Placement Of The Main Unit; Piping And Insulation; Installation Of The Water System - Gree LSQWRF35VM/NhA-M Service Manual

3.3.7 Placement of the main unit

(1) Place the unit on the foundation.
(2) There should be no clearance between the foundation and the baseboard of the unit.
(3) Lift the unit, put the rubber pad on the foundation and then place the unit on the rubber pad. After
that, be sure the horizontal slope of the unit can't exceed 1/1000. If so, take an adjustment by
stuffing spacers into the clearance between the foundation and the baseboard of the unit until the
slope is satisfactory.
Vibration isolator

3.4 Piping and insulation

3.4.1 Installation of the water system

Considerations stated below shall be taken 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) A filter shall be installed upstream of the water pump, otherwise there will be foreign matter entering
the water system, then generating scale on the surface of heat exchangers.
(6) Construct a temporary bypass around the unit to prevent drainage from flowing back to the interior
of the unit.
(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.
Unit Installation
30
Installation foundation
Drain