Bryant 574D User Manual

Page 1

574D SINGLE ---PACKAGED AIR CONDITIONER GAS FURNACE SYSTEM WITH PURONR (R---410A) REFRIGERANT SINGLE AND THREE PHASE 1--- 1/2 ---5 NOMINAL TONS (SIZES 018--- 060)

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--12.................

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

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

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

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

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

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

Ground Mount 2..................................

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

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

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

Inspection 6......................................

Use of Rigging Bracket 6............................

Connect Condensate Drain 8...........................

Install Flue Hood 8...................................

Install Gas Piping 9..................................

Install Duct Connections 9--10..........................

Configuring Units for Downflow (Vertical)

Discharge 9--10...................................

Install Electrical Connections 11........................

High--Voltage Connections 11........................

Special Procedures for 208--V Operation 11..............

Control Voltage Connections 11.......................

Heat Anticipator Setting 12..........................

Transformer Protection 12...........................

P R E -- S T A R T -- U P 1 2 -- 1 3................................

START--UP 13--19.....................................

Check for Refrigerant Leaks 13.........................

Start--Up Heating & Make Adjustments 13................

Check Heating Control 13...........................

Check Gas Input 13................................

Adjust Gas Input 14................................

Check Burner Flame 14.............................

Airflow and Temperature Rise 14......................

Heating Sequence of Operation 18.....................

Limit Switches 18.................................

Rollout Switch 18.................................

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

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

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

Indoor Airflow and Airflow Adjustments 19.............

Cooling Sequence of Operation 19.....................

MAINTENANCE 23--2 6................................

Air Filter 23......................................

Indoor Blower and Motor 23.........................

Flue Gas Passageways 24............................

Induced Draft (Combustion Air) Blower 24..............

Limit Switch 24...................................

Burner Ignition 24.................................

Main Bu rners 24...................................

Outdoor Coil, Indoor Coil, & Condensate Drain Pan 24....

Outdoor Fan 25...................................

Electrical Controls and Wiring 25.....................

Refrigerant Circuit 26...............................

Gas Input 26......................................

Evaporator Airflow 26..............................

Puron Items 26....................................

TROUBLESHOOTING 27..............................

START--UP CHECKLIST 27............................

SAFETY CONSIDERATIONS

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. Installation must be in compliance with local and national building 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.

Fig. 1 -- Unit 574D

(Low NOx Model Available)

A99338

Page 2

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.

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

574D

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

WARNING

FIRE, EXPLOSION, ELECTRICAL SHOCK AND CARBON MONOXIDE POISONING HAZARD

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

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

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 distribution office if any item is missing. To prevent loss or damage, leave all parts in original packages until installation.

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. 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 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. 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. (101.6 mm) thick with 2 in. (50.8 mm) above grade (See Fig.

2). The slab should extend approximately 2 in. beyond the casing on all 4 sides of the unit. Do not secure the unit to the slab except when required by local codes.

OPTIONAL

RETURN

AIR

OPENING

OPTIONAL

SUPPLY

AIR

OPENING

INTRODUCTION

The 574D unit (see Fig. 1) is a fully self--contained, combination Category I gas heating/electric cooling unit designed for outdoor installation (See Fig. 3 and 4 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, a cement slab, or directly on the ground, if local codes permit (See Fig. 5 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.

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

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 while unit is still on shipping pallet. If unit appears to be damaged or is torn loose from its anchorage,

EVAP. COIL COND. COIL

C99096

Fig. 2 -- Slab Mounting Details

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 — Field Fabricate Ductwork

Secure all ducts to roof curb and building structure on vertical discharge units. Do not connect ductwork to unit. For horizontal applications, unit is provided with flanges on the horizontal openings. All ductwork should be secured to the flanges. Insulate and weatherproof all external ductwork, joints, and roof openings with counter flashing and mastic in accordance with applicable codes.

Ducts passing through an unconditioned space must be insulated and covered with a vapor barrier.

If a plenum return is used on a vertical unit, the return should be ducted through the roof deck to comply with applicable fire codes.

A minimum clearance is not required around ductwork. Cabinet return--air static shall not exceed -- .25 in. wc.

Page 3

REQUIRED CLEARANCE TO COMBUSTIBLE MATL (

efe

r t

aximu

perating

learance

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

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

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

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

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]

LEGEND

CG - Center of Gravity COND - Condensor EVAP - Evaporator NEC - National Electrical Code REQ’D - Required

NOTE: Dimensions are in in. [mm]

)

INCHES [mm]

REQUIRED CLEARANCE FOR OPERATION AND SERVICING

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

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

(EXCEPT FOR NEC REQUIREMENTS)

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

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

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

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

INCHES [mm]

574D

A05166

UNIT

ELECTRICAL

CHARACTERISTICS

UNIT WEIGHT

lb kg X Y Z

UNIT HEIGHT

IN. [MM]

“A”

CENTER OF GRAVITY

IN. [MM]

574D018 208/230--1 --60 282 127.9 37.02 [940] 23.3 [591.8] 15.5 [393.7] 15.5 [393.7] 574D024 208/230--1 --60 296 134.2 37.02 [940] 23.6 [599.4] 15.8 [401.3] 15.7 [398.8] 574D030 208/230--1 --60, 208/230--3--60 313 142.0 39.02 [991] 23.3 [591.8] 15.7 [398.8] 15.8 [401.3]

574D036

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

460--3--60

338 153.3 41.02 [1042] 23.0 [584.2] 15.8 [401.3] 16.6 [421.6]

Fig. 3 -- 574D018--036 Unit Dimensions

Page 4

574D

REQUIRED CLEARANCE TO COMBUSTIBLE MATL

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

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

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

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

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

NEC. REQUIRED CLEARANCES.

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

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

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

INCHES [mm]

REQUIRED CLEARANCE FOR OPERATION AND SERVICING

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

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

(EXCEPT FOR NEC REQUIREMENTS)

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

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

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

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

LEGEND CG - Center of Gravity COND - Condensor EVAP - Evaporator NEC - National Electrical Code REQ’D - Required

INCHES [mm]

NOTE: Dimensions are in in. [mm]

A05142

UNIT

ELECTRICAL

CHARACTERISTICS

UNIT WEIGHT

lb kg X Y Z

UNIT HEIGHT

IN. [MM]

“A”

CENTER OF GRAVITY

IN. [MM]

574D042 208/230--1 --60, 208/230--3--60, 460--3--60 401 181.9 42.98 [1092] 25.5 [647.7] 20.5 [520.7] 17.1 [434.3] 574D048 208/230--1 --60, 208/230--3--60, 460--3--60 418 189.6 42.98 [1092] 25.2 [640.1] 20.7 [525.8] 17.4 [442.0] 574D060 208/230--1 --60, 208/230--3--60, 460--3--60 446 202.3 46.98 [1193] 25.5 [647.7] 21.0 [533.4] 17.6 [447.0]

Fig. 4 -- 574D042--060 Unit Dimensions

Page 5

HVAC unit

Scre w

(NO TE A)

*Gask eting

outer flange

Flashing field

supplied

Roofing material

field supplied

Cant str ip

field supplied

base

Gask eting

inner flange*

Wood nailer*

Roof curb*

Insulation (field

supplied)

Ductwork

field supplied

HVAC unit

Scre w

(NOTE A)

*Gask eting

outer flange

Flashing field

supplied

Roofing material

field supplied

Cant str ip

field supplied

base

Gask eting

inner flange*

Ductwork

field supplied

Wood nailer*

Roof curb*

Insulation (field

supplied)

*Provided with roof curb

Roof Curb for Small Cabinet

Note A: When unit mounting scre w is used,

Return opening

UNIT SIZE

574D018--036

574D042--060

retainer bra cke t must also be used.

(B X C)

ODS CATALOG

NUMBER

CPRFCURB006A00 8 (203) 11 (279) 16--1/2 (419) 28--3/4 (730) 30 --3/8 (771) 44--5/16 (1126) 45 --15/16 (1167) CPRFCURB007A00 14 (356) 11 (279) 16--1/2 (419) 28--3/4 (730) 30 --3/8 (771) 44 --5/16 (1126) 45 --15/16 (1167) CPRFCURB008A00 8 (203) 16--3/16 (411) 17--3/8 (441) 40--1/4 (1022) 41--15/16 (1065) 44--7/16 (1129) 46 --1/16 (1169) CPRFCURB009A00 14 (356) 16 --3/16 (411) 17--3/8 (441) 40--1/4 (1022) 41--15/16 (1065) 44--7/16 (1129) 46--1/16 (1169)

B Typ.

Insulated deck pan

Roof

Supply opening

(B x C)

C Typ.

Short

Support

Long

Support

IN. (MM)BIN. (MM)

IN. (MM)

*Provided with roof curb

Roof Curb for Large Cabinet

Note A: When unit mounting scre w is used,

retainer bra cket must also be used.

R/A

Insulated deck pan

IN. (MM)

Gask et around

duct

Gask et around

outer edge

IN. (MM)

Roof

S/A

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. thick fiberglass 1 lb. density.

6. When unit mounting screw is used (see Note A), a retainer bracket m ust be used as well. This bracket must also be used when required b y code for hurricaneorseismic conditions. This bracket is available through Micrometl.

Fig. 5 -- Roof Curb Dimensions

A05308

IN. (MM)

574D

Step 4 — Provide Clearances

The required minimum operating and service clearances are shown in Fig. 3 and 4. Adequate combustion, ventilation and condenser air must be provided in accordance with section 5.3, Air for

Combustion and Ve ntilation, of the National Fuel Gas Code ANSI (American National Standards Institute) Z223.1 or applicable provisions of local building code. In Canada, follow sections 7.2,

7.3, or 7.4 or Can/CGA (Canadian Gas Association) B149 Installation Codes or applicable provisions of local building code.

Page 6

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. (1219.19 mm) above the unit top. The maximum horizontal extension of a partial overhang must not exceed 48--in. (1219.19 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. Slab--mounted units should be at least 4 in. above the highest expected water and runoff levels. Do not use unit if it has been under water.

Step 5 — Rig and Place Unit

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

574D

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.

INSPECTION

The lifting/rigging bracket is engineered and designed to be installed only on Small Packaged Products. This bracket is to be used to rig/lift a Small Packaged Product onto roofs or other elevated structures.

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.

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.

Rigging brackets for one unit use only. When removing a unit at the end of its useful life, use a new set of brackets.

USE OF RIGGING BRACKET Field Installation of Rigging Bracket (if not alr

eady

installed)

1. Remove unit from shipping carton. Leave top shipping skid on the unit for use as a spreader bar 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. Remove 4 screws in unit corner posts.

3. Attach each of the 4 metal rigging brackets under the panel rain lip (See Fig. 6). Use the screws removed in step 2 above to secure the brackets to the unit.

WARNING

PROPERTY DAMAGE HAZARD

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

Rigging bracket MUST be under the rain lip to provide adequate lifting.

WARNING

PROPERTY DAMAGE HAZARD

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

Do not strip screws when re--securing the unit. If a screw is stripped, replace the stripped one with a larger diameter screw (included). When straps are taut, the clevis should be a minimum of 36 in. (914.4 mm) above the unit top cover.

Rigging/Lifting of Unit

1. Bend top of brackets down approximately 30 degrees from the corner posts.

2. Attach straps of equal length to the rigging brackets at opposite ends of the unit. Be sure straps are rated to hold the weight of the unit (See Fig. 6).

