Carrier 50HG014-028 User Manual

Single Package Rooftop Units

Electric Cooling with Electric Heat Option

Installation Instructions

50HG014-028

CONTENTS

Page

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23

Step 1 — Provide Unit Support. . . . . . . . . . . . . . . . . . . 1

•ROOF CURB

• ALTERNATE UNIT SUPPORT

Step 2 — Remove Shipping Rails . . . . . . . . . . . . . . . . 3

Step 3 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . 3

• POSITIONING

• ROOF MOUNT

• INSTALLATION ONTO CURB

Step 4 — Field Fabricate Ductwork . . . . . . . . . . . . . . . 8

Step 5 — Make Unit Duct Connections . . . . . . . . . . . 8

Step 6 — Trap Condensate Drain . . . . . . . . . . . . . . . . . 9

Step 7 — Make Electrical Connections . . . . . . . . . . . 9

• FIELD POWER SUPPLY

• FIELD CONTROL WIRING

Step 8 — Install Outdoor-Air Hood . . . . . . . . . . . . . . 20

Step 9 — Position Optional Power Exhaust

or Barometric Relief Damper Hood. . . . . . . . . . . . 22

Step 10 — Non-Fused Disconnect. . . . . . . . . . . . . . . 22

Step 11 — Install All Accessories . . . . . . . . . . . . . . . 23

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can
be hazardous due to system pressure and electrical compo­nents. Only trained and qualified service personnel should
install, repair, or service air-conditioning equipment.

Untrained personnel can perform the basic maintenance
functions of replacing filters. All other operations should
be performed by trained service personnel. When working
on air-conditioning equipment, observe precautions in the
literature, tags and labels attached to the unit, and other safety
precautions that may apply.

Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for unbrazing operations. Have
fire extinguishers available for all brazing operations.

Before performing service or maintenance operations on
unit, turn off main power swit ch to unit. Electrical shock
could cause personal injury.

IMPORTANT: Units have high ambient operating lim-

its. If limits are exceede d, the units will automatically

lock the compressor out of operation. Manual r eset will

be required to restart the compressor.

INSTALLATION

Step 1 — Provide Unit Support

ROOF CURB — Assemble or install accessory roof curb in
accordance with instructions shipped with this accessory. See
Fig. 1. Install insulation, cant strips, roofing, and counter flash­ing as shown. Ductwork can be installed to roof curb before
unit is set in place. Curb must be level. This is necessary to
permit unit drain to function properly. Unit leveling tolerance is

1

/16 in. per linear ft in any direction. Refer to Accessory

±
Roof Curb Installation Instructions for additional information
as required. When accessory roof curb i s used, unit may be
installed on class A, B, or C roof covering material.

IMPOR TANT: The gasketing of the unit to the roof curb

is critical for a watertight seal. Install gasket with the

roof curb as shown in Fig. 1. Improperly applied gasket

can also result in air leaks and poor unit performance.
ALTERNATE UNIT SUPPORT — When a curb cannot be

used, install unit on a noncombustible surface. Support unit
with sleepers, using unit curb support area. If sleepers cannot
be used, support long sides of unit with a minimum of 3 equal­ly spaced 4-in. x 4-in. pads on each side.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book 1 4
Ta b 1b 6 b

PC 111 Catalog No. 535-00092 Printed in U.S.A. Form 50HG-7SI Pg 1 11-03 Replaces: 50HG-3SI

Fig. 1 — Roof Curb Details

2

Step 2 — Remove Shipping Rails —

Remove ship­ping rails prior to lowering unit onto roof curb. See Fig. 2. The
rails are attached to the unit at both the return end and condens­er end. Remove the screws from both ends of each rail. Be
careful not to drop the rails onto any surface that could be dam­aged. Discard the rails. It is important to replace the screws into
the unit to avoid any air or water leakage.

Do not allow the shipping rail to drop on the roof surface.
Damage to the roof surface may result.

Step 3 — Rig and Place Unit —

Inspect unit for trans­portation damage. See Table 1 for physical data. File any claim
with transportation agency.

