External Accessories; Testing The Electrical Connections - Glow-worm Ultracom 2 24cxi Installation And Servicing

11.3.2 230V permanent supply + 230V system
controls
a
All cables connected to the appliance should be
permanently fixed to the wall.
i This appliance will not operate without a link or
system controls fitted.
3
2
1
Key
1 230V permanent supply
2 System controls
3 frost stat
4 Main board terminal block
FP = Frost stat 230V (switchable)
RT = Switch live (230V)
= 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
Supplied By www.heating spares.co Tel. 0161 620 6677
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
4 Overheating safety connector for heating floor
• 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
- 23 -
3
4