Carrier 12 User Manual

Size:
693.83 Kb
Download

50LJQ008,012 (50 Hz)

Single-PackageRooftop Heat Pump Units

Installation, Start-Upand Service

Instructions

CONTENTS

Page

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

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

Step 1 Ð Provide Unit Support . . . . . . . . . . . . . . 1

·ROOF CURB

·SLAB MOUNT

Step 2 Ð Field Fabricate Ductwork . . . . . . . . . . . 1

Step 3 Ð Make Field Connection for Condensate Disposal . . . . . . . . . . . . . . . . . . . . . . . . . 3

Step 4 Ð Rig and Place Unit . . . . . . . . . . . . . . . . . 3Step 5 Ð Make Electrical Connections . . . . . . . 7

·FIELD POWER SUPPLY

·FIELD CONTROL WIRING

·HEAT ANTICIPATOR SETTINGS

Step 6 Ð Adjust Indoor-FanSpeed. . . . . . . . . . . 13

START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17-19SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19-21

SAFETY CONSIDERATIONS

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

Untrained personnel can perform basic maintenance functions of cleaning coils and ®lters and replacing ®lters. 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 ®re extinguisher available for all brazing operations.

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

INSTALLATION

Unit is shipped in the vertical con®guration. To convert to horizontal con®guration, remove side duct opening covers. Using the same screws, install covers on vertical duct openings with the insulation-sidedown. Seals around duct openings must be tight.

IMPORTANT: An external ®lter kit MUST be used, or the ®lters MUST be ®eld-installedoutside the unit on horizontal applications with accessory economizer ortwo-positiondamper. Otherwise, the economizer ortwo-positionmust be partially removed to access the ®lters. The area of the®eld-installed®lters should be equal to the area of thefactory-installed®lters.

Step 1 Ð Provide Unit Support

ROOF CURB Ð Assemble and install accessory roof curb in accordance with instructions shipped with curb. See Fig. 1. Install insulation, cant strips, roo®ng and counter ¯ashing as shown. Ductwork must be attached to curb, not to the unit. If electric or control power is to be routed through the curb, attach the accessorythru-the-curbservice connection plates to the roof curb in accordance with the accessory installation instructions. Connection plates must be installed before unit is set in roof curb.

IMPORTANT: The gasketing of the unit to the roof curb is critical for a watertight seal. Install gasket supplied with the roof curb as shown in Fig. 1. Improperly applied gasket also can result in air leaks and poor unit performance.

Curb should be level. Unit leveling tolerances are shown in Fig. 2. 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) Ð Provide a level concrete slab that extends a minimum of 152 mm (6 in.) beyond unit cabinet. The slab should be 203 mm (8 in.) thick with 102 mm (4 in.) above grade. Install a gravel apron in front of outdoor coil air inlet to prevent grass and foliage from obstructing air¯ow. In areas where high snowfall occurs, increase height of slab to ensure that snow does not block coil.

NOTE: Horizontal units may be installed on a roof curb if required.

Step 2 Ð Field Fabricate Ductwork Ð On vertical discharge units, secure all ducts to roof curb and building structure. Do not connect ductwork to unit. For horizontal applications, ®eld-supplied ¯anges should be attached to horizontal discharge openings and all ductwork attached to the ¯anges. Insulate and weatherproof all external ductwork, joints and roof openings with counter ¯ashing and mastic in accordance with applicable codes.

Ducts passing through an unconditioned space must be insulated and covered with a vapor barrier.

If a plenum return is used on a vertical unit, the return should be ducted through the roof deck to comply with applicable ®re codes.

A minimum clearance to combustibles is not required around ductwork on vertical discharge units. On horizontal discharge units, a minimum clearance of 25 mm (one in.) is required for the ®rst 305 mm (12 in.) of ductwork.

Cabinet return-airstatic shall not exceed −87 Pa (−.35 in. wg) with economizer or −112 Pa (−.45 in. wg) without economizer.

