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A Series Inverter Modular Air-cooled Chiller (Heat Pump)
4.7 Installation of the water system
■ Considerations stated below shall be taken carefully for the water system.
(1) Each water inlet and outlet should be labeled properly to avoid misconnection.
(2) A flexible connector should be used at the chilled water outlet to reduce vibration transmission.
(3) A manometer, a thermometer and a gate valve shall be installed at the chilled water inlet/outlet.
Moreover, a drain valve shall be installed at the outlet and an air release valve shall be installed at
the inlet. At the highest point of the water system, another release valve shall be installed, while at
the lowest point of the water system, another drain valve shall be installed to facilitate drainage.
(4) The water inlet/outlet pipe should be tightly insulated to reduce heat loss and dewing. When pipes
are exposed under 0°C, a electric heater shall be installed.
(5) There surely be some foreign matters in the water system which would generate scale on the
surface of the heat exchanger, so a filter shall be installed upstream of the water pump.
(6) The unit shall be bypassed during flushing to prevent drain out from entering the system.
(7) Under ultra-low temperature in winter, showdown at night will cause the evaporator and pipeline
frozen up, so it is highly recommended to add alcohol and propanol mixture in chilled water. Do not
cut off the power supply when the unit is turned off, otherwise the freeze protection does not work.
Alternatively, cut off the power supply and drain the water system thoroughly.
(8) In case a low load protection occurs, when a unit is required to run under its low load, the minimum
capacity of its water system should be ensured. The minimum capacity of the water system =
water volume (10L) for 1kW heat exchange capacity × rated cooling capacity. For instance, the
rated cooling capacity of the model LSQWRF35VM/NhA-M is 32kW, so the minimum capacity of its
water system should be 320L (=10L/kW × 32kW). When several units work in a modular way, the
minimum capacity of the modular water systems should be the sum of the minimum one of each
model. A water tank should be required for water piping of low capacity, otherwise the capacity of
a unit will be not consistent with its loads, thus resulting in low load protection and reduced service
life.
Never use salt mixture to prevent the unit from being corroded.
NOTE
17
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