5
• Caulk and bolt standing seam and install the roof cleat.
• Check all splits to ensure proper bolting and caulking.
• Check all splits to ensure that all electrical and piping
connections are correct and complete.
Reassembly
of
Stacked
Unit
Horizontal
Splits —
For a unit is split both vertically and horizontally,
complete the assembly of the lower section first. Next join the
upper sections to the lower sections.
• Caulk underneath clips, behind lifting lugs, and behind
upper base channel.
• Wherever possible, secure base anchor clips in bolt
holes.
• Check all splits to ensure proper bolting and caulking.
• Check all splits to ensure that all electrical and piping
connections are correct and complete.
• If equipment is not properly installed, the cabinet will
leak air under pressure or water may leak into the cabinet
from the split joint.
For units wider than any split section’s airway length, re-
movable lifting lugs are provided along the width of unit. After
closely positioning the split, remove the inner lifting lugs.
During final bolting, a come-along or hand-operated winch can
be used to tighten the space between unit sections.
Trapping Drains —
All condensate drain connections
and floor drains must be trapped on the job site by others. Im-
proper drain trapping can cause the drain pan to flood and po-
tentially damage the air-handling unit and surrounding facili-
ties. Improperly trapping a drain can result in a flooded drain
pan and potential water damage to the unit and other building
facilities.
See Fig. 9 for condensate drain trap sizing.
Connecting Ducts —
When connecting flanged ducts
directly to the casing, use self-tapping sheet metal screws. For
duct connections to collar-type openings, use s-cleats or over-
lapping joints. To prevent air leakage and eliminate system per-
formance problems, caulk around all duct connections to form
tight seals.
Connecting Rain Hoods —
Be sure to allow adequate
clearance to doors and other openings on the unit. Use sheet
metal screws to fasten the hood or hoods to the casing of the air
handling units. Caulk around the hood flange, then carefully re-
move any excess caulking.
Electrical Installation —
All wiring shall be installed
in accordance with the requirements of the authorities having
jurisdiction. Do not cut holes in the bottom of outdoor units, as
the bottom of the unit has been made waterproof. Both field
wiring and internal wiring diagrams are included in the control
cabinet of the unit. The power requirements are indicated on
the unit nameplate. Where field wiring of the control circuit is
required, take care to size the field wiring for a maximum 10%
voltage drop. The VA rating of the transformer can be
assumed to be the maximum load. The disconnect must be
mounted properly and adequately grounded. All field wiring
outside the electrical enclosure must be rigid or flexible con-
duit. Reconnect all disconnected wiring on the units that were
split in 2 or more sections for shipment.
Observe the following precautions:
• When connecting a power supply to a three-phase motor,
take care that the three-phase wiring provides the correct
motor and blower rotation.
• Replacement wiring must be equivalent to original wire
size.
• It is recommended that, when interior lighting and con-
venience outlets are provided, they should be wired to a
separate power supply.
• In all cases the unit must be properly grounded and all
electrical connections should be checked and tightened if
required before starting up the equipment.
• See field-wiring diagram for requirements for shielded or
twisted wire for solid-state devices.
• When cutting holes in the control panel or unit for con-
duit penetration, make sure conduit penetrations are
sealed to be air and water tight.
• Lock all latches on the electrical and control panels.
CAULKING
a39-4467
Fig. 7 — Caulking Roof Exterior Seams
a39-4466
Fig. 8 — Bolt Standing Seam, Install Roof Cleat
