- Data Brochure D 150

One Stage Setpoint Control 150 12/08

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
F

HEAT

Setpoint Differential Delay/Cycle

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 Data
Technical specifications
Dimensions — 2-7/8" x 4-3/4" x 7/8” Hole for mounting screw
(74 x 120 x 22 mm)
Gross Weight — 1 lb (450g)
Ambient — -20 to 120°F (-30 to 50°C) Programming Temperature,
<90 % RH non-condensing mode indicator Differential and
Power supply — 24 V (ac) ±10%, 50/60 Hz, 1.3 VA Delay/Cycle
24 V (dc) ±10% 0.02 A Display
Relay — 240 V (ac) 8 A 1/4 hp
Sensor — 10 kΩ @77°F (25° ± 0.2°C), °C or °F
curve 3, NTC thermistor Heating mode PRGM F C indicators
accurate with up to 500 ft. indicator
HEAT COOL
(150m) of 18 gauge wire Cooling mode
Control accuracy — ±0.5°F (±0.3°C) at 70°F (21°C) Item indicator
Identifiers
Settings
Temperature display — -85 to 302°F (-65 to 150°C) Item Programming
Setpoint — -40 to 239°F (-40 to 115°C) Item and display
Differential (Bang/Bang) — 1 to 40°F (1 to 22°C) selection buttons
Differential range (PWM) — 3 to 40°F (2 to 22°C) and display
Time delay (Bang/Bang) — 0 to 19 min. 50 sec. button
(10 second increments)
Cycle length (PWM) — 30 sec. to 19 min. 50 sec. Wiring Chamber;
Terminals for
(10 second increments)
24Vac power Wiring Chamber;
Operating mode — Heating/Cooling supply and Terminals for
Temperature scale — Fahrenheit/Celsius control circuit Sensor
Programmed settings — Ten year memory for heating/
backup cooling device
Hole for mounting screw

Sequence of Operation
• 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)
PWM
Bang - Bang Operating Mode
Dip Switch Down
Bang-Bang control outputs turn equipment on when there is a demand for heating
CONTROL RELAY (HEATING) Differential
or cooling, and then shut it completely off when the demand is satisfied. Desired temperature OFF ON this example
10°F(5°C)
Warmer

this example
• If the control is programmed for “Heat” in this mode, it turns on its relay and 160°F(71°C)
rise

165°F(74°C)
Temperature

the “HEAT” display element when the sensor temperature is (a) — 1/2 the
ure

Tem
rat

differential setting below the setpoint, and (b) — the delay has timed out.
per
pe
Tem

atu

When the sensor temperature rises 1/2 the differential setting above the
re

155°F(68°C)
setpoint, the relay switches off , the “HEAT” display element turns off and the
fall
Cooler

delay starts to time out. During the time out period, the Delay/Cycle pointer Time
will flash if heating is needed.
 • If the control is programmed for “Cool” in this mode, it turns on its relay and CONTROL RELAY (COOLING) Differential
this example
Desired temperature ON OFF
shows the “COOL” display element when the sensor temperature is (a) — 1/

Warmer
10°F(5°C)
this example
40°F(4°C)

rise
2 the differential setting above the setpoint, and (b) — the delay has timed out. 45°F(7°C)

Temperature

re
When the sensor temperature drops 1/2 the differential setting below the

Tem
atu
per

per
setpoint, the relay switches off, the “COOL” display element turns off and the

Tem

atu
delay starts to time out. During the time out period, the Delay/Cycle pointer will

re f
35°F(2°C)

Cooler

all
flash if cooling is needed.
PWM
Time
PWM Operating Mode
Dip Switch Up Desired temperature; PWM Zone;
Pulse
(Setting, this example (Differential Setting,
Width

Warmer
68° F) 19°C this example
The Pulse Width Modulation (PWM) control output is an on/off action, but differs from RELAY OFF 4°F (2°C)

the simple bang-bang by changing the length of the “on” time based on how much

Temperature
Heating
the actual temperature differs from the desired temperature. With the advance to Temperature

