Pressure Gauge - AOSmith MVI 103 Notice D'installation Et D'utilisation

7.5.3
7.5.4
7.5.5
7.5.6
7.5.7
7.5.8
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MVI pompstation / MVI pump station / station de pompage MVI
pH-value glycol
Check the pH of the glycol by taking a small amount from the system. If the measured pH
value of the glycol is below the 7,0 replacing of the glycol is necessary to maintain a good
heat transfer in the system. The original value of the glycol mixture supplied by your supplier
is approximately 8,0.
Fill the system as described in chapter 4.1.
Note:
Always replace the complete volume of the system when the pH is too low.
Do not mix old and new glycol.
Flow
Check if the flow through the system is still in accordance with the value stated in chapter
9.3, based on the number of collectors. If not, correct this using the instruction from chapter
4.2.1.
Fluid level
The fluid level has to be checked to make sure no air is being transferred through the pump.
If additional filling of the installation is needed; always use identical solar fluid as used
originally. Mixing different fluids can result in improper functioning and damaging of the
installation. Fill the system as described in chapter 4.1.

Pressure gauge

Test the operation of both the pressure gauges, located at (J) and at the security group (E).
The values on the display should be equal and in accordance to the value stated in chapter
9.4. When the pump is being activated, the value should change.
Overflowvalve
Test the operation of the overflow valve of the solar security group (E). The glycol mixture
should spurt out when opening the lever.
Check expansion vessel
The expansion vessel must be checked yearly for leaks and proper pre-charge value. See
chapter 9.4 for the required pre-charge values.