All panels must be in place when rigging. Unit is not
designed for handling by fork truck. Damage to unit can
result.

Do not drop unit; keep upright. Use spreader bars over unit
to prevent sling or cable damage. Rollers may be used to move
unit across a roof. Level by using unit frame as a refere nce;
leveling tolerance is ±

1

/16 in. per linear ft in any direction. See
Fig. 3 for additional information. Unit rigging weight is shown
in Fig. 3.

Four lifting holes are provided in the unit base rails as

shown in Fig. 3. Refer to rigging instructions on unit.
POSITIONING — Maintain clearance, per Fig. 4, around and

above unit to provide minimum distance from combustible
materials, proper airflow, and service access.

Do not install unit in an indoor location. Do not locate air

inlets near exhaust vents or other sources of contaminated air.

Although unit is weatherproof, guard against water from

higher level runoff and overhangs.
ROOF MOUNT — Check building codes for weight distribu-

tion requirements. Unit operating weight is shown in Table 1.
INSTALLATION ONTO CURB — The 50HG units are

designed to fit on either the accessory full perimeter curb or
onto existing 48/50TJ,HJ or 48/50DP,DR curbs. In either case,
correct placement of the unit onto th e curb is critical to operat­ing performance. To aid in correct positioning,

3

/8-in. diameter
locating holes have been added to the unit base rails. When
placing the unit, these holes should line up with the roof curb
edge as shown in Fig. 5 and 6, to assure proper duct opening
alignment. Select the alignment holes suited for the curb being
used. For installation on the HJ/TJ/DP/DR curb use the align­ment holes located approximately 20 in. from the end of t he
base rail on the return end of the unit. For placement on the HG
curb, use the alignment holes located approximately 2-in. from
the end of the base rail on the return end of the unit. See labels
on the side of the unit for more details.

SHIPPING RAILS

Fig. 2 — Shipping Rail Removal

3

Fig. 3 — Rigging Details

4

Fig. 4 — Base Unit Dimensions

5

Table 1 — Physical Data

UNIT 50HG 014 016 020

VOLTAGE

NOMINAL CAPACITY (Tons)
OPERATING WEIGHT (lb)

50 SERIES (Cooling Only)
COMPRESSOR

Quantity
Number of Refrigerant Circuits
Oil (ounces) Ckt A...Ckt B...Ckt C

REFRIGERANT TYPE

Expansion Device
Operating Charge (lb)

Circuit A
Circuit B
Circuit C

CONDENSER COIL

Rows...Fins/inch
TotalFacearea(sq.ft)

CONDENSER FAN

Nominal Cfm (Total, all fans)
Quantity...Diameter (in.)
Motor Hp...Rpm
Watts input (Total)

EVAPORATOR COIL

Rows...Fins/inch
TotalFacearea(sq.ft)

EVAPORATOR FAN

Quantity...Size
Typ e Drive
Nominal Cfm
Std Motor Hp
Alt Motor Hp
Motor Nominal Rpm
Std Maximum Continuous Bhp
Std Maximum Continuous Watts
Alt Maximum Continuous Bhp
Alt Maximum Continuous Watts
Motor Frame Size Standard
Motor Frame Size Alternate
Fan Drive Rpm Range Std motor/Std drive

Motor Bearing Type
Maximum Allowable Rpm
Motor Pulley Pitch Diameter Std motor/Std drive

Motor Shaft Diameter (in.) Standard
Motor Shaft Diameter (in.) Alternate
Belt, Quantity...Type...Length (in.) Std motor/Std drive

Pulley center line distance (in.)
Speed change per full turn of moveable

pulley flange (rpm) Std motor/Std drive

Moveable pulley maximum (full turns

from closed position)

Factory Pulley Setting

(turns from closed position)
Fan Shaft Diameter (in.)
Factory Speed Setting (rpm)

HIGH PRESSURE SWITCHES (psig)

Cutout
Reset (Auto)

OUTDOOR AIR INLET SCREENS

Quantity...Size (in.)

