EWAQ+EWYQ009~011ACV3 + EWAQ+EWYQ009~013ACW1
Packaged air-cooled water chillers and packaged reversible air to
water heatpumps
4PW51588-1
Operation manual
4
Description of the operation modes
Heating operation (
h)
In this mode, heating will be activated as required by the water
temperature set point. The set point can be set manually (refer to
"Manual operation" on page 4) or weather dependent (refer to
"Selecting weather dependent set point operation (heat pump models
only)" on page 4).
Startup (d)
At the start of a heating operation, the pump is not started until a
certain refrigerant heat exchanger temperature is reached. This
guarantees correct startup of the heat pump. During startup, icon
d is displayed.
Defrost (d)
In heating operation, freezing of the heat exchanger may occur due
to low outdoor temperature. If this risk occurs, the system goes into
defrost operation. It reverses the cycle and takes heat from the indoor
system to prevent freezing of the system. After a maximum of 8
minutes of defrost operation, the system returns to heating operation.
Cooling operation (c)
In this mode, cooling will be activated as required by the water
temperature set point.
Quiet mode operation (s)
Quiet mode operation means that the unit works at reduced capacity
so that the noise produced by the unit drops. This implies that the
indoor heating and cooling capacity will also drop. Beware of this
when a certain level of heating is required indoors.
Two quiet modes are available.
Controller operations
Manual operation
In manual operation, the user manually controls the settings of the
installation. The last setting remains active until the user changes it or
until the schedule timer forces another setting (refer to "Schedule
timer operation" on page 5).
As the controller can be used for a wide variety of installations, it is
possible to select a function which is not available on your
installation. In that case the message n will appear.
Switching on and setting cooling (c) and heating (h)
1 Use the = button to select cooling (c) or heating (h).
Icon c or h appears on the display as well as the corresponding
water temperature set point.
2 Use the bi and bj buttons to set the desired water
temperature.
•Temperature range for heating: 25°C to 55°C
•Temperature range for cooling: 5°C to 22°C
3 Switch on the unit by pushing the
y button.
The operation LED 0 lights up.
Selecting quiet mode operation (s)
1 Use the s button to activate quiet mode operation (s).
Icon s appears on the display.
If the controller is set in permission level 2 or 3 (refer to "Field
settings" on page 9), the s button will not be operable.
Selecting weather dependent set point operation (heat pump
models only)
1 Press the ba button to select weather dependent set point
operation.
Icon a appears on the display as well as the shift value. The
shift value is not shown in case it is 0.
2 Use the bi and bj buttons to set the shift value.
Range for the shift value: –5°C to +5°C
Displaying actual temperatures
1 Push the ba button for 5 seconds.
The
b icon and the outgoing water temperature are displayed.
The icons
l and = are flashing.
2 Use the pi and pj buttons to display:
• The outdoor temperature (
u icon is flashing).
• The outgoing water temperature (
= are flashing).
If no button is pressed for 5 seconds, the controller leaves the
display mode.
NOTE
Defrosting stops:
■ when switching between cooling and heating,
■ at a low outdoor temperature and a low
temperature of the incoming water,
■ when the desired defrost temperature is reached,
i.e. defrost stop temperature (contact your local
dealer).
Heating operation restarts automatically when the
water temperature is above the defrost stop
temperature.
NOTE
Heating operation is not possible if the installation is a
"cooling only" installation.
NOTE
■ The cooling temperature set point can only be set
manually (refer to "Manual operation" on page 4).
■ Switching between heating and cooling operation
can only be done by pressing the = button or by
an external room thermostat. (Provided the unit is
not a "cooling only" unit)
NOTE
In heating mode (h), the water temperature set point
can also be weather dependent (icon
a is shown).
This means that the controller calculates the water
temperature set point based on the outdoor temperature.
In this case, instead of showing the water temperature
set point, the controller shows the "shift value" which
can be set by the user. This shift value is the
temperature difference between the temperature set
point calculated by the controller and the real set point.
E.g. a positive shift value means that the real
temperature set point will be higher than the calculated
set point.
NOTE
When the unit is connected to an external room
thermostat, buttons = and y are not operable and
the icon e is shown. In this case, the external room
thermostat switches the unit on or off and determines
the operation mode (cooling or heating).
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