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APPLICATION
The AT20, AT40, AT72, AT87 and AT88 TRADELINE®
Transformers are step-down transformers used primarily
for powering 24 Vac control systems. They can be used
in any 24 Vac application that does not exceed the
transformer volt-ampere (VA) rating.
The TRADELINE® Transformers will replace all
equivalent Honeywell and competitive transformers with
similar primary voltage requirements, equal or smaller VA
ratings and similar mounting configurations.
Voltage and
Model
Frequency
120 Vac, 50/60 Hz
a
AT20
120 Vac, 50/60 Hz
a
AT40
240 Vac, 50/60 Hz
120 Vac, 50/60 Hz
a
AT72D
240 Vac, 50/60 Hz
a
120 Vac, 50/60 Hz
AT87A
208 Vac, 50/60 Hz
240 Vac, 50/60 Hz
AT88A
120Vac, 50/60 Hz
208/240 Vac, 50/60
Hz
400 Vac, 50/60 Hz
480 Vac, 50/60 Hz
a
Transformer complies with 24 volt NEMA Standard DC-20.
b
Available with female quick-connect terminals on all leadwires.
c
Thermal fuses in primary on 208V/240V models for overload protection.
® U.S. Registered Trademark
Copyright © 2002 Honeywell • All Rights Reserved
AT20, AT40, AT72D, AT87, AT88
Table 1. Transformer Model and Electrical Specifications.
Primary
Wiring Connection
Two 9 in. (229 mm)
leadwires
Three 9 in. (229
mm) leadwires
Two 13 in. (330 mm)
leadwires
Two 12 in. (305 mm)
leadwires
b
AT Transformers
Transformer voltage ratings (primary and secondary),
wiring connection type, and fusing are listed in Table 1.
The transformers are Underwriters Laboratories Inc.
component recognized and Canadian Standards
Association listed and meet NEC Class 2 not wet, Class
3 wet requirements as specified by NEMA Standard
DC-20.
SPECIFICATIONS
Models:
See Table 1.
Secondary
Voltage
Wiring Connection
24 Vac
Two 9 in. (229 mm)
leadwires
Two screw
terminals
24 Vac
Two 12 in. (305
mm) leadwires
INSTALLATION INSTRUCTIONS
Output at
100 Percent
Power
Rating
20 VA
40 VA
50 VA
75 VA
Overload
Protection
Energy
c
Limited
Fuse in
secondary
69-1641EF
Related Manuals for Honeywell AT Series
Summary of Contents for Honeywell AT Series
- Page 1 480 Vac, 50/60 Hz Transformer complies with 24 volt NEMA Standard DC-20. Available with female quick-connect terminals on all leadwires. Thermal fuses in primary on 208V/240V models for overload protection. ® U.S. Registered Trademark 69-1641EF Copyright © 2002 Honeywell • All Rights Reserved...
-
Page 2: Installation
AT20, AT40, AT72D, AT87, AT88 AT TRANSFORMERS INSTALLATION USE SCREWS OR BOLTS THROUGH SLOTS (4) IN MOUNTING FEET AT40C 2- 1-3/4 44 2-3/16 56 2-7/8 73 13/32 AT87A 2- 1-3/4 44 2-1/16 52 13/32 When Installing This Product… 1. Read these instructions carefully. Failure to follow them could damage the product or cause a MOUNTING FOOT (2) M20655... - Page 3 AT20, AT40, AT72D, AT87, AT88 AT TRANSFORMERS Mounting the AT72D Transformer. Mounting Transformer and Plate to Electrical Mount the transformer to meet the application. Use one of the methods illustrated. The transformer can be The mounting plate can be mounted to 4 in. x 4 in. boxes mounted in any position.
