Carrier 42C Users Manual 42 3si

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42C,D,S,V Series
Fan Coil Air Conditioners

Installation, Start-Up and Service
Instructions
CONTENTS

SAFETY CONSIDERATIONS

Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
PHYSICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
PRE-INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . 3-39
Unpack and Inspect Units . . . . . . . . . . . . . . . . . . . . . . . . 3
Protect Units From Damage . . . . . . . . . . . . . . . . . . . . . . 3
Prepare Jobsite for Unit Installation . . . . . . . . . . . . . . 3
Identify and Prepare Units. . . . . . . . . . . . . . . . . . . . . . . . 3
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40-67
Step 1 — Place Units in Position . . . . . . . . . . . . . . . . 40
• 42C UNITS
• 42V UNITS
• 42D UNITS
• 42S UNITS
Step 2 — Make Piping Connections . . . . . . . . . . . . . 42
• VALVE PACKAGES
• 42C,D,V DRAIN CONNECTIONS
• 42C,D,V WATER SUPPLY/RETURN
CONNECTIONS
• 42C,D,V STEAM CONNECTIONS
• 42C,D,V DIRECT EXPANSION (DX) REFRIGERANT
PIPING
• TEST AND INSULATE
Step 3 — Make Electrical Connections . . . . . . . . . . 55
• STANDARD WIRING PACKAGES
Step 4 — Make Duct Connections . . . . . . . . . . . . . . . 66
Step 5 — Frame and Finish Unit. . . . . . . . . . . . . . . . . 66
Step 6 — Cut out Openings for Grilles and
Thermostats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Step 7 — Make Final Preparations. . . . . . . . . . . . . . . 67
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67,68
Excessive Condensation on Unit . . . . . . . . . . . . . . . . 67
To Clean Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Coil Air Vent (Manual or Automatic) . . . . . . . . . . . . . 67
Check Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Fan Motor Bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Clean Fan Wheel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Clean Electric Heater. . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Clean or Replace Air Filters . . . . . . . . . . . . . . . . . . . . . 68
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
START-UP CHECKLIST FOR 42C,D,S,V SERIES
FAN COIL AIR CONDITIONERS. . . . . . . . CL-1, CL-2

Installation of this unit can be hazardous due to electrical components and equipment location (such as a ceiling or elevated
structure). Only trained, qualified installers and service
mechanics should install and service this equipment.
When installing this unit, observe precautions in the literature,
labels attached to the equipment, and any other safety precautions that apply.
• Follow all safety codes.
• Wear safety glasses and work gloves.
• Use care in handling and installing this accessory.

WARNING
ELECTRIC SHOCK HAZARD To avoid the possibility of
electrical shock, open and tag all service switches before
installing this equipment.

INTRODUCTION
This document contains general installation instructions for
the 42C,D,S,V unit fan coils. Refer to the unit-wiring diagram
installed on the blower housing or specific manufacturer literature for any other type of factory-mounted controls.
See drawings for unit configurations, dimensions, clearances,
and pipe connections. Refer to unit wiring label for all electrical
connections; follow NEC (National Electrical Code) and local
codes.

PHYSICAL DATA
Component weight data, shipping weights, and filter data of
the 42C,D,S,V units are provided in Tables 1-4.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53420004-01
Printed in U.S.A.
Form 42-3SI
Pg 1
12-09
Replaces: 42-2SI

Table 1 — Physical Data — 42C Series Units
UNIT SIZE 42C
NOMINAL AIRFLOW (cfm)
SHIPPING WEIGHT (lb)*
42CA
42CE
42CF
42CG
42CK
COIL WATER WEIGHT
(Approx lb per row of coil)
42CA, CE, CG, CK
42CF
COILS
FPI
Coil Face Area (sq ft)†
MOTOR (qty)
42C Series
BLOWER (qty)
42CA, CE, CG, CK
42CF
FILTERS
Nominal Size (in.) (1-in. thick)
42CA**
42CE††
42CF††***
42CG
Bottom Return
Rear Return
42CK
Bottom Return
Rear Return
Rear Return with Duct Collar
Qty
SUPPLY DUCT COLLAR
PIPING CONNECTIONS (Sweat) (in.)
Coil Outlet and Inlet
Drain Connection
Tell-Tale Drain

02
200

03
300

04
400

06
600

08
800

10
1000

12
1200

36
55
—
98
115

39
60
—
118
120

49
70
84
126
135

59
82
97
168
150

64
95
110
176
155

95
135
163
215
227

107
154
—
245
241

0.7
—

0.8
—

1.0
1.02

1.4
1.42

1.7
1.71

2.3
2.32

2.7
—

0.8

1.1

1.4

2.3

3.2

3.7

1

1

1

1

1

2

2

1
—

1
—

2
2

2
2

2
2

4
4

4
—

10 x 24
10 x 18
—

10 x 28
10 x 22
—

10 x 32
10 x 28
123/4 x 28

10 x 42
10 x 33
123/4 x 33

10 x 42
10 x 40
123/4 x 40

10 x 54
10 x 54
123/4 x 54

10 x 64
10 x 62
—

10 x 231/2
8 x 231/2

10 x 28
8 x 28

10 x 321/2
8 x 321/2

10 x 37
8 x 37

10 x 41
8 x 41

10 x 541/2
8 x 541/2

10 x 63
8 x 63

10 x 28
7 x 21
6 x 183/4
1

10 x 28
7 x 21
6 x 183/4
1

10 x 33
7 x 27
6 x 243/4
1

10 x 45
7 x 38
6 x 353/4
1
1-in.

10 x 45
7 x 38
6 x 353/4
1

10 x 62
7 x 52
6 x 493/4
1

10 x 62
7 x 52
6 x 493/4
1

10 fins/inch
1.9

5/
8
7/
8
5/
8

*Calculate operating weight of unit: shipping weight + coil water weight x
number of coil rows.
†42CF applies to sizes 04 to 10.
**Filter size for return-air grille location.

OD
OD
OD

††Filter size if located in return-air plenum.
***With electric heater and bottom return, the 42CF unit filter width increases
from 123/4 to 163/4.

Table 2 — Physical Data — 42V Series Units
UNIT SIZE 42V
NOMINAL AIRFLOW (cfm)
SHIPPING WEIGHT (lb)*
42VA
42VB
42VC
42VE
42VF
42VG
COIL WATER WEIGHT
(Approx lb per row of coil)
42VA, VB, VC†, VF
42VE
42VG
COILS
FPI
Coil Face Area (sq ft)
MOTOR (qty)
42VA, VB, VF
42VC, VE
42VG
BLOWER (qty)
42VA, VB, VF
42VC, VE
42VG
FILTERS
Nominal Size (in.) (1-in. thick)
42VA, VB, VF
42VC, VE
42VG
Qty
SUPPLY DUCT COLLAR
PIPING CONNECTIONS (Sweat) (in.)
Coil Outlet and Inlet
Drain Connection

01
150

02
200

03
300

04
400

06
600

08
800

10
1000

12
1200

—
—
—
—
—
40

65
89
50
72
92
—

80
95
60
100
98
74

90
116
72
108
122
—

112
134
110
154
141
—

115
137
—
—
144
—

140
169
—
—
178
—

170
192
—
—
205
—

—
—
0.4

0.7
0.9
—

0.8
1.2
1.0

1.0
1.6
—

1.4
2.3
—

1.7
—
—

2.3
—
—

2.7
—
—

0.8

0.8

1.1

1.4

12 fins/inch
1.9

2.3

3.2

3.7

—
—
1

1
1
—

1
1
2

1
1
—

1
2
—

1
—
—

2
—
—

2
—
—

—
—
1

1
2
—

1
2
2

2
2
—

2
4
—

2
—
—

4
—
—

4
—
—

—
—
10 x 141/2
1

73/4 x 213/4
7 x 213/4
—
1

73/4 x 253/4
7 x 263/4
10 x 28
1

73/4 x 313/4
7 x 343/4
—
1

73/4 x 433/4
—
—
1

73/4 x 573/4
—
—
1

73/4 x 653/4
—
—
1

73/4 x 413/4
7 x 483/4
—
1
1-in.

5/ OD
8
3/ MPT
4

*Calculate operating weight of unit: shipping weight + coil water weight x
number of coil rows.
†Available in sizes 02-06.

2

Table 3 — Physical Data — 42D Series Units
UNIT SIZE 42D
NOMINAL AIRFLOW (cfm)
SHIPPING WEIGHT (lb)*
42DA
42DC
42DD
42DE
42DF
COIL WATER WEIGHT
(Approx lb per row of coil)
COILS
FPI
Coil Face Area (sq ft)
MOTOR (qty)
BLOWER (qty)
FILTERS
Nominal Size (in.) (1-in. thick)
42DA
42DC
42DD
(Front Return)
(Bottom Return)
42DE
42DF
Qty

06
600

08
800

10
1000

12
1200

14
1400

16
1600

18
1800

20
2000

64
94
150
135
157

79
107
163
155
167

93
150
176
165
177

110
169
195
184
199

119
174
220
199
215

129
178
235
215
229

137
195
240
232
249

155
220
247
243
258

1.3

1.6

1.9

2.3

2.7

3.0

3.4

3.7

1.6
1
1

2.1
1
1

2.5
1
1

3.0
2
2

3.5
2
2

4.1
2
2

4.6
2
2

5.0
2
2

14 x 21

14 x 26

14 x 30

14 x 35

14 x 40

14 x 45

14 x 50

14 x 54

123/4 x 21
123/4 x 21
14 x 143/4
14 x 14

123/4 x 26
123/4 x 25
14 x 193/4
14 x 20

123/4 x 30
123/4 x 29
14 x 233/4
14 x 24

123/4 x 35
123/4 x 34
14 x 283/4
14 x 28

123/4 x 40
123/4 x 39
14 x 333/4
14 x 34

123/4 x 45
123/4 x 44
14 x 383/4
14 x 38

123/4 x 50
123/4 x 49
14 x 433/4
14 x 44

123/4 x 54
123/4 x 53
14 x 473/4
14 x 48

10 fins/inch

NA

1
1-in.

SUPPLY DUCT COLLAR
PIPING CONNECTIONS
(Sweat - 4-Row)
Inlet (in. OD)
Outlet (in. OD)

5/
8
5/
8

11/8
11/8

7/
8
7/
8

*Calculate Operating Weight of unit: Shipping Weight + Coil Water Weight x Number of Coil Rows.

Table 4 — Physical Data — 42S Series Units
UNIT SIZE 42S
NOMINAL AIRFLOW (cfm)
SHIPPING WEIGHT (lb)*
42SG,SU
42SH
42SJ
COIL WATER WEIGHT
(Approx lb per row of coil)
COILS
FPI
MOTOR (qty)
42SG,SH,SU
42SJ
BLOWER (qty)
42SG,SH,SU
42SJ
FILTERS
Nominal Size (in.) (1-in. thick)
Qty
PIPING CONNECTIONS
Inlet (in. OD)

03
300

04
400

06
600

08
800

10
1000

12
1200

180
202
360

225
247
450

240
262
480

260
286
520

280
311
560

305
336
610

1.6

1.6

2.3

2.3

3.1

3.1

14 fins/inch
1
2

1
2

1
2

1
2

1
2

1
2

1
2

1
2

1
2

1
2

1
2

1
2

121/2 x 241/4

161/4 x 263/4
1†
1/

201/2 x 291/4

2

*Calculate Operating Weight of Unit: Shipping Weight + Coil Water Weight x Number of Coil Rows.
†42SJ units require two filters.

material is allowed to be deposited on the motor or blower
wheels of any unit.

PRE-INSTALLATION
Unpack and Inspect Units — Remove shipping wraps

Prepare Jobsite for Unit Installation — To save
time and to reduce the possibility of costly errors, set up a complete sample installation in a typical room at jobsite. Check all
critical dimensions such as pipe, wire, and duct connection
requirements. Refer to job drawings and product dimension
drawings as required (see Fig. 1-36). Instruct all trades in their
part of the installation.

from all units. Check the shipment against shipping order.
Make sure that furnished only items, such as thermostat,
grilles, etc., are accounted for, whether packaged separately or
shipped at a later date. If shipment is damaged or incomplete,
file claim with transportation company and advise Carrier immediately.

Protect Units from Damage — The equipment must
always be properly supported. Temporary supports used during
installation or service must be adequate to hold the equipment
securely. Equipment should always be stored in the proper orientation as marked on the carton. To maintain warranty, protect
units against adverse weather, theft, vandalism, and debris on
jobsite. Equipment covered in this manual is not suitable for
outdoor installations. Do not allow foreign material to fall into
drain pan. Prevent dust and debris from being deposited on motor and fan wheels. Manufacturer's warranty is void if foreign

Identify and Prepare Units — Be sure power require-

ments match available power source. Refer to unit nameplate
and wiring diagram.
1. Check all tags on unit to determine if shipping screws are
to be removed. Remove screws as directed.
2. Rotate the fan wheel by hand to ensure that the fan is
unrestricted and can rotate freely. Check for shipping
damage and fan obstructions.

3

1
2
3
4
5
6

—
—
—
—
—
—

7 —
8 —
9 —
10 —

UNIT
SIZE
02
03
04
06
08
10
12

NOTES:
1. Right hand unit shown; left hand unit opposite. Coil connection
locations are ±5/8-in.
2. Unit sizes 02 and 03 have one motor, one blower; sizes 04
through 08 have one motor, 2 blowers; sizes 10 and 12 have
2 motors, 4 blowers.
3. Standard 3-row coil shown.
4. Overall unit dimension increases by 4 in. with optional electric
heat.
5. Not shown: 3-speed fan switch; wall plate, closed cell foam on
main drain pan.
6. Units have galvanized finish.
7. For optional coil connections, view 42CA-203-1 using the Fan Coil
Builder.
a42-4099.eps
8. Dimensions shown in inches (mm).

LEGEND
Junction Box (remote mount)
Flexible Metal Conduit
Drain Conn, 7/8-in. OD
Tell-Tale Drain Conn, 5/8-in. OD (optional)
Drip Lip (optional)
Hanger Slots (4), Rubber Grommet
has 3/8-in. Diameter Hole
Supply Duct Collar, 1-in.
Air Vent, 1/8-in. MPT
Return Conn, 5/8-in. OD
Supply Conn, 5/8-in. OD

NOM
AIRFLOW
(Cfm)
200
300
400
600
800
1000
1200

DIMENSIONS (in.)

QTY/UNIT

A

A’

B

D’

E

F

G

H

Blower

211/4
251/4
311/4
361/4
431/4
571/4
651/4

311/4
361/4
431/4
431/4
571/4
651/4
751/4

16
20
26
31
38
52
60

13
14
15
10
17
11
13

181/4
221/4
281/4
331/4
401/4
541/4
621/4

6 1 /4
6 1 /4
6 1 /4
7 1 /2
7 1 /2
7 1 /2
7 1 /2

83/4
83/4
83/4
10
10
10
10

193/4
233/4
293/4
343/4
413/4
553/4
633/4

1
1
2
2
2
4
4

Motor
1
1
1
1
1
2
2

*Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.

Fig. 1 — 42CA Furred-In Horizontal Unit Dimensions

4

FACE
AREA
(sq ft)
0.83
1.08
1.35
1.88
2.31
3.16
3.65

UNIT
WEIGHT*
(lb)
36
39
49
59
64
95
107

1 —
2 —
3 —
4 —
5 —
6 —
7 —
8 —
9 —
10 —
11 —
12 —

UNIT
SIZE
02
03
04
06
08
10
12

NOTES:
1. Right hand unit shown; left hand unit opposite. Coil connection
locations are ±5/8-in.
2. Unit sizes 02 and 03 have one motor, one blower; sizes 04
through 08 have one motor, 2 blowers; sizes 10 and 12 have
2 motors, 4 blowers.
3. Standard 3-row coil shown.
4. Overall unit dimension increases by 4 in. with optional electric
heat.
5. Not shown: 3-speed fan switch; wall plate, closed cell foam on
main drain pan.
6. Units have galvanized finish.
7. For optional coil connections, view 42CA-203-1 using the Fan Coil
Builder.
a42-4100.eps
8. Dimensions shown in inches (mm).

LEGEND
Junction Box (remote mount)
Flexible Metal Conduit
Strip Heater High Limit
Electric Strip Heater Element
Tell-Tale Drain Conn, 5/8-in. OD (optional)
Drain Conn, 7/8-in. OD
Drip Lip (optional)
Supply Duct Collar, 1-in.
Air Vent, 1/8-in. MPT
Return Conn, 5/8-in. OD
Supply Conn, 5/8-in. OD
Hanger Slots (4), Rubber Grommet
has 3/8-in. Diameter Hole
NOM
AIRFLOW
(Cfm)
200
300
400
600
800
1000
1200

DIMENSIONS (in.)

QTY/UNIT

A

A’

B

D’

E

F

G

H

Blower

Motor

211/4
251/4
311/4
361/4
431/4
571/4
651/4

311/4
361/4
431/4
431/4
571/4
651/4
751/4

16
20
26
31
38
52
60

13
14
15
10
17
11
13

181/4
221/4
281/4
331/4
401/4
541/4
621/4

6 1 /4
6 1 /4
6 1 /4
7 1 /2
7 1 /2
7 1 /2
7 1 /2

83/4
83/4
83/4
10
10
10
10

193/4
233/4
293/4
343/4
413/4
553/4
633/4

1
1
2
2
2
4
4

1
1
1
1
1
2
2

*Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.

Fig. 2 — 42CA Furred-In Horizontal Unit with Electric Heat Dimensions

5

FACE
AREA
(sq ft)
0.83
1.08
1.35
1.88
2.31
3.16
3.65

UNIT
WEIGHT*
(lb)
38
41
51
61
66
97
109

1—
2—
3—
4—
5—
6—
7—
8—
9—
10 —
11 —
12 —
13 —
14 —
15 —

UNIT
SIZE
02
03
04
06
08
10
12

NOTES:
1. Right hand unit with standard 3-row coil shown; left hand unit opposite. Coil
connection locations are ±5/8-in.
2. Unit sizes 02 and 03 have one motor, one blower; sizes 04 through 08 have
one motor, 2 blowers; sizes 10 and 12 have 2 motors, 4 blowers.
3. Standard 3-row coil shown.
4. Unit available with bottom or rear return air.
5. Dimension increases by 4 in. with optional electric heat.
6. Not shown: 3-speed fan switch; wall plate, 1/2-in. fiberglass insulation on
inside of plenum, closed cell foam on main drain pan.
7. Units have galvanized finish.
8. For optional coil connections, view 42CA-203-1 using the Fan Coil Builder.
9. Dimensions shown in inches (mm).

LEGEND
Junction Box, 4 in. x 4 in.
Flexible Metal Conduit
Mounting Bracket
Drain Conn, 7/8-in. OD
Tell-Tale Drain Conn, 5/8-in. OD (optional)
Drip Lip (optional, shipped loose)
Filter
Return Duct Collar, 1-in.
Filter Access Panel
Access Panel
Supply Duct Collar, 1-in.
Air Vent, 1/8-in. MPT
Return Conn, 5/8-in. OD
Supply Conn, 5/8-in. OD
Hanger Slots (4), Rubber Grommet has
3/ -in. Diameter Hole
8

NOM
AIRFLOW
(Cfm)
200
300
400
600
800
1000
1200

a42-4101

DIMENSIONS (in.)

QTY/UNIT

A

A’

B

C

D’

E

F

G

H

Blower

Motor

211/4
251/4
311/4
361/4
431/4
571/4
651/4

311/4
361/4
431/4
431/4
571/4
651/4
751/4

16
20
26
31
38
52
60

181/4
221/4
281/4
331/4
401/4
541/4
621/4

13
14
15
10
17
11
13

193/4
233/4
293/4
343/4
413/4
553/4
633/4

61/4
61/4
61/4
71/2
71/2
71/2
71/2

83/4
83/4
83/4
10
10
10
10

153/8
193/8
253/8
303/8
373/8
513/8
593/8

1
1
2
2
2
4
4

1
1
1
1
1
2
2

*Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.