RETURN AIR FILTERS

Quantity...Size (in.)

Std motor/Alt drive
Alt motor/Std drive
Alt motor/Alt drive

Std motor/Alt drive
Alt motor/Std drive
Alt motor/Alt drive

Std motor/Alt drive
Alt motor/Std drive
Alt motor/Alt drive

Std motor/Alt drive
Alt motor/Std drive
Alt motor/Alt drive

LEGEND

Brake Horsepower

Bhp —

Thermostatic Expansion Valve

TXV —

208/230
and 460

575

208/230
and 460

575

208/230
and 460

12.5 12.5 15 15 17.5 17.5

2017 2017 2111 2111 2139 2139

2 2 3333
2 2 3333

72...72...NA 72...72...NA 68...68...68 68...68...68 68...68...72 68...68...72

TXV TXV TXV TXV TXV TXV

19.6 19.6 13.2 13.2 13.1 13.1

18.3 18.3 12.2 12.2 12.7 12.7
NA NA 15.4 15.4 15.2 15.2

2...17 2...17 2...17 2...17 2...17 2...17

57.78 57.78 57.78 57.78 57.78 57.78

14,000 14,000 14,000 14,000 14,000 14,000

4...22 4...22 4...22 4...22 4...22 4...22

1

/4...1100

1400 1400 1400 1400 1400 1400

3...15 3...15 3...15 3...15 3...15 3...15

23.33 23.33 23.33 23.33 23.33 23.33

2...15x11 2...15x11 2...15x11 2...15x11 2...15x11 2...15x11
Belt Belt Belt Belt Belt Belt

5000 5000 6000 6000 7000 7000

3.7 3 3.7 3 5 5
55557

1725 1725 1725 1725 1725 1725

4.25 3.45 4.25 3.45 5.75 5.75

3171 2574 3171 2574 4290 4290

5.75 5.75 5.75 5.75 8.63 8.63

4290 4290 4290 4290 6438 6438

56HZ 56H 56HZ 56H S184T 184T

S184T 184T S184T 184T S213T S213T
485-613 472-619 618-789 609-778 658-808 658-808
618-789 609-778 485-613 472-619 794-974 794-974

778-1021 778-1021 778-1021 778-1021 949-1145 949-1145

1000-1227 1000-1227 1000-1227 1000-1227 1126-1328 1126-1328

Ball Ball Ball Ball Ball Ball

1400 1400 1400 1400 1400 1400

3.7-4.7 3.1-4.1 3.4-4.4 3.4-4.4 4.3-5.3 4.3-5.3

3.4-4.4 3.4-4.4 3.7-4.7 3.1-4.1 4.3-5.3 4.3-5.3

3.1-4.1 3.1-4.1 3.1-4.1 3.1-4.1 5.4-6.6 5.4-6.6

4.3-5.3 4.3-5.3 4.3-5.3 4.3-5.3 5.5-6.5 5.5-6.5

7

/

8

1

/

1

8

1...BX...51 1...BX...48 1...A...45 1...A...45 1...BX...46 1...BX...46

1...A...45 1...A...45 1...BX...51 1...BX...48 1...BX...42 1...BX...42

1...BX...38 1...BX...38 1...BX...38 1...BX...38 1...BX...46 1...BX...46

1...B...38 1...B...38 1...B...38 1...B...38 1...BX...42 1...BX...42

11.3-12.3 11.3-12.3 11.3-12.3 11.3-12.3 10.0-12.2 10.0-12.2

21 25 29 28 25 25
29 28 21 25 30 30
41 41 41 41 33 33
38 38 38 38 34 34

6 6 6666

3 3 3333

3

/

1

16

549 546 704 694 733 733

426 426 426 426 426 426
320 320 320 320 320 320

1

/4...1100

7

/

8

11/

13/

16

8

R-22

1

/4...11001/4...11001/4...11001/4...1100

Face Split

1

/

2

7

/

8

11/

8

13/

16

7

/

8

11/

8

13/

16

13/

11/
13/

8

8

16

3...20x25 3...20x25 3...20x25 3...20x25 3...20x25 3...20x25

9...16x25 9...16x25 9...16x25 9...16x25 9...16x25 9...16x25

575

71/

11/
13/

13/

2

8

8

16

6

Table 1 — Physical Data (cont)

