ECR International CHB Application Manual page 24

4. CCB - Using Multi-Zone Valve System
Boiler call for heat contacts (Key 72) are wired to Argo Zone
Control (x-x) terminals. Zone thermostats and zone valves
are to be wired to the Argo Zone Controller. See Figure 16.
Set Argo Priority Switch to OFF position. This disables priority
operation and all zone valves will operate independently. Refer
to Argo Controller instructions for switch setting and operation
information.
FIGURE 16 - CCB Boiler with Multiple Zone Valves
CCB BOILER - WIRING DIAGRAMS
LIGHTS
Argo AZ - 4CP
CCB BOILER
KEY 370
Key 72
1 2 3 4 5 6
Remove
Jumper if
used
Important:
• Before connecting to Key 72 Terminals,
remove jumper on terminal block. (Key 72)
• Before connecting Low Water Cutoff, remove
jumper on terminal block. (Key 370)
LOW VOLTAGE ROOM THERMOSTATS
LOW VOLTAGE ZONE VALVES
Key 307
7 8
24
NOTICE
SET
PRIORITY
TO OFF
SYSTEM PUMP
CONNECTION
CH SYSTEM
L1
PUMP (If used)
(Hot)
GND
NEU
120 VAC
POWER SUPPLY CORD
120V/60HZ
PN 240011074 REV C, [11/01/2017]