Watts Tekmar 077 User manual

Installation & Operation Manual
Indoor Sensor 077
The tekmar Indoor Sensor 077
includes a 10 kΩ thermistor mount-
ed on a white enamel steel plate to
provide an accurate measurement
of the indoor temperature. The 077
can be mounted flush onto a stan-
dard duplex electrical box. Wiring
enters from the back. The 077
can be connected to a 10k Room
Temperature Unit (RTU) for remote
temperature sensing.

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077_D 2051 © 2020 tekmar Control Systems Ltd.
Table of Contents
Important Safety Information.......................................... 3
STEP 1: Check the Contents. ........................................ 4
STEP 2: Choose a Location .......................................... 4
STEP 3: Wiring the Indoor Sensor ......................................5
STEP 4: Installing the Sensor Front Cover ................................5
Sensor Testing Instructions .......................................... 6
Resistance Table .................................................. 6
Technical Data .....................................................7
Limited Warranty and Remedies. .......................................8
WARNING
!
Read this Manual BEFORE using this equipment.
Failure to read and follow all safety and use information can result in death,
serious personal injury, property damage, or damage to the equipment.
Keep this Manual for future reference.

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077_D 2051 © 2020 tekmar Control Systems Ltd. 077_D 2051 © 2020 tekmar Control Systems Ltd.
Important Safety Information
Understanding Safety Information
This safety-alert symbol is
shown alone or used with
a signal word (DANGER,
WARNING, or CAUTION).
A pictorial and/or safety
message to identify haz-
ards and alert you to the
potential for death or seri-
ous personal injury.
Identifies hazards which, if
not avoided, will result in
death or serious injury.
Identifies hazards which, if
not avoided, could result
in death or serious injury.
Identifies hazards which, if
not avoided, could result
in minor or moderate
injury.
Identifies practices,
actions, or failure to act
which could result in prop-
erty damage or damage
to the equipment.
• Learn how to properly and safely
use the equipment BEFORE install-
ing, setting up, using, or servicing.
• Keep the manual available for easy
access and future reference.
• Replace missing, damaged, or
illegible manual and product labels.
• Read the manual and all product
labels and follow all safety and
other information.
• Replacement manuals available at
tekmar.com
This pictorial alerts you
to the need to read the
manual.
This pictorial alerts you to
electricity, electrocution,
and shock hazards.
WARNING
!
CAUTION
!
NOTICE
DANGER
!
!
WARNING
!
TO AVOID DEATH,
SERIOUS PERSONAL
INJURY, PROPERTY
DAMAGE, OR DAMAGE
TO THE EQUIPMENT:

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077_D 2051 © 2020 tekmar Control Systems Ltd.
Installation – Indoor Sensor 077
Check the Contents
Check the contents of this package. If any of the contents listed are missing or
damaged, please contact your wholesaler or tekmar sales representative for
assistance.
Type 077 includes:
• One Indoor Sensor 077
• One Installation Manual 077_D
• Two 6-32 x 1” screws
Choose a Location
The Indoor Sensor should be installed on an interior wall of the desired zone to be
controlled. Do not mount the 077 in a location that may be affected by localized
heat sources or cold drafts. It may be necessary to install a draft barrier and / or
insulation behind the enclosure in order to prevent air from blowing through the
wiring hole and affecting the Sensor reading.
STEP 1
STEP 2

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077_D 2051 © 2020 tekmar Control Systems Ltd. 077_D 2051 © 2020 tekmar Control Systems Ltd.
Installation – Indoor Sensor 077
Wiring the Indoor Sensor
Run two conductor 18 AWG or similar wire between the Indoor Sensor and the
terminals on the tekmar control. Insert the wires through the hole provided in the
back of the indoor sensor enclosure and connect them to the indoor sensor
terminal block. Do not run the wires parallel to telephone or power lines. If the
indoor sensor wires are located in an area with strong sources of electromagnetic
noise, shielded cable or twisted pair should be used or the wires can be run in a
grounded metal conduit. If using shielded cable, one end of the shield wire should
be connected to the Com-Sen terminals on the control and the other end should
remain free. The shield must not be connected to earth ground. Follow the sensor
testing instructions in this brochure and connect the wires to the control.
Installing the Sensor Front Cover
Place any extra sensor wire into the electrical box. Secure the front cover of the
Indoor Sensor 077 to the electrical box. Ensure the wiring is not pinched or crushed
when installing the front plate.
STEP 3
STEP 4

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077_D 2051 © 2020 tekmar Control Systems Ltd.
Installation – Indoor Sensor 077
Sensor Testing
Instructions
A good quality test meter
capable of measuring up to
5,000 kΩ (1 kΩ = 1000Ω) is
required to measure the sen-
sor resistance. In addition to
this, the actual temperature
must be measured with either
a good quality digital ther-
mometer, or if a thermometer
is not available, a second
sensor can be placed along-
side the one to be tested and
the readings compared.
First measure the tempera-
ture using the thermometer
and then measure the resis-
tance of the sensor at the
control. The wires from the
sensor must not be connect-
ed to the control while the
test is performed. Using the
chart on the following page,
estimate the temperature
measured by the sensor.
The sensor and thermometer
readings should be close. If
the test meter reads a very
high resistance, there may be
a broken wire, a poor wiring
connection or a defective
sensor. If the resistance is
very low, the wiring may be
shorted, there may be mois-
ture in the sensor or the sen-
sor may be defective. To test
for a defective sensor, mea-
sure the resistance directly at
the sensor location.
Do not apply voltage to a
sensor at any time as dam-
age to the sensor may result.

