Wiring Diagram - heat-timer RSM Installation & Operating Instructions Manual

Wiring the Power
• Attach line voltage to the two orange wires extending from the back of the RSM.
• Use wire nuts, or wrap the connections with electrical tape.
• Class 1 voltages must enter the 1900 box through a different opening from any Class 2 wiring.
Wiring the Sensors
• The sensor wires have no polarity. Either wire from a sensor can be connected to the appropriately marked RSM screw
terminal (see below) or the sensor common marked COM.
• Either or both screw terminals marked COM can be used as the sensor common. They are interchangeable.
• The two wires from the Outdoor sensor must be connected to the RSM front screws marked OUT and COM.
• The two wires from the Slab Supply sensor must be connected to the RSM front screws marked SUP and COM.
• The two wires from the Slab Return sensor must be connected to the RSM front screws marked RTN and COM.
Wiring the Output - Heat Source
• The RSM has one set of Normally Open (N.O.) dry contacts (blue wires) to activate the heat source for the slab.
• The N.O. contacts do not output power. They simply switch power through the circuit.
• If the heat source will be active whenever the RSM will activate the slab heat (as would be the case if the heat source is
also used for space heating), connect the blue wires in series with the power for the slab pump.
• If the boiler for the slab heating system has a dedicated pump, simply connect the blue wires in series with the limit
controls of the boiler so that both the boiler and pump start.
• If the boiler and pump for the slab must be energized separately, use the blue wires to energize an external double pole
single throw (DPST) relay. Attach one set of external relay contacts in series with the slab pump power. Attach the
other set of external relay contacts in series with the limit controls of the slab boiler.
• The RSM contacts can switch 10A, 1/8 HP at 120V. If the slab pump or boiler requires more power, an external relay
must be used.
Outdoor Sensor
Slab Supply Fluid Sensor
Slab Return Fluid Sensor

WIRING DIAGRAM

OUTPUT
= S u p p l y T e m p
= R e t u r n T e m p
= Target
= Slab ∆T
= Supply Limit
= Cut-Off Temp
= T u n e
O U T S U P R T N C O M EXT C O M
To Optional
External Starter
Blue
Blue
Red
White
Black
UP
PRESS TO READ
D O W N
3
N.O. Contacts
Activate Heat Soure
Valve Motor Common
Valve Motor Open
Valve Motor Close
120VAC Input