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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 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 contract 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
1K Ω
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
for selecting the appropriate curve (00 to 90).
Flow temp
Sensors used for this boiler are proprietary to the manufacturer. Use of after market sensors will
diminish boiler performance.
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 set-point will override sensor set-point.
sensor.
as indicated in chart below
Outside temp
NOTICE
FIGURE 8-4 End Switch Connections
FIGURE 8-5 Outdoor Sensor Connections
1K Ω
37
240012485 REV C [06/30/2019]
A
Room End Switch
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