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1 - GUIDELINES
Only specially trained and qualified technicians and
installers who have been fully trained on the product
concerned are authorised to install, commission
and service this equipment.
These products cannot be accessed by the general
public.
In particular it is obligatory to disconnect all power
supplies to the unit and its accessories before
carrying out any work.
1.1 - Operating limits
1.1.1 - Cooling
Cooling mode - Operating Limits
Min. inlet Temperature >5°C
Water circuit
ethylene / propylene glycol rate < 40%
Water side pressure < 15,5 bar (1550 kPa)
Ambient
T < 27°C / 65% relative humidity or humidity
temperature
weight < 14,7 g/kg dry air
and humidity
Supply air
T > 12°C with maximum ambient humidity
temperature
conditions (14,7 g/kg dry air)
1.1.2 - Heating mode
Heating mode - Operating Limits
Max. inlet Temperature < 80°C
Water circuit
ethylene / propylene glycol rate < 40%
Water side pressure < 15,5 bar (1550 kPa)
Ambient
temperature
T < 40°C
and humidity
Supply air
T < 60°C
temperature
30
1.1.3 - Operating environment
The 42ET unit 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
< 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
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, 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, vents, isolation
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
]
-
• Sulphate [SO
]
2-
4
• Nitrate [NO
]
-
3
• Dissolved iron
• Dissolved oxygen
• Carbon dioxide [CO
2
• Resistivity
• pH
S-producing and
2
< 10 mg/litre
< 30 mg/litre
= 0 mg/litre
< 0.5 mg/litre
4 < [O
] < 9 mg/litre
2
]
< 30 mg/litre
20 Ohm·m < Resistivity
< 50 Ohm·m
6.9 < pH
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