- Data Brochure |
D 152 |
Two Stage Setpoint Control 152 |
12/08 |
1
F
HEAT
Setpoint |
Differential |
Delay |
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 makes it useable in many different applications. The control has a digital LCD window that normally shows the actual sensor temperature and can be used to view the setpoints and other programmed settings.
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" |
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(74 x 120 x 22 mm) |
Gross Weight |
— 1 lb (450g) |
Ambient |
— -20 to 120 °F ( -30 to 50 °C) |
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< 90% RH non-condensing |
Power supply |
— 24 V (ac) ± 10% 50/60 Hz 3 VA |
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24 V (dc) ± 10% 0.03 A |
Relay capacity |
— 240 V (ac) 10 A 1/3 hp |
Sensor |
—10 kΩ @ 77°F (25°± 0.2°C), |
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curve 3, NTC thermistor |
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accurate with up to 500 ft. |
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(150m) of 18 gauge wire |
Control accuracy |
— ± 0.5°F ( ± 0.3°C) at |
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70°F (21°C) |
Programming mode indicator
Heating mode indicator
Item identifiers
Settings |
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Temperature Display |
— -85 to 302°F (-65 to 150°C) |
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Setpoint 1 |
— -40 to 239°F (-40 to 115°C) |
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Differential 1 |
— 1 to 40°F (1 to 22°C) |
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Time delay 1 |
— 0 to 19 min 50 sec |
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Operating mode 1 |
— Heating/Cooling |
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Setpoint 2 |
— -40 to 239°F (-40 to 115°C) |
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Differential 2 |
— 1 to 40°F (1 to 22°C) |
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Time delay 2 |
— 0 to 19 min 50 sec |
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Operating mode 2 |
— Heating/Cooling |
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Temperature scale |
— Fahrenheit/Celsius |
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Programmed settings |
— Ten year memory backup |
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Item selection and display button
Wiring Chamber; Terminals for 24Vac power supply and control circuit for heating/
cooling device(s)
Hole for mounting screw
Meets Class B: |
Power: 24 V (ac) ± 10% 50/60 Hz 3 VA |
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24 V (dc) ± 10% 0.03A |
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Canadian ICES |
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Relay: 240 V (ac) 10 A 1/3 hp |
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FCC Part 15 |
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Made in Canada |
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H1095F |
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tektra 906-03 |
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Setpoint |
Differential |
Delay |
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Item |
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DateCode |
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2Sensors |
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Control 152 |
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Two Stage Setpoint |
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No power |
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–––On |
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Signal wiring |
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Power |
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must be rated |
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Relay 1 |
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at least 300 V. |
Relay 2 |
Sen |
Sen |
Sen |
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Hole for mounting screw
Temperature, Time delay and Differential Display
°C or °F indicators
Cooling mode indicator
Programming and display buttons
Wiring Chamber; Terminals for Sensor(s)
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) |
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2 Sensors |
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Two Sensor Operating Mode |
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Dip Switch Up |
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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.
Cooler Temperature Warmer
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CONTROL RELAY (HEATING) |
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Differential |
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Desired temperature |
OFF |
ON |
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this example |
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10°F(5°C) |
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this example |
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160°F(71°C) |
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165°F(74°C) |
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155°F(68°C) |
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Time
•If the control setpoints 1 and/or 2 are programmed for “Cool” the control turns on the relay and shows the “COOL” display element when the sensor temperature is (a) — 1/2 the differential setting above the setpoint, and (b) — the delay has timed out. When the sensor temperature drops 1/2 the differential setting below the setpoint, the control switches its relay off and the delay starts to time
out.
2 Sensors
Single Sensor Mode
Dip Switch Down
When using a single sensor, the sensor controls the action of both output relays. Any combination of “HEAT/HEAT” , “HEAT/COOL”, “COOL/COOL” may be utilized. When using the Two Stage Setpoint Control 152 in a “HEAT/COOL” installation with only a single sensor, a 3 °F difference must be programmed between the heat setpoint plus 1/2 its differential, and the cool setpoint minus 1/2 its differential for operation. This ensures that the heating and cooling systems cannot operate at the same time.
