Product manual

KPMWC00905-10EN - page 22/24
CHILLER COMPONENTS
Compressors
1. The unit shall utilize magnetic bearing, oil-free, semi-hermetic centrifugal compressors. The compressor drive
train shall be capable of coming to a controlled, safe stop in the event of a power failure.
2. The motor shall be of the semi-hermetic type, of sufficient size to efficiently fulfill compressor horsepower
requirements. It shall be liquid refrigerant cooled with internal thermal sensing devices in the stator windings. The
motor shall be compatible with variable frequency drive operation.
3. The chiller shall be equipped with an integrated Variable Frequency Drive (VFD) to automatically regulate
compressor speed in response to cooling load and the compressor pressure lift requirement. Movable inlet guide
vanes and variable compressor speed, shall provide unloading. The chiller controls shall coordinate compressor
speed and guide vane position to optimize chiller efficiency.
4. Each compressor circuit shall be equipped with a line reactor to help protect against incoming power surges and
help reduce harmonic distortion.
Evaporator
Water side working pressure is designed for 10,5 bar. Vessels include 1” NPT spring loaded pressure relief valves. Shell
and non-connection water heads are insulated with 3/4” thick closed cell insulation. Standard configuration on water
connection side is 2 passes.
9 The units will be equipped with a flooded shell-and-tube evaporator operating with refrigerant in shell and water
in tubes. Replaceable water tubes are fabricated from integral finned copper and mechanically bonded to steel
tube sheets.
9 The evaporator will have 1 circuit and standard configuration on water connection side is 2 passes.
9 The water connections shall be VICTAULIC type connections as standard to ensure quick mechanical
disconnection between the unit and the hydronic network.
9 Evaporator is manufactured in accordance to PED approval.
Condenser
9 Condenser will be flooded shell-and-tube operating with refrigerant in shell and water in tubes. Replaceable
water tubes are fabricated from integral finned copper and mechanically bonded to steel tube sheets.
9 The units will have one condenser on the refrigerant circuit
9 Standard configuration on water connection side is 2 passes.
9 The water connections shall be VICTAULIC type connections as standard
9 Condenser is manufactured in accordance to PED approval.
Refrigerant circuit
9 The unit must have one refrigerant circuit.
9 Each circuit shall include as standard: electronic expansion device piloted by unit’s microprocessor control,
sight glass with moisture indicator and insulated suction line.
Control panel
1. The unit shall have a microprocessor-based control system consisting of a 15-inch VGA touch-screen operator
interface and a unit controller.
2. The touch-screen shall display the unit operating parameters, accept setpoint changes (multi-level password
protected) and be capable of resetting faults and alarms. The following parameters shall be displayed on the
home screen and also as trend curves on the trend screen:
• Entering and leaving chilled water temperatures
• Entering and leaving condenser water temperatures
• Evaporator saturated refrigerant pressure
• Condenser saturated refrigerant pressure
• Percent of 100% speed (per compressor)
• % of rated load amps for entire unit
3. In addition to the trended items above, all other important real-time operating parameters shall also be shown on
the touch-screen. These items shall be displayed on a chiller graphic showing each component. At a minimum,
the following critical areas must be monitored:
• Compressor actual speed, maximum speed, percent speed
• Evaporator water in and out temperatures, refrigerant pressure and temperature
• Condenser water in and out temperatures, refrigerant pressure and temperature