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INSTALLATION
Water heater shutdown
18 | DHX Trend & DHX Plus www.stiebel-eltron-usa.com
12.2.1 Initial AE3 safety switch activation
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f Engage the AE3 safety switch by firmly pressing the white reset
button until it clicks and fully locks in place (the water heater is
delivered with the safety switch disengaged).
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f Connect the programming unit connecting cable plug to the
PCB.
Note
It is essential to plug the connecting cable from the pro-
gramming unit into the PCB before switching on the power.
Otherwise, the programming unit will not function.
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f Hook the water heater cover into the water heater back panel
at the top rear. Pivot the cover downwards. Check that the cover
is securely seated at both top and bottom.
f Secure the cover with the screw.
f Remove the protective film from the front panel.
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f Switch on the power supply.
f Ensure the programming unit is functioning correctly.
12.2.2 Water heater handover
f Explain the water heater functions to users, and familiarize
them with how it works.
f Make the user aware of potential dangers, especially the risk of
scalding.
f Hand over the instructions.
12.3 Operation with preheated water
The maximum inlet temperature may be limited by installing a
central thermostatic valve. Use the thermostatic valve for central
premixing, for example when operating an tankless water heater
with preheated water. For use in shower operation, the valve must
be set to a maximum of 131 °F (55 °C).
12.4 Recommissioning
!
Material losses
To ensure that the Direct Coil
™
heating system is not dam-
aged following an interruption to the water supply, the
water heater must be restarted by taking the following
steps:
f Disconnect the water heater from the power supply by
turning the connected circuit breaker.
f Open and close all connected draw-off valves at least 5
times, for at least 3 minutes total, until all air has been
purged from the pipework and the water heater.
f Switch the power back ON.
13. Water heater shutdown
f Turn the connected circuit breaker too the “Off” position.
f Drain the water heater (See section 15.1, “Draining the water
heater,” pg. 19").
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