Carrier 50GS, 50GX User Manual

50GS, 50GX

Single Packaged Electric Cooling Units

Visit www.carrier.com

Installation, Start-Up, and Operating Instructions

50GS Sizes 018-060, 50GX Sizes 024-060

NOTE: Read the entire instruction manual before starting the

installation.

This symbol → indicates a change since the last issue.

TABLE OF CONTENTS

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

Introduction ....................................................................................2

RECEIVING AND INSTALLATION ..........................................2

Check Equipment......................................................................2

IDENTIFY UNIT ................................................................2

INSPECT SHIPMENT........................................................2

Provide Unit Support................................................................2

ROOF CURB.......................................................................2

SLAB MOUNT ...................................................................2

GROUND MOUNT ............................................................2

Provide Clearances....................................................................2

Field Fabricate Ductwork .........................................................2

Rig and Place Unit....................................................................2

INSPECTION ......................................................................3

INSTALLATION ................................................................3

Connect Condensate Drain .......................................................7

Install Duct Connections ..........................................................7

CONFIGURING UNITS FOR DOWNFLOW (VERTI-

CAL) DISCHARGE............................................................8

Install Electrical Connection ....................................................9

HIGH-VOLTAGE CONNECTIONS................................10

SPECIAL PROCEDURES FOR 208-V OPERATION ...10

CONTROL VOLTAGE CONNECTIONS.......................10

STANDARD CONNECTION ..........................................10

TRANSFORMER PROTECTION....................................13

PRE-START-UP ..........................................................................13

START-UP ...................................................................................14

CHECK FOR REFRIGERANT LEAKS..........................14

START UP COOLING SECTION AND MAKE ADJUST-

MENTS..............................................................................14

CHECKING COOLING CONTROL OPERATION .......14

CHECKING AND ADJUSTING REFRIGERANT

CHARGE ...........................................................................14

INDOOR AIRFLOW AND AIRFLOW ADJUST-

MENTS..............................................................................18

For 208/230V.....................................................................18

FOR 460-V GE MOTORS................................................18

COOLING SEQUENCE OF OPERATION.....................18

MAINTENANCE.........................................................................18

AIR FILTER......................................................................22

EVAPORATOR BLOWER AND MOTOR.....................22

CONDENSER COIL, EVAPORATOR COIL, AND CON-

DENSATE DRAIN PAN..................................................24

CONDENSER FAN ..........................................................24

ELECTRICAL CONTROLS AND WIRING ..................24

REFRIGERANT CIRCUIT...............................................24

EVAPORATOR AIRFLOW .............................................25

METERING DEVICE — ACUTROL DEVICE .............25

LIQUID LINE STRAINER ..............................................25

Troubleshooting............................................................................25

Start-Up Checklist........................................................................25

NOTE TO INSTALLER — Before the installation, READ THESE INSTRUCTIONS CAREFULLY AND COMPLETELY. Also, make sure the User’s Manual and Replacement Guide are left with the unit after installation.

SAFETY CONSIDERATIONS

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

Untrained personnel can perform basic maintenance functions of cleaning coils and 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 extinguisher available for all brazing operations. Consult a qualified installer or service agency for information or assistance. The qualified installer or agency must use only factory-authorized kits or accessories when modifying this product.

C99001

Fig. 1—Unit 50GS and 50GX

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

Book 1 6 Tab 6 8

PC 101 Catalog No. 535–00130 Printed in U.S.A. Form 50GS,GX-4SI Pg 1 9–03 Replaces: 50GS,GX-3SI

Before performing service or maintenance operations on system, turn off power to unit. Turn off accessory heater power switch, if applicable. Electrical shock can cause personal injury.

Recognize safety information. This is the safety-alert symbol . When you see this symbol 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 or death. WARNING signifies a hazard which could result in personal injury or death. CAUTION is used to identify unsafe practices which would 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.

These instructions cover minimum requirements and conform to existing national standards and safety codes. In some instances, these instructions exceed certain local codes and ordinances, especially those that may not have kept up with changing residential construction practices. We require these instructions as a minimum for a safe installation.

