Daikin REMQ12P Manual de instalación descargar pdf (Pagina 16)

Installation manual

REMQ8P9 + REMQ10~16P8 + REMHQ12P8Y1B

VRVIII System air conditioner

4PW48463-1A

7. LEAK TEST AND VACUUM DRYING

The units were checked for leaks by the manufacturer.

After connecting the ﬁeld piping, perform the following inspections.

1 Preparations

Referring to ﬁgure 23, connect a nitrogen tank, a refrigerant tank

and a vacuum pump to the outdoor unit and perform the

airtightness test and the vacuum drying.

The refrigerant tank and the charge hose connected to the

refrigerant charge port or valve A are needed to perform

refrigerant charging.

2 Airtightness test and vacuum drying

■ Airtightness test:

Pressurize the liquid pipe, the suction gas pipe, the high

pressure/low pressure gas pipe and the equalizer pipe from the

service ports of each stop valve to 4.0 MPa (40 bar) (do not

pressurize more than 4.0 MPa (40 bar)). If the pressure does not

drop within 24 hours, the system passes the test. If the pressure

drops, check where the nitrogen leaks from.

Note 1 When the equivalent pipe length between outdoor and indoor units is 90 m or more, the size of the main

liquid pipe must be increased. Never increase suction gas pipe and HP/LP gas pipe sizes.

Depending on the length of the piping, the capacity may drop, but even in such a case it is possible to

increase the size of the main liquid pipe.

Note 2 Allowable length after the ﬁrst refrigerant branch kit to indoor units is 40 m or less, however it can be extended up to 90 m if all the following conditions are fulﬁlled.

Required conditions Example drawings

It is necessary to increase the pipe size of the liquid and suction gas pipe if the pipe length between the

ﬁrst and the ﬁnal branch kit is over 40 m (reducers must be procured on site). Increasing the HP/LP gas

pipe size is not allowed.

■ If the increased liquid pipe size is larger than the pipe size of the main liquid pipe, then the pipe size of

the main liquid pipe needs to be increased as well.

■ If the increased suction gas pipe size is larger than the pipe size of the main suction gas pipe, then the

allowable length after the ﬁrst refrigerant branch kit may not be increased to 90 m.

Size-up of the main suction gas pipe may affect a good oil return to the outdoor unit due to inﬂuence of

the HP/LP gas pipe.

indoor unit 8:

b+c+d+e+f+g+p≤90 m

increase the pipe size

of b, c, d, e, f, g

Increase the pipe size as follows

For calculation of total extension length, the actual length of above pipes must be doubled (except length of

main pipes and of pipes which do not have an increased pipe size).

a+b*2+c*2+d*2+e*2+f*2+g*2

+h+i+j+k+l+m+n+p≤1000 m

Indoor unit to the nearest branch kit ≤40 m h, i, j....... p≤40 m

The difference between the distance of the outdoor unit to the farthest indoor unit and the distance of the

outdoor unit to the nearest indoor unit ≤40 m

The most remote indoor unit 8

The nearest indoor unit 1

(a+b+c+d+e+f+g+p)–(a+h)≤40 m

8+10

12~16

9.5 ➞ 12.7

12.7 ➞ 15.9

18~24

26~48

15.9 ➞ 19.1

19.1 ➞ 22.2

REY(H)Q Ø REY(H)Q Ø

1 Outdoor unit 4 First refrigerant

branch kit

2 Main pipes

3 Increase only liquid

pipe size

5 BS unit

6 Indoor unit

Gas side Liquid side

REYQ18~22 Ø28.6 ➞ Ø31.8

(a)

(a) If not available, increase is not allowed

Ø9.5 ➞ Ø12.7

REYQ24 Ø34.9 — Ø12.7 ➞ Ø15.9

REYQ26~34 Ø34.9 ➞ Ø38.1

(a)

Ø15.9 ➞ Ø19.1

REYQ36~48 Ø41.3 — Ø19.1 ➞ Ø22.2

REYHQ16+20+22 Ø28.6 ➞ Ø31.8

(a)

REYHQ24 Ø34.9 —

— Increase is not allowed

ab c d e f

ABCDEFG

1234567

hijklmn

1 Outdoor unit

2 Refnet joints (a~g)

3 Indoor units (1~8)

1 Gauge manifold

2 Nitrogen

3 Measuring instrument

4 Refrigerant R410A tank (siphon system)

5 Vacuum pump

6 Charge hose

7 Equalizer pipe stop valve

8 High pressure/low pressure pipe stop valve

9 Suction gas line stop valve

10 Liquid line stop valve

11 Refrigerant charge port

12 Valve A

13 Valve B

14 Valve C

15 To BS unit or indoor unit

16 Stop valve

17 Service port

18 Field piping

19 Gas ﬂow

NOTE

Make sure to perform airtightness test

and vacuum drying using the service

ports of the stop valves of the

equalizer pipe, HP/LP gas pipe,

suction gas pipe and liquid pipe. (For

the service port location, refer to the

"Caution" label attached on the front

panel of the outdoor unit.)

■ See "11.3. Stop valve operation procedure" on

page 18 for details on handling the stop valve.

■ To prevent entry of any contamination and to

prevent insufﬁcient pressure resistance, always

use the special tools dedicated for working with

R410A refrigerant.

NOTE

Make sure to use nitrogen gas.

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 35 36

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Daikin REMQ12P Manual de instalación Pagina 16

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