Wall Plate Temperature Sensors with
Pushbutton Override (O, O1 & O2 Series)
Installation & Operating Instructions
8587_ins_sp_ap_o_01_02 rev. 08/01/18
Product Identication
Figure 1:
Wall Plate with Standard
Pushbutton Override (O)
Mounting
Ensure the plate does not touch the wall when it is mounted as this will lead to slower response
rates when the environment changes.
Mounting hardware is provided for both junction
box and drywall installation.
Junction Box
1. Pull the wire through the wall and out of the
junction box, leaving about 6” free.
2. Terminate the unit according to the
guidelines in Termination on page 1.
3. Secure the plate to the box using the
#6-32 x 1/2” mounting screws provided
or with security screws which are
sold separately. (Call BAPI or visit the
Accessories section of our website for
security screw ordering.)
4. Tighten screws until the foam gasket
on the back plate is compressed about
50%. Ensure the plate doesn’t touch the
wall (Fig 5).
Note: Louvered wall plates require a mounting adapter bracket for J-Box mounting. The bracket is not shown in the
diagram above but is included with any louvered wall plates ordered from BAPI.
Wall Plate with Durable Style
Pushbutton Override (O1)
Figure 2:
Prole Style Pushbutton
Verify visible
air gap
between plate
and wall.
Mounted Plate
Figure 3:
Wall Plate with Low
Override (O2)
Fig 5:
Side View of
Prole Style Pushbutton
Override (O2G or O2R)
Figure 4:
Wall Plate with Low
Fig 6:
J-Box Mounting
Drywall Mounting
1. Place the plate against the wall where you want to mount the sensor and mark out the two mounting holes.
2. Drill two 3/16” holes in the center of each marked mounting hole. Insert a drywall anchor into each hole.
3. Cut hole between the mounting holes that clears the apparatus mounted on plate. Pull the wire through the wall hole
cut in step 2, leaving about 6” free.
4. Terminate the unit according to the guidelines in Termination on page 1.
5. Secure the plate to the drywall anchors using the #6 x 1” mounting screws provided. Tighten screws until the foam
gasket on the back plate is compressed about 50%. Ensure the plate doesn’t touch the wall.
Note: In any wall-mount application, the wall temperature and the temperature of the air within the wall cavity can cause
erroneous readings. The mixing of room air and air from within the wall cavity can lead to condensation, erroneous
readings and premature failure of the sensor. To prevent these conditions, seal the conduit leading to the junction box or
ll the box with insulation.
Specications subject to change without notice.
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Wall Plate Temperature Sensors with
1.8KΩ Orange/Red 10K-3Ω Yellow/Red 100Ω Red/Red 1KΩ Green/Green
2.2KΩ Brown/White 10K-3(11K)Ω Yellow/Blue 1KΩ Orange/Orange
3KΩ Yellow/Black 20KΩ White/White 2KΩ Brown/Blue
3.25KΩ Brown/Green 47KΩ Yellow/Orange 100Ω Red/Red/Black
3.3KΩ Yellow/Brown 50KΩ White/Blue 1KΩ Orange/Orange/Black LM334 Red/Black
10K-2Ω Yellow/Yellow 100KΩ Yellow/White AD592 Red/Black
AD592-10K Red/Black/White
Nickel RTD
Silicon RTD
Semiconductors
Thermistors
Table 1: Temperature Sensor Lead Wire Colors
Thermistors
Platinum RTDs - 2 Wire
Platinum RTDs - 3 Wire
Pushbutton Override (O, O1 & O2 Series)
Installation & Operating Instructions
8587_ins_sp_ap_o_01_02 rev. 08/01/18
J-Loop Termination Technique
Incorporating a “J-Loop” (also known as a drip loop) into all terminations adds an additional layer of protection against
moisture and oxidation by directing moisture away from the connection. The idea is to place the wire junction as high as
possible and form a “J” with the leadwires. The bottom of this “J” should be below the junction point. Any moisture that collects on the leadwires is pulled downward by gravity to the bottom of this loop and away from the junction.
Fig. 7: J-Loop Technique
Fig. 8: J-Loop with Crimp-On Seal-
ant Filled Connector (BA/SFC1000)
Fig. 9: J-Loop with Twist-On Seal-
ant Filled Connector (BA/SFC2000)
Termination
BAPI recommends using twisted pair of at least 22AWG and sealant lled connectors for all wire connections. Larger gauge
wire may be required for long runs. All wiring must comply with the National Electric Code (NEC) and local codes.
Do NOT run this device’s wiring in the same conduit as AC power wiring. BAPI’s tests show that uctuating and inaccurate
signal levels are possible when AC power wiring is present in the same conduit as the signal lines.
BAPI recommends wiring the product with power disconnected. Proper supply voltage, polarity, and
wiring connections are important to a successful installation. Not observing these recommendations may
damage the product and will void the warranty.
Sensor Termination:
Terminate the sensor wires to your controller wires using BAPI sealant lled connectors. The wallplate’s foam back insulates the temperature sensor from the wall temperature and/or conduit drafts.
Specications subject to change without notice.
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Wall Plate Temperature Sensors with
Standard Override (O) 1 amp
Durable Override (O1) 250 milli-amps
Low Profile (O2) 125 milli-amps
Table 2 - Switch Contact Ratings
Pushbutton Override (O, O1 & O2 Series)
Installation & Operating Instructions
8587_ins_sp_ap_o_01_02 rev. 08/01/18
Termination continued...
The Wall Plate Pushbutton Override is
a dry contact, normally-open switch.
The contacts close for as long as you
hold the switch down. All switches are
for NEC Class 2 circuits only.
