Page 7
Controls
The controls shall utilize solid-state electronics.
Operation of the unit shall be controlled through the use
of a touch-pad. The touch-pad shall use no knobs and
shall be liquid tight for easy care and cleaning. The con-
trol shall incorporate digital display of temperature set-
tings, allowing precise comfort selection by user.
The touch-pad shall include an ON/OFF selector, a
MODE selector that will enable the user to select HEAT,
COOL, Cool/Dry or FAN only operation; a FAN selector
that allows high or low speed fan operation; and a TEMP
selector to allow for precise room temperature adjust-
ment.
Operation/mode of the unit shall be easily confirmed
through the use of LED status lights and a soft confirm-
ing beep sound. The LED status lights must be visible
with the control door closed.
The touch-pad shall be designed to be easily removed
from the heating/cooling chassis and mounted to a wall
for remote control without the need or cost of separately
purchased wall-mounted controls. The unit shall retain all
of its features regardless if the touch-pad is mounted on
the wall or unit.
The touch-pad shall be infrared capable for control via
wireless remote controller.
The controls shall incorporate a standard interface for
low voltage connection to dry contacts at a central con-
trol or energy management system.
The electronic controls shall allow the Owner/Facility
Manager to establish the maximum and minimum tem-
perature range for heating and cooling modes (electronic
temperature limiting).
Unit shall have automatic temperature compensating
algorithm (+2°F in HEAT or –2°F in COOL) to minimize
temperature swing and compressor cycling during period
when room is brought to set point temperature after
being off for 2 or more hours. This will automatically
compensate for the cold or warm radiation effect felt
from the mass in the walls, floor, and furnishings until
they normalize. The 2°F offset is maintained for the first
cycle only. After that, the setting reverts to that shown on
the digital display.
The unit shall have two cooling modes (COOL and
COOL/DRY). The Cool/Dry feature shall be
Owner/Facility Manager activated or deactivated by an
internal dipswitch and when activated, be user selectable
through the touch-pad control. When the Cool-Dry mode
is selected, the control algorithm shall slightly extend the
run time of the compressor and low fan without signifi-
cantly changing the room temperature from the user set
point. This feature shall increase dehumidification by up
to 70% when compared to the standard Cool mode.
The touch-pad shall be interchangeable and upgrade-
able with an optional touch-pad that includes Sleep and
Timer functions and shall also be compatible with an
optional wireless infrared remote with these functions.
When the optional touch-pad is present, pressing the
Sleep button shall activate the Sleep feature. The Sleep
mode shall improve comfort and reduce energy con-
sumption by gradually raising the room temperature by
3.6°F from the set-point over two hours in cooling mode,
or lowering the room temperature by 5.4°F over 2 hours
in the heating mode. Pressing the Timer button shall acti-
vate the Timer feature. Each press of the button shall
increase and display the timer setting in hours from 1 to
15. When the timer is activated when the unit is operat-
ing, the unit shall shut off at the selected time interval.
When the unit is off and the timer is activated the unit
will come on at the selected time interval in the control
settings (Mode/Fan/Temperature) that were last set on
the unit.
In the event of a malfunction the control shall provide
self-diagnostics and display an error code to allow easy
identification of service required.
