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PI-PR-18050-0309 (Digital Thermostat)
Product Instructions
Digital Thermostat
4 of 4
Advanced Wiring of Digital Thermostats
NTC A/B
C C R W
24 VAC
TRANSFORMER
120 VAC
INPUT
WHITE
BLACK
Optional
Floor sensor
Wiring Floor Sensor
The Digital Thermostat Floor Sensor is a
two wire, water-sealed probe that can be used to
accurately measure slab or floor temperatures.
Floor Sensor should be placed in conduit for
protection and repair. 1/2" PEX (capped or
plugged) is commonly used as conduit for the slab
sensor. Sensor should be 18" from line voltage
(110V). If crossing line voltage wire cross at 90°
angle. Line voltage interference can result in
inaccurate readings of the sensor.
Connect one wire of the floor sensor to one
1.
"NTC" terminal of the Digital Thermostat.
Connect the other wire of the floor sensor
2.
to the other "NTC" terminal of the Digital
Thermostat.
(See diagram to right)
Wiring External Clock
The Digital Thermostat is compatible with an
external clock for timed set-back. Press the "OK"
button to select the External Clock Mode.
The thermostat display indicates weather it's in
Comfort Mode or Reduced Temperature Mode by
blinking the or symbols.
Powerhead(s) and Transformer
Connect "R" terminal of the thermostat to the
1.
transformer.
Splice into the "R" terminal wire and connect
2.
that to inlet side of an external clock.
Connect the outlet side of the external clock
3.
to A/B terminal on right side of thermostat.
Connect the "W" terminal of the thermostat to
4.
powerhead(s).
Connect a "C" terminal of the thermostat to
5.
the powerhead(s).
Connect a "C" terminal of the thermostat to
6.
the transformer.
(See diagram top right)
Zone Control
Connect "R" terminal of the thermostat to the
1.
"R" of Zone Control.
Splice into the "R" terminal wire and connect
2.
that to inlet side of an external clock.
Connect the outlet side of the external clock to
3.
A/B terminal on right side of thermostat.
Connect the "W" terminal of the thermostat to
4.
"W" of the Zone Control.
Connect a "C" terminal of the thermostat to the
5.
"C" of the Zone Control.
(Not shown)
Temperature
Resistance (k
Ω
)
50°F
~ 19.5k
Ω
59°F
~ 15.5k
Ω
68°F
~ 12.5k
Ω
77°F
~ 10k
Ω
86°F
~ 8k
Ω
Resistance Chart
