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WaterMaster 25 - 35 - 45 - 70 - 85 - 120 : A1006482 - 664Y7300 • D
en
42
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STARTING UP
STARTING UP THE WATER HEATER
Set-up conditions
All connections made
Gas conversion carried out as required
Condensate trap full of water
Electrical power supply on
Gas supply open
Hydraulic circuit(s) full of water
Procedure
1. Check that there is no gas leak.
2. Push in the ON/OFF master switch ( ).
3. Check the gas pressure and allow the appliance to heat up for a few minutes
4. Check and adjust the burner according to local standards and regulations, refer to “Checking and
Adjusting the Burner” on page 42.
5. Set the Domestic Hot Water temperature to the required value using the control panel. Refer to
“Water heater Setup Guide on page 8 and to the Installers Handbook.
6. After 5 minutes of operation, check that the pressure is at 1.5 bar.
7. If required, top it up with water to get the required pressure.
Follow-on tasks
1. Close the primary circuit lling valve and disconnect the lling connection as required.
2. Check that there are no leaks.
3. Check that the ow rate in the appliance is sucient as follows :
Operate the appliance at maximum power
Once the temperatures are stable, read out the supply and return temperatures
Check that the dierence between the supply and return temperature is equal or less than 20k.
If the Delta T is higher than 20k, check the pump settings/specications.
CHECKING AND ADJUSTING THE BURNER
When the burner operates at full power, the CO2 rate must be within the limits mentioned in
the technical characteristics, (see “Combustion characteristics” on page 17).
Set-up conditions
Operating water heater
Procedure
1. Check if the ACVMAX parameters are set to meet the user's requirements (refer to Water heater
Setup Guide” on page 8), and change them if required.
2. Put the appliance to maximum power mode (Refer to the Installers Handbook).
3. Using a pressure tester, check that the dynamic gas pressure at the gas valve is at least 18 mbar.
4. Allow the appliance to heat for a few minutes until it reaches at least 60°C.
5. Measure the burner combustion by placing the flue gas analyzer probe in the measurement unit
port on the flue pipe and compare the CO and CO2 values displayed with those indicated in the
combustion characteristics table.
6. If the CO2 value differs by more than 0.3%, carry out the adjustment mentioned in the procedure
below.
7. Then put the appliance to the minimum power mode (Refer to the Installer's Handbook provided
with the appliance). Allow the appliance to stabilize for a few minutes.
8. Measure the CO2 level. It must be equal to the value at full power, or lower than that value by 0.5%
maximum. If there is a significant deviation, please contact ACV's maintenance department.
CO2 adjustment procedure
To adjust the CO2 rate, rotate the throttle screw (1) :
to the left (counterclockwise) to increase the CO2. rate.
to the right (clockwise) to decrease the CO2. rate.
The CO2 adjustment screw (1) of the WM 120 is a worm screw, whose rotation in a direction
causes the CO2 rate to cyclically increase to the maximum, then decrease to the minimum, then
increase again, and so on. To adjust, monitor the value change on the analyzer to determine
whether the rotation in the selected direction causes the CO2 value to increase or decrease.
Follow-on tasks
None
1
WaterMaster® 25 - 35 - 45 - 70 - 85 WaterMaster® 120
44


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