Step 8 - Make Duct Connections; Step 9 - Install Mixing Box - Carrier AirStream 42BHE06 Installation, Start-Up And Service Instructions Manual

Step 8 — Make Duct Connections
Install all ductwork to and from unit in accordance with all appli-
cable codes. Duct construction must allow unit to operate within
the limits of the unit external static pressure as shown on job sub-
mittals.
Units designed to operate with ductwork may be damaged if oper-
ated without the intended ductwork attached. Units configured to
bring in outside air should have some method of low temperature
protection to prevent coil freeze-up.
Insulate all ductwork as required. Use flexible connections to min-
imize duct-to-duct alignment problems and noise transmission
where specified. Acoustic lining of main supply and return duct
should be considered for noise control. Noise transmission will be
reduced when return grilles are located as far as possible from the
unit.
Install ductwork, accessory grilles, and plenums so that they do
not restrict access to filter.
NOTE: Prevent dirt, dust, and debris from settling in unit.
Step 9 — Install Mixing Box
Mixing boxes are preassembled from the factory. A linkage kit
consisting of 2 crankarms, 2 swivels, and either a 25-in. (635.00
mm) (unit sizes 06-16) or a 34-in. (863.60 mm) (unit sizes 20-40)
length of 5/16-in. (7.94 mm) rod is provided for field installation
of the actuator.
To install the mixing box:
1. Assemble the mixing box base rails using the provided
hardware. The base rails are marked with identifying let-
ters. See Fig. 15.
2. Place unit on the base rails. Install mixing box and attach
to base rails using the no. 8 x 1/2 in. fasteners at the loca-
tions shown in Fig. 16 (42BHE units) or Fig. 17 (42BVE
SEE DETAIL A
MOUNTING
LOCATION
DETAIL A
Fig. 16 — Install Mixing Box - 42BHE Units
units). See Fig. 18 and 19 for base rail and mixing box
details.
3. Seal the connection between the mixing box and the return
duct flange.
NOTE: Be careful not to tape or seal the filter access panel.
Fig. 15 — Assemble Base
SEE DETAIL B
MOUNTING
LOCATION
DETAIL B
16