Tekmar 152 Data Brochure

- Data Brochure
Two Stage Setpoint Control 152
The tekmar Two Stage Setpoint Control 152 is a microprocessor-based control that can be programmed with two
independent setpoint temperatures to cycle heating or cooling devices on and off.
This reliable and versatile control has adjustable differentials, time delays, and a very wide setpoint range that
F
makes it useable in many different applications. The control has a digital LCD window that normally shows the
1
HEAT
actual sensor temperature and can be used to view the setpoints and other programmed settings.
Setpoint Differential Delay
A Universal Sensor 071 sensor is supplied with the control. The wire to the sensor may be extended up to 500 ft.
(150m) by standard 18 AWG low voltage wire. The control can operate as a two stage setpoint control with a single
sensor connected or as two independent one stage setpoint controls with two sensors connected. The display
will indicate a sensor fault whenever a sensor is either open or short circuited.
Technical Data
Technical specifications
Dimensions — 2-7/8" x 4-3/4" x 7/8"
(74 x 120 x 22 mm)
Gross Weight — 1 lb (450g)
— -20 to 120 °F ( -30 to 50 °C)
Ambient
< 90% RH non-condensing
Power supply — 20 to 28Vac, 60 Hz, 3VA,
class II transformer
Relay capacity — SPST, 24Vac, 10 amp resistive
—10 kΩ @ 77°F (25° ± 0.2°C),
Sensor
curve 3, NTC thermistor
accurate with up to 500 ft.
(150m) of 18 gauge wire
— ± 0.5° F ( ± 0.3°C) at
Control accuracy
70°F (21°C)
Settings
Temperature Display — -85 to 302°F (-65 to 150°C)
Setpoint 1 — -40 to 239°F (-40 to 115°C)
Differential 1 — 1 to 40°F (1 to 22°C)
Time delay 1 — 0 to 19 min 50 sec
Operating mode 1 — Heating/Cooling
Setpoint 2 — -40 to 239°F (-40 to 115°C)
Differential 2 — 1 to 40°F (1 to 22°C)
Time delay 2 — 0 to 19 min 50 sec
Operating mode 2 — Heating/Cooling
Temperature scale — Fahrenheit/Celsius
Programmed settings — Ten year memory backup
Sequence of Operation
• When the Two Stage Setpoint Control 152 is powered-up the digital display will show all of the display elements. The control
will then monitor either sensor (S1) or sensor (S2) temperature and display the temperature on the digital display. Pressing
and releasing the Item button will toggle between the sensor (S1) and sensor (S2) temperature readings when two sensors
are used. (See diagram)
Two Sensor Operating Mode
When two sensors are used, sensor (S1) controls output relay 1 and sensor (S2)
controls output relay 2.
• If the control setpoint 1 and/or 2 is programmed for "Heat" the control turns on the relay
and shows the "HEAT" display element when the sensor temperature is (a) — 1/2 the
differential setting below the setpoint, and (b) — the delay has timed out. When the
sensor temperature rises 1/2 the differential setting above the setpoint, the relay
switches off and the delay starts to time out.
Programming
mode indicator
Heating mode
indicator
Item
identifiers
Item selection and
display button
Wiring Chamber;
Terminals for 24Vac
power supply and
control circuit
for heating/
cooling device(s)
2 Sensors
Dip Switch Up
Hole for mounting screw
Date
S/N
Two Stage Setpoint
Control 152
F C
PRGM 1
2
HEAT COOL
Setpoint Differential Delay
Item
Power supply: 24V 60Hz 3VA
2 Sensors Relay capacity: 24V 10A
24 V Only
6
1 2 3 4 5
On
Power Com
Off C R Relay 1
Relay 2
Hole for mounting screw
Desired temperature
this example
160°F(71°C)
D 152
07/93
Temperature,
Time delay and
Differential
Display
°C or °F
indicators
Cooling mode
indicator
Programming and
display buttons
No Power
7 8 9
S2
S1
Sen Sen Sen
Wiring Chamber;
Terminals for
Sensor(s)
CONTROL RELAY (HEATING) Differential
this example
OFF ON
10°F(5°C)
165°F(74°C)
155°F(68°C)
Time