Leak Detection Function - Daikin RYYQ8T7Y1B Installation And Operation Manual

[2-86]= Automatic leak detection activation
When you want to use the automatic leak detection
function you have to activate this setting. By activating
setting [2-86], the automatic leak detection will be
executed depending on the defined value setting. The
timing for the next automatic refrigerant leak detection is
subject to setting [2-85]. The automatic leak detection
will be executed in [2-85] days.
Each time when the automatic leak detection function
was executed the system will stay idle until it is restarted
by manual thermo ON request or by next scheduled
action.
Default value=0.
Value
[2-86]
0
1
2
[2-88]= Gathering detailed refrigerant information during test
run. For more details, see
optimum operation" on page
Value
[2-88]
0
1
(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.

15.3. Leak detection function

The (automatic) leak detection function is not by default activated.
The (automatic) leak detection function can only start working when
both below conditions are fulfilled:
1 The additional refrigerant charge was inputted in the system's
logic (see "[2-14]=" on page
2 The system test run was executed (see
page 44), including the detailed refrigerant situation check.
When above conditions are fulfilled, the leak detection function can
be used.
The leak detection operation can be automated. By changing
parameter [2-85] to chosen value, the interval time or the time till the
next automatic leak detection operation can be chosen. The
parameter [2-86] defines whether the leak detection operation is
executed one time (within [2-85] days) or intermittent, respecting an
interval of [2-85] days. For details, see
Availability of the leak detection function feature requires input of the
additional refrigerant charge amount immediately after finishing the
charging. The input must be executed before performing the test
operation.
NOTICE
If a wrong value is input for the additional charged
refrigerant weight, the accuracy of the leak detection
function will decrease.
RYYQ+RYMQ+RXYQ8~20T7Y1B
VRV IV System Air Conditioner
4P329765-1 – 2012.09
Content
No leak detection planned (default)
Leak detection planned once in
[2-85] days.
Leak detection planned every [2-85]
days.
"15.4. Energy saving and
42.
Content
Active (default)
Not active
40).
"15.5. Test operation" on
page 41.
INFORMATION
 The weighed and already recorded amount of
additional refrigerant charge (not the total amount of
refrigerant present in the system) must be entered.
The leak detection function is not available when

Hydrobox units or RA DX indoor units are connected
to the system.
When the height difference between indoor units is

≥50 m, the leak detection function can not be used.
When the leak detection functionality was initially not required but
activation is wanted on a later moment, it is required to fulfil below
conditions:
The additional refrigerant charge needs to be inputted in the

system's logic.
The system test run has to be re-executed.

Executing the leak detection function one time at site can also be
done by following procedure.
Push BS2 one time. Push BS2 one more time. Push BS2 5 seconds.
Leak detection function will start. To abort leak detection operation,
push BS1.
Information codes:
E-1: unit is not prepared to execute leak detection operation

(refer to requirements to be able to execute leak detection
operation).
E-2: indoor unit is out of temperature range for leak detection

operation.
E-3: outdoor unit is out of temperature range for leak detection

operation.
E-4: too low pressure was noticed during leak detection

operation. Restart leak detection operation.
E-5: indicates an indoor unit which is not compatible with leak

detection functionality is installed (e.g., RA DX indoor unit,
Hydrobox, ...).
Result of leak detection operation is informed in [1-35] and [1-29].
15.4. Energy saving and optimum operation
This VRV IV 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.
15.4.1. 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.
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.
As such adjusting the
Installation and operation manual
refrigerant
42