10 | WSU PRODUCT DATA
MULTI V Water 5 Water Source Unit Engineering Manual
Due to our policy of continuous product innovation, some specications may change without notication.
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MECHANICAL SPECIFICATIONS
Refrigeration Oil Control
The oil return system uses the following technologies:
High Pressure Oil Return (HiPOR)
Oil is captured from compressor discharge by the centrifugal
oil separator and then returned to the compressor through
a separator oil injection pipe, preventing mixing of oil and
refrigerant on the suction side of the compressor.
Smart Oil Control
Smart oil control monitors the oil level inside the compressor
and initiates an oil return cycle to flush oil in the pipe system
back to the compressor only when the oil level is too low.
Timed oil return cycles are not necessary and the compressor
is protected from operating at oil levels that are too low.
Compressors
Each WSU frame is equipped with one hermetic, digitally-con-
trolled, inverter-driven scroll compressor to modulate capacity
(variable from 15 to 150Hz. The compressor has a built-in oil
level sensor to provide real-time oil control.
Heat Exchanger
The water heat exchanger is a stainless steel, type SUS316, refrigerant / water plate heat exchanger. The heat exchanger requires a
field-provided 50 mesh strainer and water treatment to prevent scaling inside the heat exchanger. Closed loop condenser water systems are
recommended to protect the factory-mounted heat exchanger.
Electrical
Both heat pump and heat recovery WSUs are available with a choice of 208-230V, 60 Hz, 3-phase or 460V, 60 Hz, 3-phase input power
supply. All WSUs are capable of operating within voltage limits of ±10% rated voltage, and include overcurrent protection.
Controls
Heat pump and heat recovery WSUs are factory wired with the necessary electrical control components, integral microprocessors, printed
circuit boards, thermistors, sensors, terminal blocks, and power lugs.
The control circuit between the indoor units, heat recovery units (Multi V Water 5 systems) and the WSU is an RS-485 daisy chain
communication bus. The cable is two conductor, stranded and shielded, 18 AWG.
Microprocessor-based algorithms provide component protection, soft-start capability, refrigeration system pressure and temperature control.
The variable water flow control kit allows condenser water temperatures below 59°F. This accessory also works with condenser water
pumps equipped with variable frequency drive to save pumping energy.
Variable Water Flow Control Kit
The variable water flow control kit (PWFCKN000) is required for applications with entering water temperatures below 59ºF (one kit per
frame). Minimum flow rate must be 40% of the nominal flow rate, 2-10V signal with a linear flow response valve.
For Heat Recovery Unit information, refer to the applicable Engineering Manual on www.lghvac.com.
Multi V Water 5 Water Source Units
Figure 3: Dual Frame Multi V Water 5 Water Source Unit.
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