Daikin LRYEN10A7Y1, Installation And Operation Manual

15 Electrical installation

Installation and operation manual

26

LRYELRNUN5A7Y1

CO

₂

 Conveni-Pack outdoor unit and capacity up unit

4P605461-1 – 2020.04

3

Calculate the amount of refrigerant for the indoor units using the

Conversion  ratio  for  indoor  units:  refrigeration

  table  in  this

chapter,  based  on  the  type  of  indoor  units  and  the  cooling
capacity.

▪ Calculate the amount of refrigerant for blower coils: 

(d)

▪ Calculate the amount of refrigerant for showcases: 

(e)

4

Calculate  the  amount  of  refrigerant  for  air  conditioner  indoor
units  using  the 

Conversion  ratio  for  indoor  units:  air

conditioners 

table  in  this  chapter,  based  on  the  model  of

indoor units and the number of units connected: 

(f)

.

5

Total the amounts of refrigerant for indoor units: 

(d)+(e)+(f)=[3]

.

6

Total the calculated amounts of refrigerant and add the required
amount of refrigerant for outdoor unit: 

[1]+[2]+[3]+[4]=[5]

.

7

Charge the total amount of refrigerant 

[5]

.

8

If  a  test  runs  indicates  that  additional  refrigerant  is  needed,
charge the additional refrigerant and note down its amount: 

[7]

.

9

Total  the  calculated  amount  of  refrigerant 

[5]

,  the  additional

amount  of  refrigerant  during  test  run 

[6]

,  and  the  factory

charged  amount  of  refrigerant 

[7]

  (see  label  on  the  unit).  The

total amount of refrigerant in the system is thus: 

[5]+[6]+[7]=[8]

.

10

Note down the calculation results in the calculation table.

Calculation table: outdoor unit with capacity up unit

Amount of refrigerant for liquid piping (refrigeration)

Liquid
piping size

Conversion
ratio per
meter of
liquid
piping (kg/
m)

Piping
length (m)

Total
amount of
refrigerant
(kg)

Ø9.5

0.0582

(a1)

Ø12.7

0.1030

(b1)

Ø15.9

0.1603

(c1)

Subtotal (a1)+(b1)+(c1):

[1]

Amount of refrigerant for liquid piping (air conditioner)

Liquid
piping size

Conversion
ratio per
meter of
liquid
piping (kg/
m)

Piping
length (m)

Total
amount of
refrigerant
(kg)

Ø9.5

0.0487

(a2)

Ø12.7

0.0858

(b2)

Ø15.9

0.1333

(c2)

Subtotal (a2)+(b2)+(c2):

[2]

Amount of refrigerant for indoor units

Type of indoor unit

Total
amount of
refrigerant
(kg)

Blower coils

(d)

Showcases

(e)

Air conditioner units

(f)

Subtotal (d)+(e)+(f):

[3]

Required amount of refrigerant for outdoor unit
(kg)

17.0

 [4]

Subtotal [1]+[2]+[3]+[4] (kg)

[5]

Factory charged amount of refrigerant into
outdoor unit (kg)

6.3

 [6]

Additional amount of refrigerant charged when
test run if required (kg)

(a)

[7]

Total amount of refrigerant [5]+[6]+[7] (kg)

[8]

(a)

The maximum amount of additional refrigerant that can be
charged at the time of the test run is 10% of the amount of
refrigerant as calculated from the capacity of connected indoor
units. Use [7]≤[3]×0.1 to calculate this maximum amount.

Conversion ratio for indoor units: refrigeration

Applicable for outdoor unit with capacity up unit.

Type

Conversion ratio

Blower coil

0.091 kg/kW

Showcase

0.454 kg/kW

Conversion ratio for indoor units: air conditioners

Model

Conversion ratio

FXSN50

0.14 kg/unit

FXSN71

0.22 kg/unit

FXSN112

0.34 kg/unit

14.4

To charge refrigerant

When  charging  refrigerant  into  the  unit,  take  the  following  into
account:

1

Turn  ON  the  power  supply  of  the  outdoor  unit  and  all  indoor
units (air conditioners, blower coils, showcases).

2

Turn OFF the operation switch of the outdoor unit.

3

Charge refrigerant from the charge port of the stop valve on the
refrigeration liquid side. Keep the stop valve closed.

4

When  charging  is  finished,  attach  the  valve  caps  to  the  stop
valve and service port.

Pressure difference too low

If  the  pressure  difference  between  the  charging  cylinder  and
refrigerant  piping  is  too  low,  you  cannot  charge  anymore.  Continue
as  follows  to  decrease  the  pressure  in  the  piping  and  to  be  able  to
continue charging:

1

Open both air conditioner and refrigeration gas stop valves and
air conditioner liquid stop valve.

2

Adjust the opening of the refrigeration liquid stop valve. In case
of  long  field  piping  length,  the  outdoor  unit  will  automatically
stop  when  charging  refrigerant  with  the  liquid  stop  valve  fully
closed.

3

Turn ON the operation switch of the outdoor unit. The pressure
in  the  refrigerant  piping  will  drop,  and  charging  can  be
continued.

4

When the refrigerant is charged, turn OFF the operation switch.

5

Fully open all gas and liquid stop valves.

INFORMATION

After  charging,  add  the  total  amount  of  refrigerant  to  the
name plate on the front panel of the unit.

15

Electrical installation

DANGER: RISK OF ELECTROCUTION

WARNING

ALWAYS use multicore cable for power supply cables.

NOTICE

The  distance  between  the  high  voltage  and  low  voltage
cables should be at least 50 mm.