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System with different indoor unit types
How to calculate the additional refrigerant to be charged
When combining different indoor unit types, additional refrigerant
amount calculation should be done based on the used pipe system.
■
When using 2 pipe system (for connection of EKHVMRD or
EKHBRD), please use correction factor A=1.
■
When using 3 pipe system (for connection of EKHVMYD),
please use correction factor A=1.1.
2 pipe system
A
R = ∑ R
x
R
= [((X
x Ø15.9) x 0.18) + ((X
x
1
+ ((X
x Ø9.5) x 0.059)] x A
3
X
= Total length (m) of liquid piping size at Øa
1...3
See the example below for more information.
Example
a
b
c
d
e
f
A
B
C
D
E
h
i
j
k
l
1
2
3
4
5
Unit 1~5: EKHVMRD (2 pipe)
Unit 7: EKHVMRD (2 pipe)
Unit 6+8: EKHVMYD (3 pipe)
System liquid piping
a
b
c
d
e
f
A
B
C
D
E
h
i
j
k
l
1
2
3
4
5
System discharge piping
a
b
c
d
e
f
A
B
C
D
E
h
i
j
k
l
1
2
3
4
5
System suction piping
a
b
c
d
e
f
Distance
Correction factor (A)
a+b+c+d+e+f+g+p
h+i+j+k+l+n
m
Refnet
A+B+C+D+E+G
F
EMRQ8~16AAY1
Daikin Altherma outdoor unit
4PW61262-1B – 2013.11
Pipe system
3 pipe system
1
1.1
x Ø12.7) x 0.12)
2
g
H1
F
G
p
m
n
6
7
H2
8
g
H1
F
G
p
m
n
6
7
H2
8
g
H1
F
G
p
m
n
6
7
H2
8
g
H1
F
p
m
6
H2
8
Pipe system
1.1
3
1
2
1.1
3
Refnet type
KHRQ22*
KHRQ23*
Additional refrigerant to be charged R (kg)
R should be rounded off in units of 0.1 kg
R = R
+R
+R
1
2
3
R
~(a+b+c+d+e+g)
1
R
= [((X
x Ø15.9) x 0.18) + ((X
1
1
+ ((X
x Ø9.5) x 0.059)] x 1.1
3
R
~(h+i+j+k+l+n)
2
R
= [((X
x Ø15.9) x 0.18) + ((X
2
1
+ ((X
x Ø9.5) x 0.059)] x 1
3
R
~(m)
3
R
= [((X
x Ø15.9) x 0.18) + ((X
3
1
+ ((X
x Ø9.5) x 0.059)] x 1.1
3
X
= Total length (m) of liquid piping size at Øa
1...3
13.4. Method for adding refrigerant
Precautions when adding refrigerant
Be sure to charge the specified amount of refrigerant in liquid state.
Since this refrigerant is a mixed refrigerant, adding it in gas form may
cause the refrigerant composition to change, preventing normal
operation.
■
Before charging, check whether the refrigerant cylinder is
equipped with a siphon tube or not.
Charge the liquid
refrigerant with the
cylinder in upright
position.
■
Be sure to use tools exclusively for R410A to ensure required
pressure resistance and to prevent foreign materials from mixing
into the system.
Charging with an unsuitable substance may cause
explosions and accidents, so always make sure that the
appropriate refrigerant (R410A) is charged.
Refrigerant containers must be opened slowly.
■
When charging a system, charging over the
permissible quantity can cause liquid hammer.
■
Always use protective gloves and protect your eyes
when charging refrigerant.
x Ø12.7) x 0.12)
2
x Ø12.7) x 0.12)
2
x Ø12.7) x 0.12)
2
Charge the liquid
refrigerant with the
cylinder in up-side-down
position.
Installation manual
24
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