ENCLOSURE
HX, CDXQ, CDX-HW
INSTALLATION INSTRUCTIONS
**WARNING TO INSTALLER, SERVICE PERSONNEL AND OWNER**
Altering the product or replacing parts with non authorized factory parts voids all warranty or implied war-
ranty and may result in adverse operational performance and/or a possible hazardous safety condition to
service personnel and occupants. Company employees and/or contractors are not authorized to waive this
warning. Current Maintenance Program is available at www.fi rstco.com under “Product Information”.
GENERAL
The manufacturer assumes no responsibility for equipment installed
in violation of any code requirement.
These instructions give information
relative to the installation of these
enclosures only. For other related
equipment refer to the proper instructions.
Material in this shipment has been
inspected at the factory and released
to the transportation agency in good
condition. When received, a visual
inspection of all cartons should be
made immediately. Any evidence
of rough handling or apparent damage should be noted on the delivery
receipt and the material inspected
in the presence of the carrier’s
representative. If damage is found,
a claim should be fi led against the
carrier immediately.
Mounting
Fasteners
Figure 1
ENCLOSURE MOUNTING
The installer must adhere strictly to
all local and national code requirements pertaining to the installation of
this equipment. These enclosures
are designed to be installed in the
ceiling for horizontal mounting only.
Location of the unit must be in an
area providing adequate access to
the ceiling panel since all components must be serviced from this
area.
The enclosure should be lifted to
the desired location and secured
using the mounting holes located on
the top with an acceptable mounting
method (Figure 1). The enclosure
must be level in both directions to
permit proper drainage of the fan
coil.
After the enclosure is mounted a
2x2 or 2x4 frame must be installed
around the base of the enclosure
to create an air tight seal. Figure 7
shows a typical arrangement for the
framing required.
****** WARNING ******
Extreme caution must be
taken that no internal damage
will result if screws or holes
are drilled into the cabinet.
INSTALLING FAN COIL
UNIT INTO ENCLOSURE
1. Ensure that the enclosure has
been installed level.
2. Remove motor/blower assembly
from the fan coil.
3. Lift coil assembly into enclosure
and place the top fl ange of the coil
onto the top surface of the mounting angles at each end of the enclosure.
4. Slide coil assembly forward until
the supply duct fl anges of the fan
coil are fully engaged into the front
of the enclosure.
NOTE: Before fastening, the fan
coil unit must be fully engaged
into the supply duct fl ange. If not,
supply air may recirculate into
the enclosure. To ensure total
engagement, push the fan coil
unit forward. Total engagement
has occurred when the front of
the top plate and the front of the
drain pan are squeezing against
the insulation.
5. Fasten the coil assembly to the
L2556 07/06
fan coil with sheetmetal screws
through the slots in the mounting
angle.
6. Install motor/blower assembly.
7. Check to make sure that the fan
coil is level and that the drain pan
will drain properly.
****** WARNING ******
It is recommended that the
enclosure and fan coil be
protected (covered) during
the dry wall and painting process to prevent the spraying
of the material into the enclo-
sure and on the fan coil.
ENCLOSURE WITH FAN
COIL FACTORY MOUNTED
On larger units, installation may be
easier if the enclosure and unit are
mounted separately. Unit removal
is the reverse of the installation procedure above.
NOTE: Before mounting the enclosure check to see if the fan
coil unit is fully engaged into the
supply duct fl ange. Total engage-
ment is when the front of the top
plate and the front of the drain
pan are squeezing against the
insulation. Also check to make
certain that the fan coil unit is
secured fi rmly to the enclosure
with sheetmetal screws through
the mounting angle.
Refer to enclosure mounting instructions on page one.
CONNECTION OF AIR
DISTRIBUTION DUCTS
All duct work must be installed
in accordance with National Fire
Protection Association Codes 90A
and 90B. Since the return air to the
unit is through louvers in the ceiling
panel, applicable installation codes
may limit the unit to installation only
in single story residences.
The enclosure has supply duct
fl anges to accommodate the connection of a supply plenum, however extreme care must be taken to
insure proper fastening of the supply
plenum to the enclosure.
The fastening of the supply plenum
****** WARNING ******
The fan coil unit protrudes
approximately 1-1/2 inches
into the supply duct fl anges
on the enclosure. (Figure 5)
must be at least 1-3/4 inches away
from the front edge of the enclosure.
This prevents two problems: (1) If
the enclosure is mounted without
the fan coil installed and the duct
fasteners are too close to the front
edge it will not permit the fan coil to
engage completely. (2) If the enclosure and fan coil unit are mounted as
an assembly and the duct fasteners
are too close to the front edge they
may also secure the fl anges on the
fan coil unit preventing the removal
of the unit from the enclosure.
An optional return air cutout is supplied on the rear of the enclosure to
permit ducted return and is shown in
Figure 6. Rear entry ducted return
requires the use of a solid ceiling
panel.
ENTRY POINT
****** WARNING ******
The fasteners securing the
duct must be at least 1-3/4
inches away from the front
edge of the enclosure.
CONNECTIONS
For general reference the following
items are shown in Figure 6:
-optional return air plenum cutout
-entry points for connection to refrigerant lines, water coil, electrical
lines, and drain lines.
Refer to individual fan coil installation instruction for specifi c piping
and electrical wiring requirements.
3
Figure 3
6
2
Total Engagement
Figure 4
PLENUM AND UNIT FLANGE LOCATIONS
1-1/2” Fan Coil Flange
2-1/2” Enclosure Flange
Figure 5
1-3/4” Minimum Fastener Location - Ple-
CONNECTION LOCATIONS
Drain Connections
Alternate Drain Connections
Water Coil Connections
Optional Return Air Cutout
Refrigerant Line Connections
Water Coil Connections
Electrical Connections
Water Coil Connections
Figure 6
CEILING PANEL INSTALLATION
Ceiling panel assemblies are shipped seperate to
protect them from damage during shipping and installation.
Figures 7 and 8 show details of the ceiling panel frame installation.
INSTALLATION SUPPORT FRAMING
Ceiling
2” x 2” or 2” x 4”
Frame All Sides
Sheet Rock
Louvered Ceiling Panel
Note:
Unit must be located such that the 2” x 2” or 2” x 4” frame creates an air tight seal around unit.
Figure 7
CEILING PANEL FRAME INSTALLATION
2” x 2” or 2” x 4”
Frame
Sheet Rock
Screw
Ceiling Panel Frame
Figure 8
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