Flooded Type Water Cooled Screw Chiller Technical M
anual
53
①
After compressor operates for 10min;
②
Inlet and outlet water temperature difference of condenser is no more than 2
℃
and
abnormal time delay reaches 1min.
Conditions for exiting temperature difference protection under too large water flow:
Manually reset and lock (password is controlled by maintenance personnel) it after three times of
accumulated protection within 48 hours.
Low Pressure Protection
Prerequisites for low pressure protection:
①
Unit is under operation or standby state;
②
Pressure of air suction pressure sensor is lower than [0.39MPa] set value of ultralow protection
for low pressure] maintenance (second-class), and abnormal time delay reaches 10S;
Conditions for exiting low pressure protection:
Manually reset; pressure of air suction pressure sensor is higher than ultralow protection of low
pressure plus 0.15;
Overload Protection of Compressor
Prerequisites for overload protection:
①
Unit is under operation or standby state;
②
Overload switch is under On state and protection time delay reaches
3s;
Conditions for exiting overload switch protection:
Manually reset; overload switch is restored to OFF state.
Anti-freezing Switch Protection
Prerequisites for anti-freezing switch
protection:
①
Unit is under operation or standby state;
②
Magnetic anti-freezing switch (4
℃
) disconnects.
Conditions for exiting anti-freezing switch
protection:
Manually reset;
Ultralow Outlet Water Temperature Protection (no alarm information)
Prerequisites for ultralow outlet water temperature protection:
○
1
Unit is under operation or standby state;
○
2
Outlet water temperature is no more than 5
℃
.