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

Catalog No. 015-015

Printed in U.S.A.

Form 50LJQ-C1SI

Pg 1

1-92

Replaces: New

ROOF CURB

``A''

UNIT SIZE

ACCESSORY

 

 

50DJ901371

18-29

 

[356]

 

 

50LJQ008,012

50DJ901381

28-09

[610]

 

 

 

UNIT SIZE

``F'' POWER

``G'' CONTROL

CONNECTOR

PKG. ACC.

 

 

 

50LJQ008,012

19 [25] NPT or

3¤49 [19] NPT

50DJ901311

29 [51] NPT

 

 

 

NOTES:

1.Roof curb accessory is shipped unassembled.

2.Insulated panels: 25 mm (one in.) thick polyurethane foam, .8 Kg (13¤4 lb) density.

3.Dimensions in [ ] are in millimeters.

4.Roof curb: 16-gagesteel.

5.Attach ductwork to curb (¯anges of duct rest on curb).

6.Service clearance 1219 mm (4 ft) on each side.

7. Direction of air¯ow.

8.Control and power service plates are part of a separately shipped accessory package.

Fig. 1 Ð Roof Curb Dimensions

2

MAXIMUM ALLOWABLE DIFFERENCE

A-B

 

B-C

 

A-C

 

mm

 

in.

mm

 

in.

mm

 

in.

13

 

.5

25

 

1.0

25

 

1.0

Fig. 2 Ð Unit Leveling Tolerance

Step 3 Ð Make Field Connection for Condensate Disposal Ð Units must have an external trap added. See Fig. 3. A 3¤4-in. FPT connection is located on the side of the unit. Use a trap at least 100 mm (4 in.) deep, and protect against freeze-up.

If drain line is run to a drain, pitch line away from unit at 25 mm (one in.) per 3 m (10 ft) of run. Do not use a pipe size smaller than the unit connection.

Step 4 Ð Rig and Place Unit Ð Inspect unit for transportation damage. File any claim with transportation agency. Keep unit upright and do not drop. 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. See Tables 1A and 1B and Fig. 4 for additional information. Operating weight is shown in Tables 1A and 1B and Fig. 4.

Lifting holes are provided in base rails as shown in Fig. 4 and 5. Refer to rigging instructions on unit.

NOTES:

1. Dimensions in ( ) is in millimeters.

2.Hood rigging shackles through holes in base rail, as shown in detail ``A''. Holes in base rails are centered around the unit center of gravity. Use wooden top skid when rigging to prevent rigging straps from damaging unit.

3.Weights do not include economizer. See Tables 1A and 1B for economizer weights.

All panels must be in place when rigging.

All panels must be in place when rigging.

POSITIONING Ð Maintain clearance around and above unit to provide proper air ¯ow and service access. See Fig. 5.

Position unit on roof curb so that the following clearances are maintained; 6 mm (1¤4 in.) clearance between roof curb and base rails on each side and front of unit: 29 mm (15¤32 in.) clearance between roof curb and rear of unit (see Fig. 1, sectionC-C).

Do not install unit in an indoor location. Do not locate unit air inlet near exhaust vents or other sources of contaminated air.

Although unit is weatherproof, guard against water from higher level runoff and overhangs.

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

NOTE: Trap should be deep enough to offset maximum unit static difference. A 100 mm (4 in.) trap is recommended.

