Daikin ERQ125A7W1B Installation Manual Download

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Installation manual

ERQ125~250A7W1B

Inverter condensing unit

4PW51323-1C – 2018.04



Support the unit with a foundation of 67 mm wide or more. (The
support leg of the unit is 67 mm wide, see

figure 7



Fasten the unit in place using four
foundation bolts M12. It is best to screw in
the foundation bolts until their length
remains 20 mm above the foundation
surface.

EFRIGERANT

PIPING

6.1.

Installation tools

Make sure to use installation tools (gauge manifold charge hose,
etc.) that are exclusively used for R410A installations to withstand the
pressure and to prevent foreign materials (e.g. mineral oils such as
SUNISO and moisture) from mixing into the system.

Use a 2-stage vacuum pump with a non-return valve which can
evacuate to –100.7 kPa (5 Torr, –755 mm Hg).

6.2.

Selection of piping material

Foreign materials inside pipes (including oils for fabrication)
must be 30 mg/10 m or less.

Use the following material specification for refrigerant piping:



Construction material: phosphoric acid deoxidized seamless
copper for refrigerant.



Temper grade: use piping with temper grade in function of the
pipe diameter as listed in the table below.



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.

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).

6.3.

Pipe connection

Be sure to perform a nitrogen blow when brazing and to read the
paragraph

"Caution to be taken when brazing refrigerant piping" on

page 4

first.



Prepare a water drainage channel around the
foundation to drain waste water from around the unit.



If the unit is to be installed on a roof, check the
strength of the roof and its drainage facilities first.



If the unit is to be installed on a frame, install the
waterproofing board within a distance of 150 mm
under the unit in order to prevent infiltration of water
coming from under the unit.



When installed in a corrosive
environment, use a nut with
plastic washer (1) to protect the
nut tightening part from rust.

Do not insert fingers, rods or other objects into the air
inlet or outlet. When the fan is rotating at high speed, it
will cause injury.

Use R410A to add refrigerant.

All field piping must be installed by a licensed refrigeration
technician and must comply with relevant local and
national regulations.

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) which does not require flux.

Flux has extremely harmful influence on refrigerant piping
systems. 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.

Be sure to perform a nitrogen blow when brazing. Brazing
without performing 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.

After completing the installation work, check that the
refrigerant gas does not leak.

Toxic gas may be produced if the refrigerant gas leaks into
the room and comes in contact with a source of fire.

Ventilate the area immediately in the event of a leak.

In the event of a leak, do not touch the leaked refrigerant
directly. Frostbite may be caused.

NOTE

Make sure the pump oil does not flow oppositely into
the system while the pump is not working.

20 mm

Pipe Ø

Temper grade of piping material

≤

15.9

≥