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Timer - Delay-on-Make/Delay-on-Break
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 on of any
number of loads and sequencing off of the same
loads, such as electric heating elements.
Connection:
L1
N
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 delayon-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.
For more information see:
Appendix B, page 165, Figure 1 for dimensional drawing.
Function:
CR = Compressor Relay
THMS = Wall Thermostat
Order Table:
CT
X
Delay-on-Make (fixed)
─Specify time in seconds
from 1 - 600s followed by (S)
Delay-on-Make
Delay-on-Break
CT Series
Features:
•Delay-on-make and delay-on-break in one
unit
•Use for fan delays in heating or cooling
equipment
•Use for multiple load sequencing
•24VAC operation
•Factory fixed delays from 1 - 600s in 1s
increments
Approvals:
Auxiliary Products:
• Female quick connect:
P/N: P1015-64 (AWG 14/16)
• Mounting bracket: P/N: P1023-6
• Quick connect to screw adaptor:
P/N: P1015-18
• DIN rail: P/N: C103PM (Al)
• DIN rail adaptor: P/N: P1023-20
Available Models:
CT1S12
CT1S30
CT1S300
CT1S45
CT1S8
CT1S90
CT30S1
CT45S45
CT5S300
If desired part number is not listed, please call us to
see if it is technically possible to build.
V = Voltage
R = Reset
FS = Fan Switch
FR = Fan Relay
T1 = Delay-on-Make
T2 = Delay-on-Break
X
Delay-on-Break (fixed)
─Specify time in seconds
from 1 - 600s
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
www.ssac.com • 800-843-8848 • fax: 605-348-5685
Protection
Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dielectric Breakdown. . . . . . . . . . . . . . . . . . . .
Insulation Resistance. . . . . . . . . . . . . . . . . . . . .
Mechanical
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Environmental
Operating / Storage Temperature . . . . . . . . .
Humidity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermostat. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Encapsulated
≥ 2000V RMS terminals to mounting surface
≥ 100 MΩ
Surface mount with one #10 (M5 x 0.8) screw
2 x 2 x 1.21 in. (50.8 x 50.8 x 30.7 mm)
0.25 in. (6.35 mm) male quick connect terminals
-40° to 70°C / -40° to 85°C
95% relative, non-condensing
≅ 2.4 oz (68 g)
Anticipator Resistor: ≥ 3000 Ω
101
Appendix B - Dimensional Drawings
FIGURE 1
FIGURE 2
FIGURE 3
CT; ESD5; ESDR; FS100; FS200; FS300; KRD3; KRD9;
KRDB; KRDI; KRDM; KRDR; KRDS; KRPD; KRPS;
KSD1; KSD2; KSD3; KSD4; KSDB; KSDR; KSDS;
KSDU; KSPD; KSPS; KSPU; KVM; T2D; TA; TAC1;
TAC4; TDU; TDUB; TDUI; TDUS; TL; TMV8000;
TS1; TS2; TS4; TS6; TSB; TSD1; TSD2; TSD3; TSD4;
TSD6; TSD7; TSDB; TSDR; TSDS; TSS; TSU2000
HLV; HRD3; HRD9; HRDB; HRDI;
HRDM; HRDR; HRDS; HRID; HRIS;
HRIU; HRPD; HRPS; HRPU; HRV; RS
HSPZ
FIGURE 4
FIGURE 5
TRDU
FIGURE 6
TRU
FA; FS; FSU1000*; NHPD; NHPS; NHPU;
NLF1*; NLF2*; PHS*; PTHF*; SIR1; SIR2;
SLR1*; SLR2*; TH1; TH2; THC; THD1;
THD2; THD3; THD4; THD7; THDB; THDM;
THDS; THS
*If unit is rated @ 1A, see Figure 1
FIGURE 7
FIGURE 8
FIGURE 9
PLM; PLR; TDB; TDBH; TDBL; TDI; TDIH;
TDIL; TDM; TDMB; TDMH; TDML; TDR;
TDS; TDSH; TDSL
FS500; PRLB; PRLM; PRLS; TRB; TRM; TRS
(snap for
mounting
bases)
ASQU; ASTU; DSQU; DSTU
FIGURE 11
FIGURE 12
FIGURE 10
FS100; FS400
ERD3; ERDI; ERDM
www.ssac.com • 800-843-8848 • fax: 605-348-5685
ORB; ORM; ORS
inches (millimeters)
165

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