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5. Connect the earth, permanent live and neutral wires to the terminal
block.
Note
Both the permanent live and neutral connections are fused.
Key
Description
Key
Description
A
Fused Spur
b
Blue
B
Room Thermostat
bk
Black
C
External Clock
br
Brown
D
Frost Thermostat
g/y
Green/Yellow
F
Pipe Thermostat
E
Earth
G
Mains Terminal Block M1
N
Neutral
H
Low Voltage Terminal Block M2
L
Live
6. Refer to the instructions supplied with the external control(s).
7. Remove the link between terminals 1 and 2.
8. The 230V supply at terminal 2 must be connected to the thermostat.
9. The switched output from the thermostat must be connect to termi
nal 1.
Important
The 230V switched signal for external controls (frost thermostat —
room thermostat — timer) must always be taken from terminal 2 at
the boiler. Live, Neutral and Earth to power these controls must be
taken from the Fused Spur.
10. Reclip the terminal block cover back into position and hinge back the
control box.
Preliminary electrical checks
Prior to commissioning the boiler preliminary electrical system checks
should be carried out.
These should be performed using a suitable meter, and include checks
for Earth Continuity, Resistance to Eart, Short Circuit and Polarity.
Fig.36
Typical electrical connections
PN-0000396
b
br
b
bk
g/y
1
N
L
2
N
N
L
230V
230V
b
br
b
bk
g/y
1
N
L
2
N
N
L
E
230V
E
E
E
A
B
A
B
C
D
F
G
G
6 Installation
7678846 - A - 22052017
43
Содержание assure combi 25
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