Electrical Connections; Access To Connection Block; Main Supply Connection - ECR International Dunkirk DCBF-75 Manual

!
DANGER
Electrocution Hazard! HIGH VOLTAGE -
Connections in terminal block M1 are high
voltage (120V / 60Hz). Before making
connections, verify appliance is disconnected
from power supply. Respect the input polarity
on terminal block M1: L (LINE) - N (NEUTRAL).
Failure to follow these instructions WILL result in
death or serious injury.

8.3 Access To Connection Block

1.
Ensure there is no line voltage at boiler.
2.
Lift and remove front cover. Remove screws (2)
from cover on junction box located on boiler's left
side. Remove junction box cover.
3.
Guide controller or thermostat wire through round
grommet(s) located on top panel of boiler.
4.
Tilt control box forward by opening holding clip
located on left side of control housing.
5.
Expose M1 and M2 terminal blocks by removing
screw from plastic cover on left. See Figure 8-3.
6.
Remove plastic from channel in plastic cover. Run
wires through new opening.
7.
Connect wires to appropriate terminals on
connection block.
8.
Tilt control box back to original position. Ensure clip
on left side of control box is fully engaged.
9.
Replace front cover and cover to junction box.
10.
Turn power to boiler on.
Dry contact end switches from various manufacturers
can be attached to boiler control PCB.

8.4 Main Supply Connection

Main supply is connected to terminal block M1 which is
high voltage (120V / 60Hz).
Fuses, 3.15 A, are incorporated in the power supply
terminal block. To check or replace fuse pull out black
fuse carrier.
TERMINAL BLOCK M1
(L) = Live (brown)
(N) = Neutral (light blue).
= Ground (yellow-green).
(1) (2) = contact for 120V Room Thermostat.
Place jumper back on terminals 1-2 of boiler terminal
block M1 if room thermostat is not used

8 - ELECTRICAL CONNECTIONS

FIGURE 8-2 Terminal Block Locations
FIGURE 8-3 Terminal Plastic Cover with Knockouts
TERMINAL BLOCK M2
Terminals 1 - 2: Buss connection of Open Therm
Terminal 3 : Not used on Combi units
Terminals 3 - 4: Indirect storage tank sensor
connection for heat-only boilers
Terminal 4 - 5: Outdoor temperature sensor
connection (supplied as an accessory)
Terminals 6 - 7 - 8: 24V room thermostat connection
Terminals 9 - 10: 0 - 10V connection
43
Fuse Holders (2)
Remove
New Opening
240013509 REV A, [03/15/2022]