On-Board Safety On R32 Gas Unit - Lennox e-Baltic D BOX 55 Installation, Operating And Maintenance

FLAMMABLE GASES

ON-BOARD SAFETY ON R32 GAS UNIT:

A2L Rooftop units are supplied with leak detectors. They are connected to a NO/NC contact, provided to the customer, which
closes in case of a major leak.
FIRE AND SMOKE SAFETY HAVE PRIORITY OVER LEAK DETECTION.
The R32 detector is composed of a gas sensor on ventilation side and a control board. The control board is only intended for
indoor application. Do not change the position of the sensor elements.
The sensitive layer of the sensors reacts chemically in the presence of R32, changing its conductivity. The different oxidation
processes modify the conductivity and therefore the measurement, which is why regular calibrations are necessary. Regular
maintenance must be carried out in accordance with the instructions. Do not generate electrostatic discharges.
The following are currently known to poison the sensor and change its sensitivity:
•
Polymerizing substances such as ethylene oxide, acrylonitrile, butadiene, styrene, silicone.
•
Catalytic poisons, such as Sulphur and phosphorus compounds, silicon compounds, metallic vapors.
•
Organic solvents
Permissible temperature
Allowable humidity
Permissible pressure
Storage temperature
Storage
Calibration interval
Gas type MSR group
R32 FR08
WARNING :
Connecting the 24 V fieldbus voltage to terminal X7 of the local bus can destroy the board.
COMMISSIONING
Commissioning must only be carried out by people authorized by Lennox.
A documented functional test must be carried out during commissioning (without
the presence of gas).
SENSOR CARTRIDGE REPLACEMENT
•
Unplug the sensitive element.
•
Loosen the lock nut.
•
Remove the obsolete sensitive element.
•
Take the calibrated sensitive element out of its original packaging, check
the type of gas, the measuring range and the valid calibration date.
•
Insert the sensitive element and tighten with the lock nut.
•
Connect the plug of the sensitive element.
•
Follow the local standard concerning electronic equipment waste.
INSPECTION
Gas sensors must be checked regularly by a competent person. The following
must be checked :
•
Maintenance/calibration interval not exceeded.
•
Visual inspection of the sensor, wiring, etc.
•
Remove dust deposits, especially at the gas inlet.
•
The filter at the gas inlet must be replaced if it is dirty.
e-BALTIC-IOM-2020.12-EN
-35°C to +60°C
5 to 95% relative humidity without condensation
0.9 to 1.1 bar
0°C to +60°C
Up to 12 months
12 months
MSR Calibration
gas
2080-02 R407c
Group Measuring
range
CFC 20-2000 ppm
Relative
density
1.8 bar
16