Carrier 50GL048300, 50GL060300, 50GL042300, 50GL030310, 50GL036300 Installation Guide

...

50GL

HEATING & COOLING

with Puron® (R-410A) Refrigerant

Single Package Electric Cooling Units

Visit www.camer.com

Installation, Start-Up, and Operating Instructions

Sizes 024-060

NOTE: Read the entire instruction manual before starting the installation.

Index Page

SAFETY CONSIDERATIONS ................................................... l

RULES FOR SAFE INSTALLATION AND OPERATION.I-4

GENERAL ................................................................................ 4

RECEIVING AND INSTALLATION .................................. 4-10

Step 1 -- Check Equipment ....................................................... 4

IDENTIFY UNIT ...................................................................... 4

INSPECT SHIPMENT ............................................................. 4

Step 2 -- Provide Unit Support ................................................. 4

ROOF CURB ............................................................................ 4

SLAB MOUNT ......................................................................... 4

GROUND LEVEL .................................................................... 4

Step 3 -- Field Fabricate Ductwork .......................................... 4

Step 4 -- Provide Clearances ..................................................... 4

Step 5 -- Rig and Place Unit ...................................................... 4

INSPECTION ............................................................................ 4

INSTALLATION .................................................................. 4-6

Step 6 -- Connect Condensate Drain ........................................ 6

Step 7 -- Install Duct Connections ........................................ 6-8

CONFIGURING UNITS FOR DOWNFLOW (VERTICAL)

DISCHARGE .............................................................................. 7-8

Step 8 -- Install Electrical Connections .............................. 8-10

HIGH-VOLTAGE CONNECTIONS .................................. 8-10

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

SPECIAL PROCEDURES FOR 208-V OPERATION ......... 10

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

TRANSFORMER PROTECTION ......................................... 10

PRE-START-UP ......................................................................... I 1

START-UP ............................................................................. 11-14

MAINTENANCE .................................................................. 15-20

TROUBLESHOOTING ............................................................. 22

START-UP CHECKLIST ......................................................... 23

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 CONSIDERA_ONS

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 p_rsonnel 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 unhrazing operations. Have fh'e extinguisher

available for all brazing operations. Consult a qualified installer or

service agency for information or assistance. The qualified in- staller or agency must use only factory-authorized kits or acces- sories when modifying this product.

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 serious injury or death.

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

RULES FOR SAFE INSTALLATION AND OPERATION

Recognize safety information. This is the safety-alert symbol z_ • When you see this symbol in instructions or manuals, be alert to

the potential for personal injury.

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

Fig. 1--Model 50GL

C99064

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

PC 101 Catalog No. 565-013 Printed io U.S.A, Form 50GL-ISI Pg 1 6-00 Replaces: New

1463]

883

i) 48]

249 6 _BSO S 249 6 [9 831 121 {7) 1983]

REARVIEW TOPVIEW

REQ'D CLEARANCES FOR OPERATION AND SERVICING. in. (ram)

Evaporator col( access side .................. 36 (914)

Power entry side (except for NEC requirements) ......... 36 (914)

Unit top .......................... 48 [1219)

Side opposite ducts ..................... 36 (914)

Duct panel ........................ 12 [304.8)*

*Minimum distances: If unit is placed less than 12 in. (304•8 ram) from wall

system, then the system performance may be compromised.

LEGEND CG - Center of Gravity

COND - Condenser EVAP - Evaporator

NEC - National Electrical Code REQ'D - Required

Note: Dimensions are in in. [rnm)

(4T.oo]

1193g

REG'D CLEARANCES TO COMBUSTIBLE MAT'L. in. (ram)

Top of unit ......................... 14 (355.6)

Duct side of unit ....................... 2 (50.8)

Side opposite ducts ..................... 14 (355.6)

Bottom of unit ....................... 0.50 [12.7)

Flue panel ......................... 36 (914.4)

NEC REQ'D CLEARANCES. in. (ram)

Between units, power entry side .............. 42 (10_6.8)

Unit and ungrounded surfaces, power entry side ......... 36 (914)

Unit and block or concrete wails and other grounded

surfaces, control box side ................. 42 (1066.8)

