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2.4.2 MVM valve
Definition
MVM is used as a general term for a motor valve.
Shielding
Shield the valve motor from direct sunlight. Due to heat emission, the valve motor must
not be encapsulated (maximum ambient temperature: 50°C).
Insulating the valveTo ensure normal operation at ambient temperatures below 0°C, it is very important that
the valve section is insulated according to current standards/procedures.
MVM-OD, valve for
IIf MVM-OD used, then shielding is part of the delivery - if the valve has a K
outdoor fitting
below 6.3.
Regulating
Optimal regulation is achieved when the differential pressure is between 5–20 kPa.
properties
If the differential pressure is higher than 20 kPa, the installation of a pressure difference
regulator is recommended.
2.4.3 Cold water supply
The cold water supply must be constant.
2.4.4
Operation of circulating pump
The circulation pump is operated by the EXact control system, as described below:
1. When no cooling is required, the MVM valve operates at 0%.
2. The circulation pump runs for another 5 minutes and then stops.
3. EXact starts the 24-hour timer.
4. When the 24 hours have passed, the circulation pump runs for 5 minutes.
5. The exercise cycle is repeated once a day until a cooling requirement
occurs.
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