INTRODUCTION

The 50GS and 50GX units (see Fig. 1) are fully self-contained, and designed for outdoor installation. See Figs. 2 and 3 for unit dimensions. All unit sizes have discharge openings for both horizontal and downflow configurations, and are factory shipped with all downflow duct openings covered . Units may be installed either on a rooftop, ground-level cement slab, or directly on the ground if local codes permit. (See Fig. 4A for roof curb dimensions.)

RECEIVING AND INSTALLATION

Step 1—Check Equipment

IDENTIFY UNIT

The unit model number and serial number are stamped on the unit identification plate. Check this information against shipping papers.

INSPECT SHIPMENT

Inspect for shipping damage while unit is still on shipping pallet. If unit appears to be damaged or is torn loose from its anchorage, have it examined by transportation inspectors before removal. Forward claim papers directly to transportation company. Manufacturer is not responsible for any damage incurred in transit. Check all items against shipping list. Immediately notify the nearest Carrier Air Conditioning office if any item is missing. To prevent loss or damage, leave all parts in original packages until installation.

Step 2—Provide Unit Support

ROOF CURB

Install accessory roof curb in accordance with instructions shipped with curb (See Fig. 4A). Install insulation, cant strips, roofing, and flashing. Ductwork must be attached to curb.

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

Curb should be level to within 1/4 in. (See Fig. 5A). This is necessary for unit drain to function properly. Refer to accessory roof curb installation instructions for additional information as required.

SLAB MOUNT

Place the unit on a solid, level concrete pad that is a minimum of 4 in. thick with 2 in. above grade (See Fig. 5B). The slab should extend approximately 2 in. beyond the casing on all 4 sides of the unit. Do not secure the unit to the slab except when required by local codes.

GROUND MOUNT

The unit may be installed either on a slab or placed directly on the ground if local codes permit. Place the unit on level ground prepared with gravel for condensate discharge.

Step 3—Provide Clearances

The required minimum service clearances are shown in Fig.2&3. Adequate ventilation and outdoor air must be provided. The outdoor fan draws air through the outdoor coil and discharges it through the top fan grille. Be sure that the fan discharge does not recirculate to the outdoor coil. Do not locate the unit in either a corner or under an overhead obstruction. The minimum clearance under a partial overhang (such as a normal house overhang) is 36 in. above the unit top. The maximum horizontal extension of a partial overhang must not exceed 48 in. For extended overhangs, provide a minimum clearance of 48 in.

IMPORTANT: Do not restrict outdoor airflow. An air restriction at either the outdoor-air inlet or the fan discharge may be detrimental to compressor life.

Do not place the unit where water, ice, or snow from an overhang or roof will damage or flood the unit. Do not install the unit on carpeting or other combustible materials. Slab-mounted units should be at least 4 in. above the highest expected water and runoff levels. Do not use unit if it has been under water.

Step 4—Field Fabricate Ductwork

Secure all ducts to roof curb and building structure on vertical discharge units. Do not connect ductwork to unit. For horizontal applications, unit is provided with flanges on the horizontal openings. All ductwork should be secured to the flanges. 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. If a plenum return is used on a vertical unit, the return should be ducted through the roof deck to comply with applicable fire codes. A minimum clearance is not required around ductwork. Cabinet return-air static shall not exceed -.25 in. wg.

Step 5—Rig and Place Unit

Rigging and handling of this equipment can be hazardous for many reasons due to the installation location (roofs, elevated structures, etc.)

Only trained, qualified crane operators and ground support staff should handle and install this equipment.

When working with this equipment, observe precautions in the literature, on tags, stickers, and labels attached to the equipment, and any other safety precautions that might apply.

Follow all applicable safety codes. Wear safety shoes and work gloves.

Never stand beneath rigged units or lift over people.

Never exceed 200 lbs. per bracket lifting force.

REQUIRED CLEARANCE TO COMBUSTIBLE MATL.

TOP OF UNIT...................................................................................14.00 [355.6]

DUCT SIDE OF UNIT.........................................................................2.00 [50.8]

SIDE OPPOSITE DUCTS ................................................................14.00 [355.6]

BOTTOM OF UNIT.............................................................................0.50 [12.7]

ELECTRIC HEAT PANEL .................................................................36.00 [914.4]

NEC. REQUIRED CLEARANCES.

