Carrier 48EZ-A User Manual

48EZ(N) ---A Comfortt 13 SEER Single ---Packaged HYBRID HEAT® Dual Fuel System with Puronr (R ---410A) Refrigerant Single And Three Phase 2 --- 5 N o m i n a l To n s ( S i z e s 2 4 --- 6 0 )

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--2.......................

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

RECEIVING AND INSTALLATION 2--13.................

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

Identify Unit 2....................................

Inspect Shipment 2.................................

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

Roof Curb 2......................................

Slab Mount 2.....................................

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

Provide Clearances 6.................................

Rig and Place Unit 6.................................

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

Install Flue Hood 7...................................

Install Gas Piping 7..................................

Install Duct Connections 11............................

Configuring Units for Downflow (Vertical)

Discharge 11.....................................

Install Electrical Connections 13........................

High--Voltage Connections 13........................

Special Procedures for 208--V Operation 13..............

Control Voltage Connections 13.......................

Balance Point Setting Thermidistat or Hybrid Heat

Thermostat 13....................................

Transformer Protection 13...........................

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

START--UP 15--18.....................................

Check for Refrigerant Leaks 15.........................

Unit Sequence of Operation 15.........................

Start--Up Heating and Make Adjustments 15...............

Checking Heating Control 16.........................

Check Gas Input 16................................

Adjust Gas Input 16................................

Check Burner Flame 17.............................

Start--Up Cooling and Make Adjustments 18...............

Checking Cooling Control Operation 18................

Checking and Adjusting Refrigerant 18.................

Indoor Airflow and Airflow Adjustments 18.............

MAINTENANCE 28--34................................

Air Filter 28........................................

Indoor Blower and Motor 28...........................

Flue Gas Passageways 29..............................

Limit Switch 29.....................................

Burner Ignition 29...................................

Main Burners 29....................................

Outdoor Coil, Indoor Coil, & Condensate Drain Pan 29......

Outdoor Fan 30.....................................

Electrical Controls and Wiring 30.......................

Refrigerant Circuit 30.................................

Gas Input 31........................................

Indoor Airflow 31...................................

Check Defrost Thermostat 31...........................

PuronR Items 31....................................

TROUBLESHOOTING 34..............................

START--UP CHECKLIST 34............................

Installation and servicing of this equipment can be hazardous due to mechanical and electrical components. Only trained and qualified personnel should install, repair, or service this equipment.

Untrained personnel can perform basic maintenance functions such as cleaning and replacing air filters. All other operations must be performed by trained service personnel. When working on this equipment, observe precautions in the literature, on tags, and on labels attached to or shipped with the unit and other safety precautions that may apply.

Follow all safety codes. Wear safety glasses, protective clothing, and work gloves. Have fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions included in literature and attached to the unit. Consult local building codes, the current editions of the National Fuel Gas Code (NFGC) NFPA 54/ANSI Z223.1, and the National Electrical Code (NEC) NFPA 70.

In Canada refer to the current editions of the National Standards of Canada CAN/CSA--B149.1 and .2 Natural Gas and Propane Installation codes, and Canadian Electrical Code CSA C22.1.

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

A09034

Fig. 1 -- Unit 48EZ--A

SAFETY CONSIDERATIONS

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.

WARNING

ELECTRICAL SHOCK 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 and install lockout tag. There may be more than one disconnect switch. Turn off accessory heater power switch if applicable.

WARNING

FIRE, EXPLOSION, ELECTRICAL SHOCK AND

48EZ --A

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.

CAUTION

CUT HAZARD

Failure to follow this caution may result in personal injury. When removing access panels (see Fig. 19) or performing

maintenance functions inside your unit, be aware of sharp sheet metal parts and screws. Although special care is taken to reduce sharp edges to a minimum, be extremely careful when handling parts or reaching into the unit.

Manufacturer is not responsible for any damage incurred in transit. Check all items against shipping list. Immediately notify the nearest equipment distribution office if any item is missing. To prevent loss or damage, leave all parts in original packages until installation.

If the unit is to be mounted on a curb in a downflow application, review Step 9 to determine which method is to be used to remove the downflow panels before rigging and lifting into place. The panel removal process may require the unit to be on the ground.

Step 2 — Provide Unit Support

For hurricane tie downs, contact distributor for details and PE (Professional Engineering) Certificate if required.

