
DELTA-THERM Corp., P.O. Box 345, Wauconda, IL 60084 (800) 526-7887 Fax (847) 526-4456
Snow MeltingSnow Melting Q.I.G.
leaders in engineered heat trace
OTS-F1
TIMER ON
SYSTEM ON
RESET
TIMER
DELTA-THERM
START
125
4
36
14
3
25
TBTBTATA
MS
Rid
OTS-F1 Outdoor
Temperature
Probe
Neutral (TA2)
Switchleg, (TA4)
Line (TA1)
Black
Red
White
Green
MS
OTS-F1
125
4
36
14
3
25
TBTBTATA
Black
Neutral TA2, Neutral
Switchleg, TA4
Line, TA1
OTS-F1 Outdoor
Temperature
Probe
Jumper
TA1 -TA3
(Field
Installed)
Red
White
Green
WARNING: This device must be installed by a qualified electrician. All assembly, installation, and test instructions must be followed. Improper
installation can result in property damage, serious injury, and/or death due to electric shock. Call Delta-Therm at 1-800-526-7887 with any
installation or operating questions.
Finished
Install
NOTE: The National Electrical
Code (NEC) requires 30mA
Ground Fault Protection Equip-
ment (GFPE) on this system.
Check with all local codes
prior to installation.
4 (Optional)
5 (Optional)
DTC120-S
1
2
3
Wired to Enclosed
Contactor Panel
DTC120-S is designed to detect
snow or ice, and automatically
activate contactors for snow melting
cables or mats.
DTC120-S INCLUDES:
DTC Control Panel1.
MS Slab Sensor (1 or 2)2.
OTS-F1 Ambient Thermostat3.
OPTIONAL ITEMS:
RID (Remote Indicator and4.
Activation Timer)
Enclosed Contactor Panel5.
Parking
Clearance 9'-6"
Contactors
RID
OTS-F1
Heating Cable Line In
3-wire
Switched
120 V
120 V Control Line Voltage
From Power Distribution Panel
2-wire
4-wire
Low Voltage Wiring from DTC
MS Sensor(s)
Mount Flush
With Pavement Surface
DTC-120
Outdoor
Temperature
Probe
Power
Distribution
Panel
Heating Cable Load In
Enclosed
Contactor
Panel
5 Optional 1 4 Optional 3
2
C_DTC_S_Contactor_1009_QIG
DELTA-THERM.COM Toll Free (800) 526-7887 [email protected]5
Wiring DTC120-S
to Enclosed
Contactor Panel
6
Installing and
Wiring RID