Tekmar 150 User manual

- Data Brochure
One Stage Setpoint Control 150 07/93
D 150
HEAT
F
Setpoint Differential Delay/Cycle
ThetekmarOneStageSetpointControl150isamicroprocessor-basedcontrolthat canbeprogrammed
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
normallyshowstheactualsensortemperatureandcanbeusedtoviewthesetpointaswellastheother
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
CSensor
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
67
Power
12 34
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-Bangcontroloutputsturnequipmentonwhenthereisademandforheating
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)
Temperaturefall
CONTROL RELAY (HEATING)
OFF ON
Temperaturerise
Item
Identifiers
Hole for mounting screw
PWM
Dip Switch Down

Caution
Improperinstallationandoperationofthiscontrolcouldresultindamagetoequipmentandpossiblyevenpersonalinjury.
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
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 001 and run the wiring back to the control
but don’t connect.
• Install a 24 Vac Class II transformer with a minimum 5 VA rating close to the control, and run the wiring from the transformer
to the control. A Class II 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—200VoltsAC,andat least 0 — 2,000,000 Ohms, is essential to properly test this control. Atnotimeshouldvoltages
in excess of 28 Vac be measured at any of the wires connected to this control.
• Ifthecontrolisprogrammedfor“Heat” inthismode,therelayisoffaslongasthesensortemperatureis1/2 the differential setting
abovethesetpoint. Therelayiscontinuallyonwhenthesensortemperatureis1/2 thedifferentialbelowthesetpoint. Ifthesensor
temperature is between these two points, PWM action occurs. As more heat is required, the relay “on” time is increased and
the“off”timeisdecreasedwithineachcycle. Aslessheatisrequired,therelay“on”timeisdecreasedandthe“off”timeisincreased
within each cycle.
• Ifthe controlis programmedfor “Cool” inthis mode, therelay is continuallyon when thesensor temperature is1/2 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”timeisdecreasedwithineachcycle. Aslesscoolingisrequired,therelay“on”timeisdecreasedandthe“off”timeisincreased
within each cycle .
Caution— If PWM is selected, the minimum time delay is disabled.
•••
PWM Operating Mode
ThePulseWidthModulation(PWM)controloutputisanon/offaction,butdiffersfrom
the simple bang-bang by changing the length of the “on” time based on how much
the actual temperature differs from the desired temperature. With the advance to
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
operation is varied depending on “how much” heat is needed.
Desired temperature
this example
40°F(4°C)
Temperature
WarmerCooler
Time
Differential
this example
10°F(5°C)
45°F(7°C)
35°F(2°C)
Temperaturefall
CONTROL RELAY (COOLING)
ON OFF
Temperaturerise
RELAY ON
RELAY OFF
Pulse
Width
Desired temperature;
(Setting, this example
68°F) 19°C
PWM Zone;
(Differential Setting,
this example
4°F (2°C)
Cycle
length
Temperature
WarmerCooler
Time
T
e
m
p
e
r
a
t
ur
e
Heating
• If the control is programmed for “Cool” in this mode, it turns on its relay and
shows the “COOL” display element when the sensor temperature is (a) — 1/
2thedifferentialsettingabovethesetpoint, and (b)—thedelayhastimedout.
When the sensor temperature drops 1/2 the differential setting below the
setpoint, the relay switches off, the “COOL” display element turns off and the
delaystartstotimeout. Duringthetimeoutperiod,theDelay/Cyclepointerwill
flash if cooling is needed. PWM
Dip Switch Up
2
Installation

Push or to
change Delay/Cycle
Item
Item
Push or to select between
Fahrenheit or Celsius scales
The control automatically goes back to operating mode when the buttons are left alone for 20 secondsThe control automatically goes back to operating mode when the buttons are left alone for 20 seconds
PRGM
F
Setpoint
When the control is
powered-up, all display
elements turn on.
DISPLAY MODE
POWER ON
When in operating mode,
the measured temperature
will be displayed.
After approximately 5 seconds, the control
automatically goes into operating mode.
OPERATING MODE
Push or to
change Setpoint
Delay/Cycle
Push or to select between
Heating or Cooling operation
PRGM
HEAT COOL
PRGM
F
Item
Item
Push all three buttons at the
same time. "PRGM" will
appear and the Setpoint
pointer will flash. The control
will be in programming mode.
Pushing the "Item" button
changes the flashing pointer
to Differential
Pushing the "Item" button
allows Heating or Cooling
operation to be selected
Pushing the "Item" button
allows the Fahrenheit or
Celsius scale to be
selected
Push and Hold the
button. The programmed
Delay or PWM cycle
length will be displayed.
PROGRAM MODE
PRGM
F
Differential
C
PRGM
Delay/Cycle
Item
Pushing the "Item" button
changes the flashing pointer
to Delay / Cycle
Push and Hold the "Item"
button. The programmed
Heating or Cooling Setpoint
will be displayed.
Push and Hold the
button. The programmed
Differential will be
displayed.
F
Differential
Setpoint
F
Differential
HEAT COOL
FC
PRGM
Setpoint Delay/Cycle
Item
Item
Push or to
change Differential
Item
Setpoint Differential
F
Delay/Cycle
HEAT
HEAT
HEAT
3
Test the sensor
Thistest mustbe performed before power isapplied tothe controland before the sensoris connectedto theterminal 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.
Connect — the transformer to terminals C — R (1 and 2)
— the heating/cooling device circuit to terminals:
R
|
– N/O (3 + 4) is normally open (N/O) and closes when the relay turns on.
R
|
–N/C (3+ 5) is normally closed (N/C) andopens whenthe relay turns on.
Sensor connection Caution, voltage is never applied to these terminals
Connect the Universal Sensor 071 to terminals Sensor (6 and 7)
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.)
Settings
The following diagram illustrates how to operate the keypad buttons in order to view settings and program the control.
Max. 24 Volts
Do not apply
power here
24Vac
power
supply
Heating/Cooling
device circuit
1
C
2
R
34
8A
67
Sensor
071
Sensor
5
R' N/O N/C
8A

