Carrier 50XZ060300, 50XZ048300, 50XZ042300, 50XZ036300, 50XZ030300 Installation Guide

...

Installation Instructions

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

NOTE: Installer: Make sure the Owner's Manual and Service Instructions are left with the unit after installation,

TABLE OF CONTENTS

PAGE

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

INTRODUCTION ................................... 2

RECEIVING AND INSTALLATION ................. 2-16

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

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

Inspection ...................................... 2

Installation ...................................... 2

Select and Install Ductwork ........................... 5

Converting Horizontal Discharge Units to Downflow

(Vertical) Discharge Units .......................... 7

Provide for Condensate Disposal ...................... 7

Install Electrical Connections ......................... 7

High-Voltage Connections ......................... 8

Routing Power Leads into Unit ...................... 8

Connecting Ground lead to Ground Lug ............... 8

Routing Control Power Wires (24-v) ................. 8

Easy Select _ . ................................... 9

50XZ Sequence of Operation ...................... 15

Special Procedures for 208-V Operation .............. 16

PRE-START-UP ................................... 16

START-UP ..................................... 16-19

50XZ Start-Up ................................... 16

Check for Refrigerant Leaks ......................... 17

Start-Up Adjustments ............................. 17

Check Cooling & Heating Operation ................. 17

Checking & Adjusting Refrigerant Charge ............ 18

Refrigerant Charge .............................. 18

No Charge ..................................... 18

Low Charge Cooling ............................. 18

To Use Cooling Charging Charts .................... 18

Indoor Airflow & Airflow Adjustments .............. 18

Defrost Control ................................... 19

Quiet Shift ..................................... 19

Defrost ....................................... 19

MAINTENANCE ................................ 20-25

Air Filter ........................................ 20

Indoor Blower and Motor ........................... 20

Outdoor Coil, Indoor Coil, & Condensate Drain Pan ...... 20

Outdoor Fan ..................................... 23

Electrical Controls and Wiring ....................... 23

Refrigerant Circuit ................................. 23

Turn to the Expertg

C99088

Fig. 1 - Unit 50XZ

Indoor Airflow ................................... 23

Metering Devices- TXV &AccuRater TM Piston .......... 23

Pressure Switches ................................. 24

Loss of Charge Switch ............................. 24

High Pressure Switch .............................. 24

Copeland Scroll compressor (Puron Refrigerant) ......... 24

Refrigerant System ................................ 24

Refrigerant .................................... 24

Compressor Oil ................................. 24

Servicing Systems on Roofs with Synthetic Materials .... 24

Liquid Line Filter Drier ........................... 25

Puron® (R-410A) Refrigerant Charging ............. 25

System Information ................................ 25

Loss of Charge Switch ............................ 25

Check Defrost Thermostat ......................... 25

TROUBLESHOOTING .............................. 25

START-UP CHECKLIST ............................ 25

SAFETY CONSIDERATIONS

Improper installation adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock, or other

conditions which may cause death, personal injury, or property damage. Consult a qualified installer, service agency, or your

distributor or branch for information or assistance. The qualified installer or 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 safety codes. Wear safety glasses, protective clothing,

and work gloves. Use quenching cloth for brazing operations.

Have a fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions included in

literatureandattachedto the unit. Consult local building codes, the

current editions of the National Electrical Code (NEC) NFPA 70. In Canada refer to the current editions of the Canadian electrical Code CSA C22A.

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 these signal words; DANGER, WARNING, and CAUTION. 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 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.

ELECTRICALSHOCK HAZARD Failure to follow this warning could result in personal

injury or death. Before installing or servicing system, always turn off main

power to system. There may be more than one disconnect switch. Turn off accessory heater power switch if

applicable.

FIRE, EXPLOSION, ELECTRICAL SHOCK AND CARBON MONOXIDE POISONING HAZARD

Failure to follow this warning could result in personal injury, death or property damage.

A qualified installer or agency must use only factory-authorized kits or accessories when modifying this product.

