15
KOLDWAVE 3AK (AIRMASTER)
DUCT DESIGN
Condenser Duct
Should a longer, 12" diameter duct be needed on the
condenser discharge, 10 foot flexible ducts may be
coupled together up to a maximum equivalent length
of 100 feet. (Allow 6 feet for every 90° bend.)
The external static pressure (E.S.P.) at the condenser
discharge cannot exceed 0.25" of water. When
employing more than 50 feet of duct, the noise baffle,
located at the condenser discharge, should be
removed (see page 26 for removal procedure.) This
will prevent the unit from tripping on its high pressure
switch at high ambients.
Extended Evaporator Snozzles
®
Should 6" diameter snozzle
®
extensions be needed on
the evaporator discharge, 9.75 foot long wire-
reinforced flexible duct lengths may be coupled
together up to a maximum of 60 equivalent feet. (Allow
3 feet for every 90° bend.) The external static pressure
(E.S.P.) at the evaporator discharge cannot exceed
0.5" of water. Exceeding this will restrict airflow and trip
unit out on its freeze control.
Single 10" Diameter Evaporator Discharge Duct
On application where one large cold air supply duct is
desired, a mounting plate with a single 10" diameter
mounting flange is available, which mounts just as the
snozzle
®
plate. A 10 foot length of 10" diameter wire-
reinforced flexible duct can be clamped to it. Should a
longer duct be desired, 10 foot duct lengths can be
coupled together up to a maximum of 100 equivalent
feet. (Allow 6 feet for every 90° bend.) The external
static pressure at the evaporator discharge cannot
exceed 0.5" of water.
Duct Clamps
6", 10" and 12" diameter twin wire duct clamps are
used to secure the various flexible ducts to the unit
ceiling panel, evaporator discharge panel, snozzles,
and to duct couplers. These unique clamps provide a
secure, leak-free seal of the wire-reinforced duct to the
various sheet metal accessory items.
To use, position the duct over the accessory item and
slip the clamp around the duct. Then slide the hooked
end of the wire clamp between the two ends attached
to the screw assembly plate, slipping it behind the
retaining washer. Tighten the screw with a phillips
screwdriver to complete the installation. See illustration
below for further details.