Advertisement
AT150F, AT175F UNVIVERSAL CIRCUIT BREAKER TRANSFORMERS
Conduit/Panel Mounting
Mount the transformer on a plate or panel (not included)
with a 7/8 in. knockout. The transformer has a 1/2-14
NPSM conduit connector and lock nut.
1. With the conduit connector side of the transformer
facing the plate, thread the leadwires through the
plate knockout.
2. Insert the connector in the knockout.
3. While holding the plate in place, assemble and
tighten the lock nut to fasten the transformer
securely. See Fig. 2. Avoid damaging the leadwires
with the screwdriver.
4. Make line voltage primary connections within an
approved enclosure.
MOUNTING
PLATE (NOT
INCLUDED)
LEADWIRES
FOR PRIMARY
AND SECONDARY
CONNECTIONS
CONDUIT
CONNECTOR
LOCK NUT
Fig. 2. Conduit/panel mounting (plate not included).
Wiring
1. All wiring must comply with local codes and ordi-
nances. Disconnect power before making wiring
connections to prevent electrical shock or equipment
damage.
2. Make the primary connections to the line voltage
power supply. Be sure to use the correct leadwires
for the available power supply. See Fig. 3.
3. Insulate the ends of the unused leadwires using wire
nuts or capping with a solderless connector.
4. Make the secondary connections to the 24 Vac
control circuit.
Home and Building Control
Honeywell Inc.
Honeywell Plaza
P.O. Box 524
Minneapolis, MN 55408-0524
69-1014—1 C.H. Rev. 9-96 Printed in China
69-1014
RESET
BUTTON
END
BELL
Home and Building Control
Honeywell Limited-Honeywell Limitée
155 Gordon Baker Road
North York, Ontario
M2H 2C9
PRIMARY
PRIMARY
1
SECONDARY LEADWIRES ARE BLUE AND YELLOW LEADWIRES.
BLACK IS COMMON WITH RESPECT TO THE TRANSFORMER
2
WINDING ONLY AND NOT THE EXTERNAL CIRCUIT.
CHECKOUT
Voltage Check
After the installation is complete, turn on the power supply
and perform a voltage check.
1. Place the controlled equipment in operation and
observe through one complete cycle.
2. Using a voltmeter, verify the proper primary and
secondary voltages.
3. If the voltage readings are incorrect, make sure the
primary voltage connections are made properly.
M6906
4. Measure the voltage again.
a.
b.
5. Do not put the system into operation unless the
correct primary and secondary voltages are
measured.
Circuit Breaker
Overloading the transformer results in tripping the circuit
breaker. If the secondary side of the transformer is short
circuited, the circuit breaker trips in less than one minute.
Reset the circuit breaker by pressing the reset button on
the side of the transformer. It can take up to one hour for
the transformer to cool, allowing it to reset. If the circuit
breaker continues to trip, thoroughly check the system for
short circuits and the current draw.
2
120/208/240 VAC MODELS
2
COMMON
BLACK
120V
WHITE
208V
RED
240V
ORANGE
208/277/480 VAC MODELS
2
COMMON
BLACK
208V
RED
277V
BROWN
480V
BLACK/RED
Fig. 3. Transformer schematics.
If the proper primary voltage is measured and
the secondary voltage is significantly less than
the voltage shown in Table 1, the transformer
winding is damaged. Replace the transformer
and repeat the checkout procedures.
If the primary voltage is 0V, make sure the
power supply is connected properly or repair if
necessary. Repeat the checkout procedures.
Helping You Control Your World®
SECONDARY
1
SECONDARY
1
M6907
Advertisement
