Honeywell Wheelchair AT120A User Manual

AT120A, AT140A, AT150A, AT175A  
Universal Transformers  
INSTALLATION INSTRUCTIONS  
APPLICATION  
Code Class 2 “not wet” and Class 3 “wet” requirements  
and are Underwriters Laboratories (UL) Inc. listed under  
UL 1585. They can be mounted through a 7/8 in. knock-  
out on the accessory mounting plate (included), or with  
the integral mounting feet. See Table 1 for additional  
specifications.  
These transformers are for use in 24 Vac nominal control  
circuits. They are typically used in heating/cooling control  
systems but can be used in any application that does not  
exceed the load ratings. They meet National Electrical  
Table 1. Model Specifications.  
Primary  
Secondary  
Voltage  
Input  
Voltage  
(60 Hz)  
At Rated  
Power  
Output  
Output Rating at  
100 Percent Power  
Factor  
Model  
Number  
Wiring  
Connections  
Open  
Circuit  
Wiring  
connections  
AT120A  
120/208/  
240  
9 in. leads  
27.0  
24.0  
Screw  
terminals  
20 VA  
AT140A  
120  
9 in. leads  
27.0  
24.0  
Screw  
terminals  
40 VA  
120/208/  
240  
120/240  
208/240  
AT150A  
AT175A  
120/208/  
240  
9 in. leads  
9 in. leads  
27.5  
27.5  
24.0  
24.0  
Screw  
terminals  
50 VA  
75 VA  
120/208/  
240  
Screw  
terminals  
4. After installation is complete, check out product  
INSTALLATION  
operation as provided in these instructions.  
When Installing this Product …  
CAUTION  
Can cause electrical shock or equipment  
damage.  
Disconnect power supply before beginning  
installation.  
1. Read these instructions carefully. Failure to follow  
them could damage the product or cause a hazard-  
ous condition.  
Electrical Hazard.  
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.  
69-0251-3  
 
AT120A, AT140A, AT150A, AT175A UNIVERSAL TRANSFORMERS  
WITH RAISED PORTION OF KNOCKOUTS FACING YOU:  
1. PRY UP TOP SECTION OF LARGE KNOCKOUT  
BY INSERTING SCREWDRIVER FIRST AT ONE  
SIDE OF SLOT AND THEN AT THE OTHER SIDE.  
M12126  
Fig. 3. When screw is tightened, clamp holds  
plate on transformer.  
THEN PRY UP BOTTOM SECTION OF KNOCKOUT.  
2.  
MOUNTING PLATE AT LAMINATIONS  
1. Remove the large rectangular knockout in the  
mounting plate as shown in Fig. 4.  
2. Hold the transformer so the clamp on the end bell  
faces you.  
3. With the keyhole slots up, fit the mounting plate  
over the primary leadwires and end bell. Insert  
small tab at the bottom of the plate into the slot in  
the transformer mounting foot.  
4. Insert the mounting screw (supplied) through the  
holes as shown in Fig. 5. Secure the plate to the  
transformer, but do not overtighten the screw.  
MOUNTING TRANSFORMER AND PLATE ON OUTLET BOX  
The mounting plate can be mounted on 4 in. square  
boxes, 2 x 4 in. rectangular boxes, and on 4 in. octagonal  
boxes. See Fig. 4.  
3. REMOVE BOTH SECTIONS OF KNOCKOUT WITH PLIERS.  
SHADED AREAS REPRESENT KNOCKOUTS  
AND SCREW SLOTS USED WITH 2 X 4 INCH  
OR OCTAGONAL OUTLET BOXES.  
1. Align the plate with the box to determine the correct  
mounting holes. The mounting feet and secondary  
terminals are outside the box.  
2. Remove the mounting hole knockouts, if necessary.  
Mount the plate on the outlet box using two screws  
(obtained locally).  
M9188A  
Fig. 4. Use screwdriver to pry out both  
sections of knockout.  
TRANSFORMER  
PLATE  
Mounting Through Outlet Box Knockout Hole  
The transformer can be mounted on an outlet box using  
the clamp on the primary end bell. The mounting plate is  
not used. To mount the transformer on an outlet box:  
1. Turn the clamp screw almost all the way out.  
2. From outside box, thread the primary leadwires  
through suitable 7/8 in. knockout. Fit the clamp and  
screw through the knockout. Do not mount the  
transformer through a plastic knockout.  
ANT  
T
IMPOR  
MOUNT  
TRANSFORMER  
OTHER SIDE  
3. Tighten the clamp screw securely against the rim of  
the knockout. Avoid damaging the leadwires with  
the screwdriver.  
M9163  
Fig. 5. Mounting screw and tab hold plate on  
transformer.  
3
69-0251-3  
 
