ECR International CHB Application Manual page 13

FIGURE 8 - CHB - Boiler Zoned System with Multiple ZONE VALVES WITH Indirect Tank
CHB - WIRING DIAGRAM
Lights
Argo AZ- 4CP
VALVE
CHB BOILER
KEY 370
Key 155
Key 72
Remove
Jumper
S
if used
INDIRECT TANK
SENSOR
Remove two (2) factory
installed resistors when
using Indirect Tank
Sensor on Key 155.
[Use kit 550002958]
Low Volt Room Thermostats
VALVE VALVE
VALVE
Low Voltage Zone Valve(S)
System
Pump
Connection
L1 (Hot)
Key 307
GND
NEU
120 VAC
13
Set Priority Switch
"OFF"
CH SYSTEM
PUMP
(If Used)
L
N
WITH INDIRECT
TANK
POWER SUPPLY CORD
120V/60HZ
PN 240011074 REV C, [11/01/2017]