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.

4. Remove corner post screws and rigging brackets, then re--install screws.

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

Page 7

UNIT SIZE 018040 024040 024060 030040 030060 036060 036090 042060 042090

Table 1 – Physical Data -- Unit 574D

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

OPERATIN G WEIGHT (lb) OPERATIN G WEIGHT(kg)

COMPRESSORS

Quantity

REFRIGERANT (R --- 410A)

Quantity (lb.) Quantity (kg)

REFRIGERAN T METER ING DEV ICE TXV

CONDENSER COIL

Rows...Fins/in. Face Area (sq ft )

CONDENSER FAN

Nominal Cfm Diameter (in.) Diameter (mm) Motor Hp (Rpm)

EVAPORATOR COIL

Rows...Fins/in. Face Area (sq ft )

INDOOR BLOWER

Nominal Airflow (Cfm) Size (in.) Size (mm) Motor HP (RPM)

FURNACE SECTION*

Burner Orifice No. (Qty...Drill Size) Natural Gas Propane Gas

HIGH-- PRESSURE SWITCH (psig) Cut-- out Reset (Auto) LOSS--OF--CHARGE / LOW-- PRESSURE SWITCH (Liquid Line) (psig) cut-- out Reset (auto)

RETURN--- AIR FILTERS (in.)†}

Throwaway

282

127.9

5.0

2.3

1...21

10.2

2200

558.8

1/8 (825)

3...17

3.7

650

10x10

254x254

1/4 (825)

2...44

2...50

296

134.2

6.9

3.1

2...21

10.2

2200

558.8

1/8 (825)

3...17

3.7

800

10x10

254x254

1/3 (1050)

2...44

2...50

296

134.2

6.9

3.1

2...21

10.2

2200

558.8

1/8 (825)

3...17

3.7

800

10x10

254x254

1/3 (1050)

2...38

2...46

20x24x1

508x610x25 (mm)

313

142.0

8.0

3.6

2...21

11.9

2800

558.8

1/8 (825)

3...17

3.7

1000

10x10

254x254

1/3 (1050)

2...44

2...50

313

142.0 Scroll

8.0

3.6

2...21

11.9

2800

558.8

1/8 (825)

3...17

3.7

1000

10x10

254x254

1/3 (1050)

2...38

2...46

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

20 +/-- 5

45 +/-- 10

338

153.3

9.2

4.2

2...21

13.6

3000

558.8

1/8 (825)

4...17

3.7

1200

10x10

254x254

1/2 (1000)

2...38

2...46

24x30x1

610x762x25 (mm)

338

153.3

9.2

4.2

2...21

13.6

3000

558.8

1/8 (825)

4...17

3.7

1200

10x10

254x254

1/2 (1000)

3...38

3...46

401

181.9

8.8

4.0

2...21

19.4

3500

558.8

1/8 (825)

3...17

4.7

1400

11x10

279.4x254 1/2 (1075)

2...38

2...46

24x36x1

610x914x25 (mm)

401

181.9

8.8

4.0

2...21

3500

558.8

1/8 (825)

3...17

4.7

1400

11x10

279.4x254 1/2 (1075)

2...38

2...46

19.4

574D

Table 1—Physical Data Con’t -- Unit 574D

UNIT SIZE 048090 048115 048130 060090 060115 060130 NOMINAL CAPACITY (ton) 4 4 4 5 5 5 OPERATING WEIGHT (lb)

OPERATING WEIGHT (kg)

COMPRESSORS

Quantity

REFRIGERANT (R--410A)

Quantity (lb.) Quantity (kg)

REFRIGERANT METERING DEVICE TXV CONDENSER COIL

Rows...Fins/in. Face Area (sq ft)

CONDENSER FAN

Nominal Cfm Diameter (in.) Diameter (mm) Motor Hp (Rpm)

EVAPORATOR COIL

Rows...Fins/in. Face Area (sq ft)

INDOOR BLOWER

Max Size (In.)

Size (mm)

Motor HP (RPM)

FURNACE SECTION* Burner Orifice No. (Qty...Drill Size)

Natural Gas Propane Gas

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

LOSS-- OF -- CHARGE / LOW--PRESSURE SWITCH (Liquid Line) (psig) cut --out Reset (auto)

RETURN-- AIR FILTERS (in.)†}

Throwaway

*Based on altitude of 0 to 2000 ft. { 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.

} If using accessory filter rack refer to the filter rack installation instructions for correct filter sizes and quantity.

418

189.6

9.0

4.1

2...21

19.4

3500

558.8

1/4 (1100)

3...17

5.7

1600

11x10

279.4x254 1/2 (1075)

3...38

3...46

418

189.6

9.0

4.1

2...21

19.4

3500

558.8

1/4 (1100)

3...17

5.7

1600

11x10

279.4x254 1/2 (1075)

3...33

3...42

418

189.6

9.0

4.1

2...21

19.4

3500

558.8

1/4 (1100)

3...17

5.7

1600

11x10

279.4x254 1/2 (1075)

3...31

3...41

610x914x25 (mm)

Scroll

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

20 +/-- 5

45 +/-- 10

24x36x1

446

202.3

10.5

4.8

2...21

19.4

4200

558.8

1/4 (1100)

4...17

5.7

2000

11x10

279.4x254

1.0 (1040)

3...38

3...46

446

202.3

10.5

4.8

2...21

19.4

4200

558.8

1/4 (1100)

4...17

5.7

2000

11x10

279.4x254

1.0 (1040)

3...33

3...42

446

202.3

10.5

4.8

2...21

19.4

4200

558.8

1/4 (1100)

4...17

5.7

2000

11x10

279.4x254

1.0 (1040)

3...31

3...41

Page 8

DETAIL A

A07216

CORNER WEIGHTS (SMALL CABINET) CORNER WEIGHTS (LARGE CABINET)

574D

Unit

Total Weight 282 127.9 296 134.2 313 142.0 338 153.3 Total Weight 401 181.9 418 189.6 446 202.3

Corner

Weight 1

Corner

Weight 2

Corner

Weight 3

Corner

Weight 4

Rigging

Weight

Shipping

Weight

Step 6 — Connect Condensate Drain

NOTE: When installing condensate drain connection be sure to

comply with local codes and restrictions.

Model 574D disposes of condensate water through a 3/4 in. NPT fitting which exits through the base on the evaporator coil access side. See Fig. 3 & 4 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 2--in. (50.8 mm) condensate trap at the end of condensate connection to ensure proper drainage. Make sure that the outlet of the trap is at least 1 in. (25.4 mm) lower than the drain--pan condensate connection to prevent the pan from overflowing (See Fig. 7). Prime the trap with water. 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. (50.8 mm) trap. Do not undersize the tube. Pitch the drain tube downward at a slope of at least 1 --in. for every 10 ft of horizontal run. Be sure to check the drain tube for leaks.

1" min.

018 024 030 036 Unit 042 048 060

lb kg lb kg lb kg lb kg Total Weight lb kg lb kg lb kg

73 33.1 59 26.8 55 25.1 72 32.5

60 27.4 84 38.0 95 42.9 89 40.3

95 43.0 81 36.8 78 35.2 95 43.0

54 24.4 72 32.6 85 38.7 83 37.5

301 136.5 315 142.9 332 150.6 357 161.9

336 152.4 350 158.7 367 166.4 392 177.8

Corner

Weight 1

Corner

Weight 2

Corner

Weight 3

Corner

Weight 4

Rigging

Weight

Shipping

Weight

68 30.6 62 28.1 54 24.5

119 53.8 135 61.2 158 71.7

60 27.2 64 29.2 81 36.6

155 70.3 157 71.1 154 69.7

423 191.8 440 199.5 468

463 210.0 480 217.7 508 230.4

Fig. 6 -- 574D Unit Corner Weights (in Pounds) and Suggested Rigging

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. 9 and 10).

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.

TRAP OUTLET

Fig. 7 -- Condensate Trap

2" min.

C00009

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), ANSI Z223.1 (in Canada, CAN/CGA B149.1, and B149.2) or NFPA (National Fire Protection Association) 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. 9 & 10). 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.

A05161

212.2

Page 9

3. Secure flue hood to flue panel by inserting a single screw on the right side and the left side 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. 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. wc maximum pressure drop. Never use pipe smaller than the 1/2--in. 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. wc or greater than 13 in. wc while the unit is operating. For propane applications, the gas pressure must not be less than 7.0 in. wc or greater than 13 in. wc at the unit connection.

A 1/8--in. 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 ANSI Z223.1-- 2005 NFPA 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 inches (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. for every 15 ft of length to prevent traps. Grade all horizontal runs downward to risers. Use risers to connect to heating section and to meter.

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., 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. 8). 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. 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 soap--and--water solution (or method specified by local codes and/or regulations).

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. 3 and 4 for connection sizes and locations).

CONFIGURING UNITS FOR DOWNFLOW (VERTICAL)

DISCHARGE

WARNING

574D

OUT

Fig. 8 -- Sediment Trap

TEE

NIPPLE

CAP

C99020

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. There may be more than one disconnect switch.

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

Page 10

2. Remove horizontal (metal) duct covers to access vertical (downflow) discharge duct knockouts in unit base.

3. Use a screwdriver and hammer to remove the panels in the bottom of the unit base (See Fig. 10).

4. If unit ductwork is to be attached to vertical opening flanges on the unit base (jackstand applications only), do so at this time.

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.

5. It is recommended that the base insulation around the

574D

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

6. Cover both horizontal duct openings with the provided duct covers. 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.

SUPPLY DUCT OPENING

RETURN DUCT OPENING

VENT HOOD SHIPPING LOCATION

Fig. 9 -- Supply and Return Duct Opening

A05143

DUCT COVERS REMOVED

C99012

Fig. 10 -- Vertical Duct Cover Removed

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.

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. wc (based on a 0.60 specific gravity gas). Refer to Table, National Fire Protection Association NFPA 54.

{ This length includes an ordinary number of fittings.

INTERNAL DIAMETER

(IN.)

LENGTH OF PIPE (FT)†

10 20 30 40 50 60 70 80 90 100 125 150 175 200

Page 11

Step 10 — Install Electrical Connections

WARNING

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 American National Standards Institute/National Fire Protection Association (latest edition) (in Canada, Canadian Electrical Code CSA C22.1) and local electrical codes.

UNIT COMPONENT DAMAGE HAZARD

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

1. Make all electrical connections in accordance with NEC ANSI/NFPA (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.

HIGH--VOLTAGE CONNECTIONS

When routing power leads into unit, use only copper wire between disconnect and unit. The high voltage leads should be in a conduit until they enter the duct panel; conduit termination at the duct panel must be watertight.

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 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. 3 and 4 for acceptable location).

See unit wiring label and Fig. 11 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 (L1, L2) and ground lead into the control box.

2. Connect ground lead to chassis ground connection.

CAUTION

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

4. Connect field L1 to black wire on connection 11 of the compressor contactor.

5.ConnectfieldwireL2toyellowwireonconnection23of the compressor contactor.

Three--phase units:

1. Run the high--voltage (L1, L2, L3) and ground lead into the control box.

2. Connect ground lead to chassis ground connection.

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

4. Connect field L1 to black wire on connection 11 of the compressor contactor.

5.ConnectfieldwireL2toyellowwireonconnection13of the compressor contactor.

