Instructions. V1.01
Page 14
JULY / 2013
Schedule
It is recommended that all key components of the heater should be inspected on a
regular basis, no greater than 12 monthly intervals, for the continued safe and efficient
operation of the unit. The inspection should be carried out by a competent person
(electrician or plumber) familiar with unvented systems and the components to be
inspected should include the following:
1.
Sacrificial anode. The condition of the anode should be checked regularly by an
authorised Zip service provider as part of the preventative maintenance program, to
ensure it’s effectiveness in protecting the vessel and element from corrosion.
To check the condition of the anode visually through the flange opening, first remove the
thermostat temperature probe and disconnect the electrical wires to the element before
unscrewing the element assembly and removing it.
To check the condition of the anode electrically, disconnect the wire between the anode
and the vessel and check that the current between anode and vessel exceeds 0.4mA.
Ensure that the wire is reconnected afterwards.
If the current between the anode and the vessel does not exceed 0.4mA it should be
checked visually and if badly corroded, it should be replaced.
To replace the anode, grasp it with long tongs or another suitable tool through the flange
opening and unscrew the securing nut whilst,at the same time supporting the anode
from inside the vessel.
2. Expansion relief valve. Check correct operation.
3.
T&P relief valve, if fitted. Check correct operation.
4.
Expansion vessel, if fitted. Check pressure-referring to label on the side of the vessel.
5.
Integral line strainer, if a pressure reducing valve is fitted. Inspect and clean as
necessary.
6. Check the discharge pipe is free of obstructions.
7. Check that all the electrical connections are tight.
De-Installation
• Switch off and disconnect the electrical supply.
• Close the mains water supply isolating valve.
• Disconnect the inlet and outlet connections on the heater.
• Remove the heater.
• Drain the unit through the hot water supply connection.