BETWEEN UNITS, POWER ENTRY SIDE ....................................42.00 [1066.8]

UNIT AND UNGROUNDED SURFACES, POWER ENTRY SIDE .36.00 [914.0] UNIT AND BLOCK OR CONCRETE WALLS AND OTHER

GROUNDED SURFACES, POWER ENTRY SIDE.........................42.00 [1066.8]

UNIT ELECTRICAL CHARACTERISTICS

INCHES [mm]

UNIT WEIGHT

lb. kg X Y Z

REQUIRED CLEARANCE FOR OPERATION AND SERVICING

EVAP. COIL ACCESS SIDE............................................................36.00 [914.0]

POWER ENTRY SIDE....................................................................42.00 [1066.8]

(EXCEPT FOR NEC REQUIREMENTS)

UNIT TOP.......................................................................................48.00 [1219.2]

SIDE OPPOSITE DUCTS ..............................................................36.00 [914.0]

DUCT PANEL .................................................................................12.00 [304.8] *

*MINIMUM DISTANCES: IF UNIT IS PLACED LESS THAN 304.8 [12.00] FROM WALL SYSTEM, THEN SYSTEM PERFORMANCE MAYBE COMPROMISE.

UNIT HEIGHT

IN. (MM)

CENTER OF GRAVITY

IN. (MM)

INCHES [mm]

”A”

50GS018 208/230-1-60 254 115.2 35.02 (889.5) 20.0 (508.0) 13.0 (330.2) 15.0 (381.0) 50GS024 208/230-1-60 260 117.9 35.02 (889.5) 19.0 (482.6) 13.0 (330.2) 15.0 (381.0) 50GS030 208/230-1-60, 208/230-3-60 258 117.0 35.02 (889.5) 19.0 (482.6) 14.0 (355.6) 15.0 (381.0) 50GS036 208/230-1-60, 208/230-3-60, 460-3-60 268 121.6 37.02 (940.3) 20.0 (508.0) 14.0 (355.6) 13.0 (330.2) 50GS042 208/230-1-60, 208/230-3-60, 460-3-60 294 133.3 35.02 (889.5) 19.0 (482.6) 14.0 (355.6) 13.0 (330.2) 50GX024 208/230-1-60 270 122.5 37.02 (940.3) 18.5 (469.9) 14.5 (368.3) 16.0 (406.4) 50GX030 208/230-1-60, 208/230-3-60 291 132.0 39.02 (991.1) 19.5 (495.3) 15.5 (393.7) 17.6 (447.0) 50GX036 208/230-1-60, 208/230-3-60, 460-3-60 299 135.6 35.02 (889.5) 19.5 (495.3) 15.25 (387.4) 16.5 (419.1)

Fig. 2— 50GS018-042 and 50GX024-036 Unit Dimensions

of wear, structural deformation, or cracks. Particular attention

Accessory lifting kit is only to be used with Small Packaged units which have a composite base pan with molded rigging holds.

INSPECTION

Prior to initial use, and at monthly intervals, all rigging brackets and straps should be visually inspected for any damage, evidence

should be paid to excessive wear at hoist hooking points and load support areas. Brackets or straps showing any kind of wear in these areas must not be used and should be discarded.

INSTALLATION

1. Position the lifting bracket assembly around the base of the unit. Leave the top shipping skid on the unit to act as a spreader bar. Be sure the strap does not twist.

C99007

REQUIRED CLEARANCE TO COMBUSTIBLE MATL.

TOP OF UNIT...................................................................................14.00 [355.6]

DUCT SIDE OF UNIT.........................................................................2.00 [50.8]

SIDE OPPOSITE DUCTS ................................................................14.00 [355.6]

BOTTOM OF UNIT.............................................................................0.50 [12.7]

ELECTRIC HEAT PANEL .................................................................36.00 [914.4]

NEC. REQUIRED CLEARANCES.

