About The Basic Control Of Vkm - Daikin VAM-FA8VE Technical Data Manual

10.4.3 Caution when Connecting the Indoor Unit Directly to the Duct
2
10
SA

10.5 About the basic control of VKM

10.5.1 Basic control of VKM
250
• HRV • VKM-GA(M)V1
Follow the indications described below
a) When connecting the indoor unit directly to the duct, always use the same system on the indoor unit as
with the outdoor unit, perform group-linked operation, and make the direct duct connection settings from
the remote controller. (Mode No. "17 (27)" – First code No. "5" – Second code No. "6".) Refer to 15.10.1
concerning setting method.
EA
OA
Suction
grille
RA
b) Do not connect to the outlet side of the indoor unit. Depending on the fan strength and static pressure,
the unit might back up.
c) When it is connected to the suction side of indoor unit as a direct duct connection system, etc., since
there is a possibility that the body thermo of the indoor unit detects erroneously SA discharge from this
unit as indoor air, use the remote sensor (Optional).
VKM sucks the air after OA has subjected to total heat exchange with RA, detects the air temperature by
means of the thermistor for inlet air into DX-coil (R3T) to make a judgment on operation mode, cooling or
heating and exercises the control on the capacity of air heat exchanger.
Sensor position and its function
VKM consists of indoor unit + total heat exchanger portion.
Dissimilarities with normal indoor unit are :
- Position of thermostat in the normal indoor unit : Position to detect RA temperature
- Position of thermostat in VKM : Position to detect the air subjected to total heat
Therefore, the temperature detected by VKM gets lower than that of the indoor unit thermostat.
Doing so allows VKM to perform treatment of outside air with stability even as the indoor unit stays thermo-
OFF state because of big difference between the set temperature and suction temperature even though the
set temperature of VKM and indoor unit are the same.
Divert the module of indoor unit
R1T
Thermistor for
indoor air
RA
DX-Coil
SA
Humidifier
electronic
expantion
valve
Thermistor for
gas line temperature
• HRV • Heat Reclaim Ventilation
exchange between OA and RA.
Divert the module of total heat exchanger
Total heat
R4T
exchanger
Thermistor for
element
liquid line
temperature
R3T
Thermistor or inlet air into DX-coil (R3T)
-
This thermistor exercises the control on the capacity of
heat exchanger by means of electronic expantion valve
in accordance with the difference between detected
temperature and set temperature.
-
In the case of automatic mode, judgment on operation
R5T
mode, cooling or heating is made based on the detected
temperature.
OA
R2T
Thermistor for
outdoor air
EA