ECR International CHB Application Manual page 15

FIGURE 9 - CHB Boiler WITH MULTIPLE ZONE PUMPS WITHOUT Indirect Tank (DHW)
CHB - WIRING DIAGRAM
T
Argo ARM Zone Pump Control
CHB BOILER
KEY 370
KEY 72
10K
Remove
1.8K
Jumper
if used
Low Volt
Room Thermostats
T T
G
G G
Zone Pumps
System Pump
Connection
L1
KEY 155 GND
KEY 307
NEU
120 VAC
15
Set Priority Switch
"OFF"
CH Heating Only
High Voltage Power
Supply
G
120V/60Hz
CH System
Pump
(If used)
POWER SUPPLY CORD
120V/60HZ
PN 240011074 REV C, [11/01/2017]