McQuay IM 672-3
1
General Information
Vision
TM
air handlers are not designed to be weather resistant.
Do not install them outdoors.
The system design and installation must follow accepted industry
practice as described in the ASHRAE Handbook, the National
Electric Code, and other applicable standards. This equipment
must be installed in accordance with regulations of authorities
having jurisdiction and all
applicable codes.
Installation and maintenance must be performed by qualified
personnel familiar with applicable codes and regulations and
experienced with this type of equipment. Sheet metal parts,
self
-
tapping screws, clips, and such items inherently have sharp
edges; the installer should exercise caution.
Receiving and Handling
1
Carefully check items against the bills of lading to verify
all crates and cartons have been received. Carefully inspect
all units for shipping damage. Report damage immediately
to the carrier and file a claim.
2
Vision air handler units are constructed of galvanized or
painted steel and are inspected thoroughly before leaving
the factory. Take care during installation to prevent
damage to units.
3
Take special care when handling the blower section. All
fans are dynamically balanced before leaving the factory.
Rough handling can cause misalignment or a damaged
bearings or shaft. Carefully inspect fans and shaft before
unit installation to verify this has not happened.
4
Handle the zone damper of the multi-zone units with
special care. Zone dampers are set and inspected before
leaving the factory, but should be checked on arrival to the
job to verify the bell arm and connecting rod set screws did
not become loose in shipment.
Screws, bolts, etc., for assembling sections are supplied in a
bag attached to each section. All necessary gasketing is
applied in the factory for section-to-section mounting.
Unit Storage
Store unit on a level surface. If air handling units are stored
for any period of time, periodically rotate the fan wheel to
prevent permanent distortion of drive components. In
addition, grease may settle in the lower part of the bearing,
which can lead to oxidation on the upper portion of the
bearing surface. Keep the fan bearings lubricated.
Nomenclature
CAUTION
SHARP EDGES AND COIL SURFACES
are a potential injury hazard. Avoid contact with them.
ATTENTION
Les bords tranchants et les surfaces des bobines sont un
risque de blessure. Ne les touchez pas.
CAH
003 G
D
A C
Model
CAH = Custom modular air handler
CAC = Custom modular component
Nominal unit size
(cataloged size—nominal square foot of coil)
003, 004, 006, 008, 010, 012, 014, 017,
021, 025, 030, 035, 040, 050, 065, 080, 085, 090
Vintage of McQuay air handling unit
Unit cross section
C = Standard unit cross section
M = Custom size cross section
Motor location
A = Motor along side of fan housing
D = Motor down stream of belt drive
plenum fan
F = Motor on inline fan
G = Motor downstream of direct drive
plenum fan
T = Motor behind twin fan housing
Unit type/coil position
B = Blow-through cooling coil location
D = Draw-through cooling coil location
H = Heating only
V = Vent only
M = Multizone
