Install Instructions

7 of 36 © 2016 Watts Water Technologies
Ground
Lead
200 ohm
setting
Black
Lead
White
or Blue
Lead
Black
Lead
White or
Blue Lead
Ground
Lead
Black
Lead
White or
Blue Lead
Ground
Lead
Temperature Typical Values
55°F (13°C) 17,000 ohms
65°F (18°C) 13,000 ohms
75°F (24°C) 10,000 ohms
85°F (29°C) 8,000 ohms
Table 3 - Floor Sensor Resistance Values
STEP 1.1
Remove the WarmWire, SunStat thermostat, and SunStat sensor from their packages. Inspect
them for any visible damage. Verify everything is the correct size and type according to the
plan and the order. Do not attempt to install a damaged product.
STEP 1.2
Record the product information. There is a factory-applied nameplate label on the power
leads. Do not remove this label. Record the cable serial number, model number, voltage,
and cable resistance range in the Cable and Sensor Resistance Log (Table 4). If installing
more than one cable, do this for each of them.
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.
STEP 1.3
Use a digital multi-meter set to the 200Ω or 2000Ω
(2kΩ) range to measure the resistance between
the conductors of the cable power leads. Record
these resistances in Tab l e 4 under “Out of the
box before installation”. The resistance should
measure within the resistance range on the
nameplate label. If it is a little high or low, it may
be due to air temperatures or meter calibration.
Consult the factory if in doubt.
Measure the resistance between either of the
white or black leads and ground lead. This
measurement should be “open”, usually indicated
by an “OL” or a “I”. This is the same as displayed
when the test leads are not touching anything.
If there is any change in the reading, record
this information and contact the factory before
continuing. This could indicate damage, test
lead problems, or a number of other issues.
Try “pinning” the test leads to the cable lead
wires against a hard non-metal surface if the
readings continue to fluctuate.
Change the meter to the 20,000 ohms (20 kΩ)
range. Measure between the lead wires of the
SunStat sensor. This resistance varies according
to the temperature sensed. Table 3 provides
approximate resistance-to-temperature values
for reference.