Landmark 365 User Manual - page 28
Heartland Owners Forum
http://manuals.heartlandowners.org
Landmark 365 User Guide V1.1.pdf
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Version 1.1, March 10, 2016
To provide venting, a Studor Air-Admittance Valve is used. The vacuum effect causes the one-way valve
to open, admitting air, which breaks the vacuum and prevents the water in the p-trap from being sucked
out.
If the Studor Valve sticks open or fails altogether, sewer gas can enter the coach through the valve.
Replacement valves are inexpensive and can be obtained at most big-box hardware stores.
While failure of the Studor Valve is not all that common, if you have a persistent sewer odor in the
coach, you should check under the sink to see if a Studor Valve is present. Cover it with a plastic baggy
secured by a rubber band. If the odor goes away, the valve should be replaced.
Heating and Cooling
Furnace
The furnace is controlled by one of the air conditioner thermostats inside the coach. While you may
have up to three thermostats, with each thermostat controlling a separate air conditioning unit, only
one of those thermostats is wired to control the furnace - usually the rearmost thermostat.
The thermostat will cycle the furnace on and off based on the ambient temperature at the location of
that thermostat. Temperatures inside a 40 foot long RV usually differ by several degrees from front to
rear. Also, warm air rises, so a front bedroom that’s higher than the living room will always have more
warm air than the rear of the coach. In addition, the furnace is usually located closer to the front of the
coach, pushing hotter air through the ducts to the front bedroom and bath. By the time air goes the
longer distance to the rear of the coach, it will not be as warm coming out of the rear floor registers.
You’ll need to set the thermostat to provide a comfortable temperature in the part of the coach that
you’re using at any particular time.