Gree DC Inverter Multi VRF

DC INVERTER MULTI VRF INSTALLATION
108
③ Installation of air supply duct
Back wind
Ceiling hoisting
Back wind
Wind supply
No. 1 2 3 4 5 6
Name Hoisting
Return air
duct
Ducted type
indoor unit
Return air
inlet
Supply air bent Air outlet
Note：Fig.6 only shows the installation of back return air inlet.The bottom return air inlet can be
installed according to the back return air inlet. The supply air duct, which is rectangle or round, and
connected with the air inlet/outlet of the indoor unit, should keep open at least one. The round air
duct type should adopt round duct to transmit cold (hot) air to the room. The round air duct should
add a transitionary pipe, whose size should match with the size of supply air outlet of the unit. After
connecting the transitionary pipe, install the round air outlet connection pipe whose longest length
to each individual air outlet should not be over 10m. Ducted type indoor unit model 70 can share 3
trainsitional pipes, while model 100,120 can share 4. The transitional pipe, whose straight length is
200.Round air outlet connection pipe produced by our company, whose diameter is 200, can be
ordered separately as standard fittings. Model 50 and the model below it do not share the round air
vent. The following is the diagram for installation of round air duct.
Note:
1. The longest length of air duct means the general length of the supply air duct to the
farthest supply air outlet plus the general length of return air duct to the relative farthest
return air inlet.
2.To the unit with auxiliary heater, if the round air duct is need to connected, the straight
length of trainsitional air duct should not shorter than 200mm.
7
65
4
3
2
1
Number 1 2 3 4 5 6 7
Name Screw
Return air
duct
Ducted type
indoor unit
Return air
inlet
Transitionary
pipe
Supply air
duct
Air outlet
pipe
④ Setting hole for maintenance
After installation of hidden duct-type unit, manhole must be provided in ceiling on the electric box
side of the indoor unit. In respect to the manhole, the following points must be taken into
consideration:
 For access, the manhole size shall be larger than 500mm×500mm.
 The manhole must be at a possible easily accessible for repair of electric elements and pipe.
 The return air inlet may also be used as manhole for repair of motor.
Supply air
Return air
Return air