Electrical Connection Of The Flame Detectors; Commissioning Notes; Standards And Certificates - Siemens LEC1 Series Manual

Electrical connection of the flame detectors

Commissioning notes

Standards and certificates

4/17
Building Technologies
HVAC Products
It is important to achieve practically disturbance- and loss-free signal transmission:
•
Never run the detector cable together with other cables
– Line capacitance reduces the magnitude of the flame signal
– Use a separate cable
•
Observe the maximum permissible lengths of the detector cables (refer to «Techni-
cal data» at current flame safeguards
•
The ionization probe is not protected against electric shock hazard
•
Locate the ignition electrode and ionization probe such that the ignition spark can-
not arc over to the ionization probe (risk of electrical overloads) and a override of
ionization supervision via ignition spark must be avoided
•
Insulation resistance
– Must be a minimum of 50 MΩ between ionization probe and ground
– Soiled detector holders reduce the insulation resistance, thus supporting
creepage currents
•
Earth the burner in compliance with the relevant regulations; earthing the boiler
alone does not suffice
•
Continuous display of the program sequence in the viewing window:
It is also possible to program the unit by means of a changeover link (UL3) in a way
that the programming mechanism does not stop in case of lockout, but that it runs
to the end of the program. The only component that receives power during that pe-
riod of time is the fan for postpurging (connected to terminal 17)
•
The motor of the programming mechanism can be switched off (simplifies burner
adjustments)
•
The camshaft can be rotated manually
•
For setting instructions, refer to «Adjustment facilities on the unit»
•
When commissioning the plant or when carrying out maintenance work, make the
following checks:
Safety check
a) Burner startup with flame detector darkened
b) Burner startup with flame detector exposed to
extraneous light
c) Burner operation with simulated loss of flame
d) Burner startup with open-circuit of air pressure
switch (not with atmospheric burners)
e) Burner operation with simulated air pressure
failure (not with atmospheric burners)
Conformity to ECC directives
- Electromagnetic compatibility EMC (immunity)
- Directive for gas appliances
– Low-voltage directive
ISO 9001: 2000 ISO 14001: 2004
Cert. 00739 Cert. 38233
•
Identification code to EN298
Anticipated response
Lockout at the end of
«TSA»
Lockout after no more than
40 seconds
Immediate lockout
Lockout at the end of the
specified time «t10»
Immediate lockout
89 / 336 / EEC
90 / 396 / EEC
73 / 23 / EEC
F B L L B N
CC1N7761en
19.02.2007