Keystoker Ka-6 operation guide.

Learning your Keystoker Ka-6 Boiler and having some questions this post will help you understand certain key elements on it. Reviewing this post should help you to understand the operation of the boiler.

Keystoker has a pre-drilled hole in fire door to check draft. Use manometer to check draft during demand for heat. Draft needs to be -.02


Air Shutter (located on bottom of scroll between stoker motor and gear box about ½”)


Secondary Blower will force a small amount of air through grates at all times, which will cause the ash to become like powder. It also prevents the fire from
going out



Proper sizing of fire is obtained by turning red nut on feed control arm



Timer Setting and pin placements is key to keep fire going during idle time.. Less demand for heat ( warmer weather) more pins. More demand for heat( cold weather) less pins needed since demand time will be greater



Each timer pin equals 15 seconds



Proper burn during demand for heat.



Cleaning under grates can be achieve by removing secondary blower. Total of 4 screws.

Great job wiz. also ive had great response with aqua stat settings of 150 lo 200 hi. never gets below 140 prevents condensation. nice wide span allows for better responses imo. hopefully other members will chime in with settings.

Fantastic post.

I was wondering if this would also apply to my KAA-2? One thing I think maybe I am messing up with is the # of pins for the Heating Season. I have added pins since Summer. Now I need to dig out the manual and see where I went wrong!

Outstanding Wiz!!

Kungur wrote:I was wondering if this would also apply to my KAA-2? One thing I think maybe I am messing up with is the # of pins for the Heating Season. I have added pins since Summer. Now I need to dig out the manual and see where I went wrong!

Whooooo there Kungur. Slow down.... No need to dig out manual. The Kaa-2 runs just the opposite on timer pins. I don't think it was engineered to be run the opposite of other stoker boilers but, that's how it needs to be run. The Kaa-2 needs a hotter fire (more pins) for quicker recovery, due to it's smaller 24 gallon water capacity. You're not wasteing coal during no call for heat, as the heat is being stored in the water. Unless the space to be heated is really really small, and well insulated, the Kaa-2 needs to be run on the timer during the cold months. This time of year, I'm running 3 groupes of 5 pins, and 3-3/4 turns counter clockwise on the stoker ajustment. Water capacity is why I think KEYSTOKER should have NOT done away with the Ka-4. Instead, they done away with Ka-4, and come out with the smaller Kaa-2 to take it's place. Oliver PS: By the way Wiz, Very Nice!

If the timer cycles don't cause the boiler to overheat during periods of low demand, I would leave it alone.

Ka-6 burning Casey Kassa buckwheat coal.. Remember everyone's settings will vary to some degree, make small adjustments to achieve the best burn. Ka-6 is running better since switching to buck.