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MISCELLANEOUS
E2010 Lennox Industries Inc.
Dallas, Texas, USA
KITS AND ACCESSORIES
504,763M
10/10
Supersedes 04/03
BC OUTDOOR
TEMPERATURE SENSOR
Litho U.S.A.
INSTALLATION INSTRUCTIONS FOR THE BC OUTDOOR TEMPERATURE SENSOR (59M05)
USED WITH BUILDING CONTROLLERS ON THE L CONNECTION NETWORK
Shipping and Packing List
Package 1 of 1 contains:
The temperature will be displayed on the NCP. Refer
to the NCP Software manual to enter a description of
the temperature input.
1 − Sensor (A2) assembly
1 − Weathertight fitting
4 − Screws
KNOCK−OUT
IN HOUSING
KNOCK−OUT
IN UNIT
WARNING
Personal injury, loss of life, or damage to property!
Installation and service must be performed by a
qualified installer or service agency.
Improper installation, adjustment, alteration, service or maintenance can cause personal injury, loss
of life, or damage to property.
Application
SENSOR COVER
(ORIENT DOWN-
WARD)
Figure 1. Install Sensor Assembly
This sensor provides outdoor temperature data to the
Building Controller, which, based on over− or under−temperature conditions, may use the data to override NCP
scheduled outputs and to set alarms.
BC Temperature
Sensors
The BC Building Controller, when used with the L Connection Network, controls lights, vent hoods, exhaust fans,
sprinklers, security and fire systems, and other building
equipment.
Location
Install sensor on unit side panel near low voltage entry or
other outdoor location.
Installation
1. Route one twisted pair shielded cable from rooftop unit
to Building Controller.
CABLE TYPE: Lennox P/N 94L63, Belden type
88761 or equivalent (22AWG stranded or twisted pair,
100% aluminum shield with drain wire, Teflon jacket).
2. Remove knock−out in back of sensor housing. Drill a
hole in unit panel the same size as the knock−out on
the back of the sensor housing.
3. Align knock−outs and install sensor using weathertight
fitting as shown in figure 1 or screws provided in kit.
NOTE − Make sure screws clear any components on
the inside of the unit.
4. Connect sensor to any available input (T1, T2, T3, T4)
on P187 Building Controller terminal block. Connect
the shield drain wire to the input common as shown in
figure 2. Note which inputs are used and refer to Unit
Controller (UC) Software manual to configure override
outputs and alarms.
10/10 504,763M
Figure 2. Wire Outdoor Sensor to P187 on BC1
Sensor Check
Check the temperature displayed on the NCP. If the temperature is incorrect, disconnect the sensor from the BC
and measure the resistance. The resistance should correspond to the temperature as follows:
IMPORTANT: The sensor must be disconnected from the
BC before measuring resistance.
°F Resistance °F
−40 335,671 40 26,106 90 7,332
−20 164,959 50 19,904 100 5,826
0 85,323 60 15,313 120 3,756
20 46,218 70 11,884 130 3,047
30 34,566 80 9,298
All values are +/− 2%.
The operating range of each input is −40°F to 130°F (−40°C to 54°C).
*2P1010* *P504763M*
OPTIONAL
WEATHER-
TIGHT FIT-
TING
Resistance
P187
1
1
T1
2
Building
3
Controller
T2
4
5
T3
6
7
T4
8
Resistance
°F
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