Filter Installation; Opening The Collapsed Exhaust Damper Hood - Trane Horizon OABD Series Installation, Operation And Maintenance Manual

Table 9. Chilled water pipe chase location (in.)
Unit A B
OAB 61.25 12.00
OAG 79.75 12.50
OAK 63.84 19.50
OAND 93.93 20.64
OAD 64.25 30.00
OANG 92.64 30.00
Table 10. Chilled water connection size (MPT-in.)
Unit Size
OAB 3–9 tons
OAG 10–30 tons
OAK 12–30 tons
OAND 30-60 tons
OAD, 4-row
OAD, 6-row
OANG, 4-row
OANG, 6-row

Filter Installation

The filter rack is accessible through the evaporator coil
compartment door. Filter type, size, and quantity are
determined by selected filter option and unit size.
Note: Do not operate the unit without filters.
Opening the Collapsed Exhaust Damper
Hood
The drawings shown in this section are for one cabinet. Other
cabinets may have a different appearance, but the process
remains the same.
1. To release the damper hood, remove the hex head sheet
metal screws (one per side) shown in DETAIL A (see
Figure 120) and marked by arrow (1).
OAU-SVX007A-EN
C D E
10.00 3.00 3.000
10.00 3.00 4.125
11.00 5.00 NA
11.00 5.00 NA
18.00 3.50 NA
18.00 2.81 NA
MPT-in.
2.0
2.0
2.5
3.0
1.5
2.0
2.5
3.0
Figure 120. Powered exhaust damper hood, collapsed
2. Lift the hood upward and rotate the side panels outward
while holding the top up.
3. As shown in DETAIL B (see
arrow (2), secure the side panels to the top of the hood
using (8) hex head sheet metal screws, provided with the
unit, through the pre-punched holes in the top and side
panels (four screws per side).
4. Repeat these steps for the remaining damper hood, if
applicable.
Installation
Figure 121) and marked by
77