Viessmann Vitocrossal 200 CM2 400 Service Instructions Manual page 69

Vitocrossal 200, CM2 400, 500, 620 and 620 TX Service
Maintenance Schedule
Frequency Performed by
Annually Owner /
Operator
Heating
Technician
Periodically Heating
Technician
(continued)
Service

Ensure service work/test is conducted at least annually by qualified personnel,
and that any deficiencies are corrected immediately.
Test functionality of safety high limits.
Test and establish proper chemical makeup of system water.
Check flue pipe condition, chimney connection and chimney itself.
Check pressure relief valve and system pressure, and verify proper operation.
Check heating pipe joints, valves, air vents, etc. System leaks must be corrected
immediately to avoid further defects.
The cause of defect must also be determined in order to avoid further problems.
Check for proper combustion air supply and ventilation to boiler / mechanical room.
Test high limits by dialing lower settings, then switching burner on/off to verify
function. Test low water cut-off, check and verify proper function according to
manufacturer's instructions.
Check requirements for maintenance or lubrication of the circulation pumps
according to manufacturer's instructions.
Check for gas-tight connection of gas piping, unions, gas valve and manifold.
Check proper ignition of the burner.
Combustion test must be performed by a qualified heating technician.
Ensure functionality of low water cut-offs, including flushing of float types (if used)
during operation. Refer to the manufacturer's instructions.
Inspect low- and/or high pressure gas switch (if used).
Inspect main burner flame and follow the instruction manual for detailed service
and maintenance guidelines.
All boilers and the boiler room must be kept free of high dust levels, high humidity,
aggressive vapors and/or chemicals containing chlorine.
Ensure proper boiler room ventilation.
Valves, fittings and pipes not pressure tight must be repaired.
Combustion chamber door, clean-out opening covers, and flanges may need to be
retightened and resealed. Do not over tighten.
Inspection and Maintenance
69