INTRODUCTION

The 50XZ heat pump is fully self-contained and designed for outdoor installation. (See Fig. 1) Standard units are shipped in a

horizontal-discharge configuration for installation on a groundlevel slab. Standard units can be converted to downflow

(vertical) discharge configurations for rooftop applications.

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 equipment distributor 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. 5). 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. (3 m) (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. (102 mm) thick with 2 in. (51 mm) above grade (See Fig. 7).

The slab should extend approximately 2 in. (51 mm) 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 and

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 48

in. (1219 mm) above the unit top. The maximum horizontal extension of a partial overhang must not exceed 48 in. (1219 mm)

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. (102 mm) above the highest expected water

and runoff levels. Do not use unit if it has been under water.

Step 4 -- 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 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. 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.

UNIT

3OXZOR4

5460

705 [878]

861

[359]

,t06 5 [16 DO]

INDOOR

OUTDOOR COIL

53XZO30 50XZO38

CORNER WEIGHT LBS/HG

III .... 2 .... 3 .... 4.

024 581263 34/243 731341 133/604

030 89/313 37/259 86/390 1481672

036 83/377 62/281 96/436 162/735

ELECTRICAL

CHARACTERISTICS

208 230 I 60 2031230 I 60, 2031230 3 60 208/230 I 60, 2031230 3 60

UNIT WT UNIT HEIGHT

LBS KG IIAII

320 1451 940313702] 360 1633 991113902] 403 1828 1041R[4102]

REO_RED CLEARANCES TO COMBUSTIBLE MATL.

TOP OF UNIT ............................. 355 6 [1400]

DUCT SIDE OF UNIT ............................ 508 [2 00]

SIDE OPPOSITE DUSTS ........................ 355 6 [14 O0]

BOTTOM OF UNIT ................................... 127 [OBO]

ELECTRIC HEAT PANEL ................................ 9144 [3600]

NEC. REQUIRED CLEARANCES

BETWEEN UNITS, POWER ENTRY SIDE ................. I066 8 [42 00]

UNIT AND UNGROUNDED SURFACES, POWER ENTRY SIDE ........ 9140 [3600]

UNIT AND BLOCK OR CONCRETE WALLS AND OTHER

GROUNDED SURFACES, POWER ENTRY SIDE .................. 10668 [4200]

REG_RED CLEARANCE FOR OPERATION AND SERVICING

EVAP COIL ACCESS SIDE ..................... 91_0 [36 OO]

POWER ENTRY SIDE ............................ 91_0 [3600]

(EXCEPT FOR NEC REQUIREMENTS)

UNIT TOP ........................................... 91_0 [3600]

SIDE OPPOSITE DUCTS .................................... 9140 [3600]

DUCT PANEL.............................................. 3048 [12DO]+

_MINIMUM DISTANCES:IF UNIT IS PLACED LESS THAN 3048 [1200] FROM WALL

SYSTEM,THEN SYSTEM PERFORMANCE MAYBE COMPROMISED

CENTER OF GRAVITY MMIIN

5588[220] 3874[153] 4470[176] 50801200] 3556[140] 4470[176]

Y Z

3683[145] 4064[160]

MILLIMETERS [IN]

DIMENSIONS IN [] ARE IN INCHES

TOP VIEW

_7985

[31 44]

FIELD ENTRY_

SERVICE PORTS I

11939

[4700]

_°

LEFT SIDE VIEW

FULL LOUVER

8310

[3272]

[1285]

5703

[2245]

427 [I 68]

[285]

o, FULL LOUVER

, /

n m _

_COMPRESSOR, BLOWER, ELECTRIC HEAT

& ELECTRICAL ACCESS PANEL

FRONTVIEW

12263 [4828]

,_FULL LOUVER

[088] DIA HOLE

222 CONTROL ENTRY_

Z 2762 X

[1087] 13

[530]

871 _

[343]

_BO

5 [I 75] DIA KO

POWER ENTRY

1222

[481]

[O2O]

4020

[1583]

88 3 _

[3 48]

_ii _'-_-_ .... _ •° mm_ FULL_O_LOUVER

SUPPLY

• DUCT

OPENING

117 !