Fig. 3 — 42CE Furred-In Horizontal Unit with Plenum Dimensions

6

FACE
AREA
(sq ft)
0.83
1.08
1.35
1.88
2.31
3.16
3.65

UNIT
WEIGHT*
(lb)
55
60
70
82
95
135
154

1—
2—
3—
4—
5—
6—
7—
8—
9—
10 —
11 —
12 —
13 —
14 —
15 —
16 —
17 —

UNIT
SIZE
02
03
04
06
08
10
12

NOTES:
1. Right hand unit with standard 3-row coil shown; left hand unit opposite. Coil
connection locations are ±5/8-in.
2. Unit sizes 02 and 03 have one motor, one blower; sizes 04 through 08 have
one motor, 2 blowers; sizes 10 and 12 have 2 motors, 4 blowers.
3. Standard 3-row coil shown.
4. Unit available with bottom or rear return air.
5. Dimension increases by 4 in. with optional electric heat.
6. Not shown: 3-speed fan switch; wall plate, 1/2-in. fiberglass insulation on
inside of plenum, closed cell foam on main drain pan.
7. Units have galvanized finish.
8. For optional coil connections, view 42CA-203-1 using the Fan Coil Builder.
9. Dimensions shown in inches (mm).

LEGEND
Junction Box, 4 in. x 4 in.
Flexible Metal Conduit
Mounting Bracket
Electric Strip Heater Element
Drain Conn, 7/8-in. OD
Strip Heater High Limit
Tell-Tale Drain Conn, 5/8-in. OD (optional)
Drip Lip (optional, shipped loose)
Filter
Return Duct Collar, 1-in.
Filter Access Panel
Access Panel
Supply Duct Collar, 1-in.
Air Vent, 1/8-in. MPT
Return Conn, 5/8-in. OD
Supply Conn, 5/8-in. OD
Hanger Slots (4), Rubber Grommet has
3/ -in. Diameter Hole
8

NOM
AIRFLOW
(Cfm)
200
300
400
600
800
1000
1200

A42-4102

DIMENSIONS (in.)

QTY/UNIT

A

A’

B

C

D’

E

F

G

H

Blower

Motor

211/4
251/4
311/4
361/4
431/4
571/4
651/4

311/4
361/4
431/4
431/4
571/4
651/4
751/4

16
20
26
31
38
52
60

181/4
221/4
281/4
331/4
401/4
541/4
621/4

13
14
15
10
17
11
13

193/4
233/4
293/4
343/4
413/4
553/4
633/4

61/4
61/4
61/4
71/2
71/2
71/2
71/2

83/4
83/4
83/4
10
10
10
10

153/8
193/8
253/8
303/8
373/8
513/8
593/8

1
1
2
2
2
4
4

1
1
1
1
1
2
2

FACE
AREA
(sq ft)
0.83
1.08
1.35
1.88
2.31
3.16
3.65

*Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.

Fig. 4 — 42CE Furred-In Horizontal Unit with Plenum and Electric Heat Dimensions

7

UNIT
WEIGHT*
(lb)
57
62
72
84
97
137
156

1—
2—
3—
4—
5—
6—
7—
8—
9—
10 —
11 —
12 —
13 —
14 —
15 —

UNIT
SIZE
04
06
08
10

NOTES:
1. Right hand unit shown; left hand unit opposite. Coil connection
locations are ±5/8-in.
2. Unit sizes 04 thru 08 have one motor, 2 blowers; size 10 has
2 motors, 4 blowers.
3. Refer to above figure for configuration of filter and track if
installed in optional plenum.
4. Dimension increases by 4 in. with optional electric heat.
5. Not shown: 3-speed fan switch; wall plate, 1/2-in. fiberglass
insulation on inside of plenum (when installed), closed cell
insulation on main drain pan.
6. Units have galvanized finish.
7. For optional coil connections, view 42CA-203-1 using the Fan
Coil Builder.
8. Dimensions shown in inches (mm).

LEGEND
Junction Box, Installed with Plenum
Flexible Metal Conduit
Insulated Plenum
Mounting Bracket
Drain Conn, 7/8-in. OD
Tell-Tale Drain Conn, 5/8-in. OD (optional)
Drip Lip (optional, shipped loose)
Filter
Return Duct Collar, 1-in.
Access Panel
Supply Duct Collar, 1-in.
Supply Conn, 5/8-in. OD
Air Vent, 1/8-in. MPT
Return Conn, 5/8-in. OD
Hanger Slots (4), Rubber Grommet has
3/ -in. Diameter Hole
8

NOM
AIRFLOW
(Cfm)
400
600
800
1000

A42-4103

DIMENSIONS (in.)

QTY/UNIT

A

A’

B

C

D’

E

F

G

H

Blower

Motor

311/4
361/4
431/4
571/4

431/4
431/4
571/4
651/4

26
34
38
52

281/4
331/4
401/4
541/4

15
10
17
11

293/4
343/4
413/4
553/4

6 1 /4
7 1 /2
7 1 /2
7 1 /2

83/4
10
10
10

301/4
351/4
421/4
561/4

2
2
2
4

1
1
1
2

*Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.

Fig. 5 — 42CF Furred-In High-Static Horizontal Unit with Plenum Dimensions

8

FACE
AREA
(sq ft)
1.35
1.88
2.31
3.16

UNIT
WEIGHT*
(lb)
84
97
110
163

1—
2—
3—
4—
5—
6—
7—
8—
9—
10 —
11 —
12 —
13 —
14 —
15 —
16 —

UNIT
SIZE
04
06
08
10

NOTES:
1. Right hand unit shown; left hand unit opposite. Coil connection
locations are ±5/8-in.
2. Unit sizes 04 thru 08 have one motor, 2 blowers; size 10 has
2 motors, 4 blowers.
3. Refer to above figure for configuration of filter and track if
installed in optional plenum.
4. Dimension increases by 4 in. with optional electric heat.
5. Not shown: 3-speed fan switch; wall plate, 1/2-in. fiberglass
insulation on inside of plenum (when installed), closed cell
insulation on main drain pan.
6. Units have galvanized finish.
7. For optional coil connections, view 42CA-203-1 using the Fan
Coil Builder.
8. Dimensions shown in inches (mm).

LEGEND
Junction Box, Installed with Plenum
Plenum
Flexible Metal Conduit
Mounting Bracket
Electric Strip Heater Element
Drain Conn, 7/8-in. OD
Drip Lip (optional, shipped loose)
Tell-Tale Drain Conn, 5/8-in. OD (optional)
Filter
Return Duct Collar, 1-in.
Air Vent, 1/8-in. MPT
Access Panel
Return Conn, 5/8-in. OD
Supply Conn, 5/8-in. OD
Supply Duct Collar, 1-in.
Hanger Slots (4), Rubber Grommet has
3/ -in. Diameter Hole
8

NOM
AIRFLOW
(Cfm)
400
600
800
1000

A42-4104

DIMENSIONS (in.)

QTY/UNIT

A

A’

B

C

D’

E

F

G

H

Blower

311/4
361/4
431/4
571/4

431/4
431/4
571/4
651/4

26
34
38
52

281/4
331/4
401/4
541/4

15
10
17
11

293/4
343/4
413/4
553/4

61/4
71/2
71/2
71/2

83/4
10
10
10

301/4
351/4
421/4
561/4

2
2
2
4

Motor
1
1
1
2

FACE
AREA
(sq ft)
1.35
1.88
2.31
3.16

*Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.

Fig. 6 — 42CF Furred-In Horizontal Unit with Plenum and Electric Heat Dimensions

9

UNIT
WEIGHT*
(lb)
84
97
110
163

1—
2—
3—
4—
5—
6—
7—
8—
9—
10 —
11 —
12 —
13 —
14 —
15 —

UNIT
SIZE
02
03
04
06
08
10
12

NOTES:
1. Right hand unit shown; left hand unit opposite. Coil connection locations
are ±5/8-in.
2. Unit sizes 02 and 03 have one motor, one blower; sizes 04 through 08
have one motor, 2 blowers; sizes 10 and 12 have 2 motors, 4 blowers.
3. Cabinet has an Arctic White baked finish.
4. Refer to supply and return connections above for coil stub-out locations.
5. Not shown: optional drip lip, 3-speed fan switch; wall plate, 1/2-in. fiberglass insulation on inside of casing, closed cell foam on main drain pan.
6. For optional coil connections, view 42CA-203-1 using the Fan Coil
Builder.
7. Valve package is factory-installed inside the cabinet when ordered with
the unit (based on component size).
8. Dimensions shown in inches (mm).

LEGEND
Junction Box, 4 in. x 4 in.
Optional Return Air Location
Optional Drip Lip, shipped loose
Mounting Holes (4), Rubber Grommets
have 3/8-in. Diameter Hole
Electrical KO, 7/8-in. Diameter
Return KO, 1-in. Diameter
Supply KO, 11/2-in. Diameter
Drain KO, 11/2-in. Diameter
Supply, Return Connections, 5/8-in. OD
Drain Connection, 7/8-in. OD
Optional Valve Package (inside cabinet)
Filter
Standard Stamped-Return Air Grille
Removable Hinged Access Panel
Supply Grille, Stamped, Standard

NOM
AIRFLOW
(Cfm)
200
300
400
600
800
1000
1200

A42-4105

DIMENSIONS (in.)
A

B

38
42
48
53
60
74
82

171/8
211/2
257/8
345/8
39
521/8
607/8

C
107/16
101/4
111/16
93/16
101/2
1015/16
109/16

QTY/UNIT

E

F

G

Blower

34
38
44
49
56
70
78

5 3 /4
5 3 /4
5 3 /4
6 3 /4
6 3 /4
6 3 /4
6 3 /4

11
11
11
12
12
12
12

1
1
2
2
2
4
4

Motor
1
1
1
1
1
2
2

*Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.

Fig. 7 — 42CG Horizontal Cabinet Unit Dimensions

10

FACE
AREA
(sq ft)
0.83
1.08
1.35
1.88
2.31
3.16
3.65

UNIT
WEIGHT*
(lb)
98
118
126
168
176
215
245

1—
2—
3—
4—
5—
6—
7—
8—
9—
10 —
11 —
12 —
13 —
14 —
15 —
16 —

UNIT
SIZE
02
03
04
06
08
10
12

NOTES:
1. Right hand unit shown; left hand unit opposite. Coil connection
locations are ±5/8-in.
2. Unit sizes 02 and 03 have one motor, one blower; sizes 04
through 08 have one motor, 2 blowers; sizes 10 and 12 have
2 motors, 4 blowers.
3. Cabinet has an Arctic White baked finish.
4. Refer to supply and return connections above for coil stub-out
locations.
5. Not shown: optional drip lip, 3-speed fan switch; wall plate,
1/ -in. fiberglass insulation on inside of casing, closed cell foam
2
on main drain pan.
6. For optional coil connections, view 42CA-203-1 using the Fan
Coil Builder.
7. Valve package is factory-installed inside the cabinet when
ordered with the unit (based on component size).
8. Dimensions shown in inches (mm).

LEGEND
Junction Box, 4 in. x 4 in.
Optional Stamped Rear Return Grille
Optional Drip Lip, shipped loose
Electric Strip Heater Element
Mounting Holes (4), Rubber Grommets
have 3/8-in. Diameter Hole
Electrical KO, 7/8-in. Diameter
Return KO, 1-in. Diameter
Supply KO, 11/2-in. Diameter
Drain KO, 11/2-in. Diameter
Drain Connection, 7/8-in. OD
Optional Valve Package (inside cabinet)
Filter
Standard Stamped-Return Air Grille
Removable Hinged Access Panel
Supply, Return Connections, 5/8-in. OD
Supply Grille, Stamped, Standard
NOM
AIRFLOW
(Cfm)
200
300
400
600
800
1000
1200

A42-4106

DIMENSIONS (in.)
A

B

38
42
48
53
60
74
82

171/8
211/2
257/8
345/8
39
521/8
607/8

C
107/16
101/4
111/16
93/16
101/2
1015/16
109/16

QTY/UNIT

E

F

G

Blower

Motor

34
38
44
49
56
70
78

53/4
53/4
53/4
63/4
63/4
63/4
63/4

11
11
11
12
12
12
12

1
1
2
2
2
4
4

1
1
1
1
1
2
2

*Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.

Fig. 8 — 42CG Horizontal Cabinet with Electric Heat Dimensions

11

FACE
AREA
(sq ft)
0.83
1.08
1.35
1.88
2.31
3.16
3.65

UNIT
WEIGHT*
(lb)
98
118
126
168
176
215
245

NOTES:
1. Right hand unit shown; left hand unit opposite.
2. Internal factory valve package and drains may not align with
cabinet knockouts.
3. Dimensions shown in inches (mm). All dimensions are ±1/4 in.
4. Bottom panel is Arctic White polyester powder coat paint.

UNIT
SIZE
02
03
04
06
08
10
12

NOM
AIRFLOW
(Cfm)
200
300
400
600
800
1000
1200

A42-4149

DIMENSIONS (in.)

QTY/UNIT

A

B

C

D

E

F

Blower

Motor

BOTTOM RETURN
FILTER SIZE, (in.)

35
35
41
53
53
75
75

16
20
26
31
38
52
60

123/4
83/4
83/4
153/4
83/4
163/4
83/4

37
37
43
55
55
77
77

32
32
38
50
50
72
72

6
6
6
7
7
7
7

1
1
2
2
2
4
4

1
1
1
1
1
2
2

10 x 28
10 x 28
10 x 33
10 x 45
10 x 45
10 x 62
10 x 62

Fig. 9 — 42CK Horizontal Cabinet Unit with Telescopic Access Panel,
Front Supply, and Bottom Return Dimensions

12

NOTES:
1. Right hand unit shown; left hand unit opposite.
2. Internal factory valve package and drains may not align with
cabinet knockouts.
3. Dimensions shown in inches (mm). All dimensions are ±1/4 in.
4. Bottom panel is Arctic White polyester powder coat paint.

UNIT
SIZE
02
03
04
06
08
10
12

NOM
AIRFLOW
(Cfm)
200
300
400
600
800
1000
1200

a42-4150

DIMENSIONS (in.)

QTY/UNIT

A

B

C

D

E

F

Blower

Motor

BOTTOM RETURN
FILTER SIZE, (in.)

35
35
41
53
53
75
75

16
20
26
31
38
52
60

123/4
83/4
83/4
153/4
83/4
163/4
83/4

37
37
43
55
55
77
77

32
32
38
50
50
72
72

6
6
6
7
7
7
7

1
1
2
2
2
4
4

1
1
1
1
1
2
2

10 x 28
10 x 28
10 x 33
10 x 45
10 x 45
10 x 62
10 x 62

Fig. 10 — 42CK Horizontal Cabinet Unit with Telescopic Access Panel,
Front Supply, Bottom Return, and Heater Dimensions

13

NOTES:
1. Right hand unit shown; left hand unit opposite.
2. Internal factory valve package and drains may not align with
cabinet knockouts.
3. Dimensions shown in inches (mm). All dimensions are ±1/4 in.
4. Bottom panel is Arctic White polyester powder coat paint.

UNIT
SIZE
02
03
04
06
08
10
12

NOM
AIRFLOW
(Cfm)
200
300
400
600
800
1000
1200

a42-4151

DIMENSIONS (in.)

QTY/UNIT

A

B

C

D

E

F

Blower

Motor

REAR RETURN
FILTER SIZE, (in.)

35
35
41
43
43
75
75

16
20
26
31
38
52
60

123/4
83/4
83/4
153/4
83/4
163/4
83/4

37
37
43
55
55
77
77

32
32
38
50
50
72
72

6
6
6
7
7
7
7

1
1
2
2
2
4
4

1
1
1
1
1
2
2

7 x 21
7 x 21
7 x 27
7 x 38
7 x 38
7 x 52
7 x 52

Fig. 11 — 42CK Horizontal Cabinet Unit with Telescopic Access Panel,
Front Supply, and Rear Return Dimensions

14

NOTES:
1. Right hand unit shown; left hand unit opposite.
2. Internal factory valve package and drains may not align with
cabinet knockouts.
3. Dimensions shown in inches (mm). All dimensions are ±1/4 in.
4. Bottom panel is Arctic White polyester powder coat paint.

UNIT
SIZE
02
03
04
06
08
10
12

NOM
AIRFLOW
(Cfm)
200
300
400
600
800
1000
1200

a42-4152

DIMENSIONS (in.)

QTY/UNIT

A

B

C

D

E

F

Blower

Motor

REAR RETURN
FILTER SIZE, (in.)

35
35
41
43
43
75
75

16
20
26
31
38
52
60

123/4
83/4
83/4
153/4
83/4
163/4
83/4

37
37
43
55
55
77
77

32
32
38
50
50
72
72

6
6
6
7
7
7
7

1
1
2
2
2
4
4

1
1
1
1
1
2
2

7 x 21
7 x 21
7 x 27
7 x 38
7 x 38
7 x 52
7 x 52

Fig. 12 — 42CK Horizontal Cabinet Unit with Telescopic Access Panel,
Front Supply, Rear Return, and Heater Dimensions

15

LEGEND
1 — Junction Box, 4 in. x 4 in.
2 — Optional Drip Lip, shipped loose
3 — Mounting Holes (4), Rubber Grommets
have 3/8-in. Diameter Hole
4 — Piping KO, 11/2-in. Diameter
5 — Electrical KO, 7/8-in. Diameter
6 — Drain KO, 11/2-in. Diameter
7 — Supply Duct Collar
8 — Return Connection, 5/8-in. OD.
9 — Optional Rear Return. Consult factory for
collar dimensions.
10 — Drain, 7/8-in. OD.
11 — Stamped Bottom Return Air Grille
12 — Filter
13 — Stamped Air Supply Grille
14 — Hinged Bottom Access Panel
15 — Supply Connection, 5/8-in. OD.

UNIT
SIZE
02
03
04
06
08
10
12

NOM
AIRFLOW
(Cfm)
200
300
400
600
800
1000
1200

NOTES:
1. Right hand unit shown; left hand unit opposite. Coil connection
locations are ±5/8-in.
2. Unit sizes 02 and 03 have one motor, one blower; sizes 04
through 08 have one motor, 2 blowers; sizes 10 and 12 have
2 motors, 4 blowers.
3. Bottom access panel has an Arctic White baked finish.
4. Refer to supply and return connections above for coil stub-out
locations.
5. Not shown: optional drip lip, 3-speed fan switch; wall plate,
1/ -in. fiberglass insulation on inside of casing, closed cell foam
2
on main drain pan.
6. For optional coil connections, view 42CA-203-1 using the Fan
Coil Builder.
7. Valve package is factory-installed inside the cabinet when
ordered with the unit (based on component size).
8. Bottom return or bottom supply is an ETO (engineering to order)
request.
A42-4107
9. Dimensions shown in inches (mm).

DIMENSIONS (in.)

QTY/UNIT

A

D

E

Blower

Motor

FACE AREA
(sq ft)

UNIT WEIGHT*
(lb)

35
35
41
53
53
75
75

37
37
43
55
55
77
77

32
32
38
50
50
72
72

1
1
2
2
2
4
4

1
1
1
1
1
2
2

0.83
1.08
1.35
1.88
2.31
3.16
3.65

115
120
135
150
155
227
241

*Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.

Fig. 13 — 42CK Horizontal Cabinet Unit with Telescopic Access Panel

16

1—
2—
3—
4—
5—
6—
7—
8—
9—
10 —
11 —
12 —
13 —
14 —
15 —
16 —
17 —

LEGEND
Junction Box, 4 in. x 4 in.
Strip Heater High Limit
Electric Strip Heater Element
Optional Drip Lip, shipped loose
Mounting Holes (4), Rubber Grommets
have 3/8-in. Diameter Hole
Piping KO, 11/2-in. Diameter
Electrical KO, 7/8-in. Diameter
Drain KO, 11/2-in. Diameter
Supply Duct Collar
Optional Rear Return. Consult factory for
collar dimensions.
Drain, 7/8-in. OD.
Stamped Bottom Return Air Grille
Filter
Stamped Air Supply Grille
Hinged Bottom Access Panel
Supply Connection, 5/8-in. OD.
Return Connection, 5/8-in. OD.

UNIT SIZE

NOM AIRFLOW
(Cfm)

02
03
04
06
08
10
12

200
300
400
600
800
1000
1200

A
35
35
41
53
53
75
75

DIMENSIONS (in.)
D
37
37
43
55
55
77
77

NOTES:
1. Right hand unit shown; left hand unit opposite. Coil connection
locations are ±5/8-in.
2. Unit sizes 02 and 03 have one motor, one blower; sizes 04
through 08 have one motor, 2 blowers; sizes 10 and 12 have
2 motors, 4 blowers.
3. Bottom access panel has an Arctic White baked finish.
4. Refer to supply and return connections above for coil stub-out
locations.
5. Not shown: optional drip lip, 3-speed fan switch; wall plate,
1/ -in. fiberglass insulation on inside of casing, closed cell foam
2
on main drain pan.
6. For optional coil connections, view 42CA-203-1 using the Fan
Coil Builder.
7. Valve package is factory-installed inside the cabinet when
ordered with the unit (based on component size).
8. Bottom return or bottom supply is an ETO (engineering to order)
request.
9. Dimensions shown in inches (mm).

