0
Legend
F8
Thermomagnetic indoor fan switch (included in the control box).
K3
Indoor fan motor contactor (included in the control box).
F4
Indoor fan motor thermal protection (included in the control box).
F1
General fuses of the installation (field-supplied).
Q1
Unit main disconnect switch (included in the 38UQZ panel).
F19
Thermomagnetic switch of the optional electric heater.
K6
Optional electric heater contactor.
R1, R2 Optional crankcase heater.
F6
Thermomagnetic switch of the optional crankcase heater.
M
40ALZ indoor fan motor.
1
Connection cables between the 40ALZ indoor unit fan motor and the
38UQZ control box.
2
Cables from the 40ALZ unit of the outdoor unit for the power supply of the
heating coil.
NOTE:
The cables shown by the broken lines are not factory-supplied.
•
If the units include options or accessories, such as
heating coils for electric heaters or the compressor
crankcase heater, proceed as follows:
Heating coils for electric heater - connect in accordance
with the wiring diagram downstream of the 38UQZ
main disconnect switch. Do not exceed the power in
kW recommended by Carrier. Use correctly sized main
fuses and the new unit power supply cable section. If
the power input of the electric heater plus the power
input of the indoor and outdoor fan plus the power
input of the compressor is higher than the total power
input given in Table - Electrical Data, new fuses and
power supply cable sections must be used.
•
thermostat connection
Thermostat/unit connection must be via a loom manu-
factured in accordance with the wiring diagram accom-
panying the unit and the thermostat installation
instruction.
NOTE:
Refer to the applicable thermostat installation manuals for each model.
REFRIgERANT LINE CONNECTIONS
Connection between units
The 38UQZ outdoor units must be connected with the
40ALZ indoor units with refrigerant-grade copper pipes
for correct operation.
For each compressor in the 38UQZ outdoor unit a pipe for
refrigerant gas and another pipe for liquid refrigerant must
be installed.
For copper-pipe refrigerant connection lines the following
points must be observed:
•
Ensure that the line length is as short as possible.
•
The number of bends or elbows must be the minimum
possible.
•
Design the lines with the correct diameter for the
required compressor oil suction velocity.
•
Route the lines so that they do not obstruct the normal
building use. Avoid exposing them to extreme high or
low temperatures.
•
Install them where they cannot be damaged.
•
If they are routed outside the building, protect them
against extreme temperatures and damaging environ-
mental influences.
•
Insulate the suction/discharge line along its complete
length, and the liquid line if this is indicated.
IMPORTANT: Always use refrigerant-grade deoxidized
and dehydrated copper tubing between the indoor and
outdoor units.
•
Carefully protect the copper pipes during transport,
installation and connection, against possible ingression
of water or moisture.
•
Also prevent entry of any contaminants or foreign
substances.
•
Four operations are very important:
- Pipe cleaning
- Pipe leak tightness
- Correct leak tests
- Correct evacuation
•
When pipes are soldered, cut or flared, etc. ensure that
no residue or shavings can enter the pipes. Blow any
residue away from the pipe ends and check them
carefully.
Fig. 24
Crankcase heater
