ECR International CHB Application Manual page 17

NOTICE
Important:
• Before connecting to Argo Control remove jumper on
terminal block. (Key 72)
• Before connecting Low Water Cutoff remove jumper on
terminal block. (Key 370)
FIGURE 11 - CHB Boiler WITH SECONDARY ZONE PUMPS AND DHW THERMOSTAT, WITH DHW RESISTOR KIT
NOTE: ZONE PUMPS WILL SHUTOFF DURING DHW PRIORITY W/ PRIORITY SWITCH ON
*Isolation Relay
CHB - WIRING DIAGRAM
ORG
Thermostat
24V 120V
W/BLK
YLW
BLU W/YLW
W/BLU
Argo ARM Zone Pump Control
Optional: Connect indirect tank pump to
Priority Zone 1 terminals (if used).
CHB BOILER
KEY 370
KEY 72
Remove
Jumper
if used
Wire Nuts
17
Low Voltage
DHW
Room Thermostats
L N
Zone Pumps Power Supply
120V/60HZ
KEY
KEY 307
155
RED
WHT
10K
1.8K
BLU
*RESISTOR WIRE
BRN
Important:
Priority Switch
must be ON.
*SUPPLIED IN
RESISTOR KIT
550003082
G
System Pump
CH System
Connection
Pump
(If used)
120 VAC
POWER SUPPLY CORD
120V/60HZ
HARNESS
PN 240011074 REV C, [11/01/2017]