EWAQ016~ EWYQ016~064BAW
Packaged air-cooled water chiller
4PW70082-1C – 2013.07
Installation and operation manual
20
[3] Weather dependent set point
When weather dependent operation is active, the leaving water
temperature is determined automatically depending on the outdoor
temperature: colder outdoor temperatures will result in warmer water
and vice versa. The unit has a floating set point. Activating this
operation will result in a lower power consumption than use with a
manually fixed leaving water set point.
During weather dependent operation, the user has the possibility to
shift up or down the target water temperature by a maximum of 5°C.
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.
It is advised to use the weather dependent set point because it
adjusts the water temperature to the actual needs for space heating.
It will prevent the unit from switching too much between thermo ON
operation and thermo OFF operation when using the remote
controller room thermostat or external room thermostat.
■
[3-00]
Low ambient temperature (Lo_A): low outdoor
temperature.
■
[3-01]
High ambient temperature (Hi_A): high outdoor
temperature.
■
[3-02]
Set point at low ambient temperature (Lo_Ti): the target
outgoing water temperature when the outdoor temperature
equals or drops below the low ambient temperature (Lo_A).
Note that the Lo_Ti value should be higher than Hi_Ti, as for
colder outdoor temperatures (i.e. Lo_A) warmer water is
required.
■
[3-03]
Set point at high ambient temperature (Hi_Ti): the target
outgoing water temperature when the outdoor temperature
equals or rises above the high ambient temperature (Hi_A).
Note that the Hi_Ti value should be lower than Lo_Ti, as for
warmer outdoor temperatures (i.e. Hi_A) less warm water
suffices.
[4] Settings are not applicable
[5] Automatic setback
■
[5-00]
Setting is not applicable.
■
[5-01]
Setting is not applicable.
■
[5-02]
Leaving water setback temperature.
■
[5-03]
Room temperature setback.
■
[5-04]
Setting is not applicable.
[6] Option setup
■
[6-01]
External room thermostat option
If the optional external room thermostat is installed, its operation
must be enabled by field setting. Default [6-01]=0, which means
no external room thermostat is installed. Set [6-01] to 1 or 2 if
the optional external room thermostat is installed.
The external room thermostat only gives an ON/OFF signal to
the heat pump based on the room temperature. Because it does
not give continuous feedback information to the heat pump, it is
supplementary to the remote controller room thermostat
function. To have a good control of the system and avoiding
frequent ON/OFF it is advised to use the automatic weather
dependent set point operation.
■
[6-01]
=1
Room thermostat input 1 = heating operation ON (1)/OFF (0)
Room thermostat input 2 = cooling operation ON (1)/OFF (0)
■
[6-01]
=2
Room thermostat input 1 = operation ON (1)/OFF (0)
Room thermostat input 2 = cooling (1)/heating (0) selection
■
[6-03]
Negative leaving water temperature setting
This setting is only applicable for units with a low temperature
cooling option below 0°C ([A-04]=1).
It is not possible to set negative leaving water temperature
settings directly on the remote controller. This has to be done
through this setting.
Example: [6-03]=–5 sets negative leaving water temperature set
point to –5°C.
[7] Option setup
■
[7-00]
Forced pump operation
■
[7-00]
=0 the pump performs intermittent sampling during
thermo off conditions. This setting is often used when the unit
is controlled by a room thermostat.
■
[7-00]
=1 the pump continues operation during thermo off
conditions (default)
[8] Option setup
■
[8-00]
Remote controller temperature control
■
[8-00]
=0 the unit operates in leaving water temperature
control. This is the default setting.
■
[8-00]
=1 the unit operates in room temperature control. This
means that the remote controller is used as room thermostat,
so the remote controller can be placed in the living room to
control the room temperature.
■
[8-01]
Setting is not applicable
■
[8-03]
Setting is not applicable.
INFORMATION
Only for EWYQ units operating in heating mode.
Setback function for cooling does not exist.
T
t
Target water temperature
T
A
Ambient (outdoor) temperature
Shift value
= Shift value
INFORMATION
If by mistake the value of [3-03] is set higher than the value
of [3-02], the value of [3-03] will always be used.
Lo_Ti
Lo_A
Hi_A
T
A
T
t
+ 05
00
– 05
Hi_Ti
Shift value
INFORMATION
The unit will only accept this negative leaving water
set point when leaving water set point on the remote
controller display is set to 0°C (after changing [C-03]
to 0) and the field setting [A-04]=1.
4PWEN70082-1C.book Page 20 Wednesday, September 25, 2013 7:31 AM
Summary of Contents for EWAQ016BAW
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