ROOF CURB Install accessory roof curb in accordance with instructions shipped

with curb (See Fig. 4). 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 water tight 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. (6 mm). This is necessary for unit drain to function properly. Refer to accessory roof curb installation instructions for additional information as required.

Installation on older “G” seriesroof curbs.

Two accessory kits are available to aid in installing a new “G” series unit on an old “G” roof curb.

1. Accessory kit number CPADCURB001A00, (small chassis) and accessory kit number CPADCURB002A00, (large chassis) includes roof curb adapter and gaskets for the perimeter seal and duct openings. No additional modifications to the curb are required when using this kit.

2. An alternative to the adapter curb is to modify the existing curb by removing the outer horizontal flange and use accessory kit number CPGSKTKIT001A00 which includes spacer blocks (for easy alignment to existing curb) and gaskets for the perimeter seal and duct openings. This kit is used when existing curb is modified by removing outer horizontal flange.

INTRODUCTION

The 48EZ--A unit (see Fig. 1) is a fully self--contained, combination Category I gas heating/electric heating and cooling unit designed for outdoor installation (See Fig. 2 and 3 for unit dimensions). All unit sizes have return and 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, or on a cement slab (See Fig. 4 for roof curb dimensions).

Models with an N in the fifth position of the model number are dedicated Low NOx units designed for California installations. These models meet the California maximum oxides of nitrogen (NOx) emissions requirements of 40 nanograms/joule or less as shipped from the factory and must be installed in California Air Quality Management Districts or any other regions in North America where a Low NOx rule exists.

RECEIVING AND INSTALLATION

Step 1 — Check Equipment

IDENTIFY UNIT The unit model number and serial number are stamped on the unit

information plate. Check this information against shipping papers. INSPECT SHIPMENT Inspect for shipping damage before removing packaging materials.

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.

UNIT/STRUCTURAL DAMAGE HAZARD

Failure to follow this caution may result in property damage. Ensure there issufficient clearance for saw blade when cutting

the outer horizontal flange of the roof curb so there is no damage to the roof or flashing.

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. The slab should be flush on the compressor end of the unit (to allow condensate drain installation) and should extend 2 in. (51 mm) on the three remaining sides of the unit. Do not secure the unit to the slab except when required by local codes.

CAUTION

Step 3 — 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.

48EZ --A

Fig. 2 -- 48EZ--A24--36 Unit Dimensions

A09450

48EZ --A

Fig. 3 -- 48EZ--A42--60 Unit Dimensions

A09451

HVAC unit base rails

Anchor screw

Flashing field supplied

Roofing material field supplied

Cant strip field supplied

HVAC unit basepan

Sealing Gasket

Roofcurb

Wood nailer*

Roofcurb*

Insulation (field supplied)

*Provided with roofcurb

ROOF CURB DETAIL

SMALL CURB

A09090

A09418

48EZ --A

LARGE CURB

UNIT SIZE

Small

Large

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

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

5. Insulated panels: 1--in. (25.4 mm) thick fiberglass 1 lb. density.

CATALOG

NUMBER

CPRFCURB010A00 11 (279) CPRFCURB011A00 14 (356) CPRFCURB012A00 11 (279) CPRFCURB013A00 14 (356)

IMPORTANT: Do not install large base pan HYBRID HEAT units onto the small base pan (common curb). The center of gravity on a large base pan HYBRID HEAT unit could overhang the curb causing an unsafe condition. Before installing any large base pan unit onto the common curb, check the “Y” distance in the product

IN. (mm)BIN. (mm)*

10 (254)

14 (356)

Fig. 4 -- Roof Curb Dimensions

A09415

A09419

IN. (mm)DIN. (mm)EIN. (mm)FIN. (mm)GIN. (mm)HIN. (mm)

16 (406)

47.8

(1214)

32.4 (822)

43.9

(1116)

2.7 (69)

30.6 (778)

46.1 (1170)

42.2 (1072)

literature dimensional drawing to ensure that “Y” is greater than 14 in. (356 mm). Do not install any large base pan unit onto the common curb with a “Y” dimension (center of gravity) less than 14 in. (356 mm).

CAUTION - NOTICE TO RIGGERS PRUDENCE - AVIS AUX MANIPULATEUR

PANNEAUX D'ACCES DOIT ÊTRE EN PLACE POUR MANIPULATION.

