LIMITATIONS
These units must be wired and installed in accordance with all
national and local safety codes.
Voltage limits are as follows:
Air flow must be within the minimum and maximum limits ap-
proved for electric heat, evaporator coils and outdoor units.
CLEARANCE
Clearance must be provided for:
1. Refrigerant piping and connections - minimum 12"
recommended.
2. Maintenance and servicing access - minimum 36" from front
of unit recommended for blower motor / coil replacement.
3. Condensate drain line.
4. Filter removal - minimum 36" recommended.
LOCATION
Location is usually predetermined. Check with owner’s or dealer’s
installation plans. If location has not been decided, consider the
following in choosing a suitable location:
1. Select a location with adequate structural support, space for
service access, clearance for air return and supply duct
connections.
2. Normal operating sound levels may be objectionable if the air
handler is placed directly over some rooms such as bed-
rooms, study, etc. A flexible duct collar is recommended as
shown in Figure 2 to minimize noise.
3. Precautions should be taken to locate the unit and ductwork
so that supply air does not short circuit to the return air.
4. If evaporator coil is used, locate to permit installation of a
trapped condensate line to an open drain.
5. When an evaporator coil is installed in an attic or above a
finished ceiling, an auxiliary drain pan should be provided
under the coil as is specified by most local building codes.
If the coil is provided with a secondary drain it should be
trapped and piped to a location that will give the occupant a
visual warning that the primary drain is clogged. If the secon-
dary drain is not used it must be capped.
6. If unit is located in an area of high humidity, ie. an uncondi-
tioned garage or attic, nuisance sweating of casing may
occur. On these installations a wrap of 2" fiberglass insulation
with vinyl vapor barrier should be used.
7. Proper electrical supply must be available.
8. Clearances must also be taken into consideration, and pro-
vided for as follows:
a. Maintenance and servicing thru the front or access side of
unit with both sides and rear of unit having zero inch
clearance.
b. When no electric heat is used, the unit as well as all duct
work and plenum are designed for zero clearance to
combustible material.
c. If electric heat is used or anticipated, be sure a minimum
clearance of one inch is allowed on all sides of the supply
FLEXIBLE
DUCT
COLLAR
MINIMUM CLEARANCE
OF 1" ALL SIDES
3’
FIGURE 2 - Duct Clearance
FIGURE 3 - Typical Wiring and Piping
Air Handler
Voltage
*Normal Operating
Voltage Range
208/230 (06)
187-253
*Utilization range “A” in accordance with ARI Std. 110.
Entering Air Temperature Limits
Wet Bulb Temp.
°
F
Dry Bulb Temp.
°
F
MIN.
MAX.
MIN.
MAX.
57
72
65
95
535.03-N1Y
2
Unitary Products Group
