Carrier 48HDT User Manual

Carrier Corporation • Syracuse, N Y 13221

Connbination Heating/Cooling Units

INDEX

Page

SAFETY CONSIDERATIONS

INSTALLATION .......................................................1-16

Step 1 — Provide Unit Support

• ROOF CURB

• SLAB MOUNT

Step 2 — Field Fabricate Ductwork

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

• POSITIONING

Step 4 — Install Flue Hood

Step 5 — Trap Condensate Drain ........................... 3

Step 6 — Install Gas Piping Step 7 — Make Electrical Connections

• FIELD POWER SUPPLY

• FIELD CONTROL WIRING

• HEAT ANTICIPATOR SETTINGS

Step 8 — Make Outdoor Air Inlet Adjust

ments and Install Outdoor Air Hood

• OPTIONAL OUTDOOR AIR DAMPER

• OPTIONAL ECONOMIZER

Step 9 — Adjust Evaporator Fan Speed START-UP SERVICE

..............................................................

.................................................................

SAFETY CONSIDERATIONS

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3 3

16,17

18-22

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

Untrained personnel can perform basic mainte nance functions of cleaning coils and filters and replacing filters. All other operations should be per formed by trained service personnel. When workiog 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.

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INSTALLATION

NOTE: 004,005,006 size units in California require the installation of an accessory NOx baffle. Refer to Accessory NOx Baffle Installation Instructions for details.

Step 1 — Provide Unit Support

ROOF CURB (Downshot Units Only) — Assemble and install accessory roof curb in accordance with instructions shipped with curb. Curb details and information required to field fabricate a roof curb are shown in Fig. 1. Install insulation, cant strips,

roofing and flashing as shown. Ductwork must he

attached to curb.

Oie^sfcehsig of the roof cîïïh- is CFîîîcaJ ii>r wter i'aiegjtiij'. ïastaif ^pasîietîsîg ïoàtertaî. with the ccxif corb as

io L

Curb should be level. Unit leveling tolerance is

1/16 in. per linear foot in any direction. This is necessary for unit drain to function properly. Refer to Accessory Roof Curb Installation Instructions for additional information as required.

SLAB MOUNT (Horizontal Units Only) — Provide

a level concrete slab that extends a minimum of 6 in.

beyond unit cabinet. The slab should be 8 in. thick with 4 in. above grade. Install a gravel apron in front of condenser air inlet to prevent grass and foliage from obstructing airflow. Trap condensate drai.n. Allow for trap when pouring slab.

Step 2 — Field Fabricate Ductwork — On

downshot units secure all ducts to roof curb and

building structure.

Insulate and weatherproof all external duct

work, joints and roof openings with flashing and

mastic in accordance with applicable codes.

Ducts passing through an unconditioned space

must be insulated and covered with a vapor barrier.

A minimum clearance is not required around

ductwork. Cabinet return air static shall not exceed

-.35in.wg with economizer or -.45in.wg without

economizer.

Step 3 — Rig and Place Unit — Inspect unit for

transportation damage. File any claim with trans portation agency. Keep upright and do not drop.

Carrier Corporation 1984

Form 48H.L-7SI

Fig. 1 — Roof Curb Details

Spreader bars are not required if top crating is left on unit. Rollers may be used to move unit across a roof. Level by using unit frame as a reference, leveling tolerance is ± l/16in. per linear foot in any direction. See Fig. 2 for additional information. Weight is shown in Table 1.

Lifting holes are provided in base rails as shown in

Fig. 2. Refer to rigging instructions on unit.

POSITIONING — Maintain clearance around and above unit to provide minimum distance from com bustible materials, proper airflow and service access.

See Fig. 3 and 4.

Do not install unit in an indoor location. Do not

locate unit air inlets near exhaust vents or other

sources of contaminated air.

Although unit is weatherproof, guard against

water from higher level runoff and overhangs.

Locate mechanical draft system flue assembly at least 48 in. from any opening through which com bustion products could enter the building, and at least 48 in. from an adjacent building. When unit is located adjacent to public walkways, flue assembly must be at least 7 ft above grade.

After unit is in position, remove polyethylene shipping wrapper and rigging skids.

Step 4 — Install Flue Hood — Flue hood and

screen are shipped screwed to the basepan in furnace compartment. Remove from shipping location and using screws provided, install flue hood and screen

in location shown in Fig. 3 or 4. On 48LDT004-006

units, a flue restrictor plate MUST be assembled to

the flue discharge. The plate is shipped with the flue

hood package. Install as shown in Fig. 5.

