Install Instructions

Install the Control
Install the control(s) for the mats
according to the wiring diagrams pro-
vided with the controls. See the dia-
grams are shown on pages 11–13.
Connect the power supply leads,
the power drop to the mat junction
box, and the floor sensor wire to the
SunStat. Follow proper wiring proce-
dures.
It is a good idea to overwrap the
wire nuts with electrical tape to further
secure the wires into the wires nuts
before pushing the control back into
the electrical box.
If a SunStat Relay is used, connect
the power supply leads and power
drop for the mats to the relay. Run a
2-wire 22-gauge or 24-gauge wire, or
similar low-voltage cable, to connect
the Relay(s) to the master SunStat.
Connect the floor sensor wire to the
10 SunTouch UnderFloor Installation Manual
PART 4: Final Wiring
master SunStat.master control.
Test the System
After the controls are installed and
connected, energize the system briefly
to test operation of all components.
Refer to the installation sheets pro-
vided with the SunStat for proper
setting.
Without floor insulation, the mat will
not heat the floor. When the SunStat
calls for heat to the mat, the mat will
begin to feel warm to the touch within
1 to 2 minutes or so. If this does not
occur, recheck the SunStat settings,
wiring connections, and power supply.
Apply the Warning Label
Apply the Radiant Heating Warning
Label (pg. 5) to the control or nearby
location.
Install R-13 to R-19 fiberglass insula-
tion below the mat. Gently press the
insulation up to the mat for best results
and secure in place with rods, staples,
or other method. A gap between the
insulation and mat is acceptable but
will not give the best heating results.
Make sure to insulate at the end of
all heated joist cavities. Install insula-
tion vertically in these areas to seal
the ends of the heated joist areas or,
6” after the mat “stops” in a joist space,
push the insulation up tight against
the subfloor and staple to the subfloor.
This ensures that no heated air can
escape from the heated joist space.
If this is not done, much heat will
“escape” horizontally through band
joists, rim joists, exterior walls, and
open ends of joist spaces, and the floor
will not warm as it should.
Seal openings around pipes, waste
lines, ducts, joist blocking, and all other
gaps with silicone caulking or urethane
foam.
PART 5: Install the Insulation
The mat power leads and sensor wire connected
to the control at the electrical box.
REMEMBER: Proper insulating and sealing of the floor cavity is necessary for
the performance of SunTouch UnderFloor mats.