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Honeywell ST9103A Installation Instructions Manual

Electronic fan timer
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APPLICATION
The ST9103A Electronic Fan Timer integrates control of all
burner and circulator fan operations in an oil furnace. This
control is the central wiring point for most of the electrical
components in the furnace. The basic purposes of the
ST9103A are to monitor the thermostat for heat, cool, and fan
demands and run the oil burner primary control and up to a
two-speed circulating fan as required. The ST9103A also
monitors a limit switch string, which energizes the circulating
fan whenever the limit switch opens.
Electronic air cleaner and humidifier convenience terminal
connections may be provided as an option. A means for
operating continuous indoor air circulation is also available as
an option.

SPECIFICATIONS

Electrical Ratings:
Power Requirements:
Voltage: 18-30 Vac, 50/60 Hz.
Current: 4 VA at 24 Vac.
Contact Ratings:
Circulating Fan: 15A Full Load, 30A Locked Rotor at
115 Vac (includes optional EAC load).
On/Off Delay Settings:
Delay On: 30 seconds, fixed.
Delay Off: 60, 90, 120, 150 seconds, field-adjustable.
Timing Tolerance: larger of ±20% or 5 seconds.
Envrionmental Ratings:
Temperature: -40 to +150° F [-40° to +66° C].
Humidity: 95% maximun, noncondensing.
INSTALLATION
When Installing this Product...
1. Read these instructions carefully. Failure to follow them
could damage the product or cause a hazardous
condition.
Copyright © 1997 Honeywell Inc. • All Rights Reserved
Electronic Fan Timer
INSTALLATION INSTRUCTIONS
2. Check the ratings and specifications given in the
Instructions and on the product to assure the product is
suitable for your application.
3. Installer must be a trained, experienced service
technician.
4. After installation is complete, check out the product
operation as provided in these instructions.
CAUTION
Disconnect power supply before wiring to prevent
electrical shock or equipment damage.
Location and Mounting
The ST9103A is mounted in the appliance wiring
compartment using four No. 6 screws (obtained locally)
through standoffs on the corners of the board.
Wiring
All wiring must comply with local codes and ordinances.
Disconnect power before making wiring connections. Refer to
Fig. 1 for standard wiring connections. Refer to Fig. 2 for an
internal schematic.
Setting the Heat Fan Off Delay Switches
Set the heat fan off delay switches to either 60, 90, 120, or
150 seconds, as shown in Fig. 3. The off delay time starts
when the burner motor is de-energized at the end of a
thermostat call for heat.
CHECKOUT
Assure the system operates properly by operating the system
through at least one complete heating cycle and cooling
cycle, if applicable. Troubleshoot by checking for appropriate
voltages at the ST9103A terminals controlling the burner
motor and heat and cool speed circulating fan. The ST9103A
schematic shows internal switching to clarify operation and
assist in troubleshooting. See Fig. 2.
X-XX UL
ST9103A
69-0771B

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  Summary of Contents for Honeywell ST9103A

  • Page 1: Specifications

    4. After installation is complete, check out the product components in the furnace. The basic purposes of the operation as provided in these instructions. ST9103A are to monitor the thermostat for heat, cool, and fan demands and run the oil burner primary control and up to a CAUTION two-speed circulating fan as required.
  • Page 2 MOTOR BURNER MOTOR LIMIT CONTROL THERMOSTAT ORANGE (BLACK) (WHITE) R8991 OIL PRIMARY CONTROL FLAME DETECTOR DENOTES STANDARD TERMINAL. DENOTES OPTIONAL TERMINAL. CAD CELL NOTE: M5551 DENOTES LINE VOLTAGE CONNECTIONS. DENOTES LOW VOLTAGE CONNECTIONS. Fig. 1. Typical ST9103A wiring connections. 69-0771B...
  • Page 3 120 VAC 24 VAC ST9103A OIL R8991 ELECTRONIC LIMIT SENSOR FAN TIMER CIRCULATION R8991 R8891 BLOWER CN6-3 CN6-6 CONTROL THERMOSTAT DENOTES OPTIONAL CONNECTIONS, COMPONENTS AND ACCESSORIES. M5552 NOTE: DOTTED LINES REPRESENT PRINTED CIRCUIT BOARD WIRING. Fig. 2. ST9103A internal schematic. 69-0771B...
  • Page 4 (W terminal is de-energized.) • Heat fan off delay timing begins. When timing is complete, the circulating fan is de-energized. • ST9103A returns to standby mode (oil primary control and circulating fan are off). Burner fails to light. • Oil primary control locks out within lockout timing (timing depends on oil primary control).
  • Page 5 (Optional connectors are available for cool or fan. separate circulating fan speed tap.) • If fan operation is required by a call for heat, cool or fan, the ST9103A switches off the continuous fan speed tap before energizing the other fan speed.
  • Page 6 S9103A ELECTRONIC FAN TIMER Home and Building Control Home and Building Control Helping You Control Your World ¤ Honeywell Inc. Honeywell Limited-Honeywell Limitée Honeywell Plaza 155 Gordon Baker Road P.O. Box 524 North York, Ontario Minneapolis MN 55408-0524 M2H 2C9 69-0771B 69-0771B G.H.
  • Page 7: Installation Instructions

    Emplacement et installation Monter le ST9103A dans l’enceinte où se trouve le câblage à Des bornes de raccordement à un filtre à air électronique et à l’aide de quatre vis numéro 6 (non fournies).
  • Page 8 DE FIN DE COURSE THERMOSTAT ORANGE (BLANC) (NOIR) RÉGULATEUR PRIMAIRE DE MAZOUT R8991 BORNE STANDARD DÉTECTEUR DE FLAMME BORNE FACULTATIVE CELLULE AU NOTE: CADMIUM RACCORDEMENT TENSION SECTEUR MF5551 RACCORDEMENT BASSE TENSION Fig. 1. Schéma de raccordement type du ST9103A. 69-0771B...
  • Page 9 DU LIMITEUR ST9103A R8991 VENTILATEUR DE R8991 R8891 CIRCULATION D’AIR CN6-3 CN6-6 CONTROL THERMOSTAT CONNEXIONS, COMPOSANTS ET ACCESSOIRES FACULTATIFS. MF5552 N.B. LES LIGNES POINTILLÉES REPRÉSENTENT LE CÂBLAGE DE LA CARTE DE CIRCUITS IMPRIMÉS. Fig. 2. Schéma interne du ST9103A. 69-0771B...
  • Page 10 Action Réponse du système Le thermostat commande un appel de chaleur. • Le ST9103A ferme les contacts T-T du régulateur primaire. (Borne W sous tension.) • Le système d’allumage est sous tension et le régulateur primaire met l’appareil de chauffage en marche. Le mazout circule tant que le régulateur détecte une flamme.
  • Page 11 • Le ventilateur de circulation d’air se met immédiatement en (Borne G sous tension.) marche en régime refroidissement. • Le ST9103A peut être configuré en usine pour fonctionner en régime chauffage lors d’une demande de ventilation. Fin de la commande de ventilation du thermostat.
  • Page 12 TEMPORISATEUR ÉLECTRONIQUE POUR VENTILATEUR ST9103A Home and Building Control Home and Building Control Pour la ma trise de votre univers ¤ Honeywell Inc. Honeywell Limited-Honeywell Limitée Honeywell Plaza 155 Gordon Baker Road P.O. Box 524 North York, Ontario Minneapolis MN 55408-0524...