Use top skid as spreader bar. / Utiliser la palette du haut comme barre de répartition

ACCESS PANELS MUST BE IN PLACE WHEN RIGGING.

DUCTS

MINIMUM HEIGHT: 36" (914.4 mm) HAUTEUR MINIMUM

48EZ --A

SEE DETAIL A VOIR DÉTAIL A

RIGGING WEIGHTS (SMALL CABINET) RIGGING WEIGHTS (LARGE CABINET)

Unit

Rigging

Weight

*For 460 Volt units add 14 lb (6.35 kg) to the rigging weight. NOTE: See dimensional drawing for corner weights.

24 30 36

lb kg lb kg lb kg lb kg lb kg lb kg

359 163 373 169 379 172

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.

See unit rating plate for any required clearances around ductwork. Cabinet return--air static shall not exceed --.25 IN. W.C.

Step 4 — Provide Clearances

The required minimum operating and service clearances are shown in Fig. 2 and 3.

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.

The condenser fan pulls air through the condenser coil and discharges it through the top grille. Be sure that the fan discharge does not recirculate 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 48--in. (1219 mm) above the unit top. The maximum horizontal extension of a partial overhang must not exceed 48--in. (1219 mm).

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. The unit may be installed on Class A, B, or C roof covering materials. Slab mounted units should be at least 4--in. (102 mm) above thehighest expected water and runoff levels. Do not use unit if it has been under water.

UNIT HEIGHT HAUTEUR D'UNITÉ

DETAIL A

VOIR DÉTAIL A

Unit

Rigging

Weight

42 48 60

461 209 482 219 507 230

Fig. 5 -- 48EZ--A Suggested Rigging

Step 5 — Rig and Place Unit

PERSONAL INJURY OR PROPERTY DAMAGE HAZARD

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

When installing the unit on a rooftop, be sure the roof will support the additional weight.

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.

Training for operators of the lifting equipment should include, but not be limited to, the following:

1. Application of the lifter to the load, and adjustment of the lifts to adapt to various sizes or kinds of loads.

2. Instruction in any special operation or precaution.

3. Condition of the load as it relates to operation of the lifting kit, such as balance, temperature, etc.

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

SEAL STRIP MUST BE IN PLACE BEFORE PLACING UNIT ON ROOF CURB

BANDE SCELLANT DOIT ÊTRE EN PLACE AVANT DE PLACER L'UNITÉ SUR LA BASE DE TOIT

50CY502286 2.0

WARNING

A09051

Inspection

Prior to initial use, and at monthly intervals, all rigging shackles, clevis pins, 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. Materials showing any kind of wear in these areas must not be used and should be discarded.

WARNING

UNIT FALLING HAZARD

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

Never stand beneath rigged units or lift over people.

WARNING

PROPERTY DAMAGE HAZARD

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

When straps are taut, the clevis should be a minimum of 36 in. (914 mm) above the unit top cover.

Rigging/Lifting of Unit (See Fig. 5)

Lifting holes are provided in base rails as shown in Fig. 2 and 3.

1. Leave top shipping skid on the unit for use as a spreaderbar to prevent the rigging straps from damaging the unit. If the skid is not available, use a spreader bar of sufficient length to protect the unit from damage.

2. Attach shackles, clevis pins, and straps to the base rails of the unit. Be sure materials are rated to hold the weight of the unit (See Fig. 5).

3. Attach a clevis of sufficient strength in the middle of the straps. Adjust the clevis location to ensure unit is lifted level with the ground.

After the unit is placed on the roof curb or mounting pad, remove the top skid.

Step 6 — Connect Condensate Drain

NOTE: When installing condensate drain connection be sure to

comply with local codes and restrictions. Model 48EZ--A disposes of condensate water through a 3/4 in.

NPT fitting which exits through the compressor access panel (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 condensateconnection 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 (See Fig. 6). 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 2--in. (51 mm) trap at the condensate connection to ensure proper drainage (See Fig. 6). Make sure that the outlet of the trap is at least 1 in. (25 mm) lower than the drain--pan condensate connection. This prevents the pan from overflowing.

Prime the trap with water. 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. (51 mm) trap. Do not undersize the tube. Pitch the drain tube downward at a slope of at least 1--in. (25 mm) for every 10 ft (3 m) of horizontal run. Be sure to check the drain tube for leaks.