6. Connect field wire L3 to blue wire from compressor.

SPECIAL PROCEDURES FOR 208--V OPERATION

WARNING

ELECTRICAL SHOCK HAZARD

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

Make sure the power supply to the unit is switched OFF before making any wiring changes. With disconnect switch open, move black wire from transformer (3/16 in.) terminal marked 230 to terminal marked 208. This retaps transformer to primary voltage of 208 vac.

WARNING

ELECTRICAL SHOCK FIRE/EXPLOSION HAZARD

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

Before making any wiring changes, mak e sure the gas supply is switched off first. Then switch off the power supply to the unit and install lockout tag.

CONTROL VOLTAGE CONNECTIONS

Do not use any type of power--stealing thermostat. Unit control problems may result.

Use no. 18 American Wire Gage (AWG) color--coded, insulated (35_C minimum) wires to make the control voltage connections between the thermostat and the unit. If the thermostat is located more than 100 ft (30.5 m) from the unit (as measured along the control voltage wires), use no. 16 AWG color--coded, insulated (35_C minimum) wires.

STANDARD CONNECTION

Remove knockout hole located in the flue panel adjacent to the control access panel (See Fig. 3 and 4). Remove the rubber grommet from the installer’s packet (included with unit) and install grommet in the knockout opening. Provide a drip loop before running wire through panel.

574D

Page 12

HIGH VOLTAGE

POWER LEADS (SEE UNIT WIRING LABEL)

FIELD-SUPPLIED FUSED DISCONNECT

WHT(W1)

YEL(Y)

GRN(G)

RED(R)

BRN(C)

CONTROL BOX

LOW-VOLTAGE POWER LEADS (SEE UNIT WIRING LABEL)

SPLICE BOX

Fig. 11 -- High-- and Control--Voltage Connections

574D

Run the low--voltage leads from the thermostat, through the inlet hole, and into unit low--voltage splice box.

Locate five 18--gage wires leaving control box. These low--voltage connection leads can be identified by the colors red, green, yellow, brown, and white (See Fig. 11). Ensure the leads are long enough to be routed into the low--voltage splice box (located below right side of control box). Route leads through hole in bottom of control box and make low--voltage connections (See Fig. 11). Secure all cut wires, so that they do not interfere with operation of unit.

HEAT ANTICIP ATOR SETTING

The room thermostat heat anticipator must be properly adjusted to ensure proper heating performance. Set the heat anticipator, using an ammeter between the W and R terminals to determine the exact required setting.

NOTE: For thermostat selection purposes, use 0.18 amp for the approximate required setting. Failure to make a proper heat anticipator adjustment will result in improper operation, discomfort to the occupants of the conditioned space, and inefficient energy utilization; however, the required setting may be changed slightly to provide a greater degree of comfort for a particular installation.

TRANSFORMER PROTECTION

The transformer is of the energy-- limiting type. It is set to withstand a 30--sec. overload or shorted secondary condition. If an overload or short is present, correct overload condition and check for blown fuse on gas control board. Replace fuse as required with correct size and rating.

POWER SUPPLY

THERMOSTA (TYPICAL)

A05144

PRE--START--UP

WARNING

FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD

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

1. Follow recognized safety practices and wear protective goggles when checking or servicing refrigerant system.

2. Do not operate compressor or provide any electric power to unit unless compressor terminal cover is in place and secured.

3. Do not remove compressor terminal cover until all electrical sources are disconnected and tagged.

4. Relieve and recover all refrigerant from system before touching or disturbing anything inside terminal box if refrigerant leak is suspected around compressor terminals.

5. Never attempt to repair soldered connection while refrigerant system is under pressure.

6. Do not use torch to remove any component. System contains oil and refrigerant under pressure. To remove a component, wear protective goggles and proceed as follows:

a. Shut off electrical power to unit and install

lockout tag.

b. Relieve and reclaim all refrigerant from system

using both high-- and low--pressure ports.

c. Cut component connecting tubing with tubing

cutter and remove component from unit.

d. Carefully unsweat remaining tubing stubs when

necessary. Oil can ignite when exposed to torch flame.

Use the Start--Up Checklist supplied at the end of this book and proceed as follows to inspect and prepare the unit for initial start--up:

1. Remove access panel.

2. Read and follow instructions on all DANGER, WARNING, CAUTION, and INFORMATION labels attached to, or shipped with unit.

3. Make the following inspections:

a. Inspect for shipping and handling damage, such as

broken lines, loose parts, disconnected wires, etc.

b. Inspect for oil at all refrigerant tubing connections and

on unit base. Detecting oil generally indicates a refrigerant leak.

c. Leak-- test all refrigerant tubing connections using

electronic leak detector, or liquid--soap solution. If a refrigerant leak is detected, see following Check for Refrigerant Leaks section.

d. Inspect all field-- and factory--wiring connections. Be

sure that connections are completed and tight.

e. Ensure wires do not touch refrigerant tubing or sharp

sheet metal edges.

f. Inspect coil fins. If damaged during shipping and

handling, carefully straighten fins with a fin comb.

Page 13

WARNING

FIRE, EXPLOSION HAZARD

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

Do not purge gas supply into the combustion chamber. Do not use a match or other open flame to check for gas leaks.

4. Verify the following conditions:

a. Make sure gas line is free of air. Before lighting the unit

for the first time, perform the following with the gas valve in the OFF position:

NOTE: If the gas supply pipe was not purged before connecting the unit, it will be full of air. It is recommended that the ground joint union be loosened, and the supply line be allowed to purge until the odor of gas is detected. Never purge gas lines into a combustion chamber. Immediately upon detection of gas odor, retighten the union. Allow 5 minutes to elapse, then light unit.

b. Make sure that condenser--fan blade is correctly

positioned in fan orifice. Top 1/3 of condenser--fan blade should be within fan orifice venturi.

c. Ensure fan hub is positioned correctly with respect to

motor housing (See Fig. 12).

d. Make sure that air filter(s) is in place.

e. Make sure that condensate drain trap is filled with water

to ensure proper drainage.

f. Make sure that all tools and miscellaneous loose parts

have been removed.

MOTOR

FAN GRILLE

properly aligned. Unstable operation my occur when the burner orifices in the manifold are misaligned.

Follow the lighting instructions on the heating section operation label (located inside the burner or blower access door) to start the heating section.

NOTE: Make sure that gas supply has been purged, and that all gas piping has been checked for leaks.

574D

MANIFOLD PIPE PLUG

C99019

Fig. 13 -- Burner Assembly

BURNER FLAME

1/8" MAX BETWEEN MOTOR AND FAN HUB

Fig. 12 -- Fan Blade Clearance

MOTOR SHAFT

1/2ý

C99009

START--UP

Step 1 — Check for Refrigerant Leaks

Proceed as follows to locate and repair a refrigerant leak and to charge the unit:

1. Locate leak and make sure that refrigerant system pressure has been relieved and reclaimed from both high-- and low--pressure ports.

2. Repair leak following accepted practices.

NOTE: Install a filter drier whenever the system has been opened for repair.

3. Add a small charge of Puron (R--410A) refrigerant vapor to system and leak --test unit.

4. Recover refrigerant from refrigerant system and evacuate to 500 microns if no additional leaks are found.

5. Charge unit with Puron (R--410A) refrigerant, using a volumetric charging cylinder or accurate scale. Refer to unit rating plate for required charge.

Step 2 — Start--up Heating and Make Adjustments

Complete the required procedures given in the Pre--Start--Up section before starting the unit. Do not jumper any safety devices when operating the unit. Make sure that burner orifices are

BURNER

MANIFOLD

C99021

Fig. 14 -- Monoport Burner

CHECK HEATING CONTROL

Start and check the unit for proper heating control operation as follows (see furnace lighting instructions located inside burner or blower access panel):

1. Place room thermostat SYSTEM switch in the HEAT position and the fan switch is placed in AUTO position.

2. Set the heating temperature control of the thermostat above room temperature.

3. The induced--draft motor will start.

4. After a call for heating, the main burner should light within 5 sec. If the burners do not light, there is a 22--sec. delay before another 5--sec. try. If the burners still do not light, this sequence is repeated. If the burners do not light within 15 minutes from the initial call for heat, there is a lockout. To reset the control, break the 24--v power to W.

5. The evaporator fan will turn on 45 sec. after the flame has been established. The evaporator fan will turn off 45 sec. after the thermostat has been satisfied.

Page 14

CHECK GAS INPUT

Check gas input and manifold pressure after unit start--up (See Table 3). If adjustment is required proceed as follows:

S The rated gas inputs shown in Table 3 are for altitudes from sea

level to 2000 ft above sea level. These inputs are based on natural

gas with a heating value of 1050 Btu/ft

propane gas with a heating value of 2500 Btu/ft

gravity.

S For elevations above 2000 ft, reduce input 4% for each 1000 ft

above sea level. For example at 2500 ft. a 10% total derate is

required.

S When the gas supply being used has a different heating value or

specific gravity, refer to national and local codes, or contact your

distributor to determine the required orifice size.

574D

UNIT DAMAGE HAZARD

Failure to follow this caution may result in reduced unit and/or component life.

Do Not redrill an orifice. Improper drilling (burrs, out--of--round holes, etc.) can cause excessive burner noise and misdirection of burner flame. If orifice hole appears damaged or it is suspected to have been redrilled, check orifice hole with a numbered drill bit of correct size.

CAUTION

at 0.65 specific gravity, or

ADJUST GAS INPUT

The gas input to the unit is determined by measuring the gas flow at the meter or by measuring the manifold pressure. Measuring the gas flow at the meter is recommended for natural gas units. The manifold pressure must be measured to determine the input of propane gas units.

Measure Gas Flow (Natural Gas Units)

Minor adjustment to the gas flow can be made by changing the manifold pressure. The manifold pressure must be maintained between 3.4 and 3.6 in. wc.

If larger adjustments are required, change main burner orifices following the recommendations of national and local codes.

NOTE: All other appliances that use the same meter must be turned off when gas flow is measured at the meter.

Proceed as follows:

1. Turn off gas supply to unit.

2. Remove pipe plug on manifold (See Fig. 13) and connect manometer. Turn on gas supply to unit.

3. Record number of seconds for gas meter test dial to make one revolution.

4. Divide number of seconds in Step 3 into 3600 (number of seconds in one hr).

5. Multiply result of Step 4 by the number of cubic feet (cu ft) shown for one revolution of test dial to obtain cubic feet (cu ft) of gas flow per hour.

6. Multiply result of Step 5 by Btu heating value of gas to obtain total measured input in Btuh. Compare this value with heating input shown in Table 3 (Consult the local gas supplier if the heating value of gas is not known).

EXAMPLE: Assume that the size of test dial is 1 cu ft, one revolution takes 32 sec, and the heating value of the gas is 1050

. Proceed as follows:

Btu/ft

1. 32 sec. to complete one revolution.

2. 3600 ÷ 32 = 112.5.

3.112.5x1=112.5ft3ofgasflow/hr.

at 1.5 specific

4. 112.5 x 1050 = 118,125 Btuh input.

If the desired gas input is 115,000 Btuh, only a minor change in the manifold pressure is required.

