Zehnder EASY 5.0
13
The cooling function is managed by the following parameters:
Fan setpoints:
When cooling is operational, the fan setpoints automatically switch to the normal setpoints plus an offset if this is
configured. In the ECO, DIVA, MAC2 and QUATTRO versions, the normal fan speed setpoints are higher than the
reduced speed setpoints in order to take full advantage of the function. In the LOBBY version, a normal operation
setpoint corresponding to the night cooling setpoint will be configured.
If the air distribution network is equipped with motorised control registers (especially in LOBBY constant pressure), it is
necessary to force their opening by using the activation signal of the cooling function, otherwise the air volume will
remain blocked and the function will be of little use. A cooling fan offset can also be set if you want to ensure that you
achieve an air volume close to the maximum air volume of the machine.
Time setpoints:
Care should be taken not to overlap the normal operation time period with the cooling time period because this would
have the effect of inhibiting the cooling function over the recovery time of the two functions (the cooling activation
signal and the fan offsets will not be operational). Cooling can only be started if the time period for reduced operation is
running or if the central ventilation unit is switched off.
All of the following conditions must be met to activate the function:
■
The user has authorised the cooling operation (accessible parameter)
■
Fewer than 4 days have passed since the unit was operated in reduced or normal mode
■
A time schedule must be active within the next 24 hours
■
The daytime outdoor temperature has exceeded the set threshold (22°C adjustable)
■
Normal operation, external forced operation and restart must be off (not active)
■
The current time is within the permitted operating range (00:00 - 7:00, adjustable)
■
The difference between the return air temperature and the outdoor temperature is insufficient (2°C adjustable with a
hysteresis of 0.5°C).
Parameter
Configuration
Factory setting
Authorisation to run (user condition)
Activated
Activated
Deactivated
Time range for operating authorisation
Start time (adjustable)
00:00
End time (adjustable)
07:00
Fan offset (applied to normal HS setpoints)
Supply air fan (adjustable)
0
Return air fan (adjustable)
0
Outdoor temperature threshold reached during the day
(Adjustable)
22 °C
Outdoor temperature range during the night cooling period
Maximum temperature
(adjustable)
35 °C
Minimum temperature (adjustable) 14 °C
Minimum recovery temperature threshold during the night cooling
period
(Adjustable)
18 °C
Return temperature difference - outdoor temperature
(Adjustable)
2 °C
Blocking time of the hot outputs after night cooling
(Adjustable)
180 minutes
Time between 2 test runs
(Adjustable)
60 minutes
Time to check all temperature sensors
(Adjustable)
180 seconds
Z-MASTER-V1122-CSY-INM-Zehnder Easy5.0