[463]

PaR6 2496 [983] [985]

_5505

[2167]

RETURN DUCT OPENING

RIGHTSIDEVIEW REARVIEW

3DXZBDO22R/%

UNIT

50XZO42

50XZO48 SOXZO6O

CORNER WEIGHT LBS/KG

III .... 2 .... 3 .... 411

042 961436 591268 124/563 175/795

[16 01]

INDOOR COIL

[_ /

OUTDOOR COIL _VI

Q D

048 1021463 651295 131/595 1811822

000 107/486 70/318 136/617 186/844

ELECTRICAL

CHARACTERISTICS

208 230 I 60, 208/230 3 60 208 230 I 60, 208/230 3 60 208 230 I 60, 208/230 3 60

REQUIRED CLEARANCES TO COMBUSTIBLE MATL.

TOP OF UNIT ........................................ 3556 [1400]

DUCT SIDE OF UNIT .............................. 508 [200]

SIDE OPPOSITE DUCTS ....................... 355 6 [14 003

BOTTOM OF UNIT ........................... 127 [0 50]

ELECTRIC HEAT _ANEL ..................................... 9144 [3600]

NEC. REQUIRED CLEARANCES.

BETWEEN UNITS, POWER ENTRY SIDE ....................... 10658 [4200]

UNIT AND UNGROUNDED SURFACES, POWER ENTRY SIDE ........ 9140 [3600]

UNIT AND _LOCK OR CONCRETE WALLS AND OTHER

GROUNDED SURFACES, POWER ENTRY SIDE ........... 10668 [4200]

REQUIRED CLEARANCE FOR OPERATION AND SERVICING

EVAP COIL ACCESS SIDE .................................. 9140 [3600]

°OWER ENTRY SlOE ........................................ 9140 [3000]

(EXCEPT FOR NEC REQUIREMENTS)

UNIT TOP.................................. 9140 [3600]

SIDE OPPOSITE DUCTS ...................... 9140 [3600]

DUCT PANEL ............................ 3048 [1200]_

_MINIMUM DISTANCES:IF UNIT IS PLACED LESS THAN 3048 [1200] FROM WALL

UNIT WT UNIT HEIGHT CENTER OF GRAVITv MM/IN

LBS HG "A" Y Z

4Sa 206 10917[4298] 4476[176] _572[180] 479 217 11425[4_983 4953[1953 4476[1763 4572[1803 499 226 1193 3[4698] 5334[21 O] 5080[20 O] 4_20[17,6]

MILLIMETERS [IN]

SYSTEM,THEN SYSTEM PERFORMANCE MAYBE COMPROMISED

DIMENSIONS IN [] ARE IN INCHES

TOP VIEW

11939

10906

[4294]

SERVICE FORTS i

FIELD ENTRY_

230

I E091]

[4700]

FULL LOUVER

_°

75] DIA HO

445 [I POWER ENTRY_

5292

o> 2 2

427 •

[168] DRAIN OUTLET

190 [075] NPT

X 220 [088] DP [1295]

11231 [4422]

LEFT SIDE VIEW

:2442]

_x I

COMPRESSOR, BLOWER, ELECTRIC HEAT

& ELECTRICAL ACCESS PANEL

12263 [4828]

FRONT VIEW

T t

326 I [1284]

869

[481]

[342] IR20

FULL LOUVER

[088] OlA HOLE

CONTROL ENTRY

RIGHT SIDE VIEW

_4 I

[0 16]

402 0

[15 83]

1177

[4 63]

.,_j FULL LOUVER m

SUPPLY RETURN DUCT • DUCT .

OPENING

.___J__ I 1 --4.

