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Building Technologies Division User Manual LMS14... CC1U7471en
3 Mounting and installation 28.01.2015
3.1.2 Electrical connection on 2-phase systems
When operating the LMS14 on 2-phase systems, the following points must be observed:
You must adhere to the mains voltage and mains frequency values specified in the
technical data
The components you connect to the LMS14 (gas valve, igniter, etc.) must be
suitable for 2-phase operation
Make sure to connect the phases correctly.
There is a phase angle of 120° between the phases. Therefore, the sequence in
which the phases are connected does make a difference.
Connecting them incorrectly can result in an excessively low ionization current and
lead to "loss of flame" faults.
To ensure they are connected correctly, we recommend following the procedure
described below:
1. The characteristic ionization current for a particular type of boiler must be
determined by the OEM in 1-phase operation and documented in the Service
Manual.
This value can be read by referring to the Ionization current (8329) line in the
Diagnostics heat source menu.
2. When commissioning a boiler on a 1-phase system, it is essential to check the
Ionization current (8329).
If it is the same as or higher than the value in the Service Manual, the phases
have been connected correctly.
If the Ionization current (8329) is lower than the value in the Service Manual,
the phases have been connected incorrectly and must be swapped round.
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