A42-4108

E
32
32
38
50
50
72
72

QTY/UNIT
Blower
Motor
1
1
1
1
2
1
2
1
2
1
4
2
4
2

FACE AREA
(sq ft)

UNIT WEIGHT*
(lb)

0.83
1.08
1.35
1.88
2.31
3.16
3.65

117
122
137
152
157
229
243

*Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.

Fig. 14 — 42CK Horizontal Cabinet with Telescopic Access Panel and Electric Heat Dimensions

17

1—
2—
3—
4—
5—
6—
7—
8—
9—
10 —
11 —

UNIT
SIZE
02
03
04
06
08
10
12

LEGEND
Optional Unit Mounted Control Box
Wall Mounting Holes (4), 3/4-in. Diameter
Drain, 3/4-in. MPT
Drain Pan, Auxiliary, Shipped Loose
Supply Conn, 5/8-in. OD
Return Conn, 5/8-in. OD
Filter
Air Vent, 1/8-in. MPT
Discharge Opening
Flexible Conduit
Front Access Panel

NOM
AIRFLOW
(Cfm)
200
300
400
600
800
1000
1200

NOTES:
1. Right hand unit shown; left hand unit opposite. Coil connection locations
are ± 5/8-in.
2. Unit sizes 02 and 03 have one motor, one blower; sizes 04 through 08
have one motor, 2 blowers; sizes 10 and 12 have 2 motors, 4 blowers.
3. Standard 3-row coil shown.
4. Optional unit-mounted switch box and controls, when specified, are
installed on opposite side from cooling connections.
5. Not shown: 3-speed fan switch; wall plate, 1/2-in. fiberglass insulation on
inside of casing, closed cell foam on main drain pan.
6. Units have galvanized finish.
7. For optional coil connections, view 42VA-203-1 using the Fan Coil
Builder.
8. Dimensions shown in inches (mm).
A42-4109

DIMENSIONS (in.)

QTY/UNIT

A

B

C

D

Blower

Motor

25
29
35
45
47
61
69

22
26
32
42
44
58
66

231/2
271/2
331/2
431/2
451/2
591/2
671/2

16
20
26
36
38
52
60

1
1
2
2
2
4
4

1
1
1
1
1
2
2

*Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.

Fig. 15 — 42VA Furred-In Vertical Unit Dimensions

18

FACE
AREA
(sq ft)
0.83
1.08
1.35
1.88
2.31
3.16
3.65

UNIT
WEIGHT*
(lb)
65
80
90
112
115
140
170

1—
2—
3—
4—
5—
6—
7—
8—
9—
10 —
11 —
12 —
13 —

UNIT
SIZE
02
03
04
06
08
10
12

LEGEND
Standard Stamped Supply Grille
Access Door, Fan Switch
Supply Conn, 5/8-in. OD
Return Conn, 5/8-in. OD
Drain, 3/4-in. MPT
Filter
Air Vent, 1/8-in. MPT
Front Panel Fastener
Drain Pan, Auxiliary, Shipped Loose
Wall Mounting Holes (4), 3/4-in. Diameter
Flexible Conduit
Fan Switch, 3-speed
Front Access Panel
NOM
AIRFLOW
(Cfm)
200
300
400
600
800
1000
1200

NOTES:
1. Right hand unit shown; left hand unit opposite. Coil connection
locations are ± 5/8-in.
2. Unit sizes 02 and 03 have one motor, one blower; sizes 04 through
08 have one motor, 2 blowers; sizes 10 and 12 have 2 motors,
4 blowers.
3. Standard 3-row coil shown.
4. Cabinet has an Arctic White baked finish.
5. Stamped supply grille standard. Optional single or double deflection grilles available.
6. Not shown: 1/2-in. fiberglass insulation on inside of casing, closed
cell foam on main drain pan.
7. For optional coil connections, view 42VA-203-1 using the Fan Coil
Builder.
A42-4110
8. Dimensions shown in inches (mm).

DIMENSIONS (in.)

QTY/UNIT

A

B

C

D

E

Blower

41
45
51
61
63
77
85

22
26
32
42
44
58
66

231/2
271/2
331/2
431/2
451/2
591/2
671/2

171/4
211/2
26
39
39
52
61

35/8
31/2
41/4
23/4
33/4
41/4
33/4

1
1
2
2
2
4
4

Motor
1
1
1
1
1
2
2

*Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.

Fig. 16 — 42VB Vertical Cabinet Unit Dimensions

19

FACE
AREA
(sq ft)
0.83
1.08
1.35
1.88
2.31
3.16
3.65

UNIT
WEIGHT*
(lb)
89
95
116
134
137
169
192

1—
2—
3—
4—
5—
6—
7—
8—
9—
10 —
11 —
12 —
13 —
14 —
UNIT
SIZE
02
03
04
06
08
10
12

LEGEND
Standard Stamped Supply Grille
Access Door, Fan Switch
Supply Conn, 5/8-in. OD
Return Conn, 5/8-in. OD
Drain, 3/4-in. MPT
Filter
Air Vent, 1/8-in. MPT
Front Panel Fastener
Optional Valve Package (inside cabinet)
Drain Pan, Auxiliary, Shipped Loose
Wall Mounting Holes 3/4-in. Diameter
Flexible Conduit
Fan Switch, 3 speed
Access Doors
NOM
AIRFLOW
(Cfm)
200
300
400
600
800
1000
1200

NOTES:
1. Right hand unit shown; left hand unit opposite. Coil connection
locations are ± 5/8-in.
2. Unit sizes 02 and 03 have one motor, one blower; sizes 04
through 08 have one motor, 2 blowers; sizes 10 and 12 have
2 motors, 4 blowers.
3. Standard 3-row coil shown.
4. Cabinet has an Arctic White baked finish.
5. Not shown: 1/2-in. fiberglass insulation on inside of casing,
closed cell foam on main drain pan.
6. For optional coil connections, view 42VA-203-1 using the Fan
Coil Builder.
7. Valve package is factory-installed inside the cabinet when
ordered with the unit (based on component size).
A42-4111
8. Dimensions shown in inches (mm).

DIMENSIONS (in.)

QTY/UNIT

A

B

C

D

E

Blower

Motor

41
45
51
61
63
77
85

22
26
32
42
44
58
66

231/2
271/2
331/2
431/2
451/2
591/2
671/2

171/4
211/2
26
39
39
521/8
61

35/8
31/2
41/4
23/4
33/4
41/4
33/4

1
1
2
2
2
4
4

1
1
1
1
1
2
2

*Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.

Fig. 17 — 42VF Vertical Cabinet Unit with Slant Top Dimensions

20

FACE
AREA
(sq ft)
0.83
1.08
1.35
1.88
2.31
3.16
3.65

UNIT
WEIGHT*
(lb)
92
98
122
141
144
178
205

14-3/8
(368)

1
2
3
4
5
6
7
8

—
—
—
—
—
—
—
—

UNIT SIZE
02
03
04
06

NOTES:
1. Right hand unit shown; left hand unit opposite. Coil connection
locations are ± 5/8-in.
2. Unit sizes 02 through 04 have one motor, 2 blowers; size 06
has 2 motors, 4 blowers.
3. Standard 2-row coil shown.
4. Optional unit-mounted switch box and controls, when specified,
are installed on opposite side from cooling connections.
5. Height increases by 2 in. with electric heat.
6. Not shown: 3-speed fan switch, 1/2-in. fiberglass insulation on
inside of casing, closed cell foam on main drain pan.
7. Units have galvanized finish.
8. For optional coil connections, view 42VC-203-1 using the Fan
Coil Builder.
A42-4112
9. Dimensions shown in inches (mm).

LEGEND
Optional Unit Mounted Control Box
Drain Pan, Auxiliary, Shipped Loose
Supply Conn, 5/8-in. OD
Drain, 3/4-in. MPT
Return Conn, 5/8-in. OD
Air Vent, 1/8-in. MPT
Discharge Opening
Filter

NOM
AIRFLOW
(Cfm)
200
300
400
600

DIMENSIONS (in.)

QTY/UNIT

A

B

C

Blower

Motor

FACE AREA
(sq ft)

UNIT
WEIGHT* (lb)

23
28
36
50

22
27
35
49

17
22
30
44

2
2
2
4

1
1
1
2

1.18
1.53
2.08
3.06

50
60
72
110

*Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.

Fig. 18 — 42VC Furred-In Lowboy Unit Dimensions

21

1—
2—
3—
4—
5—
6—
7—
8—
9—

LEGEND
Unit-Mounted Control Box (Optional)
Drain Pan, Auxiliary, Shipped Loose
Air Vent, 1/8-in. MPT
Supply Conn, 5/8-in. OD
Drain, 3/4-in. MPT
Return Conn, 5/8-in. OD
Filter
Electrical Sheath Heater Element
Discharge Opening

NOTES:
1. Right hand unit shown; left hand unit opposite. Coil connection
locations are ± 5/8-in.
2. Unit sizes 02 through 04 have one motor, 2 blowers; size 06 has
2 motors, 4 blowers.
3. Standard 2-row coil shown.
4. Optional unit-mounted switch box and controls, when specified,
are installed on opposite side from cooling connections.
5. Height increases by 2 in. with electric heat.
6. Not shown: 3-speed fan switch, 1/2-in. fiberglass insulation on
inside of casing, closed cell foam on main drain pan.
7. Units have galvanized finish.
8. For optional coil connections, view 42VC-203-1 using the Fan Coil
Builder.
9. Dimensions shown in inches (mm).

A42-4113

UNIT SIZE
02
03
04
06

NOM
AIRFLOW
(Cfm)
200
300
400
600

DIMENSIONS (in.)

QTY/UNIT

A

B

C

Blower

Motor

FACE AREA
(sq ft)

UNIT
WEIGHT* (lb)

23
28
36
50

22
27
35
49

17
22
30
44

2
2
2
4

1
1
1
2

1.18
1.53
2.08
3.06

50
60
72
110

*Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.

Fig. 19 — 42VC Furred-In Lowboy Unit with Electric Heat Dimensions

22

14-3/8
(368)

LEGEND
Fan Switch, 3-Speed, behind Access Door
Front Panel Fastener
Stamped Supply Grille
Supply Conn, 5/8-in. OD
Return Conn, 5/8-in. OD
Stamped Return Grille
Filter
Air Vent, 1/8-in. MPT
Optional Valve Package (inside cabinet)
Drain Pan, Auxiliary, with 3/4-in. MPT
Drain Connection
11 — Return Air Grille
1—
2—
3—
4—
5—
6—
7—
8—
9—
10 —

UNIT SIZE
02
03
04
06

NOM
AIRFLOW
(Cfm)
200
300
400
600

NOTES:
1. Right hand unit shown; left hand unit opposite. Coil connection
locations are ± 5/8-in.
2. Unit sizes 02 through 04 have one motor, 2 blowers; size 06 has
2 motors, 4 blowers.
3. Cabinet has an Arctic White baked finish.
4. Height increases by 2 in. with electric heat.
5. Standard 2-row coil shown.
6. Not shown: 1/2-in. fiberglass insulation on inside of casing,
closed cell foam on main drain pan.
7. For optional coil connections, view 42VC-203-1 using the Fan
Coil Builder.
8. Valve package is factory-installed inside the cabinet when
ordered with the unit (based on component size).
A42-4114
9. Dimensions shown in inches (mm).

DIMENSIONS (in.)

QTY/UNIT

A

B

D

C

Blower

Motor

FACE AREA
(sq ft)

41
46
54
68

22
27
35
49

33/4
4
35/8
41/16

17
211/2
301/4
433/8

2
2
2
4

1
1
1
2

1.18
1.53
2.08
3.06

*Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.

Fig. 20 — 42VE Cabinet Lowboy Unit Dimensions

23

UNIT
WEIGHT*
(lb)
72
100
108
154

NOTES:
1. Right hand unit shown; left hand unit opposite. Coil connection
locations are ± 5/8-in.
2. Unit sizes 02 through 04 have one motor, 2 blowers; size 06 has
2 motors, 4 blowers.
3. Cabinet has an Arctic White baked finish.
4. Height increases by 2 in. with electric heat.
5. Standard 2-row coil shown.
6. Not shown: 1/2-in. fiberglass insulation on inside of casing,
closed cell foam on main drain pan.
7. For optional coil connections, view 42VC-203-1 using the Fan
Coil Builder.
8. Valve package is factory-installed inside the cabinet when
ordered with the unit (based on component size).
9. Dimensions shown in inches (mm).
A42-4115

LEGEND
Fan Switch, 3-Speed, behind Access Door
Electrical Sheath Heater Element
Stamped Supply Grille
Supply Conn, 5/8-in. OD
Return Conn, 5/8-in. OD
Stamped Return Grille
Filter
Air Vent, 1/8-in. MPT
Front Panel Fastener
Optional Valve Package (inside cabinet)
Drain Pan, Auxiliary, with 3/4-in. MPT
Drain Connection
12 — Return Air Grille

1—
2—
3—
4—
5—
6—
7—
8—
9—
10 —
11 —

UNIT SIZE
02
03
04
06

NOM
AIRFLOW
(Cfm)
200
300
400
600

DIMENSIONS (in.)

QTY/UNIT

A

B

C

D

Blower

Motor

FACE AREA
(sq ft)

41
46
54
68

22
27
35
49

33/4
4
35/8
41/16

17
211/2
301/4
433/8

2
2
2
4

1
1
1
2

1.18
1.53
2.08
3.06

*Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.

Fig. 21 — 42VE Cabinet Lowboy Unit with Electric Heat Dimensions

24

UNIT
WEIGHT*
(lb)
72
100
108
154

1—
2—
3—
4—
5—
6—
7—
8—
9—
10 —
11 —

LEGEND
Supply Conn, 5/8-in. OD
Air Vent, 1/8-in. MPT
Filter
Return Air Grille, Stamped
Stamped Supply Grille
Return Conn, 5/8-in. OD
Removable Front Panel
Drain Conn, 7/8-in. OD
Auxiliary Drain Pan
Valve Compartment
Junction Box

UNIT SIZE
01
03

NOM
AIRFLOW
(Cfm)
150
300

NOTES:
1. Right hand unit shown; left hand unit opposite. Coil connection
locations are ± 5/8-in.
2. Front panel has an Arctic White baked finish.
3. Standard 2-row coil shown.
4. Unit size 01 has one motor, one blower; size 03 has 2 motors,
2 blowers.
5. Unit has 1/2-in. flanges for mounting to wall surface.
6. Front panel hooks at top of unit, swing down and snap in at bottom
against a spring clip.
7. Not shown: 3-speed fan switch, wall plate, 1/2-in. fiberglass insulation on inside of casing, closed cell foam on main drain pan.
8. Dimensions shown in inches (mm).
A42-4116

DIMENSIONS (in.)

QTY/UNIT

A

B

C

D

E

Blower

253/4
393/4

153/4
293/4

14
28

11/2
115/16

123/4
257/8

1
2

*Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.

Fig. 22 — 42VG Furred-In Wall Unit Dimensions

25

Motor
1
2

UNIT
WEIGHT*
(lb)
40
74

UNIT
SIZE
06
08
10
12
14
16
18
20

NOM
AIRFLOW
(cfm)
600
800
1000
1200
1400
1600
1800
2000

DIMENSIONS (in. ± 1/8)

QTY/UNIT

A

A’

B

D’

E

H

Blower

Motor

UNIT
WEIGHT*
(lb)

23
28
32
37
42
47
52
56

32
37
42
47
52
56
62
66

14
19
23
28
33
38
43
47

131/2
131/2
141/2
141/2
141/2
131/2
141/2
141/2

17
22
26
31
36
41
46
50

181/2
231/2
271/2
321/2
371/2
421/2
471/2
511/2

1
1
1
2
2
2
2
2

1
1
1
2
2
2
2
2

64
79
90
108
119
124
141
151

*Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other
components.
NOTES:
1. Right hand unit shown; left hand unit opposite. Coil connection locations are ± 5/8 inches.
2. Sizes 06, 08 and 10 have one motor, one blower; sizes 12 through 20 have 2 motors, 2 blowers.
3. Standard 4-row coil shown. Other coil option dimensional data available on request.
4. For optional coil connections, view 42DA-203-1 using the Fan Coil Builder.
5. Fan switch, wall plate not shown.
6. Galvanized finish provided as standard.
7. Dimensions are in inches (mm).

1—
2—
3—
4—
5—
6—
7—
8—
9—
10 —
11 —

LEGEND
Motor Junction Box
Motor-Blower Assembly
Electric Strip Heater Element (optional)
Auxiliary Drip Lip (Optional, Shipped Loose)
Tell-Tale Drain (optional)
Drain Connection, 7/8-in. OD
Air Vent, 1/8-in. MPT
Supply Connection
Supply Duct Collar, 1 inch
Return Connection
Mounting Holes (four, 3/4-in. diameter) have
Rubber Grommets with 3/8-in. holes.

a42-4120

Fig. 23 — 42DA Furred-In Ceiling Unit with Electric Heat Dimensions

26

UNIT
SIZE
06
08
10
12
14
16
18
20

NOM
AIRFLOW
(cfm)
600
800
1000
1200
1400
1600
1800
2000

DIMENSIONS (in. ± 1/8)
A
23
28
32
37
42
47
52
56

A’
32
37
42
47
52
56
62
66

B

D’

14
19
23
28
33
38
43
47

131/2
131/2
141/2
141/2
141/2
131/2
141/2
141/2

E
17
22
26
31
36
41
46
50

QTY/UNIT

F

G

H

Blower

Motor

UNIT
WEIGHT*
(lb)

21
26
30
35
40
45
50
54

251/4
301/4
341/4
391/4
441/4
491/4
541/4
581/4

181/2
231/2
271/2
321/2
371/2
421/2
471/2
511/2

1
1
1
2
2
2
2
2

1
1
1
2
2
2
2
2

94
107
150
169
174
178
195
220

1—
2—
3—
4—
5—

6—
7—
8—
9—
10 —
11 —
12 —
13 —
14 —
*Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other 15 —
components.
16 —
NOTES:
5
1. Right hand unit shown; left hand unit opposite. Coil connection locations are ± /8 inches.
2. Sizes 06, 08 and 10 have one motor, one blower. Sizes 12 through 20 have 2 motors, 2 blowers.
3. Filter and filter rack are standard.
4. Standard 4-row coil shown. Other coil option dimensional data available on request.
5. For optional coil connections, view 42DA-203-1 using the Fan Coil Builder.
6. Fan switch, wall plate not shown.
7. Galvanized finish provided as standard.
8. Dimensions are in inches (mm).

LEGEND
Motor Junction Box Opposite Piping
Insulated Return Air Plenum
Mounting Clips (Shipped Loose)
Electrical Strip Heater Element (optional)
Auxiliary Drip Lip (Shipped Loose) with 3/8-in.
Hole
Tell-Tale Drain (optional)
Drain Connection, 7/8-in. OD
Filter Retainer Angle
Access Panel
Return Duct Collar, 21/2 inches
Air Vent, 1/8-in. MPT
Return Connection
Filter, 1-in.
Supply Duct Collar, 1 inch
Supply Connection
Mounting Holes (four, 3/4-in. diameter) with
Rubber Grommet

A42-4121

Fig. 24 — 42DC Furred-In Ceiling Unit with Plenum and Electric Heat Dimensions

27

SEE NOTE 8

UNIT
SIZE
06
08
10
12
14
16
18
20

NOM
AIRFLOW
(cfm)
600
800
1000
1200
1400
1600
1800
2000

DIMENSIONS (in. ± 1/8)

QTY/UNIT

A

B

C

Blower

Motor

23
28
32
37
42
47
52
56

21
26
30
35
40
45
50
54

15
20
24
29
34
39
44
48

1
1
1
2
2
2
2
2

1
1
1
2
2
2
2
2

UNIT
WEIGHT*
(lb)
135
145
155
180
190
200
215
230

*Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other
components.
NOTES:
1. Right hand unit shown; left hand unit opposite. Coil connection locations are ± 5/8 inches.
2. Standard 4-row coil shown. Other coil option dimensional data available on request.
3. Sizes 06, 08 and 10 have one motor, one blower. Sizes 12 through 20 have 2 motors, 2 blowers.
4. Supply and return connections terminate within unit when valves are factory installed.
5. For optional coil connections, view 42DD-203-1 using the Fan Coil Builder.
6. Fan switch and wall plate are not shown.
7. Galvanized finish provided as standard.
8. Units with internal factory valve packages have external connections located in triangular section
above coil.
9. Consult Carrier for ducted front return air and external filter rack with 1-in. duct collar and throwaway
filters.
10. Units with electric heat require additional access on the side of unit for servicing contactor box.
11. With bottom return, access to filter is through the front access panel.
12. Dimensions are in inches (mm).

