Advertisement
Refrigerant charge for VRF equipment is critical to obtain optimum performance.
This pocket guide will take you through the step by step guidance in calculating the correct refrigerant
1) The outdoor equipment, quantity and size, (Compensation/Correction/Trim Charge).
(Units have to be in the same system i.e. joined by pipe and cable with another unit,forming a modularized system)
Different sizes and combinations of outdoor units, have a specific Compensation/Correction/Trim charge per combination
Indoor Unit Capacity Rank
Capacity Code
(Equivalent to HP)
Corrective Amount of
Refrigerant (kg)
Indoor Unit Capacity Rank
Indoor Unit Capacity Rank
Capacity Code (Equivalent to HP)
Corrective Amount of Refrigerant (kg)
Capacity Code (Equivalent to HP)
Corrective Amount of Refrigerant (kg)
Total up the hp of all the indoor units on the system multiply by the hp of the outdoor units, result is % diversity.
Example 3 x MMK-UP0181HP-E ( 2hp high wall units) = 6hp, connected to 1 x MMY-MUP1001HT8P-E (10hp)
Pipe dia. Liquid Line
Additional Refrigerant Amount per m
With the above information it is easy to calculate the additional refrigerant charge for each system.
Cool Designs Ltd makes every effort to ensure that the information provided within this publication is correct and error free, however we cannot guarantee that it is free of inaccuracies,
Cool Designs Ltd makes every effort to ensure that the information provided within this publication is correct and error free, however we cannot guarantee that it is free of inaccuracies,
errors or omissions. Users should seek to clarify this information for themselves prior to basing any decisions upon such information.
errors or omissions. Users should seek to clarify this information for themselves prior to basing any decisions upon such information.
charge for your SMMSu system.
Working out the correct refrigerant charge requires;
2) The quantity and size of indoor units installed.
(Qty and size of Standard indoor units, Air to Air Heat Exchangers, Fresh Air Units)
003
005
007
008
009
010
0.3
0.6
0.8
0.9
1
0.2
Corrective amount of refrigerant for High Efficiency 4-way Blow Cassette - ONLY
009
012
1
1.25
0.2
Corrective Amount of Refrigerant for Hot Water Module
Corrective Amount of Refrigerant for DX Coil Interface
8
10
16
1.4
1.8
2.9
3) Correction for Diversity
6 x 10 = 60% Diversity =
Corrective Amount of Refrigerant According to the Outoor Unit Diversity
Diversity D (%)
50% < D < 60%
60% < D < 70%
70% < D < 80%
80% < D < 90%
90% < D < 95%
98% < D
4) The lengths and sizes of the liquid line installed.
(Linear length only, i.e. straight pipes only, do not count bends or fittings.)
inch
kg/m
012
014
015
018
020
1.1
1.25
1.5
1.7
2
2.25
0.4
fig 7
015
018
024
1.7
2
2.5
fig 8
024
2.5
fig 9
18
20
32
3.2
3.6
5.8
fig 10
-2.0kg
Corrective Amount of Refrigerant (kg)
-2.5
-2.0
-1.5
-1.0
-0.5
0
fig 11
1/4"
3/8"
1/2"
0.025
0.055
0.105
fig 12
-4-
024
027
030
036
048
2.5
3
3.2
4
5
0.6
027
030
036
3
3.2
4
0.6
048
5
0.2
36
40
48
6.5
7.2
8.6
5/8"
3/4"
7/8"
0.160
0.250
0.370
056
072
096
6
8
10
1.0
048
056
5
6
54
60
9.7
10.8
1"
0.470
Advertisement
