Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 863

● Hook the chain of panel outer panel on the holder.
● Tighten 3 screw in the step 1 till the panel outer frame contacts closely with the ceiling material.
● Secure the canvas duct and the panel outer frame with screws.
5 Remove the panel inner frame and install in the reverse order of removal.
6 Cautions for duct installation work
Calculate the draft and external static pressure and select the length, shape and blowout.
Supply air duct
● 1-spot, 2-spot, 3-spot and 4-spot with 200 type duct are the standard specifications. Determine the number of spots based on
following table.
Notes (1) Shield the central supply air port for 2-spot.
(2) Shield the supply air port around the center for 3-spot.
● Limit the difference in length between spots at less than 2:1.
● Reduce the length of duct as much as possible.
● Reduce the number of bends as much as possible. (Corner R should be as larger as possible.)
Ceiling material
Ceiling surface
Supply air port
(to be purchased locally)
FDR22 type FDR28, 45, 56 type
1-spot 2-spot
Bad example
Note (1) When hooking the chain.
make sure to avoid slack-
ness on it by pushing
hard the panel outer
frame against the ceiling
material.
Canvas duct
1 Round head machine screw
Panel outer frame
Indoor unit
Heat
insulation
Return air
port panel
Silent panel
Supply air duct
(to be purchased locally)
FDR71, 90 type FDR112, 140 type
2 ~ 3-spot (1)
Bad example Good example
FDC-HKX
Convas duct
(Optional
parts)
Return air
port panel
(Canvas panel)
3 ~ 4-spot (1)
861