10
EN
Operation Elite Control
7.1 Understanding the Heating and
Cooling Cycles
The heating and cooling cycles operate differently
depending on the system installed. This section
describes the possible cycles.
7.1.1 Normal Heating or Cooling Cycle
In AUTOMATIC mode, heating and cooling are supplied
as required to meet the cabin temperature set point.
• The system starts a cooling cycle once the cabin
temperature exceeds the temperature set point by
2°F (1°C) and starts a heating cycle once the cabin
temperature falls below the temperature set point by
2°F (1°C). The system continues the cycle until the
cabin temperature equals the set point.
• During a cycle, the cabin temperature must drop
below the set point by at least 4°F (2°C) before the
system switches from cooling to heating or exceed
the set point by at least 4°F (2°C) before the system
switches from heating to cooling. This behavior
prevents small temperature overshoots from causing
the system to switch between heating and cooling
when it is not necessary.
COOL mode supplies cooling only and HEAT mode
supplies heating only.
• The cabin temperature for either mode is maintained
within 2°F (1°C) of the set point by default.
• When the heating or cooling set point is satisfied,
the compressor cycles OFF and the fan returns to low
speed.
In Manual Fan Mode, the fan speed remains constant.
7.1.2 Chilled-Water System Operation
(CW Systems Only)
In CW systems, the water valve does not open unless the
water temperature is adequate to heat or cool the cabin.
The adequate heating or cooling water temperature is
defined by the water temperature differential setting in
the control parameters. Refer to “Selecting a Parameter”
on page 16.
To view the current water temperature, press and hold
Power and Down. Refer to “Using the Control Display
Panel” on page 13. The fan remains on low speed
until the adequate water temperature is available.
I
To provide heat when the required water
temperature is not available, install the optional
auxiliary electric heater and program parameter
P-13. Refer to “Programming the Control” on page
14.
7.1.3 Air and Water Temperature
Differential (CW Systems Only)
The electric heater and the chilled-water heat can affect
the CW system.
The optional auxiliary electric heater overlaps with the
chilled-water heat by 22 °F (12° C). The heater turns on
when required and remains on until the chilled-water
temperature exceeds the ambient air temperature by
22 °F (12° C) or until the room temperature is satisfied.
During very cold conditions, the auxiliary electric heat
overlaps the chilled-water heat to supplement heating.
Water Temperature Differential
in °F
Default is 15 °F (-9°C)
Valve
Auxiliary
Heater
22°F (-6°C) Open Off
15°F (-9°C) Open On
7 to 15 °F (-14 to 9 °C) Hysteresis On
7°F (-14°C) Close On
7 to 0 °F (-14 to -18 °C) Close On
0°F (-18°C) Close Off
0 to -7 °F (-18 to -22°C) Close Off
-7°F (-22°C) Close Off
-7 to -15 °F (-22 to -26°C) Hysteresis Off
-15°F (-26°C) Open Off
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