Observe manifold pressure and proceed as follows to adjust gas input:

1. Remove cover screw over regulator adjustment screw on gas valve.

2. Turn regulator adjustment screw clockwise to increase gas input, or turn regulator adjustment screw counterclockwise to decrease input. Manifold pressure must be between 3.4 and 3.6 in. wc.

WARNING

FIRE AND UNIT DAMAGE HAZARD

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

Unsafe operation of the unit may result if manifold pressure is outside this range.

3. Replace cover screw cap on gas valve.

4. Turn off gas supply to unit. Remove manometer from pressure tap and replace pipe plug on gas valve. Turn on gas to unit and check for leaks.

Measure Manifold Pressure (Propane Units)

The main burner orifices on a propane gas unit are sized for the unit rated input when the manifold pressure reading matches the level specified in Table 3.

Proceed as follows to adjust gas input on a propane gas unit:

1. Turn off gas to unit.

2. Remove pipe plug on manifold and connect manometer (See Fig. 13).

3. Turn on gas to unit.

4. Remove cover screw over regulator adjustment screw on gas valve.

5. Adjust regulator adjustment screw to the correct manifold pressure, as specified in Table 3. Turn adjusting screw clockwise to increase manifold pressure, or turn adjusting screw counterclockwise to decrease manifold pressure.

6. Replace cover screw.

7. Turn off gas to unit. Remove manometer from pressure tap. Replace pipe plug on gas valve, then turn on gas to unit. Check for leaks.

CHECK BURNER FLAME

With burner access panel removed, observe the unit heating operation. Watch the burner flames to see if they are light blue and soft in appearance, and that the flames are approximately the same for each burner. Propane will have blue flame (See Fig. 14). Refer to the Maintenance section for information on burner removal.

AIRFLOW AND TEMPERATURE RISE

The heating section for each size unit is designed and approved for heating operation within the temperature--rise range stamped on the unit rating plate.

Table 8 shows the approved temperature rise range for each heating input, and the air delivery cfm at various temperature rises. The heating operation airflow must produce a temperature rise that falls within the approved range.

Refer to Indoor Airflow and Airflow Adjustments section to adjust heating airflow when required.

An LED (light--emitting diode) indicator is provided on the control board to monitor operation. The control board is located by removing the burner access panel. During normal operation, the LED is continuously on (See Table 4 for error codes).

Page 15

574D

Fig. 15 -- 208/230--1 --60 Wiring Diagram

A07230

Page 16

574D

Fig. 16 -- 208/230--3 --60 Wiring Diagram

A07232

Page 17

574D

Fig. 17 -- 460-- 3--60 Wiring Diagram

A07231

Page 18

Table 3 – Heating Inputs

NUMBER

MANIFOLD

PRESSURE

(IN.WC)

ORIFICES

HEATING INPUT

(BTUH)

40,000 2 4.0 13.0 4.0 13.0 3.5 3.5 60,000 2 4.0 13.0 4.0 13.0 3.5 3.5

90,000 3 4.0 13.0 4.0 13.0 3.5 3.4 115,000 3 4.0 13.0 4.0 13.0 3.5 3.7 130,000 3 4.0 13.0 4.0 13.0 3.5 3.5

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

{Based on altitudes from sea level to 2000 ft above sea level. For altitudes above 2000 ft, reduce input rating 4 percent for each additional 1000 ft above sea

level. In Canada, fr o m 2000 ft above sea level to 4500 ft above sea level, derate the unit 10 percent.

GAS SUPPLY PRESSURE (IN. WC)

Natural{ Propane*{

Min Max Min Max Natural{ Propane*†

HEATING SEQUENCE OF OPERATION

(See Fig. 15--17 and unit wiring label.) On a call for heating, terminal W of the thermostat is energized,

starting the induced--draft motor. When the hall--effect sensor on the induced-- draft motor senses that it has reached the required speed, the burner sequence begins. This function is performed by the integrated gas control (IGC). The indoor (evaporator)-- fan

574D

motor is energized 45 sec after flame is established. When the thermostat is satisfied and W is de--energized, the burners stop firing and the indoor (evaporator) fan motor shuts off after a 45--sec time--off delay.

LIMIT SWITCHES

Normally closed limit switch (LS) completes the control circuit. Should the leaving--air temperature rise above the maximum allowable temperature, the limit switch opens and the control circuit “breaks.” Any interruption in the control circuit instantly closes the gas valve and stops gas flow to the burners and pilot. The blower motor continues to run until LS resets.

When the air temperature at the limit switch drops to the low--temperature setting of the limit switch, the switch closes and completes the control circuit. The direct--spark ignition system cycles and the unit returns to normal heating operation.

Table 4 – LED Indications

ERROR CODE LED INDICATION

Normal Operation On

Hardware Failure Off

Fan On/Off Delay Modified 1Flash

Limit Switch Fault 2 Flashes Flame Sense Fault 3 Flashes

Four Consecutive Limit Switch Faults 4 Flashes

Ignition Lockout Fault 5 Flashes

Induced-- Draft Motor Fault 6 Flashes

Rollout Switch Fault 7 Flashes

Internal Control Fault 8 Flashes

Temporary Lock-- Out (1 hr) 9 Flashes

NOTES:

1. There is a 3 sec pause between error code displays.

2. If more than one error code exists, all applicable error codes will be displayed in numerical sequence.

3. This chart is on the wiring diagram located inside the burner access panel.

ROLLOUT SWITCH

The function of the rollout switch is to close the main gas valve in the event of flame rollout. The switch is located above the main burners. When the temperature at the rollout switch reaches the maximum allowable temperature, the control circuit trips, closing the gas valve and stopping gas flow to the burners. The indoor (evaporator) fan motor (IFM) and induced draft motor continue to run until switch is reset. The IGC LED will display FAULT CODE

Step 3 — Start--up Cooling and Make Adjustments

Complete the required procedures given in the Pre--Start--Up section before starting the unit. Do not jumper any safety devices when operating the unit. Do not operate the compressor when the outdoor temperature is below 40°F(4.4°C) (unless accessory low--ambient kit is installed). Do not rapid--cycle the compressor. Allow 5 minutes between on cycles to prevent compressor damage.

CHECKING COOLING CONTROL OPERATION

Start and check the unit for proper cooling control operation as follows:

1. Place room thermostat SYSTEM switch in OFF position. Observe that blower motor starts when FAN switch is placed in ON position and shuts down when FAN switch is placed in AUTO position.

2. Place SYSTEM switch in COOL position and FAN switch in AUTO position. Set cooling control below room temperature. Observe that compressor, condenser fan, and evaporator blower motors start. Observe that cooling cycle shuts down when control setting is satisfied. The evaporator fan will continue to run for 30 sec.

3. When using an auto--changeover room thermostat, place both SYSTEM and FAN switches in AUTO positions. Observe that unit operates in Heating mode when temperature control is set to call for heating (above room temperature) and operates in Cooling mode when temperature control is set to call for cooling (below room temperature).

IMPORTANT: Three--phase, scroll compressors are direction oriented. Unit must be checked to ensure proper compressor 3--phase power lead orientation. If not corrected within 5 minutes, the internal protector will shut off the compressor. The 3--phase power leads to the unit must be reversed to correct rotation. When turning backwards, the difference between compressor suction and discharge pressures will be minimal.

CHECKING AND ADJUSTING REFRIGERANT CHARGE

The refrigerant system is fully charged with PuronR (R--410A) refrigerant and is tested and factory sealed. Allow system to operate a minimum of 15 minutes before checking or adjusting charge.

NOTE: Adjustment of the refrigerant charge is not required unless the unit is suspected of not having the proper PuronR (R--410A)

charge.

The charging label and the tables shown refer to system temperatures and pressures in cooling mode only. A refrigerant charging label is attached to the outside of the service access door. The chart includes the required liquid line temperature at given discharge line pressures and outdoor ambient temperatures.

An accurate subcooling, thermocouple-- or thermistor--type thermometer, and a gauge manifold are required when using the subcooling charging method for evaluating the unit charge. Do not

Page 19

use mercury or small dial--type thermometers because they are not adequate for this type of measurement.

WARNING

UNIT DAMAGE HAZARD

Failure to follow this caution may result in unit damage.

When evaluating the refrigerant charge, an indicated adjustment to the specified factory charge must always be very minimal. If a substantial adjustment is indicated, an abnormal condition exists somewhere in the cooling system, such as insufficient airflow across either coil or both coils.

Proceed as follows:

1. Remove caps from low-- and high --pressure service fittings.

2. Using hoses with valve core depressors, attach low-- and high--pressure gauge hoses to low-- and high-- pressure service fittings, respectively.

3. Start unit in Cooling Mode and let unit run until system pressures stabilize.

4. Measure and record the following:

a. Outdoor ambient-- air temperature (°F(°C)db).

b. Liquid line temperature (°F(°C).

c. Discharge (high--side) pressure (psig).

5. Using “Cooling Charging Charts,” compare outdoor--air temperature(°F(°C) db) with the discharge line pressure (psig) to determine desired system operating liquid line temperature (See Table 6).

6. Compare actual liquid line temperature with desired liquid line temperature. Using a tolerance of ± 2°F(±1.1°C), add refrigerant if actual temperature is more than 2°F(±1.1°C) higher than proper liquid line temperature, or remove refrigerant if actual temperature is more than 2°F(±1.1°C) lower than required liquid line temperature.

NOTE: If the problem causing the inaccurate readings is a refrigerant leak, refer to the Check for Refrigerant Leaks section.

CAUTION

INDOOR AIRFLOW AND AIRFLOW ADJUST-

MENTS

CAUTION

UNIT OPERATION HAZARD

Failure to follow this caution may result in unit damage.

For cooling operation, the recommended airflow is 350 to 450 cfm for each 12,000 Btuh of rated cooling capacity. For heating operation, the airflow must produce a temperature rise that falls within the range stamped on the unit rating plate.

Table 8 shows the temperature rise in each heating mode. Refer to these tables to determine the desired heating airflow for the system being installed. (See Table 9 for wet coil pressure drop).

NOTE: Be sure that all supply--and return--air grilles are open, free from obstructions, and adjusted properly. Airflow can be changed using the User Interface.

ELECTRICAL SHOCK HAZARD

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

Disconnect electrical power to the unit and install lockout tag before changing blower speed.

Airflow can be changed by changing the lead connections of the blower motor.

All 574D units are factor wired for low speed except sizes 030 and 048 which are wired for medium speed.

FOR 208/230V

For color coding on the 208/230V motor leads, see Table 5.

Table 5 – Color Coding for 208/230V Motor Leads

BLACK = HIGH SPEED

Blue = Medium Speed

Red = Low Speed

To change the speed of the indoor fan motor (IFM), remove the fan motor speed leg lead from the blower relay (BR). This wire is attached to terminal blower motor (BM) of the integrated gas control (IGC) board for single--phase units. To change the speed, remove and replace with lead for desired blower motor speed. Insulate the removed lead to avoid contact with chassis parts.

COOLING SEQUENCE OF OPERATION

With the room thermostat SYSTEM switch in the COOL position and the FAN switch in the AUTO position, the cooling sequence of operation is as follows:

1. When the room temperature rises to a point that is slightly above the cooling control setting of the thermostat, the thermostat completes the circuit between thermostat terminal R to terminals Y and G.

2. The normally open contacts of energized contactor (C) close and complete the circuit through compressor motor (COMP) to condenser (outdoor) fan motor (OFM). Both motors start instantly.

