Instructions / Assembly

AT20, AT40, AT72D, AT87, AT88 AT TRANSFORMERS
© 2020 Resideo Technologies, Inc. All rights reserved.
This product is manufactured by Resideo Technologies, Inc. and its affiliates.
www.resideo.com
Resideo Technologies, Inc.
1985 Douglas Drive North, Golden Valley, MN 55422
1-800-468-1502
69-1641EF—02 M.S. Rev. 08-20 | Printed in United States
Fig. 13. AT88 Transformer schematic.
CHECKOUT
After installation is complete, turn on power supply.
Placed controlled equipment into operation and observe
through at least one complete cycle. Make sure it
functions as intended.
SECONDARY CONNECTIONS ARE BLUE AND YELLOW
LEADWIRES.
BLACK IS COMMON WITH RESPECT TO THE TRANSFORMER
WINDING ONLY AND NOT THE EXTERNAL CIRCUIT.
ORANGE
RED
1
2
M20661
COMMON
1 24 VAC
2
BLACK
208 VAC
240 VAC