Manual 2100-425
Page 7

WALL MOUNTING INFORMATION

1. Two holes, for the supply and return air openings,
must be cut through the wall as shown in Figure 3.
2. On wood-frame walls, the wall construction must
be strong and rigid enough to carry the weight of
the unit without transmitting any unit vibration.
See Figures 4 and 5.

INSTALLA TION INSTRUCTIONS

4. Mount bottom mounting bracket.
5. Hook top rain flashing under back bend of top.
Top rain flashing is shipped secured to the right
side of the back.
6. Position unit in opening and secure with 5/16 lag
bolts; use 7/8 inch diameter flat washers on the lag
bolts.
7. Secure rain flashing to wall and caulk across entire
length of top. See Figure 3.
8. For additional mounting rigidity, the return air and
supply air frames or collars can be drilled and
screwed or welded to the structural wall itself
(depending upon wall construction). Be sure to
observe required clearance if combustible wall.
9. On side by side installations, maintain a minimum
of 20 inches clearance on right side to allow access
to heat strips and control panel and to allow proper
airflow to the outdoor coil. Additional clearance
may be required to meet local or national codes.

TYPICAL INSTALLATIONS

See Figure 6 for common ways to install the wall-
mount unit.

WIRING — MAIN POWER

Refer to the unit rating plate for wire sizing
information and maximum fuse or “HACR" type
circuit breaker size. Each outdoor unit is marked with
a “Minimum Circuit Ampacity”. This means that the
field wiring used must be sized to carry that amount of
current. Depending on the installed KW of electric
heat, there may be two field power circuits required. If
this is the case, the unit serial plate will so indicate. All
models are suitable only for connection with copper
wire. Each unit and/or wiring diagram will be marked
“Use Copper Conductors Only”. These instructions
must be adhered to. Refer to the National Electrical
Code (NEC) for complete current carrying capacity
data on the various insulation grades of wiring
material. All wiring must conform to NEC and all
local codes.
The electrical data lists fuse and wire sizes (75ºC
copper) for all models, including the most commonly
used heater sizes. Also shown are the number of field
power circuits required for the various models with
heaters.
3. Concrete block walls must be thoroughly inspected
to insure that they are capable of carrying the
weight of the installing unit. See Figure 4.

MOUNTING THE UNIT

1. These units are secured by wall mounting brackets
which secure the unit to the outside wall surface at
both sides. A bottom mounting bracket is provided
for ease of installation.
2. The unit itself is suitable for “0” inch clearance,
but the supply air duct flange and the first 3 feet of
supply air duct require a minimum of 1/4 inch
clearance to combustible material. If a combustible
wall, use a minimum of 30-1/2" x 10-1/2"
dimensions for sizing. However, it is generally
recommended that a 1 inch clearance is used for
ease of installation and maintaining the required
clearance to combustible material. The supply air
opening would then be 32" x 12". See
Figures 3, 4 and 7 for details.
3. Locate and mark lag bolt locations and bottom
mounting bracket location. See Figure 4.
WARNING
Fire hazard can result if 1/4 inch clearance to
combustible materials for supply air duct is
not maintained. See Figure 3.
WARNING
Failure to provide the 1/4 inch clearance
between the supply duct and a combustible
surface for the first 3 feet of duct can result in
fire.