3. The set of normally open contacts of energized relay BM close and complete the circuit through evaporator blower (indoor) fan motor (IFM).

NOTE: Once the compressor has started and then stopped, it should not be started again until 5 minutes have elapsed. The cooling cycle remains on until the room temperature drops to a point that is slightly below the cooling control setting of the room thermostat. At this point, the thermostat breaks the circuit between thermostat terminal R to terminals Y and G. These open circuits deenergize contactor coil C. The condenser and compressor motors stop. After a 30--sec. delay, the blower motor stops. The unit is in a standby condition, waiting for the next call for cooling from the room thermostat.

574D

Page 20

Required Subcooling oF (oC)

Model Size

1- Measure Discharge line pressure by attaching a gauge to the service port.

2- Measure the Liquid line temperature by attaching a temperature sensing device to it.

3- Insulate the temperature sensing device so that the Outdoor Ambient doesn’t affect the reading.

4- Refer to the required Subcooling in the table based on the model size and the Outdoor Ambient temperature.

5- Interpolate if the Outdoor ambient temperature lies in between the table values.

6- Find the Pressure Value in the table corresponding to the the measured Pressure of the Compressor Discharge line.

7- Read across from the Pressure reading to obtain the Liquid line temperature for a required Subcooling

8- Add Charge if the measured temperature is higher than the table value.

574D

9 - Remove charge if the measured temperature is lower than the table value.

75 (24) 85 (29) 95 (35) 105 (41) 115 (46)

018 13 (7.2) 14 (7.8) 15 (5.0) 16 (8.9) 16 (8.9) 024 10 (5.6) 11 (6.1) 11 (6.1) 12 (6.7) 13 (7.2) 030 12 (6.7) 13 (7.2) 14 (7.8) 15 (5.0) 15 (5.0) 036 14 (7.8) 14 (7.8) 14 (7.8) 14 (7.8) 14 (7.8) 042 11 (6.1) 11 (6.1) 11 (6.1) 10 (5.6) 9 (5.0) 048 8 (4.4) 7 (3.9) 7 (3.9) 7 (3.9) 6 (3.3) 060 14 (7.8) 13 (7.2) 12 (6.7) 11 (6.1) 10 (5.6)

Charging Procedure

50ES500006 REV 2.0

Outdoor Ambient Temperature

Table6–CoolingChargingChart

Required Liquid Line Temperature for a Specific Subcooling (R-410A)

Pressure

(psig)

189 66 61 56 51 46 41 1303 19 16 13 11 8 5 196 68 63 58 53 48 43 1351 20 17 15 12 9 6 203 71 66 61 56 51 46 1399 21 19 16 13 10 8 210 73 68 63 58 53 48 1448 23 20 17 14 11 9

217 75 70 65 60 55 50 1496 24 21 18 15 13 10 224 77 72 67 62 57 52 1544 25 22 19 16 14 11 231 79 74 69 64 59 54 1593 26 23 20 18 15 12 238 81 76 71 66 61 56 1641 27 24 21 19 16 13

245 82 77 72 67 62 57 1689 28 25 22 20 17 14 252 84 79 74 69 64 59 1737 29 26 23 21 18 15 260 86 81 76 71 66 61 1792 30 27 25 22 19 16 268 88 83 78 73 68 63 1848 31 29 26 23 20 17

276 90 85 80 75 70 65 1903 32 30 27 24 21 19 284 92 87 82 77 72 67 1958 33 31 28 25 22 20 292 94 89 84 79 74 69 2013 35 32 29 26 23 21 300 96 91 86 81 76 71 2068 36 33 30 27 24 22

309 98 93 88 83 78 73 2130 37 34 31 28 26 23 318 100 95 90 85 80 75 2192 38 35 32 29 27 24 327 102 97 92 87 82 77 2254 39 36 33 31 28 25 336 104 99 94 89 84 79 2316 40 37 34 32 29 26

345 106 101 96 91 86 81 2378 41 38 35 33 30 27 354 364 110 105 100 95 90 85 2509 43 40 38 35 32 29 374 112 107 102 97 92 87 2578 44 41 39 36 33 30

384 113 108 103 98 93 88 2647 45 42 40 37 34 31 394 115 110 105 100 95 90 2716 46 44 41 38 35 32 404 117 112 107 102 97 92 2785 47 45 42 39 36 33 414 119 114 109 104 99 94 2854 48 46 43 40 37 34

424 121 116 111 106 101 96 2923 49 47 44 41 38 35 434 123 118 113 108 103 98 2992 50 48 45 42 39 36 444 124 119 114 109 104 99 3061 51 48 46 43 40 37 454 126 121 116 111 106 101 3130 52 49 47 44 41 38

464 128 123 118 113 108 103 3199 53 50 48 45 42 39 474 129 124 119 114 109 104 3268 54 51 48 46 43 40 484 131 126 121 116 111 106 3337 55 52 49 47 44 41 494 132 127 122 117 112 107 3406 56 53 50 47 45 42

504 134 129 124 119 114 109 3475 57 54 51 48 46 43 514 136 131 126 121 116 111 3544 58 55 52 49 46 44 524 137 132 127 122 117 112 3612 58 56 53 50 47 45 534 139 134 129 124 119 114 3681 59 56 54 51 48 45

5 10152025

108 103 98 93 88 83 2440 42 39 36 34 31 28

Pressure

(kPa)

Required Subcooling (

3 6 8 11 14

C)Required Subcooling (oF)

Table 7 – Filter Pressure Drop Table (in. wc)

FILTER SIZE

500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300

20X20X1 0.05 0.07 0.08 0.1 0.12 0.13 0.14 0.15 — — — — — — — — — — — 24X30X1 — — — 0.04 0.05 0.06 0.07 0.07 0.08 0.09 0.1 — — — — — — — — 24X36X1 — — — — — — — 0.06 0.07 0.07 0.08 0.09 0.09 0.10 0.11 0.12 0.13 0.14 0.14

CFM

Table 8 – Dry Coil Air Delivery* -- Horizontal and Downflow Discharge --

Unit 574D024--060 (Deduct 10% for 208 Volts)

Unit

574D018040

574D024040

Heating Rise

Range

F(°C)

30 --- 60

( 1 7 --- 33 )

20 --- 50

( 1 1 --- 28 )

Motor

Speed

Low

High

Low

Medium

High

Watts 260 243 229 217 209 --- --- --- --- --- --- --- ---

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9

CFM 859 775 667 536 382 --- --- --- --- --- --- --- ---

Heating RiseoF

°C

Watts 340 328 317 307 300 294 --- --- --- --- --- ---

CFM 1064 948 820 680 528 364 --- --- --- --- --- ---

Heating RiseoF

°C

Watts 311 309 304 301 286 290 286 280 --- ---

CFM 935 885 820 757 686 583 423 263 --- ---

Heating RiseoF

°C

Watts 411 405 398 390 379 357 357 345 327

CFM 1195 1155 1100 1028 957 868 769 647 365

Heating RiseoF

°C

Watts 528 518 509 492 477 467 447 435 421

CFM 1484 1421 1368 1279 1185 1088 970 853 712

Heating RiseoF

°C

35 19

32 18

25 14

20 11

39 22

32 18

34 19

26 14

21 12

External Static Pressure (in. wc)

37 20

27 15

22 12

NA NA NA NA NA

40 22

29 16

23 13

NA NA NA NA

352042

Page 21

Unit

574D024060

574D030040

574D030060

574D036060

574D036090

574D042060

574D042090

Table 8 Con’t—Dry Coil Air Delivery* -- Horizontal and Downflow Discharge --

Unit 574D024--060 (Deduct 10% for 208 Volts)

Heating Rise

F(°C)

Range

35 --- 65

( 1 9 --- 36 )

20 --- 50

( 1 1 --- 28 )

35 --- 65

( 1 9 --- 36 )

25 --- 55

( 1 4 --- 31 )

40 --- 70

( 2 2 --- 39 )

25 --- 55

( 1 4 --- 31 )

40 --- 70

( 2 2 --- 39 )

Motor

Speed

Low

Medium

High

Low

Medium

High

Low

Medium

High

Low

Medium

High

Low

Medium

High

Low

Medium

High

Low

Medium

High

Watts 311 309 304 301 286 290 286 280 --- ---

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9

CFM 935 885 820 757 686 583 423 263 --- ---

Heating RiseoF

°C

Watts 411 405 398 390 379 357 357 345 327

CFM 1195 1155 1100 1028 957 868 769 647 365

Heating RiseoF

°C

Watts 528 518 509 492 477 467 447 435 421

CFM 1484 1421 1368 1279 1185 1088 970 853 712

Heating RiseoF

°C

Watts 311 309 304 301 286 290 286 280 --- ---

CFM 935 885 820 757 686 583 423 263 --- ---

Heating RiseoF

°C

Watts 411 405 398 390 379 357 357 345 327

CFM 1195 1155 1100 1028 957 868 769 647 365

Heating RiseoF

°C

Watts 528 518 509 492 477 467 447 435 421

CFM 1484 1421 1368 1279 1185 1088 970 853 712

Heating RiseoF

°C

Watts 311 309 304 301 286 290 286 280 --- ---

CFM 935 885 820 757 686 583 423 263 --- ---

Heating RiseoF

°C

Watts 411 405 398 390 379 357 357 345 327

CFM 1195 1155 1100 1028 957 868 769 647 365

Heating RiseoF

°C

Watts 528 518 509 492 477 467 447 435 421

CFM 1484 1421 1368 1279 1185 1088 970 853 712

Heating RiseoF

°C

Watts 439 429 415 401 395 380 356 339 329

CFM 1242 1170 1089 994 917 837 702 570 442

Heating RiseoF

°C

Watts 503 491 479 461 450 436 418 404 389

CFM 1320 1244 1162 1081 1005 897 767 662 541

Heating RiseoF

°C

Watts 641 627 623 609 601 588 571 559 548

CFM 1362 1288 1205 1119 1033 933 826 714 580

Heating RiseoF

°C

Watts 439 429 415 401 395 380 356 339 329

CFM 1242 1170 1089 994 917 837 702 570 442

Heating RiseoF

°C

Watts 503 491 479 461 450 436 418 404 389

CFM 1320 1244 1162 1081 1005 897 767 662 541

Heating RiseoF

°C

Watts 641 627 623 609 601 588 571 559 548

CFM 1362 1288 1205 1119 1033 933 826 714 580

Heating RiseoF

°C

Watts 559 540 522 503 483 464 445 425 406

CFM 1405 1370 1330 1283 1230 1171 1106 1034 957

Heating RiseoF

°C

Watts 665 647 629 609 589 567 545 521 497

CFM 1593 1552 1505 1452 1394 1330 1260 1184 1102

Heating RiseoF

°C

Watts 815 795 775 754 734 715 695 676 656

CFM 1764 1710 1652 1591 1525 1456 1383 1306 1225

Heating RiseoF

°C

Watts 559 540 522 503 483 464 445 425 406

CFM 1405 1370 1330 1283 1230 1171 1106 1034 957

Heating RiseoF

°C

Watts 665 647 629 609 589 567 545 521 497

CFM 1593 1552 1505 1452 1394 1330 1260 1184 1102

Heating RiseoF

°C

Watts 815 795 775 754 734 715 695 676 656

CFM 1764 1710 1652 1591 1525 1456 1383 1306 1225

Heating RiseoF

°C

NA NA NA

NA NA

External Static Pressure (in. wc)

35 20

NA NA NA NA NA

NA NA NA NA

46 26

39 22

31 17

NA NA

532963

352042

NA NA NA NA NA

NA NA

532963

NA NA NA

NA NA

NA NA NA NA NA

NA NA NA NA

442447

36 20

33 18

61 34

54 30

49 27

382141

341937

65 36

573261

522955

574D

Page 22

Table 8 Con’t—Dry Coil Air Delivery* -- Horizontal and Downflow Discharge --

Unit 574D024--060 (Deduct 10% for 208 Volts)

Unit

574D048090

574D048115

Heating Rise

F(°C)

Range

25 --- 55

( 1 4 --- 31 )

35 --- 65

( 1 9 --- 36 )

574D

574D048130

574D060090

574D060115

574D060130

* Air delivery values are without air filter and are for dry coil (See Table 15 -- 574D Wet Coil Pressure Drop table).

