Tekmar 152 User manual

Two Sensor Operating Mode
When two sensors are used, sensor (S1) controls output relay 1 and sensor (S2)
controls output relay 2.
• Ifthecontrolsetpoint1and/or2isprogrammedfor “Heat” thecontrolturnsontherelay
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.
Two Stage Setpoint
Control 152
Setpoint Differential Delay
PRGM
HEAT COOL
FC
Item
Date
S/N
Power supply: 24V 60Hz 3VA
Relay capacity: 24V 10A
5
Relay 2
2 Sensors
On
Off
6
34
Relay 1
No Power
789
Com
Sen
S1
Sen
S2
Sen
1
2
24 V Only
21
CR
Power
Wiring Chamber;
Terminals for
Sensor(s)
°C or °F
indicators
Cooling mode
indicator
Programming and
display buttons
Temperature,
Time delay and
Differential
Display
Wiring Chamber;
Terminals for 24Vac
power supply and
control circuit
for heating/
cooling device(s)
- Data Brochure
Two Stage Setpoint Control 152 07/93
D 152
HEAT
F
Setpoint Differential Delay
1
ThetekmarTwoStageSetpointControl152isamicroprocessor-basedcontrolthat canbeprogrammed withtwo
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)bystandard18AWGlowvoltagewire. Thecontrolcanoperateasatwostagesetpointcontrolwithasingle
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
Settings
Temperature Display — -85to302°F(-65to150°C)
Setpoint 1 — -40to239°F(-40to115°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 — -40to239°F(-40to115°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
Hole for mounting screw
Hole for mounting screw
• 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)
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
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 — SPST, 24Vac, 10 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)
Programming
mode indicator
Heating mode
indicator
Item
identifiers
Item selection and
display button
2 Sensors
Dip Switch Up

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,andthecoolsetpointminus1/2itsdifferentialforoperation.Thisensuresthatthe
heating and cooling systems cannot operate at the same time.
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 VoltsAC,and atleast0 —2,000,000Ohms, isessentialto properlytestthis control. At notime should voltages
in excess of 28Vac be measured at any of the wires connected to this control.
2
Installation
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 152 includes: •One Control 152 • One Universal Sensor 071
• One Data Brochure D 152 • 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(s) 071 according to the instructions in Data Brochure D 001 and run the wiring back to the control
but do not connect.
• Install a 24Vac Class II transformer with a minimum 5VA 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(s) control circuit(s) to the appropriate relay on the control.
• 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
sensortemperaturedrops1/2thedifferentialsettingbelowthesetpoint,thecontrolswitchesitsrelayoffandthedelaystartstotime
out.
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
Programming Examples
2 Stage Cool
Control
Stage 2
79 °F
-1/2 diff 1
Stage 1
80 °F
Setpoint 1
off
on
81 °F
+ 1/2 diff 1
70 °F
+1/2 diff 2
66 °F
-1/2 diff 2
73 °F
-1/2 diff 1
76 °F
Setpoint 1
68 °F
Setpoint 2
off
off
on
on
79 °F
+ 1/2 diff 1
Heat/Cool
Control
Stage 2 Heat
Stage 1 Cool
minumum 3 °F
difference required
99 °F
+ 1/2 diff 2
95 °F
- 1/2 diff 2
Stage 2
97 °F
Setpoint 2
2 Stage Heat
Control
off
on
79 °F
+1/2 diff 2
77 °F
-1/2 diff 2
78 °F
Setpoint 2
off
on
102 °F
+ 1/2 diff 1
98 °F
-1/2 diff 1
Stage 1
100 °F
Setpoint 1
off
on
2 Sensors
Dip Switch Down

