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Keystoker A-250 Operating Instructions Manual

Warm air furnace

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A-250, A-350, & A-450 Warm Air Furnace
Operating instructions and maintenance enclosed
Thoroughly read and understand instructions
Always leave this manual with stove owner
Follow the instructions within this manual. If instructions are not
followed, a fire may result causing property damage, personal injury, or
even death.
A carbon monoxide detector has been supplied with your stove. You must
plug it in.
Danger risk of fire or explosion. Do not burn garbage, gasoline, drain oil,
or other flammable liquids. Do not use chemicals or fluids to start fire.
Burn rice or buckwheat anthracite coal only
Stoves surfaces may be hot while in operation. Keep children away. Do
not touch during operation
Do not connect this unit to a chimney flue serving another appliance.
Follow all local building and Zoning ordnances

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Summary of Contents for Keystoker A-250

  • Page 1 A-250, A-350, & A-450 Warm Air Furnace Operating instructions and maintenance enclosed Thoroughly read and understand instructions Always leave this manual with stove owner Follow the instructions within this manual. If instructions are not followed, a fire may result causing property damage, personal injury, or even death.
  • Page 2 Tighten nuts securely in an alternative diametric patter to slightly compress the rope seal between flanges. 6. Install (4) heat exchanger legs (rear legs are cut on an angle) (A-250 only has 2 rear legs). After connecting heat exchanger and furnace with bolts, front legs MUST be removed from heat exchanger.
  • Page 3 INSTALLATION INSTRUCTIONS FOR A-250, A-350, & A-450 12. Place stack bib over stack and clean out ports and fasten with screws. 13. Install blank plate over unused fire door hole in the jacket. 14. Crawl under heat exchanger and slide bottom partition against angles on inside of jacket.
  • Page 4 INSTALLATION INSTRUCTIONS FOR A-250, A-350, & A-450 spring handle and thread it through predrilled hole in fire door handle. Then re- bend spring handle closed. Also found in ash tub. Fasten jacket panels to floor slot and top slot, by drilling 1/8” holes and securing with sheet metal screws.
  • Page 5 INSTALLATION INSTRUCTIONS FOR A-250, A-350, & A-450 which must go inside stoker opening. Place a thick smear of furnace cement on flange of stoker and tilt into place. Secure with 3/8 x 1 ¼” machine screws, washers, and nuts. Place hopper on stoker unit. Place hopper support bar in hopper on bolts and fasten hopper and support bar (A-250s do not have support bar) to furnace with large sheet metal washers and nuts.
  • Page 6 INSTALLATION INSTRUCTIONS FOR A-250, A-350, & A-450 reduced at chimney thimble. Install barometric draft control in first full section of stack closest to furnace. Follow instructions packed with draft control, making sure draft control bearings are level and face of control is perpendicular to floor.
  • Page 7 INSTALLATION INSTRUCTIONS FOR A-250, A-350, & A-450...
  • Page 8 INSTALLATION INSTRUCTIONS FOR A-250, A-350, & A-450...
  • Page 9 INSTALLATION INSTRUCTIONS FOR A-250, A-350, & A-450 1. Stoker Body 14. Pusher bar drive shaft 2. Side Rail Left K-2C 15. Bearing K-17 3. Side Rail Right K-1C 16. Feed Crank K-7 4. Grate K-15-1-L 17. Feed Assembly Connector 5. Grate K-15-2-L 18.
  • Page 10 INSTALLATION INSTRUCTIONS FOR A-250, A-350, & A-450 STARTING FIRE: NOTE DO NOT USE AN ACCELARANT SUCH AS; gasoline, kerosene or litter fluid. Put dry coal in hopper, pull coal to cover entire grate. Crush several charcoal briquettes into smaller pieces on one sheet of newspaper.
  • Page 11 INSTALLATION INSTRUCTIONS FOR A-250, A-350, & A-450 groups of clips. Or if in case of chimney having poor draft, clips may be placed in 3 groups at numbers 0 – 10 -20. Coal Feed (Red Nut) To Increase Coal feed and fire size, turn red nut CW...
  • Page 12 As prices of fuel continue to increase KEYSTOKER, continues to improve and make its products more fuel efficient. To obtain a more complete burn out coal, a small secondary blower motor was attached to the stoker unit.
  • Page 13: Controls And Their Functions

    INSTALLATION INSTRUCTIONS FOR A-250, A-350, & A-450 CONTROLS AND THEIR FUNCTIONS THERMOSTAT: Top pointer is desired room temperature. Bottom pointer is thermostat. When room temperature drops below setting, combustion blower and gear motor will start. When room temperature rises, gear motor will stop (see diagram pg.
  • Page 14: Fan Limit Switch

    INSTALLATION INSTRUCTIONS FOR A-250, A-350, & A-450 THERMOSTAT Top pointer is to be set at warmth desired in home. Bottom pointer is the present temperature in room. When room temperature (bottom pointer) below desired room temperature, (top pointer), this will send a signal to the...
  • Page 15 INSTALLATION INSTRUCTIONS FOR A-250, A-350, & A-450 CONVECTION BLOWER-when running, it will take cool air from room, and force it through heated air chamber inside stove, and return heated air into room. Blower can only be activated by Fan Limit Switch.
  • Page 16 INSTALLATION INSTRUCTIONS FOR A-250, A-350, & A-450 The burning coals should be the width of the grate and about 1 ½” to 2” in length. If the burning coals get any less than 1 ½” the fire may go out.
  • Page 17 INSTALLATION INSTRUCTIONS FOR A-250, A-350, & A-450 SAFETY THE BURNING OF FOSSIL FUELS GENERATES CARBON MONOXIDE GASES. CARBON MONOXIDE GASES ARE TOXIC, CAN CAUSE SICKNESS, AND CAN BE FATAL. To prevent toxic carbon monoxide gases from entering the home, certain precautions must be taken.
  • Page 18: Troubleshooting Hints

    INSTALLATION INSTRUCTIONS FOR A-250, A-350, & A-450 TROUBLE SHOOTING HINTS PROBLEM POSSIBLE CAUSE REMEDY Stoker runs but Feed nut backed off Increase feed-see preceding doesn’t feed coal too far. instructions. Obstruction in throat Empty hopper and remove of stoker. obstruction.
  • Page 19 INSTALLATION INSTRUCTIONS FOR A-250, A-350, & A-450 TROUBLE SHOOTING HINTS PROBLEM POSSIBLE CAUSE REMEDY Stoker doesn’t run Main circuit breaker tripped Reset Main fuse blown Replace Fuse on stoker blown Replace Motor out on reset Press rest button on motor...
  • Page 20 INSTALLATION INSTRUCTIONS FOR A-250, A-350, & A-450...
  • Page 21 INSTALLATION INSTRUCTIONS FOR A-250, A-350, & A-450 WARM AIR CHECKLIST _____ Thermostat _____ Blower Motor _____ Draft Regulator _____ Control-Relay, Timer, and Limit Switch _____ Instructions _____ Spring Handle _____ (2) 3/8 Bolts _____ (6) 3/8 Washers _____ (4) Hopper Washers...

This manual is also suitable for:

A-450A-350