TRAP OUTLET

1-in. (25 mm) min.

2-in. (51 mm) min.

A09052

Fig. 6 -- Condensate Trap

Step 7 — Install Flue Hood

The flue assembly is secured and shipped in the return air duct. Remove duct cover to locate the assembly (See Fig. 8 and 9).

NOTE: Dedicated low NOx models MUST be installed in California Air Quality Management Districts where a Low NOx rule exists.

These models meet the California maximum oxides of nitrogen (NOx) emissions requirements of 40 nanograms/joule or less as shipped from the factory.

NOTE: Low NOx requirements apply only to natural gas installations.

WARNING

CARBON MONOXIDE POISONING HAZARD

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

The venting system is designed to ensure proper venting. The flue hood assembly must be installed as indicted in this section of the unit installation instructions.

Install the flue hood as follows:

1. This installation must conform with local building codes and with the National Fuel Gas Code (NFGC) NFPA 54 / ANSI Z223.1, (in Canada, CAN/CGA B149.1, and B149.2) latest revision. Refer to Provincial and local plumbing or wastewater codes and other applicable local codes.

2. Remove flue hood from shipping location (inside the return section of the blower compartment--see Fig. 8 & 9). Remove the return duct cover to locate the flue hood. Place flue hood assembly over flue panel. Orient screw holes in flue hood with holes in the flue panel.

3. Secure flue hood to flue panel by inserting a single screw on the top flange and the bottom flange of the hood.

Step 8 — Install Gas Piping

The gas supply pipe enters the unit through the access hole provided. The gas connection to the unit is made to the 1/2--in. (12.7 mm) FPT gas inlet on the gas valve.

Install a gas supply line that runs to the heating section. Refer to Table 2 and the NFGC for gas pipe sizing. Do not use cast--iron pipe. It is recommended that a black iron pipe is used. Check the local utility for recommendations concerning existing lines. Size gas supply piping for 0.5 IN. W.C. maximum pressure drop. Never use pipe smaller than the 1/2--in. (12.7 mm) FPT gas inlet on the unit gas valve.

For natural gas applications, the gas pressure at unit gas connection must not be less than 4.0 IN. W.C. or greater than 13 IN. W.C. while the unit is operating. For propane applications, the gas pressure must not be less than 11.0 IN. W.C. or greater than 13 IN. W.C. at the unit connection.

48EZ --A

A 1/8--in. (3.2 mm) NPT plugged tapping, accessible for test gauge connection, must be installed immediately upstream of the gas supply connection to the gas valve.

When installing the gas supply line, observe local codes pertaining to gas pipe installations. Refer to the NFGC NFPA 54/ANSI Z223.1 latest edition (in Canada, CAN/CGA B149.1).

NOTE: In the state of Massachusetts:

1. Gas supply connections MUST be performed by a licensed plumber or gas fitter.

2. When flexible connectors are used, the maximum length shall not exceed 36 in. (915 mm).

3. When lever handle type manual equipment shutoff valves are used, they shall be T--handle valves.

4. The use of copper tubing for gas piping is NOT approved by the state of Massachusetts.

In the absence of local building codes, adhere to the following pertinent recommendations:

1. Avoid low spots in long runs of pipe. Grade all pipe 1/4 in. (6.35 mm) for every 15 ft (4.6 m) of length to prevent traps. Grade all horizontal runs downward to risers. Use risers to connect to heating section and to meter.

48EZ --A

2. Protect all segments of piping system against physical and thermal damage. Support all piping with appropriate straps, hangers, etc. Use a minimum of one hanger every 6 ft (1.8 m). For pipe sizes larger than 1/2 in., (12.7 mm) follow recommendations of national codes.

3. Apply joint compound (pipe dope) sparingly and only to male threads of joint when making pipe connections. Use only pipe dope that is resistant to action of liquefied petroleum gases as specified by local and/or national codes. Never use Teflon tape.

4. Install sediment trap in riser leading to heating section (See Fig. 7). This drip leg functions as a trap for dirt and condensate.

5. Install an accessible, external, manual main shutoff valve in gas supply pipe within 6 ft (1.8 m) of heating section.

6. Install ground--joint union close to heating section between unit manual shutoff and external manual main shut--off valve.

