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Fig. 36 — CRBARHOD001A00 Hood Sides and Top
Caulk the backside of the mating flanges to ensure a watertight
seal. Install the CRBARHOD001A00 over the relief damper and
screw to the return duct, as illustrated in Fig. 35.
Step 10 — Economizer – Horizontal Airflow Units
The barometric relief damper ships attached to the exterior return
opening panel on the unit. See Fig. 37. Remove shipping cover to
access the barometric relief damper, rain angle, and parts bag.
These items are to be repositioned on the side of the field supplied
ductwork. In addition, the barometric relief hood should be used
and can be ordered separately (P/N CRBARHOD001A00) or can
be field supplied.
BAROMETRIC
RELIEF
DAMPER
SHIPPING
COVER
Fig. 37 — Barometric Relief Damper — Shipping
Location
Step 11 — Install External Condensate Trap/Line
The unit has one
/
-in. condensate drain connection on the end of
3
4
the condensate pan. See Fig. 38. See Fig. 4, 9, and 14, Item E in
the view labeled "BACK (HORIZONTAL DISCHARGE W/O
ECON)" for the location of the condensate drain connection.
Fig. 38 — Condensate Drain Pan Connection
The piping for the condensate drain and external trap can be com-
pleted after the unit is in place. Hand-tighten fittings to the drain
pan fitting. Provide adequate support for the drain line. Failure to
do so can result in damage to the drain pan. See Fig. 39.
MINIMUM PITCH
1" (25mm) PER
10' (3m) OF LINE
TO ROOF
DRAIN
RAIN ANGLE
NOTE: Trap should be deep enough to offset maximum unit static
Fig. 39 — Condensate Drain Pan Piping Details
All units must have an external trap for condensate drainage. In-
stall a trap at least 4-in. (102 mm) deep and protect against
freeze-up. If drain line is installed downstream from the external
trap, pitch the line away from the unit at 1-in. per 10 ft (25 mm
per 3 m) of run. Do not use a pipe size smaller than the unit con-
nection (
Step 12 — Make Electrical Connections
RETURN
OPENING
ELECTRIC SHOCK HAZARD
PANEL
Failure to follow this warning could result in personal injury or
death.
Unit cabinet must have an uninterrupted, unbroken electrical
ground to minimize the possibility of personal injury if an
electrical fault should occur. This ground may consist of
electrical wire connected to unit ground lug in control
compartment, or conduit approved for electrical ground when
installed in accordance with NEC; ANSI/NFPA 70, latest
edition (in Canada, Canadian Electrical Code CSA [Canadian
Standards Association] C22.1), and local electrical codes.
NOTE: Field-supplied wiring shall conform with the limitations
of minimum 63°F (33°C) rise.
28
CONDENSATE
DRAIN
CONNECTION
BASE RAIL
3 in. (76 mm)
MIN
OPEN
VENT
DRAIN PLUG
difference. A 4-in. (102 mm) trap is recommended.
3
/
-in.).
4
WARNING
SEE NOTE
ROOF
CURB
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