Programming Examples
Cooler Temperature Warmer
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CONTROL RELAY (COOLING) |
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Differential |
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Desired temperature |
ON |
OFF |
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this example |
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10°F(5°C) |
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40°F(4°C) |
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45°F(7°C) |
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35°F(2°C) |
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Time
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2 Stage Heat |
2 Stage Cool |
Stage 2 |
Heat/Cool |
on |
79 °F |
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Stage 1 |
off |
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Control |
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Control |
Control |
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+ 1/2 diff 1 |
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on |
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76 °F |
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102 °F |
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81 °F |
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+ 1/2 diff 1 |
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+ 1/2 diff 1 |
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Stage 1 Cool |
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Setpoint 1 |
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Stage 2 |
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73 °F |
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100 °F |
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off |
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Stage 1 |
80 °F |
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minumum 3 °F |
off |
-1/2 diff 1 |
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Setpoint 1 |
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99 °F |
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Setpoint 1 |
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on |
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difference required |
off |
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98 °F |
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+ 1/2 diff 2 |
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79 °F |
79 °F |
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70 °F |
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-1/2 diff 1 |
on |
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97 °F |
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+1/2 diff 2 |
-1/2 diff 1 |
off |
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+1/2 diff 2 |
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Setpoint 2 |
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78 °F |
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68 °F |
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95 °F |
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Setpoint 2 |
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Stage 2 Heat |
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Setpoint 2 |
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on |
- 1/2 diff 2 |
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77 °F |
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66 °F |
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off |
-1/2 diff 2 |
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on |
-1/2 diff 2 |
Installation
Caution
Improper installation and operation of this control could result in damage to equipment and possibly even personal injury. It is your responsibility to ensure that this control is safely installed according to all applicable codes and standards.
Step One Getting ready
Check the contents of this package. If any of the contents listed are missing or damaged, please refer to the Limited Warranty and Product Return Procedure on the back of this brochure and contact your wholesaler or tekmar sales agent for assistance.
Type 152 includes: |
• One Control 152 • One Universal Sensor 071 |
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• Data Brochure D 152 • Data Brochure D 001 • Data Brochure D 070 • Appl. Brochure A 152 |
Other information available: • Essay E 001
Note: Carefully read the Sequence of Operation section in this brochure to ensure that you have chosen the proper control and understand its functions within the operational requirements of your system.
Step Two |
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Mounting |
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The control is mounted in accordance with the instructions in the Data Brochure D 001. |
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Step Three |
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Rough-in wiring |
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All electrical wiring terminates in the two wiring chambers at the bottom front of the control. If the control is to be mounted on an electrical box, the wiring can be roughed-in at the electrical box prior to installation of the control (see Brochure D 001). Standard 18 AWG solid wire is recommended for all low voltage wiring to this control.
Caution: Power should not be applied to any of the wires during this rough-in wiring stage.
•Install the Universal Sensor(s) 071 according to the instructions in Data Brochure D 070 and run the wiring back to the control but do not connect.
•Install a 24 V power supply, and run the wiring from the power supply to the control with 24 V (ac) power. A Class 2 transformer must be used. Do not connect any of the transformer terminals to ground.
•Install the wiring from the heating/cooling device(s) control circuit(s) to the appropriate relay on the control.
Step Four |
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Testing and connecting the wiring |
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Caution
These tests are to be performed using standard testing practices and procedures and should only be carried out by a properly trained and experienced technician. A good quality electrical test meter, capable of reading from at least 0 — 200 Volts AC, and at least 0 — 2,000,000 Ohms, is essential to properly test this control. At no time should voltages in excess of 28Vac be measured at any of the wires connected to this control.
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