7. Pressure test all gas piping in accordance with local and national plumbing and gas codes before connecting piping to unit.

NOTE: Pressure test the gas supply system after the gas supply piping is connected to the gas valve. The supply piping must be disconnected from the gas valve during the testing of the piping systems when test pressure is in excess of 0.5 psig. Pressure test the gas supply piping system at pressures equal to or less than 0.5 psig. The unit heating section must be isolated from the gas piping system by closing the external main manual shutoff valve and slightly opening the ground--joint union.

WARNING

FIRE OR EXPLOSION HAZARD

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

--Connect gas pipe to unit using a backup wrench to avoid damaging gas controls.

--Never purge a gas line into a combustion chamber. Never test for gas leaks with an open flame. Use a commercially available soap solution made specifically for the detection of leaks to check all connections.

--Use proper length of pipe to avoid stress on gas control manifold.

--If a flexible connector is required or allowed by authority having jurisdiction, black iron pipe shall be installed at furnace gas valve and extend a minimum of 2 in. (51 mm) outside furnace casing.

--If codes allow a flexible connector, always use a new connector. Do not use a connector which has previously serviced another gas appliance.

8. Check for gas leaks at the field--installed and factory--installed gas lines after all piping connections have been completed. Use a commercially available soap solution made specifically for the detection of leaks (or method specified by local codes and/or regulations).

TEE

OUT

NIPPLE

CAP

C99020

Fig. 7 -- Sediment Trap

Table 1 – Physical Data -- Unit 48EZ--A

UNIT SIZE 48EZ ---A 24040 24060 30040 30060 36060 36090 42060 42090

NOMINAL C APACITY --- ton 2 2 2 --- 1 / 2 2 --- 1 / 2 3 3 3 --- 1 / 2 3 --- 1 / 2

SHIPPING WEIGHT ---lb.

COMPRESSORS Scroll

Quantity 1

REFRIGERANT (R --- 410A)

Quantity --- lb

REFRIGERANT METERING

Nominal Cooling Airflow---(CFM)

Natural Gas Qty...Drill Size (Factory Installed)

Propane GasQty...Drill Size

HIGH --- PRESSURE SWITCH

LOW---PRESSURE SWITCH

RETURN--- AIR FILTERS † }

*Based on altitude of 0 to 2000 ft (0 ---610 m). {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 high ---capacity type. Air filter pressure drop for non ---standard filters must not exceed 0.08 IN. W.C. } If using accessory filter rack refer to filter rack installation instructions for correct filter size and quantity.

DEVICE

OUTDOOR ORIFICE

in. (qty)

(mm)

OUTDOOR COIL

Rows...Fins/in. F a c e A r e a --- s q f t OUTDOOR FAN

Nominal Cfm Diameter--- in.

Motor Hp (Rpm)

INDOOR COIL

Rows...Fins/in. F a c e A r e a --- s q f t

INDOOR BLOWER

S i z e --- i n .

M o t o r --- h p

FURNACE SECTION*

Burner Orifice

( p s i g ) C u t --- o u t

Reset (Auto)

L O S S --- O F --- C H A R G E /

(Liquid Line) (psig)

C u t --- o u t

Reset (auto)

Throwaway (in.)

(kg)

(mm)

359 163

8.3

3.8

0.032 (2)

2...21

11.9

2000

610

1/5 (810)

3...17

3.7

800

10x10

254x254

1/2

2...44

2...55

20x20x1

508x508x25

.81

359 163

8.3

3.8

2...21

11.9

2000

610

1/5 (810)

3...17

3.7

800

10x10

254x254

1/2

2...38

2...53

373 169

10.2

4.6

0.035 (2)

2...21

11.9

2700

610

1/5 (810)

3...17

3.7

1000

10x10

254x254

1/2

2...44

2...55

20x24x1

508x610x25

373 169

10.2

4.6

I n do o r --- T X V, O u t door --- A cc u r a t e r

.89

2...21

11.9

2700

610

1/5 (810)

3...17

3.7

1000

10x10

254x254

1/2

2...38

2...53

650 +/---15 420 +/---25

2 0 + / --- 5

45 +/---10

379 172

7.9

3.6

2...21

11.9

2700

610

1/5 (810)

3...17

3.7

1200

11x10

279x254

3/4

2...38

2...53

0.037 (2) .94

379 172

7.9

3.6

2...21

11.9

2700

610

1/5 (810)

