J&R MANUFACTURING 250R-FS, Operation And Service Manual

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9. S
MOKE
L
EAKS
Check for proper EVAC fan function. Has the unit been cleaned as per
the schedule in the cleaning maintenance section? Check the gaskets for
proper seal (see the cleaning maintenance section for adjustment details). If
gaskets are to be replaced it is important to remove all old gasket material
and mastic material and clean with solvent to degrease before installing a
new gasket. Use RTV silicone as mastic.
10. S
OOTING ON
M
EAT
.
The wood being used is either too dry, too much wood is being used, or
the unit is not venting properly. Check the flues and baffles for obstructions.
Check the stack for buildup. Check the EVAC fan function and verify the
operation of the flue damper.
11. C
OOKING
F
AST OR
S
LOW
.
If the temperature is holding at the set point, then check the thermostat
calibration. If over-riding, then check all the gaskets, the Flue Damper
Motor, and the Combustion Air Damper Motor. If the temperature is under-
riding or is sluggish to respond, then check for flue or baffle obstructions,
stack buildup, EVAC fan function, Combustion Air Damper Motor function,
and check the Flue Damper Motor function.
12. U
NEVEN
C
OOKING
.
Check the Convection Fan operation. Clean the convection fan cowling
and the convection fan impeller.
13. “P
OOFING
” – P
RESSURIZATION
D
URING
O
PERATION
.
Unburned combustible gases can be driven off a wood fire when the fire
is oxygen deprived. When oxygen is reintroduced, these gases ignite and
result in a pressure increase. For this reason there is a 60 second delay in
every combustion air cycle. The flue damper and EVAC dampers open
immediately and after the delay of 60 seconds combustion air flows into the
firebox. If pressurization is observed check the Combustion Air Delay Timer.
If the delay time is correct, then check for proper drafting of the unit.
Pressurization usually results from improper firing of the unit. Green
wood is required. Dry wood can cause the pressurization problem. Too
much wood in the firebox can also be the culprit. The problem is directly
related to the rate of combustion (dry wood burns faster) and surface area
(quantity of fuel). Charcoal should not be used as a fire-starting aid due to
its large surface area.
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