22 2

UNn"

50GL024 50GL030

50GL036

_LPleE,S0R BL_,R GA,,EC:I0,

FRONTVIEW

Fig. 2_0GL024-036 Unit Dimensions

ELECTRICAL CHARACTERISTICS

208/230-1-60 270 122.5

208/230-1-60, 208/230-3-60 291 132.0

20_11-_50, 208/230-3-60, 460-3-60 2g9 135.6

UNIT WEIGHT

Ib kg

uNrr HEIGHT

IN. (MM]

mA"

37,02 [940.3]

39.02 [99t .1] 35,02 [889.5]

14 81)

RIGHT 51DE VIEW

CENTER OF GRAVITY

IN. [MM]

X Y

18.5 [469.91 14.5 [368.31

19.5 [495.3] 15.5 [393.7}

19.5 [495.3] 15.3 [387.4}

C00064

16.0 1406.4]

17.6 [447.0]

16.5 [41g.11

402 _3]

•-MHHIIHJ

SUPPL+ R[TUR_

D+_[ bVCT

OPENING OPENING

I i k

[4 63]

88 3 -- {3 48i

113 831 113 _ll 113 331

- 347 3

REARVIEW

REQUIRED CLEARANCE FOR OPERATION AND SERVICING

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

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

(EXCEPT FOR NEC REQUIREMENTS)

UNIT TOP ......................................................................................... 36.00 [914.0]

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

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

*MINIMUM DISTANCES: IF UNIT IS PLACED LESS THAN 12.00 [304.8] FROM

WALL SYSTEM, THEN SYSTEM PERFORMANCE MAYBE COMPROMISE.

in. [ram]

C01L

TOP VIEW

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]

RO]-i-OM OF UNIT ............................................................................. 0.50 [12.7]

ELECTRIC HE_,T 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]

MILLIMETERS (IN.]

in. (rnm]

UNIT

50GL042 50GL048

50GL060

[5 61_

RIGHT SIDE VIEW

Fig. 3_50GL042-060 Unit Dimensions

ELECTRICAL CHARACTERISTICS IN, [MM] IN. [MM]

208/230-1_o0, 208/230-3-60. 460-3-60 321 146 38.98 [990.2] 20.5 [520.7] 16.8 [425.5] 20_-230-1,.60, 208/230-3_0, 460.-3-60 326 148 38.98 [990.2} 19.5 [495.3] 17.6 [447.6]

208F230-1-60, 208/230-3-60, 460-3-60 399 181 42.98 [1091.1] 20.5 [520.7] 16.2 [412.8]

UNIT WEIGHT UNIT HEIGHT CENTER OF GRAVITY

Ib kg "A" X Y

C00065

16.6 [421,6 I

18.0 [487.2]

17.6 [447.0]

The power supply (volts, phase, and hertz) must correspond to that specified on unit rating plate.

The electrical supply provided by the utility must be sufficient to handle load imposed by this unit.

This installation must conform with local building codes and with NEC (National Electrical Code) and NFPA 70. NFPA 54/ANSI

Z223.1 latest revision, and NFGC (National Fuel Gas Code). Refer to provincial and local plumbing or w_ste water codes and other

applicable local codes. Approved for outdoor installation on wood flooring or on class A.

B or C roof covering materials. 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 residen- tial construction practices. We require these instructions as a

minimum for a safe installation. GENERAL- The 50GL units are fully self-contained, and de-

signed for outdoor installation (See Fig. 1). See Fig. 2 and 3 for unit dimensions. All unit sizes have discharge openings for both

horizontal and downflow configurations, and are facto_ shipped with all duct openings covered. Units may be installed either on

a rooftop, ground-level cement slab, or directly on the _a'ound if local codes permit. See Fig. 4 for roof curb dimensions.

RECEIVING AND INSTALLATION

Step 1--Check Equipment

IDENTIFY UNIT--The unit model number and serial number are stamped on unit identification plate. Check this information

against shipping papers and job data. 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 fist. 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. 4 for roof curb dimen- sions). Install insulation, cant strips, roofing, and flashing. Duct-

work 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 can also result in air leaks and poor unit performance. Curb should be level to within 1/4 in. (See Fig. 6). 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. The slab

should extend 2 in. on sides of the unit. Do not secure the unit to the slab except when required by local codes.