Fig. 3 Ð External Trap Condensate Drain

UNIT

MAX

 

 

DIMENSIONS

 

 

WEIGHT

``A''

``B''

``C''

50LJQ

 

lb

kg

in.

mm

in.

mm

in.

mm

008

840

381

87.38

2219

40.25

1022

41.31

1050

012

940

426

87.38

2219

40.25

1022

48.31

1253

 

 

 

 

 

 

 

 

 

Fig. 4 Ð Rigging Details

3

Table 1A Ð Physical Data (SI)

BASE UNIT 50LJQ

008

 

012

NOMINAL CAPACITY (kW)

23.2

 

28.8

OPERATING WEIGHT (kg)

 

 

 

Unit

381

 

426

With Economizer

401

 

446

Roof Curb

101

 

101

COMPRESSOR

 

Hermetic

Quantity

2

 

2

Oil (ml) (each compressor)

1627

 

2071

REFRIGERANT TYPE

 

R-22

Operating Charge (kg)

 

 

 

Circuit 1

3.7

 

4.0

Circuit 2

3.2

 

3.9

OUTDOOR FAN

 

Propeller

Quantity...Diameter (mm)

1...660

 

1...660

Nominal L/s

2900

 

3260

Motor BkW...r/s

.25...16.0

 

.25...16.0

OUTDOOR COIL

Enhanced Copper Tubes, Aluminum Fins, Acutrol™ Feed Device

Rows...Fins/m

2...669

 

2...669

Total Face Area (sq m)

1.9

 

2.3

INDOOR FAN

 

Centrifugal

Size (mm)

381 x 381

 

381 x 381

Type Drive

Belt

 

Belt

Nominal L/s

1200

 

1600

Motor BkW per NEC*

1.12

 

1.50

Maximum Continuous BkW

1.79

 

2.16

Motor Frame

56

 

56

Fan r/s Range

10.30-14.70

 

11.50-15.00

Motor Bearing Type

Ball

 

Ball

Maximum Fan r/s

26.7

 

26.7

Motor Pulley Pitch Diameter

61/86

 

86/112

A/B (mm)

 

 

 

 

Fan Pulley Pitch Diameter (mm)

140

 

178

Belt Ð Type...Length (mm)

A...1219

 

A...1295

Pulley Center Line Distance (mm)

425-489

 

464-527

Fan Shaft Diameter at Pulley (mm)

25

 

25

Speed Change per Full Turn of

.88

 

.70

Movable Pulley Flange (r/s)

 

 

 

 

Movable Pulley Maximum Full

5

 

5

Turns from Closed Position

 

 

 

 

Factory Setting Ð Full Turns Open

5

 

5

Factory Speed Setting (r/s)

10.3

 

11.5

INDOOR COIL

Enhanced Copper Tubes, Aluminum Double Wavy Fins,

Rows...Fins/m

 

Acutrol Feed Device

3...590

 

3...590

Total Face Area (sq m)

.74

 

.93

OUTDOOR-AIRINLET SCREENS

 

Cleanable

Quantity...Size (mm)

 

1...508 x 635 x 25

 

1...406 x 635 x 25

 

 

RETURN-AIRFILTERS

 

Disposable

Quantity...Size (mm)

4...406 x 508 x 50

 

4...508 x 508 x 50

LEGEND

BkW Ð Brake Kilowatt

NEC Ð National Electrical Code (U.S.A. Standard) *Used to determine wire sizing per NEC.

4

Table 1B Ð Physical Data (English)

BASE UNIT 50QJ

008

 

012

NOMINAL CAPACITY (tons)

6.6

 

8.2

OPERATING WEIGHT (lb)

 

 

 

Unit

840

 

940

With Economizer

884

 

984

Roof Curb

223

 

223

COMPRESSOR

 

Hermetic

Quantity

2

 

2

Oil (¯uid oz) (each compressor)

55

 

70

REFRIGERANT TYPE

 

R-22

Operating Charge (lb-oz)

 

 

 

Circuit 1

8-2

 

8-14

Circuit 2

7-0

 

8-10

OUTDOOR FAN

 

Propeller

Quantity...Diameter (in.)

1...26

 

1...26

Nominal Cfm

6100

 

6900

Motor Hp...Rpm

1¤3...960

 

1¤3...960

OUTDOOR COIL

Enhanced Copper Tubes, Aluminum Fins, Acutrol™ Feed Device

Rows...Fins/in.

