Mitsubishi Electric PUHY-M200YNW-A1 Service Handbook page 32

[1-4 Water piping ]
3. Correction by antifreeze-liquid concentration
In HYBRID CITY MULTI system, antifreeze-liquid should be used to prevent the system from freezing. Refer to the following
graphs for the capacity correction by antifreeze-liquid. Refer to (1) for antifreeze-liquid concentration, (2) and (3) for capacity
correction by antifreeze-liquid concentration.
When adding antifreeze-liquid, be sure to perform the process in accordance with the relevant local laws and regulations.
(1) Antifreeze-liquid concentration
Use propylene glycol solution for antifreeze.
Refer to the following graph to estimate the antifreeze-liquid concentration required for freeze protection.
0
-5
-10
-15
-20
-25
-30
0 10 20
Antifreeze-liquid concentration [wt%]
(2) Capacity correction by antifreeze-liquid concentration (cooling)
1
0.99
0.98
0.97
0.96
0.95
0.94
0.93
0.92
0.91
0.9
0 10 20
Antifreeze-liquid concentration [wt%]
(3) Capacity correction by antifreeze-liquid concentration (heating)
1
0.99
0.98
0.97
0.96
0.95
0.94
0.93
0.92
0.91
0.9
0 10 20
Antifreeze-liquid concentration [wt%]
BS_01_G
30 40 50 60 70
30 40 50
30 40 50
1
0.99
0.98
0.97
0.96
0.95
0.94
0.93
0.92
0.91
0.9
0 10 20
Antifreeze-liquid concentration [wt%]
1.2
1.18
1.16
1.14
1.12
1.1
1.08
1.06
1.04
1.02
1
0 10 20
Antifreeze-liquid concentration [wt%]
30 40 50
30 40 50
21
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