3...17

3.7

1200

11x10

279x254

3/4

3...38

3...53

610x762x25

24x30x1

461 209

10.0

4.5

0.038 (Left)

0.040(Right)

2...21

13.6

3100

660

1/5 (810)

3...17

4.7

1400

11x10

279x254

3/4

2...38

2...53

.97/1.02

1/5 (810)

279x254

461 209

10.0

4.5

2...21

13.6

3100

660

3...17

4.7

1400

11x10

3/4

3...38

3...53

48EZ --A

Table 1 -- Physical Data -- Unit 48EZ--A (Cont’d)

NUMBER

MANIFOLD

PRES

SURE

ORIFICES

UNIT SIZE 48EZ ---A 48090 48115 48130 60090 60115 60130

NOMINAL C APACITY --- ton 4 4 4 5 5 5

OPERATING WEIGHT --- lb

COMPRESSORS Scroll

Quantity 1

REFRIGERANT (R --- 410A)

Quantity --- lb

REFRIGERANT METERING DEVICE TXV

OUTDOOR ORIFICE ---in. (qty)

OUTDOOR COIL

Rows...Fins --- in. F a c e A r e a --- s q f t

OUTDOOR FAN

Nominal Cfm

Diameter--- in.

M o t o r H p --- R p m

INDOOR COIL Rows...Fins --- in. F a c e A r e a --- s q f t

INDOOR BLOWER

Nominal Cooling Airflow---(CFM)

48EZ --A

Natural Gas Qty...Drill Size (Factory Installed)

Propane GasQty...Drill Size

HIGH --- PRESSURE SWITCH (psig) Cut --- out

LOW---PRESSURE SWITCH

S i z e --- i n .

M o t o r --- h p

FURNACE SECTION*

Burner Orifice

Reset (Auto)

L O S S --- O F --- C H A R G E /

(Liquid Line) (psig)

C u t --- o u t

Reset (auto)

RETURN--- AIR FILTERS †

Throwaway (in.)

(mm)

(kg)

(kg )

(mm)

482 219

2...21

13.6

3100

660

1/5 (810)

3...17

4.7

1600

11x10

279x254

1.0

3...38

3...53

482 219

9.6

4.4

0.046 (2)

1.2

2...21

13.6

3100

660

1/5 (810)

3...17

4.7

1600

11x10

279x254

1.0

3...33

3...51

482 219

2...21

13.6

3100

660

1/5 (810)

3...17

4.7

1600

11x10

279x254

1.0

3...31

3...49 650 +/---15 420 +/---25

2 0 + / --- 5

45 +/---10

24x36x1

(610x914x25)

507 230

2...21

17.5

3500

660

1/5 (810)

3...17

5.7

1850

11x10

279x254

1.0

3...38

3...53

507 230

12.3

5.6

0.052 (2)

1.3

2...21

17.5

3500

660

1/5 (810)

3...17

5.7

1850

11x10

279x254

1.0

3...33

3...51

Table 2 – Maximum Gas Flow Capacity*

NOMINAL

IRON PIPE,

SIZE (IN.)

1/2 .622 175 120 97 82 73 66 61 57 53 50 44 40 — — 3/4 .824 360 250 200 170 151 138 125 118 110 103 93 84 77 72

1 1.049 680 465 375 320 285 260 240 220 205 195 175 160 145 135 1 --- 1 / 4 1.380 1400 950 770 600 580 530 490 460 430 400 360 325 300 280 1 --- 1 / 2 1.610 2100 1460 1180 990 900 810 750 690 650 620 550 500 460 430

* Capacity of pipe in cu ft of gas per hr for gas pressure of 0.5 psig or less. Pressure drop of 0.5---IN. W.C. (based on a 0.60 specific gravity gas). Refer toTable2 and National Fire Protection Association NFPA 54/ANSI Z223.1. † This length includes an ordinary number of fittings.

INTERNAL

DIAMETER

(IN.)

(3.1)20(6.1)30(9.1)40(12.2)50(15.2)60(18.3)70(21.3)80(24.4)90(27.4)

LENGTH OF PIPE, FT† (m)

100

(30.5)

125

(38.1)

(46.0)

150

175

(53.3)

507 230

2...21

17.5

3500

660

1/5 (810)

3...17

5.7

1850

11x10

279x254

1.0

3...31

3...49

200

(61.0)

Table 3 – Heating Inputs

HEATING INPUT

(BTUH)

GAS SUPPL Y PRESSURE (IN. W.C.)

