31
LEDs
There are two LEDs (red and green) on the electronic board
which indicate its status (see Fig. 43).
Intermittent green LED: The board status is correct.
Green LED off: The following steps should be taken:
1. Check whether there is 24 V AC running through the B1
connections on the board (see Fig. 43).
2. If there is, replace the board with a new one.
3. If there is none, look for the fault in the unit electrical
system and repair it.
4. Recheck the B1 connections.
Green LED on: Replace the board.
Red LED off: The status is correct.
Red LED on: Three possibilities:
1. Defective connection between the main board and the
secondary board. Check CO1 (Figs. 43 and 44)
connection. Check the status of the connecting cable.
2. Remote control incorrectly connected.
3. The secondary board jumpers J1 and J2 (Fig. 44) are
incorrectly connected. In order to correct this, use the table
below.
Table 9 - Secondary board jumpers
A: Cooling only models with 1 compressor + electric heater
in indoor unit.
B: Cooling only models with 2 compressors + electric heater
in indoor unit.
C: Heat pump models with 1 compressor + electric heater in
indoor unit.
D: Heat pump models with 2 compressors + electric heater in
indoor unit.
Intermittent red LED: DIP-switch No. 1 in OFF position (see
Fig. 43).
CAUTION: When the red LED is illuminated intermittently
do not try to start up the unit. To correct this status, DIP-
switch No.1 must be in the ON position after having been
RESET.
REFRIGERANT LINE CONNECTIONS
Connection between units
The 38XTZ outdoor units must be connected with the 40ABZ/
ALZ indoor units with refrigerant-grade copper pipes for correct
operation.
For each compressor in the 38XTZ 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 environmental
influences.
- Insulate the suction line along its complete length, and the
liquid line when it passes through any support, wall, etc.
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.
Refrigerant piping design
The design and sizing of the pipe diameters depends on the unit
location which can be:
Model Correct connection Board
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