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INSTALLING THE DISPLAY PANEL
M
EMORY
When the Smart Touch losses power, the operating parameters are retained for up to 2 years. When power is restored, the
control resumes operating as last programmed. The Smart Touch has a battery backup. If the battery backup is removed, only
time and date settings will be lost.
N
H
ORMAL
EATING OR
In Automatic Mode, heating and cooling are supplied as required. If cooling is required, the system will start a cooling cycle
when the cabin temperature exceeds the set point by 2°F (1.1°C) and will continue to cool until the temperature equals the set
point. (See "General Setting, Set Point Temperature Differential", on page 13 for instructions on how to reduce this variation to
1°F [0.55°C].) The cabin temperature must drop below the set point by at least 4°F (2.2°C) in order for the system to switch from
cooling to heating. Similarly, if heating is required, the system will start a heating cycle when the cabin temperature is below the
set point by 2°F (1.1°C) and will continue to heat until the temperature equals the set point. The cabin temperature must exceed
the set point by at least 4°F (2.2°C) in order for the system to switch from heating to cooling. If you select Cool Mode, only
cooling is supplied. If you select Heat Mode, only heating is supplied. The cabin temperature in either mode is maintained within
2°F (1.1°C) of set point by default. (See "General Setting, Set Point Temperature Differential", on page 13 for instructions on
how to reduce this variation to 1°F [0.55°C].) When the heating or cooling set point is satisfied, the compressor cycles off and
the fan returns to low speed. The fan speed remains constant if Manual Fan Speed is selected. For more information on this
feature, see "Modes of Operation" on page 9.
(For CW systems only)
When cooling or heating is required, the water valve will not open unless the water temperature is adequate. You can view
the water temperature by pressing the Temperature indicator icon until the Water temperature is displayed. The fan remains in
low speed until the adequate water temperature is available. Heat will be supplied when no heating is available (water
temperature is inadequate) only if the Optional Electric heater has been installed and programmed.
Adequate cooling or heating water temperature is defined by the Water Temperature Differential setting, under CW Control
Parameters. Its factory default is set at 15°F (8.3°C) differential from the ambient air temperature.
R
V
EVERSING
ALVE
The position of the reversing valve determines if the system is in Cool Mode or Heat Mode. In addition, the reversing valve is
programmed to toggle in these situations:
•
When the system is running and heating or cooling is required, the reversing valve toggles to the opposite mode to
reduce the starting surge of the compressor.
•
When a cooling or heating cycle is called for and if the system has been off for less than 5 minutes.
•
When a cycle is interrupted from the display panel by pressing the Power icon or changing the set point.
Unnecessary valve toggling is limited to reduce reversing valve noise. You can totally eliminate valve toggling by programming
the minimum compressor staging delay to 5 minutes or greater (see "DX Operational Setting Compressor Start Delay" on
page 15 for more information). Power-On Reset, which occurs when the system is powered up, always initiates a valve toggle.
INSTALLING THE DISPLAY PANEL
C
HOOSING THE
Figure 3: Smart Touch Display Front Panel
4
C
OOLING
O
PERATION
L
OCATION
Smart Touch Cabin Control Installation & Operations Manual
C
YCLE
(F
DX S
OR
YSTEMS
O
)
NLY
L-3380 ENGLISH
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