1—
2—
3—
4—
5—
6—
7—
8—
9—
10 —
11 —
12 —

LEGEND
Motor Junction Box
Air Vent, 1/8-in. MPT
Return Connection
Optional 6-in. Legs
Bottom Return (optional)
Return Air Opening
Supply Connection
Drain Connection, 7/8-in. OD
Front Access Panel
Filter, Throwaway
Electric Strip Heater Element (optional)
Supply Duct Connection, 1-in.

A42-4122

Fig. 25 — 42DD Vertical Unit with Full Casing and Electric Heat Dimensions

28

UNIT
SIZE
06
08
10
12
14
16
18
20

NOM
AIRFLOW
(cfm)
600
800
1000
1200
1400
1600
1800
2000

DIMENSIONS (in. ± 1/8)

QTY/UNIT

A

B

C

D

31
36
40
45
50
55
60
64

15
20
24
29
34
39
44
48

15
20
24
29
34
39
44
48

26
31
35
40
45
50
55
59

Blower Motor
1
1
1
2
2
2
2
2

1
1
1
2
2
2
2
2

UNIT
WEIGHT*
(lb)
150
160
170
195
205
215
230
235

*Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves,
and other components.
NOTES:
1. Right hand unit shown; left hand unit opposite.
2. Coil stub-out location data available on request.
3. Unit fabricated of galvanized steel.
4. Internal parts fabricated of galvanized steel.
5. Sizes 06, 08 and 10 have one motor, one blower. Sizes 12 through 20 have 2 motors,
2 blowers.
6. Units must have drain line pitched and trapped externally.
7. For optional coil connections, view 42DA-203-1 using the Fan Coil Builder.
8. Fan switch, wall plate not shown.
9. Galvanized finished provided as standard.
10. Dimensions are in inches (mm).

LEGEND
1 — Motor Junction Box
2 — Unit Mounting Channel (2), 14-gage; 4 Mounting
Slots, 1/2-in. x 2-in.
3 — Auxiliary Drip Lip (optional, shipped loose)
4 — Side Access Panels
5 — Electrical Strip Heater Element (optional)
6 — Supply Air Duct Connection, 1 in.
7 — Manual Air Vent
8 — Filter, Throwaway, 1-in.
9 — Return Air Duct Connection, 21/2 in.
10 — Drain, 7/8-in. OD
11 — Bottom Access Panel
12 — Drain Pan
13 — Coil Inlet, Copper Sweat Connection
14 — Coil Outlet, Copper Sweat Connection

A42-4123

Fig. 26 — 42DE Ceiling Unit with Full Casing and Electric Heat Dimensions

29

UNIT
SIZE
06
08
10
12
14
16
18
20

NOM
AIRFLOW
(cfm)
600
800
1000
1200
1400
1600
1800
2000

DIMENSIONS (in. ± 1/8)

QTY/UNIT

A

B

C

D

E

Blower

Motor

31
36
40
45
50
55
60
64

131/2
181/2
221/2
271/2
321/2
371/2
421/2
461/2

14
20
24
28
34
38
44
48

26
31
35
40
45
50
55
59

81/2
8
8
81/2
8
81/2
8
8

1
1
1
2
2
2
2
2

1
1
1
2
2
2
2
2

UNIT
WEIGHT*
(lb)
150
160
170
195
205
215
230
235

*Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other
components.
NOTES:
1. Right hand unit shown; left hand unit opposite.
2. Coil stub-out connection data available on request.
3. Units fabricated of galvanized steel with an Arctic White baked finish.
4. Internal parts fabricated of galvanized steel.
5. Sizes 06, 08 and 10 have one motor, one blower. Sizes 12 through 20 have 2 motors, 2 blowers.
6. Units must have drain line pitched and trapped externally.
7. Stamped supply and return grilles are not available.
8. Bottom return air is not available.
9. For optional coil connections, view 42DA-203-1 using the Fan Coil Builder.
10. Fan switch and wall plate are not shown.
11. Dimensions are in inches (mm).

LEGEND
1 — Junction Box
2 — Return Air Grille, Hinged, Bar Type, with Filter
Frame (Anodized Aluminum Only)
3 — Unit Mounting Channel (2), 14-gage; 4 Mounting
Slots, 1/2 in. x 2-in.
4 — Auxiliary Drip Lip
5 — Electric Strip Heater Element (optional)
6 — Coil Inlet, Copper Sweat Connection
7 — Coil Outlet, Copper Sweat Connection
8 — Manual Air Vent
9 — Filter, Throwaway
10 — Bottom Access Panel
11 — Drain, 7/8-in. OD
12 — Drain Pan Insulated with Styrofoam
13 — Side Access Panel (2)
14 — Supply Air Grille (Double Deflection)

A42-4124

Fig. 27 — 42DF Exposed Ceiling Unit with Supply and Return Grille and Electric Heat Dimensions

30

CR
CS
D
HR
HS
R
S

—
—
—
—
—
—
—

ITEM
1
2
3
4
5
6
7

LEGEND
Cold Water Return
Cold Water Supply
Drain
Hot Water Return
Hot Water Supply
Return
Supply

DESCRIPTION
Electrical Knockouts
3-in. Expanded Section
Strip Heater (Optional)
Limit Switch**†† (Optional)
1/ -in. Isolation Ball Valves**
2
Flexible Drain Tube/P-Trap
Coil 1/2-in. OD Copper Tube

8
9
10
11
12
13
14
15
16
17
18
19
20
21
22

Filter, Throwaway, 1-in.**
Return Air Opening
Air Vent, Manual
Molex Connector for Field-Installed Stat
Control Box
Knockout (For Optional Remote Mounting)
Riser, Supply and Return (Copper)
Riser, Drain (Copper)
Drain Pan
Return Air Blockoff Panel (Optional)
Blower
Motor, 3-Speed, PSC, with Quick Connect
Access Panel (Control Box)
Control Opening (Surface Mount Stat)
Duct Collar, 1/2-in. Extension (Typical)

23

Supply Air Opening(s)

QTY
1
3/5
1
1
2/4
1
1
1
1
1
1
1
2
2/4
1
1
1
1
1
1
1
1/2/3
1/2/3

*Drawing provided for reference only. Dimensions may vary with options ordered.
NOTES:
1. Units are fabricated of 18-gage galvanized steel with a 16-gage galvanized fan deck.
2. All risers are insulated with 1/2-in. closed cell insulation.
3. Thermostats shipped loose for field connection.
4. Risers are piped to coil with valves as specified.
5. Blower, motor, valves, coil, and filter are accessible through the return air opening.
6. Unit and control box are insulated with 1/2-in. coated fiberglass insulation.
7. Riser length = [(floor to floor) +2 in.], maximum riser length = 115 inches.
8. Maximum riser size is 21/2-in. diameter. If larger sizes are required, please consult the factory.
9. Expansion loops in hot water heating circuits as required.
10. A 9-in. x 21/4-in. slot is provided in the inside back panel for coil connection penetration to permit expansion
and contraction of risers. Care must be taken to position the risers so that coil connection is at center of slot.
11. Drawing is pictorial (see unit arrangements for actual supply and return air orientation).
12. All dimensions are in inches.

A42-4125

UNIT
SIZE

NOM
AIRFLOW
(cfm)

Single Supply
A
B
14
8

DIMENSIONS (in.)
Double Supply
Top Supply
A
B
C
D
14
6
14
10

E

G

H

I

UNIT
WEIGHT†
(lb)

03

300

17

11/2

11/2

14

180

04

400

14

12

14

6

14

10

17

11/2

11/2

14

225

06

600

18

10

18

6

16

12

20

1

2

18

240

08

800

18

12

18

6

16

12

20

1

2

18

260

10

1000

—

—

22

8

18

16

24

1

3

22

280

12

1200

—

—

22

8

18

16

24

1

3

22

305

†Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.

**Factory-Installed.
††Field-Installed.

Fig. 28 — 42SG Furred-In Stack Dimensions

31

CR
CS
D
HR
HS
R
S

—
—
—
—
—
—
—

ITEM
1

LEGEND
Cold Water Return
Cold Water Supply
Drain
Hot Water Return
Hot Water Supply
Return
Supply
DESCRIPTION
Full Riser Chase

2
3
4
5
6

Electrical Knockouts
3-in. Expansion Section
Strip Heater (Optional)
Limit Switch**†† (Optional)
1/ -in. Isolation Ball Valves**
2

7
8
9

Flexible Drain Tube/P-Trap
Drain Pan
Coil 1/2-in. OD Tube

10
11
12
13
14

Filter, Throwaway, 1-in.**
Air Vent, Manual
Control Box
Cabinet Camloc® Fasteners
3-Speed Switch

15
16
17
18
19

Electrical Access Panel
Riser, Supply and Return (Copper)
Riser, Drain (Copper)
Return Air Panel
Return Air Blockoff Panel (Optional)

20
Motor, 3-Speed, PSC
21
Blower
22
Thermostat
23
Hinged Control Access Door
24
Double Deflection Steel Core Grille Assembly
**Factory-Installed.
††Field-Installed.

QTY
1
1
3/5
1
1
2/4
1
1
1
1
1
1
2
1
1
2/4
1
1
1
1
1
1
1
1

*Drawing provided for reference only. Dimensions may vary with options ordered.
NOTES:
1. Units are fabricated of 18-gage galvanized steel with a 16-gage galvanized fan deck, painted with Arctic White.
2. 3-speed switch and thermostat are unit mounted.
3. Risers are piped to coil with valves as specified.
4. Blower, motor, valves, coil, and filter are accessible through the return air opening.
5. Unit is insulated with coated fiberglass.
6. Control box is insulated with 1/2-in. insulation for unit mounted controls.
7. Riser length = [(floor to floor) +2 in.], maximum riser length = 115 inches.
8. Maximum riser size is 21/2-in. diameter. If larger sizes are required, please consult the factory.
9. Expansion loops in hot water heating circuits as required.
10. A 9-in. x 21/4-in. slot is provided in the inside back panel for coil connection penetration to permit expansion and
contraction of risers. Care must be taken to position the risers so that coil connection is at center of slot.
11. Drawing is pictorial (see unit arrangements for actual supply and return air orientation).
12. 42SHA available in front return only.
13. All dimensions are in inches.

A42-4126

UNIT
SIZE

NOM
AIRFLOW
(cfm)

Single Supply
A
B
14
8

DIMENSIONS (in.)
Double Supply
C
D
A
B
14
6
17
223/8

E

F

G

UNIT
WEIGHT†
(lb)

03

300

11/2

221/8

143/4

202

04

400

14

12

14

8

17

223/8

11/2

221/8

143/4

247

06

600

14

12

14

8

20

253/8

2

265/8

173/4

262

08

800

14

16

14

10

20

253/8

2

265/8

173/4

286

10

1000

18

16

14

12

24

293/8

3

311/8

173/4

311

12

1200

18

16

14

12

24

293/8

3

311/8

173/4

336

†Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.

Fig. 29 — 42SH Cabinet Dimensions

32

CR —
CS —
D —
HR —
HS —
R —
S —
ITEM
1

LEGEND
Cold Water Return
Cold Water Supply
Drain
Hot Water Return
Hot Water Supply
Return
Supply
DESCRIPTION
Electrical Knockouts

2

Gypsum Board, 5/8-in. Type “X”

3
4
5
6
7

3-in. Expanded Section
Strip Heater**(Optional)
Limit Switch**†† (Optional)
1/ -in. Isolation Ball Valves**
2
Thermafiber Insulation
Flexible Drain Tube/P-Trap
Coil 1/2-in. OD Copper Tube

8
9

QTY
2
1
3/5
2
2
4/8
2
2

10
11
12
13
14
15
16
17
18
19

Filter, Throwaway, 1-in.**
Return Air Opening
Air Vent, Manual
Knockout (For Optional Remote Mounting)
Molex Connector for Field Installed Stat
Control Box
Riser, Drain (Copper)
Riser, Supply and Return (Copper)
Drain Pan
Return Air Blockoff Panel (Optional)

20
21
22
23
24

Blower
Motor, 3-Speed, PSC, with Quick Connect
Access Panel (Control Box)
Control Opening (Surface Mount Stat)
Duct Collar, 1/2-in. Extension (Typical)

25

Supply Air Opening(s)

2
2
2
2
2
2
2
1
2/4
2
1
2
2
2
2
1/2/3
1/2/3

*Drawing provided for reference only. Dimensions may vary with options ordered.
NOTES:
1. Units are fabricated of 18-gage galvanized steel with a 16-gage galvanized fan deck.
2. All risers are insulated with 1/2-in. closed cell insulation.
3. Thermostats shipped loose for field connection.
4. Risers are piped to coil with valves as specified.
5. Blower, motor, valves, coil, and filter are accessible through the return air opening.
6. Unit and control box are insulated with 1/2-in. coated fiberglass insulation.
7. Riser length = [(floor to floor) +2 in.], maximum riser length = 115 inches.
8. Maximum riser size is 21/2-in. diameter. If larger sizes are required, please consult the factory.
9. Expansion loops in hot water heating circuits as required.
10. A 9-in. x 21/4-in. slot is provided in the inside back panel for coil connection penetration to permit expansion
and contraction of risers. Care must be taken to position the risers so that coil connection is at center of slot.
11. Drawing is pictorial (see unit arrangements for actual supply and return air orientation).
12. All dimensions are in inches.

A42-4127

DIMENSIONS (in.)
Top Supply
E
C
D
14
10
17

UNIT
SIZE

NOM
AIRFLOW
(cfm)

03

300

04

400

14

12

14

6

14

10

17

06

600

18

10

18

6

16

12

08

800

18

12

18

6

16

10

1000

—

—

22

8

12

1200

—

—

22

8

Single Supply
A
B
14
8

Double Supply
A
B
14
6

G

H

I

J

UNIT
WEIGHT†
(lb)

11/2

11/2

14

401/4

360

11/2

11/2

14

401/4

450

20

1

2

18

461/4

480

12

20

1

2

18

461/4

520

18

16

24

1

3

22

541/4

560

18

16

24

1

3

22

541/4

610

†Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.

**Factory-Installed.
††Field-Installed.

Fig. 30 — 42SJ Back-to-Back Furred-In Stack Dimensions

33

CR —
CS —
D —
HR —
HS —
R —
S —

LEGEND
Cold Water Return
Cold Water Supply
Drain
Hot Water Return
Hot Water Supply
Return
Supply
*Drawing provided for reference only. Dimensions may vary with options ordered.
QTY NOTES:
1. Units are fabricated of 18-gage galvanized steel with a 16-gage galvanized fan deck.
1
2. All risers are insulated with 1/2-in. closed cell insulation.
3-in. Expanded Section
3/5
3. Thermostats shipped loose for field connection.
4. Risers are piped to coil with valves as specified.
Strip Heater** (Optional)
1
5. Blower, motor, valves, coil, and filter are accessible through the return air opening.
Limit Switch**†† (Optional)
1
6. Unit and control box are insulated with 1/2-in. coated fiberglass insulation.
1/ -in. Isolation Ball Valves**
7. Riser length = [(floor to floor) +2 in.], maximum riser length = 115 inches.
2/4
2
8. Maximum riser size is 21/2-in. diameter. If larger sizes are required, please consult the factory.
Flexible Drain Tube/P-Trap
1
9. Expansion loops in hot water heating circuits as required.
Coil 1/2-in. OD Copper Tube
1
10. A 9-in. x 21/4-in. slot is provided in the inside back panel for coil connection penetration to permit expansion
and contraction of risers. Care must be taken to position the risers so that coil connection is at center of slot.
Filter, Throwaway, 1-in.**
1
11. Drawing is pictorial (see unit arrangements for actual supply and return air orientation).
Return Air Opening
1
12. All dimensions are in inches.
Air Vent, Manual
1
DIMENSIONS (in.)
Knockout (For Optional Remote Mounting)
2
NOM
UNIT
UNIT
AIRFLOW
Single Supply
Double Supply
Top Supply
WEIGHT†
Molex Connector for Field-Installed Thermostat
1
SIZE
E
G
H
I
(cfm)
(lb)
A
B
A
B
C
D
Control Box
1
03
300
14
8
14
6
14
10
17
11/2
11/2
14
180
Riser, Supply and Return (Copper)
2/4
Riser, Drain (Copper)
1
04
400
14
12
14
6
14
10
17
11/2
11/2
14
225
Drain Pan
1
06
600
18
10
18
6
16
12
20
1
2
18
240
Return Air Blockoff Panel (Optional)
1
08
800
18
12
18
6
16
12
20
1
2
18
260
Blower
1
10
1000
—
—
22
8
18
16
24
1
3
22
280
Motor, 3-Speed, PSC, with Quick Connect
1
12
1200
—
—
22
8
18
16
24
1
3
22
305
Access Panel (Control Box)
1
Control Opening (Surface Mount Thermostat)
1
†Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.
Duct Collar, 1/2-in. Extension (Typical)
1/2/3
Supply Air Opening(s)
1/2/3

ITEM
DESCRIPTION
1 Electrical Knockouts
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23

A42-4128

**Factory-Installed.
††Field-Installed.

Fig. 31 — 42SGM Furred-In Master Stack Dimensions

34

CR —
CS —
D —
HR —
HS —
R —
S —

LEGEND
Cold Water Return
Cold Water Supply
Drain
Hot Water Return
Hot Water Supply
Return
Supply

ITEM
DESCRIPTION
1 Electrical Knockouts

9
10
11
12
13
14
15
16
17
18
19
20
21

QTY
1
Strip Heater** (Optional)
1
Limit Switch**†† (Optional)
1
1/ -in. Isolation Ball Valves**
2/4
2
Coil Stub Outs
2/4
Shipping Brace
2/4
Flexible Drain Tube/P-Trap
1
Coil 1/2-in. OD Copper Tube
1
Filter, Throwaway, 1-in.**
1
Return Air Opening
1
Air Vent, Manual
1
Knockout (For Optional Remote Mounting)
2
Molex Connector for Field-Installed Stat
1
Control Box
1
Drain Pan
1
Return Air Blockoff Panel (Optional)
1
Blower
1
Motor, 3-Speed, PSC, with Quick Connect
1
Access Panel (Control Box)
1
Control Opening (Surface Mount Thermostat)
1
Duct Collar, 1/2-in. Extension (Typical)
1/2/3

22

Supply Air Opening(s)

2
3
4
5
6
7
8

1/2/3

*Drawing provided for reference only. Dimensions may vary with options ordered.
NOTES:
1. Units are fabricated of 18-gage galvanized steel with a 16-gage galvanized fan deck.
2. All risers are insulated with 1/2-in. closed cell insulation.
3. Thermostats shipped loose for field connection.
4. Risers are piped to coil with valves as specified.
5. Blower, motor, valves, coil, and filter are accessible through the return air opening.
6. Unit and control box are insulated with 1/2-in. coated fiberglass insulation.
7. Riser length = [(floor to floor) +2 in.], maximum riser length = 115 inches.
8. Maximum riser size is 21/2-in. diameter. If larger sizes are required, please consult the factory.
9. Expansion loops in hot water heating circuits as required.
10. A 9-in. x 21/4-in. slot is provided in the inside back panel for coil connection penetration to permit expansion
and contraction of risers. Care must be taken to position the risers so that coil connection is at center of slot.
11. Drawing is pictorial (see unit arrangements for actual supply and return air orientation).
12. All dimensions are in inches.

A42-4129

DIMENSIONS (in.)
Double Supply
Top Supply
A
B
C
D
14
6
14
10

UNIT
SIZE

NOM
AIRFLOW
(cfm)

03

300

04

400

14

12

14

6

14

10

06

600

18

10

18

6

16

08

800

18

12

18

6

10

1000

—

—

22

12

1200

—

—

22

Single Supply
A
B
14
8

E

G

H

I

UNIT
WEIGHT†
(lb)

17

11/2

11/2

14

162

17

11/2

11/2

14

203

12

20

1

2

18

216

16

12

20

1

2

18

234

8

18

16

24

1

3

22

252

8

18

16

24

1

3

22

275

†Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.

