Ductwork - Daikin RoofPak RPS Series Installation And Maintenance Manual

Ductwork

Installing Ductwork
Mold can cause personal injury. Materials such as gypsum
wall board can promote mold growth when damp. Such
materials must be protected from moisture that can enter
units during maintenance or normal operation.
Installer must provide access in the ductwork for plenum-
mounted controls.
Once duct work is installed in units with side discharge,
access to plenum-mounted components is difficult.
On bottom-supply/bottom-return units, if a Daikin roof curb
is not used, the installing contractor should make an airtight
connection by attaching field-fabricated duct collars to the
bottom surface of either the roof curb's duct flange or the unit's
duct opening. Do not support the total weight of the ductwork
from the unit or these duct flanges. See
Units with optional back return, side discharge, or end discharge
(on RFS units), all have duct collars provided. To expose the
discharge duct collars on a side discharge unit, remove the
plenum section access door and the door gasketing.
Figure 64: Installing Ductwork
U n i t D u c t O p e n i n g
C o n n e c t o r
www.DaikinApplied.com
WARNING
NOTICE
Figure 64.
9 . 7 6 "
4 . 5 8 "
F l e x i b l e
D u c t F l a n g e r
D u c t w o r k
i n R o o f C u r b
Use flexible connections between the unit and ductwork to
avoid transmission of vibration from the unit to the structure.To
minimize losses and sound transmission, design duct work per
ASHRAE and SMACNA recommendations.
To minimize losses and sound transmission, design duct work
per ASHRAE and SMACNA recommendations.
Ductwork exposed to outdoor conditions must be built in
accordance with ASHRAE and SMACNA recommendations
and local building code.
Table 18: Rated Airflow
Unit AHRI
015
017
020
026
030
035
040
050
U n i t B a s e
R o o f C u r b
47 IM 926-3 • ROOFPAK APPLIED SYSTEMS
Mechanical Installation
Rated Airflow
3750
4375
5000
6875
7500
8750
10000
12500