tekmar 152 User Manual

- Data Brochure

No power

D 152

Two Stage Setpoint Control 152

The tekmar Two Stage Setpoint Control 152 is a microprocessor-based control that 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.

Setpoint

HEAT

Delay

Differential

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

Gross Weight — 1 lb (450g) Ambient — -20 to 120 °F ( -30 to 50 °C)

Power supply — 24 V (ac) ± 10% 50/60 Hz 3 VA

Relay capacity — Sensor —10 kΩ @ 77°F (25° ± 0.2°C),

Control accuracy — ± 0.5° F ( ± 0.3°C) at

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

— 2-7/8" x 4-3/4" x 7/8"

(74 x 120 x 22 mm)

< 90% RH non-condensing

24 V (dc) ± 10% 0.03 A

240 V (ac) 10 A 1/3 hp

curve 3, NTC thermistor accurate with up to 500 ft. (150m) of 18 gauge wire

70°F (21°C)

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)

Hole for mounting screw

Meets Class B: Canadian ICES FCC Part 15

Made in Canada

tektra 906-03

Setpoint Differential Delay

Item

Two Stage Setpoint

2 Sensors

Control 152

3 4

–––

Power

Oﬀ

Relay 1 Rel ay 2

C– R+

Hole for mounting screw

Power: 24 V (ac) ± 10% 50/60 Hz 3 VA

24 V (dc) ± 10% 0.03A

Relay: 240 V (ac) 10 A 1/3 hp

Signal wiring must be rated at least 300 V.

56789

can be programmed

Temperature, Time delay and Differential Display

°C o r °F indicators

Cooling mode indicator

Programming and display buttons

Date Code

Sen

Wiring Chamber; Terminals for Sensor(s)

No power

Com

SenS1Sen

H1095F

12/08

with two

Sequence of Operation

• When the Two Stage Setpoint Control 152 is powered-up

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

2 Sensors

Dip Switch Up

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”

and shows the “HEAT” display element when the sensor temperature is (a) — 1/2 the differential setting below the setpoint,

(b) — the delay has timed out. When the

and

sensor temperature rises 1/2 the differential setting above the setpoint, the relay switches off and the delay starts to time out.

the digital display will show all of the display elements. The control

CONTROL RELAY (HEATING)

Desired temperature this example 160°F(71°C)

WarmerCooler

OFF ON

the control turns on the relay

Temperature

a r

155°F(68°C)

Time

Differential

this example

165°F(74°C)

10°F(5°C)

• If the control setpoints 1 and/or 2 are programmed for “Cool”

when the sensor temperature is (a) — 1/2 the differential setting above the setpoint,

the control turns on the relay and shows the “COOL” display element

(b) — the delay has timed out. When the

and

sensor temperature drops 1/2 the differential setting below the setpoint, the control switches its relay off and the delay starts to time out.

Single Sensor Mode

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.

2 Sensors

Dip Switch Down

Desired temperature this example 4 0 °F ( 4 °C )

WarmerCooler

Temperature

CONTROL RELAY (COOLING)

ON OFF

e r

t a r

35°F(2°C)

Time

T e

Programming Examples

off

79 °F + 1/2 diff 1

76 °F Setpoint 1

73 °F

-1/2 diff 1

70 °F +1/2 diff 2

68 °F Setpoint 2

66 °F

-1/2 diff 2

Stage 1

102 °F

+ 1/2 diff 1

100 °F

Setpoint 1

98 °F

-1/2 diff 1

2 Stage Heat

off

Control

Stage 2

off

99 °F + 1/2 diff 2

97 °F Setpoint 2

95 °F

- 1/2 diff 2

2 Stage Cool

Control

Stage 1

79 °F +1/2 diff 2

78 °F Setpoint 2

77 °F

off

-1/2 diff 2

81 °F

+ 1/2 diff 1

80 °F

Setpoint 1

79 °F

-1/2 diff 1

Stage 2

off

Heat/Cool

Control

Stage 1 Cool

minumum 3 °F

difference required

Stage 2 Heat

Differential

this example

1 0 °F ( 5 °C )

45°F(7°C)

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:

Other information available:

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

Mounting

The control is mounted in accordance with the instructions in the Data Brochure D 001.

Step Three

Rough-in wiring

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 trans-

former 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.

• One Control 152 • One Universal Sensor 071

• Data Brochure D 152 • Data Brochure D 001 • Data Brochure D 070 • Appl. Brochure A 152

• Essay E 001

Step Four

Testing and connecting the wiring

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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