Specifications

TM013 Vulcan Electric Service Instructions REV: D
D.O.I.: 05/09
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The new design cylinder element barrels do not have an earthing tab and require the earth
bond to be connected to the earthing tab on the thermostat clamp (refer to fig. 4).
When installing an early or new type element on a cylinder barrel that has
an earth tab, this earth tab must be used (refer to fig.3).
When installing an early or new type element on a new type cylinder
barrel that does not have an earth tab, the earth tab on the thermostat
clamp must be used (refer to 4).
Fig.3.
Cylinder barrel Earth tab
Fig.4.
Thermostat clamp Earth tab
Refer also to Technical Bulletins TB05 019 and TB05 020
Thermostat changes
From August 14 2007, the Robertshaw EWT series thermostats have been replaced by
the Robertshaw ST series thermostats. This change applies to all electric water heaters.
It should be noted that although ST series thermostat is a direct replacement for the EWT
series thermostat, the terminal connections and wiring arrangement is different. Therefore;
Whenever an EWT series thermostat is replaced with a ST series thermostat
as a spare part, each water heater will require rewiring at the thermostat.
Refer to wiring diagrams in this service instruction for wiring arrangements
utilising the new ST series thermostat.
ST12 Replaces EWT1
ST22 Replaces EWT2