5
ATTENTION: To avoid electrical shock, injury or
equipment damage, be sure that the ON-OFF power
switch is in OFF position. Field wiring must comply
with all local regulations and codes. Special attention
has to be made when making earth connections.
Supply voltage and the current has to be within 10%
of values indicated on the unit nameplate. If supply is
incorrect contact local power company.
Never operate a unit if the voltage unbalance exceeds
3%. The following formula must be used to determine
the percentage of voltage unbalance:
voltage unbalance % = largest deviation from
average voltage / average voltage.
EXAMPLE:
Nominal supply: 400.3.50
Measured voltage:
XY = 407V, YZ = 396V, ZX = 391V
Average voltage: (407+396+391)/3 =
398 V
Determine maximum deviation from average
voltage:
XY: 407-398 = 9V (= maximum deviation)
YZ: 398-396 = 2V
ZX: 398-391 = 7V
Percentage voltage unbalance: (9/398)x100 =
2.26%, <3%, therefore acceptable unbalance.
THERMOSTAT CONNECTION: Connection be-
tween the thermostat and the unit should be made
using flexible tube and to be in accordance with the
unit wiring diagram.
ATTENTION: If the unit operates at another voltage
from the specified it will loose the warranty.
ATTENTION: Compressors are mounted on
antivibration isolators. Do not remove fixing screws.
3. Provide a trap properly sized for correct water evacu-
ation (see Fig. 1).
4. Drain piping should be located below the drain con-
nection and should have inclination to assure proper
water flow.
AIR DUCTS
Ducts should be sized taking in consideration nominal
air flow and external static pressure of the unit.
1. Regardless of the type of the air ducts used they
cannot be flammable and cannot produce toxic gases
in the case of fire. They should have smooth inside
surface and not contaminate the air passing through
them. It is advisable to use sheet metal ducts with ther-
mal insulation to avoid condensation on the ducts and
excessive loss of energy.
2. Connect air ducts to the unit using flexible connec-
tions so as to absorb vibrations, avoid noise transmis-
sion and make easy unit access.
3. If possible avoid installing duct elbows close to the
air outlet of the unit. If it is necessary use large radius
elbows and inside air deflectors if duct size is large
enough.
NOTE: All duct design has to be made by technicians
experienced in this matter.
ELECTRICAL
CONNECTIONS
IMPORTANT: In order to be sure that unit power sup-
ply is correct (wire entry, wires cross section, protec-
tion devices, etc..) consult electrical data table, the wir-
ing diagram attached to the unit and check local stand-
ards concerning the installation of air conditioning
equipment.
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