Carrier 50TJM User Manual

Package Rooftop Units

Quality Assurance

Certificate Reg. No: 04 100 950420

Subject to change without notice	Installation, Operation and Maintenance Instructions
Manufacturing point: Jeddah, Saudi Arabia
Nearest port of embarkation: Jeddah Islamic port
Product classification: Commercial

50TJM

Nominal Cooling Capacity 15 - 28 Tons

HFC R-410A Refrigerant

Note: This manual discusses the Mechanical Installation of this unit, Start-up Procedures, Operating Sequences and Service Instructions.

Read thoroughly the entire installation instruction manual before starting the unit installation, to get familiarized with all steps and to identify if any additional reference materials as required.

The 50TJM units are single side discharge rooftop cooling unit utilizing electric heat as an option. Units are prewired, pre-charged with R-410A refrigerant, and tested at the factory. These units can be placed on the side of a building or can be placed on a roof without roof curbs. Each unit is designed to occupy a minimal space. Piping and drain connections are readily accessible.

For a complete list of options and accessories, refer to the Product Data Catalog.

Contact your local Carrier representative for additional reference materials.

Page 1

Table of Contents
1.0 – SAFETY CONSIDERATIONS .......................................................................................................		3
1.1	– General .............................................................................................................................	3
1.2	– Installation Safety Considerations.....................................................................................	3
1.3	– Warranty............................................................................................................................	3
Physical Data.........................................................................................................................................		5
Unit Dimensional Drawing..............................................................................................................		6 – 7
2.0 – INSTALLATION.............................................................................................................................		8
2.1	– Jobsite Survey...................................................................................................................	8
2.2	– Plan for Unit Location........................................................................................................	8
2.3	– Rig and Place Unit ............................................................................................................	8
2.4	– Positioning and Clearance ................................................................................................	9
2.5	– Field Fabricate Ductwork ..................................................................................................	9
2.6	– Make Unit Duct Connections ............................................................................................	9
2.7	– Trap Condensate Drain...................................................................................................	10
2.8	– Outdoor Air-Vent .............................................................................................................	10
2.9	– Make Electrical Connections...........................................................................................	10
Electrical Data .....................................................................................................................................		11
Electrical Resistance Heater Data .....................................................................................................		12
Typical Wiring Schematic...........................................................................................................		13 – 14
3.0 – START–UP INSTRUCTIONS ......................................................................................................		15
3.1	– Unit Preparation ..............................................................................................................	15
3.2	– Internal Wiring.................................................................................................................	15
3.3	– Compressor Mounting.....................................................................................................	15
3.4	– Refrigerant Service Ports................................................................................................	15
3.5	– Compressor Rotation ......................................................................................................	15
3.6	– Evaporator Fan ...............................................................................................................	15
3.7	– Condenser Fans and Motors ..........................................................................................	16
3.8	– Return – Air Filters ..........................................................................................................	16
3.9	– Base Unit Operation........................................................................................................	16
4.0 – SERVICE .....................................................................................................................................		16
4.1	– Cleaning ..........................................................................................................................	16
4.2	– Lubrication.......................................................................................................................	16
4.3	– Evaporator Fan Performance Adjustment ......................................................................	17
4.4	– Evaporator Fan Service and Replacement.....................................................................	17
4.5	– Belt Tension Adjustment .................................................................................................	18
4.6	– Condenser – Fan Adjustment .........................................................................................	18
4.7	– Refrigerant Charge..........................................................................................................	18
4.8	– Protective Devices ..........................................................................................................	18
4.9	– Control Circuit, 24 – V.....................................................................................................	19
5.0 – REPLACEMENT PARTS ............................................................................................................		19
Fan Performance Table ..............................................................................................................		20 – 23
Cooling Chart ..............................................................................................................................		24 – 25
Troubleshooting..................................................................................................................................		26
Start–up Check List ............................................................................................................................		27

Page 2

1 – SAFETY CONSIDERATIONS

1.1 – General

Improper installation, adjustment, alteration, service, maintenance or use can cause explosion, fire, electrical shock or other conditions which may cause personal injury or property damage. Consult a qualified installer; service agency must use factory-authorized kits or accessories when modifying this product. Refer to the individual instructions packaged with the kits or accessories when installing.

