9 Servicing

9.1 A Tectite disconnecting tool is required for removal and servicing of certain components.

9.2 Please ensure that the mains water and mains electrical supply are isolated prior to commencing and maintenance or replacement of components.

9.3 Routing Maintenance:

9.3.1 Operate appliance and check for correct function.

9.3.2 Clean filter in Y-Pattern Strainer.

9.3.3 Clean filters in Thermostatic Blending Valve (if fitted).

9.3.4 Check operation of Ball Valve.

9.3.5 Check water level in F&E Tank - ensure a minimum of 35mm below Overflow.

9.3.6 Check that immersion heater thermostats are set to 80°C.

9.3.7 Check for air in Heat Bank Thermal Store Pump

9.3.7.1 Check that immersion heater thermostats are set back to 80°C and covers replaced securely upon completion.

9.3.8 Check presence of label indicating addition of scale inhibitor. Check stored water for correct dosage of inhibitor. Details may be obtained from supplier of inhibitor

9.3.9 Check anti-evaporation sheet fitted in F&E Tank, and that it is not obstructed.

9.3.10 Check lid on F&E Tank is firmly secured, and as air tight as possible.

9.3.11 Check that isolating valve on vent pipe is closed.

9.4 Check the operation of the Primary System as follows.

9.4.1 Check operation of programmer.

9.4.2 Check time settings.

9.4.3 Check heating and hot water, on and off times. Hot water should typically be set for 2 hours before demand periods.

9.4.4 Follow any check listed in the programmer's servicing instructions.

9.4.5 Turn both heating and hot water OFF using the programmer.

9.4.6 Check that the primary pump is off. There may be a delay caused by a pump overrun.

9.4.7 Take a note of the cylinder thermostat setting.

9.4.8 Adjust the cylinder thermostat stat to MINIMUM and turn hot water ON using the programmer.

9.4.9 Check the primary pump is OFF.

9.4.10 Turn up the cylinder stat until it switches. The primary pump should switch on as well as the boiler.

9.4.11 Turn the room stat up to maximum and turn the central heating ON using the programmer.

9.4.12 Check the mid-position valve swings across to mid-position.

9.4.13 Turn the cylinder thermostat to MINIMUM.

9.4.14 Check the mid-position valve swings completely across to heating.

9.4.15 Reset the cylinder stat to the required setting, typically 75°C.

9.4.16 Reset the programmer to original settings.

9.4.17 Reset the room stat as required.