Ductwork Recommendations - Trane RTRA Series Installation Operation & Maintenance

Ductwork recommendations

Free discharge or abrupt discharge into a plenum will be
avoided, each fan discharge should have a mimum of 1,5
meter duct to avoid an excess of pressure drop.
On the units with 3 fans, each fan can be individually
ducted or the single fan will be ducted with a ''pants''
section. The single fan is identified on the submittal
drawing.
On the units with 4 fans, each fan can be individually
ducted or each double fan can be ducted with a ''pants''
section.
Figure10 - Recommended ductwork
pant section
Note : To avoid air recirculation through the ductwork, we recommend to put backdraft dampers only on the double
fan situated on the right side when facing the condensing coil for the RTRA 109 HE and 110 HE, if the selected avail-
able static pressure is 150 Pa or below. KT = 1 (No recovery of the dynamic pressure).
Caution : When attaching supply ductwork to con-
denser inlet, ensure no fasteners pierce the coil.
Unit frame
1500 mm
15
Flex connection
Customer supplied
Duct work