Daikin VAM350J8VEB Service Manual page 16

2 | General operation
Service manual
16
draft – 07/02/2022 15:12
EKVDX-A/VAM-J8 is a fresh air pre‑treatment solution. Please keep in mind that
this is NOT a comfort solution. It CAN be connected to a VRV IV, VRV IV+ or VRV5
Outdoor Unit. There are some exception for combinations due to R32 safety, such
as VAM350J8 and EKVDX32A2 combination is NOT allowed, these combination
rules are present in the Databook. The unit is delivered by default for VRV5
connection.
VAM-J8 is flexible for installation: CAN be installed horizontally, vertically or upside
down and it is also possible to choose the connecting duct length in function of
installation and available ESP conditions. EKVDX-A however, is NOT flexible for
installation as you might expect, because it is a DX unit. See installer reference
guide for more details.
VAM-J8 unit CAN be installed stand‑alone as a Heat Recovery Ventilator while
EKVDX-A CANNOT be installed stand‑alone.
The two units are connected to each other with the use of field supplied ducts.
Depending on the combination of units a duct reducer may be required in order to
match the diameter of the duct connection of the two units. The reducer is placed
inside the EKVDX-A unit for easier transportation.
Operation logic
a
b
VAM
a Return side
b Supply side
c Duct
d Suction thermistor R1T
e Discharge thermistor R5T
f Target temperature
Measurement
Control
When combining VAM + EKVDX-A, the setpoint on the remote controller will be the
target temperature that supply air should have at the end of the duct (just before
the ventilated room). Achieving the target temperature will be done indirectly via
the measurement of R5T (temperature after coil) and a correction factor (CF)
functionality available on the remote controller:
▪ If ducting is long or NOT well insulated or R5T does NOT correspond to the
average supply air temperature, target temperature will be different than R5T. In
these cases CF CAN be applied to increase/reduce evaporation/condensation
temperature to achieve such R5T which will result to the required target
temperature.
In cooling, target
In heating, target temperature = R5T − CF
▪ If ducting is short or well insulated, the installer can consider that R5T= target
temperature, so NO need to set any CF (CF=0 by default).
▪ Correction factor CAN be set by field setting 20-13. Default setting is 0. CF CAN
be set in range 0~7 with increments of 0.5.
f
c
d EKVDX e
temperature =
VAM350~2000J8VEB + EKVDX32~100A2VEB
R5T + CF
VRV system air conditioner
ESIE22-07 – 2022.02