Carrier 48DH User Manual

Number One
AirConditioniiX)
Maker

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Division of Cairier Corporation
Syracuse New York

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Combination Heating/Cooling Units

INTRODUCTION

The 48DH, DL and DM combination heating/
cooling units are complete systems designed for
outdoor installation on slab or rooftop.

Installation consists of: rigging and mounting
the unit; attaching ductwork; making single gas,
electrical and condensate connections; and attach
ing thermostat leads. A field-furnished filter rack is
required in the return air stream.

RECEIVING THE UNIT

Examine the unit carefully for any damage
incurred in shipment. If found, file claim with

transportation company immediately.

Check unit nameplate to ensure that unit
electrical requirements match available power

supply, and that unit is designed for use with the

proper gas type (natural or liquefied petroleum).

Leave unit on shipping skids until ready for

mounting.

INSTALLATION

Check national and local gas and electrical

codes and local building codes for any special
installation requirements.

Unit Location — Install unit outdoors and as close

to building duct openings as possible. Unit may
face in any direction since neither the condenser

air inlet nor the flue outlet (Fig. 1) are affected by

wind. Do not locate unit near sources of con

taminated air.

Although the unit is weatherproof, position

unit so that water and ice from roofs or eaves

cannot fall directly on the unit.
SPACE LIMITATIONS - Provide sufficient space

for unimpeded air flow and for wiring and servicing
unit (Fig. 1).

, CONO UNIT

2-0 OVERHEAD SPACE SECTION
REQ FOR SERVICE AND ACCESS PANEL

AIR FLOW ;

002

'only .

SERVICE ^
OPENINGS ^0'

ACCESS SIDE

*This dimension is not applicable to 002 units because there are no

mounting rails

ta-'iiEiEJ ance space of 1 in. on duct connection side, and 12 in on

BOTH side:

FLUE OUTLET

—,—X::...

Space required for service Design certified by A G.A. for in­stallation on combustible type floor with a minimum ciear-

remaining sides

Indoor (Evaporator) Air

O'

____WIND CAP ASSEMBLY (CONDENSER AIR OUTLET

îLÎÎÎ 002 UNIT ONLY)

• DIAM*

(SmTG HOLES)

COMBUSTION AIR

.JSSiiSOc 045 8005

n DIAM HOLE

® FOR LINE

POWER WIRING

HEATING
SECTION

i ACCESS PANEL

) Condenser Air

Fig. 1 — Physical Data

Table 1 — Base Unit Dimensions (ft-in.)

UNIT

A 3-10
В
C
D
E
F
G
H 0-11У 0-11У
J

*Refer to Table 2 for differences of these series

48DL 48 DH 48DL 48DL 48 DM

002* 003

— —

0-10V3

0-11 Уз

1- 0

2- 2У

— —

0- 4 0- 4

3-10

0-1 оу 0-юу 0-1 оу

0-11 у

1- 0 1- 0 1- 0

2- 2%

4- 7 4- 7
4- 7% 4- 7%

1- 2

2- 2У

2- 2У
0-11У 0-11У
0- 4

1- 8
2- 2У

2- 2У
0- 4

48 DH 48DL

004

3_2

5-2У 5- 2% 5- 2%

1-ЗУ
1-8 1- 8
1-0

2-2У

2-4У 2- 2Ув 2- 4У

1-4У
0-7У

5- 2 5- 2
1- 5У
1- 0

2- 2У
1- 4У 1- 4У

0-11

Q45

1- ЗУ

1-11 1-11

1- 0

2- 2%

0- 7У

48DL

5- 2

5- 2У
1- ЗУ

1- 0

2- 2% 2- 2У

2- 4У
1- 4У
0- 7У

48DH

005

5- 7\

5- 8У

1 9

1-11

1- оу

2- 4У
1- 4У
1- 2У

Form 48DH-6

Table 2 — Physical Data

UNIT
OPERATING WT (lb)
REFRIG (22) CHG (Ib-oz)
COMPRESSOR

Cyl inders 2
Rpm (60-Hz)

CONDENSER FAN

Air Quantity (Cfm)

Motor Hp

EVAPORATOR FAN

CAPACITY (1000 Btuh)

Cool in g
Input Heotlng/Bonnet*

MAX EXTERNAL

STATIC PRESSURE
Heating (in. W.C.)

