7-Day Electronic Time Switches

7-Day Electronic Time Switches
7-Day Electronic Time Switches
ET170 Series 7-Day Time Switch (Permits Different Operation Each Day)
These electronic time switches provide to-the-minute programming for accurate load control and reduced
energy costs. Up to 20 set points or events (10 ON/10 OFF or any combination) can be preset to automatically
repeat on a weekly or daily basis. The program can be overridden at any time by placing the selector switch
in the Manual position. These time switches provide for true 7-day load control with up to 140 operations
(70 ON/70 OFF or any combination) each week. Model ET279C provides 20 operations or momentary
contact closures of 1 to 8 seconds (ten each or any combination) for two independent circuits.
Specifications
Case – NEMA 1 – Drawn steel 7-3/4" (19.7 cm) High, 5" (12.7 cm) Wide, 3" (7.6 cm) Deep in gray finish.
NEMA 3R – Drawn steel 9-3/8" (23.8 cm) high, 5-1/2" (14.0 cm) wide, 3-5/8" (9.0 cm) deep in gray finish.
Both types include permanently attached side hinged door with lockable hasp. Mounting holes and/or mounting
bracket included. Separate grounding terminal.
Note: The electronic mechanism snaps into the standard Intermatic time switch case, replacing mechanical mechanisms, if desired.
Knockouts – Combination 1/2"-3/4" nominal knockouts, one on back and each side of case and two on bottom.
Optional Enclosures – See Time Switch Cases for optional enclosures.
Special Voltages and Cycles – ALL models 50 or 60 Hz.
Switch Rating – 30 Amp Inductive/Resistive, 24 / 120 / 240 / 277 VAC 60 Hz; 20 Amp Resistive, 28 VDC;
1 HP 120 VAC 60 Hz; 2 HP 240 VAC 60 Hz; 5 Amp Tungsten, 120 / 240 / VAC 60 Hz; 20 Amp ballast,
120-277 VAC 60 Hz. ET100C same ratings for 120 Volt loads only. Model ET175C normally closed contact ratings:
10A Resistive/General purpose, 12 - 277VAC; 10A Resistive/General purpose, 28VDC; 3A Ballast, 120 - 277VAC;
1/4 HP, 120 VAC; 1/2 HP, 240 VAC; 30 LRA; 12 FLA; 275 VA pilot duty, 120 - 240 VAC
Carry-over – Field replaceable “AA” batteries maintain program and accurate time keeping for 3 years minimum.
Up front replacement does not require removal of mechanism or field wiring.
Wiring Terminals – #18 to #10 AWG wire.
Minimum ON/OFF Times – 1 minute.
Maximum ON/OFF Times – 6 days 23 hours 59 minutes.
Applications:
• Schools
• Offices
• Airports
• Stores
• Hotels
• Restaurants
• Parks
• Apartments
Engineering Specification
For Controlling:
7 Day Electronic Time Switch
The time switch shall be a solid state electronic control capable of permitting 20 ON/OFF set points to be distributed on a daily or
weekly schedule. The time and set points shall be programmable to the nearest minute with a minimum ON duration of 1 minute and
a maximum ON duration of 6 days, 23 hours and 59 minutes. The timer shall have a digital LCD readout to show time-of-day using 12
hour AM/PM indicator. The time switch shall provide a manual override control for both temporary and permanent override. Time switch
shall operate over a temperature range of -40°F (-40°C) to 155°F (68°C).
Industrial grade AA alkaline batteries shall protect program information and carryover time-of-day for a minimum of 3 years. Switch
configuration to be __________ (SPST) or (DPST) with an agency listed rating of: 30 amp Inductive/Resistive, 24/120/240 Volts AC,
60 Hz; 20 amps Resistive, 28 VDC; 1 HP, 120 Volts AC, 60 Hz; 2 HP, 240 Volts AC, 60 Hz; 5 amps Tungsten, 120/240 Volts AC, 60
Hz; 20 amps Ballast, 120-277 Volts AC, 60 Hz. The time switch shall be powered by a __________ (120 volt), (240 volt) 50/60 Hz
source. The time switch shall be enclosed in a lockable ___________ (NEMA 1) or (NEMA 3R) rated enclosure. The time switch shall
be agency listed under UL category 916 Energy Management Equipment and shall be INTERMATIC Model __________ (ET171C/CR),
(ET173C), (ET174C), (ET175C), or (ET279C).
• Water Heaters
• Parking Lot Lighting
• Commercial Ovens
• Interior Lighting
• Air Conditioners
• Fans/Blowers/Pumps
• Livestock Feeders
• Poultry Equipment
• Process Equipment
Model#
UL917
C22.2-177
LR3730
2.5 lbs
1.1 kg
-40°F
(-40°C)
to
155°F
(68°C)
ET171C
ET171CR1
ET173C
ET174C
ET175C
ET279C2,3
Circuits
Switch
Clock Voltage
Amp Rating
HP Rating
Enclosure
1
1
1
1
1
2
SPST
SPST
DPST
DPST
SPDT
SPST
120
120
120
240
120
120
30
30
30
30
10/30
30
1HP / 2HP
1HP / 2HP
1HP / 2HP
1HP / 2HP
1HP / 2HP
1HP / 2HP
NEMA1
NEMA3R
NEMA1
NEMA1
NEMA1
NEMA1
NEMA 3R drawn steel enclosure.
User selectable contacts independent 2xSPST, simultaneous DPST, or pulsed for mechanically held contactor operation.
Complies with California Title 24 requirements for multi-level outdoor lighting control.
1
2
3
42
WEATHERPROOF • ENERGY CONTROLS • PROFESSIONAL LIGHTING • POOL & SPA • SURGE PROTECTION • CONSUMER
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