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anti-freezing protection when environment temperature > 2°C.
5) When failure in environment temperature sensor, if compressor stops for 30 minutes, then
use coil temperature sensor to instead.
6) When failure in inlet water temperature sensor, then use outlet water temperature sensor
to instead.
7) When failure in inlet and outlet water temperature sensor, if environment temperature or
coil temperature after compressor stops for 30 minutes, meets conditions of anti-freezing,
then enter anti-freezing protection.
2.7.4 Work in series
1) When several machines work in series, one machine works as master, the others work as
slave
a. The slave machine operates according to instructions of heating requirement from master
machine.
b. Machines stop working when water temperature reaches the setting value of master
machine.
c. Slave machine operate according to water temperature setting value of master machine
and provide heating. It stops or protects according to failure in itself.
2) Quantity of machines in series: Maximum 8 machines work in series, which can be of
same or different capacity.
a. Machines start working from machine 1 to machine 8 in turn.
b. Machines stop working from machine 8 to machine 1 in turn.
3) It can display master or slave on current control panel of each machine. When machines
work in series, the bigger capacity machine is as master.
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