Honeywell ST7997 manual

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Table of contents for the manual

  • Page 1

    X-XX UL INST ALLA TION INSTRUCTIONS Molex® is a registered trademark of Molex Incorporated. Copyright © 1998 Honeywell Inc. • All Rights Reserved 69-1204 ST7997 Oil Burner Mounted Electric Fan T imer APPLICA TION The ST7997 Oil Burner Mounted Electric Fan Timer integrates control of burner and circulator fan operations in an oil furnace and is [...]

  • Page 2

    69-1204 2 ST7997 OIL B URNER MOUNTED ELECTRIC F AN TIMER Fig. 1. ST7997A,B Oil Burner Mounted Electric Fan Timer dimensions in in. (mm). Mounting: Mounts directly on standard 4 in. (102 mm) by 4 in. (102 mm) junction box. Packaging: Unit pack and bulk pack. Connections: R7997, Oil Burner Motor, Oil Valve and Power (L1, L2): Six (6) 1/4 in. (6 mm) b[...]

  • Page 3

    69-1204 3 ST7997 OIL BURNER MOUNTED ELECTRIC F AN TIMER Fig. 3. ST7997 Oil Burner Mounted Electronic Fan Timer standard wiring connections. N HUM N EAC N 1K2 1K1 2K2 2K1 COOL HEAT MED HI MED LO LO HI BLACK WHITE N CONTINUOUS FURNACE LIMIT OIL PRIMARY L1 L1 L2 L2 BURNER/ VALVE HUMIDIFIER EAC L2 THERMOSTAT 5-WIRE COMPRESSOR CONTACTOR RC RC F1 ISOLATI[...]

  • Page 4

    69-1204 4 ST7997 OIL B URNER MOUNTED ELECTRIC F AN TIMER N HUM N N COOL HEAT MED LO LO HI BLACK RED WHITE VIOLET N OIL PRIMARY L1 L1 L2 L2 BURNER/ VALVE HUMIDIFIER EAC L2 THERMOSTAT 5-WIRE COMPRESSOR CONTACTOR RC RC F1 ISOLATION HEAT CALL CONTROL ELECTRONICS LIMIT RC W R C C G Y G Y G Y L1 GND SCREW TERMINAL 1/4 IN. QUICK CONNECT CIRCULATOR BLOWER [...]

  • Page 5

    69-1204 5 ST7997 OIL BURNER MOUNTED ELECTRIC F AN TIMER N HUM N N MED LO LO HI BLACK RED WHITE VIOLET N OIL PRIMARY L1 L1 L2 L2 BURNER/ VALVE HUMIDIFIER EAC L2 THERMOSTAT 5-WIRE COMPRESSOR CONTACTOR RC RC F1 ISOLATION HEAT CALL CONTROL ELECTRONICS LIMIT RC W R C C G Y G Y G Y L1 GND SCREW TERMINAL 1/4 IN. QUICK CONNECT CIRCULATOR BLOWER LIMIT (LINE[...]

  • Page 6

    69-1204 6 ST7997 OIL B URNER MOUNTED ELECTRIC F AN TIMER Fig. 6. ST7997 Fan Timer location and settings for Heat Fan-Off and Heat Fan-On delay switches. M12918 60 90 120 150 (SHADED AREA IS SWITCH HANDLE POSITION.) FOR SELECTED MODELS ONLY. 1 2 1 2 1 2 1 ON ON ON ON 2 60 45 3 3 HEAT OFF DELAY TIME HEAT ON DELAY TIME 1 1 CHECKOUT Verify system opera[...]

  • Page 7

    69-1204 7 ST7997 OIL BURNER MOUNTED ELECTRIC F AN TIMER Table 2. ST7997 Operating Sequence. Mode Action System Response HEAT Thermostat calls for heat. (W terminal is energized.) a . Thermostat calls for heat (closes oil primary control T-T connections. b . Ignition system and oil primary control start the furnace. Oil flows as long as oil primary [...]

  • Page 8

    69-1204 8 ST7997 OIL B URNER MOUNTED ELECTRIC F AN TIMER Home and Building Control Honeywell Limited-Honeywell Limitée 155 Gordon Baker Road North York, Ontario M2H 3N7 69-1204 G.R. 8-98 Home and Building Control Honeywell Inc. Honeywell Plaza P.O. Box 524 Minneapolis, MN 55408-0524 www.honeywell.com[...]