FILTERSt (1-in. thick)

Disposable — No. .. 1 15x20 1 15x20

Size (in.) 1 .20x25 1 20x25 2 15x20 1 20x20

Permanenti — No. ..

Size (in.)

HEAT TEMP RISE (F)

* Ratings shown for elevations up to 2000 ft above sea level. For ele

vations above 2000 ft deduct 4% capacity for each 1000 ft above

sea level

48DL002

331

3.2

M27 (1-ph) M27 (1-ph)

AHbbz^/h(J-ph) AH5527h(3-ph)

1700 1700

Vs

24 24 30 36

56/42

1 15x20 1 15x20 1 20x20

35-65 45-75

48DH002 48DL003

343 385

3 2 3.6 5 1

2 2 2

Propel ler-Type — Direct Drive; Vertical Disc

Vs Vs

Centrifugal —

80/60

80/60

48DL004

M34 M40

2000 2500

Direct Drive; Horizontal Discharge

80/60

1 20x20 1 20x20 1 .20x20

35-65 35-65

i Recommended field-supplied filter

ifBased on 0.082 in. wg pressure drop or less thru filter at 520 ft/min

48 DM004

411

3500

Vs

110/82 5 125/93 75

40

1 20x20 1 .20x20 2 20x20

face velocity.

48DH004

430

5 1

M40

2

2500 2500 2700

Vs

36

35-65 45-75

438

M40 P46

2 2

Vs

36

1 15x20

48DL045 48DL005 48DH005

450 476

5 2 5 1 5 1

large

Vs

Г

42 48

100/75

1 20x25

35-65

P53

2

2700

V,

110/82 5

1 20x25
1 25x25

2 15x20

35 65

512

P53

2

2700

Vs

48

150/112 5

1 20x25
1 .25x25

2 15x20

45-75

OUTSIDE AIR LIMITATIONS - Although there

are no restrictions on either the percentage or the
temperature of the outside air circulated thru the

unit, the rate of moisture condensation from the

combustion process increases significantly when
return air temperature drops below 50 F. Protect

the drain holes in the bottom pan against ice
buildup if outside air of below freezing tempera
ture is used

VIBRATION ISOLATION -- The unit compressor,
evaporator fan and condenser fan are mounted on
isolators to minimize vibration. Additional isola

tion is not required for slab mounting. With some
types of roof construction, however, the use of
field-furnished mbber pad type isolators may be
advisable.

Unit Rigging

1. Sling the unit perpendicularly to shipping skid
mnners. Use spreader bars to prevent damage
from sling or cable.

2. Raise unit to desired location and remove
shipping skid.

3. Mount and level the unit as indicated in Unit
Support and Mounting section.

Unit Support and Mounting

LEVELING THE UNIT — Level the unit from end
to end but pitch the unit slightly (3/8 to 1/2 in )
towards the condensate drain on the service access
face of the unit (Fig. 1). Use the unit frame as a
leveling reference.

SLAB MOUNTING — Mount the unit on a
concrete pad, cement blocks, bricks or creosoted
wood of sufficient area and strength to support the
unit weight (Table 2) without distortion or damage
and maintain the drainage pitch recommended
above.

A gravel apron will prevent grass and foliage

from obstructing the condenser air inlet (Fig. 1).
FLAT OR RECESSED ROOF MOUNTING should

be as close as possible to the roof duct opening

Place the unit on at least 2 wooden 2x4 in. or

2x6 in. sleepers.

Sleepers may be perpendicular to or parallel to
the unit mounting rails, but must span at least 2
roof joists or purlins to distribute unit weight. Set
the sleepers in roof cement or mastic. Do not plug
drain holes in the compressor or furnace
compartment.

Do not support the unit by the ends of the base
rails, nor use vibration isolators at these points.
Unit will not be properly supported and could sag
in the middle.

PITCHED ROOF MOUNTING -- Constmct a

sturdy welded or bolted frame of

1-1/2 X 1-1/2 X 1/4 in. or larger angle iron, with
frame members at right angles to unit rails. Make
provisions for securing unit to frame. Use roof
cement or mastic where frame is in contact with
roof.

