
G-39
Z-106164_EN ● 00
P
roduct
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nstallatIon
Fig. 20. Modbus Module
OCI
Modbus module
Modbus module (OCI351) is an accessory added
to each TMU as a standard. It provides feedback
information to main controller about key parame-
ters of the heat pump, such as:
• heat pump inlet temperature
• heat pump outlet temperature
• outside temperature
• heat pump fault
Based on these information, additional safety
measures are provided to protect the heat pump.
In case of any heat pump error, supplementary
source is put immediately to operation.
It is not necessary to use a secondary outside tem-
perature sensor for the system, as an input is pro-
vided by the heat pump.
Modbus module