Step 5 — Trap Condensate Drain — See Fig. 3 or

4 for drain location. A 7/8-in. preformed drain hose is shipped clamped to the indoor basepan. At instal

lation, re-route the hose so it passes through the hole

in the indoor basepan and unit base rail.

When installed properly, the hose protrudes through the base rail one inch. Replace clamp over the hose where hose passes through the basepan to ensure that hose remains level. Use a trap at least 4 in. deep and provide protection for trap against freeze-up.

Step 6 — Install Gas Piping — Unit is equipped

for use with type of gas shown on nameplate. Refer

to local building codes, or, in the absence of local codes, to ANSI Z223.1-1980 entitled National Fuel Gas Code.

Natural gas pressure at unit gas connection must

not be less than 5 in. wg or greater than 13.5 in. wg while unit is operating.

Size gas supply piping for O.Sin.wg maximum pressure drop. Do not use supply pipe smaller than unit gas connection. See Fig. 6 for typical pipe guide and location of external manual main shutoff valve.

For LP gas units, pressure at unit gas connection

must not be less than 12in. wg or greater than

13.5 in. wg. A 1/8-in. NPT plugged tapping, accessible for test

gage connection, must be installed immediately up stream of the gas supply connection to the furnace.

Step 7 — Make Electrical Connections

FIELD POWER SUPPLY

004,005,006,007 — All units except 208/230-volt units are factory wired for the voltage shown on the

nameplate. If the 208/230-v unit is to be connected to a 208 power supply, the transformer must be re wired by connecting the blue wire to C-13 and the

red wire to C-DUl.

48HDD,LDD/ HD,LD008 — 230- and 460-volt

units are factory wired for the voltage shown on

nameplate. If unit will be connected to a 208 power

supply, the transformer

ing the black wire to the 200-volt lead and insulating

the 230-volt lead.

48HHD,LHD/HH,LH008 — 230- and 460-volt

units are factory wired for the voltage shown on

nameplate. If 208/ 230-voIt unit will be connected to

a 208 power supply, the transformer must be rewired

by connecting the blue wire to C-13 and red wire to C-DUL

All Units — Refer to unit label diagram for addi tional information. Pigtails are provided for field service. Use factory-supplied splices or ULapproved copper/aluminum connector.

When installing units, provide a disconnect per

NEC.

All field wiring must comply with National Elec

trical Code and local requirements.

Install conduit connectors in side panel openings indicated in Fig. 3 or 4. Route power lines through connector to terminal connections as shown in

Fig. 7.

Voltage to compressor terminals during opera

tion must be within voltage range indicated on unit nameplate (also see Table 2). On 3-phase units, voltages between phases must be balanced within 2% and the current within 10%. Use the formula shown in Table 2, Note 2 to determine the % voltage imbalance. Contact local power company for cor

rection of improper voltage or phase imbalance. Operation on improper line voltage or excessive phase imbalance constitutes abuse and may cause damage to electrical components. Such operation, would invalidate any applicable warranty.

FIELD CONTROL WIRING ^ Install a Carrierapproved accessory thermostat assembly according to installation instructions included with the acces sory. Locate thermostat assembly on a solid wall in the conditioned space to sense average temperature.

must be rewired by connect

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Fig. 2 — Rigging Details

Table 1 — Physical Data

UNIT SIZE 48 SERIES 004 OPER WT (lb)

Unit

with Economizer

Roo f Curb 130 130

COMPRESSOR

Qty Type Oil (oz)

REFRIG (R-22) Capillary Contre

Cha rge (lb) 61

COND COIL

Row s Fins/in 170 Total F ace Area (sq ft) 6 3

COND FAN

Nom Cfm 2200 3100 Qty Diam (in ) 1 22 Motor Hp Motor Rpm

EVAP COIL

Row s 2 2 Fins/in Total F ace Area (sq ft) 5 33 5 33

EVAP FAN

Qty Size (in ) 1 10x10 1 10x10 Type Nom Cfm Motor Hp Std

Nom M otor Rpm Std/Opt Low 800/ 890

Rpm Range Std

Motor Pulley Pitch D iam (in )

Fan Pulley Pitch D iam (in )

Belt. Q ty Type. Length (in Speed Change per Full

Turn of Moveable

Pulley Flange (Rpm ) Moveable Pulley

Max Full Turns from C losed Position

Factory Setting Std Full Turns Open Opt

Factory Speed Setting Std (Rpm) Opt

FUR NACE SECTION

Tem p Rise (F) Heating Input (Btuh) Output Cap (Btuh)

Burner Orifice D iam

(in . drill size)

