Technical data

53
10.1 Electrical diagram HE26
Connector X4
24V=
1-3 Cascade control contacts (not available on standard controller)
4-5 External economy switch (for hot water)
6-7 On/off room thermostat 0,1A 24V= and/or Frost thermostat.
6-7-9 Power supply clock thermostat (6= positive, 7=switched live, 9= negative) 24V= max.3VA
8-9 Outdoor sensor 12kOhm/25°C
9-10 Hot water cylinder thermostat (normally closed connections). If used remove link 9-10
11-12 OpenTherm modulating thermostat (When in use 6-7 must be open)
Connector X2
230V~
1 230 switched live from room thermostat
2-4 Mains (2=Live, 4=Neutral)
7-8 CH pump (8=Live, 7=Neutral)
3-5-6
Valve underfloor heating (3=Live(brown), 5=Switch (black), 6=Neutral(blue)).
e.g. VC4013 Honeywell 230V~
3-5-6
Three way valve (3=Live (brown), 5=Switch live (black), 6=Neutral(blue)),
(e.g. VC4013 Honeywell 230V~)
Connector X5 PC interface
Notes
1. F: 5x20mm anti-surge fuse, 2A.
2. 230Vac stat circuit: Available for room stat, etc. The switched live (X2/1) can also be used for S plan or Y plan
circuits (note that the 230Vac live to the Wiring Centre must come from the same fused spur as the 230Vac supply
to the boiler).
3. OpenTherm: When using an OpenTherm thermostat, 6-7 must not be used.