Using The Leak Detection Function; About Automatic Leak Detection; To Manually Perform A Leak Detection; Commissioning - Daikin VRV IV+ RYYQ12U7Y1B Series Installer And User Manual

8 Commissioning

7.4

Using the leak detection function

7.4.1

About automatic leak detection

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:
▪ The additional refrigerant charge was inputted in the system's
logic (see [2‑14]).
▪ The system test run was executed (see
page 46), including the detailed refrigerant situation check.
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.
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.
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
≥50/40 m, the leak detection function can not be used.
7.4.2

To manually perform a leak detection

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.
1 Push BS2 one time.
2 Push BS2 one more time.
3 Push BS2 5 seconds.
4 Leak detection function will start. To abort leak detection
operation, push BS1.
Result: If manual leak detection was executed, the result of leak
detection is shown on the outdoor unit 7‑segment display. Indoor
units are in locked state (centralised control symbol). The result
corresponds with the list below. To get more detailed information:
check through mode 1 to know the exact amount. To return to
normal state, push BS1.
Display
Installer and user reference guide
46
"8 Commissioning" on
Leaked amount (kg)
0≤x<0.5
0.5≤x<1
1≤x<1.5
1.5≤x<2
Display
Information codes:
Code
Unit is not prepared to execute leak detection
operation (refer to requirements to be able to
execute leak detection operation).
Indoor unit is out of temperature range for leak
detection operation.
Outdoor unit is out of temperature range for
leak detection operation.
Too low pressure was noticed during leak
detection operation. Restart leak detection
operation.
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].
Steps during leak detection:
Display
Preparation
Pressure equalisation
Start up
Leak detection operation
(b)
Standby
Leak detection operation is finished
(a) If the indoor temperature is too low, first the heating
operation will start.
(b) If the indoor temperature is lower than 15°C due to leak
detection operation and the outdoor temperature is lower
than 20°C, the heating operation will start to maintain basic
comfort heating level.
8 Commissioning
8.1

Overview: Commissioning

After installation and once the field settings are defined, the installer
is obliged to verify correct operation. Therefore a test run MUST be
performed according to the procedures described below.
This chapter describes what you have to do and know to
commission the system after it is configured.
Leaked amount (kg)
2≤x<2.5
2.5≤x<3
3≤x<3.5
3.5≤x<4
4≤x<4.5
4.5≤x<5
5≤x<5.5
5.5≤x<6
6≤x<6.5
6.5≤x<7
7≤x<7.5
7.5≤x<8
8≤x<8.5
8.5≤x<9
9≤x<9.5
9.5≤x<10
10≤x
Description
Steps
(a)
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1 – 2018.09