ECR International CHB Application Manual page 12

FIGURE 7 - CHB - Boiler Zoned System with Multiple ZONE VALVES WITHOUT Indirect Tank
CHB - WIRING DIAGRAM
Lights
Argo AZ- 4CP
VALVE
CHB BOILER
KEY 370 Key 155
Key 72
Remove
10K
Jumper
1.8K
if used
Factory Supplied
12
Low Volt Room Thermostats
VALVE VALVE
Low Voltage Zone Valve(S)
System
Pump
Connection
L1 (Hot)
GND
Key 307
NEU
120 VAC
Resistors
PN 240011074 REV C, [11/01/2017]
Set Priority Switch
"OFF"
For Central
Heating Only
VALVE
CH SYSTEM
PUMP
(If Used)
POWER SUPPLY CORD
120V/60HZ