Service manual

12-5
CONTROL SYSTEM
SM SX DCI 1-A.3 GB
12.1.9.2 EEV Control for DCI72/72Z/80
The target EEV value is the sum of open loop value (OL) and a result of the accumulative
correction values (CV).


CVOL
EEVEEVEEV
The EEV intial value(OL) is defined as follow:
EEV
OL
= EEVBaseOpenLoop + EEVOpenLoopCpctyCrct + EEVTubeCompnst
Basic EEV open loop Open Loop correction
EEV tube Length
compensation
Mode 72/80 72/80 72/80
COOL 220 25 0
HEAT 170 30 0
*For DCI72Z
The initial EEV
OL
is defined in accordance to the compressor frequency
EEVCV is a correction value for the EEV opening that is based on the compressor temperature,
During the first 6 minutes after SB the correction is not calculated. After that the correction value is
updated every 30 seconds.
12.1.10 RV(Reversing Valve) Control
Reversing valve is on in heat mode.
Switching of RV state is done only after compressor is off for over 3 minutes.
12.1.11 Ioniser Control
Ioniser is on when unit is on ,AND indoor fan is on ,AND Ioniser power switch (on Ioniser) is on.
12.1.12 Base Heater Control
The base heater will be working only when RV is “ON” according to the following graph:
ON
OFF
OAT
0
2
Base
Heater
When OAT is faulty the base heater will be “ON” continuously in HEAT mode.
12.2 Fan Mode
In high/ medium/ low indoor fan user setting, unit will operate fan in selected speed.
In AutoFan user setting, fan speed will be adjusted automatically according to the differencebetween
actual room temperature and user set point temperature.
CONTENT