17
English
Liebert HPM --- A/W/F/D/H
Maintenance schedule
COMPONENT
MAINTENANCE
PERIOD EVERY
1Month
3Months
6Months
1Year
FANS
Attention, do not
reach into the fan
while the fan
wheel is running.
Check for soiling, damage, corrosion, and proper fixing. X
Check bearings noise. X
Measure the current and power consumption. X
Cleaning to preserve the function. X
AIR FILTERS
Check for soiling, damage, corrosion. X
Check state of filter. X
Clean or replace if necessary. X
Carry out controls more frequently in dusty environments. X
NEW AIR FILTER
(if installed)
see air filter. Clean or replace X
CONTROL
SYSTEM
Check for proper and functionally correct installation and surrounding conditions. X
Check the function of the LEDs of the display’s control system and the alarms. X
Check the connections for electrical and mechanical function. X
Check the functional elements (e.g. operational controls and display devices). X
Check the electrical/electronic and pneumatic input signals (e.g. sensors, remote
controllers, command variable) for compliance with nominal values.
X
Check control function, control signals, and safety chains. X
Adjust control function and control signals. X
HUMIDIFIER
(if installed)
See appendix A.
SWITCH CABINE T
POWER CIRCUITS
Attention,
electrical
cables and
electrical components
of the air co nditioner
are under voltage.
Check the power supply on all phases. X
Check the connections for electrical and mechanical function. X
Check the power supply at all terminals. X
Measure power consumption at all connected consumers. X
Set, adjust, and tighten the functional elements (e.g. operational controls and display
devices).
X
Check safety equipment, e.g. thermal switch. X
Replace fuses (every 2 --- 3 years) X
Check protective covers for completeness. X
COOLING WATER
(W, F and H only)
Check cooling water circuit. X
Check for damage, leaks, and proper fixing. X
Makesurethereisnolossofwater.
COOLING WATER
(W, F and H only)
Only for closed
circuits:
Make sure that the water pump works properly. X
Deaerate circuits. X
Check whether the heat transfer medium of circuit---connected system is frost--- proof. X
Check safety equipment for function.
Check glycol% comparing minimum yearly ambient temperature. X
Fluoride refri-
gerants in-
crease the green--- house
effect and are subject to
restrictions and norms,
according to the national
and European regula-
tions.
REFRIGERATION
CIRCUIT
Measure the working pressures and temperatures (to be done by a refrigeration
technician).
X
Check the power consumption, measure head temperature, and check for possible
abnormal operating sounds.
X
Make sure that there is no frost building up on the evaporator and compressor. X
Check function of all regulating devices (power regulators, valves, etc.). X
Check safety devices for function. X
If the quantity of refrigerant is not enough, it needs to be reclaimed and refilled with
completely new refrigerant.
Check oil level at the sight glass. X
Carry out a test to ceck humidity inside oil X
Check valves and replace if necessary on industrial piston compressors (every 2 years). X
Check crankcase heater for function. X
EXTERNAL
CONDENSER/
Dry cooler
(if installed)
Seeappropriatemanual.
CHILLED WATER
CIRCUIT
(D and H only)
Makesurethereisnolossofwater. X
Deaerate the cooling water circuit using the vent valve on the top right hand side of the
cooling coil.
X
Check that the cold water supply is ensured. X
Check the temperature and the pressure of the water on the inlet and outlet side using
thermometers and manometers if installed.
X
Check the proper function of the three---way valve. X
Make sure that the system is filled with the prescribed amount of glycol and that there is
no frost in the hydraulic circuit.
X
In case water loss needs to be refilled make sure the glycol concentration is correct. X
Check that the water circulation is in perfect order. X
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