Carrier 42EP, Installation, Operation And Maintenance Instructions

Page: 12 / 76

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
a c c e s s o r i e s b e f o r e
carrying out any work.
1.1 - Operating limits
1.1.1 - Cooling mode
Cooling mode - Operating Limits
Water circuit
Min. inlet Temperature >5°C
ethylene / propylene glycol rate < 40%
Water side pressure < 15,5 bar (1550 kPa)
Ambient
temperature
and humidity
T < 27°C / 65% relative humidity or
humidity weight < 14,7 g/kg dry air
Supply air
temperature
T > 12°C with maximum ambient humidity
conditions (14,7 g/kg dry air)
1.1.2 - Heating mode
Heating mode - Operating Limits
Water circuit
Max. inlet Temperature < 80°C
ethylene / propylene glycol rate < 40%
Water side pressure < 15,5 bar (1550 kPa)
Ambient
temperature
and humidity
T < 40°C
Supply air
temperature
T < 60°C with supply plenum and spigots
application
1.1.3 - Operating environment
The 42EP 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 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
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: 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 - ] <10 mg/litre
- Sulphate [SO
4
2- ] <30 mg/litre
- Nitrate [NO
3
- ] =0 mg/litre
- Dissolved iron [Fe]: Fe <0,5 mg/litre
- Dissolved oxygen [O
2
]: 4< [O
2
] < 9 mg/litre
- Carbon dioxide [CO
2
] CO
2
<30 mg/litre
- Resistivity [R]: 20< R< 50 Ohm·m
- pH: 6,9 < pH < 8
1.2 - Clearances required
Base unit: Fig.1
With rectangular flange: Fig.2
With compact plenum: Fig. 3
With large plenum: Fig. 4
NOTE : All information's about dimensions and
weights are available in the PSD documentation on
Carrier Web portal
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.
12