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WIRING ALARM OUTPUT TO BMS
Terminals (11) and (12)
• The SMC is designed to enable the Alarm output whenever any of the
sensors fail or the heating system fails. This output can be connected
to a Building management System (BMS) to enable remote alarming
and reporting.
• The Alarm output terminals do not source any power.
• Connect the SMC Alarm output to a dry-contact BMS alarm input.
WIRING TO 4-20MA REMOTE SET POINT
(Requires System Startup Control Mode to be set to Ext. Interface)
Terminals (24) and (25)
• One of the SMC Control Modes is designed to provide a 4-20mA
remote temperature set point. This set point can be used by a multi-
boiler control (Mini-MOD, SQ-Elite, Multi-MOD Platinum, HWRQ
Platinum) to operate multiple modulating or staging boilers.
• Wire the SMC terminal 24 (mA) to the multi-boiler control's (+) terminal.
• Wire the SMC terminal 25 (-) to the multi-boiler control's (-) terminal.
INPUT WIRING
• All of the SMC's inputs are either sensors or dry-contact. Do not
connect any power to the input terminals as it may damage the input.
WIRING ThE SLAB SENSOR
(Used when System Startup Sensor Type is set to Slab)
Terminals (16) through (21)
• The Slab Sensor is designed to measure the slab temperature and
detect precipitation. See "Slab Sensor Installation" on page 10.
• The sensor wires can be extended with an additional 400' of
6-conductor cable.
• The Brown sensor wire connects to terminal 16 and Blue sensor wire
connects to terminal 17. Both wires read the slab temperature.
• The White sensor wire connects to terminal 18 and Blue sensor wire
connects to terminal 17. Both wires read the temperature of the slab
heater. Its Ohm reading should be close to the temperature read on
the Slab Temp display when control is in Melting or Idling stages.
• The Green sensor wire connects to terminal 19 and Blue sensor wire
connects to terminal 17. Both wires detect precipitation.
• The Red sensor wire connects to terminal 20 and Black sensor wire
connects to terminal 21. Both wires are the sensor heater power.
This heater protect the sensor from freezing.
Make sure that the sensor surface is clean to provide accurate precipitation
readings and control operation. Periodic inspection and cleaning is recommended.
SMC Installation and Operation Manual
ALERT
0-10V
OUTPUT
V+
21
22 23 24 25
WARNING
Class 1 voltages wires (low
voltage) must use a different
knockout, conduit, and path
from any Class 2 voltage
wires (high voltage).
CLOSE OPEN
15
16 17 18 19 20 21
Snow Melt
Sensor
4-20mA
SLAB
OUTPUT
SUPPL
TEMP
-
mA
-
26
22
15
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