PWM output, overshoot and undershoot is reduced by adding a quantity based

function. The heating device is not simply operated “when” heat is needed but the

Cooler
operation is varied depending on “how much” heat is needed. RELAY ON
Cycle
length
Time

• If the control is programmed for “Heat” in this mode, the relay is off as long as the sensor temperature is 1/2 the differential setting
above the setpoint. The relay is continually on when the sensor temperature is 1/2 the differential below the setpoint. If the sensor
temperature is between these two points, PWM action occurs. As more heat is required, the relay “on” time is increased and
the “off” time is decreased within each cycle. As less heat is required, the relay “on” time is decreased and the “off” time is increased
within each cycle.
• If the control is programmed for “Cool” in this mode, the relay is continually on when the sensor temperature is 1/2 the differential
setting above the setpoint. The relay is off when the sensor temperature is 1/2 the differential below the setpoint. If the sensor
temperature is between these two points, PWM action occurs. As more cooling is required, the relay “on” time is increased and
the “off” time is decreased within each cycle. As less cooling is required, the relay “on” time is decreased and the “off” time is increased
within each cycle .
Caution — If PWM is selected, the minimum time delay is disabled.

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 150 includes: • One Control 150 • One Universal Sensor 071
• One Data Brochure D 150 • One Data Brochure D 001 • One Data Brochure D 070
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 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 071, according to the instructions in Data Brochure D 070 and run the wiring back to the control
but don’t connect.
• Install a 24 V (ac) Class 2 transformer with a minimum 5 VA rating close to the control, and run the wiring from the transformer
to the control. 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 control circuit to the control.

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 28 V (ac) be measured at any of the wires connected to this control.
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 Test the sensor
This test must be performed before power is applied to the control and before the sensor is connected to the terminal strip. Test
the sensor according to the instructions printed in the enclosed Data Brochure D 001.

Test the power supply

• Ensure that the wires from the power supply transformer are not touching each other, any other wires, or ground. Turn on the
power and, using an AC voltmeter, you should measure between 20 and 28 volts at the secondary side of the transformer.

• Turn off the power and complete the electrical connections to the terminal strip of the control.

Electrical connections

Power and output connections — Caution, Maximum 24 Volts A.C.

Max. 24 8A 8A
Do not apply
Connect — the transformer to terminals C — R (1 and 2) Volts power here
— the heating/cooling device circuit to terminals: 1 2 3 4 5 6 7
R| – N/O (3 + 4) is normally open (N/O) and closes when the relay turns on. C R R' N/O N/C Sensor
R| – N/C (3 + 5) is normally closed (N/C) and opens when the relay turns on.
24 V Sensor
Heating/Cooling
Sensor connection Caution, voltage is never applied to these terminals power
supply device circuit 071

Connect the Universal Sensor 071 to terminals Sensor (6 and 7)

Settings
The digital display on the One Stage Setpoint Control 150 has the following uses:
• To display the actual temperature during normal operating mode.
• To allow the user to view and program the various control settings.
• To display control operation. (“HEAT” display element comes on when the relay closes to operate a heat source and “COOL”
display element comes on when the relay closes to operate a cooling device.)
• To display sensor faults. (Display will show “Err” when the sensor is either open or short circuited.)
The following diagram illustrates how to operate the keypad buttons in order to view settings and program the control.

POWER ON
When the control is Push and Hold the Pushing the "Item" button
powered-up, all display PRGM F C button. The programmed allows Heating or Cooling PRGM
elements turn on. HEAT COOL
Delay or PWM cycle operation to be selected
HEAT HEAT COOL
length will be displayed.
Setpoint Differential Delay/Cycle
Delay/Cycle Item Push or to select between
After approximately 5 seconds, the control Heating or Cooling operation
Item
automatically goes into operating mode.

