Tekmar 150 - User Manual

- Data Brochure
One Stage Setpoint Control 150
07/93
D 150
HEAT
F
Setpoint
Differential
Delay/Cycle
The tekmar One Stage Setpoint Control 150 is a microprocessor-based control that can be programmed
to maintain a fixed setpoint temperature by cycling a heating or cooling device using either bang-bang
or Pulse Width Modulated (PWM) output control.
This reliable and versatile control has a very wide setpoint range, an adjustable differential and time
delay 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 setpoint as well as the other
programmed settings.
A Universal sensor 071 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 display will indicate a sensor fault whenever the
sensor is either open or short circuited.
Technical specifications
Dimensions
— 2-7/8" x 4-3/4" x 7/8"
(74 x 120 x 22 mm)
Gross Weight — 1 lb (450g)
Ambient — -20 to 120° F ( -30 to 50° C)
< 90% RH non-condensing
Power supply — 20 to 28Vac, 60 Hz, 3VA,
class II transformer
Relay capacity — SPDT, 24Vac, 8 amp resistive
Sensor — 10 kΩ @ 77°F (25° ± 0.2°C),
curve 3, NTC thermistor
accurate with up to 500 ft.
(150m) of 18 gauge wire
Control accuracy — ± 0.5° F ( ± 0.3°C) at 70°F
(21°C)
Settings
Temperature display — -85 to 302°F (-65 to 150°C)
Setpoint — -40 to 239°F (-40 to 115°C)
Differential (Bang/Bang) — 1 to 40°F (1 to 22°C)
Differential range (PWM) — 3 to 40°F (2 to 22°C)
Time delay (Bang/Bang) — 0 to 19 min. 50 sec.
(10 second increments)
Cycle length (PWM) — 30 sec. to 19 min. 50 sec.
(10 second increments)
Operating mode — Heating/Cooling
Temperature scale — Fahrenheit/Celsius
Programmed settings — Ten year memory
backup
• When the One Stage Setpoint Control 150 is powered-up the digital display will show all of the display elements. The control
will then monitor the sensor temperature and display it in the digital display. (See diagram)
Technical Data
One Stage Setpoint
Control 150
C
Sensor
Setpoint
Differential
Delay/Cycle
PRGM
HEAT COOL
FC
Item
Date
S/N
Power supply: 24V 60Hz 3VA
Relay capacity: 24V 8A
R
R'
24V only
No
Power
5
N/C
PWM
On
Off
6
7
Power
12
3
4
N/O
Hole for mounting screw
Wiring Chamber;
Terminals for
24Vac power
supply and
control circuit
for heating/
cooling device
Item
selection
and display
button
Wiring Chamber;
Terminals for
Sensor
°C or °F
indicators
Cooling mode
indicator
Programming
and display
buttons
Heating mode
indicator
Programming
mode indicator
Temperature,
Differential and
Delay/Cycle
Display
Bang - Bang Operating Mode
Bang-Bang control outputs turn equipment on when there is a demand for heating
or cooling, and then shut it completely off when the demand is satisfied.
• If the control is programmed for “Heat” in this mode, it turns on its relay and
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 , the “HEAT” display element turns off and the
delay starts to time out. During the time out period, the Delay/Cycle pointer
will flash if heating is needed.
Sequence of Operation
Desired temperature
this example
160°F(71°C)
Temperature
WarmerCooler
Time
Differential
this example
10°F(5°C)
165°F(74°C)
155°F(68°C)
T
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f
a
l
l
CONTROL RELAY (HEATING)
OFF ON
T
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Item
Identifiers
Hole for mounting screw
PWM
Dip Switch Down

Summary

Technical Data

Key Specifications

Physical, electrical, and environmental specifications of the control unit.

Settings Parameters

Configurable operational values like setpoint, differential, and time delay.

Sequence of Operation

Bang-Bang Mode

Control logic for simple on/off cycling of heating or cooling devices.

PWM Operating Mode

Control logic using Pulse Width Modulation for precise temperature regulation.

Installation Procedures

Preparation and Mounting

Steps for checking contents, mounting the control, and rough-in wiring.

Testing and Wiring

Final electrical testing and connection procedures.

Control Operation and Testing

Power Supply and Sensor Tests

Procedures for testing the power supply voltage and sensor functionality.

Electrical Connections

Details on connecting power supply, heating/cooling device, and sensor.

Programming and Display Modes

How to navigate display modes and enter the programming mode.

Advanced Settings and Troubleshooting

Differential and Delay Settings

Guidance on setting differential and time delay for Bang-Bang and PWM modes.

Testing and Troubleshooting

Troubleshooting sensor faults ('Err') and general operational issues.

Warranty and Returns

Information on the limited warranty, product returns, and procedures.

Tekmar 150 Specifications

General

Brand	Tekmar
Model	150
Category	Control Systems
Language	English