Vaillant Solar System and auroSTOR unvented solar cylinder Start-Up, Maintenance And Troubleshooting Manual page 54

Maintenance
Solar circuit
Check the frost protection of the solar fluid (use the Vaillant 302 064 solar fluid tester)
Check the system pressure
Check the pH value of the solar fluid (with litmus paper, pH > 7.5)
Check the solar pump function
Bleed the system
Check the circulating volume in the solar circuit
Check the hot water thermostat mixer function
Refill with solar fluid if necessary
Check the quantity of blow-off liquid
Release the return flow preventer
Check the charge pressure of the expansion vessel
Collector
Visual inspection of the collector, collector fastenings and connections
Check whether the brackets and collector components are clean and fitted properly
Check the pipe insulation for damage
Solar control
Check the pump function (on/off, automatic)
Check the sensor temperature display
Secondary return/reheating
Check the circulation pump
Check the timer/time programme settings
Reheating: does it deliver the desired deactivation temperature?
Solar cylinder
Bleed the heat exchanger if necessary
Check the connections for leaks
Check the temperature and pressure relief valve
Checking the expansion relief valve
Table 7.1 Maintenance checklist
Checking the temperature and pressure relief valve
and expansion relief valve
• Actuate each valve manually by turning the valve cap
and check whether the water flows unhindered to the
discharge point via the tundish. Make sure both valves
fit properly in idle position.
Checking the charge pressure of the expansion vessel
• Block the water supply and open the nearest hot water
tap to reduce the pressure from the secondary water
system.
• Check the pressure of the expansion vessel at the
measurement point with a pressure gauge. If the
pressure is below 3.0 bar, increase it with an
appropriate air pressure pump.
• Perform the maintenance part of the start-up protocol.
Note!
h
Only use original spare parts from Vaillant Ltd.
for the replacement of parts.
Manual - Solar hot water systems 0020009607_02
Inspection and maintenance 7
Maintenance interval
Annually
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