Factory--shipped heating/cooling speed

40 --- 70

( 2 2 --- 39 )

25 --- 55

( 1 4 --- 31 )

35 --- 65

( 1 9 --- 36 )

40 --- 70

( 2 2 --- 39 )

Motor

Speed

Low

Medium

High

Low

Medium

High

Low

Medium

High

Low

Medium

High

Low

Medium

High

Low

Medium

High

Watts 627 617 607 584 567 548 528 503 480

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9

CFM 1550 1530 1493 1461 1414 1361 1320 1250 1177

Heating RiseoF

°C

Watts 771 755 734 711 690 665 639 607 572

CFM 1798 1771 1734 1687 1645 1595 1530 1449 1355

Heating RiseoF

°C

Watts 969 941 908 887 858 827 804 767 748

CFM 2124 2071 2000 1944 1876 1811 1735 1647 1555

Heating RiseoF

°C

Watts 627 617 607 584 567 548 528 503 480

CFM 1550 1530 1493 1461 1414 1361 1320 1250 1177

Heating RiseoF

°C

Watts 771 755 734 711 690 665 639 607 572

CFM 1798 1771 1734 1687 1645 1595 1530 1449 1355

Heating RiseoF

°C

Watts 969 941 908 887 858 827 804 767 748

CFM 2124 2071 2000 1944 1876 1811 1735 1647 1555

Heating RiseoF

°C

Watts 627 617 607 584 567 548 528 503 480

CFM 1550 1530 1493 1461 1414 1361 1320 1250 1177

Heating RiseoF

°C

Watts 771 755 734 711 690 665 639 607 572

CFM 1798 1771 1734 1687 1645 1595 1530 1449 1355

Heating RiseoF

°C

Watts 969 941 908 887 858 827 804 767 748

CFM 2124 2071 2000 1944 1876 1811 1735 1647 1555

Heating RiseoF

°C

Watts 786 769 754 736 722 705 684 658 616

CFM 2027 1960 1901 1821 1759 1693 1616 1513 1354

Heating RiseoF

°C

Watts 873 849 833 815 798 782 763 748 704

CFM 2095 2026 1962 1887 1817 1748 1679 1583 1439

Heating RiseoF

°C

Watts 1012 993 981 963 948 927 904 886 846

CFM 2184 2109 2036 1963 1886 1812 1729 1647 1496

Heating RiseoF

°C

Watts 786 769 754 736 722 705 684 658 616

CFM 2027 1960 1901 1821 1759 1693 1616 1513 1354

Heating RiseoF

°C

Watts 873 849 833 815 798 782 763 748 704

CFM 2095 2026 1962 1887 1817 1748 1679 1583 1439

Heating RiseoF

°C

Watts 1012 993 981 963 948 927 904 886 846

CFM 2184 2109 2036 1963 1886 1812 1729 1647 1496

Heating RiseoF

°C

Watts 786 769 754 736 722 705 684 658 616

CFM 2027 1960 1901 1821 1759 1693 1616 1513 1354

Heating RiseoF

°C

Watts 873 849 833 815 798 782 763 748 704

CFM 2095 2026 1962 1887 1817 1748 1679 1583 1439

Heating RiseoF

°C

Watts 1012 993 981 963 948 927 904 886 846

CFM 2184 2109 2036 1963 1886 1812 1729 1647 1496

Heating RiseoF

°C

NA = Not allowed for heating speed Note: Deduct field--supplied air filter pressure drop and wet coil pressure drop to obtain external static pressure available for ducting.

External Static Pressure (in. wc)

41 23

36 20

61 34

52 29

46 26

69 38

59 33

52 29

38 21

37 21

36 20

49 27

47 26

46 25

55 31

54 30

52 29

NA NA NA NA

472650

412343

NA NA

603364

522955

593363

452550

432447

412345

573264

543060

522958

623468

593365

Page 23

Table 9 – 574D Wet Coil Pressure Drop

UNIT

SIZE

018 0.011 0.013 0.018 0.022 -- -- -- -- -- -- -- -- -- -- -- -024 -- 0.030 0.037 0.044 0.053 0.063 -- -- -- -- -- -- -- -- -- -030 -- -- 0.037 0.044 0.053 0.063 0.072 0.081 0.105 -- -- -- -- -- -- -036 -- -- -- -- 0.05 0.061 0.072 0.080 0.090 0.110 -- -- -- -- -- -042 -- -- -- -- -- 0.044 0.051 0.059 0.065 0.072 0.080 0.088 0.095 0.105 -- -048 -- -- -- -- -- -- -- 0.044 0.050 0.053 0.059 0.066 0.072 0.077 0.086 -060 -- -- -- -- -- -- -- -- -- -- 0.079 0.087 0.095 0.102 0.113 0.123

500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000

STANDARD CFM (S.C.F.M.)

MAINTENANCE

To ensure continuing high performance and to minimize the possibility of premature equipment failure, periodic maintenance must be performed on this equipment. This unit should be inspected at least once each year by a qualified service person. To troubleshoot unit, refer to Table 10, Troubleshooting Chart.

NOTE TO EQUIPMENT OWNER: Consult your local dealer about the availability of a maintenance contract.

WARNING

PERSONAL INJURY AND UNIT DAMAGE HAZARD

Failure to follow this warning could result in personal injury or death and unit component damage.

The ability to properly perform maintenance on this equipment requires certain expertise, mechanical skills, tools and equipment. If you do not possess these, do not attempt to perform any maintenance on this equipment, other than those procedures recommended in the Owner’s Manual.

WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow these warnings could result in personal injury or death:

1. Turn off electrical power to the unit before performing any maintenance or service on this unit.

2. Use extreme caution when removing panels and parts.

3. Never place anything combustible either on or in contact with the unit.

CAU-

3. Inspect blower motor and wheel for cleanliness at the beginning of each heating and cooling season. Clean when necessary. For first heating and cooling season, inspect blower wheel bi-- monthly to determine proper cleaning frequency.

4. Check electrical connections for tightness and controls for proper operation each heating and cooling season. Service when necessary.

5. Ensure electric wires are not in contact with refrigerant tubing or sharp metal edges.

6. Check and inspect heating section before each heating season. Clean and adjust when necessary.

7. Check flue hood and remove any obstructions, if necessary.

AIR FILTER

IMPORTANT: Never operate the unit without a suitable air filter

in the return--air duct system. Always replace the filter with the same dimensional size and type as originally installed. See Table 1 for recommended filter sizes.

Inspect air filter(s) at least once each month and replace (throwaway-- type) or clean (cleanable--type) at least twice during each cooling season and twice during the heating season, or whenever the filter becomes clogged with dust and lint.

INDOOR BLOWER AND MOTOR

NOTE: All motors are pre--lubricated. Do not attempt to lubricate

these motors.

For longer life, operating economy, and continuing efficiency, clean accumulated dirt and grease from the blower wheel and motor annually.

WARNING

ELECTRICAL SHOCK HAZARD

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

Disconnect and tag electrical power to the unit before cleaning and lubricating the blower motor and wheel.

574D

UNIT OPERATION HAZARD

Failure to follow this caution may result in improper operation.

Errors made when reconnecting wires may cause improper and dangerous operation. Label all wires prior to disconnecting when servicing.

The minimum maintenance requirements for this equipment are as follows:

1. Inspect air filter(s) each month. Clean or replace when necessary.

2. Inspect indoor coil, drain pan, and condensate drain each cooling season for cleanliness. Clean when necessary.

TION

To clean the blower motor and wheel:

1. Remove and disassemble blower assembly as follows:

a. Remove unit access panel.

b. Disconnect motor lead from blower relay (BM).

Disconnect yellow lead from terminal L2 of the contactor.

c. On all units remove blower assembly from unit.

Remove screws securing blower to blower partition and slide assembly out. Be careful not to tear insulation in blower compartment.

d. Ensure proper reassembly by marking blower wheel and

motor in relation to blower housing before disassembly.

e. Loosen setscrew(s) that secures wheel to motor shaft,

remove screws that secure motor mount brackets to

Page 24

housing, and slide motor and motor mount out of housing.

2. Remove and clean blower wheel as follows:

a. Ensure proper reassembly by marking wheel orientation.

b. Lift wheel from housing. When handling and/or

cleaning blower wheel, be sure not to disturb balance weights (clips) on blower wheel vanes.

c. Remove caked--on dirt from wheel and housing with a

brush. Remove lint and/or dirt accumulations from wheel and housing with vacuum cleaner, using soft brush attachment. Remove grease and oil with mild solvent.

d. Reassemble wheel into housing.

e. Reassemble motor into housing. Be sure setscrews are

tightened on motor shaft flats and not on round part of shaft.

f. Reinstall unit access panel.

3. Restore electrical power to unit. Start unit and check for

574D

proper blower rotation and motor speeds during heating and cooling cycles.

FLUE GAS PASSAGEWAYS

To inspect the flue collector box and upper areas of the heat exchanger:

1. Remove the combustion blower wheel and motor assembly according to directions in the Combustion--Air Blower section.

2. Remove the 3 screws holding the blower housing to the flue collector box cover (See Fig. 1 8 --21).

3. Remove the 12 screws holding the flue collector box cover (See Fig. 20--21) to the heat exchanger assembly. Inspect the heat exchangers.

4. Clean all surfaces, as required, using a wire brush.

INDUCED DRAFT (COMBUSTION AIR) BLOWER

Clean periodically to assure proper airflow and heating efficiency. Inspect blower wheel every fall and periodically during the heating season. For the first heating season, inspect blower wheel bimonthly to determine proper cleaning frequency.

To inspect blower wheel, remove draft hood assembly. Shine a flashlight into opening to inspect wheel. If cleaning is required, remove motor and wheel as follows:

1. Remove unit access panel (See Fig. 19).

2. Remove the 7 screws that attach induced--draft motor mounting plate to blower housing (See Fig. 20).

3. Slide the motor and blower wheel assembly out of the blower housing (See Fig. 20). Clean the blower wheel. If additional cleaning is required, continue with Steps 4 and 5.

4. To remove blower, remove 2 setscrews.

5. To remove motor and cooling fan assembly, remove 4 screws that hold blower housing to mounting plate.

6. To reinstall, reverse the procedure outlined above.

LIMIT SWITCH

Remove unit access panel. Limit switch is located on the blower partition.

