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Installation manual

7

20B7Y1R

Air cooled refrigeration condensing unit

4P360438-1B – 2014.01

• Do not use the existing piping in the following cases. Perform new 

piping instead.

• The piping is different in size.
• The strength of the piping is insufficient.
• The compressor of the condensing unit previously used caused a 

malfunction.
An adverse influence of residual substances, such as the oxidation 
of refrigerant oil and the generation of scale, is considered.

• If the indoor unit or outdoor unit is disconnected from the piping for 

a long time.
The intrusion of water and dust into the piping is considered.

• The copper pipe is corroded.
• The refrigerant of the condensing unit previously used was other 

than R410A (e.g., R404A / R507 or R407C). 
The contamination of the refrigerant with heterogeneity is 
considered.

• If there are welded connections midway on the local piping, make 

gas leakage checks on the welded connections.

• Be sure to insulate the connection piping.

The liquid and gas pipe temperatures are as follows:
Liquid pipe arrival minimum temperature: 0°C
Gas pipe arrival minimum temperature: –45°C
In the case of thickness insufficiency, add additional insulation 
material or renew the existing insulation material.

• Renew the insulation material if the insulation material is degraded.

Keep the following points in mind for the reuse of existing heat 
exchangers

• Units with insufficient design pressure (since this product is an 

R410A unit) require a lower-stage design pressure of 2.5 MPa 
[25 bars].

• Units for which the path to the heat exchanger has been routed so 

that the flow of refrigerant is from bottom to top

• Units with copper tubing or fan corrosion
• Units that may be contaminated with foreign matter such as 

rubbish or other dirt

6-1 Selection of piping material

• Make sure that the inner side and outer side of the piping used is clean and free of contaminants, such as sulphur, oxide, dust, chips, oil and fat, and water.

It is desirable that the maximum oil adhesion in the piping is 30 mg per 10 m.

• Use the following type of refrigerant piping.

Material: Seamless phosphorus deoxidized copper tube (C1220T-O for a maximum outer diameter of 15.9 mm and C1220T-1/2H for a minimum 

outer diameter of 19.1 mm)

Refrigerant piping size and wall thickness: Decide the size and thickness from the following table.

(This product uses R410A. The withstand pressure of O type may be insufficient if it is used for piping with a minimum diameter of 
19.1 mm. Therefore, be sure to use 1/2 H type with a minimum thickness of 1.0 mm.
If O type is used for piping with a minimum diameter of 19.1 mm, a minimum thickness of 1.2 mm will be required. In that case, be sure 
to perform the blazing of each joint.)

• Be sure to perform piping work within the range specified in the 

following tables.

Refrigerant piping length

1

 Master unit

Slave unit

Outdoor unit multi-connection 

piping kit

Gas piping

Showcase

Blower coil

Max. permissible one-way piping length 
(equivalent length)

Te 

–20°C

a + b + c + d+g2 

130 m

(d is d1 or d2 whichever is longer)
Te <–20°C
a + b + c + d+g2 <100 m
(d is d1 or d2 whichever is longer)

Total length of the gas pipes between the 
outdoor units and the outdoor unit 
multi-connection piping kit
(g=g1+g2)

g

10 m

g1

g2

Max. branch piping length (actual length)

b + c + d 

30 m (d is d1 or d2 whichever is longer)

Max. difference in 
height between 
indoor and outdoor 
units

unit below outdoor 
unit

35 m (Note)

unit above outdoor 
unit

10 m 

Note

A trap is required at 5 m intervals from the outdoor unit.
Make sure the pressure drop is as small as possible.

Refrigerant piping size

(Unit: mm)

Outdoor unit side

Piping size
Liquid pipe

Gas pipe

Outdoor unit 
multi-connection piping 
kit (G1, G2, g1, g2)

Ø12.7 x 0.8 (O type)

Ø34.9 x 1.2 (1/2 H type or H type)

Main piping (A,a)

Ø19.1 x 1.0 (1/2 H type or H type)

Ø41.3 x 1.45 (1/2 H type or H type)

d1

e

B

d2

C

c

D1

F

E

f

D2

A

b

a

H

G1

g1

g2

G2

1

2

3

5

6

4

Summary of Contents for LREQ15B7Y1R

Page 1: ...INSTALLATION MANUAL LREQ15B7Y1R LREQ20B7Y1R Air cooled refrigeration condensing unit...

Page 2: ...jennom positiv bed mmelse av B if lge Sertifikat C som det fremkommer i den Tekniske Konstruksjonsfilen D og gjennom positiv bed mmelse av E Anvendt modul F G Risikokategori H Se ogs neste side 13 jot...

