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1 - PRECAUTIONS
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.
1.1 - Operating limits
1.1.1 - Cooling mode
Cooling mode - Operating Limits
Min. inlet Temperature >5°C ethylene /
Water circuit
propylene glycol rate < 40% Water side
pressure < 15,5 bar (1550 kPa)
Ambient
T < 27°C / 65% relative humidity or
temperature and
humidity weight < 14,7 g/kg dry air
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 ethylene /
Water circuit
propylene glycol rate < 40% Water side
pressure < 15,5 bar (1550 kPa)
Ambient
temperature and
T < 40°C
humidity
Supply air
T < 60°C with supply plenum and spigots
temperature
application
1.1.3 - Operating environment
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
< 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, 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
-
]
■ Sulphate [SO
]
2-
4
■ Nitrate [NO
]
-
3
■ Dissolved iron:
■ Dissolved oxygen:
■ Carbon dioxide [CO
2
■ Resistivity:
■ pH:
1.2 - Clearances required
Without rectangular flange inlet
With rectangular flange inlet
With plenum
NOTE : All informations about dimensions and
weights are available in the PSD documentation on
Carrier Webportal
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.
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 < 8
: Fig.1
: Fig.2
: Fig.2 and Fig. 3
11
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