Natural Gas Pilot Orifice Diam

(in drill size) Natural Gas

Thermostat Heat Anticipator

Setting 460 v

HIG H-PRESS SWITCH

Cutout (psig) Reset (psig)

LOW -PRESS SW ITCH

(Suction Line) Cutout (psig) Reset (psig)

AIR INLET SCREEN S

Qty. Size (in )

RETURN AIR FILTERS

Qty Size (in )

High

208/230V

LDT

630

655

1 M4023E

850 1075

140 140

DD DD

1200 1500

Opt 3/4

'/3

— —

850/1050 1000

— — —

LDT HDT

30-60 80,000 61,600

Std Opt

Opt

005 006

HDT ] LDT HDT LDT HH

650 630

675 1 655 685 665

1 P53260 1 P6026B 1 P60-6- 1 P77

660

640 660 640 720 720

130

48 72 7 2 I 9 3 99

170 140

6 3

1 22 1 22

’/2 ’/2

3/4

— —

890 1000

—

35-65

120,000

92,400

LDT HDT

30-60 80,000 61,600

9 73 9 73 108 15 6

3800

1075 1075 1075 1075

140 140 140 13 9

5 33

HDT LDT

1 11x10

35-65

1 20,000

92,400

1 11x10 1 11x10 1 11x10 1 11x10 1

DD DD BD

2000 2000

—

1130 1050/1130

— —

—

3/4

—

890/1000

—

LDT HH

30-60 80,000 61,600

1 2 1 0

27 ± 4 67 ± 7

1 32x19xV2

1 16x25x1

1...20x25x1

006

— — — —

74 74

Copper Tube, Aluminum Plate Fins

2 : 2

14 0 140 139

Propeller Type

3800

1 22 1 22 22

’/2 '/2

3 A

5 33 6 3 8 2

HH LH

2000

’/2

3/4

1725

—

630- 960 796-1130

1 9-2 9 2 4-3 4

5 2 5 2

66 66

830 995

35-65

120,000

92,400

2000

3/4

1 1

890/1000

1050/1130

—

LH HD

30-60 80,000 61,600

007

HD HH

745 130

—

HD.HH

890 950 (HD) 125 (HD)

008

946 (LD) 125 (LD)

1 Hermetic

124

LD.LH

886

4000

2200

3/4

1725

796- 130 838-1032 (@ 2 turns open)

930-1260 352-11 27 (@ 1 turn open)

2 4-3 4 2 8-3 8

5 2 5 2

1 A 43

2 2

995

35-65

120,000

92,400

113 0

120,000

HD.HH LD.LH

35-65

92,400

35-65 203 ,000 160 ,370

132 29 113 33 132 29

036 64 033 66

15-45

114 ,000

91,200

008

HDD.H LD

945 941

1005(HDD)

125 (HDD)

2 P46

6 2 per system

4500

’/2

12x12 BD

3000

1 0

1 5

—

2 4-3 4 2 4-3 4

50 5 0

65 69

4Y2

907 885

HHD.HDD LDD.LHD

35-65

203 ,000

160 ,370

036 64

1 2 1 0

426 ± 7 320 ± 20

27 ± 4 67 ± 7

2 16x20x1 2 20x20x1

124

LDD.LHD

996 (LDD)

125 (LDD)

15-45

114 ,000

91,200

113 33

033 66

DD — Direct Drive

-----

------

■■ . •* .*

Fig. 3 — Downshot Base Unit Dimensions

Fig. 4 — Horizontal Base Unit Dimensions

Fig. 5 — Flue Hood Details;

48LDT004-006 Units

BLK-

*NPT plug is field supplied NOTE Follow all local codes

Fig. 6 — Gas Piping Guide

-YEL

-i?

FIELD POWER SUPPLY

'“dTsconnectI

230-1-60 u_PifLNJc_l

004,005,006,007 UNITS

BLK

COMP

208/230-3-60 (SEE NOTE)

■ YEL •

BLU-

FIELD POWER SUPPLY

roTsCONNECT"!

PER NEC

004,005,006,007 UNITS

-------

I—dn

H--------

EQUIP

GND

EQUIP

GND

TO INDOOR

FAN CONTACTOR

BLK •

■ YEL ■

-BLU-

FIELD POWER SUPPLY

008 UNITS

Ti^sconne'ct”!

PER NEC

EQUIP

--Q®]

H--------

GND

■ Factory Wiring . Field Wiring

NOTE If connected to 208-v power supply, rewire unit transformer no 1 by

1 Connecting blue wire from transformer no 1 to C-13

2 Connecting red wire from transformer no 1 to C-DUl

Fig. 7 — Power Wiring Connections

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