CACG/CAHG/CAHJ & CACH/CAHH/CAHK
Air Handlers
• Installation, Operation and Maintenance Manual •
Comfort where it counts
6
P/N 240008108, Rev. G [07/08/10]
Remote thermostat applications
CACG/CAHG/CAHJ units require a
•
wall thermostat for operation. CACH/
CAHH/CAHK units can be operated by
a wall thermostat by confi guring the unit’s
DIP switches.
A thermostat can be obtained through
•
EMI or your local distributor.
NOTICE
Make sure the thermostat is suitable for
unit operation (i.e., cooling only, cool-
ing/electric heat, heat pump.) See ther-
mostat requirements in this manual.
Mechanical characteristics
Filters
Metal framed fi lters are fi tt ed. Th
ese are
•
reusable and may be vacuum cleaned.
Condensate pump
A condensate pump is designed to carry
•
water out of the unit. Th
e pump is fi xed
to a mounting bracket which can be
withdrawn from the side of the chassis
and incorporates an inspection hole to
allow a visual check of the pump during
operation. A fl oat switch stops the cool-
ing action (shuts off the compressor)
should the pump become blocked or fail.
(Important: Total lift for this pump is 36”
(0.9 m) or less.)
Air vanes
Air outlet vanes are manually adjustable
•
on the models 9 and 12 or driven by an
electric motor on the models 24 and 36.
Where fi tt ed, the motorized air vanes can
•
be set to auto sweep or can be stopped in
a fi xed position.
Heating
Th
e cassett e may be fi tt ed with electric
•
heaters which are equipped with over-
temperature limit switches. Consult
factory for available models with electric
heat.
Fresh air connection
Fresh air may be introduced to the unit
•
by the addition of ducts connected to the
fresh air knockouts on the cassett e case.
Recommended maximum length is 10’
•
(3m) of 4” (0.1m) diameter duct. Th
e
fresh air volume is approximately 7–10%
of the unit’s published maximum air fl ow
(if more than 10% make up air is needed,
a fresh air booster fan is required).
Refer to Performance Data section of this
•
manual for further information.
Th
e cassett e is best installed in new con-
•
struction or existing construction with a
suspended or false ceiling with enough
clearance to accommodate concealing
the piping and electrical connections to
the unit.
Verify Unit Before Installing
(continued)