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077_D 2051 © 2020 tekmar Control Systems Ltd. 077_D 2051 © 2020 tekmar Control Systems Ltd.
Technical Data – Indoor Sensor 077
Literature D077D
Packaged weight 0.16 lb. (72 g), baked enamel (white) on steel
Dimensions 41⁄2" H x 27⁄8" W x 1⁄2" D (114 x 73 x 13 mm)
3⁄16" D (5 mm) when installed
Operating range Splash proof, -60 to 140°F (-50 to 60°C)
Sensor NTC thermistor, 10 kΩ @ 77°F (25°C ±0.2°C), ß=3892
Sensor leads 1'(30 cm) 20 AWG, XPE multi strand
Backing 1⁄4" expanded neoprene gasket
Included Two 6-32 x 1" screws

077_D 2051 © 2020 tekmar Control Systems Ltd.
Tel: [phone] • Fax: [phone]
tekmarControls.com
All specifications are subject to change without notice.
Limited Warranty and Product Return Procedure
Limited Warranty The liability of tekmar under this warranty is limited. The Purchaser, by taking
receipt of any tekmar product (“Product”), acknowledges the terms of the Limited Warranty in effect
at the time of such Product sale and acknowledges that it has read and understands same.
The tekmar Limited Warranty to the Purchaser on the Products sold hereunder is a manufacturer’s
pass-through warranty which the Purchaser is authorized to pass through to its customers. Under
the Limited Warranty, each tekmar Product is warranted against defects in workmanship and mate-
rials if the Product is installed and used in compliance with tekmar’s instructions, ordinary wear and
tear excepted. The pass-through warranty period is for a period of twenty-four (24) months from
the production date if the Product is not installed during that period, or twelve (12) months from the
documented date of installation if installed within twenty-four (24) months from the production date.
The liability of tekmar under the Limited Warranty shall be limited to, at tekmar’s sole discretion: the cost
of parts and labor provided by tekmar to repair defects in materials and / or workmanship of the defective
product; or to the exchange of the defective product for a warranty replacement product; or to the granting
of credit limited to the original cost of the defective product, and such repair, exchange or credit shall be
the sole remedy available from tekmar, and, without limiting the foregoing in any way, tekmar is not respon-
sible, in contract, tort or strict product liability, for any other losses, costs, expenses, inconveniences, or
damages, whether direct, indirect, special, secondary, incidental or consequential, arising from ownership
or use of the product, or from defects in workmanship or materials, including any liability for fundamental
breach of contract.
The pass-through Limited Warranty applies only to those defective Products returned to tekmar during the
warranty period. This Limited Warranty does not cover the cost of the parts or labor to remove or transport
the defective Product, or to reinstall the repaired or replacement Product, all such costs and expenses
being subject to Purchaser’s agreement and warranty with its customers.
Any representations or warranties about the Products made by Purchaser to its customers which are differ-
ent from or in excess of the tekmar Limited Warranty are the Purchaser’s sole responsibility and obligation.
Purchaser shall indemnify and hold tekmar harmless from and against any and all claims, liabilities and
damages of any kind or nature which arise out of or are related to any such representations or warranties
by Purchaser to its customers.
The pass-through Limited Warranty does not apply if the returned Product has been damaged by negli-
gence by persons other than tekmar, accident, fire, Act of God, abuse or misuse; or has been damaged by
modifications, alterations or attachments made subsequent to purchase which have not been authorized by
tekmar; or if the Product was not installed in compliance with tekmar’s instructions and / or the local codes
and ordinances; or if due to defective installation of the Product; or if the Product was not used in compli-
ance with tekmar’s instructions.
THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, WHICH THE
GOVERNING LAW ALLOWS PARTIES TO CONTRACTUALLY EXCLUDE, INCLUDING, WITHOUT
LIMITATION, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE, DURABILITY OR DESCRIPTION OF THE PRODUCT, ITS NON-INFRINGEMENT OF ANY
RELEVANT PATENTS OR TRADEMARKS, AND ITS COMPLIANCE WITH OR NON-VIOLATION OF ANY
APPLICABLE ENVIRONMENTAL, HEALTH OR SAFETY LEGISLATION; THE TERM OF ANY OTHER
WARRANTY NOT HEREBY CONTRACTUALLY EXCLUDED IS LIMITED SUCH THAT IT SHALL NOT
EXTEND BEYOND TWENTY-FOUR (24) MONTHS FROM THE PRODUCTION DATE, TO THE EXTENT
THAT SUCH LIMITATION IS ALLOWED BY THE GOVERNING LAW.
Product Warranty Return Procedure All Products that are believed to have defects in workmanship or
materials must be returned, together with a written description of the defect, to the tekmar Representative
assigned to the territory in which such Product is located. If 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.