%

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Ductwork Installation — For air duct system design

information, refer to Carrier System Design Man
ual, Part 2. System air flow must be within the
range of temperature rise and external static
pressure shown on the unit A.G.A. rating plate.

Bolt or screw ductwork to unit supply and
return air duct flanges and seal joints with sheet
metal flashing. Flange location and dimensions are
given in Fig. 1 and Table 1. Use flexible connectors
between ductwork and unit to dampen vibration.
If a single split duct is connected to the unit, use a
gasket to prevent air bypass between supply and
return sides.

Insulate and weatherproof all external duct
work. Secure ducts to building structure and

weatherproof all duct openings in wall or roof.
Ducts passing thru unconditioned spaces must be
insulated and provided with a vapor barrier.

Filter Installation (Field-Supplied)

1. Locate filter in return air system. Convenient
location for filter is inside building behind

return air grille. Size and number of required
filters is given in Table 2.

2. Attach filter manufacturer’s instructions to
filter rack.

retaining clip on the unit top cover. Fasten the
inlet box with sheet metal screws provided.

2. Place end of heat-shield collar (item 2) over top
cover extrusion.

3. Slide flue pipe into heat-shield collar and secure
wind cap assembly (item 1) with 3 sheet metal
screws thru wire cage eyelets.

WIND CAP
ASSEMBLY

FLUE PIPE

(PART OF WIND CAP

ASSEMSLY)

£Y£LETS(3)

■JXHEAT-SHIELC

^COLLAR

COMBUSTION

AIR INLET BOX

RETAINJNO

CLIP

TOP COVER
OF UNIT

ASSEMBLE WIND CAP AND

COMBUSTION-AIR INLET BOX

Locate — The wind cap assembly, heat-shield collar

and combustion-air inlet box (items 1, 2 and 3 of
Fig. 2) are shipped within the condenser section of
all size 003 thru 005 units except 460 volt unit.

On 460 volt, size 003 thru 005 units, only the

combustion-air inlet box is shipped within the

condenser section. The heat-shield collar and wind
cap assembly are shipped in a separate package.

On size 002 units of any voltage, the
combustion-air inlet box is inside the unit behind
the heating section access panel (Fig. 1). The

heat-shield collar and wind cap assembly are

shipped in a separate package.

Remove — On size 002 units, remove the heating

section access panel (Fig. 1) and obtain the
combustion-air inlet box.

On size 003 thru 005 units, remove 6 sheet

metal screws and lift condenser fan, grille and

orifice from the top of the condenser section (Fig.

3). Remove and discard metal banding securing the
wind cap and/or inlet box and remove the item(s)
from the condenser section.

Before replacing the condenser fan, grille and
orifice, remove any shipping tape from the con
denser fan.

Assemble (Fig. 2)

1. Mount the combustion-air inlet box (item 3) by
sliding the horizontal box flange under the

TOP COVER
EXTRUSION

FLUE BOX
EXTRUSION

HEATING SECTION

ACCESS PANEL

Fig. 2 — Wind Cap and Air Inlet Box Assembly

Fig. 3 — Removing Condenser Fan

and Orifice Assembly

PIPING AND WIRING

Gas Piping — Install piping per national and local

codes and ANSI Z223.1 entitled “Installation of
Gas Appliances and Gas Piping,” (published by
American Gas Association, 1515 Wilson Blvd.,
Arlington (Rosslyn), Va. 22209).

1. Furnish the gas line from the main gas supply
to the unit gas valve (Fig. 4).

2. Size the supply pipe for 0.3-in. wg maximum
pressure drop and for the volume of gas

required (Tables 3, 5 and 6). Pipe size must
equal or exceed size of gas connection at unit.

3. Use pipe dope approved for use with liquefied

petroleum (LP) gases.

4. Pitch all horizontal pipe runs towards the unit

1/4 in. per 15 ft to prevent trapping condensed

moisture.

5. Support piping to maintain proper pitch,
prevent strain on unit controls, and prevent
accidental movement of piping.

6. Install a tee for attachment of a dirt and
moisture drip pocket (Fig. 4). Tee should be at
same level or below gas valve connection. Drip

pocket must be protected against freeze-up.

