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Air handler configuration

These air handler units are supplied ready to install in an upflow or
horizontal left position. See 

Figure 3

. If the unit requires either downflow or

horizontal right airflow configurations, the unit must have the coil assembly
repositioned. See 

Downflow or horizontal right conversion

.

 

Downflow or horizontal right conversion

1.

Remove the coil access panel.

2.

Slide the coil and drain pan assembly out of the air handler.

3.

Turn the air handler cabinet upside down (downflow position).

4.

If installing the unit in a horizontal right position, the following models
require installation of a horizontal baffle plate shipped with the unit:
C48G and C60H. The horizontal baffle plate must be secured to the
coil delta plates. See 

Installing a horizontal baffle plate.

5.

Slide the coil back into the cabinet.

6.

Install the coil access panel. Conversion is now complete.

Installing a horizontal baffle plate

1.

With the coil removed from the air handling unit and laying on its hor-
izontal drain pan, locate the pre-drilled holes in the front and rear coil
delta plates.

2.

Insert the horizontal baffle plate into the end of the coil. Insert one end of
the horizontal baffle plate into the top side of the primary drain pan as
shown in 

Figure 5

 in the 

Installation Manual

.

3.

Secure the horizontal baffle plate in place with two screws, one in the
front delta plate and one in the rear delta plate.

Horizontal left applications (all models)

Air handling units are supplied ready to install in a horizontal left position.
A horizontal drain pan is factory installed. Refer to the 

Installation Manual

for further installation instructions.

Positioning the unit in horizontal applications

Set the unit so that it is sloped 1/4 in. towards the drain line connection.

Horizontal suspension

These air handlers may be suspended in horizontal applications. Use
angle steel support brackets with minimum 3/8 in. threaded rods,
supporting the unit from the bottom. Attach the threaded rods at the
locations shown in 

Figure 4

, leaving enough clearance between the door

and the rod so that doors can be removed for service.

Figure 3:  

Typical installation

NOTICE

Convert the air handler to the desired orientation prior to installation.
Conversion must be made before brazing the refrigerant connections
to the coil.

NOTICE

These models are shipped with a horizontal baffle plate. Remove and
retain this plate for horizontal right application. Discard for all other
applications.

A1701-001

Upflow

Downflow

Horizontal right

Horizontal left

Heat kit

Heat kit

Heat kit

Heat kit

 CAUTION

Do not lift the air handler by the cabinet brace. The cabinet brace is
held in place by the coil channel. The cabinet brace could become
disengaged from the cabinet causing the air handler to fall, potentially
causing injury or damaging property. Refer to 

Figure 1

 in the 

Installa-

tion Manual

 for the location of the cabinet braces.

NOTICE

When assembling the support structure, size to provide clearance for
access door removal. 

Figure 4:  

Suspension support locations

Table 4: 

Horizontal suspension dimensions

Air handler cabinet size

X (in.)

H (in.)

B18B

21 3/4

47

B24C/B30D/B36D

21 3/4

49 5/8

C36D

21 3/4

51

C42F

21 3/4

57

C48G/D48G/D60J

21 3/4

61 1/4

C60H/D60H

21 3/4

63

!

A1695-001

2 in.

1 1/2 in.

H

1 1/2 in.

1 1/2 in.

H

X

X

Minimum 1 1/2 in. x 1 1/2 in. 
(Angle recommended length 26 
in. minimum with 2 in. clearance 
on both sides of the air handler) 

Minimum 3/8 in. 
threaded rod 

Minimum 1 1/2 in. x 1 1/2 in. 
(Angle recommended length 26 
in. minimum with 2 in. clearance 
on both sides of the air handler) 

Minimum 3/8 in. 
threaded rod 

This document does not replace the Installation Manual

,

 which must be referred to for detailed information.

Notes: 

1.

The controls may require correct polarity on the power supply and a adequate ground.

2.

These units are rated for use with single and three phase 208 V or 230 V supply power.

3.

Use flexible duct connectors.

4.

Supply air ductwork must remain the size of the supply opening for the first 12 in. before transition to the correct duct size.

5.

The return and supply duct may be fastened to the bottom or sides of the air handler using screws no longer than 1/2 in..

6.

Line voltage electrical knockouts are available on the left top and left casing side. Refer to the 

Installation Manual

 for information on correct sizing

of overcurrent protection and supply wire sizes.

7.

Low voltage electrical knockouts are available on the right top and right casing side.

8.

Seal electrical openings and duct connections to prevent air infiltration. 

9.

If installing the air handler above a finished ceiling, use a secondary drain pan.

10. It is necessary to trap condensate drain pans and slope them toward the drain.

A1694-001

Blower compartment

Coil compartment

C

15 in.

1 1/2 in.

Filter access

B

20 1/2 in.

21 7/16 in.

Drain connections for upflow applications

Refrigerant connections

G

F

A

Service 
disconnect panel

Top outlet
dimensions

E

12 3/16 in.

18 5/8 in.

D

Bottom inlet 
dimensions

Figure 1:  

Dimensions

Table 1: 

Dimensions

1

Models

Dimensions

Wiring knockouts

2

Refrigerant 

connections line size

A

B

C

D

E

F

G

Height (in.) Width (in.)

Opening widths (in.)

Power (in.)

Control (in.)

Liquid (in.)

Vapor (in.)

RFC

B18B

XEMP2S1

47

17 1/2

7 1/2

16 1/2

16 1/2

7/8 (1/2)
1 3/8 (1)

1 23/32 (1 1/4)

7/8 (1/2)

3/8

3/4

RFC

B24C

XEMP2N1

49 5/8

17 1/2

10

16 1/2

16 1/2

RFC

B30D

XEMP2N1

49 5/8

17 1/2

10

16 1/2

16 1/2

RFC

B36D

XEMP2N1

49 5/8

17 1/2

10

16 1/2

16 1/2

RFC

C36D

XEMP2N1

51

21

11 1/2

20

20

RFC

C42F

XEMP2N1

57

21

17 1/2

20

20

7/8

RFC

C48G

XEMP2N1

61 1/4

21

21 3/4

20

20

RFC

D48G

XEMP2N1

61 1/4

24 1/2

21 3/4

23 1/2

23 1/2

RFC

C60H

XEMP2N1

63

21

23 1/2

20

20

RFC

D60H

XEMP2N1

63

24 1/2

23 1/2

23 1/2

23 1/2

RFC

D60J

XEMP2N1

61 1/4

24 1/2

21 3/4

23 1/2

23 1/2

1. All dimensions are in inches.
2. Actual size (conduit size)

Subject to change without notice. Published in U.S.A.

6112629-URG-A-1021

Copyright © 2021 by Johnson Controls, Inc. All rights reserved.

Supersedes: None

York International Corp. 

5005 York Drive 

Norman, OK 73069

Quick Reference Guide

Single-piece ECM multi-position 

residential air handlers

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