12
the drain pipe becoming clogged by dust, dirt or some other
material should be foreseen.
Attaching unit
From the roof
The unit will be fastened to the roof by four M-10 bolts as
shown in figure. For this type of installation the use of
vibration isolators is recommended.
When fastening unit care should be taken that it is completely
horizontal or slightly tilted towards the drain to avoid the
dripping of condensed water (use an air bubble level).
The connections to the unit should be done with copper tube
of 22 mm O.D.
Resting on the ground
If unit is placed outdoors on the ground, it should be raised on
supports to avoid the possibility that snow accumulation
blocks the air intakes.
Drain connections
The pan drain lines of the indoor and outdoor units must be
installed with a water trap with a minimum level difference of
75 mm between the connection to the unit and the line after
the water trap (see figure). This is necessary to avoid the fan
generated negative pressure preventing the drain pan from
draining.
The drain line should have a minimum slope of 20 cm per
meter length.
Attention:
When the heat pump operates under outdoor temperatures
below 5°C, the drain tube could become obstructed by ice
formation.
If the unit is located outdoors, the possibility of this happening
should be prevented by installing an electric heater on the
drain connection and wiring it according to the corresponding
diagrams.
Clearances
Free space must be allowed for in the installation of each unit
for:
a) Air intake and discharge from the outdoor unit.
b) Connecting the drainage and wiring pipes.
c) Air ducts.
d) Maintenance servicing.
e) Connecting up of the electrical supply.
The minimum distances, indicated in the overall dimensions
diagrams, must always be respected with regard to possible
obstacles to the free circulation of air, or the operator's work.
Air ducts
1) Air ducts should be connected to the unit isolated by a
sleeve of a flexible, preferably non-combustible material,
to prevent transmission of the unit's own vibration. If
ducts are made from a flexible material they will not
transmit vibration.
2) It is advisable to install a damper in every discharge duct,
thus making possible a correct balance of the system.
3) Allow for an easy access to the air filters for replacement
and cleaning.
4) If the air discharge of the outdoor coil is done through
ducts, it is advisable that the first meter section be of
galvanized sheet to avoid corrosion produced by water
droplets carried by the air.
It is very important to take the maximum cara with the support of the
internal unit when hanging it from a false ceiling. Make sure that the
false ceiling is strong enough to withstand the weight of the unit. Before
hanging the unit, check the strength of every suspension bolt installed.
Attention: It is essential to use all fixing points on the unit.
The BCH-7, 10, 12, 15 and 20 have 4 fixing points.
The BCH-25 and 30 have 6 fixing points.
CAUTION
2% SLOPE
75 mm
MINIMUM
PLUG