GROUND LEVEL-- If local codes permit, the unit can be placed directly on the ground. Prepare a level gravel foundation for proper drainage.

Step 3_Field Fabricate Ductwork

Secure all ducts to roof curb and building structure on vertical discharge units. Do not connect duct_vork 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 4_Provide Clearances

The required minimum operating and service clearances are shown in Fig. 2 and 3. Adequate ventilation and condenser air must be provided.

compressor life.

The condenser fan draws air through the condenser coil and discharges it through the top fan grill. Be sure that the fan discharge does not recircalate to the condenser 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.

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, tile. or other combustible materials.

Step S--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.

INSPECTION -- Prior to initial use, and at monthly intervals, all rigging brackets and straps should be visually inspected for any damage, evidence of wear, structural deformation, or cracks. Particular attention should be paid to excessive wear at hoist booking 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. Remove unit from shipping carton. Leave top shipping skid on the unit as a spreader bar to prevent the rigging straps from

damaging the unit. If the wood skid is not available, use a spreader bar of sufficient length to protect unit from damage.

2. Position the lifting bracket assembly around the base of the

unit. Be sure the strap does not twist.

3. Place each of the 4 metal lifting brackets into the handholds in

the composite pan.

4. Thread lifting bracket strapping around bottom perimeter of unit as follows:

a. Open lever of tension buckle (ratchet type). b. Feed strapping through tension buckle (See Fig. 8).

463/16

44 5/16

END

(2)

DECK PAN (INSULATED)

SIDE PANEL--

SUPPORT RIB(S) 0.75' --{[/

SEAL STRIP (FACTORY SUPPLIED)

COUNTER FLASHING - = (FIELD SUPPLIED) •

ROOFING FELT (FIELD SUPPLIED) CANT STRIP --

(FIELD SUPPLIED)

SUPPORTA(2)

SIDE

- (2)

T BASE PAN

3.0" BOTTOM SUPPLY 4.0"

NAILER

_INSULATION

(FIELD SUPPLIED)

END VIEW

A99320

ROOFING MATERIAL

(FIELD SUPPLIED)

50GL UNIT SIZE ODS CATALOG ORDERING NO. A B C D

024-036

ROOF CURB

042-060

NOTES:

1. Roof curb must be set up for unit being installed.

2. Seal strip must be applied as required to unit being installed.

3. Dimensions in I ) are in millimeters.

4. Roof curb is made of 16 gage steel.

5. Table lists only the dirnensio_s per DOS Catalog Ordering Number that have changed.

6. Attach ductwork to curb (flanges of duct rest on curb).

7. Insulated panels: 1-in. thick fiberglass 1 Ib density,

CPRFCURB006A00 8 1203] 11-27/32 [301] 30-5/8 [T78] 28-3/4 [7301 CPRFCURB007A00 14 [356] 11-27/'32 [30t] 30-5/8 [778] 28-3/4 [730|

CPRFCURB008A00 8 [203] 15-27/32 [402] 42-1/8 [1070] 40-1/4 [1022] CPRFCURBOO£'A00 14 [356] 15-27/'32 [402] 42-1/8 [1070] 40-1/4 [1022]

IN. [MM] IN, [MM] IN. [MM] IN, [MM]

Fig. &--Roof Curb Dimensions

A99340

RETURN SUppLY

AIR AIR III

OPENING OPENING illl

/ A°OHOLO

IIII FII

I II

HOOK

_ EVAP COiL COND C_L

3____% 2--_

C99014

Fig. 5--Slab Mounting Details

DUCTS

5_AL STRIp MUST BE iN PLACE BEFORE p_ACING UNfT C_ ROOF CURB

C99015

pLACE RIGGING STRAPS IN BASEPAN SLOT (BELOW HANDHOLDS)

BEFORE RK3GING

j{48 _8")

Fig. 6_Suggested Rigging

SIZE

024 292 132.5 18.5 469,9 14.50 3683 030 313 142.5 19.5 4953 15.50 393.7 036 321 145.6 19.5 495.3 15.25 387.4 042 343 155.6 203 520.7 15,75 425.5

048 348 157.9 19,5 405.3 17.62 447.8 060 421 191.0 20.5 520.7 16.25 412.8

MAXIMUM WEIGHT A B

Ib kg in. rnm in. rnm

MAXIMUMALLOWABLE

DIFFERENCE/in.)

