46 Chapter 10 Maintenance & Spare Parts
Liebert.CRV Series Air Conditioner User Manual
4) For equipment with double refrigeration circuits, in regards to differentiates requirements on the basis of the
quantity of f-gas contained, the required information about refrigerant charge quantities has to be listed separately for
each individual circuit.
5) For equipments with separate indoor and outdoor sections connected by refrigerant piping, the label information
will be on that part of the equipment which is initially charged with the refrigerant. In case of a split system (separate
indoor and outdoor sections) without a factory pre-charge of refrigerant, the mandatory label information will be on
that part of the product or equipment which contains the most suitable service points for charging or recovering the
fluorinated greenhouse gas(es).
8. Safety data sheets of f-gases used into the products are available on demand.
10.11 Unit Diagnostic
The possible cause and corrective action of the unit problem are listed in Table 10-4.
Table 10-4 Unit diagnostic
Problem Possible cause Corrective action
Racks temperature is too high
Dirty filters Replace filters
False filter clogs Call Emerson services
Incorrect positioning of remote
temperature sensor(s)
Verify remote temperature sensors correct
positioning
Remote temperature sensor(s) issue Call Emerson services
Too high condensation pressure
(A units) verify remote condenser fans are
running
(W units) check cooling water supply
(W units) check cooling water temperature
Call Emerson services
(C unit) inlet water temperature is too high
Check cooling water temperature
Refrigerating circuit charge issue Call Emerson services
Cold air short-circuiting issues
Verify unit positioning/room configuration
Verify unit air-baffles set-up
Verify cold aisle containment seals (if applicable)
Insufficient room cooling capacity Reduce racks heat load or add cooling units
(C unit) water regulating valve issue Call Emerson services
Unit safety devices intervention Call Emerson services
Unit fan fail to start The fan is faulty Call Emerson services
Water drops carried by airflow
Room humidity is over acceptable limit Check room condition
Condensate pan drain is clogged Call Emerson services
Problem to humidifier control Call Emerson services
Water on the floor around the
unit
Unit is not properly levelled Adjust the levelling feets
Unit condensate drain pipe is clogged Remove pipe obstruction
(C and W units) leak in the water circuit Locate the leak and fix it
Piping insulation broken/damaged Restore insulation integrity
Leak in the draining circuit Call Emerson services
Condensate pump is faulty Call Emerson services
Leak in the humidifier filling hose Call Emerson services
Cooling unit noise level is too
high than expected
Incorrect positioning of remote
temperature sensors
Verify temperature sensors correct positioning
Unbalanced heat load distribution Enhance racks heat load distribution
Remote temperature sensor(s) issue Call Emerson services
Unsteady air delivery
temperature
Faulty temperature sensor Call Emerson services
Unit controller issue Call Emerson services
Local display not operational
but unit operates
Local display cable disconnected Connect the cable
Local display cable damaged Replace cable
Local display configuration lost Call Emerson services
Local display not operational
and unit does not operate
Unit electrical supply is off Restore electrical supply
Unit main switch is off Switch on the unit
Control board supply issue Call Emerson services
Control board issue Call Emerson services
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