**Factory-Installed.
††Field-Installed.

Fig. 32 — 42SGS Furred-In Slave Stack Dimensions

35

Item
1
2
3

Description
Float Switch (Optional)
Drain Pan
Flexible Drain Tube/P-Trap

4

Drain Knockout (3 Sides)

5
6
7
8

Blower
Riser Knockouts (3 Sides)
1/2 in. Flare Adaptor (SWT x 37.5)
Coil, 1/2 in. OD Copper Tube
1 in. Throwaway Filter
(Factory Installed)
Manual Air Vent
Return Air Opening
Knockout (For Optional Thermostat
Remote Mounting)
Molex Connector for Field-Installed
Thermostat
Control Box
Duct Collar Extension
(1/2 in. Side, 1 in. Top)
Outside Air Knockout
(On Each Side Panel)
Electrical Knockouts
(Near Each Side)
Service Switch (Optional)
Motor, 3-Speed, PSC, with Quick
Connect
Coil Blockoff Plate
Access Panel (Control Box)
Control Opening Knockout
(Surface Mount Thermostat)
Supply Air Openings
(4 Sides and Top, Stitch Cut)

9
10
11
12
13
14
15
16
17
18
19
20
21
22
23

3
(76)
3-5/8
(92) HR

Qty
1
1
1
1 each
side
1
2/4
2/4
1

D CR

1-1/4
(32)

CS

1

23

C

H

A

F

16

—
—
—
—
—
—
—

CL

15

3

B

1
1
1/2/3

14

22

13

1
1

21

18

1
1

88
(2235)

12

20
H H
R S

1

C C
R S

1/2/3

11
7

10

63
(1600)

51
(1295)
39
(991)

8

LEGEND
Cold Water Return
Cold Water Supply
Drain
Hot Water Return
Hot Water Supply
Permanent Split Capacitor
Sweat

UNIT
WEIGHT* lb
(kg)

03

360 (163)

04

450 (204)

06

480 (218)

08

520 (236)

10

560 (254)

12

610 (277)

5
6

19

1
1

5
(127)

8
(203)
I
E

E

NOTES:
1. Units are fabricated of 18-gage galvanized steel with a 16-gage galvanized fan deck.
2. Thermostats shipped loose for field connection.
3. Blower, motor, valves, coil, and filter are accessible through the return air opening.
4. Unit and control box are insulated with 1/2-in. (13 mm) coated fiberglass insulation.
5. All risers will ship separately from units. Riser dimensions are measured from centerline of knockout.
6. Drain knockouts on three sides of cabinet.
7. Flex hoses ship with unit.
8. Thread fittings on both ends of flex hoses must be field tightened and leak tested.
9. Return air panel not shown.
10. All dimensions are in inches (mm).

UNIT
SIZE

4

5
(127)

9

CR
CS
D
HR
HS
PSC
SWT

3

4
(102)

1-1/4
(32)

17
H

2
1-1/4
(32)

D

1
1
1

HS

3
(76)
3-5/8
(92)

a42-4154

DIMENSIONS, in. (mm)
Side Supply

FILTER SIZE
in. (mm)

Top Supply

A

B

Size

C

D

Size

E

F

H

I

14 (356)

12 (305)

14 x 12
(356 x 305)

14 (356)

10 (254)

14 x 10
(356 x 254)

17 (432)

3 (76)

11/2 (38)

14 (356)

121/2 x 241/4 x 1
(318 x 616 x 25)

18 (457)

12 (305)

18 x 12
(457 x 305)

16 (406)

12 (305)

16 x 12
(406 x 305)

20 (508)

1 (25)

2 (51)

18 (457)

161/4 x 263/4 x 1
(413 x 679 x 25)

22 (559)

16 (406)

22 x 16
(559 x 406)

18 (457)

16 (406)

18 x 16
(457 x 406)

24 (610)

1 (25)

3 (76)

22 (559)

201/2 x 291/4 x 1
(521 x 743 x 25)

*Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.

Fig. 33 — 42SU Universal Furred-In Stack Dimensions

36

3
(76)
3-5/8
(92) HR

HS

D CR CS

3
(76)
3-5/8
(92)

1

1-1/4
(32)

2

1-1/4
(32)

D

19
H

C

H

25

A

F

5
(127)

18

17

24

5

16
15
88
(2235)

8

5
6
7
8
9
10

9

11

Limit Switch (Factory Installed)
Strip Heater
Blower
Riser Knockouts (3 Sides)
1/2 in. Flare Adaptor (SWT x 37.5)
Coil, 1/2 in. OD Copper Tube
1 in. Throwaway Filter
(Factory Installed)
Manual Air Vent
Return Air Opening
Knockout (For Optional
Thermostat Remote Mounting)
Molex Connector for
Field-Installed Thermostat
Control Box
Duct Collar Extension
(1/2 in. Side, 1 in. Top)
Outside Air Knockout
(On Each Side Panel)
Electrical Knockouts
(Near Each Side)
Service Switch (Optional)
Motor, 3-Speed, PSC,
with Quick Connect
Coil Blockoff Plate
Access Panel (Control Box)
Control Opening Knockout
(Surface Mount Thermostat)
Supply Air Openings
(4 Sides and Top, Stitch Cut)

7

13

C C
R S

12

63
(1600)

11

12
13

51
(1295)
39
(991)

10

I
E
CR
CS
D
HR
HS
PSC
SWT

—
—
—
—
—
—
—

14
15
16

5
(127)

8
(203)

17
18

E

19

LEGEND
Cold Water Return
Cold Water Supply
Drain
Hot Water Return
Hot Water Supply
Permanent Split Capacitor
Sweat

20
21
22
23
24

NOTES:
1. Units are fabricated of 18-gage galvanized steel with a 16-gage galvanized fan deck.
2. Thermostats shipped loose for field connection.
3. Blower, motor, valves, coil, and filter are accessible through the return air opening.
4. Unit and control box are insulated with 1/2-in. (13 mm) coated fiberglass insulation.
5. All risers will ship separately from units. Riser dimensions are measured from centerline of
knockout.
6. Drain knockouts on three sides of cabinet.
7. Flex hoses ship with unit.
8. Thread fittings on both ends of flex hoses must be field tightened and leak tested.
9. Return air panel not shown.
10. All dimensions are in inches (mm).

UNIT
SIZE

UNIT
WEIGHT*
lb (kg)

03

360 (163)

04

450 (204)

06

480 (218)

08

520 (236)

10

560 (254)

12

610 (277)

Description
Float Switch (Optional)
Drain Pan
Flexible Drain Tube/P-Trap
Drain Knockout (3 Sides)

21
H H
R S

Item
1
2
3
4

6

14

20

22

4

CL

B

23

3

4
(102)

1-1/4
(32)

25

Qty
1
1
1
1 each
side
1
1
1
2/4
2/4
1
1
1
1
3
1
1
1/2/3
1
1
1
1
1
1
1
1/2/3

a42-4155

DIMENSIONS, in. (mm)
Side Supply
B
Size

A

C

FILTER SIZE
in. (mm)

Top Supply
Size
E

D

F

14 (356) 10 (254)

14 x 10
(356 x 254)

17 (432)

3 (76)

H

I
121/2 x 241/4 x 1
(318 x 616 x 25)

14 (356)

12 (305)

14 x 12
(356 x 305)

18 (457)

12 (305)

18 x 12
(457 x 305)

16 (406) 12 (305)

16 x 12
(406 x 305)

20 (508)

1 (25)

2 (51)

18 (457)

161/4 x 263/4 x 1
(413 x 679 x 25)

22 (559)

16 (406)

22 x 16
(559 x 406)

18 (457) 16 (406)

18 x 16
(457 x 406)

24 (610)

1 (25)

3 (76)

22 (559)

201/2 x 291/4 x 1
(521 x 743 x 25)

11/2

(38) 14 (356)

*Unit weights are based on dry coils and minimum rows. Weights exclude packaging, valves, and other components.

Fig. 34 — 42SU Universal Furred-In Stack with Heater Dimensions

37

a42-4167

A

PANEL DIMENSIONS (in.)
PANEL NO.

UNIT SIZE
03, 04
06, 08
10, 12

A
15.5
19.5
23.5

2

03, 04
06, 08
10, 12

15.5
19.5
23.5

3

03, 04
06, 08
10, 12

15.2
19.2
23.2

6

03, 04
06, 08
10, 12

15.5
19.5
23.5

7

03, 04
06, 08
10, 12

15.1
19.1
23.1

8

03, 04
06, 08
10, 12

15.5
19.5
23.5

10

03, 04
06, 08
10, 12

15.2
19.2
23.2

1

A

A

61.1

55.3

55.5

NOTE: Dimensions in inches.

PANEL NO. 3

PANEL NO. 2

PANEL NO. 1

A42-4173

a42-4169
A

A

A

61.1

A

60.4
52.5

PANEL NO. 6

A42-4171

52.3

PANEL NO. 8

PANEL NO. 7

A42-4160

A42-4172

PANEL NO. 10

A42-4162

Fig. 35 — Return-Air Wall Panels for Furred-In Units — Panels with No Frame
38

PANEL AND FRAME DIMENSIONS (in.)
PANEL NO.

UNIT SIZE
03, 04
06, 08
10, 12

A
15.1
19.1
23.1

5

03, 04
06, 08
10, 12

15.1
19.1
23.1

9

03, 04
06, 08
10, 12

15.1
19.1
23.1

4

A42-4170

NOTE: Dimensions in inches.

A42-4168

A

A42-4161
A
A

60.4
54.7
51.7

PANEL NO. 4

PANEL NO. 5

PANEL NO. 9

Fig. 36 — Return-Air Wall Panels for Furred-In Units — Panels with Frame

39

7. Adjust 42VA, VB, VC, VE, VF units leveling legs so unit
is level. Unit must be level for proper operation and
condensate drainage.
8. Mounting unit:
a. Use rods and fasteners to suspend the unit at the
factory-provided mounting holes with rubber
grommets on the top of the unit on 42VA, VB, VF
units. Reach into unit and attach unit to the wall
using the 0.375-in. mounting holes (4) in top
panel; do not use any other locations. The four
mounting holes and hanger slots with rubber
grommets are NOT for balancing unit.
b. On 42VG unit ensure unit is placed snug within
the wall.
c. On 42VC, VE unit ensure unit is flushed against
the wall.
NOTE: For any unit without a return-air duct connection,
applicable installation codes may limit unit to installation in
single story residence only.
42D UNITS

INSTALLATION
Step 1 — Place Units in Position
42C UNITS
1. Select the unit location. Allow adequate space for free air
circulation, service clearances, piping and electrical
connections, and any necessary ductwork. For specific
unit dimensions, refer to Fig. 1-14. Allow clearances according to local and national electric codes.
2. Make sure ceiling is able to support the weight of the unit.
See Table 1 for nominal unit weight.
3. Ensure bottom panel has been removed from 42CG, CK
units with mounting holes. When unit is lifted, access to
the 0.375-in. mounting holes is through the bottom of the
unit. Hanger rods and fasteners and other required hardware must be field-supplied.
4. Move unit into position. Ensure unit is level or pitched
towards drain to ensure proper drainage and operation.
Pitch of suspended unit can change after coil is filled;
recheck after filling coil.
5. Mounting unit:
a. Use rods and fasteners to suspend the unit at the
factory-provided mounting holes with rubber
grommets on the top of the unit on 42CG, CK
units. Reach into unit and attach unit to the ceiling
using the 0.375-in. mounting holes (4) in top
panel; do not use any other locations.
b. Use rods and fasteners to suspend the unit at the
factory-provided 0.375-in. hanger slots (4) with
rubber grommets on the top of the unit on the
42CA, CE, and CF units.
NOTE: The four mounting holes and hanger slots
with rubber grommets are NOT for balancing unit.
6. 42CA and 42CF units without plenums and 42CE and CF
with bottom inlet may be installed in noncombustible
areas only.
NOTE: The installation of horizontal concealed units must
meet the requirements of the National Fire Protection Association (NFPA) Standard 90A or 90B concerning the use of concealed ceiling space as return-air plenums.
42V UNITS
1. Select the unit location. Allow adequate space for free air
circulation, service clearances, piping and electrical
connections, and any necessary ductwork. For specific
unit dimensions, refer to the submittals. Allow clearances
according to local and national electric codes.
2. Make sure the floor is able to support the weight of the
unit. See Table 2 for nominal unit weight.
3. Ensure wall behind unit is smooth and plumb; if
necessary, install furring strips on walls with irregular
surfaces or mullions. Furring strips must be positioned
behind mounting holes in unit (42VA, VB, VF units).
Fasteners, furring strips, and other seals (if required) must
be field-supplied.
4. Remove all wall and floor moldings from behind the unit.
5. Ensure 42VA top panel (under window application) and
42VB, VF front panel has been removed from unit to
obtain access to the four 0.75-in. mounting holes. Hanger
rods and fasteners and other required hardware must be
field-supplied.
6. Move unit into position. Ensure unit is level or pitched
towards drain to ensure proper drainage and operation.
Pitch of suspended unit can change after coil is filled;
recheck after filling coil.

1. Select the unit location. Allow adequate space for free air
circulation, service clearances, piping and electrical connections, and any necessary ductwork. For specific unit
dimensions, refer to the submittal drawings. Allow clearances according to the local and national electrical codes.
2. Be sure either the ceiling (42DA, DC, DE, and DF units)
or floor (42DD unit) is able to support the weight of the
unit. See Table 3 for nominal unit weight.
3. Move unit into position. Ensure unit is level or pitched
towards drain to ensure proper drainage and operation.
See Fig. 23-27. Pitch of suspended unit can change after
coil is filled; recheck after filling coil.
4. Mounting units to the ceiling:
a. When unit is lifted, access to the 0.375-in. mounting holes is on the top panel of the unit. Hanger
rods and fasteners and other required hardware
must be field-supplied.
b. Use rods and fasteners to suspend the unit at the
factory-provided mounting holes with rubber
grommets on the top of the unit. Attach unit to the
ceiling using the 0.375-in mounting holes (4) in
top panel; do not use any other locations.
c. Use the rods and fasteners to suspend the unit at
the factory-provided 0.375-in. hanger slots (4)
with the rubber grommets on the top of the unit on
the 42DA, DC, DE, and DF units.
NOTE: The four mounting holes and hanger slots
with rubber grommets are NOT for balancing unit.
d. Models 42DA and 42DC with bottom inlet may be
installed in noncombustible return spaces only.
5. Mounting units on the floor:
a. Ensure wall behind the unit is smooth and plumb;
if necessary, install furring strips on walls with
irregular surfaces or mullions. Furring strips must
be positioned behind mounting holes on 42DD
units. Fasteners, furring strips, and other seals (if
required) must be field-supplied.
b. If the unit has leveling legs, adjust them correctly
to level the unit.
6. Protect units from damage caused by jobsite debris. Do
not allow foreign material to fall in unit drain pan.
Prevent dust and debris from being deposited on motor or
fan wheels.

40

42S UNITS — A factory tag is on top of each unit. Tag states
riser tier number, floor, room number if furnished and supplyair arrangement. Check unit for any other labels that apply to
installation. Remove unit from pallet and take directly to
assigned space for installation. Great care must be taken to
assure that no force or pressure be applied to the coil, risers or
piping during handling. Never use the riser to lift the unit. To
maintain the straight and square cabinet alignment, avoid lifting or supporting the cabinet only at the top and bottom.
1. Begin on lowest floor and progress upward, floor by
floor, to top.
2. Examine drain line (Fig. 28-34). Be sure both ends are in
place and that it forms a trap. Avoid pinching drain line.
3. Tip unit over riser hole in building floor. As unit is
righted, align riser with unit below.
NOTE: The unit must be lowered into the space taking
care to properly align the risers to engage the riser swaged
section on the unit below. The riser should never be bent
or pushed together to be passed through the floor slot and
should never be lifted up or pulled down to meet the riser
on the floor below or above.
4. Install isolator pads beneath the four corners of unit if
applicable.
5. Before anchoring the equipment in place, the unit must be
leveled and the cabinet must be squared and brought into
line with any adjacent or included walls. The unit may be
anchored in place by bolting directly through the unit
floor or attaching to the cabinet in some location that will
not interfere with drywall or other items such as the supply grille, thermostat, or return access panel. When attaching to the unit cabinet, care must be taken to not penetrate the cabinet in locations that may damage internal
components or wiring. The mounting technique is a matter of choice; however, the unit should always be anchored securely to prevent movement during construction
and riser expansion and contraction. On certain units,
shipping screws or braces must be removed after the unit
is installed. Be sure to check all tags on the unit to determine which, if any, of these devices need to be removed.
6. If installing a 42SJ unit, follow Steps a-h. For all other
42S units, continue to Step 7.
NOTE: The 42SJ back-to-back fan coils have been designed to serve two separate rooms. These products are
classified by Underwriters Laboratories Inc. for use in
penetration firestop systems, control number 27WL when
ordered with 1-hr rated chase. See UL Fire Resistance
Directory for more information. Figure 37 shows the
42SJ unit with standard risers and with Siamese risers.
a. Lay out the control lines for the drywall track and
studs in the floor and ceiling (see Fig. 38).

CHASE
SIDE
PANEL

DRYWALL
TRACK AND
STUD
CONTROL
LINES

INSTALL STUDS FROM TOP OF
UNIT TO CEILING (4 CORNERS)

Fig. 38 — 42SJ Unit as Shipped

b.
c.
d.

e.
f.

g.

NOTE: Tracking may be installed now or after the
unit is set.
Position the 42SJ fan coil assembly between two
rooms with the unit drywall separation spotted
over the wall control lines.
If not already installed, install the floor and ceiling
tracks up to and over the 42SJ fan coil unit.
Position the vertical studs and fasten into each of
the stud pockets formed into the chase side panels
(see Fig. 38).
NOTE: The studs may be mechanically fastened
to the 42SJ fan coil. Care should be taken, however, not to penetrate the supply or return water
risers or internal piping. Given the levelness of the
floor and/or the fan coil assembly, some shimming
may be necessary.
Assemble the specified wall construction up to
and over the top of the fan coil unit (see Fig. 39).
With the fire-wall separation being complete, the
drywall skin on the surface of the individual fan
coils can be applied. Drywall can be applied
directly to the surface, or, if necessary, studding
may be installed on the corners for vertical control
(see Fig. 39).
For ease of installation of the access panel, apply
drywall on the return air side directly to the surface of the unit (see Fig. 39). When applying the
wall board directly to the unit cabinet, it may be
necessary to shim the wall board in some areas to
achieve the desired finished wall surface.

WALL STUDS

42SJA

42SJA

42SJB

42SJB

INSTALL WALL
STUD INTO
POCKET
FORMED BY
CHASE SIDE
PANEL

INSTALL
GYPSUM
BOARD TO
FACE OF
UNIT WITH
CUT OUTS
FOR SUPPLY,
RETURN AND
THERMOSTAT

Fig. 37 — 42SJ Unit with Standard and Siamese
Risers

INSTALL WALL
GYPSUM
BOARD
(TO WALL AND
OVER TOP OF
UNIT)

INSTALL
GYPSUM
BOARD TO
UNIT SIDES

Fig. 39 — 42SJ Unit Installation
41

h. After all drywalling and painting is complete,
install thermostats, supply air grilles and return air
panels.
7. Attach unit risers:

IMPORTANT: Chilled water and hot water risers should
never be piped to drain down into the condensate riser.
Extensive water damage can occur due to drain overflow. Drain chilled and hot water risers to a remote location away from the unit such as sink, room and floor
drains.

CAUTION

8. Anchor risers as required:
a. Do not fasten risers rigidly within each unit.
Risers must be free to move within pipe chase
in response to normal vertical expansion and
contraction.
b. Built in risers must be anchored at some point
to building structure. Unit design accommodates
up to 11/2-in. expansion and contraction in riser
assemblies when positioned properly at the job
site. Risers must be anchored to the building structure to limit expansion and contraction movement
to a maximum of 11/2-inches. Riser anchoring and
expansion compensation is not included in the factory-supplied unit and must be provided.
9. Test the system for leaks after the connections are completed. When testing with air or some other gas, it might
be necessary to tighten stem packing nuts on some valves
to maintain air pressure in the riser. Pressure testing risers
with water should be done with the unit service valves
closed to prevent flushing debris into the unit valve packages. This will also allow risers to be drained down after
testing in the winter to avoid freeze-up problems.
10. After system integrity has been established, pull the riser
insulation back into place over the joint and glue or seal
to prevent sweating and heat loss or gain. Internal chilled
water piping and valves are located over the drain pan
and need not be insulated.
11. If required, fireproof were necessary. Any fireproofing requirements where risers or piping penetrate floors or
walls are the responsibility of the installer. This work
should be done only after all pressure testing is completed. The fireproofing method used must accommodate
pipe expansion and contraction and the piping must be
protected from abrasion and chemical attack. The pipe insulation also must be maintained to prevent sweating and
must be protected from wear or erosion at the joint between the insulation and the fireproofing material.