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 1 to terminals Relay 1 (3 and 4)
— the heating/cooling device circuit 2 to terminals Relay 2 (5 and 6)
Sensor connection(s) — Caution, voltage is never applied to these terminals
Connect: Sensor 071 to terminals S1 Sen and Com (7 and 8)
Sensor 071 to terminals S2 Sen and Com (7 and 9) Optional
3
Test the sensor (s)
This test must be performed
before power is applied to the control and before a sensor is connected to the terminal strip. Test
the sensor(s) 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.
The digital display on the Two Stage Setpoint Control 152 has the following uses:
• To display the actual temperature(s) 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 either relay closes to operate a heat source and "COOL"
display element comes on when either relay closes to operate a cooling device.)
• Todisplaysensorfaults. (Displaywillshow"Err"whenasensoriseitherdisconnected, shortcircuitedoroutoftemperaturerange.)
• To display program faults. (Display will show "Prgm Err" when the “Heat/Cool” single sensor mode is incorrectly programmed.)
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
Heating/Cooling
device circuit #2
1
C
2
R
34
10A 10A
Relay 1 Relay 2
567
Com
Sen S1
Sen S2
Sen
89
Sensor
#1 (071) Sensor
#2 (071)
Power
Settings
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
Item
Item
Item
Item
Item
Item
Push or to
change Differential
Push or to
change Delay
Push or to select between
Heating or Cooling operation
Item
Push or to
change Setpoint
Item
Push or to
change Setpoint
Item
Push or to
change Differential
Item
Item
Push or to
change Delay
Item
Push or to select between
Heating or Cooling operation
Item
Push or to select between
Fahrenheit or Celsius scales
2 Sensors
Dip Switch Up
If two sensors are are in use.
PROGRAM MODE
Pushing the "Item" button,
"PRGM 2" appears, and the
Setpoint (2) pointer will
flash.
PRGM
F
Setpoint
When the control is
powered-up, all display
elements turn on.
DISPLAY MODE
POWER ON
When in operating mode,
the actual sensor
temperature(s) are
displayed.
After approximately 5 seconds, the control
automatically goes into operating mode.
OPERATING MODE
Push and Release the
"Item" button. The display
will toggle between sensor
1 and 2.
1
Delay
1
PRGM
COOL
PRGM
F
Differential
2
PRGM
FC
1
Push all three buttons at the
same time. "PRGM 1" will
appear and the Setpoint (1)
pointer will flash. The control
will be in programming mode.
Pushing the "Item"
button changes the
flashing pointer to
Differential (1)
Pushing the "Item" button
changes the flashing pointer
to Delay (1)
Pushing the "Item" button
allows Heating or Cooling (1)
operation to be selected
Pushing the "Item" button
allows the Fahrenheit or
Celsius scale to be
selected
Pushing the "Item" button
changes the flashing pointer
to Differential (2)
Pushing the "Item" button
changes the flashing pointer
to Delay (2)
Pushing the "Item" button
allows Heating or Cooling
(2) operation to be selected
Push and Hold the "Item"
button. The programmed
Setpoint 1 and then
Setpoint 2 will be displayed.
Push and Hold the
button. The programmed
Differential 1 and then
Differential 2 will be
displayed.
Push and Hold the
button. The programmed
Delay 1 and then Delay 2
will be displayed.
Setpoint
F
1
HEAT COOL
FC
1
PRGM
F
Differential
1
PRGM
Delay
1
PRGM
Delay
2
PRGM
HEAT COOL
2
F
Differential
1
PRGM
HEAT COOL
FC
Setpoint Differential Delay
1
2
PRGM
F
Setpoint
2
F
2
F
HEAT
COOL
COOL
COOL

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
Differential
Setting the Differential on any control depends entirely on the actual operating characteristics of heating/cooling equipment in a
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
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.
Limited Warranty: tekmar warrants to the original purchaser each
tekmar product against defects in workmanship and materials when the
product is installed and used in compliance with tekmar's instructions.
This limited warranty covers the cost of parts 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.
tekmaralsodoesnotcoverpartsorlabourtoremove,transportorreinstall
a 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 of installation of the product, whichever occurs
first,repair,exchangeorgivecreditforthedefectiveproduct. Anyexpress
or implied warranty which the purchaser may have, including
merchantability and fitness for a particular purpose, shall not extend
beyond 24 months from the date of invoice or 12 months from the date of
installation of the product, whichever occurs first.
Replacements: tekmarcansend replacementproducts ifrequested. All
replacements are invoiced. Any possible credit for the replacement will
only be issued once the replaced product has been returned to tekmar.
Product Return Procedure: Products that are believed to have failed
must be returned to tekmar Control Systems Ltd. 4611-23rd 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 all of its components (sensors,
base, etc.). Products must be returned together with the proof of
purchasetotheoriginalpurchaserwhothenreturnstheproducttotekmar
afterreceivingaReturnGoodsAuthorization(RGA)numberfromtekmar.
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 US Post with the package clearly marked with the RGA
number, product type and the statement "Canadian Product returned for
repair". For shipping purposes the product 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) If returned during the warranty period and the product is fully opera-
tional,tekmar willreturntheproductto theoriginalpurchaserfora testing
cost of $30.00 plus postage.
3) Ifreturnedduringthewarrantyperiod andthe productisnotdamaged
and is fully operational, tekmar can take back the product for a return
chargeof40%oftheproduct'snetvalue. Thisrequesthastobespecified
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
beinvoiced. tekmar'srepaircostsarecalculatedat$30.00/hourplus the
costofparts. Iftherepaircostswillbemorethan$60.00 arepairestimate
will be sent to the original purchaser.
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.
If troubleshooting becomes necessary with the Two Stage Setpoint Control 152, follow the testing procedure in step four of the
installation procedure on page 2 of this brochure.
If the display window shows “Err 1” or “Err 2”, sensor (S1) or (S2) is either open circuited, 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 relays in order to shut down the
heating or cooling equipment it is controlling.
If the display window flashes “prgm Err” when using a single sensor, the “heat/cool” differential setting is to small. Check setpoints
anddifferentialstoensure that atleast3°Fexists between theheatingsetpointplus1/2 its differentialandthecoolingsetpoint minus
1/2 its differential.
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(s) is located in the correct location.
Testing and Troubleshooting
Limited Warranty and Product Return Procedure