2...17

 

2...17

Total Face Area (sq ft)

20.5

 

25.0

INDOOR FAN

 

Centrifugal

Size (in.)

15 x 15

 

15 x 15

Type Drive

Belt

 

Belt

Nominal Cfm

2600

 

3400

Horsepower per NEC*

1.5

 

2.0

Maximum Continuous Bhp

2.4

 

2.9

Motor Frame

56

 

56

Fan Rpm Range

622-882

 

692-896

Motor Bearing Type

Ball

 

Ball

Maximum Fan Rpm

1600

 

1600

Motor Pulley Pitch Diameter

2.4/3.4

 

3.4/4.4

A/B (in.)

 

 

 

 

Fan Pulley Pitch Diameter (in.)

5.5

 

7.0

Belt Ð Type...Length (in.)

A...48

 

A...51

Pulley Center Line Distance (in.)

16.75-19.25

 

18.25-20.75

Fan Shaft Diameter at Pulley (in.)

1

 

1

Speed Change per Full Turn of

52

 

42

Movable Pulley Flange (rpm)

 

 

 

 

Movable Pulley Maximum Full

5

 

5

Turns from Closed Position

 

 

 

 

Factory Setting Ð Full Turns Open

5

 

5

Factory Speed Setting (Rpm)

620

 

690

INDOOR COIL

Enhanced Copper Tubes, Aluminum Double Wavy Fins,

Rows...Fins/in.

 

Acutrol Feed Device

3...15

 

3...15

Total Face Area (sq ft)

8.0

 

10.0

OUTDOOR-AIRINLET SCREENS

 

Cleanable

Quantity...Size (in.)

 

1...20 x 25 x 1

 

1...16 x 25 x 1

 

 

RETURN-AIRFILTERS

 

Disposable

Quantity...Size (in.)

4...16 x 20 x 2

 

4...20 x 20 x 2

LEGEND

Bhp Ð Brake Horsepower

NEC Ð National Electrical Code (U.S.A. Standard) *Used to determine wire sizing per NEC.

5

UNIT

STD. UNIT

ECONOMIZER

CORNER

CORNER

CORNER

CORNER

``H''

``J''

``K''

 

WEIGHT

WEIGHT

WEIGHT ``A''

WEIGHT ``B''

WEIGHT ``C''

WEIGHT ``D''

 

50LJQ

 

 

 

 

 

 

 

Lb

Kg

Lb

Kg

Lb

Kg

Lb

Kg

Lb

Kg

Lb

Kg

Ft-in.

mm

Ft-in.

mm

Ft-in.

 

mm

 

 

008

840

381

44

20

182

83

156

71

231

105

271

123

2-07¤8

632

3-55¤16

1050

2-911¤16

 

856

012

940

426

44

20

204

93

174

79

259

117

303

137

1-27¤8

378

4-15¤16

1253

3-03¤8

 

924

 

 

CONNECTION SIZES

A

13¤89

dia [35] ®eld power supply hole

B

21¤29

dia [64] power supply knockout

C

13¤49

dia [44] charging-porthole

D

7¤89 dia [22] ®eld control wiring hole

E

3¤49-14NPT condensate drain

F

29 dia [51] power supply knockout

 

 

 

NOTES:

1.Dimensions in [ ] are in millimeters.

2.Center of gravity.

3. Direction of air¯ow.

4.Ductwork to be attached to accessory roof curb only.

5.Minimum clearance (local codes or jurisdiction may prevail):

a.Bottom to combustible surfaces (when not using curb) 25 mm (one in.).

b.Condenser coil, for proper air¯ow, 914 mm (36 in.) one side, 305 mm (12 in.) the other. The side getting the greater clearance is optional.

c.Overhead 1524 mm (60 in.) to assure proper outdoor fan operation.

d.Between units, control box side, 1067 mm (42 in.).

e.Between unit and ungrounded surfaces, control box side, 914 mm (36 in.).

f.Between unit and block or concrete walls and other grounded surfaces, control box side 1067 mm (42 in.).

g.Horizontal supply and return end, zero mm (zero in.).

