- 5 -
The first line shows the pressure (in bars), which is measured by the SCMI-01.4 module, and
the second line shows the corresponding calculated evaporation temperature for the specific
refrigerant type. The pressure and the calculated evaporation temperature are displayed and
used for control only in the autonomous pressure (evaporation temperature) control mode.
For the other modes, if the pressure sensor is connected, the pressure and the evaporation
temperature are also displayed, but these values are for information only, and they are not
used to control. After pressing the ▲ key again:
Cset xx%
Cact xx%
The
xx
represents the set (
Cset
) and current (
Cact
) compressor performance in %. After
pressing the ▲ key again, the current speed
Fact
of the evaporator fan and the current
position
ExV
of the expansion valve are displayed.
Fact xxx
ExV xxx
After pressing the ▲ key again:
CurrMode
Stop<
Character
<
indicates the current operation (
Stop
,
Cool
,
Heat
,
Wait
).
If any error of the outdoor unit is detected, the current error code is displayed in the last
position of the main menu of the control module.
Error
AABBCCDD
The
AABBCCDD
represents the four two-digit hexadecimal numbers. Each number can take
values 00, 01, 02, 04, 08, 10, 20, 40 or 80, if one error occurs. If multiple errors occur at the
same time, .the displayed value corresponds to the sum of the hexadecimal values of the
individual errors. This means that single digit can take a hexadecimal value of 0 to F (i.e. 0-9
and A, B, C, D, E, and F). List of errors displayed by the SCMI-01.4 module is given in
Chapter 5 on page 19.
Important Cautions:
The actual performance of the compressor (
Cact
), the current fan speed (
Fact
), the current
position of the expansion valve (
ExV
) and errors are detected by the outdoor unit and
transmitted to the SCMI-01.4 control module SCMI-01.4 via the communication line.
When controlling the outdoor unit performance, the SCMI-01.4 module determines the
compressor speed to achieve the required power. The outdoor unit increases the
compressor speed according to its algorithm, and when a certain speed is achieved, about a
3-minute delay is used to stabilize the operation. These delays are used usually when 30%,
45% (and also 75% for some units) of the compressor speed is achieved, and the SCMI-01.4
module takes this feature of the outdoor units into account.
Summary of Contents for SCMI-01.4
Page 1: ...COMMUNICATION MODULE SCMI 01 4 USER S MANUAL EN ...
Page 31: ......
