Commissioning; First Time Start Up; Setting The Bleed-Off Rate - Munters WDP Installation Manual

4. Commissioning

4.1 First time start up

• After the gutter, pads and plumbing kit have been installed, connect the fresh water supply to the float
valve in the tank and the pump to the electrical supply. The electrical connections should be done by a
qualified electrician according to local laws and regulations.
• Remove any visible material from the tank and the gutter.
• Open the water supply to the tank.
• Remove the drain pipes from the tank.
• Once the tank has filled to the float valve, the pump can be started.
• Let the system run for at least 15 minutes with the drain pipes still not connected to the tank. This will
clean debris that might have been left in the system during the installation process.
• Make a note of any leaks that might have occurred.
• Switch the pump off.
• Let all the water drain from the drain pipes before they are replaced into the tank.
• Unscrew the cap of the filter and clean the filament if necessary. Replace both the filament and the cap
• If there were any leaks, dry the places where the leaks occurred and re-seal.
• If necessary, start the system again an check again for any leaks.

4.2 Setting the bleed-off rate

The bleed-off rate is the water flow that needs to be constantly drained off to keep the mineral concentration
in the water to an optimal level. Too little bleed-off means too much scaling and clogging, resulting in frequent
pad change. Too much bleed-off results in high water costs. It is therefore important to calculate the optimal
bleed-off rate to get a long lasting pad with high performance.
As a good starting value, use 0.2l/minute/running meter of gutter. If scaling becomes apparent, increase the
amount of bleed-off.
To adjust the bleed-off, follow the steps listed below:
• place a 10l bucket underneath the outlet of the bleed-off;
• start the pump and allow it to run until the return water starts flowing into the tank;
• open the bleed-off valve and start measuring the time and continue to measure the time until the bucket
is filled;
• use the table below as a quick guideline of how long it should take to fill the bucket with water. Adjust
the opening of the valve more or less according to how long it has taken to fill the bucket. Once the right
opening size for the valve is determined, keep the valve at this position to ensure constant bleed-off.
As an alternative to the table, the following formula can be used to calculate the filling time for any size
container.
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