Daikin SERHQ020BAW1, Installer And User Reference Manual

5 Preparation

Installer and user reference guide

12

SERHQ020~0 SEHVX20~64BAW

Split packaged air-cooled water chiller

4P508020-1B – 2018.04

In  places  with  weak  reception,  keep  distances  of  3  m  or  more  to
avoid  electromagnetic  disturbance  of  other  equipment  and  use
conduit tubes for power and transmission lines.

5.2.2

Installation site requirements of the
indoor unit

INFORMATION

Also read the following requirements:

▪ General  installation  site  requirements.  See  the

"General safety precautions" chapter.

▪ Service  space  requirements.  See  the  "Technical  data"

chapter.

▪ Refrigerant 

piping 

requirements 

(length, 

height

difference). See further in this "Preparation" chapter.

▪ Provide  sufficient  space  around  the  unit  for  servicing  and  air

circulation.

▪ Make  sure  the  installation  site  withstands  the  unit's  weight  and

vibration.

▪ Make sure the unit is level.

▪ Select  the  location  of  the  unit  in  such  a  way  that  the  sound

generated by the unit does not disturb anyone, and the location is
selected according the applicable legislation.

▪ Take  care  that  in  the  event  of  a  water  leak,  water  cannot  cause

any damage to the installation space and surroundings.

▪ During installation, avoid the possibility that anybody can climb on

the unit or place objects on the unit.

▪ All  piping  lengths  and  distances  have  been  taken  into

consideration (see 

"5.3.3 About the piping length" on page 13

).

Do NOT install the unit in the following places:

▪ In potentially explosive atmospheres.

▪ In  places  where  there  is  machinery  that  emits  electromagnetic

waves.  Electromagnetic  waves  may  disturb  the  control  system,
and cause malfunction of the equipment.

▪ In  places  where  there  is  a  risk  of  fire  due  to  the  leakage  of

flammable  gases  (example:  thinner  or  gasoline),  carbon  fibre,
ignitable dust.

▪ In  places  where  corrosive  gas  (example:  sulphurous  acid  gas)  is

produced. Corrosion of copper pipes or soldered parts may cause
the refrigerant to leak.

▪ In  places  where  a  mineral  oil  mist,  spray  or  vapour  may  be

present  in  the  atmosphere.  Plastic  parts  may  deteriorate  and  fall
off or cause water leakage.

NOTICE

This  is  a  class  A  product.  In  a  domestic  environment  this
product  may  cause  radio  interference  in  which  case  the
user may be required to take adequate measures.

CAUTION

Appliance NOT accessible to the general public, install it in
a secured area, protected from easy access.

This  unit  is  suitable  for  installation  in  a  commercial  and
light industrial environment.

5.3

Preparing refrigerant piping

5.3.1

Refrigerant piping requirements

NOTICE

The  refrigerant  R410A  requires  strict  cautions  for  keeping
the system clean, dry and tight.

▪ Clean and dry: foreign materials (including mineral oils

or  moisture)  should  be  prevented  from  getting  mixed
into the system.

▪ Tight:  R410A  does  not  contain  any  chlorine,  does  not

destroy  the  ozone  layer,  and  does  not  reduce  earth's
protection  against  harmful  ultraviolet  radiation.  R410A
can  contribute  slightly  to  the  greenhouse  effect  if  it  is
released.  Therefore  pay  special  attention  to  check  the
tightness of the installation.

NOTICE

The  piping  and  other  pressure-containing  parts  shall  be
suitable  for  refrigerant.  Use  phosphoric  acid  deoxidised
seamless copper for refrigerant.

▪ Foreign materials inside pipes (including oils for fabrication) must

be ≤30 mg/10 m.

▪ Temper  grade:  use  piping  with  temper  grade  in  function  of  the

pipe diameter as listed in table below.

Pipe Ø

Temper grade of piping material

≤15.9 mm

O (annealed)

≥19.1 mm

1/2H (half hard)

▪ The  pipe  thickness  of  the  refrigerant  piping  shall  comply  with  the

applicable  legislation.  The  minimal  pipe  thickness  for  R410A
piping must be in accordance with the table below.

Pipe Ø

Minimal thickness t

6.4 mm/9.5 mm/12.7 mm

0.80 mm

15.9 mm

0.99 mm

19.1 mm/22.2 mm

0.80 mm

28.6 mm

0.99 mm

34.9 mm

1.21 mm

41.3 mm

1.43 mm

5.3.2

To select the piping size

Determine  the  proper  size  using  the  following  tables  and  reference
figure (only for indication).

G

L

G1

L2

G2

L1

1

2

Indoor unit

Outdoor unit

▪ Piping connection sizes

Indoor unit

Gas

Liquid

Outdoor unit

Gas

Liquid

SEHVX20BAW

Ø25.4 mm

Ø12.7 mm

1× SERHQ020BAW1

Ø22.2 mm

Ø9.52 mm

SEHVX32BAW

Ø25.4 mm

Ø12.7 mm

1× SERHQ032BAW1

Ø28.6 mm

Ø12.7 mm

SEHVX40BAW

Ø25.4 mm

Ø12.7 mm

2× SERHQ020BAW1

Ø22.2 mm

Ø9.52 mm

SEHVX64BAW

Ø25.4 mm

Ø12.7 mm

2× SERHQ032BAW1

Ø28.6 mm

Ø12.7 mm

▪ Field piping sizes