Toxic residues and loose particles resulting from manufacturing and field piping techniques such as joint compounds,
soldering flux, and metal shavings may be present in the
unit and the piping system. Special consideration must be
given to system cleanliness when connecting to solar,
domestic or portable water systems. Failure to heed this
warning could result in equipment damage.
NOTE: The supply and return connections are marked on
the coil stub-outs and the valve package with an “S”
meaning supply or inlet and “R” meaning return or outlet
indicating flow direction to and from the coil. Blue letters
mark the chilled water connections and red letters mark
the hot water connections.
a. Each riser has a 3-in. swaged portion at top and
sufficient extension at bottom for an inserted
length of approximately 2-in. This unit-to-unit
joint is NOT intended for full bottoming in the
joint, but allows for variations in floor-to-floor
dimensions and for correct riser positioning.
If job requires that unit risers be supplemented
with between-the-floor extensions pieces may be
field-supplied or factory-supplied. If factorysupplied, insulation is also provided.
b. Level unit to ensure proper coil operation and
condensate drainage. Proper riser installation and
vertical positioning in the unit provides for a unit
piping run-out to the service valves which are centered in the access slots and level or sloping down
slightly away from the riser. This prevents condensation from running back to the riser and possible damage from dripping at the bottom of a
riser column. After units are positioned and riser
centered in pipe chase, make unit plumb in two
directions, using unit frame as a reference.
c. Anchor unit to building. Use bolts or lag screws
through holes provided in unit frame.
d. After all units in a stack are anchored, make unitto-unit riser joints. First, center each coil-to-riser
line within the expansion slot in the unit back
panel. Each riser joint must be in vertical
alignment with at least 1-in. penetration into the
swaged joint. This condition is met if floor-tofloor dimension is as specified and coil-to-riser
lines are properly centered. Wide variations in
floor-to-floor dimensions may necessitate cutting
off or extending individual risers. Such modifications are the full responsibility of the installing
contractor.
e. Before making the riser joints, the riser insulation
must be pulled back away from the joint and protected from heat during the soldering process. Solder riser joints with phos-copper, silfos, or other
high temperature alloy. The riser joint filler material must be selected to withstand the total operating pressure (both static and pumping head) to
which the system will be subjected. Soft solder
(50-50, 60-40, or 85-15) or other low temperature
lead alloy is not suitable for this application.

Step 2 — Make Piping Connections — Access to
piping is available through the access panels at the side of the
units or front of the unit. Qualified personnel in accordance
with local and national codes must perform all piping connections. Refer to Tables 1-4 for piping connections.
NOTE: It is important to have a common understanding of
which side of the unit is the right hand side and which is the
left hand side.
When facing the supply air outlet from the front of the unit
(air blowing in your face), your right hand will be on the right
side of the unit and your left hand will be on the left side of the
unit. See Fig. 40. Refer to Fig. 41 and 42 for typical piping
connections.
The supply and return piping connections of the factoryprovided valve package are either swaged for field brazing
(standard) or union fitted (optional) for field connection to the
coil.

42

VALVE PACKAGES — There are limitations on physical
size of pneumatic valves, quantity and type of matching
components, and required control interface. See Fig. 43.
Consult factory before ordering any special valve package
components that are not covered in this book.
Valve packages are shipped with the units or in unit cartons.
Valve packages include belled ends for field soldering to coil
connections.
All factory-furnished cooling valve packages are arranged
to position as much of the package as possible over an auxiliary
drain pan or drip lip. This helps minimize field piping insulation requirements. Refer to Fig. 44-47 for pipe connection
configurations. See Table 5 for descriptions of common piping
components.

Fig. 40 — Unit End Reference

NOTE: Chilled water piping determines the hand of the unit.

NOTE: Chilled water piping determines the hand of the unit.

SAME END CONNECTION

OPPOSITE END CONNECTION

Valve Packages For 2-Pipe Systems — Valve packages for standard 2-pipe units are piped for same end
connection (L.H. or R.H.).

Valve Packages for 4-Pipe Systems — Select 2 valve packages per unit.
NOTE: Hot water valve package requirements may not be the same as chilled water valve package!

SAME END CONNECTION

OPPOSITE END CONNECTION
LEGEND
CW — Chilled Water
HW — Hot Water
LH — Left Hand
RH — Right Hand

Fig. 41 — Pipe Connection Configurations
43

Hydronic Coil Arrangement

Field Piping Connections*
VERTICAL FLOOR UNITS — 42VB, VE, VF
Pipe into cabinet end compartment (opening in bottom and
back).

VERTICAL FLOOR UNITS — 42VA, VC
Pipe to external connections (no cabinet).

CEILING UNITS (EXPOSED) — 42CG, CK, DE, DF
Pipe through knock-outs in rear of cabinet to coil and valve
package connections.

CEILING UNITS (CONCEALED) — 42CA, CE, CF, DA, DC
Pipe to connections extending from end of unit.

VERTICAL UNITS — 42DD
Pipe to stub connections extending from side of unit.

42VG

WALL UNITS, FURRED-IN
Pipe to stub connections at the side of unit.

a42-4177

or into optional piping compartment. Optional piping compartment is required if valves are factory installed. Factory-installed
valve package is limited to one 2-way or 3-way motorized valve
and 2 hand valves.

42VG

*Location of field piping connections will vary depending on number of coil rows on factory-supplied coil or
arrangement of factory-supplied valves.

Fig. 42 — Piping Connection Positions

44

Coil Connections (Positions A & B) — When isolation valve only is added to supply or return line, the isolation valve will
be factory brazed to the coil stub-out. Addition of any other component or connection to the supply or return line will change
the respective coil connection(s).
Service Fittings (Positions C & D) — Optional fittings for attaching pressure/temperature sensing devices to obtain pressure drop or temperature differential across coil. Used with ball valve or balance valve where extremely accurate water flow
balancing is required.
Water Flow Balancing (Positions E, F, & H) — Only one device per total valve package to be used for balancing water
flow through the coil. When isolation valve (ball valve or ball valve with memory stop at position H) is used for water flow balancing, do not specify additional balancing device at position E or F. When balancing device is specified at position E or F,
isolation valve does not require balancing feature at position H (with a 3-way motorized valve, a bypass balancing valve
may be specified in the bypass line to permit equal flow balancing).
Strainer (Position G) — Does not include blow down fitting and should not be used in lieu of main piping strainers.
Isolation Valves (Positions H & J) — Normally requires one each on supply and return line (see exception under circuit
setter). When position H is used for balancing (ball valve or ball valve with memory stop), check specifications for service
valve requirements.

Fig. 43 — Symbols and Placement of Valves

45

The 2-way motorized valve motor drives valve open and a
spring returns valve to normally closed position (no water
flow with unit OFF).
Supply connection at coil will be swage fit for field braze
(standard) or union (option). Return connection at coil will
be factory brazed if isolation valve only. Addition of any
other component will require swage fit for field braze or
optional union connection.
Check job specifications for system pressure, pressure drop
limitations and flow rate prior to selecting valve package
components or valve package size (1/2in., 3/4 in., etc.).
2-PIPE SYSTEM (One Valve Package) or 4-PIPE SYSTEM
(Two Valve Packages) Application:
• 2 Pipe — Hydronic Heating Only
• 2 Pipe — Hydronic Cooling Only
• 2 Pipe — Hydronic Cooling with Total Electric Heat
• 4 Pipe — Hydronic Cooling and Heating
NOTE: A 1/4-in. bypass line is included in the piping package when a 2-way valve is specified with a control package
containing an automatic changeover device.

a42-4174

MOTORIZED
M

LEGEND
Ball Valve
Motorized 2-Way Valve

Fig. 44 — Two-Way Motorized Control Valve Package
a42-4175
The 2-way motorized valve motor drives valve open and a
spring returns valve to normally closed position (no water
flow through coil with unit OFF).
The aquastat bleed bypass bleeds a small amount of water
from supply to return when control valve is closed (required
for system water temperature sensing by aquastat).
Aquastat (A) clips on supply line upstream from aquastat
bleed bypass (as shown at right). It senses system water
temperature to prevent cooling operation with hot water in
system piping or heating operation with chilled water in
system piping. Additional aquastat required to lock out the
optional auxiliary electric heat when hot water in system.
Supply and return connections at coil will be swage fit for
field braze (standard) or unions (option).
Check job specifications for system pressure, pressure drop
limitations and flow rate prior to selecting valve package
components or valve package size (1/2in., 3/4 in., etc.).
2-PIPE SYSTEM (One Valve Package) Application:
• 2 Pipe — Hydronic Cooling and Heating
• 2 Pipe — Hydronic Cooling and Heating with Auxiliary
Electric Heat
NOTES: Additional aquastat required as noted above.

MOTORIZED
M

BALL VALVE
(1) GATE
(1) BALL
(1) 2-WAY MOTORIZED

R
MOTORIZED
2-WAY VALVE
M

COIL
S

GATE
SHUT OFF

A

BYPASS

BALL VALVE
(2) BALL
(1) BALANCING
(1) 2-WAY MOTORIZED

R

COIL

BALANCING
VALVE

BALL VALVE

M

BYPASS

S

LEGEND

MOTORIZED
2-WAY VALVE

Balancing Valve

A

CIRCUIT SETTER

Ball Valve

(1) BALL
(1) CIRCUIT SETTER
(1) 2-WAY MOTORIZED

Circuit Setter
Gate Shut Off Valve

R
MOTORIZED
2-WAY VALVE
M

COIL

Motorized 2-Way Valve

S

BALL VALVE
A

BYPASS

Fig. 45 — Two-Way Motorized Control Valve Package with Aquastat Bleed Bypass Line

46

On the 3-way motorized valve flow is normally closed to coil
and open to system return. Motor closes bypass flow to system return while opening flow through coil. Water bypasses
coil and flows directly to system return when unit is OFF.
The aquastat (A) clips on supply line upstream from 3-way
valve (as shown above). It senses system water temperature to prevent cooling operation with hot water in system
piping or heating operation with chilled water in system piping. Aquastat(s) required for 2-pipe cooling and heating with
automatic changeover control and/or auxiliary electric heat.
A bypass balancing valve may be specified in the bypass
line to permit equal flow balancing.
Supply and return connections at coil will be swage fit for
field braze (standard) or unions (option).
Check job specifications for system pressure, pressure drop
limitations and flow rate prior to selecting valve package
components or valve package size (1/2in., 3/4 in., etc.).
2-PIPE SYSTEM (One Valve Package) or 4-PIPE SYSTEM
(Two Valve Packages) Application:
• 2 Pipe — Hydronic Heating Only
• 2 Pipe — Hydronic Cooling Only
• 2 Pipe — Hydronic Cooling with Total Electric Heat
• 2 Pipe — Hydronic Cooling and Heating
• 2 Pipe — Hydronic Cooling and Heating with Auxiliary
Electric Heat
• 4 Pipe — Hydronic Cooling and Heating

a42-4176

MOTORIZED
M

BALANCING
VALVE
(1) BALL
(1) 3-WAY MOTORIZED

MOTORIZED
3-WAY VALVE

R
M

COIL

(2) BALL (ONE WITH
MEMORY STOP)
(1) 3-WAY MOTORIZED

S

R

(1) GATE
(1) BALL
(1) 3-WAY MOTORIZED

LEGEND

COIL

Balancing Valve

BYPASS

BALL VALVE

MOTORIZED
3-WAY VALVE
M

COIL

BALL VALVE

S

BALL VALVE
(WITH MEMORY STOP)
M
BYPASS

BALL VALVE

MOTORIZED
3-WAY VALVE

BALL VALVE

R
M

BYPASS

GATE
SHUT OFF VALVE

S

Ball Valve

M

Ball Valve with Memory Stop
Circuit Setter

BALL VALVE
(2) BALL
(1) BALANCING
(1) 3-WAY MOTORIZED

Gate Shut Off Valve
Motorized 3-Way Valve

COIL

R

BALANCING
VALVE
M

S

BYPASS

BALL VALVE
MOTORIZED
3-WAY VALVE

*When aquastat is used for automatic changeover, bypass is
required as indicated by dashed line.
NOTES:
1. Packages factory furnished and installed.
2. Valves are 5/8-in. ODS unless otherwise specified.
3. If an automatic flow control valve is added, it will be
located on supply line between shutoff valve and coil (or
motorized control valve, if supplied).

(1) BALL
(1) CIRCUIT SETTER
(1) 3-WAY MOTORIZED

MOTORIZED
3-WAY VALVE

R
M

COIL

S

Fig. 46 — Three-Way Motorized Control Valve Package

47

CIRCUIT SETTER

BYPASS

BALL VALVE

When isolation valves only are specified, they will be brazed
to the coil stub-outs.
Check job specifications for system pressure, pressure drop
limitations and flow rate prior to selecting specific components or valve package size (1/2 in., 3/4 in., etc.).
2-PIPE SYSTEM ONLY (One Valve Package) Application:
• 2 Pipe - Hydronic Heating Only
• 2 Pipe - Hydronic Cooling Only
NOTES:
1. Continuous water flow, chilled water or hot water.
2. Not recommended for high humidity applications.
3. Not recommended with unit-mounted thermostat on
vertical units (except package R).
4. The addition of any other component(s) will
require swage fitting for field braze or optional union
connection.
WITH HAND VALVES ONLY
BALL VALVE

LEGEND

(2) BALL

R

Balancing Valve

COIL

Ball Valve

M

BALL VALVE

S

Ball Valve with Memory Stop
Circuit Setter
Gate Shut Off Valve

BALL VALVE
(1) BALL
(1) GATE

Motorized 2-Way Valve

R
GATE SHUT
OFF VALVE

COIL

*When aquastat is used for automatic changeover, bypass is
required as indicated by dashed line.
NOTES:
1. Packages factory furnished and installed.
2. Valves are 5/8-in. ODS unless otherwise specified.
3. If an automatic flow control valve is added, it will be
located on supply line between shutoff valve and coil (or
motorized control valve, if supplied).

S

BALL VALVE
(2) BALL
(1) BALANCING

R
BALANCING
VALVE

COIL

BALL VALVE

S

CIRCUIT SETTER
(1) BALL
(1) CIRCUIT SETTER

R

COIL

BALL VALVE

S

BALL VALVE
(2) BALL
(1) 2-WAY MOTORIZED R

COIL

MOTORIZED
2-WAY VALVE
M

BALL VALVE

S
BALL VALVE (WITH
MEMORY STOP)
(2) BALL (ONE WITH
MEMORY STOP)
R
(1) 2-WAY MOTORIZED

COIL

M
MOTORIZED
2-WAY VALVE
M

S

Fig. 47 — Valve Package without Motorized Control

48

BALL VALVE

NOTE: The project specifications for system pressure, pressure drop limitations, and flow rate should be checked prior to
selection of specific components or the valve package size.
42C,D,V STEAM CONNECTIONS — On units with steam
heating coils, the maximum steam pressure applied to the unit
should never exceed 10 psig. However, when steam is used on
a 4-pipe application system with 1-row and 2-row coils the
maximum steam pressure should never exceed 5 psig (suitable
for only low pressure steam).
Do not drain the steam mains or take-off through the coils.
Drain the mains ahead of the coils through a steam trap to the
return line. Overhead returns require 1 psig of pressure at the
steam trap discharge for each 2 ft elevation to ensure continuous condensate removal.
Proper steam trap selection and installation is necessary. As a
guideline in creating a steam trap locate the steam trap discharge at least 12 in. below the condensate return connection.
This provides sufficient hydrostatic head pressure to overcome
trap losses and ensure complete condensate removal.
42C,D,V DIRECT EXPANSION (DX) REFRIGERANT
PIPING — Use the condensing unit manufacturer's recommended line sizes and requirements. Suction line must be
insulated for correct operation. Use refrigerant-grade copper
lines only. The unit is not applied as a heat pump.
Thermostatic expansion valve (TXV) and sensing bulb are
factory-installed on units when DX coil option is chosen with
distributor and TXV.
NOTE: If a hot water coil is used in the reheat position, a fieldsupplied freezestat must be installed to protect the coil.
TEST AND INSULATE — When all joints are complete,
perform hydrostatic test for leaks. Vent all coils at this time.
Check interior unit piping for signs of leakage from shipping
damage or mishandling. If leaks are found, notify a Carrier
representative before initiating any repairs. Release trapped air
from system (refer to Make Final Preparations section).
Never pressurize any equipment beyond specific test pressure. Always pressure test with an inert fluid or gas, such as
clear water or dry nitrogen to avoid possible damage or injury
in the event of a leak or component failure during testing.

42C,D,V DRAIN CONNECTIONS — Install drain line in
accordance with all applicable codes. A continuous pitch of
1 in. per 10 ft of condensate drain line run is necessary for
adequate condensate drainage. Insulate the drain line to
prevent sweating. Extend the drain line straight from the drain
pan before making any turns. The installer must provide proper
support for the drain line to prevent undue stress on the
auxiliary drain pan.
Install trapped drain line in accordance with all applicable
codes (see Fig. 48). A drain trap may be required by local
codes and is recommended for odor control. The differential
height inlet to outlet must be at least 1-in. wg greater than the
total static pressure of the unit. The differential height of the
outlet to the bottom of the trap must not be less than the total
static pressure of the unit.
Provide a trap of at least 2-in. near the end of the drain line
to prevent odors from entering the rooms.

2 IN. MIN
CONDENSATE
PAN STUB-OUT

TRAP
7/8 IN. FIELD-SUPPLIED
DRAIN EXTENSION

Fig. 48 — Typical Drain Line Details
(42D Unit Shown)
42C,D,V WATER SUPPLY/RETURN CONNECTIONS —
Install piping in accordance with all applicable codes. Position
valves over the drain pan. Be sure valves are in proper operating position and are easily accessible for adjustment. See
Fig. 44-47. Refer to Fig. 49 for copper water tube and joint
material pressure ratings.
If coil and valve package connections will be made with a
solder joint, care should be taken to ensure that the components
in the valve package are not subjected to high temperatures,
which may damage seals or other materials. Many 2-position
electric control valves are provided with a manual operating
lever. This lever should be in the OPEN position during all
soldering operations.
If coil connection is made with a union, the coil side of the
union must be prevented from turning (it must be backed up)
during tightening. See Fig. 44-47 for common valve packages.

CAUTION
All water coils must be protected from freezing after initial
filling with water. Even if system is drained, unit coils may
still have enough water to cause damage when exposed to
temperatures below freezing.
Following the hydrostatic test, insulate all piping to prevent
sweating.
To ensure compliance with building codes, restore the structure's original fire resistance rating by sealing all holes with
material carrying the same fire rating as the structure.

CAUTION
DO NOT OVERTIGHTEN! Overtightening will distort
(egg shape) the union seal surface and destroy the union.

49

Table 5 — Piping Components
SYMBOL/SKETCH

CV FACTOR
3/ in.
in.
4

RATING*
PSI
F

MANUAL AIR VENT: Threaded brass needle
valve with screwdriver slot for adjustment.
Application — Body brazed into high point of
heating and cooling coils for bleeding air from
coil. Standard item on all hydronic coils (not
used on steam or DX coils). Should not be
used in lieu of main system air vents.

N/A

N/A

400

100

NO

AUTOMATIC AIR VENT: Nickel plated brass
valve, fiber-disc type, with positive shut-off ballcheck and quick vent feature via knurled vent
screw.
Application — Optional replacement for manual air vent. Automatically passes minute
quantities of air through the fiber discs which
expand upon contact with water, completely
sealing the valve. As air accumulates, the fiber
discs dry and shrink, repeating the cycle. Not
recommended for removing large quantities of
air encountered during initial start-up or subsequent draining and refilling. Should not be
used in lieu of main system air vents.

N/A

N/A

125

240

NO

SWAGE: Copper tube end expanded to accept
a copper tube of the same size for factory or
field brazing.
Application — Used where possible for all tubing joints for best joint integrity.

