elco Thision EVO WH 250-120, Operation And Installation Manual

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Maintenance
27
Water pressure and quality
Check if the water pressure and quality
meet the requirements. Consult the
chapter “commissioning: water and
hydraulic system” for more detailed
information.
Combustion analysis
Check the combustion at full load and
minumum load, correct the settings if
necessary. An additional reference
check at 50% load is recommended.
Consult the chapter “commissioning:
combustion analysis” for more detailed
information.
Gas pressure
Check the dynamic pressure of the gas
supply to the boiler, when the water
heater is running at full load.
Gas tightness check
Check the tightness of all sealed con-
nections with an approved soap or
electronic analyzer, for example:
Test points;
Bolt connections;
Gaskets of mixing system, etc.
Safety devices
Check the functionality and the settings
of all safety devices connected. Consult
the chapter “commissioning: Check
functionality of safety devices” for more
detailed information.
It is possible to clean out the cylinder using
fresh mains cold water if so desired. To
carry out this operation isolate and disconnect
all water supplies and ensure all electrical
supplies are isolated. Run a drain hose from
the drain valve to an operating drain, then
connect a controlled mains water supply to the
unit, drain the unit fully and then slowly
supply water to the unit at the rate of drainage.
carry on at this rate until the water running
out of the bottom of the cylinder runs clear, then
carry out two full fills and drains.
Reconnect and re-commission.
Draining and cleaning the cylinder