Yumpu YCP024F1L-M Installation Operation & Maintenance page 12

DUCTWORK
ATTACHING DOWNFLOW DUCTWORKTO ROOF CURB
Supply and return air flanges are provided on the roof curb for easy
duct installation. All ductwork must be run and attached to the curb
before the unit is set into place.
Follow these guidelines for ductwork construction:
Connections to the unit should be made with three-inch canvas
connectors to minimize noise and vibration transmission.
Elbows with turning vanes or splitters are recommended to mini-
mize air noise and resistance.
The first elbow in the ductwork leaving the unit should be no closer
than two feet from the unit, to minimize noise and resistance.
AIR PROOF
ATTACHING HORIZONTAL DUCTWORK TO UNIT
All conditioned air ductwork should be insulated to minimize heating
and cooling duct losses. Use a minimum of two (2) inches of
insulation with a vapor barrier. The outside ductwork must be
weatherproofed between the unit and the building.
When attaching ductwork to a horizontal unit, provide a flexible
watertight connection to prevent noise transmission from the unit to
the ducts. The flexible connection must be indoors and made out
of heavy canvas.
NOTE: Do not draw the canvas taut between the solid ducts, i
_UNIT EXTERIOR
/ II
WEATHERPROOF
lb.. F,ELD jc";S S EAM
THIS SEAM
BASE
ooc,\
FLANGE
AIR PROOF
THIS SEAM
FLANGE
UNIT BASE
FIELD DUCT
/ AIR PROOF
THIS SEAM
FIELDDucT _J_'_ _ITBASE
L_ UNIT DUCT FLANGE
UNIT DUCT
FLANGE
NOT RECOMMENDED
UNIT BASE
WITH BUTYL OR
SILICONE
FIELD DUCT
DOWNFLOW
T EXTERIOR
II _ UNIT DUCT FLANGE
lk WEATHERPROOF
J_ _ THIS SEAM
FIELD DUCT
HORIZONTAL
The following warning complies with State of California law, Proposition 65.
LWARNING:
This product contains
fiberglass wool insulation! Fiberglass dust and ceramic
fibers are believed by the State of California to cause
cancer through inhalation. Glasswool fibers may also
cause respiratory, skin, or eye irritation.
PRECAUTIONARY MEASURES
• Avoid breathing fiberglass dust.
• Use a NIOSH approved dust/mist respirator.
• Avoid contact with the skin or eyes. Wear long-
sleeved, loose-fitting clothing, gloves, and eye
protection.
• Wash clothes separately from other clothing: rinse
washer thoroughly.
Operations such as sawing, blowing, tear-out, and
spraying may generate fiber concentrations requiring
additional respiratory protection. Use the appropriate
NIOSH approved respirator in these situations.
FIRST AID MEASURES
Eye Contact Flush eyes with water to remove dust.
If symptoms persist, seek medical
attention.
Skin Contact
Wash affected areas gently with soap
and warm water after handling.
Page 12 Dwg. No. X664209 P01