UNIT 50HG 024 028

VOLTAGE

NOMINAL CAPACITY (Tons)
OPERATING WEIGHT (lb)

50 SERIES (Cooling Only)
COMPRESSOR

Quantity
Number of Refrigerant Circuits
Oil (ounces) Ckt A...Ckt B...Ckt C

REFRIGERANT TYPE

Expansion Device
Operating Charge (lb)

Circuit A
Circuit B
Circuit C

CONDENSER COIL

Rows...Fins/inch
TotalFaceArea(sq.ft)

CONDENSER FAN

Nominal Cfm (Total, all fans)
Quantity...Diameter (in.)
Motor Hp...Rpm
Watts input (Total)

EVAPORATOR COIL

Rows...Fins/inch
TotalFaceArea(sq.ft)

EVAPORATOR FAN

Quantity...Size
Typ e Dri ve
Nominal Cfm
Std Motor Hp
Alt Motor Hp
Motor Nominal Rpm
Std Maximum Continuous Bhp
Std Maximum Continuous Watts
Alt Maximum Continuous Bhp
Alt Maximum Continuous Watts
Motor Frame Size Standard
Motor Frame Size Alternate
Fan Drive Rpm Range Std motor/Std drive

Motor Bearing Type
Maximum Allowable Rpm
Motor Pulley Pitch Diameter Std motor/Std drive

Motor Shaft Diameter (in.) Standard
Motor Shaft Diameter (in.) Alternate
Belt, Quantity...Type...Length (in.) Std motor/Std drive

Pulley center line distance (in.)
Speed change per full turn of moveable

pulley flange (rpm) Std motor/Std drive

Moveable pulley maximum (full turns

from closed position)

Factory Pulley Setting

(turns from closed position)
Fan Shaft Diameter (in.)
Factory Speed Setting (rpm)

HIGH PRESSURE SWITCHES (psig)

Cutout
Reset (Auto)

OUTDOOR AIR INLET SCREENS

Quantity...Size (in.)

RETURN AIR FILTERS

Quantity...Size (in.)

