Master Link I Electronic Control - Carrier 38XTZ 007-024 Installation, Operation And Maintenance Instructions

- The cables marked 1 from the 40ABZ/ALZ indoor units
are run to the 38XTZ outdoor unit control box for
connection to the fan motor, and in the case of the optional
electric heater also cables marked 2.
Optional
electric heater
Legend
F3: Thermomagnetic indoor fan switch (included in the control box).
K2: 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 38XTZ panel).
F18:Thermomagnetic switch of the optional electric heater.
K6: Optional electric heater contactor.
R3: Optional crankcase heater.
F6: Thermomagnetic switch of the optional crankcase heater.
M: 40ABZ/ALZ indoor fan motor.
: Connection cables between the 40ABZ/ALZ indoor unit fan motor and the
38XTZ control box.
: Cables from the 40ABZ/ALZ 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:
a) Compressor crankcase heater (230 V/1 ph) - this must
be permanently connected, and the power supply
must be separate from the rest of the unit power. It
must be protected by a fuse.
b) Heating coils for electric heater - connect in
accordance with the wiring diagram downstream of
the 38XTZ 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 electric heater power input
plus the power input of the indoor fan is higher than
the total power input given in Table 2, Electrical Data.
40ABZ/ALZ
fan motor
Fig. 42
- Thermostat connection
Thermostat/unit connection must be via a loom
manufactured in accordance with the wiring diagram
accompanying the unit and the thermostat installation
instruction. Remember that for:
- Models 38XTZ 007 and 008 with 40ABZ 007 and
008 the thermostat is 220 V/1 ph/50 Hz (*).
- Models 38XTZ 011 and 014 with 40ALZ 011 y 014
the thermostat is 24 V with connection to the
programmable or non-programmable versions (*).
- Models 38XTZ 016 to 024 with 40ABZ 016 to 024,
units with Master Link I, the thermostat is 24 V with
connection to the programmable or non-
programmable versions (*).
(*) NOTE: Refer to the applicable thermostat installation manuals for each model.

MASTER LINK I ELECTRONIC CONTROL

(38XTZ 016-024)
General description
An electronic control system which operates these units is
incorporated in the electrical box. This simplifies and improves
service operations and improves the performance.
This new Master Link I electronic control system allows
communication with specific servicing tools, basic or advanced
(PC).
In addition, the information stored in the unit can be used as a
history record, facilitating service operations.
The system is composed of the following elements:
- Basic or main board
- Extension board
- Temperature probe
- Safety transformer
The main board, or basic unit, is factory-configured for each
model. Nevertheless, please find below the components which
the installer or maintenance technician (never the user) can
initialize, together with an illustration of the board.
Red LED
Green LED
Main electronic board - Master Link I
DIP-switches
Fig. 43
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