31
9.5 Drawing Number Legend
Drawing Number
Part Description
16
Combustion Fan
32
Boiler Central Heating Shunt Pump
44
Gas Valve
72
Room Thermostat 1
st
Zone
72b
Room Thermostat 2
nd
Zone
81
Ignition Electrode
82
Detection Electrode
98
On / Off Switch
114
Water Pressure Switch
130
DHW Primary Circulating Pump
138
Outside Sensor
139
Remote Control 1
st
Zone
155
DHW Tank Probe
186
Return Sensor
188
Ignition & Ionisation Electrode
191
Flue Gas Temperature Sensor
278
Double Sensor (Safety & Heating)
298
Cascade Flow Temperature Sensor
299
0-10v DC Control
300
Burner Burning Indication (Volt Free Output)
301
Fault Indication (Volt Free Output)
302
Remote Reset Input (230v)
306
Heating Circulating Pump 1
st
Zone
307
Heating Circulating Pump 2
nd
Zone
348
3 Way Valve
357
Fault Indication (230v)
361
Cascade Connection - Emitter
362
Cascade Connection - Receiver
Room Thermostat Connections (72 & 72b)
The room thermostat connecters are
volt free connections
. Connecting 230v to these terminals will damage the main PCB
boards:
•
72
– Room Thermostat = Terminals 21 & 22.
•
72b
– Second Room Thermostat = Terminals 27 & 28.
Advisory: When connecting a remote timer control or a timer switch, do not take the power supply for these devices from their
cut out contacts.Their power supply must be taken with a direct connection from the mains or batteries.
Outdoor Sensor (138)
Connect the outdoor sensor to terminals 23 & 24 - The maximum length of cable is 50 metres, a common two wire core cable
can be used.
The outdoor sensor should be connected to a north wall of the building, not near windows, doors, vents, flues or any other
heat sources that could affect an accurate reading.
DHW Tank Probe (155)
Connect the outdoor sensor to terminals 29 & 30 - The maximum length of cable is 50 metres, a common two wire core cable
can be used.
Summary of Contents for S-FX 125
Page 2: ......
Page 11: ...11 4 BOILER DIMENSIONS 4 1 S FX 70 4 2 S FX 125 ...
Page 12: ...12 4 3 S FX 220 4 4 S FX 320 ...
Page 28: ...28 9 4 Electrical Schematics S FX 70 ...
Page 29: ...29 S FX 125 ...
Page 30: ...30 S FX 220 320 ...
Page 67: ...67 BLANK PAGE ...