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Blower
Compartment
Refrigerant
Connections
FIGURE 2: Dimensions & Duct Connection Dimensions
1
TABLE 1: Dimensions
Models
AHR18B/AHR24B/
AHR30B/AHR36B
AHR 42C
AHR48D/AHR60D
1. All dimensions are in inches.
2. Actual size (conduit size).
SECTION III: UNIT INSTALLATION
CLEARANCES
Clearances must be taken into consideration, and provided for as fol-
lows:
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 lines routed to clear filter and panel access.
4. Filter removal - minimum 36" recommended.
5. The ductwork and plenum connected to this unit are designed for
zero clearance to combustible materials.
6. A combustible floor base accessory is available for downflow appli-
cations of this unit, if required by local code.
LOCATION
Location is usually predetermined. Check with owner's or dealer's
installation plans. If location has not been decided, consider the follow-
ing 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. Use hanging brackets to wall mount this single piece air handler
unit, is not recommended.
Johnson Controls Unitary Products
J
K
D
Drain Connections
for Upflow
Applications
7-11/32"
1-1/2"
B
Filter
Access
Dimensions
A
B
C
Height
Width
Depth
46
17 1/2
21 1/2
52
21
57
24 1/2
13"
A
Circuit Breaker
18-9/32"
C
Drain Pan Connections
for Horizontal Applications
D
E
F
16 1/2
13-29/32
16 1/2
21 1/2
17-13/32
20
26
20-29/32
23-1/2
3. Normal operating sound levels may be objectionable if the air han-
dler is placed directly over some rooms such as bedrooms, study,
etc.
4. Select a location that will permit installation of condensate line to an
open drain or outdoors allowing condensate to drain away from
structure.
The primary and secondary drain line must be trapped to allow proper
drainage of condensate water. If the secondary drain line is not used,
it must be capped.
The coil is provided with a secondary drain. It should be piped to a loca-
tion that will give the occupant a visual warning that the primary drain is
clogged. If the secondary drain is not used it must be capped.
5. When an evaporator coil is installed in an attic or above a finished
ceiling, an auxiliary drain pan should be provided under the air han-
dler as is specified by most local building codes.
6. Proper electrical supply must be available.
7. If unit is located in an area of high humidity (i.e. an unconditioned
garage or attic), nuisance sweating of casing may occur. On these
installations, unit duct connections and other openings should be
properly sealed, and a wrap of 2" fiberglass insulation with vinyl
vapor barrier should be used.
661693-UIM-E-1212
F
Top Outlet
Dimensions
Panel
E
Bottom Inlet
Dimensions
2
Wiring Knockouts
J
K
Power
Control
7/8 (1/2)
1-3/8(1)
7/8 (1/2)
1-23/32 (1-1/4)
NOTICE
Refrigerant
Connections
Line Size
Liquid
Vapor
3/4
3/8
7/8
3
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