N/A

N/A

300

200

YES

UNION: Combination wrought copper/cast
brass union assembly, solder by solder.
Application — Used for quick connect (and disconnect) of valve package components to minimize field labor and facilitate servicing of unit.

N/A

N/A

300

200

YES

INSERTION TEST PORT: Brass body valve
for acceptance of test probe (up to 1/8 in.
diameter).
Application — Installed on one (or both) sides
of the coil to allow for temperature or pressure
sensing. Used for close tolerance water balancing and service analysis.

N/A

N/A

250

250

NO

DESCRIPTION

1/
2

LEGEND
Cv — Coefficient of Velocity
DX — Direct Expansion

STEAM
USE

NOTES:
1. Motorized 2-way valves have a maximum close-off differential
of 25 psi.
2. Motorized 3-way valves have a maximum close-off differential
of 10 psi.

*Check all system component pressure ratings (coils, values,
pumps, etc.) with manufacturer and any applicable local or national
piping codes prior to specifying system pressure rating.

50

Table 5 — Piping Components (cont)
SYMBOL/SKETCH

FLOW

CV FACTOR

DESCRIPTION

1/

2

in.

3/
4

in.

RATING*
PSI

F

STEAM
USE

PRESSURE TEST PORT: Brass body 1/4 in.
service access fitting with removable depressor type core.
Application — Installed on both sides of the
coil to allow for pressure sensing. Attach
pressure gages to facilitate close tolerance
water balancing.

N/A

N/A

400

210

NO

GAGE COCK: Brass shut-off valve with
1/ in. FPT fitting for attachment of pressure
4
gages.
Application — Installed on both sides of the
coil to allow for pressure sensing. Attach
pressure gages to facilitate close tolerance
water balancing. May be used in bleed
bypass line to regulate water flow.

N/A

N/A

200

250

N/A

CIRCUIT SETTER: Variable water flow balancing valve with manual adjustment knob,
pointer, percent-open scale, memory stop
and integral pressure read-out ports.
Application — Used for close tolerance water
flow balancing. Positive shut-off ball valve
feature allows usage as combination balancing and shut-off valve.

2.12

3.9

300

250

NO

BALANCE VALVE: Variable water flow manual balancing valve with screwdriver slot
adjustment screw.
Application — Often used in conjunction with
test port fittings for water flow balancing. Balance by temperature differential or coil pressure drop (check specifications for service
fittings required if balancing by pressure
drop). May be used in 3-way valve bypass
line to permit equal flow balancing.

3.0

8.9

150

200

NO

150

160

NO

FIXED FLOW VALVE: Flexible orifice type
(non-adjustable).
Application — Used for water flow balancing.
Valve automatically adjusts the flow to within
10% of set point. Requires 15 psi
(35 ft) of additional pump head for proper
operation.

LEGEND
Cv — Coefficient of Velocity
DX — Direct Expansion

Valve orifice size
determines CV factor. The orifice of
these fixed flow
valves changes as
flow is regulated.
As the water pressure increases,
the orifice size
decreases,
thereby automatically limiting the
flow rate to the
specified gpm
(±10%).

NOTES:
1. Motorized 2-way valves have a maximum close-off differential
of 25 psi.
2. Motorized 3-way valves have a maximum close-off differential
of 10 psi.

*Check all system component pressure ratings (coils, values,
pumps, etc.) with manufacturer and any applicable local or national
piping codes prior to specifying system pressure rating.

51

Table 5 — Piping Components (cont)
SYMBOL/SKETCH

CV FACTOR

DESCRIPTION

1/

2

in.

3/
4

RATING*

in.

PSI

F

STEAM
USE

STRAINER: Y-type body with 50 mesh stainless steel screen.
Application — Used for removal of small particles from system water during normal system
operation. Should not be used in lieu of main
system strainers. Strainer screen may have to
be removed during initial high pressure system flushing during start-up. Screen should be
removed and cleaned per normal maintenance schedule (provisions for strainer blowdown not provided).

9.0
Clean

19.0
Clean

400

250

N/A

GATE VALVE: Manual shut-off valve.
Application — Used for unit isolation during
system flushing, servicing, etc. Do not use for
water balancing.

19.8

36.0

200

200

NO

1.8

3.9

200

200

NO

COMPRESSION STOP VALVE:
Manual shut-off valve.
Application — Used for unit isolation during
system flushing, servicing, etc. Not recommended for high flow rates due to relatively
high pressure drop.

2.3

5.4

150

200

NO

BALL VALVE: Manual balance and shut-off
valve.
Application — Used for unit isolation and
water flow balancing. Without memory stop
feature water balance point must be marked
by installer (if necessary). Check specifications for service fittings required when used
for water balancing.

4.0

7.5

400

200

YES

BALL VALVE WITH MEMORY STOP:
Manual balance and shut-off valve.
Application — Used for unit isolation and
water flow balancing. The adjustable memory
stop feature allows return to the balance point
after shut-off. Check specifications for
service fittings required when used for water
balancing.

4.0

7.5

400

200

N/A

GLOBE VALVE: Standard pattern, manual
shut-off and throttling valve.
Application — Used for unit isolation. Not recommended for high flow rates due to relatively
high pressure drop.

NOTES:
1. Motorized 2-way valves have a maximum close-off differential
of 25 psi.
2. Motorized 3-way valves have a maximum close-off differential
of 10 psi.

LEGEND
Cv — Coefficient of Velocity
DX — Direct Expansion
*Check all system component pressure ratings (coils, values,
pumps, etc.) with manufacturer and any applicable local or national
piping codes prior to specifying system pressure rating.

52

Table 5 — Piping Components (cont)
SYMBOL/SKETCH

CV FACTOR

DESCRIPTION

1/

2-WAY MOTORIZED VALVE: Electric 2-position flow
control valve (open/closed). Normally closed body
with manual override lever. Installed in supply line to
unit.
Application — All standard control and valve packages are based upon normally closed valves (valve
electrically powered open and closed by spring
return when electric power removed). Manual
override lever allows valve to be placed in the open
position for secondary (unit) flushing, constant water
flow prior to start-up, etc. Manual override is automatically disengaged when valve is electrically activated. Consult factory for normally open valve
applications.
3-WAY MOTORIZED VALVE: Electric 2-position flow
control valve (closed to coil/open to bypass or open
to coil/closed to bypass). Normally closed with manual override lever. Installed in supply line to unit.
Application — Same comments as 2-way motorized
valve except with manual override lever engaged the
valve is open to both ports and water flow will take
the path of least resistance through the valve package (not necessarily 100% through the coil).

2

in.

3/
4

in.

2.3

2.3

5.0

5.0

RATING*

STEAM
USE

PSI

F

300

200

YES
15
PSI
MAX.

300

200

N/A

SERVICE
2.8

2.8

BYPASS

MODULATING VALVE (Optional)
(Non-Spring Return, Floating Point Actuator):
Modulating valves are designed to control the flow in
the circuit by making incremental adjustments to the
flow path within the valve.
Application — To control fluid flow in fan coil units.
On the 42DD,SG,SJ,SH commercial fan coil units,
the factory-provided modulating valve has application restrictions. In these models, the valve packages
are located in the air stream, downstream of the coil.
Due to the ambient temperature limitations of the
modulating valves, the valves can be used in the
units listed above only with a 2-pipe cooling system.

4.0

300

200

N/A

MODULATING VALVE (Requires ETO [Engineering to Order])
(Spring Return): Modulating valves are designed to
control the flow in the circuit by making incremental
adjustments to the flow path within the valve.
Application — Same comments as non-spring return
except when powered, the actuator moves to the
desired position, at the same time tensing the spring
return system. When power is removed for more
than two minutes the spring returns the actuator to
the normal position.

4.0

300

200

N/A

AQUASTAT: Water temperature sensing electrical
switch.
Application — Clips directly on nominal size 1/2 in. or
3/ in. copper tubing for water temperature sensing.
4
Must be correctly located for proper control
operation.
LEGEND
Cv — Coefficient of Velocity
DX — Direct Expansion

NOTES:
1. Motorized 2-way valves have a maximum close-off differential
of 25 psi.
2. Motorized 3-way valves have a maximum close-off differential
of 10 psi.

*Check all system component pressure ratings (coils, values,
pumps, etc.) with manufacturer and any applicable local or national
piping codes prior to specifying system pressure rating.

53

IMPORTANT: THE ABOVE CHART IS FOR
REFERENCE ONLY. Check all system component
pressure ratings (coils, valves, pumps, etc.) and any
applicable local or national piping codes prior to
specifying system pressure rating.

JOINT MATERIALS
A

50-50 Lead-Tin at 200 F

B

50-50 Lead-Tin at 150 F

C

50-50 Lead-Tin at 100 F

Note 1

D

95-5 Tin-Antimony at 200 F

E

95-5 Tin-Antimony at 150 F

F

95-5 Tin-Antimony at 100 F

NOTES:
1. Not recommended for high system water pressures.
2. Standard factory joint material.

Fig. 49 — Copper Water Tube and Joint Material Pressure Ratings

54

Note 2

Step 3 — Make Electrical Connections — Refer
to unit nameplate for required supply voltage, fan and heater
amperage and required circuit ampacity. Refer to unit wire diagram for unit and field wiring. Make sure all electrical connections are in accordance with unit wiring diagram and all applicable codes.
The fan motor(s) should never be controlled by any wiring
or device other than the factory-supplied switch or thermostat/
switch combination unless prior factory authorization is
obtained. Fan motor(s) may be temporarily wired for use
during construction only with prior factory approval and only
in strict accordance with the instructions issued at that time.
Floor cabinet type units have factory-wired integral fan
switches. Connect power wires to leads in unit junction box per
unit wiring diagram. On the other units, install remote fan
switch according to job drawings. Hook up switch and power
wiring per unit wiring diagram.
Install optional, wall-mounted thermostat per instructions
shipped with thermostat. Connect as shown on unit wiring
diagram.
Units with factory-supplied and factory-installed aquastats
may be shipped with the aquastats mounted on a coil stub-out.
If this is the case, remove the aquastat before installing valve
package. When reinstalling aquastats, consult the factorypiping diagram in the submittal for proper location. If the valve
package is field-supplied, the aquastat must be installed in a
location where it will sense the water temperature regardless of
the control valve position. A bleed bypass may be required to
guarantee proper aquastat operation. The aquastat bypass line
allows a small amount of water to flow from the supply to the
return piping when the control valve is closed.
NOTE: The aquastat must be able to sense whether the
flowing water is being chilled or heated and switches a contact
closed to provide automatic summer or winter changeover for
the system. When a two-pipe cooling/heating system with
optional auxiliary electric heat is desired, an additional
aquastat is required.
All field wiring must be in accordance with governing
codes and ordinances. Any modification of unit wiring without
factory authorization will invalidate all factory warranties and
nullify any agency listings.
NOTES:
1. Motors are thermally protected.
2. Use copper conductors only.
3. See unit nameplate for power supply. Provided disconnect
means and overload protection as required.
4. Unit-mounted thermostats are not recommended for fan control
because of poor temperature sensing. Fan control not available
on 42VC,VE lowboy units.

IMPORTANT: Wiring diagrams shown depict typical
control functions. Refer to unit wiring label for specific
functions.
Units may be equipped with line voltage controls or
24 VAC control systems. The following descriptions are for
line voltage controls only. For 24 v control operating sequence,
refer to thermostat operating instructions.
STANDARD WIRING PACKAGES
Manual Fan Control — On all vertical cabinet units, the standard fan-speed switch is furnished unit-mounted and wired.
See Fig. 50. On all vertical furred-in units and all horizontal
units, the switch is shipped separately on a decorative wall
plate for field mounting and wiring.
The standard switch has LOW, MEDIUM, HIGH and OFF
positions plus an auxiliary contact to energize thermostats,
valves, dampers, etc.
NOTE: Wiring diagrams are for 120-v power supply. If other
voltages for heaters or controls are specified, wiring may differ
from that shown.

Fig. 50 — Manual Fan Control

55

Thermostatic Fan Control, 2-Pipe System with Safety
Cycle — This control is used for high humidity situations in
which condensate problems can occur if fan is turned off while
chilled water is still running through the coil.
The wiring provides fan cycling from HIGH to LOW on the
cooling cycle and from LOW to OFF on the heating cycle. An
ON-OFF toggle switch replaces the standard 3-speed fan
switch. The toggle switch can be concealed to ensure that the
unit runs on low speed when cooling. This action greatly
reduces the chance of condensation problems that exist with
other standard fan cycling controls. See Fig. 52.

Thermostatic Fan Control, 2-Pipe Systems — The thermostat cycles the fan on and off from any selected speed setting to
maintain selected room temperature. Controls can be wired for
heating-only, cooling-only or for heating/cooling by the addition of an automatic changeover device that senses water temperature and changes the action of the thermostat as required.
See Fig. 51.

NOTES:
1. Motors are thermally protected.
2. Use copper conductors only.
3. See unit nameplate for power supply. Provide disconnect
means and overload protection as required.

Fig. 52 — Thermostatic Fan Control
(2-Pipe System with Safety Cycle)
Thermostatic Electric Valve Control, 2-Pipe — A thermostatically controlled 2-position valve provides superior control
to fan cycling. With this control, the fan runs continuously unless it is manually switched to the OFF position. The fan must
be on before the valve can be opened to supply water to the
coil.
This system can be used for normal 2-pipe changeover
systems and can also be furnished for cooling-only or heatingonly applications by omitting the changeover and specifying
which application is intended. See Fig. 53 and 54 for line voltage control. See Fig. 55 and 56 for 24-v control.

NOTES:
1. Motors are thermally protected.
2. Use copper conductors only.
3. See unit nameplate for power supply. Provide disconnect
means and overload protection as required.
4. Unit-mounted thermostats are not recommended for fan control
because of poor temperature sensing. Fan control not available
on 42VC,VE lowboy units.

Fig. 51 — Thermostatic Fan Control
(2-Pipe System)

56

120-V WHT ALL OTHERS BLK
NEC CLASS 1 WIRING

a42-4060

Fig. 53 — 42SG,SH,SJ,VA,VB,VC,VE,VF 2-Pipe Heating and Cooling with
Automatic Changeover — Unit-Mounted Thermostat (Line Voltage)

THERMOSTAT PART # 702893-36
PUR

ORG

REMOTE DEVICE BOX

COOL BLU

HEAT RED

L1 BLK

L2 OR N YEL

HI W/ORG

MED W/RED

LOW W/BRN

UNIT MOUNTED
J BOX

NEC CLASS 1 WIRING

MOTOR

M BLU
H BLK
WHT
COM

3
2
1

RED

2

BLU

1

BLK

3

BLK
RED

RISE

BLU
AQUASTAT

*WHT

BLK

BLOWER

4

PUR

BRN

L RED

VALVE

L2 or N

*WHT

2
1

L1

BLK
WHT

EQUIPMENT
GROUND
ONLY 120V WHT/ALL OTHERS BLK

Fig. 54 — 42C,S,V and 42D (600-1000) 2-Pipe Heating and Cooling with Automatic Changeover —
Remote/Wall-Mounted Thermostat (Line Voltage)
57

a42-4059

Fig. 55 — 42SG,SH,SJ,VA,VB,VF 2-Pipe Heating and Cooling with Automatic Changeover —
Unit-Mounted Debonair® Thermostat (24-v), Duct Sensor

a42-4061

NEC CLASS 2 WIRING

Fig. 56 — 42C,S,V (except VG), and 42D (600-1000 cfm) 2-Pipe Heating and Cooling with
Automatic Changeover — Remote/Wall-Mounted Debonair® Thermostat (24-v)
58

Two control methods are available:
1. Use the standard automatic changeover thermostat with a
dead band between heating and cooling.
2. Use a manual changeover thermostat. With this method
only one changeover is required.
Be sure to include a 2-way or 3-way electric valve with this
system.
NOTE: Wiring diagrams are for 120-v power supply. If other
voltages for heaters or controls are specified, wiring may differ
from that shown. See Fig. 57 and 58 for line voltage control.
See Fig. 59 and 60 for 24-v control.

Thermostatic 2-Pipe Auxiliary Electric Heat with Valve
Control — This system, also called twilight or intermediate
season electric heat, goes a long way towards solving the
spring and fall control problems of 2-pipe systems.
Chilled water can be run late into the fall, turned on early in
the spring and heat will still be available to all units whenever
required.
In winter the system is switched over to hot water. Two
changeover devices are required for this. One device switches
the action of the thermostat and the other locks out the electric
heat when hot water is in the coil.
With this system, the fan runs continuously unless manually
switched to OFF position. Fan must be on before thermostat
can send signal to open chilled water valve or turn on electric
heater.

a42-4066

120-V WHT ALL OTHERS BLK
NEC CLASS 1 WIRING

Fig. 57 — 42SG,SH,SJ,VA,VB,VC,VE,VF 2-Pipe Heating and Cooling with Auxiliary Heat —
Unit-Mounted Thermostat (Line Voltage)

59

THERMOSTAT PART # 702893-36
PUR

ORG

REMOTE DEVICE BOX

COOL BLU

HEAT RED

L1 BLK

L2 OR N YEL

HI W/ORG

W/RED

LOW W/BRN

UNIT MOUNTED
J BOX
AQUASTATS

QUICK CONNECT
OPTIONAL

BLOWER

BRN

L RED

RED

M BLU

BLU

BLK
RED

H BLK

MOTOR

RISE

BLU

PUR
BLK

BLK

*WHT

WHT
COM

*WHT

EQUIPMENT
GROUND

RED

RED

BRN

BLU

RED

BLK

*WHT

WHT

RISE

L2 or N
VALVE

L1
*WHT

CONTACTOR

LIMIT SWITCH
1

BLK

BLK

BLK
*WHT

L1

L2 OR N

GRN

ONLY 120V WHT/ALL OTHERS BLK

Fig. 58 — 42C,S,V (except VG), and 42D (600-1000 cfm) 2-Pipe Heating and Cooling with
Auxiliary Heat — Remote/Wall-Mounted Thermostat (Line Voltage) and Dual Power Source
THERMOSTAT #33CSSN2-FC
R

G

Y1

G3

BLK

DUCT SENSOR 33CSSEN-DS

RS

PUR

RS+5

W1 G2

C H2O CK1

CHANGE OVER
SENSOR

RED

YEL

BLU

BRN

BLK

RED

ORG

WHT

BLK
BLK

VALVE
BLK
BLK

2
Q/C
1

YEL

33
YEL

RED G

QUICK CONNECT
FAN

BLU G2/(W)
BLK G3/(Y)

BLK

COM

(VALVE)

RED

4

(COOL)

3

HI

ORG

(HEAT)

YEL
24

RED L
BLU M

BLU
BLK
*WHT

MED

2
1

BLOWER
BLK H

MOTOR

WHT COM

TRANSFORMER

BLK

EQUIPMENT
GROUND
L1
L2 or N

LOW

WHT/RED

BLK

BLK
*WHT

*WHT

BRN

YEL

0

YEL

BLK

L1

1

06
3
4
2

NC

7

COM8
NO

LIMIT SWITCH

6

BLK
N

WHT

BLK

CONTACTOR

EQUIPMENT
GROUND

ELEC. HEATER

Fig. 59 — 42SG,SH,SJ,VA,VB,VC,VE,VF 2-Pipe Heating and Cooling with Auxiliary Heat —
Unit-Mounted Debonair® Thermostat (24-v), Duct Sensor and Dual Power Source
60

a42-4067

NEC CLASS 2 WIRING

Fig. 60 — 42C,S,V (except VG), and 42D (600-1000 cfm) 2-Pipe Heating and Cooling with
Auxiliary Heat — Remote/Wall-Mounted Debonair® Thermostat (24-v)
Normally, an automatic changeover thermostat with a dead
band between heating and cooling is used, but a manual
changeover thermostat is also suitable. A 2-way or 3-way valve
must also be used so that the chilled water is off whenever the
heater is on. No changeover device to sense water temperature
is necessary.
NOTE: Wiring diagrams are for 120-v power supply. If other
voltages for heaters or controls are specified, wiring may differ
from that shown. See Fig. 61 and 62 for line voltage control.
See Fig. 63 and 64 for 24-v control.

Thermostat 2-Pipe Total Electric Heat with Valve Control — With this system, the complete heating requirement for
the space is provided by the electric heater; the water system is
never changed over for heating. It is therefore possible, just as
with 4-pipe systems, to have heating or cooling at any time of
the year.
The fan runs continuously unless it is manually switched to
OFF position. Fan must be on before thermostat can send
signal to open chilled water valve or turn on electric heater.

