Carrier 36XB, Installation, Operation And Maintenance Instructions

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10
English
4.2 - Water coil
4.2.1 - Removal procedure for the water coil
CAUTION: Before any work, it is essential that the
power supply to the device is disconnected.
• Close the isolation valves on the manifolds.
• Drain the isolated unit using the purge device
provided.
• Disconnect the hydraulic hoses by unscrewing the
union nuts.
• Remove the actuators, taking care to mark the cold
valve and hot valve.
• Disconnect the condensate drain hose held in place by
a collar (not supplied by Carrier).
• Remove the water flow control valve bodies.
Depending on the configuration of the 36XB, the
valve coupling may be fitted with a hot/cold
changeover switch which must not be removed.
• Open the grille: Fig. 10-11.
• Remove the safety device: Fig 6.
• Remove the bracket for the condensate pan, then the
pan itself:
Fig. 14.
• Remove the four retaining screws for the water coil:
Fig. 15.
• After work on the pan/coil assembly is complete, refit
the assembly in the reverse order to removal, ensuring
that all the gaskets are replaced (new gaskets fitted)
and that the coil inlet/outlet connections have been
made water-tight using a suitable sealing compound.
• Purge all air from the coil during refilling.
ATTENTION: It is recommended that the valve bodies
are tightened on the coils with great care (25 N
·
m is
sufficient) to ensure no damage is caused.
4.2.2 - Water inlet/outlet positions
Water inlets/outlets, all sizes: Fig. 17
Left-hand connections: Fig 17a
Right-hand connections: Fig 17b.
ATTENTION: Ensure the flow direction indicated by an
arrow on the valves is observed, based on the connection
and type of valve.
4.3 - Condensate pan
4.3.1 - Removal procedure for the condensate pan:
CAUTION: Before any work, it is essential that the
power supply to the device is disconnected.
• Open the grille: Fig. 10-11
• Remove the safety device: Fig 6
• Remove the condensate drain piping
• Remove the bracket for the condensate pan, then the
pan itself:
Fig. 14.
• Once work on the assembly is complete, refit the
assembly in the reverse order to removal.
Note: To clean the condensate pan, refer to the relevant
local legislation.
4.4 - Fresh air connection spigot
This is fitted in place from inside the unit. The duct must
be attached to the spigot using a clamp or adhesive; it must
not be screwed in or riveted.
ATTENTION: When the fresh air duct is fitted, make sure
the spigot is fully inserted to ensure the best possible seal.
Ensure that the maximum supply air temperature does not
exceed 60°C.
Ensure that the device is not lifted using the spigot. Do not
place any loads on this component, and take care not to
damage it using tools or during installation.
4.5 - Air filter option and access
4.5.1 - Description
The Carrier Hybrid Air Terminal can be equipped with a
disposable filter as per standard EN 779.
Fire classification for the medium is M1, metal wire frame.
The filter must be released when the grille is opened:
• Open the grille: Fig. 10-11
• Remove the safety device: Fig 6
• Remove the filters and replace them: Fig. 16
• Once work is complete, refit the assembly in the
reverse order to removal.
4.5.2 - Air filter replacement
The filter must be replaced regularly. The service life of a
filter depends on the level of clogging, which varies
according to its conditions of use.
If a clogged filter is not replaced, the pressure drop
increases and it may start to release its stored dust,
adversely affecting the performance of the unit (reduction
of the air flow rate).
4.6 - Fresh air flow controller option
The 36XB Hybrid Air terminal can be equipped (as an
option) with a fresh air flow controller with a variable flow
rate from 0 to 41.6 l/s (0 to 150 m
3
/h).
This is connected to the Carrier digital controller and can
adjust the fresh air intake flow rate in two ways
• Either to a fixed flow rate set by the installer, which
can be reconfigured as required
• Or based on the CO
2
rate; in this case, it is connected
to a CO
2
sensor via the Carrier digital controller (the
CO
2
sensor is located on the air return).
NOTE: For a fresh air flow controller with a variable
flow rate, the upstream pressure in the fresh air duct must
be at least 180 Pa.