Specifications

Installation and operation manual
40
RXYQQ8~20T7Y1B
VRV IV System Air Conditioner
4P345099-1 – 2013.04
15.3. Energy saving and optimum operation
This VRV IV replacement heat pump system is equipped with
advanced energy saving functionality. Depending on the priority,
emphasises can be put on energy saving or comfort level. Several
parameters can be selected, resulting in the optimal balance between
energy consumption and comfort for the particular application.
Several patterns are available and explained below. Modify the
parameters to the needs of your building and to realize the best
balance between energy consumption and comfort.
15.3.1. Three main operation methods are available:
 Basic
The refrigerant temperature is fixed independent from the
situation. It corresponds to the standard operation which is
known and can be expected from/under previous VRV systems:
 To activate this operation method under cooling operation:
change field setting [2-8]=2.
 To activate this operation method under heating operation:
change field setting [2-9]=6.
 Automatic
The refrigerant temperature is set depending on the outdoor
ambient conditions. As such adjusting the refrigerant
temperature to match the required load (which is also related to
the outdoor ambient conditions).
E.g., when your system is operating in cooling, you do not need
as much cooling under low outdoor ambient temperatures (e.g.,
25°C) as under high outdoor ambient temperatures (e.g., 35°C).
Using this idea, the system automatically starts increasing its
refrigerant temperature, automatically reducing the delivered
capacity and increasing the system's efficiency.
 To activate this operation method under cooling operation:
change field setting [2-8]=0 (default).
E.g., when your system is operating in heating, you do not need
as much heating under high outdoor ambient temperatures (e.g.,
15°C) as under low outdoor ambient temperatures (e.g., –5°C).
Using this idea, the system automatically starts decreasing its
refrigerant temperature, automatically reducing the delivered
capacity and increasing the system's efficiency.
 To activate this operation method under heating operation:
change field setting [2-9]=0 (default).
 Hi-sensible/economic (cooling/heating)
The refrigerant temperature is set higher/lower (cooling/heating)
compared to basic operation. The focus under high sensible
mode is comfort feeling for the customer.
The selection method of indoor units is important and has to be
considered as the available capacity is not the same as under
basic operation. For details concerning to Hi-sensible
applications, please contact your dealer.
 To activate this setting under cooling operation: change field
setting [2-8] to the appropriate value, matching the
requirements of the pre-designed system containing a high
sensible solution.
 To activate this setting under heating operation: change field
setting [2-9] to the appropriate value, matching the
requirements of the pre-designed system containing a high
sensible solution.
15.3.2. Several comfort settings are available
For each of above modes a comfort level can be selected. The
comfort level is related to the timing and the effort (energy
consumption) which is put in achieving a certain room temperature by
temporarily changing the refrigerant temperature to different values in
order to achieve requested conditions more quickly.
 Powerful
Overshoot (during heating operation) or undershoot (during
cooling operation) is allowed compared to the requested
refrigerant temperature, in order to achieve the required room
temperature very fast. The overshoot is allowed from the start up
moment.
In case of cooling operation the evaporating temperature is
allowed to go down to 3°C on temporary base depending on the
situation.
In case of heating operation the condense temperature is
allowed to go up to 49°C on temporary base depending on the
situation.
When the request from the indoor units becomes more
moderate, the system will eventually go to the steady state
condition which is defined by the operation method above.
 To activate the powerful comfort setting under cooling
operation, change field setting [2-81]=3.
This setting is used in conjunction with setting [2-8].
 To activate the powerful comfort setting under heating
operation, change field setting [2-82]=3.
This setting is used in conjunction with setting [2-9].
[2-82]= Heating comfort setting.
Default value=1
Change [2-82]=0, 1, 2 or 3 in function of required
limitation.
This setting is used in conjunction with setting [2-9].
For more information and advice about the impact of
these settings, see "15.3. Energy saving and optimum
operation" on page 40.
(a) It is necessary to use the optional external control adaptor for outdoor unit
(DTA104A61/62). See the instruction delivered with the adaptor for further details.
Value
[2-82]
Heating comfort setting
0Eco
1 Mild (default)
2Quick
3 Powerful
Value
[2-8]
T
e
target
37
48
59
610
711
Value
[2-9]
T
e
target
141
343