Refrigerant Piping; Installation Tools; Selection Of Piping Material; Pipe Connection - Daikin VRV III REMQ8P7Y1B Installation Manual

Hide thumbs Also See for VRV III REMQ8P7Y1B:

Operation manual (12 pages)

Table Of Contents

Table of Contents

EFRIGERANT PIPING

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 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.

Do not open stop valves until all ﬁeld wiring is according to

the speciﬁcations (refer to

the checking of the unit has been completed and all

installation conditions are fulﬁlled (refer to

unit and installation conditions" on page

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.

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.

(The screw speciﬁcations differ for R410A and R407C.)

Use a 2-stage vacuum pump with a non-return valve which can

evacuate to –100.7 kPa (5 Torr, –755 mm Hg).

NOTE

Make sure the pump oil does not ﬂow oppositely into

the system while the pump is not working.

Installation manual

"8. Field wiring" on page

11),

"10. Checking of

16).

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:

Size: determine the proper size referring to chapter

"6.6. Example of connection" on page

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.

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.

Minimal thickness

Pipe Ø

t (mm)

6.4

0.80

9.5

0.80

12.7

0.80

15.9

0.99

19.1

0.80

Make sure to use the particular branches of piping that have

been selected referring to chapter

on page

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 5

ﬁrst.

NOTE

The pressure regulator for the nitrogen released when

doing the brazing should be set to 0.02 MPa or less.

(See ﬁgure 10)