20-30 Refrigerant
Option:
Function:
Select the refrigerant used in the compressor
application. This parameter must be specified
correctly for the pressure to temperature conversion
to be accurate. If the refrigerant used is not listed in
choices [0] through [6], select
User defined
[7]. Then,
use
20-31 User Defined Refrigerant A1
,
and
to provide A1, A2 and A3 for the
equation below:
Temperature =
A2
(ln(Pe + 1) − A1) − A3
[0]
*
R22
[1] R134a
[2] R404A
[3] R407C
[4] R410A
[5] R502
[6] R744
[7] User
defined
20-31 User Defined Refrigerant A1
Range:
Function:
10.0000
*
[8.0000 -
12.0000 ]
Use this parameter to enter the value
of coefficient A1 when
is set to
User defined
[7].
20-32 User Defined Refrigerant A2
Range:
Function:
-2250.00
*
[-3000.00 -
-1500.00 ]
Use this parameter to enter the
value of coefficient A2 when
is set to
User
defined
[7].
20-33 User Defined Refrigerant A3
Range:
Function:
250.000
*
[200.000 -
300.000 ]
Use this parameter to enter the value
of coefficient A3 when
is set to
User defined
[7].
20-34 Fan 1 Area [m2]
Range:
Function:
Used for setting the area of the air ducts in
connection with feedback conversion
pressure/velocity to flow. The unit (m
2
) is
determined by the setting of
. Fan 1 is used with feedback 1. In
case of flow difference control, set
to [1] Difference, if
flow fan 1 – flow fan 2 is to be controlled.
20-34 Fan 1 Area [m2]
Range:
Function:
0.500
m2
*
[0.000 -
10.000 m2]
20-35 Fan 1 Area [in2]
Range:
Function:
Used for setting the area of the air ducts in
connection with feedback conversion
pressure/velocity to flow. The unit (in
2
) is
determined by the setting of
. Fan 1 is used with feedback 1. In case
of flow difference control, set
to [1] Difference, if flow fan 1 – flow
fan 2 is to be controlled.
750
in2
*
[0 - 15000
in2]
20-36 Fan 2 Area [m2]
Range:
Function:
Used for setting the area of the air ducts in
connection with feedback conversion
pressure/velocity to flow. The unit (m
2
) is
determined by the setting of
. Fan 2 is used with feedback 2. In
case of flow difference control, set
to [1] Difference, if
flow fan 1 – flow fan 2 is to be controlled.
0.500
m2
*
[0.000 -
10.000 m2]
20-37 Fan 2 Area [in2]
Range:
Function:
Used for setting the area of the air ducts in
connection with feedback conversion
pressure/velocity to flow. The unit (in
2
) is
determined by the setting of
. Fan 2 is used with feedback 2. In case
of flow difference control, set
to [1] Difference, if flow fan 1 – flow
fan 2 is to be controlled.
750
in2
*
[0 - 15000
in2]
20-38 Air Density Factor [%]
Range:
Function:
100 %
*
[50 - 150 %] Set the air density factor for conversion
from pressure to flow in % relative to the air
density at sea level at 20
°
C (100% ~ 1,2 kg/
m
3
).
Parameter Description
VLT
®
HVAC Drive Programming Guide
128
MG.11.CB.02 - VLT
®
is a registered Danfoss trademark
3
3