Page 3: ...PS vastav k llastunud temperatuur M C Jahutusaine N Surve turvaseadme seadistus P bar Tootmisnumber ja tootmisaasta vaadake mudeli andmeplaati 21 PS K bar TS TSmin L C TSmax PS M C N P bar 22 Maksima...

Page 4: ...accordance with the instructions in this installation manual Improper installation may result in water leakage electric shocks or fire When installing the unit in a small room take measures so that t...

Page 5: ...containing less than 95 kg refrigerant charge CAUTION This unit is already filled with a certain amount of R410A Never open liquid and gas shutoff valve until the step specified in 9 CHECKS AFTER WOR...

Page 6: ...ber of indoor units be sure to install them at the same level Use either off cycle defrosting or electric heater defrosting as the defrosting type Hot gas defrosting models cannot be used Make sure th...

Page 7: ...for front side no higher than 1500 mm Wall height on the suction side no higher than 500 mm Wall height for sides no limit Make sure each unit is installed level Install the slave unit adjacent to the...

Page 8: ...See Engineering Data for details 5 If the outdoor units are installed in areas with heavy snowfall the installation of a snowbreak hood is required This is available as an optional accessory If the un...

Page 9: ...hen installing on a roof make sure the roof floor is strong enough and be sure to water proof all work Make sure the area around the machine drains properly by setting up drainage grooves around the f...

Page 10: ...used is clean and free of contaminants such as sulphur oxide dust chips oil and fat and water It is desirable that the maximum oil adhesion in the piping is 30 mg per 10 m Use the following type of re...

Page 11: ...f indoor units connected downstream Total capacity of indoor units after branching Liquid pipe size less than 4 0 kW 6 4 x 0 8 O type 4 0 kW over and less than 14 0 kW 9 5 x 0 8 O type 14 0 kW over an...

Page 12: ...plete Wait until all oil is dripped out 7 Cut the pinched piping off with a pipe cutter just above the brazing point or just above the marking in case there is no brazing point 8 Wait until all oil is...

Page 13: ...t to the valve cover mount and the screw thread of the service port Otherwise dew condensation water will intrude inside and freeze Therefore refrigerant gas leakage or a compressor malfunction may re...

Page 14: ...nnected at the lateral side bottom CAUTION Only use the dedictated outdoor unit multi connection piping kit EKHRQZM When brazing make sure there are no flammable materials around 1 Connect gas side ac...

Page 15: ...oisture Follow instructions in the dryer instruction manual concerning dryer brazing Repair any burning of dryer paint that occurs during dryer brazing Contact the manufacturer for more information ab...

Page 16: ...to install an earth leakage circuit breaker This unit uses an inverter so install the earth leakage circuit breaker that be capable of handling high harmonics in order to prevent malfunctioning of the...

Page 17: ...field supply 7 3 Procedure for power supply wiring Procedure for Power Supply Wiring 1 Power supply 3 phase 50 Hz 380 415 2 Overcurrent circuit breaker earth leakage circuit breaker all pole disconne...

Page 18: ...stem on page 13 by all means when connecting the operation output wiring A compressor failure may result if the operating output wiring is not connected Remote switch wiring connections When installin...

Page 19: ...ut operation output wiring from the front 10 When routing remote operating switch wiring from the front 11 Remote switch terminal block X3M 12 When routing remote switch wiring through a wiring openin...

Page 20: ...e the outdoor unit for one hour and then check that the reading on the vacuum gauge is not rising If the reading on the vacuum gauge is rising water may be remaining in the system or leakage may be oc...

Page 21: ...page 19 see the illustrations below Use the piping outlet for jobs required during the steps of 10 REFRIGERANT REPLENISHMENT on page 19 e g a job of taking in the charge hose Note After knocking out t...

Page 22: ...n operation d Turn off the operation switch of the outdoor unit after the speci fied amount of refrigerant is replenished To prevent liquid compression e Caution Fully open the shutoff valves on the g...

Page 23: ...in ballpoint or another non conducting object Close the inspection door after the work is finished A Inspection hole upper left B Inspection hole upper right 1 Inspection door left 2 Lift to open 3 Op...

Page 24: ...malfunction code items can be displayed on the condensing unit 1 Make sure that the LED H1P is off If the LED is on press the MODE button BS1 once 2 Press the MODE button BS1 once The LED H1P starts b...

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Page 28: ...4P360438 1B 2014 01 Copyright 2013 Daikin 4P360438 1 B 0000000_...

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