Argo AEI1G 42 EMX, Technical Data & Service Manual

Page: 12 / 39

12
Cooling mode
When the system is in cooling mode, it will regulate the cooling capacity delivered to the rooms to
decrease the room air temperature (RAT) to the set point (SPT) and to balance the thermal load of the
rooms to keep the set point temperature.
The following rules apply to cooling mode functioning:
-
Compressor and fan start when, in any of the rooms, RAT is 1°C or more above the SPT
-
Compressor and fan stop when, in all rooms, RAT is 2°C or more below the SPT or when RAT is 1°C
below the SPT for more than 1 hour
During the first 3 minutes of operation:
-
Compressor and fan run at a fixed speed (2 minutes at low speed and 1 minute at intermediate
speed)
-
EEV is open at a fixed value
After the first 3 minutes of operation, compressor and fan speeds are regulated by:
-
the thermal load calculation of all the rooms
-
the level of protecion of the system
During cooling mode, 4-way valve is deactivated.
Dehumidification (dry) mode
When an indoor unit is in dry mode, the unit will operate according to the following table:
Notes:
-
When dry mode is active, the temperature of the room could decrease below the setpoint
temperature if the thermal load of the room is low.
-
During dry mode, 4-way valve is deactivated.
RAT DRY LEVEL DESCRIPTION
≥ SPT + 2°C 0 Unit operates normally in cooling mode.
< SPT + 2°C
≥ SPT - 1°C
1
Unit operates with a fixed cooling demand.
Indoor fan switches between very low speed and
low speed every 30 seconds.
< SPT - 1°C
≥ 10°C
2
Unit cycles between a period of operation with a
fixed cooling demand (3 minutes) and a period of
non operation (9 minutes).
Indoor fan switches between very low speed and
low speed every 30 seconds.
< 10°C DRY OFF Unit is not operating.