User guide

26
14.0 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 gure 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 specication: 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
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
RL 1 - N/O CONTACT
RL 3 - N/O CONTACT
RL 2 - N/O CONTACT
PUMP
LIVE
PUMP
NEUTRAL
EARTH
ISOLATION
RELAY COIL
RL1
240V
N
L
4.7uF CAPACITOR
240V AC
ISOLATION
RELAY COIL
RL2
240V
N
L
4.7uF CAPACITOR
240V AC
ISOLATION
RELAY COIL
RL3
240V
N
L
4.7uF CAPACITOR
240V AC
PUMP OUTPUT
CONNECTIONS
FROM BOILER
CONN 1
PUMP OUTPUT
CONNECTIONS
FROM BOILER
CONN 1
PUMP OUTPUT
CONNECTIONS
FROM BOILER
CONN 1
FIGURE TWENTY FIVE: PUMP - RELAY CONTROL FOR AMPTEC BOILERS