Fuji Electric FRENIC-HVAC User Manual page 202

 Employing external cooling
UL open type-rated inverters (230 V class series inverters of 75
HP or above and 460 V ones of 150 HP or above) can employ
external cooling by changing the positions of the mounting bases.
In external cooling, the heat sink, which dissipates about 70% of
the total heat (total loss) generated into air, is situated outside the
equipment or the panel. The external cooling, therefore,
significantly reduces heat radiating inside the equipment or panel.
Prevent lint, paper fibers, sawdust, dust, metallic chips, or other foreign materials from getting into the
inverter or from accumulating on the heat sink.
A fire or accident could occur.
To employ external cooling, change the positions of the top and bottom mounting bases from the edge to
the center of the inverter as shown in Figure 5.1-2.
Screws differ in size and count for each inverter. Refer to the table below.
Inverter type
FRN075AR1S-2U M6 × 20
FRN100AR1S-2U
FRN125AR1S-2U
M5 × 12
FRN150AR1S-4U
FRN200AR1S-4U
FRN250AR1S-4U
FRN300AR1S-4U
M5 × 16
FRN200AR1S-5U
FRN250AR1S-5U
FRN300AR1S-5U
FRN350AR1S-4U M5 × 16
FRN450AR1S-4U
M5 × 16
FRN500AR1S-4U
FRN600AR1S-4U
M6 × 20
FRN800AR1S-4U
FRN900AR1S-4U M8 × 20
FRN1000AR1S-4U
Table 5.1-1 Screw Size, Count and Tightening Torque
Base fixing screw
(Screw size and q'ty)
(3 pcs each for upper and lower sides)
(7 pcs each for upper and lower sides)
(7 pcs each for upper and lower sides)
(8 pcs each for upper and lower sides)
(2 pcs each for upper and lower sides)
(6 pcs each for upper and lower sides)
(8 pcs each for upper and lower sides)
Figure 5.1-1 External Cooling
Case fixing screw
(Screw size and q'ty)
M6 × 12 (3 pcs for upper side)
M5 × 12 (7 pcs for upper side)
M5 × 16 (7 pcs for upper side)
M5 × 16 (8 pcs for upper side)
M5 × 16
(2 pcs each for upper and lower sides)
M6 × 20
(6 pcs each for upper and lower sides)
M8 × 20
(8 pcs each for upper and lower sides)
5-2
Tightening
torque
(N•m)
5.8
3.5
3.5
3.5
3.5
5.8
13.5