BURNER IGNITION

Unit is equipped with a direct spark ignition 100 percent lockout system. Ignition module is located in the control box (See Fig.

18).Module contains a self--diagnostic LED. During servicing, refer to label diagram for LED interpretation.

If lockout occurs, unit may be reset by either momentarily interrupting power supply to unit or by turning selector switch to OFF position at the thermostat.

MAIN BURNERS

At the beginning of each heating season, inspect for deterioration or blockage due to corrosion or other causes. Observe the main burner flames and adjust, if necessary.

Removal of Gas T To remove the gas train for servicing:

1. Shut off main gas valve.

2. Shut off power to unit and install lockout tag.

3. Remove unit access panel (See Fig. 19).

4. Disconnect gas piping at unit gas valve.

5. Remove wires connected to gas valve. Mark each wire.

6. Remove ignitor and sensor wires at the ignitor module.

7. Remove the mounting screw that attaches the burner rack to the unit base (See Fig. 18).

8. Slide the burner rack out of the unit (See Fig. 18 and 21).

9. To reinstall, reverse the procedure outlined above.

rain

OUTDOOR COIL, INDOOR COIL, AND CONDENSA TE DRAIN P

Inspect the condenser coil, evaporator coil, and condensate drain pan at least once each year.

The coils are easily cleaned when dry; therefore, inspect and clean the coils either before or after each cooling season. Remove all obstructions, including weeds and shrubs, that interfere with the airflow through the condenser coil.

Straighten bent fins with a fin comb. If coated with dirt or lint, clean the coils with a vacuum cleaner, using the soft brush attachment. Be careful not to bend the fins. If coated with oil or grease, clean the coils with a mild detergent and water solution. Rinse coils with clear water, using a garden hose. Be careful not to splash water on motors, insulation, wiring, or air filter(s). For best results, spray condenser coil fins from inside to outside the unit. On units with an outer and inner condenser coil, be sure to clean between the coils. Be sure to flush all dirt and debris from the unit base.

Inspect the drain pan and condensate drain line when inspecting the coils. Clean the drain pan and condensate drain by removing all foreign matter from the pan. Flush the pan and drain trough with clear water. Do not splash water on the insulation, motor, wiring, or air filter(s). If the drain trough is restricted, clear it with a “plumbers snake” or similar probe device.

Page 25

IGNITION MODULE

FLUE COLLECTOR BOX

INDUCED DRAFT MOTOR MOUNT

BLOWER HOUSING

BURNER RACK

MOUNTING SCREW

ROLLOU SWITCH

Fig. 18 -- Blower Housing and Flue Collector Box

A05119

Fig. 21 -- Burner Rack Removed

OUTDOOR FAN

CAUTION

UNIT OPERATION HAZARD

Failure to follow this caution may result in damage to unit components.

Keep the condenser fan free from all obstructions to ensure proper cooling operation. Never place articles on top of the unit.

C99086

574D

Front

ccess Panel

Fig. 19 -- Unit Access Panel

Fig. 20 -- Removal of Motor and Blower Wheel

A07151

BLOWER HOUSING

2 SETSCREWS (HIDDEN)

C99085

1. Remove 6 screws holding outdoor grille and motor to top cover.

2. Turn motor/grille assembly upside down on top cover to expose fan blade.

3. Inspect the fan blades for cracks or bends.

4. If fan needs to be removed, loosen setscrew and slide fan off motor shaft.

5. When replacing fan blade, position blade so that the hub is 1/8 in. away from the motor end (1/8 in. (3.175mm) of motor shaft will be visible) (See Fig. 12).

6. Ensure that setscrew engages the flat area on the motor shaft when tightening.

7. Replace grille.

ELECTRICAL CONTROLS AND WIRING

Inspect and check the electrical controls and wiring annually. Be sure to turn off the electrical power to the unit.

Remove access panel to locate all the electrical controls and wiring. Check all electrical connections for tightness. Tighten all screw connections. If any smoky or burned connections are noticed, disassemble the connection, clean all the parts, re--strip the wire end and reassemble the connection properly and securely.

After inspecting the electrical controls and wiring, replace all the panels. Start the unit, and observe at least one complete cooling cycle to ensure proper operation. If discrepancies are observed in operating cycle, or if a suspected malfunction has occurred, check each electrical component with the proper electrical instrumentation. Refer to the unit wiring label when making these checks.

Page 26

REFRIGERANT CIRCUIT

Annually inspect all refrigerant tubing connections and the unit base for oil accumulations. Detecting oil generally indicates a refrigerant leak.

WARNING

EXPLOSION, PERSONAL INJURY HAZARD

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

System under pressure. Relieve pressure and recover all refrigerant before system repair or final unit disposal. Use all service ports and open all flow--control devices, including solenoid valves.

If oil is detected or if low cooling performance is suspected, leak--test all refrigerant tubing using an electronic leak-- detector, halide torch, or liquid--soap solution. If a refrigerant leak is

574D

detected, refer to the Check for Refrigerant Leaks section. If no refrigerant leaks are found and low cooling performance is

suspected, refer to the Checking and Adjusting Refrigerant Charge section.

GAS INPUT

The gas input does not require checking unless improper heating performance is suspected. If a problem exists, refer to the Start--Up section.

EVAPORATOR AIRFLOW

The heating and/or cooling airflow does not require checking unless improper performance is suspected. If a problem exists, be sure that all supply-- and return--air grilles are open and free from obstructions, and that the air filter is clean. When necessary, refer to the Indoor Airflow and Airflow Adjustments section to check the system airflow.

PURON ITEMS METERING DEVICE

(Thermostatic Expansion Valve

)

This metering device is a hard shutoff, balance port TXV. The TXV maintains a constant superheat at the evaporator exit resulting in higher overall system efficiency.

PRESSURE SWITCHES

Pressure switches are protective devices wired into control circuit (low voltage). They shut off compressor if abnormally high or low pressures are present in the refrigeration circuit. These pressure switches are specifically designed to operate with Puron (R--410A) systems. R--22 pressure switches must not be used as replacements for the Puron (R--410A) system.

LOSS OF CHARGE SWITCH

This switch is located on the liquid line and protects against low suction pressures caused by such events as loss of charge, low airflow across indoor coil, dirty filters, etc. It opens on a pressure drop at about 20 psig. If system pressure is above this, switch should be closed. To check switch:

1. Turn off all power to unit.

2. Disconnect leads on switch.

3. Apply ohm meter leads across switch. You should have continuity on a good switch.

NOTE: Because these switches are attached to refrigeration system under pressure, it is not advisable to remove this device for troubleshooting unless you are reasonably certain that a problem exists. If switch must be removed, remove and recover all system charge so that pressure gauges read 0 psi. Never open system without breaking vacuum with dry nitrogen.

HIGH--PRESSURE SWITCH

The high--pressure switch is located in the discharge line and protects against excessive condenser coil pressure. It opens at 650 psig.

High pressure may be caused by a dirty outdoor coil, failed fan motor, or outdoor air recirculation. To check switch:

1. Turn off all power to unit.

2. Disconnect leads on switch.

3. Apply ohm meter leads across switch. You should have continuity on a good switch.

COPELAND SCROLL COMPRESSOR (PURON REFRIGERANT)

The compressor used in this product is specifically designed to operate with Puron (R--410A) refrigerant and cannot be interchanged.

The compressor is an electrical (as well as mechanical) device. Exercise extreme caution when working near compressors. Power should be shut off, if possible, for most troubleshooting techniques. Refrigerants present additional safety hazards.

WARNING

FIRE/EXPLOSION HAZARD

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

Wear safety glasses and gloves when handling refrigerants. Keep torches and other ignition sources away from refrigerants and oils.

The scroll compressor pumps refrigerant throughout the system by the interaction of a stationary and an orbiting scroll. The scroll compressor has no dynamic suction or discharge valves, and it is more tolerant of stresses caused by debris, liquid slugging, and flooded starts. The compressor is equipped with an anti-- rotational device and an internal pressure relief port. The anti--rotational device prevents the scroll from turning backwards and replaces the need for a cycle protector. The pressure relief port is a safety device, designed to protect against extreme high pressure. The relief port has an operating range between 550 (26.34 kPa) and 625 psi (29.93 kPa) differential pressure.

The Copeland scroll compressor uses Mobil 3MAF POE oil. Copeland Ultra 22 CC should be used if additional oil is needed in the field. Mobil Arctic EAL22CC or ICI Emkarate RL22 or 32CF oil may be used to recharge these compressors if Ultra 22 is not available.

WARNING

UNIT OPERATION AND SAFETY HAZARD

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

This system uses Puron (R--410A) refrigerant which has higher operating pressures than R--22 and other refrigerants. No other refrigerant may be used in this system. Gauge set, hoses, and recovery system must be designed to handle Puron. If you are unsure, consult the equipment manufacturer.

REFRIGERANT SYSTEM

This information covers the refrigerant system of the 574D, including the compressor oil needed, servicing systems on roofs containing synthetic materials, the filter drier and refrigerant charging.

Page 27

Compressor Oil

The compressor in this system uses a polyolester (POE) oil, Mobil 3MAF POE. This oil is extremely hygroscopic, meaning it absorbs water readily. POE oils can absorb 15 times as much water as other oils designed for HCFC and CFC refrigerants. Take all necessary precautions to avoid exposure of the oil to the atmosphere.

SERVICING SYSTEMS ON ROOFS WITH SYNTHETICMA

POE (polyolester) compressor lubricants are known to cause long term damage to some synthetic roofing materials.

Exposure, even if immediately cleaned up, may cause embrittlement (leading to cracking) to occur in one year or more. When performing any service that may risk exposure of compressor oil to the roof, take appropriate precautions to protect roofing. Procedures which risk oil leakage include, but are not limited to, compressor replacement, repairing refrigerant leaks, replacing refrigerant components such as filter drier, pressure switch, metering device, coil, accumulator, or reversing valve.

TERIALS

Synthetic Roof Precautionary Procedure

1. Cover extended roof working area with an impermeable polyethylene (plastic) drip cloth or tarp. Cover an approximate 10 X 10 ft. area.

2. Cover area in front of the unit service panel with a terry cloth shop towel to absorb lubricant spills and prevent run--offs, and protect drop cloth from tears caused by tools or components.

3. Place terry cloth shop towel inside unit immediately under component(s) to be serviced and prevent lubricant run--offs through the louvered openings in the unit base.

4. Perform required service.

5. Remove and dispose of any oil contaminated material per local codes.

LIQUID LINE FILTER DRIER

This filter drier is specifically designed to operate with Puron. Use only factory-- authorized components. Filter drier must be replaced whenever the refrigerant system is opened. When removing a filter drier, use a tubing cutter to cut the drier from the system. Do not unsweat a filter drier from the system. Heat from unsweating will release moisture and contaminants from drier into system.

PURON (R--410A) REFRIGERANT CHARGING

Refer to unit information plate and charging chart. Some R--410A refrigerant cylinders contain a dip tube to allow liquid refrigerant to flow from cylinder in upright position. For cylinders equipped with a dip tube, charge Puron units with cylinder in upright position and a commercial metering device in manifold hose. Charge refrigerant into suction--line.

TROUBLESHOOTING

Use the Troubleshooting Guides (See Tables 10-- 12) if problems occur with these units.

