36
8.4 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 in the junction box on boiler's left
side.
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.
8.5 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 or if Remote Control is
not installed.
FIGURE 8-2 Terminal Block Locations
Fuse Holders (2)
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.
!
FIGURE 8-3 Terminal Plastic Cover with Knockouts
Remove
New Opening
8 - ELECTRICAL CONNECTIONS
TERMINAL BLOCK M2
Terminals 1 - 2
: Bus connection of Open Therm Gateway
for ECR programmable room unit thermostat (supplied as an
accessory)
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
240012879 REV A, [01/31/2020]
Summary of Contents for Dunkirk DCBF-125
Page 63: ...61 A 1 MODELS 125 Heat Only APPENDIX A WIRING DIAGRAMS 240012879 REV A 01 31 2020...
Page 64: ...62 APPENDIX A WIRING DIAGRAMS A 2 MODELS 165 Heat Only 240012879 REV A 01 31 2020...
Page 65: ...63 A 2 MODELS 150 Combi APPENDIX A WIRING DIAGRAMS 240012879 REV A 01 31 2020...
Page 66: ...64 A 4 MODELS 205 Combi APPENDIX A WIRING DIAGRAMS 240012879 REV A 01 31 2020...
Page 67: ...65 NOTES 240012879 REV A 01 31 2020...
Page 68: ...66 NOTES 240012879 REV A 01 31 2020...
Page 99: ...29 MODEL 150F Combi 150F FLOOR STANDING COMBI WIRING DIAGRAM PN 240012875 REV A 01 31 2020...
Page 101: ...31 205F FLOOR STANDING COMBI WIRING DIAGRAM MODEL 205F Combi PN 240012875 REV A 01 31 2020...
Page 106: ...36 Low Water Cutoff Detail LOW WATER CUTOFF NO NO YES PN 240012875 REV A 01 31 2020...
Page 114: ...44 NOTES PN 240012875 REV A 01 31 2020...
