Minimum Water Content In The System - Mitsubishi Electric MEHP-iB-G07 Installations, Bedienungs Und Wartungsanleitungen

8 LINKS AND CONNECTIONS

Minimum water content in the system

MEHP-iB-G07 07V
Litres 36
Risk of freezing
In the case of external air temperatures close to 0°C, the risk of the unit freezing must be prevented.
We recommend to:
• use antifreeze in the required percentages.
• protect pipes with heating cables, which must be kept away from devices, sensors and materials that may be damaged or whose operation could be
impaired (for example, temperature probes, plastic components and power cables).
• drain the system and check that there is no water pooling at the lowest points of the system or closed taps where water can be trapped.
It is recommended to use non-toxic antifreeze for food use. The antifreeze used must be inhibited, non-corrosive, and compatible with the components
of the hydraulic circuit.
Ethylene glycol solutions
Solutions of water and ethylene glycol used as heat transfer
fluid instead of water cause a decrease in unit performance.
Multiply the performance data by the values given in the
table below.
For heat pumps a suitable charging/reintegration
system must be provided that connects on the return line
and a drain cock at the lowest part of the system.
Systems with antifreeze or special legislative provisions
require the use of water disconnectors.
Installation, use and maintenance manual - Original instructions
09V 11V 15V
60 75 71
Table 14: minimum water content in the system.
When managing antifreeze solutions, please make sure to respect the local regulations.
Please refer to the data book for specific information about the type of glycole and minimum and maximum
concentration.
15Y 18Y 23Y
74 80 113
WARNING
NOTICE
Freezing temperature (°C)
0 -5
percentage of ethylene glycol by weight
0 12%
cPf 1 0.985
cQ 1 1.02
cdp 1 1.07
cPf: cooling capacity correction factor
cQ: flow rate correction factor
cdp: pressure drop correction factor
27Y 35Y 40Y
181 187 193
-10 -15 -20
20% 28% 35% 40%
0.98 0.974 0.97 0.965
1.04 1.075 1.11 1.14
1.11 1.18 1.22 1.24
EN
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