START--UP CHECKLIST

Use Start--Up checklist to ensure proper start--up procedures are followed.

574D

Page 28

PURONR (R--410A) QUICK REFERENCE GUIDE

S Puron refrigerant operates at 50-- 70 percent higher pressures than R--22. Be sure that servicing equipment and replacement

components are designed to operate with Puron

S Puron refrigerant cylinders are rose colored. S Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400. S Puron systems should be charged with liquid refrigerant. Use a commercial type metering device in the manifold hose when charging

into suction line with compressor operating

S Manifold sets should be 700 psig high side and 180 psig low side with 550 psig low--side retard. S Use hoses with 700 psig service pressure rating. S Leak detectors should be designed to detect HFC refrigerant. S Puron, as with other HFCs, is only compatible with POE oils. S Vacuum pumps will not remove moisture from oil. S Do not use liquid--line filter driers with rated working pressures less than 600 psig. S Do not leave Puron suction line filter driers in line longer than 72 hrs.

574D

S Do not install a suction--line filter drier in liquid line. S POE oils absorb moisture rapidly. Do not expose oil to atmosphere. S POE oils may cause damage to certain plastics and roofing materials. S Wrap all filter driers and service valves with wet cloth when brazing.

S A factory approved liquid--line filter drier is required on every unit. S Do NOT use an R--22 TXV. S If indoor unit is equipped with an R--22 TXV or piston metering device, it must be changed to a hard shutoff Puron TXV. S Never open system to atmosphere while it is under a vacuum. S When system must be opened for service, recover refrigerant, evacuate then break vacuum with dry nitrogen and replace filter driers.

Evacuate to 500 microns prior to recharging.

S Do not vent Puron into the atmosphere. S Do not use capillary tube coils. S Observe all warnings, cautions,andbold text. S All indoor coils must be installed with a hard shutoff Puron TXV metering device.

Page 29

SYMPTOM CAUSE REMEDY

Compressor and condenser fan will not start.

Compressor will not start but condenser fan runs

Three--phase scroll compressor makes excessive noise, and there may be a

low pressure differential.

Compressor cycles (other than normally satisfying UI)

Compressor operates continuously

Excessive head pressure

Head pressure too low

Excessive suction pressure

Suction pressure too low

Table 10 – Troubleshooting Chart

Power failure Call power company Fuse blown or circuit breaker tripped Replace fuse or reset circuit breaker Defective contactor, transformer, or high--pressure,

loss--of--charge or low--pressure switch Insufficient line voltage Determine cause and correct Incorrect or faulty wiring Check wiring diagram and rewire correctly

UI setting too high

Faulty wiring or loose connections in compressor circuit

Compressor motor burned out, seized, or Determine cause internal overload open Replace compressor Defective run/start capacitor, overload, start relay Determine cause and replace

One leg of 3--phase power dead

Low input voltage (20% low) Determine cause and correct

Scroll compressor is rotating in the wrong direction

Refrigerant overcharge or undercharge

Defective compressor Replace and determine cause Insufficient line voltage Determine cause and correct Blocked outdoor coil Determine cause and correct Defective run/start capacitor Determine cause and replace Faulty outdoor fan motor or capacitor Replace Restriction in refrigerant system Locate restriction and remove Dirty air filter Replace filter Unit undersized for load Decrease load or increase unit size UI temperature set too low Reset UI Low refrigerant charge Locate leak, repair, and recharge

Air in system

Outdoor coil dirty or restricted Clean coil or remove restriction Dirty air filter Replace filter Dirty condenser coil Clean coil Refrigerant overcharged Recover excess refrigerant

Air in system

Condenser air restricted or air short--cycling Determine cause and correct Low refrigerant charge Check for leaks, repair, and recharge.

Restriction in liquid tube Remove restriction

High heat load Check for source and eliminate Compressor valves leaking Replace compressor Refrigerant overcharged Recover excess refrigerant

Dirty air filter Replace filter

Low refrigerant charge Check for leaks, repair and recharge

Metering device or low side restricted Remove source of restriction

Insufficient evaporator airflow

Temperature too low in conditioned area Reset UI

Outdoor ambient below 55°F Install low--ambient kit

Filter drier restricted Replace filter

Replace component

Lower UI temperature setting below room temperature

Check wiring and repair or replace

Replace fuse or reset circuit breaker Determine cause

Correct the direction of rotation by reversing the 3--phase power leads to the unit. Shut down unit

to allow pressures to equalize. Recover refrigerant, evacuate system, and re-

charge to capacities shown on rating plate

Recover refrigerant, evacuate system, and recharge

Increase air quantity Check filter–replace if necessary

574D

Page 30

Table 11 – Troubleshooting Guide–Heating

SYMPTOM CAUSE REMEDY

Burners will not ignite

Inadequate heating

574D

Poor flame characteristics

Water in gas line Drain. Install drip leg. No power to furnace Check power supply fuses, wiring or circuit breaker.

No 20--v power supply to control circuit

Mis--wired or loose connections Check all wiring and wire nut connections

Misaligned spark electrodes

No gas at main burners

Dirty air filter Clean or replace filter as necessary Gas input to furnace too low Check gas pressure at manifold match with that on unit nameplate Unit undersized for application Replace with proper unit or add additional unit Restricted airflow Clean or replace filter. Remove any restriction.

Limit switch cycles main burners

Incomplete combustion results in: Aldehyde odors, carbon monoxide, sooting flame, floating flame

Check transformer. NOTE: Some transformers have internal over--current protection that requires a cool--down period to reset.

Check flame ignition and sense electrode positioning. Adjust as necessary.

1. Check gas line for air. Purge as necessary. NOTE: After purging gas line of air, wait at least 5 minutes for any gas to dissipate before attempting to light unit.

2. Check gas valve.

Check rotation of blower, temperature rise of unit. Adjust as necessary.

1. Tighten all screws around burner compartment

2. Cracked heat exchanger. Replace.

3. Unit over--fired. Reduce input (change orifices or adjust gas line or manifold pressure).

4. Check burner alignment.

5. Inspect heat exchanger for blockage. Clean as necessary.

Table 12 – Troubleshooting Guide–LED Error Codes

SYMPTOM CAUSE REMEDY

Hardware failure (LED OFF)

Fan ON/OFF delay modified (LED/FLASH)

Limit switch faults (LED 2 flashes)

Flame sense fault (LED 3 flashes)

4 consecutive limit switch faults (LED 4 flashes)

Ignition lockout (LED 5 flashes)

Induced--draft motor fault (LED 6 flashes)

Rollout switch fault (LED 7 flashes)

Internal control fault (LED 8 flashes)

Temporary software lockout (LED 9 flashes)

*WARNING : If the IGC must be replaced, be sure to ground yourself to dissipate any electrical charge that my be present before handling new control board. The IGC is sensitive to static electricity and my be damaged if the necessary precautions are not taken.

IMPORTANT: Refer to Table 11---Troubleshooting Guide ---Heating for additional troubleshooting analysis. LEGEND

IGC—Integrated Gas Unit Controller LED—Light---Emitting Diode

Loss of power to control module (IGC)*.

High limit switch opens during heat exchanger warm-up period before fan--on delay expires. Limit switch opens within three minutes after blower--off delay timing in heating mode.

High temperature limit switch is open.

The IGC* sensed flame that should not be present. Reset unit. If problem persists, replace control board.

Inadequate airflow to unit.

Unit unsuccessfully attempted ignition for 15 minutes.

IGC does not sense that induced--draft motor is operating.*

Rollout switch has opened.

Microprocessor has sensed an error in the software or hardware.

Electrical interference impeding IGC software

Check 5--amp fuse son IGC*, power to unit, 24--v circuit breaker, and transformer. Units without a 24--v circuit breaker have an internal overload in the 24--v transformer. If the overload trips, allow 10 minutes for automatic reset.

Ensure unit is fired on rate; ensure temperature rise is correct. Ensure unit’s external static pressure is within application guidelines.

Check the operation of the indoor (evaporator) fan motor. Ensure that the supply--air temperature rise is in accordance with the range on the unit nameplate. Clean or replace filters.

Check the operation of the indoor (evaporator) fan motor and that supply--air temperature rise agrees with range on unit nameplate information.

Check ignitor and flame sensor electrode spacing, gaps, etc. Ensure that fame sense and ignition wires are properly terminated. Verify that unit is obtaining proper amount of gas.

Check for proper voltage. If motor is operating, check the speed sensor plug/IGC Terminal J2 connection. Proper connection: PIN 1 -- White PIN 2 -- Red PIN 3 -- Black

Rollout switch will automatically reset, but IGC* will continue to lockout unit. Check gas valve operation. Ensure that induced--draft blower wheel is properly secured to motor shaft. Inspect heat exchanger. Reset unit at unit disconnect.

If error code is not cleared by resetting unit power, replace the IGC*.

Reset 24--v. to control board or turn thermostat off, then on again. Fault will automatically reset itself in one (1) hour.

Page 31

START-UP CHECKLIST

(Remove and Store in Job File)

I. Preliminary Information

MODEL NO.:_________________________________ SERIAL NO.:__________________________________ DATE:_______________________________________ TECHNICIAN:_________________________________

II. PRE-START-UP (Insert checkmark in box as each item is completed)

( ) VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT ( ) REMOVE ALL SHIPPING HOLD DOWN BOLTS AND BRACKETS PER INSTALLATION INSTRUCTIONS ( ) CHECK ALL ELECTRICAL CONNECTIONS AND TERMINALS FOR TIGHTNESS ( ) CHECK GAS PIPING FOR LEAKS (WHERE APPLICABLE) ( ) CHECK THAT INDOOR (EVAPORATOR) AIR FILTER IS CLEAN AND IN PLACE ( ) VERIFY THAT UNIT INSTALLATION IS LEVEL ( ) CHECK FAN WHEEL, AND PROPELLER FOR LOCATION IN HOUSING/ORIFICE AND SETSCREW TIGHTNESS

III. START-UP ELECTRICAL

SUPPLY VOLTAGE __________________________________ COMPRESSOR AMPS_________________________________ INDOOR (EVAPORATOR) FAN AMPS___________

TEMPERATURES

OUTDOOR (CONDENSER) AIR TEMPERATURE ___________DB RETURN-AIR TEMPERATURE ___________DB ___________WB COOLING SUPPLY AIR ___________DB ___________WB GAS HEAT SUPPLY AIR ___________

PRESSURES

GAS INLET PRESSURE GAS MANIFOLD PRESSURE REFRIGERANT SUCTION ___________PSIG SUCTION LINE TEMP*___________ REFRIGERANT DISCHARGE ___________PSIG DISCHARGE TEMP†___________ ( ) VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS GAS HEAT TEMPERATURE RISE TEMPERATURE RISE (See Literature) RANGE

MEASURED TEMPERATURE RISE

*Measured at suction inlet to compressor

†Measured at liquid line leavin

___________

condenser.

IN.WG

___________

574D

Page 32

574D

E2008 Bryant Heating & Cooling Systems D 7310 W. Morris St. D Indianapolis, IN 46231 Printed in U.S.A. Edition Da te: 01/08

Manufacturer reserves the r ight to discontinue, or c hange at any time, specifications or designs without notice and without incurring obligations.

Catalog No. II574D--- 03

Replaces: II574D --- 18 --- 2

Bryant 574D User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual