Daikin REYQ8U7Y1B, Installation And Operation Manual

7 Maintenance and service

Installation and operation manual

11

REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P546222-1B – 2020.10

Corner units

Ceiling suspended units

Wall-mounted units

For  the  following  conditions,  a  micro  computer  controls  the  air  flow
direction which may be different from the display.

Cooling

Heating

▪ When the room temperature is

lower 

than 

the 

set

temperature.

▪ When starting operation.

▪ When the room temperature is

higher 

than 

the 

set

temperature.

▪ At defrost operation.

▪ When operating continuously at horizontal air flow direction.

▪ When continuous operation with downward air flow is performed

at the time of cooling with a ceiling-suspended or a wall-mounted
unit, the micro computer may control the flow direction, and then
the user interface indication will also change.

The air flow direction can be adjusted in one of the following ways:

▪ The air flow flap itself adjusts its position.

▪ The air flow direction can be fixed by the user.

▪ Automatic 

 and desired position  .

WARNING

Never touch the air outlet or the horizontal blades while the
swing  flap  is  in  operation.  Fingers  may  become  caught  or
the unit may break down.

NOTICE

▪ The  movable  limit  of  the  flap  is  changeable.  Contact

your dealer for details. (only for double-flow, multi-flow,
corner, ceiling-suspended and wall-mounted).

▪ Avoid operating in the horizontal direction 

. It may

cause dew or dust to settle on the ceiling or flap.

6.5

Setting the master user interface

6.5.1

About setting the master user interface

a

b

d

c

c

c

c

e

e

e

e

e

b

a

Outdoor unit

b

BS unit

c

VRV DX indoor unit

d

HT Hydrobox unit

e

User interface

When  the  system  is  installed  as  shown  in  the  figure  above,  it  is
necessary  to  –  for  each  subsystem  –  designate  one  of  the  user
interfaces as the master user interface.

The  displays  of  slave  user  interfaces  show 

  (change-over

under  centralised  control)  and  slave  user  interfaces  automatically
follow the operation mode directed by the master user interface.

Only the master user interface can select heating or cooling mode.

7

Maintenance and service

NOTICE

NEVER  inspect  or  service  the  unit  by  yourself.  Ask  a
qualified service person to perform this work.

WARNING

NEVER  replace  a  fuse  with  a  fuse  of  a  wrong  ampere
ratings  or  other  wires  when  a  fuse  blows  out.  Use  of  wire
or copper wire may cause the unit to break down or cause
a fire.

CAUTION

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

CAUTION

After  a  long  use,  check  the  unit  stand  and  fitting  for
damage. If damaged, the unit may fall and result in injury.

NOTICE

Do  NOT  wipe  the  controller  operation  panel  with  benzine,
thinner,  chemical  dust  cloth,  etc.  The  panel  may  get
discoloured  or  the  coating  peeled  off.  If  it  is  heavily  dirty,
soak  a  cloth  in  water-diluted  neutral  detergent,  squeeze  it
well  and  wipe  the  panel  clean.  Wipe  it  with  another  dry
cloth.

7.1

About the refrigerant

This  product  contains  fluorinated  greenhouse  gases.  Do  NOT  vent
gases into the atmosphere.

Refrigerant type: R410A

Global warming potential (GWP) value: 2087.5

NOTICE

Applicable  legislation  on 

fluorinated  greenhouse  gases

requires  that  the  refrigerant  charge  of  the  unit  is  indicated
both in weight and CO

2

 equivalent.

Formula  to  calculate  the  quantity  in  CO

2

  equivalent

tonnes:

  GWP  value  of  the  refrigerant  ×  total  refrigerant

charge [in kg] / 1000

Please contact your installer for more information.

WARNING

The refrigerant in the system is safe and normally does not
leak. If the refrigerant leaks in the room, contact with a fire
of  a  burner,  a  heater  or  a  cooker  may  result  in  a  harmful
gas.

Turn  off  any  combustible  heating  devices,  ventilate  the
room and contact the dealer where you purchased the unit.

Do not use the system until a service person confirms that
the portion where the refrigerant leaks is repaired.

7.2

After-sales service and warranty

7.2.1

Warranty period

▪ This  product  includes  a  warranty  card  that  was  filled  in  by  the

dealer  at  the  time  of  installation.  The  completed  card  has  to  be
checked by the customer and stored carefully.