Product manual

KPMWC00905-10EN - page 8/24
Ecological HFC 134a refrigerant
The compressors have been designed to operate with R-134a, ecological refrigerant with zero ODP (Ozone Depletion
Potential) and very low GWP (Global Warming Potential) that means low TEWI (Total Equivalent Warming Impact).
Evaporator
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. The evaporator is PED designed,
constructed, inspected and stamped. 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. The evaporator water outlet connections are
provided with Victaulic Kit (as standard).
Condenser
Flooded Shell-and-tube type 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. Condenser is designed to conform
PED. Water side working pressure is designed for 10.5 bar. Standard configuration on water connections side is 2
passes. The condenser water outlet connections are provided with Victaulic Kit (as standard).
Electronic expansion valve
The unit is equipped with the most advanced electronic expansion valves to achieve precise control of refrigerant mass
flow. As today’s system requires improved energy efficiency, tighter temperature control, wider range of operating
conditions, the application of electronic expansion valves becomes mandatory. Electronic expansion valves possess
unique features: short opening and closing time, high resolution, positive shut-off function to eliminate use of additional
solenoid valve, continuous modulation of mass flow without stress in the refrigerant circuit and corrosion resistance
stainless steel body.
Electronic Expansion Valves are typically working with lower ΔP between high and low pressure side, than a thermostatic
expansion valve. The electronic expansion valve allows the system to work with within a wide operating range without
any refrigerant flow problems and with perfect chilled water leaving temperature control.
Refrigerant Circuit
Each unit has 1 refrigerant circuit including:
• 1 or 2 Compressors
• Electronic expansion valve
• Evaporator
• 1 or 2 ( 1/compressor) safety valve on suction side
• Manometers on evaporator and condenser
• Condenser
• Safety valves on evaporator and condenser
• Water pressure differential switch on evaporator and condenser
Electrical control panel
Power and control are located in two sections of the main panel that is manufactured to ensure protection against all
weather conditions. The electrical panel is IP54 and (when opening the doors) internally protected with Plexiglas panel
against possible accidental contact with electrical components (IP20). The main panel is fitted with a main switch
interlocked door.
Power Section
The power section includes circuit breaker, compressors inverters, control circuit transformer.