34
NOTE: All duct sizing and design work should be carried out
by qualified technicians.
Condensate and rainwater drainage
The units are supplied with a condensate drain pan with a drain
pipe (outside diameter 23 mm). This tube leaves the factory
separately wrapped so it is easy to check them.
-
Take great care with the drain pipes; these must always be
below the connection and be inclined to facilitate drainage
(Fig. 34).
ATTENTION: Do not make any holes in the unit base, as this
may perforate the condensate pan.
Fig. 34 - Drain
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
= 399 400 V
3
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
CAUTION: The installer must provide line protection devices,
as required by the applicable legislation.
Run the power supply cables to the main disconnect switch of
the 50TZ/YZ or 38FZ/BZ unit, and install airtight cable
conduits through the knockouts provided for this purpose.
Electrical connection between the units (38FZ/BZ and
40TZ/BZ)
Make the electrical connection between the 38FZ/BZ outdoor
unit and the 40TZ/BZ indoor unit, using correctly sized copper
cables for the power supply of the 40TZ/BZ. Refer to the
wiring diagram.
Thermostat connection
Thermostat/unit connection must be via a loom (wire section
1 mm
2
) manufactured in accordance with the wiring diagram
accompanying the unit. Follow the instructions supplied with
the control for thermostat assembly and handling. The general
rules below should be taken into account:
Power supply:
24 V AC
Standard connections:
R
Connection to 24 V
L
Protection device indication
C
Common
Y1
First stage cooling
W1
First stage heating
W2
Second stage heating (option)
E
Emergency heat (option)
O
Reversing valve*
* The O connection is activated in cooling.
Motor
Drain pipe OD 23 mm
Drain pan
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.
Field wiring must comply with all applicable codes.
Voltage to the unit must be within 10% of the voltage and 10%
of the current indicated on the nameplate. Contact your local
power company for correction of an incorrect line voltage.
Check the voltage before selecting supply wiring fuses and
controls.
Take special care when making the earth connection.
WARNING: 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 (cable
entry, conductor cross section, protection devices etc.), consult
the electrical data table, the wiring diagram supplied with the
unit and the applicable standards concerning the installation of
air conditioning equipment.
The protective earth conductor must be slightly longer than the
phases.
Never operate a unit if the voltage imbalance exceeds 10%.
The following formula must be used to determine the
percentage of voltage imbalance.
Unit base
Field-supplied
