1-3.Refrigerant Charging Calculation - Mitsubishi Electric CITY MULTI Data Book

1. Piping Design
1-3. Refrigerant charging calculation
■ PQHY-P-T(S)LMU-A1/Y(S)LMU-A1
At the time of shipping, the heat source unit is charged with the refrigerant. As this charge does not include the amount needed
for extended piping, additional charging for each refrigerant line will be required on site. In order that future servicing may be
properly provided, always keep a record of the size and length of each refrigerant line and the amount of additional charge
by writing it in the space provided on the heat source unit.
(1) Calculation of additional refrigerant charge
Calculate the amount of additional charge based on the length of the piping extension and the size of the refrigerant
line.
Use the table to the below as a guide to calculating the amount of additional charging and charge the system
accordingly.
* When connecting PLFY-P08NBMU-E2, add 0.3kg [11oz] of refrigerant per indoor unit.
* When connecting PLFY-EP08NEMU-E, add 0.3kg [11oz] of refrigerant per indoor unit.
If the calculation results in a fraction of less than 0.1kg[1oz], round up to the next 0.1kg[1oz]. For example, if the result
of the calculation was 11.89kg[420.0oz], round the result up to 11.9kg[420oz].
<Additional Charge>
• Piping length from heat source unit to the most farthest indoor unit ≤ 30.5m[100ft] use the table [A]
• Piping length from heat source unit to the most farthest indoor unit > 30.5m[100ft] use the table [B]
Liquid Piping Size
Additional
Total length of
refrigerant charge
ø19.05mm [3/4in]
+
[A] (kg) [oz] [A]
(kg) [oz]
[B] [B]
Heat source unit model
+
Single
Table3-2-4-1. Value of
T otal capacity of connecting indoor units
Models
Models
Models
Models
Models
Models
Models
Models
Models
Models
Models
Models
MEES19K187
Liquid Piping Size
Total length of
ø15.88mm [5/8in]
+
(m) × 0.29 (kg/m) (m) × 0.2 (kg/m)
[A]
(ft) × 3.12 (oz/ft) (ft) × 2.16 (oz/ft)
(m) × 0.26 (kg/m) (m) × 0.18 (kg/m)
[B]
(ft) × 2.80 (oz/ft) (ft) × 1.94 (oz/ft)
Additional charge
Charged amount
P216 1.0 kg
P240 1.0 kg
~ 27
28 ~ 54
55 ~ 126
127 ~ 144
145 ~ 180
181 ~ 234
235 ~ 273
274 ~ 307
308 ~ 342
343 ~ 411
412 ~ 480
481 ~
Liquid Piping Size Liquid Piping Size
Total length of Total length of
ø12.7mm [1/2in] ø9.52mm [3/8in]
+ +
(m) × 0.12 (kg/m)
[A] [A]
(ft) × 1.30 (oz/ft)
(m) × 0.11 (kg/m)
[B] [B]
(ft) × 1.19 (oz/ft)
+
2.0 kg [71 oz]
2.5 kg [89 oz]
3.0 kg [106 oz]
3.5 kg [124 oz]
4.5 kg [160 oz]
5.0 kg [177 oz]
6.0 kg [212 oz]
8.0 kg [283 oz]
9.0 kg [318 oz]
10.0 kg [353 oz]
12.0 kg [424 oz]
14.0 kg [494 oz]
Liquid Piping Size
Total length of
ø6.35mm [1/4in]
+
(m) × 0.06 (kg/m) (m) × 0.024 (kg/m)
[A]
(ft) × 0.65 (oz/ft) (ft) × 0.26 (oz/ft)
(m) × 0.054 (kg/m) (m) × 0.021 (kg/m)
[B]
(ft) × 0.59 (oz/ft) (ft) × 0.23 (oz/ft)
333