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661Y1000 • F
MAINTENANCE
PERIODIC CHECKS BY THE USER
Check the pressure on the boiler pressure gauge: this should be between 0.5 and 1.5 bar.
Each month visually inspect the valves, connections and accessories in order to detect any
leaks or malfunction.
Periodically check the air vent valve located in the upper part of the tank to ensure that
itisnot leaking.
Check the DHW safety valves are in good working order.
In the event of a problem, please contact an engineer or your installer.
ANNUAL MAINTENANCE
The annual maintenance service, performed by an engineer, must include:
A check of the air vent valve:
The venting of air can lead to the need for adding water to the system.
Check the pressure on the boiler’s pressure gauge.
The manual activation of the DHW safety valve once a year.
This operation will lead to a discharge of hot water.
Before draining hot water through the safety valve, ensure that the outlet goes
directly to the drain to avoid any risk of burning and potential damage as a result.
The discharge pipe must be open to the outside.
If the safety unit drips periodically, this may be due to an expansion problem or clogging
ofthe valve.
Follow the circulator’s maintenance instructions.
Check that the valves are in good working order.
Drain valve
Recommendations
Drain the tank if it is not used in winter and is at risk from exposure to ice.
If the primary circuit water contains antifreeze, only the DHW tank must be drained.
Before draining the DHW, isolate the tank and lower the pressure of the primary
circuit to 1 bar, in order to protect the DHW tank from crushing.
If the heating circuit does not contain antifreeze, the heating circuit and domestic
water must be drained. Always drain the heating circuit before draining the DHW.
13


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