OPERATING MODE PROGRAM MODE

Push all three buttons at the Pushing the "Item" button
When in operating mode, same time. "PRGM" will allows the Fahrenheit or
PRGM F F C
the measured temperature F PRGM
appear and the Setpoint Celsius scale to be
will be displayed. pointer will flash. The control selected
will be in programming mode.
Setpoint
Setpoint Differential Delay/Cycle Push or to select between
Push or to Item Fahrenheit or Celsius scales
change Setpoint
Item

DISPLAY MODE
Push and Hold the "Item" Pushing the "Item" button
button. The programmed F changes the flashing pointer PRGM F
Heating or Cooling Setpoint to Differential
HEAT
will be displayed.
Setpoint Differential

Item Push or to
Item change Differential

Push and Hold the Pushing the "Item" button

button. The programmed F changes the flashing pointer PRGM
Differential will be to Delay / Cycle
HEAT
displayed.
Differential Item Delay/Cycle
Push or to
change Delay/Cycle
Item

The control automatically goes back to operating mode when the buttons are left alone for 20 seconds

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 PWM
Differential (Bang - Bang)
Dip Switch Down
Setting the Differential on any control depends entirely on the actual operating characteristics of heating/cooling equipment in each
specific application. Differential settings should normally be set as small as possible for greatest accuracy, but care must be taken
to avoid short cycling of equipment. Experience, plus trial and error during actual operating conditions is usually the way most installers
determine the correct differential setting.
PWM
Delay (Bang - Bang)
Dip Switch Down
Setting the time delay also depends on the actual operating characteristics of heating/cooling equipment in a specific application. With
some equipment, time delays are unnecessary and the delay setting can be set to zero time delay. Other types of equipment depend
on a fixed off delay to prevent damage to equipment components, particularly in the case of certain types of refrigeration equipment.
Consult the manufacturer's operating and installation instructions for advice on recommended time delays.
PWM
Differential (PWM)
Dip Switch Up
The Differential setting determines the temperature range in which PWM action occurs. This setting should be adjusted to allow PWM
action to occur the majority of the time. Cycle and Differential settings both affect relay “on” and “off” time.
PWM
Cycle (PWM)
Dip Switch Up
Cycle provides the greatest control of how often the relay is turning on and off when the measured temperature is in the differential
range. Increasing Cycle will cause the relay to stay on and off longer ( when temperature remains at setpoint). When controlling loads
that respond slowly to the heating/cooling input, the Cycle should be long. When loads respond quickly to heating/cooling input, a
short Cycle is used.

Testing and Troubleshooting

If troubleshooting becomes necessary with the One Stage Setpoint Control 150, follow the testing procedure in step four of the
installation procedure on page 2 of this brochure.
If the display window shows “Err”, the sensor is either open or short circuited, or the sensor temperature is outside the temperature
range of the control. If this type of fault occurs, the control will turn off its relay.
If you do not think the control is operating properly, check to see that the settings have been made correctly and that the problem is
not a result of external causes. Make sure that all wiring connections are solid and the sensor is located in the correct location.
Before you leave
• Install the wiring cover over the wiring chamber and secure it with the screw provided. • Place the front cover on the control to
cover the setting dials and snap it into place. • Place this brochure, and all other brochures relating to the installation, in the protective
plastic bag supplied with the control. • Place the bag in a conspicuous location near the control for future reference. • It is important
to explain the operation of this control within the system to the end user, and anyone else who may be operating the system.