7. Install manual shutoff valve on gas piping per
local codes.

8. Provide a ground joint union in the gas supply
line near the unit gas valve.

9. Protect gas piping from freezing temperatures.

Gas stoppage can result from failure to insulate

pipe against wide or sudden temperature

changes.

10. When piping is completed, check entire gas
assembly and field piping with soap and water
solution.

Never use an open ñame for leak testing.

Fig. 4 — Gas Piping Details

Table 3 — Maximum Pipe Cap. (cfh)^

PIPE

LENGTH (ft)

10
20 92
30 73 152

40 63 130 245
50
60
70
80
90

100

*Cfh — Cu ft/hr based on 0.3 in. wg pressure drop and 0.6 gas

specific gravity.

NOTE;
Correction is not necessary for normal number of fittings nor
for 0.7 gas specific gravity unless specified.

NOMINAL PIPE SIZE

V.

132

56 115

—

_
—

-

V

/4

278
190

105

96
90
84 160
79

1

520
350

285
215

195
180
170

150

1V4

1050

730
590
500
440
400
370
350
320
305

Table 4 — Electrical Data (60-Hz)

UNIT

Model Serie

48DL,DH

002

200

300

400

200

48DL

003

300
400

500

^00

48DL,DH,

DM004

48DL

045

300
400
500
600

200

300
400
500

600^

200

48DL,DH

005

FLA — Full Load Amps

FU — Dual Element Fuse or Circuit Breaker having high inrush

capability (max allowable amps)

ICF — Max Instantaneous Current Flow during start-up is the sum

of compressor LRA plus the FLA of all other motors in
the unit.

300
400
500
600

VOLTAGE
Norn V/Ph

230/1
208/3

208/1
230/1
208/3
230/3

___ 460A3__

'^208/l~

230/1
208/3
230/3
460/3

208/1
230/1
208/3
230/3
460/3

'208/1^

230/1
208/3
230/3
460/3

WSA FLA ICF FU

23 5 19 5
21 6
16 8

29 8

27 3

18.8 15 5
17 4

8.8

39 0
35 9

25 0

23 3

11.3
41 0

36 5

27.4
24 5
12 4

46 5
41 5
29 5

25 2

13 3

17 9
14 0

24 3

22.3
14 4

32 4 117 9
29 9 105 9
21 2
19 8 75 9

34 1
30 5

23 2
20 9

38 5 132.6 60 31 9 126 0 3 8 2.8
34 5

24.9

21.5

11.3

UNIT

102.8

7 4 31 9

10.0
115 6 60

100 6 50 23 9 94 0

10 6

112 6

IFM
LRA
OFM

WSA

COMPR OFM

FLA LRA

83 4
75 4 30
58 4

91 8
73 8

63.8

85 9 30

39.0 15

85.6 35 16 6 79 0
73 6 30 14 3 67 0 3 8 2.8
38 3 15 7 3 35 0 3 8 2 8

93.6 40 18 3
76 6

38 3 20 8 0

35
20

40 20.8

35

25
25
15

50 26 5
45

20

50 27 9 106 0
35

Indoor (Evaporator) Fan Motor
Locked Rotor Amps
Outdoor (Condenser) Fan Motor

Wire Sizing Amps per NEC equals 1.25 x FLA of the largest

motor plus the sum of all other motors in the unit.

16 1 80 0

14 5
10 6 55 0

18.8
12 0 70 0
10 9

5 5 30 0

24 0
15 3 80 0
13 9 70 0

7 0 35 0

27 5

14 9 70 0

72 0

99 0

88.0

60.0

112,0
100 0

109 0

87 0

35 0

FLA

2 0 1 4
2 0
2 0

2 4
2 4
2 4
2 4

2.4 1 4
3 1 1

3 1
3 1 2 8

3.1
3 1 2.8

3 8 2.8
3 8

3 8 2 8

3 8 2.8
3 8 2 8
3 8
3 8 2.8

1 4

1.4

1 4
1 4
1 4

1.4

2.8

2.8
2 8

2 8

2 8