To prevent the risk of personal injury and/or death, make sure
power is not applied to the product until it is fully installed
and ready for final testing. All work must be done with power
turned off to the circuit being worked on.
House Wiring
Pull power supply wiring to the control location. Consider the following:
• Leave about 6 to 8 inches (15 to 20 cm) of wire for connections later.
• This wiring should be size 12 or 14 AWG following appropriate local code
requirements.
• A qualified person should run a dedicated circuit from the main circuit
breaker panel to the control location. If a dedicated circuit is not possible, it
is acceptable to tap into an existing circuit. However, there must be enough
capacity to handle the load (amps) of the floor heating system being installed
and any possible appliance, such as a hair dryer or vacuum cleaner.
• Avoid circuits that have ballasted lighting, motors, exhaust fans, or hot tub
pumps due to possible interference.
• The circuit breaker should be rated 20 amps for total circuit loads up to 15 amps.
A 15 amp circuit breaker may be used for total circuit loads up to 12 amps.
• A GFCI (ground-fault circuit interrupter) or AFCI (arc-fault circuit interrupter)
type circuit breaker may be used if desired, but is not necessary.
Communication Wiring
Pull 18 AWG to 24 AWG 2-conductor shielded wire through the wall from the
SunStat Relay II location to this control location. This wire may be up to 100
feet (30 m) in length. Strip the wire ends 1/8" to 3/16" (3 mm to 4.5 mm) long.
If the ends are stripped longer than this they may short-circuit.
Power Leads from Heating Mat or Cable
Pull the power lead wires from the floor heating system into the control location.
Excess power lead wire may be cut off, but leave about 6 to 8 inches (15 to 20
cm) of wire for connections.
Screw
Cover
Cover Screw
Front
Module
Load 1
Line 2
Load 2
BUS A & B
Terminals
Power
Module
Line 1
Wiring Connections
(see Figure 1 and 2)
Connect the wires as shown in the diagram. Consider the following:
• Gently tug on the wires to make sure they are secure. For added security,
overwrap the Wire Nut connec ons with electrical tape.
• If the electrical box is metal, a short length of wire must be secured to the
electrical box from the ground connec on.
• When connec ng the Communica on Wires to the Bus A and B terminals,
observe polarity. Make sure the wire in the Bus A terminal is connected to
the thermostat Bus A terminal.
Figure 1
Wiring
Removing the Relay Front Module
1. Remove the Screw Cover at the bottom and loosen the screw.
2. Lift the Front Module away from the Power Module.