BETWEEN UNITS, POWER ENTRY SIDE ....................................42.00 [1066.8]

UNIT AND UNGROUNDED SURFACES, POWER ENTRY SIDE .36.00 [914.0] UNIT AND BLOCK OR CONCRETE WALLS AND OTHER

GROUNDED SURFACES, POWER ENTRY SIDE.........................42.00 [1066.8]

UNIT ELECTRICAL CHARACTERISTICS

INCHES [mm]

UNIT WEIGHT

lb. kg X Y Z

REQUIRED CLEARANCE FOR OPERATION AND SERVICING

EVAP. COIL ACCESS SIDE............................................................36.00 [914.0]

POWER ENTRY SIDE....................................................................36.00 [914.0]

(EXCEPT FOR NEC REQUIREMENTS)

UNIT TOP.......................................................................................48.00 [1219.2]

SIDE OPPOSITE DUCTS ..............................................................36.00 [914.0]

DUCT PANEL .................................................................................12.00 [304.8] *

*MINIMUM DISTANCES: IF UNIT IS PLACED LESS THAN 304.8 [12.00] FROM WALL SYSTEM, THEN SYSTEM PERFORMANCE MAYBE COMPROMISE.

UNIT HEIGHT

IN. (MM)

CENTER OF GRAVITY

IN. (MM)

INCHES [mm]

C99006

”A”

50GS048 208/230-1-60, 208/230-3-60, 460-3-60 324 145 38.98 (990.2) 20.0 (508.0) 17.0 (432.0) 17.0 (432.0) 50GS060 208/230-1-60, 208/230-3-60, 460-3-60 389 176 38.98 (990.2) 19.0 (482.6) 16.0 (406.0) 17.0 (432.0) 50GX042 208/230-1-60, 208/230-3-60, 460-3-60 321 146 38.98 (990.2) 20.5 (520.7) 16.75 (425.5) 16.6 (421.6) 50GX048 208/230-1-60, 208/230-3-60, 460-3-60 326 148 38.98 (990.2) 19.5 (495.3) 17.6 (447.6) 18.0 (457.2) 50GX060 208/230-1-60, 208/230-3-60, 460-3-60 399 181 42.98 (1091.1) 20.5 (520.7) 16.2 (412.8) 17.6 (447.0)

Fig. 3— 50GS048–060 and 50GX042–060 Unit Dimensions

2. Place each of the four (4) metal lifting brackets into the rigging holds in the composite pan.

3. Tighten the ratchet strap unit tight. Lifting brackets should be secure in the rigging holds.

4. Attach the clevis or hook of sufficient strength to hole in the lifting bracket (See Fig. 6).

5. Attach safety straps directly to the field supplied rigging straps or clevis clip. Do not attach the safety straps to the lifting brackets.

6. Use the top of the unit as a spreader bar to prevent the rigging straps from damaging the unit. If the wood top is not available, use a spreader bar of sufficient length to not damage the unit.

HVAC unit

Scre w

(NO TE A)

*Gask eting

outer flange

Flashing field

supplied

Roofing material

field supplied

Cant str ip

field supplied

base

Gask eting

inner flange*

Wood nailer*

Roofcurb*

Insulation (field

supplied)

Duct wo rk

field supplied

HVAC unit

Scre w

(NOTE A)

*Gask eting

outer flange

Flashing field

supplied

Roofing material

field supplied

Cant str ip

field supplied

base

Gask eting

inner flange*

Duct wo rk

field supplied

Wood nailer*

Roofcurb*

Insulation (field

supplied)

Roof

*Provided with roofcurb

Roof Curb for Small Cabinet

Note A: When unit mounting scre w is used,

retainer bra cke t must also be used.

Supply opening (B x C)

Return opening

(B X C)

/16"

B Typ.

Insulated deck pan

C Typ.

Long

Support

Short

Support

UNIT SIZE ODS CATALOG NUMBER

50GS018-042 50GX024-036

50GS048-060 50GX042-060

NOTES:

1. Dimensions in ( ) are in millimeters.

2. Roof curb is made of 16-gage steel.

3. Table lists only the dimensions per part number that have changed

4. Insulated panels: 1-in. thick fiberglass 1 lb. density.

CPRFCURB006A00 8 (203) 11(279) 16-1/2 (419) 28-3/4 (730) CPRFCURB007A00 14 (356) 11(279) 16-1/2 (419) 28-3/4 (730) CPRFCURB008A00 8 (203) 16-3/16 (411) 17-3/8 (441) 40-1/4 (1022) CPRFCURB009A00 14 (356) 16-3/16 (411) 17-3/8 (441) 40-1/4 (1022)

Fig. 4A— Roof Curb Dimensions

Roof

*Provided with roofcurb

Roof Curb for Large Cabinet

Note A: When unit mounting scre w is used,

retainer bra cket must also be used.

