010-200002-000
Page 18
HB IOM 1.1 2-13-2014
Mixing Box Air Sensor
MIXING BOX MIXED AIR SENSOR BRACKET
AS-
SEMBLY — To assemble the mixed air sensor bracket
assembly to the mixing box, attach mixed air sensor to
mixed air sensor bracket. See Fig. 14.
Fig. 14 — Mixed Air Sensor Bracket
MIXED AND OUTSIDE AIR SENSORS INSTALLATION
1.
Remove access panel and filters as needed.
2.
Place mixed air sensor assembly in airstream as
shown in Fig. 15.
3.
Attach to top of unit with self drilling screws.
4.
Drill or knockout 1/2 in. hole into top of mixing box
close to actuator as shown in Fig. 15.
5.
Insert snap bushing in hole. Run wires inside unit,
along top of mixing box, between the filter rail and in-
sulation, and attach to mixed air sensor.
6.
Place enthalpy sensor, shown in Fig. 16, in location
suitable to meet manufacturer's requirements.
7.
Connect all sensors to logic module per manufacturer's
instructions.
8.
Test to ensure proper function.
9.
Replace all parts and tape or fill any holes or gaps
made.
Fig. 15 — Mixed Air Sensor Installation
Mixing Box —
To install mixing box:
1.
Insert rear return duct flanges of unit
into opening of mixing box.
2.
Ensure all unit flanges are inside the
opening of the mixing box and screw a
minimum of three screws into each of
the unit’s four flanges using self-drilling
screws.
3.
The mixing box should now hang freely
from the unit (Figure 17). For HB sizes
30 and above, support back edge of
mixing box using Unistrut. Insure that
the support strut does not interfere with
the damper linkages.
4.
Remove unit filters from unit before
start-up.
Fig. 16 — Enthalpy Sensor
Fig. 17 — Installing Mixing Box
