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802961 Rev. 00
comfortable setting is determined and set, no other
adjustments are necessary.
Over-adjusting the thermostat will not increase the rate at
which the unit will heat or cool the space; it is merely an on-
off switch that responds to temperature.
Fan speeds in heating and cooling operation are controlled
by a “Fan Speed” knob. Rotate the knob to the right of “0”
for cooling operation, and to the left of “0” for heating
operation. Rotation of the knob changes fan speed as
follows:
3 = High Speed 2 = Low Speed 1 = Low Speed
ATTENTION:
When operating in cooling mode, if the
compressor is shut off by rotation of the “Temperture” or
“Fan Speed” dial, then wait for 3 minutes before re-starting
the compressor.
Figure
Thermostat Temperature Limiting Feature
The purpose of temperature limiting is to allow the property
owner to control the maximum and minimum temperature
that an end-user can obtain during operation of the unit, and
can be an important energy saving feature. This is
accomplished by limiting the thermostat knobs range of
rotation between preset limits set by the property owner. The
unit is shipped from the factory allowing a wide range of
rotation. Altering the range of rotation is easily done.
Remove the thermostat knob by pulling it with sufficient
force—DO NOT PRY. Turn the knob over and observe the
plastic rib coming off the side of the knob stern. The rib is
designed to engage limiting stop screws that can be arranged
to limit the maximum and minimum set-point temperatures
for the thermostat. On the dial plate, just below the
thermostat shaft you will notice two Phillips head screws
(with washers) in “Standard Position” (see Fig. 1). This
allows a wide range of thermostat rotation, representing a
range of temperatures between approximately 18°C and
29°C (65ºF and 85ºF). The left screw in Standard Position
can be removed and re-inserted in four alternate holes
moving in a clockwise direction in order to reduce the
maximum allowable set-point temperature for heating.
Similarly, the right screw can be relocated in four alternate
holes moving in a counter-clockwise direction to increase
the minimum allowable set-point for cooling. Moving to the
next screw location alters the set point limit by about 1.4ºC
(2.5ºF) (see Fig 2).
For example, moving the left screw clockwise 4 positions
over from Standard Position limits the maximum heating
set-point temperature to 29.4ºC – (4 x 1.4ºC) = 23.8ºC (85ºF
– (4 x 2.5ºF) = 75ºF). Similarly, moving the cooling set-
point right screw counter-clockwise 2 positions over from
Standard Position limits the minimum temperature to 18.3ºC
+ (2 x 1.4ºC) = 21.1ºC (65ºF + (2 x 2.5ºF) = 70º F).
Therefore in this example roughly speaking, the end user
cannot heat the room to greater than 23.9°C (75ºF) nor cool
the room to less than 21.1°C (70ºF) .Experimentation may
be necessary to obtain a desirable setting. Keep in mind that
the actual thermostat temperature sensing occurs at the
sensing bulb in the return air stream, sensing air being pulled
in through the bottom of the front panel near the floor.
NOTE : IF THE ROOM TEMPERATURE IS STILL NOT
SATISFACTORY AT THE COOLEST THERMOSTAT
SETTING, THEN COMPLETELY REMOVE THE RIGHT
HAND LIMITING STOP SCREW.
Before reinstalling the knob, manually turn the thermostat
shaft so that the rib under the knob will locate in between the
stop screws once the knob is installed. Failure to follow this
step will yield an unintended temperature range.