Follow all the safety codes. Wear safety glasses and work gloves. Use quenching cloths for brazing operations and have a fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions attached to the unit. Consult local building codes for special requirements. In absence of local codes, it is recommended that the USA standard ANSI/NFPA 70, National Electrical Code (NEC), be followed.

It is important to recognize safety information. This is the safety-alert symbol . When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury.

Understand the signal words DANGER, WARNING, CAUTION, and NOTE. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury of death. WARNING signifies hazards which could result in personal injury or death. CAUTION is used to identify unsafe practices, which may result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation.

1.2 – Installation Safety Considerations

After the unit has been received and when it is ready to be installed or reinstalled, it must be inspected for damage. If damage is detected upon receipt, immediately file a claim with the shipping company or repair.

This machine must be installed in a location that is not accessible to the public and protected against access by non-authorized people.

This machine must not be installed in an explosive atmosphere.

Do not remove the skid or the packaging until the unit is in its final position. These units can be moved with a fork lift truck, as long as the forks are positioned in the right place and direction on the unit.

The units can also be lifted with slings, using only the designated lifting points marked on the unit (labels on the chassis and a label with all unit handling instructions are attached to the unit). Use slings with the correct capacity, and always follow the lifting instructions on the certified drawings supplied for the unit.

Safety is only guaranteed, if these instructions are carefully followed. If this is not the case, there is a risk of material deterioration and injuries to personnel. These units are not designed to be lifted from above.

1.3 – Warranty

Warranty is based on the general terms and conditions of the manufacturer. Any modifications to the design and/or installation made without discussion with Carrier and without advance written agreement will result in the loss of the right to any warranty claims and any claim for injury to personnel as a result of these modifications.

Page 3

WARNING

ELECTRIC SHOCK HAZARD

Failure to follow this warning could cause personal injury or death.

Before performing service or maintenance operations on unit, always turn off main power switch to unit and install lockout tag. Unit may have more than one power switch.

CAUTION

CUT HAZARD

Failure to follow this warning could cause personal injury.

Sheet metal parts may have sharp edges or burrs. Use care and wear appropriate protective clothing, safety glasses and gloves when handling parts and servicing air conditioning equipment

WARNING

UNIT OPERATION AND SAFETY

HAZARD

Failure to follow this warning could cause personal injury, death and /or equipment damage.

Puron® (R-410A) refrigerant systems operate at higher pressures than standard R-22 systems. Do not use R-22 service equipment or components on Puron® refrigerant equipment.

WARNING

PERSONAL SAFETY AND ENVIRONMENTAL

HAZARD

Failure to follow this warning could cause personal injury or death damage.

Relieve pressure and recover all refrigerant before system repair or final unit disposal. Wear safety glasses and gloves when handling refrigerants. Keep torches and other ignition sources away from refrigerants and oils.

NOTE

IMPORTANT

Units have high ambient operation limits. If limits are exceeded, the unit will automatically lock the compressor out of operation. Manual reset will be required to restart the compressor.

Page 4

Physical Data Table - 1

50TJM Unit Physical Data (50Hz) (English)

