Stiebel Eltron ZSE 5 Utilisation Et Installation page 19

Checking the output
 The ED LED indicates when the output is switched on. A
phase tester at terminals A1, A2 must light up in the same
sequence as the LED.
Note: This check is only possible if:
 the LED ED is not permanently switched off (duty cycle
0%,
 the control line is connected and not interrupted by a 4-
pole thermomechanical charge controller.
Checking the load
 Before switching on the mains voltage, measure the total
resistance of the control resistors connected to control
output A1 and A2. For this purpose, the group control unit
must be removed from the plug-in socket. The control re-
sistors of the storage heaters may be temporarily swit-
ched off by 4-pole thermomechanical charge controllers
via a fourth switching contact. Therefore measure the to-
tal resistance of all control resistors only after a waiting
period of approx. 10 minutes.
 The measured resistance must not be less than 330 .
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INSTALLATION AND COMMISSIONING
ZSE 5 | 5