Honeywell Weather Radio C7046A User Manual

C7046A,B,C,D  
Air Temperature Sensors  
INSTALLATION INSTRUCTIONS  
APPLICATION  
2 (51)  
8 (203)  
1 (25)  
1
1/16 (2)  
The C7046 series of Air Temperature Sensors function  
as primary and/or secondary sensors in electronic control  
systems.  
PLASTIC  
BUSHING  
3/4 (19)  
1
(25)  
LOCKING PUSH  
NUTS (2)  
1/4 (6)  
DIAMETER (2 HOLES)  
NEOPRENE  
GASKET  
INSTALLATION  
5/16 (9) DIAMETER  
(BUSHING)  
M22402A  
1
INSERTION LENGTH DEPENDS UPON THE MODEL.  
When Installing this Product...  
1. Read these instructions carefully. Failure to follow  
them could damage the product or cause a hazard-  
ous condition.  
Fig. 1. C7046A,B,C,D Air Temperature  
Sensor dimensions in in. (mm).  
2. Check the ratings given in the instructions and on  
the product to make sure the product is suitable for  
your application.  
3. Installer must be a trained, experienced service  
technician.  
4. After installation is complete, check out product  
operation as provided in these instructions.  
NOTE: Sensor probe diameter is 1/4 in. (6 mm).  
Location  
The sensor should be located in the air duct or plenum  
where it will sample an average air temperature. Avoid  
locations where air stratification can cause sensing  
errors.  
CAUTION  
Mounting  
Electrical Shock or Equipment Damage  
Hazard.  
Mounting on Flat Duct or Plenum Surface (Fig. 2)  
1. Cut a 3/8 in. (9.5 mm) hole in the duct or plenum  
surface at the desired location.  
Can shock individuals or short equipment  
circuitry.  
Disconnect power supply before installation.  
2. Insert sensor probe into the duct or plenum until  
the flange rests against the duct or plenum wall.  
3. If necessary, use the flange as a template to mark  
and drill two holes for No. 8 mounting screws.  
4. Fasten the sensor to the duct or plenum surface  
with two No. 8 sheet metal screws (not provided).  
The sensor assembly (see Fig. 1) consists of an  
aluminum sensor probe (element housed internally) with  
attached flange that can be mounted on a flat duct or  
plenum surface, or in a 2 in. by 4 in. (51 by 102 mm)  
junction box using two No. 8 screws. Connections to the  
sensor are made through two 6 in. (152 mm) leadwires.  
Mounting in a Junction Box (Fig. 3)  
1. Cut a 3/8 in. (9.5 mm) hole in the duct or plenum  
surface at the desired location.  
2. Remove the center rear knockout from the junction  
box and insert the sensing probe through the  
knockout with the flange flat against the outlet box.  
3. Using the flange as a template, mark and drill two  
holes in the junction box and the duct or plenum  
surface for No. 8 mounting screws.  
4. Insert sensor probe through both the junction box  
knockout and the 3/8 in. (9.5 mm) hole drilled in the  
duct or plenum and fasten the junction box and  
sensor to the duct or plenum surface.  
® U.S. Registered Trademark  
Copyright © 2004 Honeywell International Inc. • All Rights Reserved  
62-0216  
 
