CT1S30 LITTELFUSE | Alldatasheet
Document overview
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Technical content
© 2016 Littelfuse Protection Relays & Controls Time Delay Relays Dedicated - HVAC www.littelfuse.com/ Rev: 1-A-062116 www.littelfuse.com/ct CT SERIES L1 N V = Voltage FR = Fan Relay FS = Fan Switch CR = Compressor Relay THMS = Wall Thermostat Delay-on-Make/Delay-on-Break Timer
Description
The CT Series combines a delay-on-make and delay-on-break time delay into one unit and may be used to control fan delays in heating and/or cooling equipment. The CT includes bypass circuitry to allow it to operate with cooling anticipators ≥ 3000 ohms. It is designed to operate in 24VAC control circuits. Several CT modules may be combined to provide sequencing of any number of loads and sequencing off of the same loads, such as electric heating elements. Operation (Delay-on-Make/Delay-on-Break) Forced Air Heating or Air Conditioning (as shown): When the thermostat closes, the compressor relay is immediately energized. At the end of a fixed delay-on-make delay (T1), the fan relay is energized. When the thermostat opens, the compressor relay is de-energized and the delay-on-break delay is initiated. On completion of the fixed delay-on- break delay (T2) the fan relay is de-energized. If the thermostat is reclosed during the delay-on-break delay, the delay-on-break delay is reset and the fan relay remains energized. If the thermostat is closed when input voltage is applied, the delay-on-make delay (T1) begins as normal. Reset: Removing input voltage resets the output and time delays. Features & Benefits FEATURES BENEFITS Delay-on-Make and Delay-on-Break in one unit Simplifies wiring and installation, and optimizes efficiency of heating and cooling systems T otally solid state and encapsulated No moving parts to arc and wear out over time and encapsulated to protect against shock, vibration, and humidity Interconnectability with other CT modules Combine modules to provide sequencing on of a number of loads and sequencing off of the same loads Accessories P1015-64 (AWG 14/16) Female Quick Connect These 0.25 in. (6.35 mm) female terminals are constructed with an insulator barrel to provide strain relief. P1023-6 Mounting bracket The 90° orientation of mounting slots makes installation/removal of modules quick and easy. P1015-18 Quick Connect to Screw Adapter Screw adapter terminal designed for use with all modules with 0.25 in. (6.35 mm) male quick connect terminals. Wiring Diagram
Ordering Information
(FIXED SECONDS) DELAY-ON-BREAK (FIXED SECONDS) CT1S30 1 30 CT1S45 1 45 CT1S8 1 8 CT1S90 1 90 CT30S1 30 1 CT45S45 45 45 CT5S300 5 300 If you don’t find the part you need, call us for a custom product 800-843-8848
© 2016 Littelfuse Protection Relays & Controls Time Delay Relays Dedicated - HVAC www.littelfuse.com/ Rev: 1-A-062116 www.littelfuse.com/ct Accessories C103PM (AL) DIN Rail 35 mm aluminum DIN rail available in a 36 in. (91 .4 cm) length. P1023-20 DIN Rail Adapter Allows module to be mounted on a 35 mm DIN type rail with two #10 screws. Function Diagram DELAY -ON-MAKE DELAY -ON-BREAK CT SERIES Specifications Time Delay Type Microcontroller Range 1 - 600s Repeat Accuracy ±5% Tolerance (Factory Calibration) ±20% Recycle Time ≤ 300ms Input Voltage 24VAC Tolerance ±15% AC Line Frequency 50/60 Hz Output Type Solid state Form NO Rating 0.75A steady state, 5A inrush at 55°C Voltage Drop ≅ 1.25V Protection Circuitry Encapsulated Dielectric Breakdown ≥ 2000V rms terminals to mounting surface Insulation Resistance ≥ 100 MΩ Mechanical Mounting Surface mount with one #10 (M5 x 0.8) screw Dimensions H 50.8 mm (2”); W 50.8 mm (2”); D 30.7 mm (1.21”) Termination 0.25 in. (6.35 mm) male quick c onnect terminals Environmental Operating/Storage Temperature -40° to 70°C / -40° to 85°C Humidity 95% relative, non-condensing Weight ≅ 2.4 oz (68 g) Thermostat Anticipator Resistor: ≥ 3000 Ω V = Voltage FS = Fan Switch FR = Fan Relay T1 = Delay-on-Make T2 = Delay-on-Break R = Reset = Undefined Time