61

a42-4073

120-V WHT ALL
OTHERS BLK
NEC CLASS 1 WIRING

Fig. 61 — 42SG,SH,SJ,VA,VB,VC,VE,VF 2-Pipe Cooling with Total Electric Heat —
Unit-Mounted Thermostat (Line Voltage)

Fig. 62 — 42C,S,V (except VG), and 42D (600-1000 cfm) 2-Pipe Cooling with Total Electric Heat —
Remote/Wall-Mounted Thermostat (Line Voltage)
62

NOTE: Units may have 2 or 4
elements. Elements wired in
parallel.

a42-4072

Fig. 63 — 42SG,SH,SJ,VA,VB,VC,VE,VF 2-Pipe Cooling with Total Electric Heat —
Unit-Mounted Debonair® Thermostat (24-v) and Duct Sensor

THERMOSTAT #33CSSN2-FC

REMOTE DEVICE BOX
RS+5

RS

R

G

Y1

G3

W1 G2

C H2O CK1

NEC CLASS 2 WIRING

YEL

BLU

BRN

BLK

PUR

RED

ORG

VALVE
BLK

COOL

2
Q/C
1

BLK

YEL

33ZCRLYBRD
G
G2/(W)
G3/(Y)
COM

YEL

QUICK CONNECT
FAN
BLK

(VALVE)

RED

4

BLU

(COOL)

RED L
BLU M

3

HI

BLK

BLOWER
BLK H

2
ORG

(HEAT)

YEL
24

*WHT

MED

1

MOTOR

WHT COM

TRANSFORMER

EQUIPMENT
GROUND
L1
L2 or N

BLK

LOW

WHT/RED

BLK
*WHT

*WHT

0

YEL

1

06

EQUIPMENT
GROUND

3

BLK

4

L1

2

NC

7

BRN

LIMIT SWITCH

COM 8
NO

6

BLK

BLK

WHT

N

ELEC. HEATER

Fig. 64 — 42C,S,V (except VG), and 42D (600-1000 cfm) 2-Pipe Cooling with Total Electric Heat —
Remote/Wall-Mounted Debonair® Thermostat (24-v) and Dual Power Source
63

With this system, the fan runs continuously unless it is
manually switched to OFF position. Fan must be on before
thermostat can send signal to open the chilled water or hot
water valve.
NOTE: Wiring diagrams are for 120-v power supply. If other
voltages for heaters or controls are specified, wiring may differ
from that shown. See Fig. 65 and 66 for line voltage control.
See Fig. 67 and 68 for 24-v control.

Thermostatic Valve Control, 4-Pipe — The 4-pipe system
provides the ultimate in economy and room temperature control. Both hot water and chilled water are available at any time.
Normally an automatic changeover thermostat is used, but a
manual changeover thermostat is also suitable. Two 2-way
valves, two 3-way valves, or one 2-way plus one 3-way valve
must be selected. An automatic changeover device to sense
water temperature is not required.
a42-4079

120-V WHT ALL OTHERS BLK
NEC CLASS 1 WIRING

Fig. 65 — 42SG,SH,SJ,VA,VB,VC,VE,VF 4-Pipe Heating and Cooling —
Unit-Mounted Thermostat (Line Voltage)

64

ONLY 120V WHT/ALL
OTHERS BLK

Fig. 66 — 42C,S,V (except VG), and 42D (600-1000 cfm) 4-Pipe Heating and Cooling —
Remote/Wall-Mounted Thermostat (Line Voltage)
a42-4078

Fig. 67 — 42SG,SH,SJ,VA,VB,VC,VE,VF 4-Pipe Heating and Cooling —
Unit-Mounted Debonair® Thermostat (24-v) and Duct Sensor
65

THERMOSTAT #33CSSN2-FC

REMOTE DEVICE BOX
RS+5

RS

R

G

Y1

G3

W1 G2

C H2O CK1

NEC CLASS 2 WIRING

YEL

BLU

BRN

BLK

PUR

RED

ORG

VALVE
BLK

COOL

BLK

2
Q/C
1

PUR
YEL

33ZCRLYBRD
VALVE
BLK

HEAT

BLK

2
Q/C
1

BRN
YEL

G
G2/(W)
G3/(Y)
COM

QUICK CONNECT
FAN

BLK

(VALVE)

YEL

RED
BLU

(COOL)
HI
YEL

(HEAT)

YEL
24

MED

BLK

4

RED L
BLU M

3

BLOWER
BLK H

2
1

MOTOR

WHT COM

TRANSFORMER

LOW
EQUIPMENT
GROUND
L1
L2 or N

BLK
*WHT

BLK
*WHT

Fig. 68 — 42C,S,V (except VG), and 42D (600-1000 cfm) 4-Pipe Heating and Cooling —
Remote/Wall-Mounted Debonair® Thermostat (24-v)
Do not secure wallboard to drain pan edges or to control
box enclosure. Condensate leaks or electrical shorts may result.
An alternate method of enclosing the unit is to frame one or
more sides with studding and apply the wall board to this framing. This method requires specific unit features and return access panels when used on the return-air side of a unit. Units not
properly equipped will exhibit poor cooling and/or heating performance and could experience excessive or premature component failures.
Prevent sheetrock dust or other debris from settling on coil
fins, motor-blower assembly or other unit interior surfaces.
Return access and exposed cabinet units may be furnished
with a baked enamel finish. Small scratches in this finish may
be repaired with touch-up paint available from the factory.
Some colors of touch-up paint are available in aerosol containers and all touch-up paint is available in pint, quart, and gallon
cans.
To repaint the factory-baked enamel, the finish should be
prepared by light sanding with no. 280 grit sand paper or
no. 000 or no. 0000 fine steel wool. The surface may also be
wiped with a liquid surface etch cleaning product such as “No
Sand” or “Pasceo.” These items should be available at most
paint product stores. It should be noted that the more conscientiously this preparation is done, the more effective it will be.
After this preparation is accomplished, the factory finish
should provide excellent adhesion for a variety of air-dried top
coats. Enamel will give a more durable, higher gloss finish,
while latex will not adhere as well and will give a dull, softer
finish. Top coats involving an exothermic chemical process between two components, such as epoxies and urethanes, should
be avoided.
Factory aerosol touch-up paint may require a number of
light “dust coats” to isolate the factory-baked enamel finish
from the quick drying touch-up paint.

Step 4 — Make Duct Connections — Install all
ductwork to and from unit in accordance with all applicable
codes. Duct construction must allow unit to operate within duct
external static pressure limits as shown on job submittals. Units
designed to operate with ductwork may be damaged if operated
without intended ductwork attached.
Units provided with outside air should have some method
of low-temperature protection to prevent freeze-up.
Insulate ductwork as required. Use flexible connections to
minimize duct-to-unit alignment problems and noise transmission where specified.
Set unit markings for minimum clearance to combustible
materials and first 3 ft of ductwork. Install ductwork, accessory
grilles and plenums so that they do not restrict access to filter.
Cut openings for supply-air and return-air grilles, thermostats
and switch plates where specified on job drawings. Be careful
not to cut wires, piping or structural supports. Use a steel thermostat shield ring to protect drywall from thermostat wiring
where applicable.
CAUTION
Prevent dust and debris from settling in unit. If wall finish
or color is to be spray applied, cover all openings to prevent spray from entering unit. Failure to do so could result
in the reduction of unit efficiency.

Step 5 — Frame and Finish Unit — Models 42SG,
SH and SJ have factory enclosures and may be finished with
normally accepted wall covering. However, drywall secured
with adhesive bonding alone is not recommended.
Use low-profile sheet metal panhead screws to secure
wallboard to unit frame.
Do not apply sheet metal screw or nails where they can penetrate coil, riser pipes, or electrical junction box and raceways.

66

there is no flow through valve. Ball valves may be
used as shutoff valves.

Step 6 — Cut out Openings for Grilles and
Thermostats — On all units with optional supply-air or

return-air grilles, dampers, thermostats, and switch plates, cut
out openings where specified on the job plans. Be careful not to
cut wires, piping or structural supports.
For remote-mounted thermostats use a steel thermostat
shield ring to protect drywall from thermostat wiring where
applicable.
Prevent dirt, dust, and debris from settling in unit. If wall
finish or color is to be spray applied, cover all openings to
prevent overspray entering unit.

START-UP
Start-up procedures vary depending on time of year (summer or winter) and building characteristics (new building/old
building, occupied/unoccupied, etc.)
Start-up in the cooling mode requires that proper care be
given to avoid condensation problems. Condensation forms on
surfaces that are colder than the dew point of the surrounding
air. If a unit is started and is piped with low-temperature chilled
water in a hot, humid atmosphere, condensation will form on
many parts of the unit. In order to avoid excessive condensation, higher temperature water should initially be used (approximately 65 to 70 F) and set the fan coil control at low or medium fan speed. Be sure the fan current does not exceed motor
nameplate values. Also, the building should be as completely
closed as possible and outside air supply fans, and bathroom
and kitchen exhaust fans should be off.
As the building temperature drops, the chilled water temperature can be gradually reduced until it reaches 50 F. At this
point the outside air fans can be turned on. When the chilled
water temperature is reduced to its design point, the exhaust
fans can be turned on.

Step 7 — Make Final Preparations
1. Turn off power to the unit (open unit electrical disconnect).
2. Install thermostats and perform any other final wiring as
applicable.
3. Clean dirt, dust, and other construction debris from unit
interior. Be sure to check fan wheel and housing.
4. Rotate fan wheel by hand to be sure it is free and does not
rub housing. Check that wing nuts securing fan assembly
to fan deck are tight.
5. Ensure all panels and filters are installed before checking
fan operation. Turn on power to the unit.
6. Install filter in frame at front of coil. If field-supplied
filters are used, be sure size is as specified in Tables 1-4.

SERVICE

IMPORTANT: Do not start up or operate unit without
filter. Be sure filter and unit interior are clean.

Excessive Condensation on Unit — Running chilled

water through a fan coil unit with the unit fan off can cause
excessive condensation. If fan cycling is used, a water flow
control valve should be installed to shutoff the water when the
fan stops.
Other methods of control, which avoids condensation problems, are as follows:
1. Continuous fan operation with motorized chilled water
valve controlled by a thermostat.
2. Continuous fan operation with thermostat control to
switch fan from high to low speed (instead of off).

7. Check the fan and motor operation. The fan switch is
located in a switch box behind spring-loaded access door
on unit cabinet or is wall-mounted. Speeds are marked on
switch plate as follows:
OFF
H - High Speed
M - Medium Speed
L - Low Speed
Rotate knob clockwise to desired speed. To turn off,
rotate knob counterclockwise to OFF.
8. Be sure drain line is properly and securely positioned and
that the line is clear. Pour water into drain to check
operation.
9. Vent all air from unit coil and related piping. If air vent is
manual, release air from system by turning air vent
screw 11/2 turns counterclockwise with screwdriver.
When steady steam of water begins to escape, close
valve. If air vent is automatic, trapped air will be vented
automatically. Vent release air slowly, usually dripping
water into drain pan in the process.
Make sure all service valves are open and that the motorized control valves, if supplied, are set for automatic
operation.
10. Check all control valves in the system for proper operation in accordance with valve manufacturer's instructions.
11. For units with factory-installed balancing valves, adjust
as follows:
a. Butterfly Valves — Turn valve gate by inserting
screwdriver into slot in valve top and rotating up
to 90 degrees. Valve is fully open when slot is parallel with valve body. When slot is perpendicular
to body, flow through valve is at minimum. Valve
does not seal against flow.
a. Ball Valves with Lever Handles — Valve gate
action is similar to butterfly valves above except
that when handle is perpendicular to valve body,

To Clean Coil
1. Be sure electrical service switch is open, locked, and
tagged while working on unit.
2. Remove return-air grille access panel and brush between
coil fins with stiff wire brush. Follow-up by cleaning with
vacuum cleaner. If coil is cleaned with air hose and
nozzle, take care not to drive dirt and dust into other
components.
3. Install clean filter. Refer to Clean or Replace Air Filters
section.

Coil Air Vent (Manual or Automatic) — Turn vent

cap clockwise (closed) while filling system; turn counterclockwise (open) to vent air. Tighten clockwise after venting. Turn
automatic vent cap slightly counterclockwise until water leaks
at about 10 drops per minute. Leak will stop within one-half
minute.

Check Drain — Lock open and tag unit electrical service
switch.
Check drain pan, drain line and trap at start of each cooling
season. A standard type pipe cleaner for 3/4-in. ID pipe can be
used to ensure that pipe is clear of obstruction so that condensate is carried away. Check the drain line at filter cleaning time
during the cooling season. Be sure that debris has not fallen
into unit through supply-air grille.
Fan Motor Bearings — Lock open and tag unit electrical service switch.

67

After proper airflow and supply power are assured, regular
filter maintenance is important to provide clean air over the
heater. Dirt that is allowed to deposit on the heating element
will cause hot spots and eventual element burn through. These
hot spots will normally not be enough to trip the high-limit
thermal cutout device and may not be evident until actual heater element failure.

Standard motors are permanently sealed and lubricated. No
lubrication is required unless special motors have been
supplied or unusual operating conditions exist.

Clean Fan Wheel — Lock open and tag unit electrical
service switch.
For access to fan assembly, remove front or bottom panel.
Fan assembly may be removed from its tracks if unit has a long
conduit lead. Use a stiff brush or vacuum to remove dirt and
debris from scroll. Wipe all fan surfaces with a damp cloth.

Clean or Replace Air Filters — Lock open and tag

unit electrical service switch.
At the start of each cooling season and after each month of
operation (more or less depending on operating conditions) replace throwaway filter or clean permanent filter.
THROWAWAY FILTER — Replace filter with a good quality filter of the size shown in Tables 1-4. Do not attempt to
clean and reuse disposable filters.
PERMANENT FILTER (FIBERGLASS TYPE)
1. Tap on solid surface to dislodge heavy particles.
2. Wash in hot water. If needed, use mild solution of commercial solvent such as sal soda or trisodium phosphate.
3. Set filter on end so that water drains out through slots in
frame. Allow filter to dry thoroughly.
4. Recharge filter with Film-Cor or similar recharging oil.
Three ounces is sufficient for medium size filter. Oil may
be applied by insect spray gun. For easier spraying, the oil
can be warmed.
If the filter is dipped in the recharging oil, remove it immediately and allow draining through slots in frame.
5. Replace filter in unit.
If another type of filter is used, follow the filter manufacturer's
instructions.

Clean Electric Heater — Lock open and tag unit elec-

trical service switch.
1. Remove dust, dirt, or foreign material before start-up. Do
not block normal airflow to and from units; blockage may
damage electric heaters.
2. Clean heater elements with soft brush or vacuum cleaner
as necessary.
3. To replace blown fusible links (nichrome heaters only):
a. Remove fan deck (horizontal units only) for
access to heater.
b. Remove nut securing link at each end; install new
link; reinstall nuts.
c. Reinstall fan deck (if removed).
Electric resistance heaters typically require no normal periodic maintenance when unit air filters are changed properly.
The operation and service life may be affected by other conditions and equipment in the system. The two most important operating conditions for an electric heater are proper airflow and
proper supply voltage. High supply voltage and/or poorly distributed or insufficient airflow over the element will result in
element overheating. This condition may result in the heater
cycling on the high-limit thermal cutout. The high-limit thermal cutout device is a safety device only and is not intended for
continuous operation. With proper unit application and operation, the high-limit thermal cutout will not operate. This device
only operates when a problem exists, and ANY condition that
causes high-limit cutout MUST be corrected immediately.
High supply voltage also causes excessive amperage draw and
may trip the circuit breaker or blow the fuses on the incoming
power supply.

Warranty — All equipment and components sold through

the Parts Department are warranted under the same conditions
as the standard manufacturer's warranty with the exception that
the warranty period is thirty (30) days unless the component is
furnished as a warranty replacement. Parts furnished as warranty replacements are warranted for the remaining term of the
original unit warranty or not less than thirty (30) days.

68

69

Copyright 2009 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53420004-01
Printed in U.S.A.
Form 42-3SI
Pg 70
12-09
Replaces: 42-2SI

START-UP CHECKLIST FOR 42C,D,S,V SERIES FAN COIL AIR CONDITIONERS
I. Project Information
Job Name _______________________________________________________________________
Address ________________________________________________________________________
City ______________________________________________State __________ Zip __________
Installing Contractor _______________________________________________________________
Sales Office _____________________________________________________________________
Start-up Performed By _____________________________________________________________

INSPECTION, INSTALLATION, AND START-UP CHECKLIST
ITEM
Receiving & Inspection
1. Unit received undamaged
2. Unit received complete as ordered
3. “Furnish only” parts accounted for
4. Unit arrangement/hand correct
5. Unit structural support complete and correct
Handling & Installation
6. Mounting grommets/isolators used
7. Unit mounted level and square
8. Proper access provided for unit and accessories
9. Proper electrical service provided
10. Proper overcurrent protection provided
11. Proper service switch/disconnect provided
12. Proper chilled water line size to unit
13. Proper hot water line size to unit
14. Proper refrigerant line sizes to unit
15. Proper steam line sizes to unit
16. Proper steam condensate trap on return line
17. Proper steam supply pressure to unit (10 psi max)
18. All service to unit in code compliance
19. All shipping screws and braces removed
20. Unit protected from direct & foreign matter
Cooling/Heating Connections
21. Protect valve package components from heat
22. Mount valve packages
23. Connect field piping to unit
24. Pressure test all piping for leaks
25. Install drain line and traps as required
26. Insulate all piping as required
27. Install drip lip under piping as required
Ductwork Connections
28. Install ductwork, fittings, and grilles as required
29. Flexible duct connections at unit
30. Proper supply and return grille type and size used
31. Control outside air for freeze protection
32. Insulate all ductwork as required

COMPLETE

ITEM
Electrical Connections
33. Refer to unit wiring diagram
34. Connection incoming power service(s)
35. Install and connection “furnish only” parts
36. All field wiring in code compliance
Unit Start-Up
37. General visual unit and system inspection
38. Check for proper fan rotation
39. Record electrical supply voltage
40. Record ambient temperatures
41. Check all wiring for secure connections
42. Close all unit isolation valves
43. Flush water systems
44. Fill systems with water/refrigerant
45. Vent water systems as required
46. All ductwork and grilles in place
47. All unit panels and filters in place
48. Start fans, pumps, chillers, etc.
49. Check for overload condition of all units
50. Check all ductwork and units for air leaks
51. Balance air systems as required
52. Record all final settings for future use
53. Check piping and ductwork for vibration
54. Check all dampers for proper operation
55. Verify proper cooling operation
56. Verify proper heating operation
57. Reinstall all covers and access panels

CL-1

COMPLETE

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53420004-01
Printed in U.S.A.
Form 42-3SI
CL-2
12-09
Replaces: 42-2SI

SERIAL NUMBER
RH

LH

QTY
CFM

ESP

WATTS

FAN AND MOTOR
FILTER
TYPE
EAT
db/wb
°F
EWT
PD
°F GPM H2O
SENSIBLE
BTUH

EAT
PD
db/wb EWT
°F GPM H2O
°F
STEAM
PSI

HEATING
BTUH

kW

VOLTAGE

__________________________________________________________________________________________________________________________________________________________________

__________________________________________________________________________________________________________________________________________________________________________

__________________________________________________________________________________________________________________________________________________________________________

__________________________________________________________________________________________________________________________________________________________________________

TOTAL
BTUH

COOLING

NOTE: Indicate repairs made, refrigerant added or removed (include amounts), field controls and valve packages added.

MODEL
NUMBER

42 Series Fan Coil Air Conditioner Maintenance Data Log

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - - - - - CUT ALONG DOTTED LINE
CUT ALONG DOTTED LINE

Copyright 2009 Carrier Corporation



---

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Format                          : application/pdf
Title                           : 42-3si.fm
Creator                         : msdt05k
Create Date                     : 2009:12:08 16:27:07-05:00
Creator Tool                    : PScript5.dll Version 5.2.2
Modify Date                     : 2009:12:08 16:27:07-05:00
Producer                        : Acrobat Distiller 9.0.0 (Windows)
Document ID                     : uuid:213ab6b7-e1eb-4635-9dcf-871d6179af40
Instance ID                     : uuid:ca88ac06-aefc-454f-8255-e29b03dbc123
Page Count                      : 72
Author                          : msdt05k

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