Carrier 12, 50LJQ008 User Manual

50LJQ008,012 (50 Hz)

Single-Package Rooftop Heat Pump Units

Installation, Start-Up and 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 . . . . . . . . . . . . . . . . . 3 Step 5 Ð Make Electrical Connections . . . . . . . 7

·FIELD POWER SUPPLY

·FIELD CONTROL WIRING

·HEAT ANTICIPATOR SETTINGS

Step 6 Ð Adjust Indoor-Fan Speed . . . . . . . . . . . 13

START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17-19 SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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-side down. Seals around duct openings must be tight.

IMPORTANT: An external ®lter kit MUST be used, or the ®lters MUST be ®eld-installed outside the unit on horizontal applications with accessory economizer or two-position damper. Otherwise, the economizer or two-position must be partially removed to access the ®lters. The area of the ®eld-installed ®lters should be equal to the area of the factory-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 accessory thru-the-curb service 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-air static 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.

.

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, section C-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-AIR INLET SCREENS		Cleanable
Quantity...Size (mm)		1...508 x 635 x 25
		1...406 x 635 x 25
RETURN-AIR FILTERS		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-AIR INLET SCREENS		Cleanable
Quantity...Size (in.)		1...20 x 25 x 1
		1...16 x 25 x 1
RETURN-AIR FILTERS		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
									NOTES:
									1.		Dimensions in [ ] are in millimeters.

2. Center of gravity.

-

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-supplied splices 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-phase units, 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-off panel and single point box. Install conduit (rigid or electro-metallic tubing) 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-Fan Contactor

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, 220-3-50 and 400-3-50; 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