Electrical Connections - Carrier 38XTZ 007-024 Installation, Operation And Maintenance Instructions

3. Belt tension (see Fig. 39)
The minimum belt deflection is 10 mm when the force
shown in Fig. 39 is applied.
ATTENTION: Once the motor pulley opening or closing has
been set, check that the setscrews have been correctly
tightened.

ELECTRICAL CONNECTIONS

WARNING: To prevent electrical shock or equipment
damage, make sure disconnects are open before electrical
connections are made. If this action is not taken, personal
injury may occur.
NOTE: The power supply for the units has to be in
accordance with applicable standards and laws, the low
voltage directive, etc.
- Connect the power supply for the complete system
(outdoor unit and indoor unit) via the 38XTZ outdoor unit
(see Fig. 40).
- Consult the wiring diagram supplied with the unit, that
shows all power connections between the 38XTZ outdoor
unit and the 40ABZ/ALZ indoor unit and the general power
supply to the system.
- The connection cables between the units must not be
lighter than the flexible Neoprene-covered cable (type
H05 RN-F), with an appropriate wire section for the
supply to the 40ABZ unit.
- The power of the optional electric heater of the indoor unit
is supplied via the main disconnect switch of the 38XTZ
unit (see Fig. 42).
Fig. 40 - General unit power supply
Legend
Q1: Main unit power supply disconnect switch.
Located in the outer panel of the 38XTZ unit.
F1: Field-installed fuses.
28
Fan pulley
2 kg or 3 kg
Motor
pulley
Fig. 39
- Route all cables through the conduits in the 38XTZ units
to the terminals of the main disconnect switch (see unit
wiring diagram).
- Voltage to the unit must be within 2% of the voltage and
10% of the current indicated on the nameplate. Contact
your local power company for correction of an incorrect
line voltage.
- Take special care when making the earth connection. This
is the first cable to be connected, and it must be longer
than the live cables.
- Operation of the unit on improper line voltage constitutes
abuse and is not covered by the Carrier warranty.
IMPORTANT: To ensure the correct unit power supply it is
necessary first to determine the wire section. The unit
electrical data (see Table 2, Electrical Data) and the line
length (maximum admissible voltage loss 5%) must be taken
into consideration.
If the indoor unit includes an electric heater, this must be
taken into consideration when sizing the system power
supply cable (38XTZ-40ABZ/ALZ) and the isolator switch
and fuses.
- Never operate a unit if the voltage imbalance exceeds 2%.
The following formula must be used to determine the
percentage of voltage imbalance.
Voltage imbalance % =
Largest deviation from average voltage
Average voltage
Example: Nominal supply: 400-3-50
AB = 404 V
BC = 399 V
AC = 394 V
Average voltage = 404 + 399 + 394
Determine maximum deviation from average voltage:
AB = 404 - 400 = 4
BC = 400 - 399 = 1
AC = 400 - 394 = 6
Largest deviation is 6 volts. Percentage voltage imbalance is
therefore:
6 x 100 = 1.5 %
400
Fig. 41
= 399 = 400 V
3