Technical data

Manual - Solar hot water systems56
7 Inspection and maintenance
7 Inspection and maintenance
To ensure reliability and long service life regular
inspections and maintenance work have to be performed
on the solar system by a specialist.
As the owner, never try to carry out maintenance work
on your system yourself. Use an approved qualified
servicing company for this work. We recommend making
a maintenance agreement with an approved qualified
servicing company.
Maintenance Maintenance interval
Solar circuit
Check the frost protection of the solar fluid (use the Vaillant 302 064 solar fluid tester) Annually
Check the system pressure Annually
Check the pH value of the solar fluid (with litmus paper, pH > 7.5) Annually
Check the solar pump function Annually
Bleed the system Annually
Check the circulating volume in the solar circuit Annually
Check the hot water thermostat mixer function Annually
Refill with solar fluid if necessary Annually
Check the quantity of blow-off liquid Annually
Release the return flow preventer Annually
Check the charge pressure of the expansion vessel Annually
Collector
Visual inspection of the collector, collector fastenings and connections Annually
Check whether the brackets and collector components are clean and fitted properly Annually
Check the pipe insulation for damage Annually
Solar control
Check the pump function (on/off, automatic) Annually
Check the sensor temperature display Annually
Secondary return/reheating
Check the circulation pump Annually
Check the timer/time programme settings Annually
Reheating: does it deliver the desired deactivation temperature? Annually
Solar cylinder
Bleed the heat exchanger if necessary Annually
Check the connections for leaks Annually
Check the temperature and pressure relief valve Annually
Checking the expansion relief valve Annually
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.
The operational reliability of the solar system may be
impaired, resulting in damge to property or personal
injury, if the inspections and maintenance work are not
carried out.
The main maintenance work on the solar system and the
corresponding maintenance intervals are specified in the
following table.
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.
h
Note!
Only use original spare parts from Vaillant Ltd.
for the replacement of parts.