Operating Limits - Carrier Atmosphera 42EM Series Manual

2.3 - Operating limits

• Cooling mode:
Supply air temperature 12°C, when the unit is installed in
an ambient temperature of 27°C dry bulb and 65% relative
humidity.
•
Heating mode:
The air discharge temperature must not exceed 60°C to
avoid damage of the discharge spigots.
To avoid the risk of stratification and the resulting discom-
fort, Carrier advises to keep the discharge temperature
below 35°C.
• Operating environment
The 42EM Atmosphera has been designed for internal
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 < 0,02 ppm
2
• H S < 0.02 ppm
2
• NO, NO < 1 ppm
2
• NH < 6 ppm
3
• N O < 0.25 ppm
2
Recommended coil water quality
At installation handover, and then periodically every year, it is
advised to analyse the water for bacteria (detection of ferro-
bacterias, H S producing and sulphate reducing bacteria) and
2
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 French degrees:
• Chloride [CL - ]
• Sulphate [SO 2- ]
4
• Nitrate [NO - ]
3
• Dissolved iron
• Dissolved oxygen
• Carbon dioxide [CO
• Resistivity
• pH
10 < TH < 15
< 10 mg/l
< 30 mg/l
= 0 mg/l
< 0.5 mg/l
4 < [O ] < 9 mg/l
2
] < 30 mg/l
2
2000<Resistivity
<5000 Ωcm
6.9 < pH < 8
7