B A-B B-C A-C

1/4 1/4 1/4

L;9_6b

Fig. 7--Unit Leveling Tolerances

c. Pull strapping through tension buckle unit taut. d. Snap lever down 1o lock strap in tension buckle. To release

strapping, squeeze safety latch, lift lever, and pull webbing outward.

5. Tighten the tension buckle until it is taut. Lifting brackets must be secure in the handholds.

6. Attach field-supplied clevis or hook of sufficient strength to hole in the lifting bracket (See Fig. 9).

7. Attach the 2 safety straps directly to the clevis or hook at the 4 rigging brackets. DO NOT attach the safety straps to the

lifting brackeLs (See Fig. 9).

FEED _

e99087

Fig. 8_Belt Threading

CETAIL A

SCALE 025O

P_ND HOLES AND INSTALL lie DOWN STRAp

/SE E DETAIL A

AP_JN D PERIMETER OF UNIT AND THROUGH

_ACE IN BRACKET ASSEMBLY

C99066

Fig. 9---Lifting Point

8. Position lifting point directly over the unit's center of gravity.

9. Lift unit. When unit is directly over the roof curb, remove the 2 safety straps. Lower the equipment onto the roof curb.

Step 6---Connect Condensate Drain

NOTE: When installing condensate drain connection be sure to

comply with local codes and restrictions.

Model 50GL disposes of condensate water through a 3/4 in. NPT fining which exits through the base on the evaporator coil access side (See Fig. 2 and 3 for location).

Condensate water can be drained directly onto the roof in rooftop

installations (where permitted) or onto a gravel apron in ground- level 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. 10). 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 lemst one in. for every 10 fi of horizontal run. Be sure to check the drain tube for leaks. Prime trap at the beginning of the

cooling sea.son 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 ISee Pig. 2 and 3 for connection sizes and locations).

Table 1--Physical Data -- Unit 50GL

UNIT SIZE

NOMINAL CAPACITY (ton)

OPERATING WEIGHT (Ib)

COMPRESSOR

REFRIGERANT (R-410A)

Quantity (Ib)

REFRIGERANT METERING DEVICE

HIGH-PRESSURE SWITCH (psig)

LOSS-OF-CHARGE/LOW-PRESSU RE SWITCH (Liquid Line) (psig)

Cutom Reset (Auto)

RETURN-AIR FILTERS (in.)*

Throwaway

• Requiredfilter sizes shown are based on the largerofthe ARI (Air CondiUoning and RefrigerationInstitute) ratedcooling airfloworthe heatingairflowvelocity of 300 ftJminfor throwaway type or 450 ft/min for high-capacity type. Airfilter pressure drop for ncn-standardfilters must notexceed 0.08 in. wg.

Orifice ID (in.)

CONDENSER COIL

Rows...Fins/in.

Face Area (sq R)

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)

Cutout

Reset (Auto)

O24

27O

50 I ,5 I

Accurater_ Piston

.057 .057

1...17 1,.,17

10.9 12.7

2350 2350

22 22

1/8(825) 1/8 (825)

3...15 3...15 3,7 3.7

800 1000

10x10 10x10

1/4 1/4

030 036 042 048

2-1/2 3 3-1/2 4

291 299 321 326

SCrOll

00 I ,0 r g5

.065 070 ,073 .086

2...17 2,..17 2,..17 2...17

9.1 12.3 12.3 16.4

2350 2350 3300 3300

22 22 22 22

1/8 (825) 1/8 (825) 1/4 (1100) 1/4 (1100)

3..,15 3...15 4,-15 4...15

3.7 4.7 4.7 4.7

1200 1400 1600 1750

10xi0 11x10 11x10 1ix10

1/2 3#4 3/4 1

610 _+15 420+_25

20_+5

45+10

06O

399

10.0

x ,!2ox o×,12o 4xl12OX3OXl124x ox,124x OXl

1" MIN.

