External Accessories; Testing The Electrical Connections - Glow-worm Ultracom 24cxi Installation And Servicing

11.3.2 230V permanent supply + 230V system
controls
a
All cables connected to the appliance should be
i
3
2
1
Key
1 230V permanent supply
2 System controls
3 Frost stat
4 Main board terminal block
= Mains earth
N = Mains neutral
L = Mains live
5 Junction box
6 Fuse
7 Double pole connector
Connect the mains supply and system heating controls e.g.
room thermostat as described.
0020085231_02 - 05/10 - Glow-worm
11.4

External accessories

e Under no circumstances must any mains voltage
be applied to any of the terminals on the 24v
connection plug.
2
4
1
5
6
7
Key
1 24V room thermostat connector
2 Ebus room thermostat connector or Ebus radio receiver
3 Outdoor sensor connector
Fit external controls in accordance with the rules in force.
11.5

Testing the electrical connections

Carry out preliminary electrical system checks as below:
Resistance to earth (<1 Ohm)
Short circuit test (L-N)
Resistance to earth (L-E)
Polarity check
INSTALLATION
24 V BUS
RT 24V T° ext
X17 BUS
X18
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3
4