Unit 50TJM Size	18	24		28		34
Unit Dimensions	Page - 9				Page - 10
Unit Operating Weight	Page - 9				Page - 10
Refrigeration System
Compressor No. / Type		2 / Scroll
Stage Of Capacity Control (%)		50 / 50
Refrigerant Type		Puron ® R410A
Circuts No.			2
Charge Per Circuit (Down / Up) -LBS	15.96 / 15.96	22.19 / 25.62		31.19 / 29.19		31.62 / 31.37
Metering Device		TXV -		Adjustable
Filter Drier Qty / Size	2 / DML085S				2 / DMS165S
High Pressure Switch (Trip / Reset) - PSIG		630		/ 480
Low Pressure Switch (Trip / Reset) - PSIG		54 / 70
Freeze Protection Thermostat (Open / Close) ±1.8 0F		-18 / -14
Condenser Coil
Coil Type	Copper Tube, Aluminum Double Wavy Fins					Copper Tube,
						Aluminum LSW
						Fins
Standard Coil Material		Copper / Aluminium
Qty x Rows x FPI	1 x 3 x 16	1 x 4 x 16			2 x 3 x 17
Qty x Face Area (ft2)	1 x	26.7			2 x 28.8
Coil Test Pressure (PSIG)			450
Condenser Fan & Motor
Approx. Air Flow Rate (CFM)	12000	13000		18200		16700
Quantity			2
Diameter (in) / No. of Blades	30 / 4				30 / 6
Motor Type		Induction Motor -		Totally Enclosed
Motor HP / RPM		1 / 950
Evaporator Coil
Coil Type		Copper Tube, Aluminum LSW Fins.
Standard Coil Material		Copper / Aluminium
Qty x Rows Qty x FPI	2 x 3 x 17				2 x 4 x 17
Qty x Face Area (ft2)	2 x 9.75				2 x 10.3
Coil Test Pressure			350
Drain Pan connection Size (in)			3/4
Return Air Filter Qty x Size (in)	4 x 33.8 x 21.7				4 x 35.4 x 21.7
Evaporator Fan and Motor Section
Fan Quantity / Fan Size (in)	1 / 15.75 x 15.75				1 / 17.7 x 17.7
Fan Type		Centrifugal -		Forward Blade
Drive Type			Belt
Motor Type		Induction Motor - TEFC
Motor BHP	4.0		5.5			7.5
Motor Frame Size / Motor Shaft Diameter (mm)	100 / 28	112 / 28				132 / 38
Motor Pulley Pitch Diameter (Min / Max) (in)		3.7 / 4.7				4.3 / 5.6
Fan RPM Range (RPM)	1030 - 745	1041 - 753				1029 - 740
Fan Pulley Pitch Diameter (in)		6.6				8.4
Belt, Quantity...Type		1 ... BX66				1 ... BX71
Pulley Center To Center Distance(in)		24.4 - 27.51
Movable Pulley Maximum Full Turns From Closed			6
Position
Approx.Speed Change Per Full Turn Of Movable			48
Pulley Flange (rpm)
Factory Speed Turns Setting		4				1.5
Factory Belt Standard Deflection (in) @ Force (Lb)	0.39 @ 4.65 Lb	0.39 @ 5.99 Lb				0.40 @ 6.63 Lb

Page 5

UNIT DIMENSIONAL DRAWING: 50TJM - 18 and 50TJM - 24 (Fig - 1)

	SHIPPING DIMENSIONS (mm)				CORNER WEIGHT (Kg)						CENTER OF GRAVITY (mm)
UNIT	LENGTH	WIDTH	DEPTH	A	B	C	D		TOTAL	K		L		M
50TJM - 18	2440	2235	1375	192	178	236	254		860	1050		1050		450
50TJM - 24				197	182	241	260		880

NOTES:

1.Dimensions are in millimeters.

2. Center of Gravity.

3. Direction of Airflow

4. Minimum clearance:

REAR: 2134mm for coil removal. This dimension can be reduced to 1219mm if conditions permit coil removal from the top. TOP: 1829mm to assure proper condenser fan operation.

SIDE: 1219mm for Compressor, Filter and Control boxes access.

-Local codes or jurisdiction may prevail.

5.With the exception of clearance for the condenser coil and the damper / power exhaust as stated in Note no. 6, a removal fence or barricade requires no clearance.

6.Dimensions are from outside of corner post. Allow 8mm on each side for top cover drip edge.

7.Weights are Given for aluminim evaporator and condenser coil plate fins

Page 6

UNIT DIMENSIONAL DRAWING: 50TJM - 28 and 50TJM - 34 (Fig - 2)

		SHIPPING DIMENSIONS (mm)				CORNER WEIGHT (Kg)						CENTER OF GRAVITY (mm)
UNIT		LENGTH	WIDTH	DEPTH	A	B	C	D		TOTAL	K		L		M
50TJM - 28		3200	2485	1400	248	226	310	340		1125	1350		1160		450
50TJM -	34				254	231	317	348		1150

NOTES:

1.Dimensions are in millimeters.

2. Center of Gravity.

3.Direction of Airflow

4.Minimum clearance:

REAR: 2134mm for coil removal. This dimension can be reduced to 1219mm if conditions permit coil removal from the top.

TOP: 1829mm to assure proper condenser fan operation.

SIDE: 1219mm for Compressor, Filter and Control boxes access.

-Local codes or jurisdiction may prevail.

5.With the exception of clearance for the condenser coil and the damper / power exhaust as stated in Note no. 6, a removal fence or barricade requires no clearance.

6.Dimensions are from outside of corner post. Allow 8mm on each side for top cover drip edge.

