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System Output Operation
System Pump Terminals (4) and (5)
• Whenever the SMC operates the boiler or the motorized valve, it activates
the System output. See "Slab Sensor Operation Overview" on page 4 and
"Outdoor Sensor Operation Overview" on page 6.
• After the SMC turns the boiler off or fully closes the motorized valve, it
keeps the System Pump energized for the Run-On period. The Run-On
period helps protect the boiler from reaching its limits by transferring its
energy into the system.
Slab Output Operation without Precipitation
Slab Pump Terminals (9) and (10)
• In Idle Mode, the SMC shall intermittently energize the Slab Pump relay. It
does this by energizing the pump for 15 seconds for every Antifreeze time
setting. See "Antifreeze" on page 30.
• Whenever the slab temperature drops to or below the ISP, the SMC shall
energize the Slab Pump relay to maintain the ISP.
• Whenever the slab temperature drops to or below the CWC setting,
the SMC shall energize the Slab Pump relay for 15 seconds for every
Antifreeze period setting. This reduces the possibility of freezing.
Slab Output Operation with Precipitation
• Whenever the slab temperature drops to or below the WWC setting, the
SMC shall energize the Slab Pump relay to maintain the WWC during the
melting period.
WIRING TO A FLOATING MOTORIzED VALVE
(Requires System Startup Control Mode to be set to Motorized Valve)
Terminals (13) through (15)
• The SMC is capable of modulating a floating motorized valve.
• In this case use the SMC output terminal 14 as the Common. Wire it to the
24 VAC power source (transformer).
• Connect the transformer's other wire to the actuator Common terminal.
• Wire output terminal 13 on the SMC to the actuator Close terminal.
• Wire output terminal 15 on the SMC to the actuator Open terminal.
• The transformer is the motorized valve power source.
WIRING TO A MODULATING MOTORIzED VALVE
(Requires System Startup Control Mode to be set to Motorized Valve)
• The SMC is capable of operating a current or voltage modulating motorized
valve.
• When operating a 0-10V modulating motorized valve use the SMC 0-10V
Output terminals 22 and 23. See "0-10V Modulating Boiler or Valve Wiring"
on page 14.
• When operating a 4-20mA modulating motorized valve use the SMC
4-20mA Output terminals 24 and 25. See "4-20mA Modulating Boiler or
Valve Wiring" on page 14.
SMC Installation and Operation Manual
SYSTEM
SLAB
PWR
PUMP
BURNER
PUMP
OR VALVE
L N G
1 2 3
4 5 6 7 8 9 10 11 12
120VAC
Slab
Pump
SLAB
PUMP
ALARM
VALVE
CLOSE OPEN
10 11 12 13 14 15
16 17 18 19 20 21
120
VAC
Transformer
Floating
Motorized
Valve
ALARM
13
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