Operating instructions
34
Option 159: Independent refrigerant leak detection system.
3.8.1 - Description
The European directive concerning fluorinated greenhouse
gases (F-gas regulation) now requires that installations with
300 kg or more F-gas must be leak-tested at least every
three months. This applies to 95% of 19XR/19XV units.
To facilitate these periodic maintenance visits, it is recom-
mended to install an independent optional refrigerant leak
detection system on these chillers. This system can either
be factory-installed or added to a machine that is already
installed.
It consists of an electronic module located in the control
box (see Fig. 26), that is conncted to a sensor located between
the two heat exchangers at the middle point of the unit
(see Fig. 27). This sensor is encased and attached to a fixing
bracket mounted between the oil balancing line and its
fixing support (see Fig. 28).
This system permits permanent monitoring of the leak-
tightness of the points where refrigerant leaks can occur in
the chiller refrigerant circuit. An analogue 4-20 mA signal
from the detection module at input J5-5(-)/J5-6(+) of the
CCM board is available for this purpose.
3.8.2 - Control/operation
The detection threshold corresponds to an assigned 6 mA
current, that is equivalent to a detection of 133 ppm R-134a.
The refrigerant leak alarm is configurable in the options
table on the ICVC. The access is via MENU/SERVICE/
EQUIPMENT SERVICE/SELECT/OPTIONS. The default
value is 20 mA, regulated at 6 mA.
If the sensor detects refrigerant in the air, the refrigerant leak
detection alarm (No. 250) is relayed and displayed on the
ICVC. The system is independent and directly linked to
the chiller operation. The alarm will cause the unit to shut
down. The 4-20 mA input signal can be adjusted by placing
DIP switch 1 of SW2 on the CCM board into the ON
position (see Fig. 29).
3.8.3 - Adding the module to an installed chiller
Carrier offers a referigerant leak detection kit (part number
19XR-509---632--EE-) that can be installed to existing
chillers. This is available from the Spare Parts Department.
The module can be added to any 19XR/19XV machine
with a control interface box or a starter control box. The
installation and wiring instructions are supplied with the kit.
The kit consists of the following parts:
Refrigerant leak detection module with sensor and 5 m cable
(19ZX-561---212--EE-)
1
3 x 0.5 LiYY cable 5
Three-point KK connector 1
KK contact 3
Screw T h M4 lg 12 3
Screw T h M4 lg 20 1
Rectier jumper (50 V, 8 A) 1
Red wire 0.93 (-5 V) 1,5
Brown wire 0.93 (+5 V) 1,5
Red wire 0.93 (0 V) 1,5
Brown wire 0.93 (24 V) 1,5
Pre-insulated red clip (6.35) 4
Machine connection piece (7 mm long) 4
DIN rail clips 2
Detector support panel 1
Sensor support panel 1
Installation and wiring instructions 1
Electronic leak detector module