Cool Mode; Heat Mode - Electra WNG 50 DCI Service Manual

CONTROL SYSTEM
12.3

Cool Mode

NLOAD is calculated according to the difference between actual room temperature and user set
point temperature by PI control.
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 calculated
NLOAD.
12.4

Heat Mode

NLOAD is calculated according to the difference between actual room temperature and user set
point temperature by PI control.
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 calculated
NLOAD.
12.4.1 Temperature Compensation
In wall mounted, ducted, and cassette models, 3 degrees are reduced from room temperature
reading (except when in I-Feel mode), to compensate for temperature difference between high and
low areas in the heated room, and for coil heat radiation on room thermistor.
The temperature compensation can be enabled/disabled by shortening of J2 on the indoor unit
Controller
Model J2 Shorted
Wall mounted Compensation Disabled
Cassette Compensation Enabled
Ducted Compensation Enabled
Floor/Ceiling Compensation Disabled
12.4.2 Indoor Fan Control in Heating Mode
Indoor fan speed depends on the indoor coil temperature:
12.5 Auto Cool/Heat Mode
When in auto cool heat mode unit will automatically select between cool and heat mode according
to the difference between actual room temperature and user set point temperature (.T). Unit will
switch from cool to heat when compressor is off for 3 minutes, and .T < -3.
Unit will switch from heat to cool when compressor is off for 5 minutes, and .T < -3.
12-6
J2 Opened
Compensation Enabled
Compensation Disabled
Compensation Disabled
Compensation Enabled
CONTENTS
SM WNGDCI 2-E.4 GB