Daikin VAM Series Engineering Data page 53

EDMMT712101
Fan Control by CO
Purpose • Functions
This is the function to automatically change airflow rate of Heat Reclaim Ventilator Unit according to the changes in CO
when the ventilation rate "Auto" is selected.
POINT
This function is not designed to maintain a constant CO
CO level may exceed the base concentration depending on the operating environment, product installation conditions and the
2
model selected.
Airflow rate is not automatically changed during bypass mode operation.
Unit operation
Linear control
High notch operation for 20 minutes after the start of operation
CO concentration is judged by the CO
2
Operating time of each notch is determined according to the CO
concentration at the time of detection.
(Operation pattern depending on CO
When the detected concentration is 700ppm or less, continuous operation
is performed at low notch.
※ When the detected concentration is 550ppm or less, it is possible to
change the pattern from "low fan operation for 30 minutes" to "low fan
operation for 20 minutes/stop for 10 minutes" by field setting.
Notch control (Notch A, Notch B)
High notch operation for 20 minutes after the start of operation
The notch is determined according to the concentration at the time.
Once a notch has been decided, the notch is fixed for 10 minutes.
After 10 minutes have elapsed, the notch is checked every 5 minutes based on CO
different from the existing notch, the notch is changed accordingly.
Step CO
7
6
Base
5
concentration
4
3
2
1
0
Switch number that needs to be changed for the system
Field settings using remote controller is required.
Field settings using remote controller
Setting descriptions
Table setting
Reference CO concentration shift ※1
2
Setting to allow fan stop
Bypass mode airflow rate setting ※2
※ 1 . This setting is made to shift the base CO
※ 2 . This is the setting to enhance outside air cooling effect by increasing the airflow rate of bypass mode when the ventilation rate
"Auto" is selected.
VAM-HVE/HVLT Series
Sensor
2
2
sensor every 30 minutes.
2
concentration is fixed)
2
concentration
2
(ppm)
Linear control (minute)
Ultra high High
30
1450
20
1300
10
1150
1000
850
700
550
400
Mode Setting switch
No. No.
18 (28) 6
7 No shift
19 (29) 8 Allowed
9 Ultra high
concentration used as a reference (unit: ppm).
2
concentration in the room.
EA
2
OA
concentration and if the appropriate notch is
2
Table (field setting)
Notch A Notch B
Low Stop
H
10 H
20 M
30 M
20 10 M
10 20 L
30 L
20 10 L Stop
Setting position
01 02 03 04
Linear — Notch A Notch B
+200 +400 +600
Prohibited Allowed Prohibited
High —
concentration
2
H: Ultra high
M: High
L: Low
H
H
M
M
L
The CO concentration mentioned in the
2
L
table is the concentration detected by the
L
sensor for automatic airflow rate control.
It may differ from the CO concentration in
2
the room.
Factory default setting
05 06 07
— — —
-200 -400 -600
— — —
— Not fixed — —
Control System
RA
CO sensor
2
SA
51