September
2012 Page
36
1) PROBLEM: LOSING PRESSURE IN SYSTEM.
A) Air bleeding out of system will cause pressure loss. When the appliance is fi rst fi lled, it may take 3- 4 days to
purge all the air. Add water as needed until pressure stabilizes.
B) An undersized expansion tank will cause large pressure changes as the system water temperature changes.
C) If pressure consistently drops, it indicates a leak in system. Check joints, fi ttings, relief valves, etc.
2) PROBLEM: UNIT OVER HEATS.
A) Air leaks can cause appliance to overheat. Ensure loading and ash door are sealing properly.
B) Chimney may be creating a natural draw even when the draft blower is not running. Consider installing a shutter
on the draft blower.
C) Fan control aquastat or safety limit aquastat may be set too high. Fan control aquastat must not be set over
180°F. Maximum setting for safety limit aquastat is 190°F.
D) Water is not circulating. If pump is not running or an isolation valve is shut, or an air lock is stopping circulation,
appliance can overheat.
3) PROBLEM: NOT ENOUGH HEAT OUT OF THE APPLIANCE.
If the appliance reaches operating temperature and draft fan shuts off ,
it is working properly. (If draft fan does not shut off , see Problem 4)
Check the following:
A) System water fl ow rate too low This can be caused by:
• The circulating pump may not have enough capacity.
• There could be an air lock in the system. (See Problem 5.)
B) The fan control aquastat may be set too low. Set aquastat up 10° but not over 180°F.
C) The house heating system may not be extracting enough heat from the water. Dust buildup on the baseboard
fi ns or forced air heat exchanger system will reduce heat output.
D) The house heating system may not have enough capacity. More baseboards may need to be added to a
hot water system. In a forced air system, more airfl ow through the heat exchanger will boost output.
E) The fuel quality might be poor. Split, seasoned, hardwoods are recommended.
Contact your installer or system designer for further resolution.
TROUBLE SHOOTING