34
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 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.
FIGURE 8-4 Thermostat Connections
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
Room
End Switch
8 - ELECTRICAL CONNECTIONS
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
1K
Ω
sensor.
B. Setting "Kt" Climate Curve
When external
1K
Ω
sensor is connected to boiler, the
electronic board adjusts the flow temperature calculated
according to set Kt coefficient.
Select required curve by pressing
as indicated in
chart below for selecting the appropriate curve (00 to 90).
Flow temp
Outside temp
FIGURE 8-5 Outdoor Sensor Connections
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.
FIGURE 8-6 Kt Climate Curves
80 Is Default.
1K
Ω
NOTICE
Sensors used for this boiler are proprietary to the
manufacturer. Use of after market sensors will diminish
boiler performance.
240012564 REV A, [05/15/2019]