Differential (Bang - Bang)
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
toavoidshortcyclingofequipment. Experience,plustrialanderrorduringactualoperatingconditionsisusuallythewaymostinstallers
determine the correct differential setting.
Delay (Bang - Bang)
Settingthetimedelayalsodependsontheactualoperatingcharacteristicsofheating/coolingequipmentinaspecificapplication. With
someequipment,timedelaysare unnecessary andthedelaysettingcanbesettozerotimedelay. Othertypesof equipment depend
onafixed off delayto prevent damagetoequipment components, particularly inthe case ofcertaintypes of refrigerationequipment.
Consult the manufacturer's operating and installation instructions for advice on recommended time delays.
Differential (PWM)
TheDifferentialsettingdeterminesthetemperaturerangeinwhichPWMactionoccurs. ThissettingshouldbeadjustedtoallowPWM
action to occur the majority of the time. Cycle and Differential settings both affect relay “on” and “off” time.
Cycle (PWM)
Cycle provides the greatest control of how often the relay is turning on and off when the measured temperature is in the differential
range. IncreasingCyclewillcausetherelaytostayonandofflonger(whentemperatureremainsatsetpoint).Whencontrollingloads
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.
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.
In North America: tekmar Control Systems Ltd., Canada
tekmar Control Systems, Inc., U.S.A.
Head office: 4611 - 23rd Street
Vernon, B.C. Canada V1T 4K7
Tel. [phone] Fax. [phone]
All specifications are subject to change without notice.
Printed in Canada on recycled paper.
Product designs and literature are Copyright © 1993 by:
tekmar Control Systems Ltd. and tekmar Control Systems, Inc. 4
Limited Warranty: tekmar warrants to the original purchaser each tekmar product
againstdefects in workmanship andmaterialswhen the product isinstalledand used
incompliancewithtekmar'sinstructions. Thislimitedwarrantycoversthecostofparts
and labour provided by tekmar to correct defects in materials and/or workmanship.
Returned products that are fully operational are not considered a warranty case.
tekmaralso doesnotcover partsorlabour toremove,transport orreinstalla defective
product. tekmar will not be liable for any damage other than repair or replacement of
the defective part or parts and such repair or replacement shall be deemed to be the
sole remedy from tekmar. This warranty shall not apply to any defects caused or
repairs required as a result of unreasonable or negligent use, neglect, accident,
improper installation, or unauthorized repair or alterations. In case of defect,
malfunction or failure to conform to warranty, tekmar will, for a warranty period of 24
months from the date of invoice to the original purchaser or 12 months from the date
ofinstallation oftheproduct,whichever occursfirst,repair, exchangeorgivecredit for
thedefectiveproduct. Anyexpressorimpliedwarrantywhichthepurchasermayhave,
includingmerchantabilityandfitnessforaparticularpurpose, shallnotextendbeyond
24 months from the date of invoice or 12 months from the date of installation of the
product, whichever occurs first.
Replacements:tekmarcansendreplacementproductsifrequested. Allreplacements
are invoiced. Any possible credit for the replacement will only be issued once the
replaced product has been returned to tekmar.
ProductReturnProcedure:Productsthatarebelievedtohavefailedmustbe returned
to tekmar Control Systems Ltd. 4611-23 rd Street, Vernon B.C. Canada V1T 4K7
when agreed to by tekmar. The installer or other qualified service person must, at the
owner's expense, determine which component has failed. The product must be
returned complete with proof of purchase to the original purchaser who then returns
the product to tekmar after receiving a Return Goods Authorization (RGA) number
from tekmar.
Please include the following information with the product. The full address of the
original purchaser, the RGA number and a description of the problem.
From the U.S.A., in order to avoid customs charges, products must be returned via
USPostwiththe packageclearlymarked withtheRGAnumber,producttypeandthe
statement"CanadianProductreturnedforrepair". Forshippingpurposestheproduct
can be valued at one half list price.
1) If returned during the warranty period and the product is defective, tekmar will
issue full credit for the returned product less cost of missing parts.
2) Ifreturnedduringthe warrantyperiodand theproductisfullyoperational,tekmar
will return the product to the original purchaser for a testing cost of $30.00 plus
postage.
3) Ifreturnedduringthe warrantyperiodand theproductisnotdamagedandisfully
operational, tekmar can take back the product for a return charge of 40% of the
product's net value. This request has to be specified otherwise the product will be
returned with a testing cost of $30.00 plus postage.
4) If returned after the warranty period and the product needs repair, tekmar will
repair and return the product. Repair and postage costs will be invoiced. tekmar's
repair costs are calculated at $30.00 / hour plus the cost of parts. If the repair costs
will be more than $60.00 a repair estimate will be sent to the original purchaser.
Limited Warranty and Product Return Procedure
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
coverthesettingdialsandsnapitintoplace. • Placethisbrochure,andallotherbrochuresrelatingtotheinstallation,intheprotective
plasticbagsuppliedwiththecontrol. • Placethebaginaconspicuouslocationnearthecontrolforfuturereference. • Itisimportant
to explain the operation of this control within the system to the end user, and anyone else who may be operating the system.
Testing and Troubleshooting
PWM
Dip Switch Down
PWM
Dip Switch Up
PWM
Dip Switch Down
PWM
Dip Switch Up
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