Flooded Type Water Cooled Screw Chiller Technical M
anual
55
Manually reset and lock (password is controlled by maintenance personnel) it for three times; oil
pressure difference switch is under ON state.
High/Low Pressure Difference Protection (high pressure – low pressure)
Prerequisites for high/low pressure difference protection:
①
Compressor works (shield when it is started less than 2min or in case of shutdown);
②
High/low pressure difference is less than [0.4mpa], time delay protection
[time delay of
high/low pressure difference protection] reaches 40S;
Conditions for exiting high/low pressure difference protection:
Manually reset; switch of high/low pressure difference is under ON state.
Oil Level Protection of Compressor
Prerequisites for oil level protection:
①
Compressor works (shield in case of shutdown);
②
Switch of
oil level protection disconnects and time delay protection
reaches 30S;
Conditions for exiting oil level protection:
Lock (password is controlled by maintenance personnel) it one time and oil level switch is under
ON state.
Ultrahigh Temperature Protection of Cooling Water
Prerequisites for ultrahigh temperature protection of cooling water:
Outlet temperature of cooling water is no less than
40
℃
[ultrahigh temperature of cooling
water];
Conditions for exiting temperature protection of cooling water:
①
Outlet temperature of cooling water is no more than
40
℃
[ultrahigh temperature of
cooling water] minus 7
℃
(automatic reset) ;
②
Protectively lock it three times (password is controlled by maintenance personnel).
3. Failure Analysis and Solution
3.1 Analysis and Solution of Failure with Failure Code
