Heatrae Sadia Amptec 95 022 001 C-400 Fitting Instructions And User Manual page 26

PUMP - RELAY CONTROL FOR AMPTEC BOILERS
2 or 3 boilers on single phase 240V or three phase 415V supply
Isolation relays must be used as shown in figure twenty three 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 Heatrae Sadia Part Number 95 970 135
For 3 boilers use Heatrae Sadia Part Number 95 970 136
PERMANENT
LIVE SUPPLY
240V
NEUTRAL
EARTH
ISOLATION
RELAY COIL
4.7uF CAPACITOR
240V AC
N
PUMP OUTPUT
CONNECTIONS
FROM BOILER
CONN 1
FIGURE TWENTY THREE: PUMP - RELAY CONTROL FOR AMPTEC BOILERS
26
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
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