Programming Fresh-Air
15
5 Programming Fresh-Air
The Fresh-Air controller cards allows the end-user to precise-
ly control the fresh-air temperature introduced into the dif-
ferent volumes of the vessel. It also allows humidity control.
Basically the end-user sets a differential between the outside
air temperature and the air temperature he wants to intro-
duce into the vessel. There is also a ceiling limit which can
be programmed separetly to avoid that the freshair temper-
ature becomes too cold and uncomfortable during night op-
eration when outside temperatures drops too low.
5.1 Digital Display Fresh-Air Control
The Fresh-Air Control display will give the following imme-
diate read-outs :
1) Normal Read-out: Air-out temperature after treatment.
Push <F> key to obtain (examples):
2) 2b 3 = Extraction Blower setting
3) 1b 3 = Fresh-Air blower setting
4) H 9.6 = chilled water temp. read-out
5) E 35.2 = outside air temp. read-out
6) U232 = AC voltage input reading
5.2 Start-up Procedures
When starting up the Fresh-Air control the Fresh-air blowers
will operate at the lowest possible speed setting to draw
down the air-out temperature as quickly as possible to the
reference set-point and to eliminate accumulated moisture
in the air-ducting.
After the start-up period the Fresh-Air blower speed will re-
sume operation at the speed setting as initially pro-
grammed.
Speed setting of the Fresh-Air and Extraction Air blowers
can be different so as to obtain the desired over-pressure in
the vessel.
The <F> key also gives access to such parameters as:
– reheat 1/2 on/off
– time delay between Fresh-Air Blower start and Extraction
Blower start-up
– differential between Reheat 1/2 cut-in and reference set-
point.
See also 5.7.2 "Programming through Sun Key" and 5.7.3
"Programming through Snow Key".
Higher
values
(Sun)
Read-out
(0)
Lower values
(Snow flake)
Blower speed Function
(F)
Cool cycle
mode
Automatic
operation
Heat cycle
mode
On / Off
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