14
EN
Operation
8 Operation
This section describes the operating features.
Use the main menu settings to adjust the operating
parameters and to fine-tune the system for the most
efficient operation. Variables such as ducting, sensor
location, and system layout affect the system operation.
The control has factory default settings stored in
permanent memory that can be recalled. To return to the
default settings, select main menu > control parameters
> recall defaults.
Reprogrammed, new settings can be saved as
memorized settings, and then recalled and saved at
any time. To use the reprogrammed settings, select
main menu > control parameters > memorize settings,
and recall memorized.
See section “Understanding the
Memory Settings” on page 24“ for more information.
8 .1 Understanding the Operating
Cycles
This section describes how the system responds during
normal heating and cooling cycles.
8 .1 .1 Automatic Mode
Heating and cooling are supplied as required.
A cooling cycle will start when the cabin temperature
exceeds the set point by 2 °F (1 °C) and will continue to
cool until the temperature equals the set point. See the
section set point temperature differential on page 19
for instructions on how to reduce this variation to 1 °F
(1 °C).
To switch from cooling to heating, the cabin temperature
must drop below the set point by at least 4 °F (2 °C).
Similarly, if heating is required, a heating cycle will start
when the cabin temperature is below the set point by
2 °F (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 °C) to switch from heating to cooling.
8 .1 .2 Cool or Heat Mode
Heating and cooling are supplied as selected.
• By selecting cool mode, only cooling is supplied.
• By selecting heat mode, only heating is supplied.
The cabin temperature in either mode is maintained
within 2 °F (1 °C) of the set point by default. See the
section set point temperature differential on page 19
for instructions on how to reduce this variation to 1 °F
(1 °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
“Understanding the Operating Modes” on page 15.
8 .1 .3 CW Systems
This section applies to CW systems only.
When cooling or heating is required, the water valve
will not open unless the water temperature is adequate.
View the water temperature by pressing the temperature
indicator icon until the water temperature is displayed.
The fan remains in low speed until an adequate water
temperature is available. Heat will be supplied when no
heating is available (water temperature is inadequate)
only if the optional electric heater is installed and
programmed.
An adequate cooling or heating water temperature is
defined by the water temperature differential setting,
under CW control parameters. The factory default is
set at a 15 °F (8 °C) differential from the ambient air
temperature.
8 .1 .4 Reversing Valve
This section applies to DX systems only.
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 five minutes.
Summary of Contents for MCS-CTRL
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