6.With the exception of the clearance for the outdoor coil as stated in notes 5b and c, a removable fence or barricade requires no clearance.

Fig. 5 Ð Base Unit Dimensions

6

Step 5 Ð Make Electrical Connections

Unit cabinet must have uninterrupted, unbroken electrical ground to minimize the possibility of personal injury if an electrical fault should occur. This ground may consist of electrical wire connected to unit ground lug in control compartment, or conduit approved for electrical ground when installed in accordance with U.S.A. National Electrical Code (Ref: ANSI/NFPA 70-1987)or equivalent local electrical codes. Failure to follow this warning could result in the installer being liable for personal injury of others.

FIELD POWER SUPPLY Ð Pigtails are provided for ®eld wire connections. Use factory-suppliedsplices or copper/ aluminum connector.

When installing units, provide a disconnect per local codes. All ®eld wiring must comply with local requirements.

Install conduit through side panel openings. For units without electric heat, install conduit between disconnect and control box. Install power lines to terminal connections as shown in Fig. 6. For units with electric resistance heat, refer to Table 2 to determine appropriate power wiring ®gure (Fig.7-13)and route lines as indicated in appropriate ®gure.

Voltage to compressor terminals during operation must be within voltage range indicated on unit nameplate (also see Table 2). On 3-phaseunits, voltages between phases must be balanced within 2% and the current within 10%. Use the formula shown in Table 2, Note 3 to determine the % voltage 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 Carrier warranty.

When electric heat is installed, remove knockouts for appropriate size conduit from unit block-offpanel and single point box. Install conduit (rigid orelectro-metallictubing) through conduit drip boot as shown in Fig. 14. Drip boot eliminates the need for water tight conduit ®ttings at the single point box. Refer to Fig. 15 for component locations.

LEGEND

C Ð Contactor

IFC Ð Indoor-FanContactor

TB Ð Terminal Block

Field Wiring

Factory Wiring

Splice Connection (Factory Supplied)

Fig. 6 Ð Power Wiring Connections

LEGEND

FOR FIG. 7-13

EQUIP

Ð

Equipment

FU

Ð

Fuse

GND

Ð

Ground

HTR

Ð

Heater

TB

Ð

Terminal Block

Fig. 7 Ð Electric Heater Power Wiring Connections Ð 50LJQ, 220-3-50and400-3-50;Single Point Kit 50DJ902021 and 50DJ902071

7

Fig. 8 Ð Electric Heater Power Wiring Connections Ð 50LJQ, 400-3-50;Single Point Kit 50DJ902041 and 50DJ902101

Fig. 9 Ð Electric Heater Power Wiring Connections Ð 50LJQ, 400-3-50;Single Point Kit 50DJ902061 and 50DJ902121

8

Fig. 10 Ð Electric Heater Power Wiring Connections Ð 50LJQ, 220-3-50;Single Point Kit 50DJ902031 and 50DJ902081

Fig. 11 Ð Electric Heater Wiring Connections Ð 50LJQ, 220-3-50;Single Point Kit 50DJ902051 and 50DJ902111

LEGEND FOR FIG. 7-13

EQUIP

Ð Equipment

FU

Ð Fuse

GND

Ð Ground

HTR

Ð Heater

TB

Ð Terminal Block

9

Fig. 12 Ð Electric Heater Power Wiring Connections Ð 50LJQ, 220-3-50;Single Point Kit 50DJ902091

Fig. 13 Ð Electric Heater Power Wiring Connections Ð 50LJQ, 220-3-50;Single Point Kit 50DJ902131

LEGEND

FOR FIG. 7-13

EQUIP

Ð

Equipment

FU

Ð

Fuse

GND

Ð

Ground

HTR

Ð

Heater

TB

Ð

Terminal Block

10