HAMWORTHY HEATING LTD
13
WEYMOUTH
500001112/C
9.0 SERVICING SCHEDULE
The following is a recommended servicing schedule for the Weymouth unit and expansion vessel. If remedial
action is required, refer to section 10: SERVICING AND REPLACEMENT OF COMPONENTS. If in doubt consult
Hamworthy Heating.
9.1
6 Monthly
1) Check the expansion vessel charge pressure, as described in section 7.4. A significant drop in charge
pressure could be due to a faulty vessel diaphragm; replacement of diaphragm should be considered. See
section 10.9.
2) Briefly run the pump to check for rotor seizure. This could occur if the pump is not run for extended periods.
This can be accomplished by slightly opening the expansion vessel drain valve to initiate a leak.
Note!
Ensure that the drain valve is closed after this operation.
9.2 12 Monthly
1) Check the ball float valve diaphragm seat for integrity and replace if necessary. Also check the plastic float for
soundness.
2) Check the expansion vessel for signs of external corrosion. If any deterioration is observed then it is
recommended that the frequency of inspection be increased.
3) Check the operation of the safety circuits if utilised on the Advanced unit.
9.3 4 Yearly
1) Remove the expansion vessel diaphragm as described in section 10.9 and inspect for wear/ageing.
Inspect the internal surface of the vessel for corrosion.
Significant corrosion can lead to failure of the vessel; replacement of the entire vessel should be considered.
If necessary replace the diaphragm as described in section 10.9.
