Bryant DURAPAC PLUS 551B Installation, Start-up And Service Instructions Manual

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Page 1

installation, start-up and service instructions

SINGLE PACKAGE ROOFTOP ELECTRIC COOLING UNITS

CONTENTS

Page

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

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-37

I. Step 1 — Provide Unit Support. . . . . . . . . . . . . . . . . 1

II. Step 2 — Field Fabricate Ductwork . . . . . . . . . . . . . 1

III. Step 3 — Install Condensate Drain Line

and External Trap. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

IV. Step 4 — Rig and Place Unit. . . . . . . . . . . . . . . . . . . 2

V. Step 5 — Make Electrical Connections . . . . . . . . . . 7

VI. Step 6 — Adjust Factory-Installed Options. . . . . . 11

VII. Step 7 — Adjust Evaporator-Fan Speed . . . . . . . . 21

PRE-START-UP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38-41

SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41-45

TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . .46-49

INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . CL-1

SAFETY CONSIDERATIONS

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

Untrained personnel can perform basic maintenance functions of cleaning coils and filters and replacing filters. All other operations sh o uld be perfor me d by trai ne d se rvi ce personnel. When working on air-conditioning equipment, observe precautions in the literature, tags and labels attached to the unit, and other safety precautions that may apply.

Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for unbrazing operations. Have fire extinguisher available f o r all brazing operations.

CAUTION: Ensure voltage listed on unit data plate

agrees with electrical supply provided for unit.

WARNING: Before performing service or maintenance operations on unit, turn off main power switch to unit and install lockout tag. Electrical shock could cause personal injury.

INSTALLATION

Unit is shipped in the vertical configuration. To convert to horizontal configuration, remove side duct opening covers. Using the same screw s, install covers on vertical duct o penings with the insulation-side down. Seals around duct openings must be tight. See Fig. 1.

551B

Dura

Cancels: II 551B-90-6 II 551B-90-7

I. STEP 1 — PROVIDE UNIT SUPPORT

A. Roof Curb

Assemble and install access ory roof curb in accorda nce with instructions shipped with curb. Install insulation, cant strips, roofing felt, and counter flashing as shown. Ductwork must be attached to curb. If elect ric or co ntrol po wer is to be routed through the basepan, attach the a ccessory thru-thebottom service connections to the basepan in accordance with the accessory installation instructions. Connections must be installed before unit is set on roof curb.

IMPORTANT: The gasketing of the unit to the roof curb is critical for a watertight seal. Install gasket supplied with the roof curb as shown in Fig. 2. Improperly applied gasket can also result in air leaks and poor unit performance.

Curb should be level. This is necessar y for unit drain to function properly. Unit leveling tolerances are shown in Fig. 3. Refer to Accessory Roof Curb Installation Instructions for additional information as required.

B. Slab Mount (Horizontal Units Only)

Provide a level concrete slab that ex te nds a minimum of 6 in. beyond unit cabinet. Install a gravel apron in front of condenser coil air inlet to prevent grass and foliage from obstructing airflow.

NOTE: Horizontal units may be installed on a roof curb if required.

C. Alternate Unit Support (Curb or Slab Mount)

A non-combustible sleeper ra il can be used in the unit curb support area. If sleeper rails cannot be used, support the long sides of the unit with a minimum of 3 equally spaced 4-in. x 4-in. pads on each side.

II. STEP 2 — FIELD FABRICATE DUCTWORK

On vertical discharge un its, secure all ducts to ro of c urb and building structure. Do not connect ductwork to unit. For horizontal applications, field -suppl ied flanges sh ould b e attache d to horizontal discharge op enings and all ductwork attached 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 a n unco nditi one d spa ce mu st be ins ulated 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 w ith applicable fire codes.

A minimum clearance to combustibles is not required around ductwork on vertical discharge units. On horizontal discharge units, a minim um cle arance of 1 in. is requi red for th e first 12 in. of ductwork. Cabinet return-air static pressure (a negative condition) should not exceed 0.30 in. wg with EconoMi$er IV, or 0.45 in. wg without economizer.

Pac

Plus Series

Sizes 090-150

71/2 to 121/2 Tons

10/15/05

Page 2

Fig. 1 — Horizontal Conversion Panels

III. STEP 3 — INSTALL CONDENSATE DRAIN LINE AND EXTERNAL TRAP

Condensate drain connections are located at the bottom and end of the unit. Unit discharge connections do not determine the use of drain connections; either drain connection can be used in ver tical or horizontal applications.

When using the standard end drain connection, make sure the plug (red) in the alternate bottom connection is tight before installing the unit.

