Maintenance - Dometic DF Series Service Manual

8 MAINTENANCE

 Failure to obey these warnings could result in death or serious injury
• SERVICE HAZARD.
– Installation, repairs and preventative maintenance should be done by a qualified service person only.
– The furnace should be inspected before use and at least annually, by a qualified service person only.
• ELECTRICAL SHOCK, FIRE, EXPLOSION, AND/OR CARBON MONOXIDE HAZARD. Use only Dometic
replacement parts and components, which are specifically approved for use with the Furnace.
8.1 Technician's Periodic Maintenance Schedule
The following preventive maintenance and safety checks should be performed once a year, or as needed,
depending on the use of the furnace. Failure to properly maintain the furnace may void the furnace warranty and
could result in unsafe furnace operation. Preventive maintenance is not covered under the furnace warranty.
Burner
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The burner head requires no adjustment.
➤ Clean the burner head with a wire brush to remove
debris and corrosion.
➤ Inspect the screen area for distortion or large holes.
➤ Replace the burner, if necessary. Refer to
the burner head (on page 31).
Blower Wheel
➤ Inspect the wheel to make sure it is clean and free
from obstructions.
➤ Replace the wheel if it is damaged. Refer to
Servicing the burner head (on page 31).
Combustion Chamber
➤ Inspect the air intake and flue for internal debris or
obstructions, such as wasp or bird nests.
➤ Remove any foreign material.
➤ Clean the combustion chamber by removing the
unit and flushing it with water.
➤ Inspect the chamber for cracks and holes. Replace
the unit if any cracks or holes are visible.
➤ Refer to Servicing the combustion wheel (on page
33).
Combustion Wheel
➤ Inspect the wheel to make sure it is clean and free
from obstructions.
➤ Replace the wheel if it is damaged. Refer to
Servicing the combustion wheel (on page 33).
Circuit Board
➤ Check the circuit board wiring. Refer to
of operation/wiring diagrams (on page 9)
➤ Check the ground connections:
– Pull your ground, strip the ground, then
reattach the ground to the circuit board.
– Refer to Servicing the circuit board (on page
32).
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Control Compartment
➤ Clean the control compartment, removing any dirt
or lint.
Ducts
➤ Confirm the heat ducts are clean and clear of
obstructions. Clean the ducts as necessary.
Servicing
➤ Check for proper duct connection. Any ducts
disconnected from the furnace or outlets must be
reattached.
➤ Check that there are not rugs or other obstructions
covering the registers.
➤ Check the registers. If closeable registers
have been used, confirm the ducts system
meets minimum ducting requirements (refer to
installation manual for specific model of furnace).
➤ Replace any damaged ducts. Replacement ducts
must be rated for a minimum of 200 °F.
➤ Refer to
Gas Pressure
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Improper gas pressure can cause the furnace
to work inconsistently and create unbalanced
combustion, resulting in sooting or premature
failure of the heat chamber. The gas pressure
must be 11 in. W.C. (water column) or 27 mbar.
➤ To test the gas pressure:
– Turn on the furnace and a minimum of 50% of
the gas appliances.
– Use the U-tube manometer to measure the gas
pressure.
➤ Refer to
Sequence
Gas Supply System
➤ Perform a pressure-drop test according to current
ANSI standards, to ensure there are no gas leaks.
Heating Issues (on page 26).
Heating Issues (on page 26).
Furnaces
EN