Potterton Performa 24 Installation & Servicing Instructions Manual page 21

Fig. 33
Control Box Cover
Fig. 34
Cable Clamp
Fuse
Fused supply 3A Always fit fast
230V ~ 50Hz blow 2A fuse
Live (brown)
Neutral (blue)
Earth (green/yellow)
1
230V
2
Terminal Block
Fig. 36
L
External
Controls 230 V
br
br
Selector /
b
Reset Switch
bk
bk
Key to Wiring
b - blue
br - brown
bk - black
r - red
Fig. 38
g - green
w - white
Facia Panel
Frost Thermostat
br
Room Thermostat
b
230V
g/y
SL
bk
N
bk
L
N
External Clock
Fig. 37
Functional Flow Diagram
Pump
br
bk
b
br
Fan
br
b
b
b r
r
r
y
PCB
g
br
w
br
r
r
br
bk
8.7
To connect the mains input cable proceed as
follows:-
1. Slacken the facia panel securing screws and
lift the outercase panel so that its securing tabs
are clear of the facia. Remove the panel.
2. Undo the screws securing the facia panel and
hinge it down (Fig. 35).
3. Remove the control box cover securing
screws. Disengage the barbs on the control box
from the cover. Remove the cover (Fig. 33).
4. Slacken the cable clamp on the LH side of the
boiler chassis (Fig. 34). Insert the cable through
the clamp and route it to the terminal block.
Fig. 35
5. Slacken the screws in the terminal block,
connect the input cable, and tighten the screws.
6. If an external control is to be connected it can
be done at this point. Run the input cable from
the external control through the second cable
clamp on the boiler chassis. Refer to the
instructions supplied with the control.
7. To connect external control(s) remove the link
br
L
between terminals 1 & 2. The 230V supply at
b
N
terminal 1 can be connected to the external
g/y
control as shown. The switched output from the
bk
1
external control must be connected to terminal 2.
2 bk
(Figs. 36 & 37).
NOTE: If the room thermostat being used
incorporates an anticipator it MUST be wired as
shown in Fig. 37.
IMPORTANT: The external control MUST be
suitable for 230V switching.
8. Ensure that both mains input and, where
fitted, external control input cables have
sufficient slack to allow the control box to drop
b N
down. Tighten the cable clamp(s) on the boiler
Pressure Switch
chassis.
b
N
9. If an optional integral timer is to be used it
Safety Overheat Thermostat should be fitted at this point. Refer to the
instructions supplied with the timer.
NTC Sensor
Gas Valve
8.8
Flame Sensing Electrode
1. Prior to commissioning the boiler preliminary
r
Spark Electrode
electrical system checks should be carried out.
b
N
Spark
Generator
2. These should be performed using a suitable
Hydraulic Differential Pressure Switch
meter, and include checks for Ground Continuity,
Resistance to Ground, Short Circuit and Polarity.
3-way Valve Microswitch
b
N
8.0 Installation
Making The Electrical Connections
Preliminary Electrical Checks
21