- Page 4 AT20, AT40, AT72D, AT87, AT88 AT TRANSFORMERS M12126 Fig. 5. Tighten clamp securely against rim of round hole. WITH RAISED PORTION OF KNOCKOUTS FACING YOU: PRY UP TOP SECTION OF LARGE KNOCKOUT BY INSERTING SCREWDRIVER FIRST AT ONE THEN PRY UP BOTTOM SECTION OF KNOCKOUT. SIDE OF SLOT AND THEN AT THE OTHER SIDE.
- Page 5 AT20, AT40, AT72D, AT87, AT88 AT TRANSFORMERS TRANSFORMER USE SCREWS OR BOLTS THROUGH PLATE SLOTS (4) IN MOUNTING FEET LEADWIRES FOR PRIMARY CONNECTIONS SCREW TERMINALS SECONDARY CONNECTIONS M20659 Fig. 9. Foot mounting of AT87 Transformer. M9163 Plate Mounting Fig. 7. Secure plate to transformer with mounting The mounting plate allows the transformer to be mounted screw.
- Page 6 BLACK IS COMMON WITH RESPECT TO THE TRANSFORMER WINDING AND NOT THE EXTERNAL CIRCUIT. M18321 Fig. 11. AT72D, AT87A Transformer schematic. Automation and Control Solutions Honeywell Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9 69-1641EF G.R.
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Page 7: Notice D'installation
120 V c.a., Deux conducteurs de 50 VA AT87A 50/60 Hz 330 mm (13 po) 208 V c.a., 50/60 Hz 240 V c.a., 50/60 Hz ® Marque de commerce enregistrée aux États-Unis Copyright © 2002 Honeywell • Tous droits réservés 69-1641EF... - Page 8 TRANSFORMATEURS AT AT20, AT40, AT72D, AT87, AT88 Tableau 1. Modèles de transformateurs et caractéristiques électriques. (suite) Primaire Secondaire Puissance de sortie - facteur Protection Tension et de puissance contre les Modèle fréquence Raccordement Tension Raccordement de 100% surcharges AT88A 120 V c.a., Deux conducteurs de 24 V c.a.
- Page 9 TRANSFORMATEURS AT AT20, AT40, AT72D, AT87, AT88 1. Enlever la grande ouverture défonçable au centre de la plaque de montage (Fig. 6). MONTAGE HORIZONTAL 2. Tenir le transformateur dans une main et la plaque SUR SOCLE de montage dans l'autre, les fentes en trou de serrure de la plaque vers le haut.
- Page 10 TRANSFORMATEURS AT AT20, AT40, AT72D, AT87, AT88 PLAQUE MONTÉE AU NIVEAU DE L'ÉTRIER DU FLASQUE (LE TRANSFORMATEUR ENTIÈREMENT PAR-DESSUS LA PLAQUE DE MONTAGE) PLAQUE DE MONTAGE FLASQUE VIS DE L'ÉTRIER BORNES ET ÉTRIER À VIS CONNEXIONS SECONDAIRES CONDUCTEURS M12126 DE CONNEXIONS PRIMAIRES PARTIE SURÉLEVÉE DE LA GRANDE Fig.
- Page 11 TRANSFORMATEURS AT AT20, AT40, AT72D, AT87, AT88 TRANSFORMATEUR INSÉRER DES VIS OU DES BOULONS PLAQUE DANS LES FENTES (4) DU SOCLE DE MONTAGE. CONDUCTEURS DES CONNEXIONS PRIMAIRES BORNES Á VIS DES CONNEXIONS SECONDAIRES MF20659A Fig. 9. Montage sur socle du transformateur AT87. MF9163 Montage sur plaque La plaque de montage permet de monter le...
- Page 12 TRANSFORMATEUR SEULEMENT, NON PAS POUR LE CIRCUIT EXTERNE. MF18321 Fig. 11. Schéma du transformateur AT72D, AT87A Solutions de régulation et d'automatisation Honeywell Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35, Dynamic Drive Golden Valley, MN 55422 Scarborough (Ontario) M1V 4Z9 69-1641EF G.R.