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3
Refrigerant piping design
3-6. Charging requirement with additional refrigerant
After finishing vacuuming, exchange the vacuum pump with a refrigerant canister and start additional charging of refrigerant.
Refrigerant amount charged in factory
Calculation of additional refrigerant charge amount
Refrigerant charge amount factory default does not include the refrigerant for pipes at the local site.
For refrigerant to be charged in pipes at the local site, calculate the amount and charge it additionally.
When the additional refrigerant amount indicates minus as the result of calculation, it is not necessary to subtract any refrigerant.
Calculating formula
Table 1
Table2
*1: Capacity code of 005 type is the same as 007 type.
(kg)
Table 3
Outdoor unit type
MHP0404
MHP0504
MHP0604
Charging amount (kg)
3.9
3.9
3.9
Liquid pipe diameter (mm)
6.4
9.5
Additional refrigerant amount /1 m liquid pipe (kg/m)
0.025
0.055
Capacity rank
005(*1)
007
009
012
015
018
024
027
030
036
048
056
Capacity code (Equivalent to HP)
0.8
0.8
1.0
1.25
1.7
2.0
2.5
3.0
3.2
4.0
5.0
6.0
Indoor unit
model name
4-way cassette
MMU-AP****H
-
-
0.4
0.4
0.8
0.8
0.8
0.8
0.8
1.2
1.2
1.2
MMU-AP****MH*
0.4
0.4
0.4
0.4
0.6
0.6
-
-
-
-
-
-
2-way cassette MMU-AP****WH*
-
0.4
0.4
0.4
0.5
0.7
0.7
0.7
0.7
1.1
1.1
1.1
1-way cassette MMU-AP****YH / SH*
-
0.4
0.4
0.4
0.5
0.5
0.6
-
-
-
-
-
Duct
MMD-AP****BH*
-
0.3
0.3
0.3
0.5
0.5
0.8
0.8
0.8
1.1
1.1
1.1
MMD-AP****S(P)H*
0.3
0.3
0.3
0.3
0.5
0.5
0.8
0.8
-
-
-
-
MMD-AP****H*
-
-
-
-
-
0.8
1.0
1.0
-
1.0
1.3
-
Under-ceiling
MMC-AP****HP*
-
-
-
-
0.6
0.6
0.8
0.8
-
1.2
1.2
1.2
MMC-AP****H*
-
-
-
-
0.5
0.5
0.7
0.7
-
1.1
1.1
-
High wall
MMK-AP****H*
-
0.5
0.5
0.5
0.7
0.7
0.7
-
-
-
-
-
MMK-AP****MH*
-
0.3
0.3
0.3
-
-
-
-
-
-
-
-
Floor standing
MMF-AP****H*
-
-
-
-
0.7
0.7
1.0
1.0
-
1.3
1.3
1.3
MML-AP****H*
-
0.5
0.5
0.5
0.5
0.8
0.8
-
-
-
-
-
MML-AP****BH*
-
0.3
0.3
0.3
0.5
0.5
0.7
-
-
-
-
-
MML-AP****NH*
-
0.5
0.5
0.5
0.5
0.5
-
-
-
-
-
-
Outdoor unit capacity type
MCY-
MHP0404
MHP0504
MHP0604
Compensation by outdoor HP (kg)
-1.6
-1.6
-1.6
NOTE
Additional refrigerant
charge amount at
lacal site (kg)
Real length of
liquid pipe
Additional refrigerant
charge amount per 1 m
liquid pipe (Table 1)
Corrective amount of
refrigerant depending on
the indoor units (Table 2)
Compensation by
outdoor HP (Table 3)
=
x
+
+
