22 Legend and special notes
Grounding equipment conductor
Change-over contact of a relay (with relay with switching function)
Normally open (NO) contact of a relay
Normally closed (NC) contact of a relay (Relay reel powerless)
Relay protective circuit integrated at the plug board (Wound capacitor + resistor in series);
recommended with a contact load of > 0.5A for long relay service life and radio interference protection.
RC is activated if a wire bridge ≥ 0.75 mm² is used on terminal (KL) 4 on 5.
Tip: The option with / without RC is possible only with this specific relay, all the other relays are with RC
fixed wired.
The phase is fused by the fuse Si1 with 6.3A M at the plug board.
Power free contact.
Example WA3 ST22: This contact may be loaded with 230 V~ and an Imax of 5A.
Attention: the contact WA3 ST22 is not admitted for protective small tension! The necessary contact
distances and safety distances for protective requirements do not exist.
Terminal 2 L
(Terminal block)
Terminal block KL2 is fused by the Si1 with 6.3A M for possible additional functions, controllers, …
Terminal 3 PE
(Terminal block)
Terminal block KL3 PE (ground wire) for additional functions, controllers, …
Terminal 4 N
(Terminal block)
Terminal block KL4 N (neutral wire) for additional functions, controllers, …
Boiler sensor (KF) and sensor for the electronic STB (STB2000)
Two electrically separated measuring elements Pt2000 /-30 to 150°C in a conduit 6x50mm, silicone cable
2.5 m
Capacitor for the flue gas fan
AC-capacitor for speed reduction of the flue gas fan while service and cleaning
Flue gas sensor 1500
Measuring element Pt100 to +550°C / protective tube 6mm / Teflon cable 1.5m
Outside sensor with DCF77-Receiver, for automatic synchronization of date - time and summer
wintertime
Measuring element Pt2000 / -30 to +80°C / type of protection IP65
Outside sensor
Measuring element Pt2000 / -30 to +80°C / type of protection IP65
Strap-on sensor, incl. tightening strap and heat sink paste – universally useable
Measuring element Pt2000 to +120°C / type of protection IP65 / silicone cable 4.5m
Universal sensor
Measuring element Pt2000 to +150°C / protective tube 6x50mm / silicone cable 2.5m
Universal sensor-long
Measuring element Pt2000 to +150°C / protective tube 6x50mm / silicone cable 8.0m
Sensor-set for fuel calculation (BSB), pre-wired
Consisting of four sensors F5-1 to F5-4 / 4 times measuring elements Pt2000 up to +150°C
Protective tube 6x50mm / silicone cable / 8.0m from the clamping unit