7.Weights are Given for aluminim evaporator and condenser coil plate fins

Page 7

2 – INSTALLATION

2.1 – Jobsite Survey

Complete the following checks before installation.

1.Consult local building codes or the U.S.A. National Electrical Code (Ref: ANSI/NFPA 70, [American National Standards Institute/National Fire Protection Association], latest revision) for special installation requirements.

2.Determine unit location (from project plans) or select unit location.

3.Check for possible overhead obstructions which may interfere with unit lifting or rigging.

2.2 – Plan for Unit Location

Select a location for the unit and its support system (curb or other) that provides for the minimum clearances required for safety. This includes the clearance to combustible surfaces, unit performance and service access below, around and above unit as specified in Fig - 3. For the centre of gravity coordinates, the position of the unit mounting holes, and the weight distribution points, refer to the unit dimensional drawing Fig - 1 and Fig - 2.

Fig. 3 Unit Clearance Diagram

NOTES:

1. Minimum clearance:

REAR: 2134mm for coil removal. This dimension can be reduced to 1219mm if conditions permit coil removal from the top.

TOP: 1829mm to assure proper condenser fan operation.

SIDE: 1219mm for Compressor, Filter and Control boxes access.

-Local codes or jurisdiction may prevail.

2.With the exception of clearance for the condenser coil and the damper / power exhaust as stated in Note no. 3, a removal fence or barricade requires no clearance.

3.Dimensions are from outside of corner post. Allow 8mm on each side for top cover drip edge.

2.3– Rig and Place Unit

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; leveling tolerance is± 1/16 in. per linear ft in any direction.

Four lifting holes are provided in ends of unit base rails as shown in Fig – 4 Refer to rigging instructions on unit.

Fig. 4 Rigging Diagram

Roof mount - Check building codes for weight distribution requirements. Unit weight and dimensions is shown in unit dimensional drawing Fig 1 and Fig 2 on page 6 & 7 and table 2.

NOTE: Consider also the effect of adjacent units.

Page 8

	SHIPPING DIMENSIONS			SHIPPING	UNIT DIMENSIONS (mm)			UNIT WEIGHT
UNIT		(mm)		WEIGHT
	LENGTH	WIDTH	DEPTH	GROSS (Kg)	LENGTH	WIDTH	DEPTH	NET(Kg)
50TJM - 18	2440	2235	1375	925	2440	2182	1348	860
50TJM - 24	2440	2235	1375	945	2440	2182	1348	880
50TJM - 28	3200	2485	1400	1190	3200	2432	1374	1125
50TJM - 34	3200	2485	1400	1215	3200	2432	1374	1150

Table – 2 Unit Weights and Dimensions

NOTES:

1.Remove boards at ends of unit and runners prior to rigging.

2.Rig by inserting hooks into unit base rails as shown. Use bumper boards for spreader bars.

NOTE		CAUTION

IMPORTANT

All units are internally isolated against vibration. If extra isolation required, please see “Unit Dimensional Drawing” Fig - 1 and Fig - 2 for corner weights.

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage.

All panels must be in place when rigging.

2.4 – Positioning and Clearance.

Before positioning the unit, check the following:

•The permitted loading at the site is adequate or that appropriate strengthening measures have been taken.

•The unit is installed level on an even surface (maximum tolerance is 5 mm in both axes).

•Ensure access to the components (see “Unit Dimensional Drawings” Fig 1 & 2 & “Clearance Diagram” Fig 3).

•The number of support points is adequate and that they are in the right places.

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

Unit may be installed directly on wood flooring or on approved roof - covering material when roof curb is used. Do not install unit in an indoor location. Do not locate air inlets near exhaust vents or sources of contaminated air.

2.5 – Field Fabricate Ductwork

Secure all ducts to building structure. Use flexible duct connectors between unit and ducts as required (a space for 2.5 to 3ft is required in case of repairing or replacing the blower wheel). 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 insulated and covered with a vapor barrier.

The 50TJM units with electric heat require a 2-in.clearance for the first 24-in. of ductwork. Outlet grilles must not lie directly below unit discharge.

NOTE

IMPORTANT

A 90-degree elbow must be provided in drain hole and must be removed in ductwork to comply with UL (Underwriters’ Laboratories) codes for use with electric heat.

2.6 – Make Unit Duct Connections

Unit is shipped for side duct connections. Ductwork openings are shown in Fig. 1 and Fig. 2.

Page 9