AT120A, AT140A, AT150A, AT175A UNIVERSAL TRANSFORMERS  
5. Do not put system into operation unless correct  
Mounting Through Outlet Box Knockout  
primary and secondary voltages are measured.  
The transformer can be mounted on an outlet box using  
the clamp on the primary end bell. The mounting plate is  
not used. To mount the transformer on an outlet box:  
1. Turn the clamp screw almost all the way out.  
2. From outside box, thread the primary leadwires  
through suitable 7/8 in. knockout. Fit the clamp and  
screw through the knockout. Do not mount the  
transformer through a plastic knockout.  
SINGLE VOLTAGE MODELS  
2
COMMON  
BLACK  
VOLTAGE  
PRIMARY  
3
SECONDARY  
1
VARIES  
WITH MODEL  
3. Tighten the clamp screw securely against the rim  
of the knockout. Avoid damaging the leadwires  
with the screwdriver.  
120 V - WHITE  
208 V - RED  
240 V - ORANGE  
277 V - BROWN  
480 V - BLACK/RED  
120/240 MODELS  
WIRING  
2
COMMON  
BLACK  
All wiring must comply with local codes and ordinances.  
Disconnect power before making wiring connections to  
prevent electrical shock or equipment damage.  
1. Make primary connections to the line voltage  
power supply. On multitap models, be sure to use  
correct leads for available power supply. See  
Fig. 6.  
2. On multitap models, insulate the ends of the  
unused leads using wire nuts or capping with a  
solderless connector.  
120 V  
WHITE  
PRIMARY  
3
SECONDARY  
1
240 V  
ORANGE  
208/240 VAC MODELS  
2
COMMON  
208 V  
240 V  
BLACK  
3. Make secondary connections to 24 Vac control  
circuit.  
PRIMARY  
3
SECONDARY  
1
RED  
ORANGE  
CHECKOUT  
120/208/240 VAC MODELS  
2
COMMON  
BLACK  
120 V  
CAUTION  
Overload current protection is inherent on  
AT120, AT140, and AT150. A fused 3.5 Amp  
secondary is used on AT175.  
PRIMARY  
3
SECONDARY  
208 V  
240 V  
WHITE  
RED  
Voltage Check Hazard.  
1
ORANGE  
Do not short transformer secondary terminals.  
1
2
3
SECONDARY CONNECTIONS ARE SCREW TERMINALS, 1/4 INCH  
QUICK-CONNECTS OR BLUE AND YELLOW LEADWIRES.  
BLACK IS COMMON WITH RESPECT TO THE TRANSFORMER  
WINDING ONLY AND NOT THE EXTERNAL CIRCUIT.  
Voltage Check  
After installation is complete, turn on power supply and  
perform a voltage check:  
SOME MODELS AVAILABLE WITH 1/4 INCH QUICK CONNECTS.  
M22974  
1. Place controlled equipment in operation and  
observe through one complete cycle.  
2. Using a voltmeter, check for proper primary and  
secondary voltages.  
Fig. 6. Schematics for single and multitap  
transformers.  
3. If voltage readings are incorrect, be sure primary  
voltage connections are made correctly.  
4. Measure voltage again:  
a. If correct primary voltage is measured and  
secondary voltage is significantly less than the  
voltage shown on the regulation curves,  
transformer winding is damaged. Replace  
transformer and repeat checkout procedures.  
b. If primary voltage is 0V, be sure power supply  
is connected correctly or repair, if necessary.  
Repeat checkout procedures.  
Automation and Control Solutions  
Honeywell International Inc.  
1985 Douglas Drive North  
Golden Valley, MN 55422  
customer.honeywell.com  
Honeywell Limited-Honeywell Limitée  
35 Dynamic Drive  
Scarborough, Ontario M1V 4Z9  
® U.S. Registered Trademark  
© 2005 Honeywell International Inc.  
69-0251-3 G.H. Rev. 06-05  
 

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