Glowworm Lighting 250 I - Manual (Page 19)

9
4 Inspection and Maintenance
4.1 Checking the temperature / 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.
4.2 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.
NOTE: Only use original spare parts from Glow-worm for the
replacement of parts.
4.3 Maintenance Checklist
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.