Carrier Idrofan 42NH, Инструкция по установке, эксплуатации и обслуживанию, Страница: 18 / 24

4.2 - Drain pan removal
WARNING: Disconnect the power supply to the unit
before carrying out any work on the unit.
■ Disconnect the flexible condensate drain pipe held
in place by a collar (the collar is not supplied by
Carrier).
■ Remove the metal sheet part under the pan by
loosing the two lateral screws and one additional front
screw (see fig. 1, 2 and 3)
■ Pull out the drain pan under the unit by sliding it from
its support plate. Remove drain pan from bottom of
unit.
■ During the pan removal and maintenance, lay the
end of the coil on the metal support plate to prevent
any damage to the casing (to remove the coil see
procedure in chapter 4.3.).
■ Replacement is by the reversal of the procedure
described above (check that the coil lays at the center
of the drain pan as initially)
■ Control clamping of the drain pipe and be sure there
is no water leakage.
4.3 - Water coil
4.3.1 - Coil removal procedure
WARNING: Disconnect the power supply to the unit
before carrying out any work on the unit.
■ Close the isolating valves on the manifolds.Empty
the water in the unit by opening the drain valve (see
Fig. 14)
■ Unscrew the union nuts to disconnect the flexible
water pipes.
■ Remove the valve actuators taking care to identify
the cooling and heating valves.
■ Disconnect the flexible condensate drain pipe held
in place by a collar (the collar is not supplied by
Carrier).
■ Remove the two-way or four-way water flow control
valve bodies. Depending on the unit configuration
the four-way valve coupling may be fitted with a
heating/cooling changeover switch. If so, do not
remove it.
■ Loosen the four fixing screws. Pull out the drain pan
and coil assembly (the drain pan remains attached
to the unit for approximately 100 mm) until the coil is
completely detached. Then remove the coil from the
drain pan.
■ Replacement is by the reversal of the procedure
described above. Ensure that all gaskets are changed
(new gaskets fitted) and that the inlet and outlet
connections to the coil are made correctly using an
appropriate sealing compound applied to the valve
body. Bleed all air from the coil during refilling.
NOTE : if necessary, the coil can also be removed
from under the unit along with the drain pan (see
chapter 4.2. “Drain pan removal”)
WARNING: Take care when tightening the valve
body to the coils (15 N·m is sufficient) to ensure
they are not damaged.
NOTE: The orientation of the coil cannot be
reversed.
4.3.2 - Coil inlet/outlet and cooling/heating
side positions
Water inlets/outlets, all sizes : Fig. 14.
WARNING: Carefully observe the direction indicated
by the arrow on the valves, based on the valve type.
4.4 - Duct connection spigots
These are manufactured from high density plastic with
a VO fire rating, more or less equivalent to class M1
(French standard). They are encased inside the unit.
The ducts should be fixed to these spigots using circular
collars or adhesive. Screws and rivets should not be
used.
WARNING: In order to guarantee good air tightness,
the duct should overlap the whole of the spigot.
Make sure that the maximum supply air temperature
does not exceed 60°C.
Do not lift or support the unit using the spigots, place
loads on the spigots during installation or operation.
4.5 - Duct connection rectangular
flanges
When connecting rectangular flanges to the inlet and
the outlet make sure that the duct is pushed closely the
unit.
4 - COMPONENTS AND MAINTENANCE
18