TRAP

oo,,E,÷

2" MIN.

C99013

Fig. 10--Condensate Trap

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 connections flanges into the ductwork.

Table 2 -- Minimum Airflow for Safe Electric Heater

Operation (Cfm)

SIZE

0,41000o 1o42 o

800 1000 1200 1400 1600 2000

CONFIGURING UNITS FOR DOWNFLOW (VERTICAL) DIS- CHARGE '

result.

1. Open all electrical disconnects before starting any service

work.

2. Remove side duct covers to access bottom return and supply knock out covers (See Fig. 12).

3. To remove supply and return duct covers, break front and right side connecting tabs with a screwdriver and a hammer. Push cover down to break rear and left side tabs.

4. If unit ductwork is to be attached to vertical opening flanges on the unit basepan (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.

5. It is recommended that the hasepan insulation around the

perimeter of the vertical return-air opening be secured to the basepan with aluminum tape. Applicable local codes may require aluminum tape to prevent exposed fiberglass.

6. Cover both horizontal duct openings with the duct covers shipped on the unit from the factory. 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. Select and size ductwork, supply-air registers, and return-air grilles according to American Society of Heating, Refrigera- tion and Air Conditioning Engineers (ASHRAE) recommen-

dations.

9. 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.

10.All unitsmusthavefield-supplied filters or accessory filter

rack installed in the return-air side of the unit. Recommended sizes for filters are shown in Table 1.

11. 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 he affected.

12. 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.

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

I-

7 i !/

SUPPLY RETURN DUCT DUCT

OPENING OPENING

Fig. 11---_upply and Return Duct Opening

VERTICALDUCT COVERS

Fig. 12--Vertical Duct Cover Removed

C99011

C99012

Step 8--Install Electrical Connections

Y:I |*?I:ITR]R [_

The unit cabinet must have an uninterrupted, unbroken elecWical 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 editionl (in Canada, Canadian Electrical Code CSA [Canadian Standards Associa- tion] C22.1) and local electrical codes. Failure to adhere to this warning could result in personal injury or death.

W_P_.TLI__d[o]Ti

Failure to follow these precautions could result in damage to the unit being installed:

1. Make all electrical connections in accordance with NEC ANSI/NFPA(Iatest edition) and local electrical codes gov-

erning such wiring. In Canada. all electrical connections

must be in accordance with CSA standard C22.1 Canadian Electrical Code Part l and applicable local codes. Refer to

unit wiring diagram.

2. Use only copper conductor for connections between

field-supplied electrical disconnect switch and unit. DO NOT USE ALUMINUM WIRE,

3. Be sure that high-voltage power to unit is within operating voltage range indicated on unit rating plate.

4. Do not damage internal components when drilling through any panel to mount electrical hardware, conduit, etc. On

3-phase units, ensure phases are balanced within 2%.

Consult local power company for correction of improper

voltage and/or phase imbalance.

HIGH-VOLTAGE CONNECTIONS- The unit must have a separate electrical service with a field-supplied, water-proof,

disconnect switch mounted at, or within sight from, the unit. Refer to the unit rating plate for maximum fuse/circuit breaker size and minimum circuit amps (ampacity) for wire sizing (See Table 3 for

electrical data). The field-supplied disconnect switch box may be mounted on the

unit over the high-voltage inlet hole when the standard power and low-voltage entry points are used (See Fig. 2 and 3 for acceptable

location). See unit wiring label and Fig. 13 for reference when making high

voltage connections. Proceed as follows to complete the high- voltage connections to the unit.

Single phase units:

1. Run the high-voltage (LI, L2) and ground leads into the control box.

2. Connect ground lead to chassis ground connection.

3. Connect LI to pressure lug connection 11 of the compressor contactor.

4. Connect L2 to pressure lug connection 23 of the compressor contactor.

Three phase units:

1. Run the high-voltage (LI, L2, L3) and ground leads into the control box.

2. Connect ground lead to chassis ground connection.

3. Locate the black and yellow wires connected to the lines side of the contactor.

+ 16 hidden pages