_872 _3413

[343] E1367]

_3512 _ _B51 2 '_

[1383] [1383]

REAR VIEW

50XZSOO183

[ D

rev

Unit

Rigging

Weight

1 2

RIGGING WEIGHTS (SMALL CABINET)

024 030 036

Ib kg Ib kg Ib kg Unit

331 150 371 168 414 188 RiggingWeight

Fig. 4 - Rigging Weights

C00071

RIGGING WEIGHTS (LARGE CABINET)

042 048 060

3. Place each of the 4 metal lifting brackets into the rigging

holds in the composite unit base.

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 as shown in Fig.

c. Pull strapping through tension buckle unit taut.

d. Snap lever down to 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 rigging holds.

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 brackets (See Fig. 9).

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.

10. After the unit is placed on the roof curb or mounting pad, remove the top crating. On 50XZ060 units only, 2 wire ties

fastened to the outdoor coils and reversing valve/accumulator assembly must be cut. Remove the left

and front louver panels and corner post to access wire ties. The wire tie to be cut on the left is located approximately 4 in. (102 mm) down the tube sheet. The wire tie to be cut on

the right is located approximately 6 in. (152 mm) down the tube sheet.

Step 5 -- Select and Install Ductwork

The design and installation of the duct system must be in accordance with the standards of the NFPA for installation of

non-residence type air conditioning and ventilating systems, NFPA 90A or residence-type, NFPA 90B and/or local codes and

ordinances.

Select and size ductwork, supply-air registers, and return air grilles

according to ASHRAE (American Society of Heating, Refrigeration, and Air Conditioning Engineers) recommendations. The unit has duct flanges on the supply- and return-air openings

on the side of the unit. When designing and installing ductwork, consider the following:

PERSONAL INJURY HAZARD Failure to follow this warning could result in personal

injury or death.

For vertical supply and return units, tools or parts could drop into ductwork Install a 90 degree turn in the return

ductwork between the unit and the conditioned space. If a 90 degree elbow cannot be installed, then a grille of sufficient strength and density should be installed to prevent objects from falling into the conditioned space. Units with electric heaters require 90 degree elbow in supply duct.

1. All units should have field-supplied filters or accessory filter rack installed in the return-air side of the unit.

Recommended sizes for filters are shown in Table 1.

2. Avoid abrupt duct size increases and reductions. Abrupt change in duct size adversely affects air performance.

IMPORTANT: Use flexible connectors between ductwork and unit to prevent transmission of vibration. Use suitable gaskets to

ensure weather tight and airtight seal. When electric heat is installed, use fireproof 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.

(610 mm) from electric heater element.

3. Size ductwork for cooling air quantity (cfm). The minimum air quantity for proper electric heater operation is listed in

Table 2. Heater limit switches may trip at air quantities

below those recommended.

field supplied

/ base

/ ,,,_crew'_._

/ (NOTEA) _

/ *Gasketin;...__

I Flashing field II1_11t

I supplied _ _n_il_ Roofcurb*

II_i;llltJ Insulation(field

Roofing matei'at II ii l" supplied)

_, /l_!i:llll _ Duct we rk j

\ c__tllt field supplied /

Roof Curb for Small Cabinet

Note A:When unit mounting screw is used

retainer bracket must also be used.

Supply opening

(BxC)

Roof Curb for Large Cabinet

Note A:When unit mounting screw is used

retainer bracket must also be used.

R/A

_ Gasket around \.

Insulated Gasket around

deck pan outer edge \

ODS CATALOG

UNIT SIZE IN. (MM) IN. (MM) IN. (MM)

50XZ024-036 14 (356) 11 (279) 16-1/2 (419)

50XZ042-060 8 (203) 16-3/16 (411 ) 17-3/8 (441)

NOTES:

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

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

5. Roof curb is made of 16-gauge steel,

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

7. Insulated panels: 1-in. (25 mm) thick fiberglass 1 Ib (.45 kg) density. 8, When unit mounting screw is used (see Note A), a retainer bracket must

be used as well. This bracket must also be used when required by code for hurricane or seismic conditions. This bracket is available through Micrometl.

