GREE GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
33
the aperture opening rate of shutters must be at least 80%, and the angle between the shutters
and the horizontal plane should be less than 20°. Requirements for installing exhaust air duct are
as follows:
i. Basic requirement for connecting an ODU to static pressure ventilating duct
When an ODU needs to be connected to the static pressure ventilating duct, the ventilating duct
must be reasonably designed. The pressure loss caused by the ventilating duct must be calculated. In
addition, a proper type of ventilating duct is necessary. To connect he static pressure ventilating duct to
the ODU, three basic parts are required: (1) ODU; (2) canvas; and (3) steel-plate ventilating duct. The
ODU must be interconnected with the ventilating duct through canvas to prevent abnormal vibration and
noise generated by the steel-plate ventilating duct. The joint part must be tightly sealed with tin foil to
avoid air leakage.
ii. Preparations for connecting an ODU to static pressure ventilating duct
a) The ODU is installed properly based on the unit installation requirement.
b) The steel-plate ventilating duct is designed based on the unit and engineering requirement, and
is installed properly according to the engineering standards.
c) Based on the unit dimensions and the size of steel-plate ventilating duct, prepare materials such
as canvas casing, tin foil, steel bar and tapping screw, as well as tools such as hand-operated
electric drill, air screw driver and screwdriver.
iii. Basic operation of connecting an ODU to static pressure ventilating duct
Two methods are available to connect an ODU to static pressure ventilating duct.
Method 1:
a) Install the ODU (2) and steel-plate ventilating duct (1). Use an air screw driver or screwdriver to
unfasten the tapping screws that fixing the top case component (3), and then remove the top
case component. Take out the grille from the top of the top case component and leave the top
case.
b) Put the canvas casing inside out (4). Cover one end of the canvas casing over the unit downward
until the canvas end face is aligned with the unit or a bit higher than the top of the unit. Then, put
the top case back (3) and tightly press the canvas casing (4). Use tapping screws to fix the top
case onto the unit (3).
c) Pull up the canvas casing reversely (4) and use the steel bar (5) to press the canvas casing
tightly onto the counter flange of the steel-plate ventilating duct (1). Use a hand-operated electric
drill to drill holes and fasten the parts by using tapping screws.
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