Potterton Gold 4 kW Installation And Servicing Instructions page 26

PUMP - RELAY CONTROL FOR POTTERTON GOLD
2 or 3 boilers on single phase 240V or three phase 415V supply
Isolation relays must be used as shown in figure twenty five below for 2 or more boilers to operate
the pump. Boilers can be connected on a single phase 240V supply or on separate phases of a 415V
supply.
Relay specification:
For 2 boilers use Part Number 94970057
For 3 boilers use Part Number 94970058
PERMANENT
LIVE SUPPLY
240V
NEUTRAL
EARTH
ISOLATION
RELAY COIL
4.7uF CAPACITOR
N
PUMP OUTPUT
CONNECTIONS
FROM BOILER
CONN 1
FIGURE TWENTY FIVE: PUMP - RELAY CONTROL FOR ELECTRIC BOILERS
26
ELECTRIC BOILERS
Coil 240V 50 Hz
Contacts 240V 10Amps N/O (Normally Open)
Isolation Coil to Contact - 415V minimum working.
Capacitor 4.7uF 240V 50Hz Class X2
RL1
240V
4.7uF CAPACITOR
240V AC
N
L
RL 1 - N/O CONTACT
RL 2 - N/O CONTACT
RL 3 - N/O CONTACT
ISOLATION
RELAY COIL
RL2
240V
240V AC
L
PUMP OUTPUT
CONNECTIONS
FROM BOILER
CONN 1
PUMP
LIVE
PUMP
NEUTRAL
EARTH
ISOLATION
RELAY COIL
RL3
240V
4.7uF CAPACITOR
240V AC
N
L
PUMP OUTPUT
CONNECTIONS
FROM BOILER
CONN 1