NUMBER CPRFCURB006A00 CPRFCURB007A00

CPRFCURB008A00 CPRFCURB009A00

A B C

8 (203) 11 (279) 16-1/2 (419)

14 (356) 16-3/16 (411) 17-3/8 (441)

Fig. 5 - Roof Curb Dimensions

duct

S/A

/ \

C00076

IN. (MM)

28-3/4 (730) 28-3/4 (730)

40-1/4 (1022) 40-1/4 (1022)

A-B

1/4 (6.35)

Fig. 6 - Unit Leveling Tolerances

ill_RETURN

AIR

MAXIMUM ALLOWABLE

DIFFERENCE in. (mm)

B-C ArC

1/4 (6.35) 1/4 (6.35)

A07925

IIIIIOPEN'NGt

IIIII /' IIII| [[[

III1! I_l

IIIII....

IIIII \ IIIII

IIIII IIII

(50.8ram)

EVAR COIL COND. COIL

A07926

Fig. 7 - Slab Mounting Detail

FEED

C99067

Fig. 8 - Threading Belt

4. Seal, insulate, and weatherproof all external ductwork. Seal, insulate and cover with avapor barrier all ductwork passing

through conditioned spaces. Follow latest Sheet Metal and Air Conditioning Contractors National Association

(SMACNA) and Air Conditioning Contractors Association (ACCA) minimum installation standards for residential heating and air conditioning systems.

5. Secure all ducts to building structure. Flash, weatherproof, and vibration-isolate duct openings in wall or roof according to good construction practices.

CONVERTING HORIZONTAL DISCHARGE UNITS TO DOWNFLOW (VERTICAL) DISCHARGE UNITS

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal iniury or death.

Before installing or servicing system, always turn off main power to system. There may be more than one disconnect

switch.

1. Open all electrical disconnects before starting any servace work.

2. Remove horizontal duct covers to access bottom return and

supply knock out panels.

3. Use a screwdriver and hammer to remove the panels in the bottom of the unit base.

NOTE: These panels are held in place with tabs similar to an electrical knockout.

4. Reinstall the horizontal duct covers (Fig. 11) to block off

the horizontal air openings.

NOTE: Avoid abrupt duct size increases and reductions. Abrupt change in duct size adversely affects air performance.

Step 6 -- Provide for Condensate Disposal

NOTE: Ensure that condensate-water disposal methods comply

with local codes, restrictions, and practices. The 50XZ units dispose of condensate through a 3/4 in. NPT

female fitting that exits on the compressor end of the unit.

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. (25 mm) lower than the drain-pan condensate connection to prevent the pan from overflowing. Prime the trap with water. When using a gravel apron,

make sure it slopes away from the unit. If the installation requires draining the condensate water away from

the unit, install a field-supplied 2 -in. trap at the condensate connection to ensure proper drainage. Condensate trap is available

as an accessory or is field-supplied. Make sure that the outlet of the

trap is at least 1 in. (25 mm) lower than the unit drain-pan condensate connection to prevent the pan from overflowing.

Connect a drain trough using a minimum of field-supplied 3/4-in.

PVC or field-supplied 3/4-in. copper pipe at outlet end of the 2-in. (51 mm) trap. (See Fig. 12) Do not undersize the tube. Pitch the drain trough downward at a slope of at least 1 in. (25 mm)

every 10 ft (3 m) of horizontal run. Be sure to check the drain trough for leaks. Prime the trap at the beginning of the cooling

season start-up.

Step 7 -- Install Electrical Connections

UNIT COMPONENT DAMAGE HAZARD

Failure to follow this caution could result in damage to the unit being installed.

1. Make all electrical connections in accordance with NEC ANSI/NFPA 70 (latest edition) and local electrical codes

governing such wiring. In Canada, all electrical connections must be in accordance with CSA standard

C22.1 Canadian Electrical Code Part 1 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. On

3-phase units, ensure phases are balanced within 2 percent. Consult local power company for correction of improper voltage and/or phase imbalance.

