Zehnder EASY 5.0
37
15.12. Frost protection alarm details
When the frost protection alarm is active, this means that the temperature of the frost protection thermostat bulb
attached to the hot water heating coil has fallen below +5°C (factory setting) and that there is a risk of the heating coil
freezing up when filled with primary water (without MEG/MPG anti-freeze additive). The ventilation is stopped
immediately (quick stop), there is no post ventilation, and the heating coil output is forced to 100% in order to open the
3-way valve for the heating coil water supply to a maximum and thus raise the temperature as quickly as possible.
When the thermostat bulb temperature rises above +5°C, the unit restarts automatically (class C alarm = automatic
acknowledgement) and the position signal of the 3-way valve returns to the value calculated by the PID of the heating
sequence.
16. BMS communication
16.1. General
The controller has the following 2 external communication ports:
■
Port P1: Modbus RTU RS485 (slave) or Bacnet MS/TP
■
TCP-IP port: Modbus TCP or Bacnet IP or web server
When a communication is active on a port, the corresponding green status LED flashes:
When a network search is performed to identify the controller, it appears as “CALADAIR AHU” and model “CLD-283-
WEB-5.0”.
Z-MASTER-V1122-CSY-INM-Zehnder Easy5.0
1G
-
+
2GD
P1
R
xTx
P2
R
xTx
TCP/1P
P/B
B 50
A 51
P 1
P 2
N 52
E 53
B 60
A 61
N 62
E 63
DI1a 71
DI2a 7
2
DI3a 7
3
DI4a 7
4
DI5a 7
5
DI6a 7
6
DI7a 77
DI8a 7
8
AO1a 91
AO2a 92
AO3a 93
AO4a 94
AO5a 95
ANGD 90
Ext.
Disp.
4+C
10 GDO
11 DO1b
12 DO2b
13 DO3b
14 DO4b
15 DO5b
16 DO6b
17 DO7b
30 A
GND
33 A
GND
40 A
GND
43 A
GND
31 AI1a
32 AI2a
34 AI3a
35 AI4a
41 UI1a
42 UI2a
44 UI3a
45 UI4a
3
TCP/IP port LED status
P1 port: RS485 for Modbus RTU or BACnet MSTP
P2 port: Reserved for the communication with Zehnder EDT2 or
slave controller
TCP/IP port (RJ45): for Modbus TCP, BACnet IP or web server
P2 port LED status
P1 port LED status