R/A

Gask et around

S/A

duct

Insulated deck pan

IN. (MM)

Gask et around

outer edge

IN. (MM)

C00076

IN. (MM)

→

CORNER #

1 58 60 59 62 76 69 84 76 84 85 71 78 85

2 47 50 48 50 50 45 54 49 60 60 55 56 66

3 55 56 56 58 71 88 106 57 61 64 85 80 108

4 94 94 95 98 97 122 145 88 86 90 110 112 140

TOTAL WEIGHT 254 260 258 268 294 324 389 270 291 299 321 326 399

018 024 030 036 042 048 060 024 030 036 042 048 060

50GS 50GX

C00071

Fig. 4B—50GS and 50GX Unit Corner Weights

MAXIMUM ALLOWABLE

DIFFERENCE (in.)

A-B B-C A-C

1/4 1/4 1/4

C99065

Fig. 5A—Unit Leveling Tolerances

OPTIONAL

RETURN

AIR

OPENING

EVAP. COIL COND. COIL

Fig. 5B—Slab Mounting Detail

OPTIONAL

SUPPLY

AIR

OPENING

C99096

914-137" (36"-54")

DETAIL A

SCALE 0.250

TIGHTEN STRAPPING SECURELY WITH TENSION BUCKLE

SIZE

“A”

“B”

INSTALL SAFETY STRAPS TO RIGGING CLEVIS AT 4 RIGGING BRACKETS

PLACE RIGGING BRACKET ASSEMBLY IN 4 RIGGING HOLES AND INSTALL TIE DOWN STRAP AROUND PERIMETER OF UNIT AND THROUGH

SEE DETAIL A

SPACE IN BRACKET ASSEMBLY

MAXIMUM WEIGHT A B

lb. kg in. mm. in. mm.

UNIT 50GS 018 276 125.2 20 508.0 13 330.2 024 282 127.9 19 482.6 13 330.2 030 280 127.0 19 482.6 14 355.6 036 290 131.5 20 508.0 14 355.6 042 316 143.3 19 482.6 14 355.6 048 346 156.9 20 508 17 431.8 060 411 186.4 19 482.6 16 406.4

UNIT 50GX 024 292 132.5 18.5 469.9 14.50 368.3 030 313 142.5 19.5 495.3 15.50 393.7 036 321 145.6 19.5 495.3 15.25 387.4 042 343 155.6 20.5 520.7 16.75 425.5 048 348 157.9 19.5 495.3 17.62 447.6 060 421 191.0 20.5 520.7 16.25 412.8

Fig. 6—Suggested Rigging

C99066

Lifting point should be directly over the center of gravity for the unit.

Step 6—Connect Condensate Drain

NOTE: When installing condensate drain connection be sure to

comply with local codes and restrictions.

Models 50GS and 50GX dispose of condensate water through a 3/4 in. NPT fitting which exits through the base on the evaporator coil access side. See Fig.2&3forlocation.

Condensate water can be drained directly onto the roof in rooftop installations (where permitted) or onto a gravel apron in groundlevel installations. Install a field-supplied condensate trap at end of condensate connection to ensure proper drainage. Make sure that the outlet of the trap is at least 1 in. lower than the drainpan condensate connection to prevent the pan from overflowing (See Fig. 7). When using a gravel apron, make sure it slopes away from the unit.

Connect a drain tube using a minimum of 3/4 -in. PVC or 3/4 -in. copper pipe (all field-supplied) at the outlet end of the 2-in. trap.

Do not undersize the tube. Pitch the drain tube downward at a slope of at least 1-in. for every 10 ft. of horizontal run. Be sure to check the drain tube for leaks. Prime trap at the beginning of the cooling season start-up.