4. Insulate low-voltage wires for highest voltage contained within conduit when low-voltage control wires are in

same conduit as high-voltage wires.

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

etc.

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

SEE DETAIL A

U NIT 50XZ A B

024 19.0 18.25 463.6 030 19.0 18.25 463.6

036 20.0 19.0 482.6 042 20.0 2t .25 539.8

048 20.0 2t .25 539.8 060 2t .0 20.0 508.0

in, in, mm

SPACE IN BRACKET ASSEMBLY

Fig. 9 - Suggested Rigging

ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury

or death. The unit cabinet must have an uninterrupted, unbroken

electrical ground. This ground may consist of an electrical wire connected to the unit ground screw in the control compartment, or conduit approved for electrical ground when installed in accordance with NEC, ANSI/NFPA 70 American

National Standards Institute/National Fire Protection Association (latest edition) (in Canada, Canadian Electrical

Code CSA C22.1) and local electrical codes.

HIGH-VOLTAGE CONNECTIONS

The unit must have a separate electrical service with a field-supplied, waterproof disconnect switch mounted at, or within

sight from the unit. Refer to the unit rating plate, NEC and local codes for maximum fuse/circuit breaker size and minimum circuit

amps (ampacity) for wire sizing. The field-supplied disconnect may be mounted on the unit over

the high-voltage inlet hole (See Fig. 2 and 3). If the unit has an electric heater, a second disconnect may be

required. Consult the Installation, Start-Up, and Service Instructions provided with the accessory for electrical service

connections. Operation of unit on improper line voltage constitutes abuse and

may cause unit damage that could affect warranty.

DETAIL A

SCALE 0.250

TIGHTEN STRAPPING SECURELY WITH TENSION BUCKLE

INSTALL SAFETY STRAPS TO RIGGING CLEVIS AT 4 RIGGING BRACKETS

482.6

508.0

533.4

ROUTING POWER LEADS INTO UNIT Use only copper wire between disconnect and unit. The

highvoltage leads should be in a conduit until they enter the duct panel; conduit termination at the duct panel must be watertight.

Run the high-voltage leads through the power entry knockout on the power entry side panel. (See Fig. 2 and 3 for location and size)

When the leads are inside the unit, run leads up the high-voltage raceway to the line wiring splice box (See Fig. 13 through 17). For

singlephase units, connect leads to the black and yellow wires; for 3-phase units, connect the leads to the black, yellow, and blue

wires.

CONNECTING GROUND LEAD TO GROUND LUG

Refer to Fig. 15 and 16. Connect the ground lead to the chassis using the ground lug in the wiring splice box.

ROUTING CONTROL POWER WIRES (24-V) Form a drip-loop with the thermostat leads before routing them

into the unit. Route the thermostat leads through grommeted, low-voltage hole provided in unit into unit control power splice box. (See Fig. 2 and 3) Connect thermostat leads to unit control

power leads as shown in Fig. 15. The unit transformer supplies 24-v power for complete system

including accessory electrical heater. An automatic-reset circuit breaker (See Fig. 17) is provided in the 24-v circuit; see the caution label on the transformer or Fig. 18. Transformer is factory

wired for 230-v operation. If supply voltage is 208-v, rewire transformer primary as described in Special Procedures for 208-v

Operation section.

