Install Room End Switch; Optional Electrical Connections - Dunkirk DCBF-100 Manual

8.6 Install Room End Switch

Install room end switch 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 End Switch
• turn power off to boiler;
• access terminal block M2;
• connect room end switch to terminals 6(R)-
7(W)-8(C); Do not apply dry voltage between 2
terminals. Dry contact only.
• turn boiler power on;
• verify room end switch operates per end switch
manufacturer 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
1.
Boiler automatically recognizes OAS sensor when
wired to M2 terminal block. Display changes to show
current default "Kt" value (80). Note display value.
2.
When operating in CH mode, boiler setpoint is
determined by the Kt value selected and actual
outside air temperature. Refer to applicable °F (or
°C) chart, (pg. 30) for setpoint information.
• Select Kt range which will satisfy the desired
boiler delivery temperature based on outdoor
temperature range expected for your location. For
example: if you need 176°F water when the outside
temperature is 20°F and colder, select 35 for your
Kt setting.
• To change"default" Kt value on boiler control use
or CH Heating buttons.
• Restrict the upper limit of the Kt curve by using
Parameter P16 to set the maximum boiler water
temperature. P16 Default is 176°F.
3.
When OAS is installed, pressing
buttons will no longer display boiler CH setpoint
temperature. It now displays the Kt value which can
range from 10 to 90.
4.
When scrolling has stopped, boiler will automatically
"SAVE" value as new Kt default value and
automatically return to CH mode when no Kt
adjustment activity is sensed. Kt values can be
changed in +/- 1 point increments.
5.
To return, to verify or change current Kt "default
value, depress one of the CH setpoint adjustment
buttons (once),
standby mode. Adjust Kt value to obtain desired
comfort level.
8 - ELECTRICAL CONNECTIONS
1K Ω sensor.
or
or , while in any heating or
FIGURE 8-4 Thermostat Connections
FIGURE 8-5 Outdoor Sensor Connections
1k Ω
Sensors used for this boiler are proprietary
Note
to the manufacturer. Use of after market
sensors will diminish boiler performance.
42
Room End
W
Switch
R
240013375 REV A, [07/01/2021]
A