Potterton Performa 24i HE Installation And Service Instructions Manual page 24

Control Box Cover
Fig. 27
Fig. 28
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. 29
L
External
230 V
Controls
br
br
Selector /
b
Reset Switch
bk
bk
Key to Wiring
b - blue
br - brown
bk - black
r - red
g - green
Fig. 30
24
Facia Panel
Frost Thermostat
L
N
External Clock
230 V
N
br
SL
b
g/y
Room Thermostat
bk
bk
IMPORTANT: If an integral timer is fitted to the
boiler an external frost thermostat wired as
shown will not operate correctly. Only external
timers may be used in such installations, as in
the diagram.
Functional Flow Diagram
Pump
br
bk
b
br
Fan
br
b
b
r
b
r
r
g
g
PCB
bk
bk
b
br
bk
r
r
g
g
8.0
8.8
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. Completely undo the screws securing the facia
panel and hinge it down (Fig. 26).
3. Remove the control box cover securing screws.
Disengage the barbs on the control box from the
cover. Remove the cover (Fig. 27).
4. Slacken the cable clamp on the LH side of the
boiler chassis (Fig. 28). Insert the cable through the
clamp and route it to the terminal block.
Fig. 26
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
br
L
with the control.
b
N
g/y 7. To connect external control(s) remove the link
between terminals 1 & 2. The 230V supply at
bk
1
terminal 1 can be connected to the external
bk
2
control. The switched output from the external
control must be connected to terminal 2 (Fig. 29).
NOTE: If the room thermostat being used
incorporates an anticipator it MUST be wired as
shown in Fig. 29
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 down. Tighten the cable
b
N
clamp(s) on the boiler chassis.
Pressure Switch
9. If the optional integral timer is to be used it should
be fitted at this point. Refer to the instructions
b N
supplied with the timer. NOTE: An external frost
Flue Thermostat
Safety Overheat Thermostat
thermostat cannot be used with the integral timer.
Central Heating
NTC Sensor
DHW
NTC Sensor
8.9
Gas Valve Modulator
Spark Electrode
Gas Valve
1. Prior to commissioning the boiler preliminary
electrical system checks should be carried out.
Condensate Trap
Flame Sensing Electrode
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.
DHW Flow Priority Microswitch
INSTALLATION
Making The Electrical Connections
Preliminary Electrical Checks
Publication No. 5111813