Sensor
Wires
Center Terminal
Not Used
Standard and Durable Override:
The Standard Override (O) and
Durable Override (O1) have two white
wires attached to either side of the
override switch.
Low Prole Override:
The Low Prole Override (O2)
has three screw terminals that
accommodate 16 to 28 gauge wire.
The center terminal is not used.
Low Prole Override with LED:
The Low Prole Override with LED
(O2G or O2R) has four screw terminals
that accommodate 16 to 28 gauge wire.
The terminals marked OVR are the dry
contact output of the override switch,
and the + and - terminals are power for
the LED.
Override
Switch
Wires
Fig. 10: Wiring for the Standard (O) and
Durable Pushbutton (O1) Override
Figure 11: Screw Terminals
for the Low Prole Pushbutton
(O2) Override. The center
terminal is not used.
Fig. 12: Wiring Examples for a Wall Plate with Low Prole Style Pushbutton
Override with 5 VDC and 24 VAC/VDC LED (O2G5 & O2G24 or O2R5 & O2R24)
Specications
Sensor: Passive
Thermistor: Thermal resistor (NTC)
Temp. Output: Resistance
Accuracy(std): ±0.36°F, (±0.2°C)
Accuracy (High) ±0.18°F, (±0.1°C), [XP] option
Stability: < 0.036°F/Year, (<0.02°C/Year)
Heat dissipation 2.7 mW/°C
Temp. Drift <0.02°C per year
Probe range: -40° to 221º°F (-40° to 105°C)
RTD: Resistance Temperature Device (PTC)
Platinum (Pt) 100Ω and 1KΩ @0ºC, 385 curve,
Platinum (Pt) 1KΩ @0°C, 375 curve
Pt Accuracy (std) 0.12% @Ref, or ±0.55°F, (±0.3°C)
Pt Stability ±0.25°F, (±0.14°C)
Pt Self Heating 0.4 °C/mW @0°C
Pt Probe Range -40° to 221°F, (-40 to 105°C)
Nickel (Ni) 1000Ω @70°F, JCI curve
Ni Probe Range -40° to 221°F (-40 to 105°C)
Specications subject to change without notice.
Sensitivity: Approximate @ 32°F (0°C)
Thermistor: Non-linier (See bapihvac.com for specs)
RTD (Pt) 3.85Ω/°C for 1KΩ RTD
0.385Ω/°C for 100Ω RTD
Nickel (Ni): 2.95Ω/°F for the JCI RTD
Lead Wire: 22AWG Stranded
Insulation: Etched Teon, Plenum rated
Enclosure: Stainless Steel Plate
Foamback: 0.25” Closed Cell Foam
Mounting: 2x4” J-box or Direct Wall
Ambient (Encl.): 0 to 100% RH, Non-condensing
-40°F to 185°F, (-40° to 85°C)
Agency: RoHS, CE, PT = DIN43760,
Options: Override Switch
O N.O. switch, 115 VAC, 1 amp max
O1 N.O. switch, 28 VDC, 250mA amp max
O2 N.O. switch, 4 to 48 VDC, 150mA max
O2G & O2R O2 Switch w/ green or red LED,
IEC Pub 751-1983, JIS C1604-1989
5V (11mA) or 24V (15mA) power
3 of 4
Wall Plate Temperature Sensors with
Pushbutton Override (O, O1 & O2 Series)
Installation & Operating Instructions
8587_ins_sp_ap_o_01_02 rev. 08/01/18
Diagnostics
Possible Problems:
General troubleshooting
Temperature reading is incorrect
Possible Solutions:
- Determine that the input is set up correctly in the controller’s and building
automation software.
- Check wiring for proper termination or corrosion.
- Check for corrosion at either the controller or the sensor. Clean off the
corrosion, re-strip the interconnecting wire and reapply the connection. In
extreme cases, replace the controller, interconnecting wire and/or sensor.
- Label the terminals that the interconnecting wires are connected to at
the sensor end and the controller end. Disconnect the interconnecting
wires from the controller and the sensor. With the interconnecting wires
separated at both ends measure the resistance from wire-to-wire with a
multimeter. The meter should read greater than 10 Meg-ohms, open or OL
depending on the meter you have. Short the interconnecting wires together
at one end. Go to the other end and measure the resistance from wireto-wire with a multimeter. The meter should read less than 10 ohms (22
gauge or larger, 250 feet or less). If either test fails, replace the wire.
- Determine that the temperature sensors wires are connected to the correct
controller input terminals and are not loose.
- Check the wires at the sensor for proper connections.
- Measure the physical temperature at the temperature sensor’s location
using an accurate temperature standard. Disconnect the temperature
sensor wires and measure the temperature sensor’s resistance across the
sensor output pins with an ohmmeter. Compare the temperature sensor’s
resistance to the appropriate temperature sensor table on the BAPI web
site. If the measured resistance is different from the temperature table
by more than 5% call BAPI technical support. Find BAPI’s website at
www.bapihvac.com; click on “Resource Library” and “Sensor Specs”, then
click on the type of sensor you have. Don’t forget to reconnect the wires.
- Make sure that the sensor leads are not touching
Override is not working correctly
- Check that the resistance across the override output is less than 5 ohms
when the override switch is pushed
Compare the readings to the appropriate temperature table on the BAPI website:
http://www.bapihvac.com
Click on “Resource Library” and “Sensor Specs”, then on the sensor table needed.
Related Products
BA/SFC1000-100 Sealant lled crimp connectors (100 connectors)
BA/SFC2000-100 Sealant lled crimp twist on wire nuts (100 nuts)
Specications subject to change without notice.
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