C7046A,B,C,D AIR TEMPERATURE SENSORS  
OPERATION AND CHECKOUT  
W7081  
LIMIT CONTROLLER  
Operation  
The C7046A,B,C Air Temperature Sensors consist of a  
thermistor sensing element mounted in a tubular probe.  
They are applied at various locations throughout single  
zone and multizone duct systems. The negative  
temperature coefficient (NTC) characteristic of the  
thermistor element causes its resistance to decrease as  
the sampled air temperature increases. This resistance  
shift is balanced with other system sensor signals by  
appropriate system logic panels to stabilize system  
control.  
ECONOMIZER/MIXED AIR LOW LIMIT–A5  
1
2
3
4
5
6
C7046B  
(OR C7100B)  
MIXED AIR  
SENSOR  
50  
60 NO JUMPER  
55  
COLD DECK LOW LIMIT–A6  
1
2
3
4
5
6
C7046B  
(OR C7100B)  
COLD DECK  
SENSOR  
45  
55 NO JUMPER  
55  
HOT DECK HIGH LIMIT–A7  
1
2
3
4
5
6
C7046B  
(OR C7100B)  
HOT DECK  
SENSOR  
The C7046D Air Temperature Sensor consists of a  
platinum thin film sensor element mounted in a tubular  
probe. It can be applied at various locations throughout  
single zone and multizone duct systems. The positive  
temperature coefficient (PTC) characteristics of the  
platinum thin film element causes its resistance to  
increase as the sampled air temperature increases. This  
resistance shift is balanced with other system sensor  
signals by the Excel 500 Control System.  
90  
110  
130 NO JUMPER  
24 Vdc  
7
8
+
+24 VDC  
C7046B  
C7046B  
(OR C7100B)  
REMOTE  
RETURN  
AIR SENSOR  
(IF USED)  
T7080A,B  
Checkout  
(OR C7100B)  
ZONE (N)  
DISCHARGE  
SENSOR  
Allow the C7046 Air Temperature Sensor to soak in the  
air moving through the duct or plenum for a minimum of  
five minutes before taking a resistance measurement.  
1. Disconnect the sensor leadwires from the associ-  
ated system components.  
7
6
1
2
1
2
C7100B AVERAGING  
TEMPERATURE SENSOR  
MAY BE SUBSTITUTED IF  
SPACE PERMITS.  
5
4
3
8
2
2. Connect an ohmmeter across the leadwires.  
3. Assure nominal resistance measurements are in  
accordance with the resistance/temperature curves  
shown in Figs. 7, 8 and 9.  
4. Reconnect sensor leadwires to associated system  
components.  
REMOTE RETURN AIR  
SENSOR USED WITH T7080B ONLY.  
M17966A  
Fig. 5. Connecting C7046B Air Temperature Sensor  
for mixed air, cold deck and hot deck sensing, zone  
discharge and optional remote return air sensing  
in W7080 Multizone System.  
5. Check operation of the complete control system.  
17000  
16000  
15000  
14000  
13000  
12000  
11000  
10000  
9000  
C7046D  
XF521A/XF526  
1
2
1
2
1
2
AI 1  
AI 2  
AI 3  
3
4
5
6
7
8
8000  
AI 4  
AI 5  
AI 6  
AI 7  
AI 8  
9
7000  
10  
11  
12  
13  
14  
15  
16  
17  
18  
6000  
5000  
4000  
3000  
2000  
1000  
3,000 OHMS  
AT 77 F (25 C)  
10  
-10  
20  
30  
40  
50  
10  
60  
15  
70  
20  
80  
25  
90  
30  
100  
35  
F
-5  
0
5
C
TEMPERATURE (DEGREES)  
M17969  
M2825  
Fig. 7. C7046A,C Sensor resistance vs. temperature.  
Fig. 6. Connecting C7046D Air Temperature  
Sensor to Excel 500 Control System.  
3
62-0216  
 
C7046A,B,C,D AIR TEMPERATURE SENSORS  
120000  
100000  
RESISTANCE  
(OHMS)  
1159  
22,800 OHMS AT  
77 F (25 C)  
80000  
60000  
40000  
1141  
20000  
0
1126  
1111  
1096  
1081  
1066  
1051  
F
20  
30 40 50 60 70 80 90 100 110 120 130 140  
C
-7  
0
5
10 15 20 25 30 35 40 45 50 55 60  
M17973  
TEMPERATURE (DEGREES)  
1097 OHMS AT  
77 F [25 C]  
Fig. 8. C7046B Sensor resistance vs. temperature.  
55  
13  
60  
65  
70  
75  
80  
85  
90  
95  
35  
100 105 F  
15  
20  
25  
30  
38  
41 C  
M2826  
TEMPERATURE (DEGREES)  
Fig. 9. C7046D Sensor resistance vs. temperature.  
Automation and Control Solutions  
Honeywell International Inc.  
1985 Douglas Drive North  
Golden Valley, MN 55422  
Honeywell Limited-Honeywell Limitée  
35 Dynamic Drive  
Scarborough, Ontario  
M1V 4Z9  
62-0216 B.B. 11-04  
 

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