ECR International CHB Application Manual page 23

1. CCB Boiler Wiring Diagrams
All field wiring shall conform to the authority having
jurisdiction or, in the absence of such requirements to:
USA: National Electrical Code, ANSI/NFPA 70,
Canada: Canadian Electrical Code, Part I, CSA
C22.1: Safety Standard for Electrical Installations.
2. CCB/Single Zone
Single room thermostat (Key 72) will control the internal
pump and boiler operation. Remove jumper when connecting
the thermostat or zone equipment.
See Figure 15.
3. CCB When System Supply Pump is
Needed:
• External system supply pump connection terminals
(Key307) are being added to the rear of the control box
and will be limited to an additional 1 AMP pump operation.
Internal fusing will prevent higher pump operation.
If a larger system pump is required use an isolation relay.
See Wiring Figure 6.
• If the Controller is not equipped with these terminals,
or a larger pump capacity is required. You will need to
install an external pump/relay controller circuit. See
Instructions And Wiring Diagram For Adding External
Pump (615000137) provided with this manual.
FIGURE 15 - CCB Boiler with Optional Supply System Pump
KEY 72
T T
T
Low Voltage
Room Thermostat
CCB BOILER - WIRING DIAGRAMS
CCB BOILER
KEY 370
1 2 3 4 5 6
Remove
Jumper If
Used
Important:
• Before connecting to Key 72 Terminals
remove jumper on terminal block.
• Before connecting Low Water Cutoff, remove
jumper on terminal block. (Key 370)
S
N.O.
7 8
23
NOTICE
Wiring Legend CHB/CCB
Pump - Zone
Thermostat
Indirect Tank (DHW Sensor)
(CHB ONLY)
Resistor
Valve - Zone
DHW Flow Switch (CCB only)
System Pump
Connection
L1 (Hot)
Key 307
GND
NEU
120 VAC
Power Supply Cord
120V/60HZ
PN 240011074 REV C, [11/01/2017]
CH System
Pump
(If used)