Optional Electrical Connections - ECR International Dunkirk DCBF-125 Installation, Operation And Maintenance Manual

8.6 Install Themostat
Install room thermostat on inside wall. Do not install where it
will be influenced by drafts, hot or cold water pipes, lighting
fixtures, television, sun rays or near a fireplace.
Dry contact only - do not apply 24 volts between 6 and 7.
A. Connect Room Thermostat
• turn power off to boiler;
• access terminal block M2;
• connect room end switch to terminals 6(R)-7(W); Do
not apply dry volt between 2 terminals. Dry contact
only.
• turn boiler power on;
• verify room end switch operates per end switch
manufacturer's instructions.
NOTE: maximum load allowed is 10 mA
Dry contact end switches from various manufacturers can be
attached to boiler control PCB.

8.7 Optional Electrical Connections

A. 1K Ohm (1K Ω) Outdoor Temperature Sensor
To connect this accessory, see figure 8-5, terminals 4-5, and
instructions supplied with
B. Setting "Kt" Climate Curve
1K Ω
When external sensor is connected to boiler, the
electronic board adjusts the flow temperature calculated
according to set Kt coefficient.
Select required curve by pressing
chart below for selecting the appropriate curve (00 to 90).
Flow temp
FIGURE 8-6 Kt Climate Curves
80 Is Default.
NOTE: Temperatures below -40 °F (-40 °C), maximum heating flow temperature set point no longer increases, curves shown
on graph become horizontal.
Boiler setpoint will override sensor setpoint.
8 - ELECTRICAL CONNECTIONS
1K Ω
sensor.
as indicated in
Outside temp
FIGURE 8-4 Thermostat Connections
FIGURE 8-5 Outdoor Sensor Connections
1K Ω
Sensors used for this boiler are proprietary to the
manufacturer. Use of after market sensors will diminish
boiler performance.
37
Thermostat
NOTICE
240012879 REV A, [01/31/2020]
A