ECR International CHB Application Manual page 10

FIGURE 6 - Isolation Relay - Pump Circuit Using System Pump Connections
BOILER CONTROL
System Supply
Pump Connection
Key
307
120 VAC
POWER SUPPLY CORD
120V/60HZ
If larger than 1 amp system
Note
supply pump is required, use
an isolation relay 120 VAC and
separate 120 VAC power supply.
Manufacturer requires use of
isolation relay (240011284) or
equivalent.
Wire nut unused wiring; Relay
coil (24 V) - WHT/BLU; Relay
Note
contact (N.C.) - Blue, to prevent
shorting.
CHB/CCB - WIRING DIAGRAM
JUNCTION BOX
CH System
Pump
(IF≥1 AMP)
10
(120VAC)
Isolation Relay*
240011284
RIBU1C
120 VAC
Power
Supply
PN 240011074 REV C, [11/01/2017]