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2.2 - operating limits
•
Cooling mode
Supply air temperature 1°C when the unit is installed
where the ambient temperature is 7°C dry bulb with
65% relative humidity.
•
Heating mode
Max. supply air temperature = 60°C.
If an electric heater is used, the minimum unit
operating flow rate is 16.6 l/s (60 m
•
Operating environment:
The 4GM 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
< 0.0 ppm
H
S
< 0.0 ppm
NO, NO
< 1 ppm
NH
< 6 ppm
3
N
O
< 0.5 ppm
•
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, H
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:
Chloride [CL
-
]
Sulphate [SO
-
]
4
Nitrate [NO
-
]
3
Dissolved iron:
Dissolved oxygen:
Carbon dioxide [CO
Resistivity:
pH:
6
3
/h).
S-producing and
1.0 < mmol/l < 1.5
< 10 mg/litre
< 30 mg/litre
= 0 mg/litre
< 0.5 mg/litre
4 < [O
] < 9 mg/litre
]
< 30 mg/litre
0 < Resistivity < 50 Ω ·m
6.9 < pH < 8
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