SSAC CT Series Catalog Page

Dedicated

timers

Delay On Make/Break

CT Series
HVAC/R 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 24 V AC control circuits. Several CT
modules may be combined to provide sequencing ON of any number of loads and sequencing OFF of the
same loads, such as electric heating elements.

Delay on Make and

Delay on Break In One Unit

Use For Fan Delays in Heat-

ing or Cooling Equipment

Use For Multiple Load

Sequencing

24 V AC Operation
Factory Fixed Delays From

1 ... 600 s in 1 s Increments

Approvals:

Operation

Forced Air Heating or Air Conditioning (as shown):

When the thermostat closes, the compressor relay is
immediately energized. At the end of a xed 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 xed 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.

Connection

Function

V = Voltage R = Reset
FS = Fan Switch FR = Fan Relay
T1 = Delay On Make T2 = Delay On Break

Delay On Make
Delay On Break

= Undened time

Accessories

Mounting bracket

P/N: P1023-6

CR = Compressor Relay THMS = Wall Thermostat
Dashed lines are internal connections.

Available Models-

CT1S12 CT1S30 CT1S300

•CT1S45 CT1S8 CT1S90

Female quick connect

P/N: P1015-64 (AWG 14/16)

CT30S1 CT30S150 •CT45S45

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Ordering Table

Quick connect to

screw adaptor

P/N: P1015-18

DIN rail P/Ns:

C103PM (Al)

CT

Series

X

Delay on Make (Fixed)

–Specify time in
seconds from

1 ... 600 s

followed by (S)

X

Delay on Break (Fixed)

–Specify time in
seconds from

1 ... 600 s

←

→

DIN rail adaptor

P/N: P1023-20

See accessory pages for
specications.

5.170

SSAC, LLC. • 800-377-7722 • [e-mail] • [e-mail] • www.ssac.com

• denotes a preferred product

Example P/N:

CT1S120, CT20S60

CT002B01 09.10

Delay On Make/Break

CT Series
HVAC/R Timer

Technical Data

Time Delay

Type Microcontroller
Range 1 ... 600 s
Repeat Accuracy +/-5%
Tolerance (Factory Calibration) +/-20%
Recycle Time ≤ 300 ms

Input

Voltage 24 V AC
Tolerance +/-15%
Line Frequency 50 or 60 Hz

Output

Type Solid state
Form Normally open
Rating 0.75 A steady state, 5 A inrush at 55°C
Voltage Drop ≅ 1.25 V

Protection

Circuitry Encapsulated
Dielectric Breakdown ≥ 2000 V RMS terminals to mounting surface
Insulation Resistance ≥ 100 MΩ

Mechanical

Mounting Surface mount with one #10 (M5 x 0.8) screw
Package 2 x 2 x 1.21 in. (50.8 x 50.8 x 30.7 mm)
Termination 0.25 in. (6.35 mm) male quick connect terminals

Environmental

Operating Temperature -40°C ... +70°C
Storage Temperature -40°C ... +85°C
Humidity 95% relative, non-condensing
Weight ≅ 2.4 oz (68 g)

Thermostat Anticipator Resistor: ≥ 3000 Ω

Dedicated

timers

CT002B01 09.10

Mechanical View

Inches (Millimeters)

5.171

SSAC, LLC. • 800-377-7722 • [e-mail] • [e-mail] • www.ssac.com

• denotes a preferred product