To use the bottom drain connection for a roof curb installation, relocate the f actor y-ins tall ed plug (red) from the bott om connection to the end connection. See Fig. 4. The piping for the condensate drain and external trap can be completed after the unit is in place. The center drain plug looks like a star connection, however it can be removed with a

/2-in.

socket drive extension. All units must have an external trap for condensate drain-

age. Install a trap at least 4-in. deep and protect against freeze-up. If drain line is installed downstream from the external trap, pitch the line away from the unit at 1 in. per 10 ft of run. Do not use a pipe size smaller than the unit connection (

/4 in.). See Fig. 5.

IV. STEP 4 — RIG AND PLACE UNIT

Inspect unit for transportation damage. File any claim with transportation agency. Keep unit upright and do not drop.

Spreader bars are not required if top crating is left on unit. Rollers may be used to move unit across a roof. Level by using unit frame as a ref erence. See Table 1 and Fi g. 6 for additional information. Operating weight is shown in Table 1 and Fig. 6.

Lifting holes are provided in base rails as shown in Fig. 6 and 7. Refer to rigging instructions on unit.

A. Positioning

Maintain clearance around and above unit to provide proper airflow and service access. See Fig. 7.

Position unit on roof curb so that the following clearances are maintained:

/4 in. clearance between the roof curb and the base rail insi de the fr ont an d rear, 0.0 in. clearance betwe en the roof curb and the base rail inside on the duct end of the unit. This will result i n the distance between the roof cu rb and the base rail inside on the condenser end of the unit being approximately equal to Fig. 2, section C-C.

Do not install unit in an indoor location. Do not locate unit air inlet near exhaust vents or other sour ces o f c o ntam ina ted air.

Although unit is weatherproof, guard against water from higher level runoff and overhangs.

After unit is in position, remove polyethylene shipping wrapper and rigging skid.

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Page 3

CONNECTOR

PKG. ACCY.

CRBTMPWR001A01 CRBTMPWR002A01 1

CRBTMPWR003A01

2′-8

[827]

/16″

1′-1015/16″

[583]

CRBTMPWR004A01

D ALT

DRAIN HOLE

13/4″

[44.5]

GAS POWER CONTROL

/4″

[19] NPT

/2″

[12.7] NPT

/4″

[19] NPT

/4″ [19] NPT

/4″ [31.7]

/4″ [19] NPT

11/4″ [31.7]

/2″

[12.7] NPT

ACCESSORY

POWER

/2″

[12.7] NPT

ROOF CURB

ACCESSORY CRRFCURB003A01 1′-2″ [356] CRRFCURB004A01 2′-0″ [610]

NOTES:

1. Roof curb accessory is shipped disassembled.

2. Insulated panels: 1-in. thick polyurethane foam,

/4 lb density.

3. Dimensions in [ ] are in millimeters.

4. Roof curb: 16-gage steel.

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

6. Service clearance 4 ft on each side.

“A” UNIT SIZE

551B090-150

7. Direction of airflow.

8. Connector packages CRBTMPWR001A01 and 2A01 are for thru-the-curb gas type. Packages CRBTMPWR003A01 and 4A01 are for thru-thebottom type gas connections.

Fig. 2 — Roof Curb Details

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Page 4

MAXIMUM ALLOWABLE DIFFERENCE

A-B B-C A-C

0.5 1.0 1.0

(in.)

Fig. 3 — Unit Leveling Tolerances

NOTE:

Trap should be deep enough to offset maximum unit static differ-

ence. A 4-in. trap is recommended.

Fig. 5 — Condensate Drain Piping Details

DRAIN OUTLET

NOTE: Drain plug is shown in factory-installed position.

DRAIN PLUGHORIZONTAL

Fig. 4 — Condensate Drain Location

NOTES:

1. Place unit on curb as close as possible to the duct end.

2. Dimension in ( ) is in millimeters.

3. Hook rigging shackles through holes in base rail, as shown in detail “A.” Holes in base rails are centered around the unit center of gravity. Use wooden top skid when rigging to prevent rigging straps from damaging unit.

4. Unit weights do not include economizer. See Table 1 for economizer weights.

5. Weights include base unit without the Perfect Humidity™ dehumidification system. See Table 1 for additional unit operating weights with the Perfect Humidity dehumidification system.

OPERATING

551B

090 755 343 77.42 1967 41.5 1054 42.12 1070 102 895 406 77.42 1967 41.5 1054 50.12 1273 120 915 415 77.42 1967 41.5 1054 50.12 1273 150 930 422 77.42 1967 41.5 1054 50.12 1273

WEIGHT

lb kg in. mm in. mm in. mm

ABC

CAUTION: All panels must be in place when rigging.

