1 - PRECAUTIONS
1.1 - Operating limits
1.1.1 - Cooling mode
Minimum supply air temperature 12°C when the unit is installed
where the ambient temperature is 27°C dry bulb with 65% relative
humidity.
1.1.2 - Heating mode
Max. supply air temperature = 60°C to avoid damage of the
discharge spigots. To avoid all risks of stratification, Carrier
recommends to keep the supply air temperature below 35°C.
1.1.3 - Operating environment
The 42BJ ICM LEC has been designed for indoor application in
‘urban’ conditions having a non-corrosive, dust-free and non-
marine environment.
The concentrations of the following chemicals must not be
exceeded in any event:
-
SO
2
< 0,02 ppm
-
H2S
< 0,02 ppm
-
NO, NO
2
< 1 ppm
-
NH
3
< 6 ppm
-
N
2
O
< 0,25 ppm
Do not install a unit where flammable gases or products of an
acidic or alkaline character may be present. The copper/aluminium
coil or components inside the unit could suffer irreparable corrosion
damage in their presence.
1.1.4 - Recommended coil water quality
At installation handover, and then periodically every year, it is
advised to analyse the water for bacteria (detection of ferro-
bacteria, H2S-producing and sulphate-reducing bacteria) and
chemicals (in order to avoid problems due to corrosion and
scaling).
The water circuit must include all the necessary elements for the
treatment of the water: filters, additives, intermediate exchangers,
purges, drains, isolating valves, etc., according to the analysis
results.
The results must be in accordance with the values shown below:
-
Total hardness in mmol/l: 1 < mmol/l
< 1,5
-
Chloride [CL
-
]
< 10 mg/litre
-
Sulphate [SO
4
2-
]
< 30 mg/litre
-
Nitrate [NO
3
-
]
= 0 mg/litre
-
Dissolved iron:
< 0,5 mg/litre
-
Dissolved oxygen:
4 < [O
2
] < 9 mg/litre
-
Carbon dioxide [CO
2
]
< 30 mg/litre
-
Resistivity:
20 Ohm·m < Resistivity < 50 Ohm·m
-
pH:
6,9 < pH < 8
1.2 - Clearances required
Please refer to Fig. 1.
1.3 - Receiving a shipment - installation
methods
When receiving a shipment, check the condition of the goods and
report any damage in transit to the shipping company. Do not
unpack the units until just before they are due to be installed, and
make sure they are as close as possible to the installation site
when unpacking them. Do not place heavy articles of any sort on
them.
1.4 - Supply voltage 230V ± 10% - 50 Hz
Check that the supply voltage and frequency correspond to the
values of the unit to be installed.
WARNING: Failure to take proper account of the above advice
and unauthorised modification of the electrical connections
will render the Carrier warranty on the product null and void.
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