Daikin LRYEN10A7Y1, Installation And Operation Manual

14 Charging refrigerant

Installation and operation manual

25

LRYELRNUN5A7Y1
CO

₂

 Conveni-Pack outdoor unit and capacity up unit

4P605461-1 – 2020.04

NOTICE

In case of maintenance and the system (outdoor unit+field
indoor  units)  does  not  contain  any  refrigerant  any
more (e.g., after refrigerant reclaim operation), the unit has
to  be  charged  with  its  original  amount  of  refrigerant  (refer
to the nameplate on the unit) and the determined additional
refrigerant amount.

NOTICE

Do NOT fully close the liquid stop valve after the refrigerant
has been charged into the unit.

NOTICE

Do  NOT  fully  close  the  liquid  stop  valve  while  the  unit  is
stopping.  The  field  liquid  piping  might  burst  because  of
liquid seal.

14.2

To determine additional refrigerant
amount: method 1

Use method 1 for an outdoor unit WITHOUT a capacity up unit.

1

Calculate each amount of refrigerant for the liquid piping using
the 

Calculation table 

in this chapter, based on the piping size

and  length: 

(a)  (b)

  and 

(c)

.  You  may  round  off  to  the  nearest

0.1 kg.

2

Total  the  amounts  of  refrigerant  for  the  liquid  piping:

(a)+(b)+(c)=[1]

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)=[2]

6

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

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

7

Charge the total amount of refrigerant 

[4]

.

8

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

[6]

.

9

Total  the  calculated  amount  of  refrigerant 

[4]

,  the  additional

amount  of  refrigerant  during  test  run 

[6]

,  and  the  factory

charged  amount  of  refrigerant 

[5]

  (see  label  on  the  unit).  The

total amount of refrigerant in the system is thus: 

[4]+[5]+[6]=[7]

10

Note down the calculation results in the calculation table.

INFORMATION

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

Calculation table: outdoor unit without capacity up unit

Amount of refrigerant for liquid piping (refrigeration / 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

(a)

Ø12.7

0.0858

(b)

Ø15.9

0.1333

(c)

Subtotal (a)+(b)+(c):

[1]

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):

[2]

Required amount of refrigerant for outdoor unit
(kg)

17.0

 [3]

Subtotal [1]+[2]+[3] (kg)

[4]

Factory charged amount of refrigerant into
outdoor unit (kg)

6.3

 [5]

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

[6]

Total amount of refrigerant [4]+[5]+[6] (kg)

(a)

[7]

(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 [6]≤[2]×0.1 to calculate this maximum amount.

Conversion ratio for indoor units: refrigeration

Applicable for outdoor unit without capacity up unit.

Type

Conversion ratio

Blower coil

0.062 kg/kW

Showcase

0.309 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

14.3

To determine additional refrigerant
amount: method 2

Use method 2 for an outdoor unit WITH a capacity up unit.

1

Calculate each amount of refrigerant for the liquid piping using
the 

Calculation table

 in this chapter, based on the piping size

and length: 

(a1) (b1)

(c1)

 and 

(a2) (b2)

(c2)

. You may round off

to the nearest 0.1 kg.

NOTICE

The  conversion  ratio  for  the  capacity  up  unit  is  different
from  the  conversion  ratio  for  the  outdoor  unit.  Thus,
calculate  the  refrigeration  side  and  air  conditioner  side
separately.

2

Total  the  amounts  of  refrigerant  for  the  liquid  piping:

(a1)+(b1)+(c1)=[1], (a2)+(b2)+(c2)=[2]

.