ACV WaterMaster 45 - Starting Up the Water Heater; Checking and Adjusting the Burner

WaterMaster 25 - 35 - 45 - 70 - 85 - 120 : A1006482 - 664Y7300 • D
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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 Installer’s 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 CO
2
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 Installer’s 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 CO
2
values displayed with those indicated in the
combustion characteristics table.
6. If the CO
2
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 CO
2
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.
CO
2
adjustment procedure
To adjust the CO
2
rate, rotate the throttle screw (1) :
• to the left (counterclockwise) to increase the CO
2.
rate.
• to the right (clockwise) to decrease the CO
2.
rate.
The CO
2
adjustment screw (1) of the WM 120 is a worm screw, whose rotation in a direction
causes the CO
2
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 CO
2
value to increase or decrease.
Follow-on tasks
None
1
WaterMaster® 25 - 35 - 45 - 70 - 85 WaterMaster® 120