C99075

Table I - Physical Data - Unit 50XZ

UNIT SIZE

NOMINAL CAPACITY (ton)

SHIPPING WEIGHT (Ib)

(kg)

COMPRESSOR QUANTITY

TYPE

REFRIGERANT

REFRIGERANT METERING DEVICE

Refrigerant (R-410A) Quantity (Ib)

METERING DEVICE ID

(kg)

ORIFICE OD (in.) QTY

(mm)

Rows... Fins/in. 2...21 2...21 2...21 2...21 2...21 2...21

face area (sq. ft.) 12.3 12.0 13.6 15.4 17.4 19.3

OUTDOOR FAN

Nominal Airflow (CFM) 2700 2700 2800 2800 3300 3300

Diameter (in.) 22 22 22 22 22 22

OUTDOOR COIL l

(mm) 559 559 559 559 559 559

Motor HP (RPM) 1/8 (825) 1/8 (825) 1/8 (825) 1/8 (825) 1/4 (1100) 1/4 (1100)

INDOOR COIL

Rows... Fins/in. 3...15 3...15 4...15 3...15 4...15 4...15

face area (sq. ft.) 3.7 3.7 3.7 4.7 4.7 5.7

INDOOR BLOWER

Nominal Airflow (CFM) 800 1000 11 O0 1400 1450 1750

Size (in.) 10x10 10x10 1lx10 1 lx10 1lx10 1lx10

(mm) 254x254 254x254 279x254 279x254 279x254 279x254

Motor (H P) 1/2 1/2 3/4 3/4 3/4 1.0

HIGH- PRESSURE SWITCH (psig) 650_+15

LOSS- OF- CHARGE/LOW- PRESSURE

RETURN-AIR FILTERS throwaway* (in.) 20x20x1 20x24x1 24x30x1

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

UNIT-5OXZ 024 030 036 042 048 060

AIRFLOW 750 1025 1250 1400 1710 1800

Cutout

Reset (Auto) 420_+25

SWITCH 20_+5

(Liquid Line) (psig) 45_+10

Cutout

Reset (Auto)

(mm) 508x508x25 508x610x25 610x762x25

Table 2 - Minimum Airflow for Reliable Electric Heater Operation (Cfm)

50XZ024 50XZ030 50XZ036 50XZ042 50XZ048 50XZ080

2 2.5 3 3.5 4 5

388 408 451 508 531 551

167 185 205 230 241 250

SCROLL COMPRESSOR

7.5

3.4

TXV

0.035 (2)

(.89)

8.2

3.7

TXV

0.035 (2)

(.89)

Indoor-TXV Outdoor-Accurater

9.7

4.4

TXV

0.038 (2)

(.97)

R- 410A

0.038 (2)

11.0

5.0

TXV

(.97)

11.5

5.2

TXV

0.038 (Left OD Coil)

0.046 (Right OD Coil)

(.97 Left OD

Coil)

(1.17 Right OD

Coil)

13.5

6.1

TXV

0.042 (Left OD Coil)

0.052 (Right OD Coil)

(1.07 Left OD

Coil)

(1.32 Right OD

Coil)

EASY SELECT TM - 50XZ EASY SELECT CONFIGURATION TAPS FOR 50XZ

Easy Select taps are used by the installer to configure a system. The ECM motor uses the selected taps to modify its operation to a

pre-programmed table of airflows. The unit must be configured to operate properly with system components with which it is installed.

To successfully configure a basic system (see information printed on circuit board label located next to select pins), move the 6 select

wires to the pins which match the components used.

a. AUX HEAT kW/CFM-SELECT HEATER RANGE

FOR SIZE OF ELECTRIC HEATER INSTALLED Installer must select the auxiliary heat airflow approved

for application with kW size heater installed. If no heater is installed, this step can be skipped. Each select

pin is marked with a range of heaters for which airflow

(also marked), is approved. For increased comfort, select the narrowest kW range matching the heater size, for

example, 0-10 for 10-kW heater. This airflow must be greater than the minimum for CFM for electric heater

application with the size system installed for safe and

continuous operation. (See Tables 3, 4, 5, 6 & 7 for

airflow delivery and n_ininmm CFM.) Note that airflow

marked is the airflow which will be supplied in emergency heat mode and heating mode on air

conditioners when electric heat is the primary heating source. In heat pump heating mode when electric

heaters are energized, the ECM will run the higher of heat pump heating airflow and electric heater airflow to

ensure safe heater operation. The factory selection is the largest heater range approved (See Fig. 19, A as

indicated).

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