Only specially trained and
qualified technicians and
installers who have been fully
trained on the product
concerned are authorized to
install, to commission and
service this equipment.
In particular it is obligatory to
disconnect all power supplies
to the unit and its accessories
before carrying out any work.
Water circuit Min. inlet Temperature >5°C
ethylene / propylene glycol rate < 40%
Water side pressure < 15,5 bar (1550 kPa)
T < 27°C / 65% relative humidity or humidity
weight < 14,7 g/kg dry air
T > 12°C with maximum ambient humidity
conditions (14,7 g/kg dry air)
Water circuit Max. inlet Temperature < 80°C
ethylene / propylene glycol rate < 40%
Water side pressure < 15,5 bar (1550 kPa)
T < 40°C
T < 60°C with supply plenum and spigots
application
The 42NH / 42NL 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
• H
2
S < 0.02 ppm
• NO, NO
2
< 1 ppm
• NH
3
< 6 ppm
• N
2
O < 0.25 ppm
Do not install a unit where ammable 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.
At installation handover, and then periodically every year,
it is advised to analyse the water for bacteria (detection of
ferro-bacteria, H
2
S-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: lters, 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
Without rectangular ange inlet : Fig.1
With rectangular ange inlet : Fig.2
With plenum : Fig.2 and Fig. 3
NOTE : All informations about dimensions and weights
are available in the PSD documentation on Carrier
Webportal
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.
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