Carrier 36XB, Installation, Operation And Maintenance Instructions

Page: 7 / 12

7
English
1 - PRECAUTIONS
1.1 - Operating limits
1.1.1 - Cooling mode
The minimum recommended primary air supply
temperature is 12°C when the unit is installed in a room
with temperature 27°C (dry bulb) and 65% RH (relative
humidity).
1.1.2 - Heating mode
Carrier recommends that the supply air temperature is
kept below 35°C in order to avoid the risk of stratification.
1.1.3 - Operating environment
The hybrid 36XB Air Terminal has been designed to operate
in an ‘urban’ indoor atmosphere, which is a non-corrosive,
dust-free and non-marine environment. The chemical
concentrations given below must not be exceeded in any
circumstances:
• 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 the unit in atmospheres which contain
flammable gases, or acid or alkaline products. The copper/
aluminium air coil and the internal components could suffer
irreparable corrosion.
1.1.4 - Recommended water quality for water coils
Once installation is complete, then each year, it is
recommend that the water is analysed for bacteria
(detection of ferro-bacteria, H2S-producing and sulphate-
reducing bacteria) and chemicals (in order to avoid
problems due to corrosion and scaling).
The water circuit must include the elements required for
water treatment: filters, additives, intermediate exchangers,
purges, vents, isolation valve, etc., based on the results of the
analysis.
The results of the analysis must correspond to the values
given 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
1.2 - Maintenance requirements
The installer must leave sufficient space around the unit to
facilitate maintenance: Fig 1. The installer must also provide
access to the control components, power connection and
fresh air duct: Fig. 1.
Some components are accessed by opening the air diffusion
grille.
During any intervention, it is essential that the safety system
is put back in place: Fig. 6.
1.2.1 – Procedure for opening the grille.
The grille is held in place at two points, at each end of the
diffuser in the supply air zone: Fig 2
• Insert the special Carrier tool (ref: 36XB500085M-) in
the third slot on the supply air side: Fig 10
• Pull downwards until the grille opens on the left-hand
side and then carry out the same operation on the
right-hand side: Fig 11
• Remove the safety device.
To close the grille, the safety device must be put back in
place and the grille pushed fully back in.
Note: The grille must only be opened with the Carrier tool
specially provided: Fig.10 and 11.
If this instruction is not observed, Carrier cannot be held
liable for any damage to the unit or to its appearance or
injury to persons caused by incorrect handling.
1.3 - Delivery
Once received, check the condition of the equipment;
if any damage caused during transport is observed, the
resulting claims must be sent to the shipping company
in writing. Only unpack when final installation is to take
place, and do so as close as possible to the installation
location. Do not place heavy tools on the package whilst
waiting.
1.4 - Storage
The units will be delivered on a pallet, and must be stored
in a sheltered, dry location.
1.5 - Supply voltage 230 V ± 10% - 50 Hz
Check that the supply voltage and frequency match those
on the unit nameplate.
CAUTION: Carrier will invalidate the warranty if these
points are not respected, or if modifications have been
made to the original electrical connections.
2 - SAFETY CONSIDERATIONS
NOTE: before performing any work on the unit, disconnect
the power to the unit and to any accessories.
2.1 - General
Installing, commissioning and servicing of the various
system components (unit, control system, hot and cold
water system, air distribution system) can be dangerous
unless certain aspects of the installation, such as the
presence of mains electricity or the presence of hot or cold
water in the air treatment equipment, are taken into
account. Only appropriately trained and qualified
technicians and installers are authorised to install and
commission this equipment.
During servicing work, it is essential to apply all
recommendations and instructions given in the
maintenance manuals, on labels or in the instructions
delivered with the equipment, and to comply with any
other relevant instructions.