Air-Conditioning System; Thermostatic Controls - Tiffin Motorhomes Allegro Bus 2011 Owner's Manual

Air Conditioning System
The factory-installed air-conditioning system is designed for 120 VAC power supplied either from the
external power hookup cord or from the generator. Any unnecessary interior heat loading (e.g., exposure
to direct sunlight for long periods of time; transmittance of sunlight through the windows) will work the
air conditioning system harder and may compromise the desired results.
conditioning system is to be used, park the motor home in a shady location whenever possible and close
drapes on those windows exposed to direct sunlight. Additionally, any heat-producing sources (e.g.,
oven, unnecessary lights) within the motor home will work against the air conditioning system; so strive
to minimize their use.
The air conditioning system is the major consumption device of electrical power in the motor home.
When this system is being used in an RV park, cumulative use of these air-conditioning systems by the
resident motor homes can create, at times, a bigger demand for electrical power than is actually available.
Accordingly, at such times a "brown-out" condition may arise—this is when the AC voltage normally
available drops to a lesser value (e.g., 10-20% below normal or more).
"Brown-out" conditions cause appliances to draw greater currents to make up for the reduced voltage;
thereby causing circuit breakers to trip or fuses to blow. Under such conditions, your own motor home
is not at fault; simply reset your breakers and/or replace your fuses. Should such conditions continue,
one may wish to turn reduce the electrical load (in this case, turn "off" the air conditioning system for
awhile) or start the electrical generator.
To cool the motor home, the thermostat inside the Allegro Bus is used—this
is the same thermostat which controls the furnace functions (described
earlier). The air-conditioned, cooled air is emitted through the vents which
are located in the roof throughout the entire coach. The discharge and return
air vents run parallel, front to back, on the ceiling. Note that the return vents
are similar to the air conditioning vents. This system allows even distribution
for the returns instead of forcing an excess amount of return air through two
smaller openings. The even return system takes more of the hot air from the
motor home, thereby providing cooler air throughout the unit. The air
conditioning vents that are mounted on the ceiling are round vent filters
(Figure 3-5) that need to be periodically checked for dust accumulation. When dust has accumulated on
the filters, remove them and wash in a mild detergent and warm water.

Thermostatic Controls

The following is a brief overview of how best to use the thermostat (Figure 3-
6). For more detailed instructions, please consult the thermostat literature in
the Owner's Information Package.
1. Move power switch to ON.
2. Depress the MODE button to select function. (COOL*, FURNACE,
H E A T I N G & A I R
3-5
C O N D I T I O N I N G
Accordingly, if the air
Figure 3-5. Round
Vent/Filter
Figure 3-6. Thermostat