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7.3 Phase sensitivity
The S-CB boilers are not phase (polarity) sensitive.
7.4 Fuses
Main supply fuse should be 5 Amp, slow blow (Not Strebel supply).
On the PCB. Board, there are 3 auto fuses and 1 mains fuse.
Fuse nr.
Use
Value
F1 Ignition
Automatic
re-set
F2 Electronics
Automatic
re-set
F3 Electronics
Automatic
re-set
230 VAC
Mains
3.15 Amp
Maximum electrical load for the boiler.
a.
For the boiler types S CB60 to S CB120: The total load connected for external diverter valves and or
pumps should not exceed a maximum of 345 Watt (1.45A). Any external pump should be connected
to the boiler via a relay. When the total of the connected pumps and valves exceeds 345 Watt, these
items must be controlled through relays.
b.
Boiler types S CB150 + S CB180: The total load connected for external diverter valves and or
pumps should not exceed a maximum of 255 Watt (1.1A). Any external pump should be connected
to the boiler via a relay. When the total of the connected pumps and valves exceeds 255 Watt, these
items must be controlled through relays.
7.5 Sample Cascade Electrical Layout
All items are not used on every installation.
Notes:
a.
When using 0 – 10 Volt, no room thermostat can be connected
b.
When using 0 – 10 Volt, no bridge is needed for the 13 and 14 connection
c.
When using 0 – 10 Volt, no outside sensor can be connected
d.
When using 0 – 10 Volt, a flow sensor is required on the Heating Flow.
FS
P2
See Drawings in the installation operating and maintenance instructions
pages 6 and 20 for full cascade hydraulic layout detail
0 to 10 v
see notes
below
North Wall
P1 = Inbuilt Boiler pump
P2 = Heating pump
FS = Flow sensor
OS = Outside sensor
RT = Room thermostat
See “ a “
NOTE: See Quotation
for equipment supplied.
