not connect wiring of different thicknesses to the power ter-
minal block. (Slack in the power wiring may cause abnormal
heat.)
•
When connecting wiring which is the same thickness, do as
shown in the figure below.
Connect same- It is forbidden to
thickness wiring connect two to
to both sides. one side.
•
For wiring, use the designated power wire and connect firmly,
then secure to prevent outside pressure being exerted on the
terminal board.
•
Use an appropriate screwdriver for tightening the terminal
screws. A screwdriver with a small head will strip the head and
make proper tightening impossible.
•
Over-tightening the terminal screws may break them.
•
See the table below for tightening torque for the terminal
screws.
M5 (Power terminal block)
M5 (Ground)
M3 (Transmission wiring terminal block)
Precautions when connecting the ground
When pulling the ground wire out, wire it so that it comes through
the cut out section of the cup washer. (An improper ground connec-
tion may prevent a good ground from being achieved.)
Round pressure terminal
40

Power wire
It is forbidden to
connect wiring of
different thicknesses.
Tightening torque
(ft · lbf)
2.21-3.02
0.59-0.72

Cup washer
Cut out section
8-5 In case of a local setting
If necessary, do the local settings as mentioned in the table below.
For setting, refer to the plate "Cares to be taken in servicing" attached
to the cover of electrical components box.
Typical local settings
 For other settings than mentioned in the table below, refer to the
equipment design materials and service manual.
This setting is done when switching between cooling
(1)Setting of switching
and heating is performed by a switching remote con-
between cooling and
troller (sold separately as an accessory) installed on
heating
the outside unit.
(2)Setting to prohibit This setting is done when the outside units are not
sequenced start started in a sequenced order.
(3)Setting of centralized These settings are done when the interlocks are con-
interlock Setting of exter- nected in a lump-sum manner or when performing a
nal demand demand operation by external instruction.
This setting is done when making an abnormal dis-
(4)Setting of abnormal dis-
play (HJ) on a remote controller when the interlock
play when interlock con-
contact is OFF (when the heat source water pump is
tact is OFF
not operated).
CAUTION
A separate adapter (sold separately as an accessory) for exter-
nal control of an outside unit is necessary when doing a demand
operation from an external instruction, setting of cooling and
heating through a centralized remote controller for cooling and
heating (sold separately as an accessory) and setting of central-
ized interlock. For details, refer to the manual attached to the
adapter.
9.

REFRIGERANT PIPING

CAUTION
After completing installation, be sure to open the valves.
(See 9-9 Additional refrigerant charge for details) (Operating
the unit with the valves shut will break the compressor.)
Use R410A to add refrigerant. (The R410A refrigerant cylinder
has a pink stripe painted around it.)
All field piping must be installed by a licensed refrigeration tech-
nician and must comply with relevant local and national regula-
tions.
CAUTION TO BE TAKEN WHEN BRAZING REFRIGERANT
PIPING
Do not use flux when brazing copper-to copper refrigerant piping.
(Particularly for the HFC refrigerant piping) Therefore, use the
phosphor copper brazing filler metal (BCuP-2: JIS Z 3264/B-
Cu93P-710, 795: ISO 3677) which does not require flux.
(Flux has an extremely negative effect on refrigerant piping sys-
tems. For instance, if the chlorine based flux is used, it will cause
pipe corrosion or, in particular, if the flux contains fluorine, it will
damage the refrigerant oil.)
NOTE
• Installation tools:
Gauge manifold, charge hose, etc.
Make sure to use installation tools that are exclusively used for
R410A installations to withstand the pressure and to prevent
foreign materials (e.g. mineral oils such as SUNISO and mois-
ture) from mixing into the system.
(The screw specifications differ for R410A and R407C.)
Vacuum pump
1.
Use a 2-stage vacuum pump with a non-return valve.
2.
Make sure the pump oil does not flow oppositely into the sys-
tem while the pump is not working.
3.
Use a vacuum pump which can evacuate to –14.6 psi.
9-1 Selection of piping material
1.
Foreign materials inside pipes (including oils for fabrication) must
be 9 mg/10 ft or less.
2.
Use the following material specification for refrigerant piping:
•
Construction material: Phosphoric acid deoxidized seamless
copper for refrigerant.
•
Size: Determine the proper size referring to chapter "Example
of connection".
EDUS30-900-N
Installation of Outdoor Units