Natural{ Propane*{

Min Max Min Max Natural{ Propane*†

40,000 2 4.0 13.0 11.0 13.0 3.2∼3.8 10.0∼11.0 60,000 2 4.0 13.0 11.0 13.0 3.2∼3.8 10.0∼11.0

90,000 3 4.0 13.0 11.0 13.0 3.2∼3.8 10.0∼11.0 115,000 3 4.0 13.0 11.0 13.0 3.2∼3.8 10.0∼11.0 130,000 3 4.0 13.0 11.0 13.0 3.2∼3.8 10.0∼11.0

*When a unit is converted to propane, different size or ifices must be used. See separate, natural --- to ---propane conversion kit instructions.

{Based on altitudes from sea level to 2000 ft (610 m) above sea level. In U.S.A. for al titudes above 2000 ft (610 m), reduce input rating 4 percent for each addi-

tional 1000 ft (305 m) above sea level. In Canada, from 2000 ft (610 m) above sea level to 4500 ft (1372 m) above sea level, dera te the unit 10 percent.

MANIFOLD PRESSURE

(IN. W.C.)

Step 9 — 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 connects to the roof curb (See Fig. 2 and 3 for connection sizes and locations).

Configuring Units for Downflow (Vertical) Discharge

ELECTRICAL SHOCK 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 and install lockout tag. There may bemore than one disconnect switch.

1. Open all electrical disconnects before starting any service

work.

2. Remove horizontal (metal) duct covers to access vertical

(downflow) discharge duct knockouts in unit basepan. (See Fig. 8.)

3. Using Fig. 9 as a guide, proceed to cut out the downflow

duct panels.

4. Drill 1/2 in. (13 mm) diameter or larger holes in all four

corners of duct panels.

NOTE: On large chassis units remove sheet metal shields on panels by using a screw driver to shear off retainers and discard.

5. On left and side supply duct opening side with keyhole or

single bladed hacksaw cut out panel along “V” groove.

6. On right side, with keyhole or single blade hacksaw, with

teeth facing up and starting from the front and moving to the rear, cut along “V” groove.

7. Now with three sides cut, flex panel up and down to re-

move.

8. Replace side access panel and duct cover.

9. After completing unit conversion, perform all safety checks

and power up unit.

Alternate Method

1. Open all electrical disconnects and install lockout tag before

starting any service work.

2. Remove horizontal (metal) ductcovers to access vertical

(downflow) discharge duct knockouts in unit basepan. (See Fig. 8.)

3. Leave top shipping crate on unit during this method.

4. Tip unit over on the front side (access panels) so the bottom

of the base pan is accessible.

5. Drill two holes diagonally opposed, of suitable size to ac-

commodate jigsaw or reciprocating saw. (See Fig. 9.)

NOTE: On large chassis units remove sheet metal shields on panels by using a screw driver to shear off retainers and discard.

WARNING

CAUTION

PROPERTY DAMAGE HAZARD

Failure to follow this caution may result in property damage. Collect ALL screws that were removed. Do not leave screws

on rooftop as permanent damage to the roof may occur.

6. Using a suitable saw cut along “V” groove and remove duct panels.

7. Tip unit back onto its base and replace duct covers.

8. 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:

1. Units are shipped for horizontal duct installation (by removing duct covers).

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

3. 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 weather tight and airtight seal.

4. 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 Table 1.

5. 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.

6. 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.

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

48EZ --A

UNIT COMPONENT DAMAGE HAZARD

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

When cutting duct panels, do not contact or damage any internal components (heat exchanger, electric heat). Do not use a saw blade that protrudes more than 1 in. (25 mm) into unit.

CAUTION

Return Duct Panels

Horizontal Duct Covers

A09061

Basepan Downflow (Vertical) Supply Knockout

48EZ --A

Basepan Downflow (Vertical) Return Knockout

A09060

Supply Duct Panels

Fig. 8 -- Supply and Return Duct Opening

Return & Supply Duct Panels from Underside of Base (Alternate Method)

A09420

Fig. 9 -- Vertical (Downflow) Discharge Duct Knockouts

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