Step 7—Install Duct Connections

The unit has duct flanges on the supply- and return-air openings on the side and bottom of the unit. For downshot applications the ductwork can be connected to the roof curb. See Fig.2&3for connection sizes and locations.

IMPORTANT: Use flexible connectors between ductwork and unit to prevent transmission of vibration. Use suitable gaskets to ensure weathertight and airtight seal. When electric heat is installed, use fire proof canvas (or similar heat resistant material) connector between ductwork and unit discharge connection. If flexible duct is used, insert a sheet metal sleeve inside duct. Heat resistant duct connector (or sheet metal sleeve) must extend 24-in. from the unit discharge connection flange into the ductwork.

Table 1—Physical Data—Unit 50GS

UNIT SIZE 018 024 030 036 042 048 060

NOMINAL CAPACITY (ton) 1-1/2 2 2-1/2 3 3-1/2 4 5

OPERATING WEIGHT (lb.) 254 260 258 268 294 324 389

COMPRESSOR Reciprocating Scroll Reciprocating

REFRIGERANT (R-22)

Quantity (lb.)

REFRIGERANT METERING DEVICE

* Required filter sizes shown are based on the larger of the ARI (Air Conditioning and Refrigeration Institute) rated cooling airflow or the heating airflow velocity of 300 ft./min. for throwaway type or 450 ft./min. for high-capacity type. Air filter pressure drop for non-standard filters must not exceed 0.08 in. wg.

Orifice ID (in.)

CONDENSER COIL

Rows...Fins/in.

Face Area (sq. ft.)

CONDENSER FAN

Nominal Cfm

Diameter

Motor Hp (Rpm)

EVAPORATOR COIL

Rows...Fins/in.

Face Area (sq. ft.)

EVAPORATOR BLOWER

Nominal Airflow (Cfm)

Size (in.)

Motor HP (RPM)

RETURN-AIR FILTERS (in.)*

Throwaway

2.6 3.5 3.65 4.4 6.4 5.1 7.4

Accurater

.034 .034 .034 .032 .034 .032 .030

1...17

6.1

2000

1/8 (825)

2...15

3.1

600

10x10

1/4 (825)

20x20 20x20 20x20 20x24 20x24 24x30 24x30

1...17

9.1

2400

1/8 (825)

2...15

3.1

800

10x10

1/4 (1075)

1...17

9.1

2400

1/8 (825)

2...15

3.7

1000

10x10

1/4 (1075)

1...17

10.9

3000

1/4 (1100)

3...15

3.06

1200

11x10

1/2 (1075)

1...17

9.1

3000

1/4 (1100)

4...15

3.06

1400

11x10

3/4 (1075)

1...17

12.3

3600

1/4 (1100)

3...15

4.7

1600

11x10

3/4 (1075)

2...17

3600

1/4 (1100)

4...15

2000

11x10

1.0 (1100)

12.3

4.7

Table 2—Physical Data—Unit 50GX

UNIT SIZE 024 030 036 042 048 060

NOMINAL CAPACITY (ton) 2 2-1/2 3 3-1/2 4 5

OPERATING WEIGHT (lb.) 270 291 299 321 326 399

COMPRESSOR Scroll

REFRIGERANT (R-22)

Quantity (lb.)

REFRIGERANT METERING DEVICE

Required filter sizes shown are based on the larger of the ARI (Air Conditioning and Refrigeration Institute) rated cooling airflow or the heating airflow velocity of 300

ft./min. for throwaway type or 450 ft./min. for high-capacity type. Air filter pressure drop for non-standard filters must not exceed 0.08 in. wg.

Orifice ID (in.)

CONDENSER COIL

Rows...Fins/in.

Face Area (sq. ft.) CONDENSER FAN

Nominal Cfm

Diameter (in.)

Motor Hp (Rpm)

EVAPORATOR COIL

Rows...Fins/in.

Face Area (sq. ft.)

EVAPORATOR BLOWER

Nominal Airflow (Cfm)

Size (in.)