Limited Warranty and Product Return Procedure

Limited Warranty The liability of tekmar under this warranty is limited. The Purchaser, by Any representations or warranties about the Products made by Purchaser to its customers
taking receipt of any tekmar product (“Product”), acknowledges the terms of the Limited which are different from or in excess of the tekmar Limited Warranty are the Purchaser’s sole
Warranty in effect at the time of such Product sale and acknowledges that it has read and responsibility and obligation. Purchaser shall indemnify and hold tekmar harmless from and
understands same. against any and all claims, liabilities and damages of any kind or nature which arise out of
The tekmar Limited Warranty to the Purchaser on the Products sold hereunder is a or are related to any such representations or warranties by Purchaser to its customers.
manufacturer’s pass-through warranty which the Purchaser is authorized to pass through to The pass-through Limited Warranty does not apply if the returned Product has been
its customers. Under the Limited Warranty, each tekmar Product is warranted against damaged by negligence by persons other than tekmar, accident, fire, Act of God, abuse or
defects in workmanship and materials if the Product is installed and used in compliance with misuse; or has been damaged by modifications, alterations or attachments made
tekmar’s instructions, ordinary wear and tear excepted. The pass-through warranty period is subsequent to purchase which have not been authorized by tekmar; or if the Product was
for a period of twenty-four (24) months from the production date if the Product is not installed not installed in compliance with tekmar’s instructions and / or the local codes and
during that period, or twelve (12) months from the documented date of installation if installed ordinances; or if due to defective installation of the Product; or if the Product was not used
within twenty-four (24) months from the production date. in compliance with tekmar’s instructions.
The liability of tekmar under the Limited Warranty shall be limited to, at tekmar’s sole THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED,
discretion: the cost of parts and labor provided by tekmar to repair defects in materials and WHICH THE GOVERNING LAW ALLOWS PARTIES TO CONTRACTUALLY EXCLUDE,
/ or workmanship of the defective product; or to the exchange of the defective product for a INCLUDING, WITHOUT LIMITATION, IMPLIED WARRANTIES OF MERCHANTABILITY
warranty replacement product; or to the granting of credit limited to the original cost of the AND FITNESS FOR A PARTICULAR PURPOSE, DURABILITY OR DESCRIPTION OF
defective product, and such repair, exchange or credit shall be the sole remedy available THE PRODUCT, ITS NON-INFRINGEMENT OF ANY RELEVANT PATENTS OR TRADE-
from tekmar, and, without limiting the foregoing in any way, tekmar is not responsible, in MARKS, AND ITS COMPLIANCE WITH OR NON-VIOLATION OF ANY APPLICABLE
contract, tort or strict product liability, for any other losses, costs, expenses, inconveniences, ENVIRONMENTAL, HEALTH OR SAFETY LEGISLATION; THE TERM OF ANY OTHER
or damages, whether direct, indirect, special, secondary, incidental or consequential, arising WARRANTY NOT HEREBY CONTRACTUALLY EXCLUDED IS LIMITED SUCH THAT IT
from ownership or use of the product, or from defects in workmanship or materials, including SHALL NOT EXTEND BEYOND TWENTY-FOUR (24) MONTHS FROM THE PRODUC-
any liability for fundamental breach of contract. TION DATE, TO THE EXTENT THAT SUCH LIMITATION IS ALLOWED BY THE GOVERN-
The pass-through Limited Warranty applies only to those defective Products returned to ING LAW.
tekmar during the warranty period. This Limited Warranty does not cover the cost of the Product Warranty Return Procedure All Products that are believed to have defects in
parts or labor to remove or transport the defective Product, or to reinstall the repaired or workmanship or materials must be returned, together with a written description of the defect,
replacement Product, all such costs and expenses being subject to Purchaser’s agreement to the tekmar Representative assigned to the territory in which such Product is located. If
and warranty with its customers. tekmar receives an inquiry from someone other than a tekmar Representative, including an
inquiry from Purchaser (if not a tekmar Representative) or Purchaser’s customers,
regarding a potential warranty claim, tekmar’s sole obligation shall be to provide the address
and other contact information regarding the appropriate Representative.

In North America: tekmar Control Systems Ltd., Canada

tekmar Control Systems, Inc., U.S.A.
Head office: 5100 Silver Star Road
Vernon, B.C. Canada V1B 3K4
Tel. (250) 545-7749 Fax. (250) 545-0650
Product designs and literature are Copyright © 2008 by: All specifications are subject to change without notice.
tekmar Control Systems Ltd. and tekmar Control Systems, Inc. Printed in Canada. D 150 - 12/08.
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