Heatmor 200 CSS - Firebox Door Hoses and Elbows Maintenance

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Firebox Door Hoses and Elbows
Principle of the Door Hoses
The door hoses allow water to circulate between the rebox door and
the water jacket.
Operation of the Door Hoses
The door hoses allow water from the water jacket to pass through the
rebox door, through thermal siphoning. Refer to “Firebox Door” for
further details.
Maintenance / Result
Maintaining the door hoses and elbows ensures that water is able to
ow through the door. Build-up (calcium) in the elbows is possible over
time, which slowly reduces the water ow through the door. If water
does not ow freely through the hoses to the rebox door, you may hear
popping sounds in the door. Once the hoses are around ve years old
or if they show signs of wear, they should be replaced. Replacement of
hoses or cleaning of the elbows is always easier if the water is cool rather
than hot. To clean the elbows, remove the hoses and use a pipe cleaning
brush to clear out the build-up.
Removal and Replacement
To remove and replace the door hoses, use the following steps:
1) Turn off power to the air combustion blowers.
2) Ensure that the re in the rebox is extinguished, which
will allow the water to cool.
3) With hose clamps or vice-grips, pinch the door hoses in
the middle of the hose.
4) Before removing the old door hose, cut the new pieces of
door hose, one at 19 inches and the other at 21 inches.
These measurements are critical.
5) Pinch the new door hose in the middle of the hose,
creating a tight seal.
6) Loosen the hose clamps on each end of the door hose.
7) Remove the rst end of the door hose needing
replacement.
8) Push on the end of the new door hose and repeat the steps for the opposite end of the hose.
9) Tighten the hose clamps, securely fastening the door hose to the nipple on the furnace or rebox
door.
10) Remove the vice-grips pinching the door hoses. This will allow water to ow through.
Door Hose
Elbow
Clamping hose
ABSOLUTELY NO FIRE IN THE FIREBOX WHEN PERFORMING
THIS REPAIR. DO NOT PERFORM THIS REPAIR WHEN UNIT
WATER TEMPERATURE IS UNSAFE. ALWAYS WEAR PROPER
PERSONAL PROTECTIVE EQUIPMENT WHEN WORKING
WITH WATER AND CHEMICALS.