Std motor/Alt drive
Alt motor/Std drive
Alt motor/Alt drive

Std motor/Alt drive
Alt motor/Std drive
Alt motor/Alt drive

Std motor/Alt drive
Alt motor/Std drive
Alt motor/Alt drive

Std motor/Alt drive
Alt motor/Std drive
Alt motor/Alt drive

LEGEND

Bhp —
TXV —

Brake Horsepower
Thermostatic Expansion Valve

208/230
and 460

575 ALL

20 20 25

2187 2187 2446

33 2
33 2

72...72...72 72...72...72 110...110...NA

TXV TXV TXV

13.8 13.8 23.9

13.9 13.9 21.5

15.5 15.5 NA

2...17 2...17 2...17

57.78 57.78 66.67

14,000 14,000 21,000

4...22 4...22 6...22

1

/4...1100

1400 1400 2100

4...15 4...15 4...15

23.33 23.33 27.22

2...15x11 2...15x11 2...15x11
Belt Belt Belt

8000 8000 10,000

557

1

/

7

2

1725 1725 1725

5.75 5.75 8.63
4290 4290 6438

8.63 8.63 11.50

6438 6438 8579
S184T 184T S213T
S213T S213T S215T

658-808 658-808 799-965
794-974 794-974 939-1152

949-1145 949-1145 945-1187

1126-1328 1126-1328 1152-1366

Ball Ball Ball

1400 1400 1400

4.3-5.3 4.3-5.3 5.4-6.6

4.3-5.3 4.3-5.3 4.2-5.2

5.4-6.6 5.4-6.6 4.2-5.2

5.5-6.5 5.5-6.5 5.2-6.2

1

/

1

8

3

/

1

8

1...BX...46 1...BX...46 1...BX...50

1...BX...42 1...BX...42 2...AX...38

1...BX...46 1...BX...46 2...BX...38

1...BX...42 1...BX...42 2...BX...38

10.0-12.2 10.0-12.2 9.6-12.0

25 25 28
30 30 36
33 33 40
34 34 36

66 6

33 3

3

/

1

16

733 733 882

426 426 426
320 320 320

R-22

1

/4...1100

Face Split

71/

2

11/

8

13/

8

13/

16

1

/4...1100

13/

3...20x25 3...20x25 3...20x25

9...16x25 9...16x25 9...20x25

13/
13/

1

/

2

10

8

8

16

7

ALIGNMENT

HOLE

(IN BASE RAIL)

EDGE FLANGE

Fig. 5 — Alignment Hole Details

ALIGNMENT

HOLE SHOULD

LINE UP WITH

ROOF CURB

EDGE FLANGE

HORIZONTAL APPLICATIONS — Horizontal units are
shipped with outer panels that allow for side by side horizontal
duct connections. If specified during ordering, the unit will be
shipped with the vertical duct openings blocked off from the
factory, ready for side supply installation. If the horizontal
option was not specified at time of ordering the unit, a field­installed accessory kit is required to convert the vertical unit
into a horizontal supply configuration.

Installation of the duct block-off covers should be complet­ed prior to placing the unit unless sufficient side clearance is
available. A minimum of 66-in. is required between the unit
and any obstruction to install the duct block-off covers. Side
supply duct dimensions and locations are shown on Fig. 4.
Connect ductwork to horizontal duct flange connections on
side of unit.

ALIGNMENT
HOLES FOR

HJ, TJ, DP, DR

CURB-BOTH

SIDES

SUPPLY

OPENING

CURB
SUPPLY
OPENING

ALIGNMENT

HOLES FOR HG

CURB-BOTH

SIDES

RETURN

OPENING

CURB
RETURN
OPENING

ROOF CURB

Fig. 6 — Alignment Hole Location

Step 4 — Field Fabricate Ductwork —

Secure all
ducts to building structure. Use flexible duct connectors be­tween unit and ducts as required. Insulate and weatherproof all
external ductwork, joints, and roof openings with counter
flashing and mastic in accordance with applicable codes.

Ducts passing through an unconditioned space must be in-

sulated and covered with a vapor barrier.

Step 5 — Make Unit Duct Connections

VERTICAL CONFIGURATION — Unit is shipped for thru­the-bottom duct connections. Ductwork openings are shown in
Fig. 1 and 4. Duct connections for vertical supply and return
configuration are shown in Fig. 7. Field fabricat ed concentric
ductwork may be connected as shown in Fig. 8 and 9. The unit
is designed to attach the ductwork to the roof curb. Do not
attach duct directly to the unit basepans.

Unit basepans must be supported under the unit and around

duct openings in order to prevent air leakage.

ECONOMIZER

SEE
NOTE

AIR

IN

NOTE: Do not drill in this area; damage to basepan may result in
water leak.

SEE
NOTE

AIR

OUT

Fig. 7 — Air Distribution —
Vertical Supply and Return

ECONOMIZER

For vertical supply and return units, tools or parts could
drop into ductwork and cause an injury. Install a 90-degree
turn in the return ductwork between the unit and the condi­tioned space. If a 90-degree elbow cannot be installed, then
a grille of sufficient strength a nd density should be in stalled
to prevent objects from falling into the conditioned space.

Units with electric heat require a 1-in. clearance for the first
24 in. of ductwork. Outlet grilles must not lie directly below
unit discharge.

NOTE: A 90-degree elbow must be provided in the supply
ductwork to comply with UL (Underwriters’ Laboratories)
codes for use with electric heat.

AIR OUT

SEE
NOTE

SEE
NOTE

AIR OUT

NOTE: Do not drill in this area; damage to basepan may result in
water leak.

AIR IN

Fig. 8 — Air Distribution — Concentric Duct

8