Zehnder EASY 5.0
55
The 3 CO
2
and offset terminals can be changed by the user.
When setting the time schedule, it is important to set only one time slot for reduced operation as all the offsets apply to
this operation. If a normal operating period is set, the CO
2
will not be effective and nor will the night cooling.
19.4. LOBBY controller
The LOBBY controller is a closed-loop control of the constant pressure type (or VAV = variable air volume).
The speed of the supply and return air fans is adjusted individually and continuously by means of a PID algorithm in
order to obtain a measured actual pressure equivalent to the setpoint pressure adjusted in the controller regardless of
the (variable) network conditions.
ppm CO2
(adjustable)
Fan offset (%)
(adjustable)
800
0
(corresponding fan % = 40% = ECO reduced operation)
900
15
(corresponding fan % = 55%)
Offset
1000
+Offset
800
2
1000
30
(corresponding fan % = 70% = ECO reduced operation)
Z-MASTER-V1122-CSY-INM-Zehnder Easy5.0
Volume flow
Constant pressure
Pa
Return air
Fresh air (outdoor)
Exhaust air
Supply air
VAS
VAR
Atmospheric
air pressure
Atmospheric
air pressure
Return pressure setpoint
Supply pressure setpoint
Setpoint speed
Setpoint speed
+
+
-
-
PID
PID
TRPS
TRPR
