Electronic Control "QRCE" User Manual
firmware 0.27
Rev.09
EN 18/ 23
ENG
6.3.
Cooling / heating mode changeover
Cooling / heating mode can be switched by:
•
Digital input
o
Open= Summer
o
Close= Winter
•
Remote keyboard
•
BMS via Modbus
•
Automatically with fresh air sensor:
o
If
Te <
= Winter mode (heating)
o
If
Te >
+
= Summer mode (cooling)
(password) 1
Fresh air temperature set point for automatic changeover
15.0°C
Season changeover differential
10.0°C
6.4.
Water coil antifreeze
Here are the parameters to enable the frost sensor:
(password) 1
(
Enable antifreeze)
no
–
yes*
(password) 1
(set antifreeze)
Set point antifreeze
5.0°C
The antifreeze is managed using the supply air temperature (BTM).
Alarm and error active only in heating mode, if electric preheater is installed on the unit it is activate for a set period
to try to increase the temperature before entering in alarm condition.
When the antifreeze alarm is active the fans are Off, the dampers closed, the valve opened.
In case of antifreeze sensor fault:
•
When the unit is in stand-by the valves opens in the fresh air temperature is lower than antifreeze set point
6.5.
Defrost
Defrost management is done by the exhaust air temperature sensor.
To enable a defrost strategy at least one of the following devices have to be available:
•
Electrical pre-heater
•
Inverter modulating fans
Here under the path of the parameter to enable the defrost:
(password) 1
Cooling
Te
Heating
Te = Air fresh temperature