Motor Hp (RPM)

RETURN-AIR FILTERS (in.)*

Throwaway

3.7 4.4 5.2 7.6 8.3 8.1

Accurater

.034 .030 .032 .034 .034 .032

1...17

10.8

2350

1/8 (825)

3...15

3.1

800

10x10

1/4 (1075)

20x20 20x20 20x24 20x30 24x30 24x30

1...17

12.7

2350

1/8 (825)

3...15

3.1

1000

10x10

1/4 (1075)

2...17

9.1

2350

1/8 (825)

3...15

3.7

1200

11x10

1/2 (1075)

2...17

9.1

3300

1/4 (1100)

3...15

4.7

1400

11x10

3/4 (1075)

2...17

12.3

3300

1/4 (1100)

4...15

4.7

1600

11x10

3/4 (1075)

1/4 (1100)

1.0 (1040)

2...17

16.4

3300

4...15

4.7

1750

11x10

CONFIGURING UNITS FOR DOWNFLOW (VERTICAL) DISCHARGE

Before performing service or maintenance operations on the system, turn off main power to unit and install lockout tag or electrical shock could result.

1. Open all electrical disconnects and install lockout tag before starting any service work.

2. Remove return duct cover located on duct panel by breaking four (4) connecting tabs with screwdriver and a hammer. (Fig. 8&9)

3. To remove supply duct cover, break front and right side connecting tabs with a screwdriver and a hammer. Push louver down to break rear and left side tabs. (Fig.8&9)

4. If unit ductwork is to be attached to vertical opening flanges on the unit composite base (jackstand applications only), do so at this time. Collect ALL screws that were removed. Do not leave screws on rooftop as permanent damage to the roof may

occur.

1” (25mm) MIN.

TRAP OUTLET

2” (50mm) MIN.

Fig. 7—Condensate Trap

Table 3—Minimum Airflow for Safe Electric Heater

Operation (Cfm)

SIZE 018 024 030 036 042 048 060 700 800 1000 1200 1400 1600 2000

5. It is recommended that the unit base insulation around the perimeter of the vertical return-air opening be secured to the unit base with aluminum tape. Applicable local codes may require aluminum tape to prevent exposed fiberglass.

6. Cover both horizontal duct openings with the duct covers from the accessory duct cover kit. Ensure opening is air-and watertight.

7. After completing unit conversion, perform all safety checks and power up unit.

NOTE: The design and installation of the duct system must be in accordance with the standards of the NFPA for installation of nonresidence-type air conditioning and ventilating systems, NFPA 90A or residence-type, NFPA 90B; and/or local codes and ordinances. Adhere to the following criteria when selecting, sizing, and installing the duct system:

8. Units are shipped for side shot installation.

9. Select and size ductwork, supply-air registers, and return-air grilles according to American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE) recommendations.

10. Use flexible transition between rigid ductwork and unit to prevent transmission of vibration. The transition may be screwed or bolted to duct flanges. Use suitable gaskets to ensure weathertight and airtight seal.

11. All units must have field-supplied filters or accessory filter rack installed in the return-air side of the unit. Recommended sizes for filters are shown in Tables 1 and 2.

12. Size all ductwork for maximum required airflow (either heating or cooling) for unit being installed. Avoid abrupt duct size increases or decreases or performance may be affected.

13. Adequately insulate and weatherproof all ductwork located outdoors. Insulate ducts passing through unconditioned space, and use vapor barrier in accordance with latest issue of Sheet Metal and Air Conditioning Contractors National Association (SMACNA) and Air Conditioning Contractors of America (ACCA) minimum installation standards for heating and air conditioning systems. Secure all ducts to building structure.

14. Flash, weatherproof, and vibration-isolate all openings in building structure in accordance with local codes and good building practices.

SUPPLY DUCT OPENING

Fig. 8—Supply and Return Duct Opening

Step 8—Install Electrical Connection

The unit cabinet must have an uninterrupted, unbroken electrical ground to minimize the possibility of personal injury if an electrical fault should occur. This ground may consist of an electrical wire connected to the unit ground lug in the control compartment, or conduit approved for electrical ground when installed in accordance with NEC (National Electrical Code) ANSI/NFPA (latest edition) and local electrical codes. In Canada, follow Canadian Electrical Code CSA (Canadian Standards Association) C22.1 and local electrical codes. Failure to adhere to this warning could result in personal injury or death.

RETURN DUCT OPENING

C99013

C99011

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