Fig. 6 — Rigging Details

—4—

Page 5

Fig. 7 — Base Unit Dimensions

—5—

Page 6

Table 1 — Physical Data

UNIT 551B 090 102 120 150 NOMINAL CAPACITY (tons) 7

OPERATING WEIGHT (lb)

Unit 755 895 915 930 EconoMi$er IV 75 75 75 75 Perfect Humidity™ Dehumidification Package 44 51 51 51 Roof Curb 143 143 143 143

COMPRESSOR Scroll

Quantity 2222 Oil (oz) (each compressor) 53 53 50 60

REFRIGERANT TYPE R-22

Expansion Device Metering Device Operating Charge (lb-oz) Standard Unit

Circuit 1 7-10 9- 8 9-6 9-8 Circuit 2 8- 2 8-13 10-9 9-5

Unit With Perfect Humidity Dehumidification Package

Circuit 1 13-0 16-0 16-8 15-3 Circuit 2 13-6 16-8 17-8 16-6

CONDENSER FAN Propeller Type

Quantity...Diameter (in.) 2...22 2...22 2...22 2...22 Nominal Cfm 6500 6500 7000 7000 Motor Hp...Rpm Watts Input (Total) 650 650 650 650

CONDENSER COIL High-Efficiency Enhanced Copper Tubes, Lanced Aluminum Fins

Rows...Fins/in. 2...17 2...17 2...17 2...17 Total Face Area (sq ft) 20.5 25.0 25.0 25.0

EVAPORATOR COIL High Efficiency Enhanced Copper Tubes, Aluminum Double-Wavy Fins, Face Split

Standard Unit

Rows...Fins/in. 3...15 4...15 4...15 4...15 Total Face Area (sq ft) 8.9 11.1 11.1 11.1

Unit with Perfect Humidity Dehumidification Package

Rows...Fins/in. 2...17 2...17 2...17 2...17 Total Face Area (sq ft) 6.3 8.4 8.4 8.4

EVAPORATOR FAN Centrifugal Type, Belt Drive

Size (in.) 15 x 15 15 x 15 15 x 15 15 x 15 Nominal Cfm — Standard 3000 3400 4000 5000 Maximum Continuous Bhp

Standard 2.90 2.90 3.70 5.25

High Static 4.20 4.20 5.25 — Motor Frame 56 56 56 56 Fan Rpm Range

Standard 840-1085 840-1085 860-1080 830-1130

High Static 860-1080 860-1080 830-1130 — Motor Bearing Type Ball Ball Ball Ball Maximum Fan Rpm 2100 2100 2100 2100 Motor Pulley Pitch Diameter A/B (in.)

Standard 3.4/4.4 3.4/4.4 4.0/5.0 2.8/3.8

High Static 4.0/5.0 4.0/5.0 2.8/3.8 — Nominal Motor Shaft Diameter (in.) Fan Pulley Pitch Diameter (in.)

Standard 7.0 7.0 8.0 5.8

High Static 8.0 8.0 5.8 — Belt — Quantity...Type...Length (in.)

Standard 1...A...48 1...A...51 1...A...51 1...BX...46

High Static 1...A...55 1...A...55 1...BX...46 — Pulley Center Line Distance (in.) 16.75-19.25 16.75-19.25 15.85-17.50 15.85-17.50 Speed Change per Full Turn of Movable Pulley Flange (rpm)

Standard 50 50 45 60

High Static 60 60 60 — Movable Pulley Maximum Full Turns From Closed Position

Standard 5556

High Static 556— Factory Setting — Full Turns Open 5555 Factory Speed Setting (rpm)

Standard 840 840 862 887

High Static 860 860 887 — Fan Shaft Diameter at Pulley (in.) 1111

HIGH-PRESSURE SWITCH (psig)

Standard Compressor Internal Relief (Differential) 450 ± 50 Cutout 428 Reset (Auto.) 320

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

Cutout 7 ± 3 Reset (Auto.) 22 ± 5

FREEZE-PROTECTION THERMOSTAT

Opens (F) 30 ± 5 Closes (F) 45 ± 5

OUTDOOR-AIR INLET SCREENS Cleanable. Screen size and quantity varies by options selected. RETURN-AIR FILTERS Throwaway

Quantity...Size (in.) 4...16 x 20 x 2 4...16 x 20 x 2 4...20 x 20 x 2 4...20 x 20 x 2

LEGEND

Bhp — Brake Horsepower

/4...1100

81/

/4...1100

10 121/

/4...1100

—6—

Page 7

V. STEP 5 — MAKE ELECTRICAL CONNECTIONS

WARNING: Unit cabinet must have an uninter-

rupted, unbroken electrical ground to minimize the possibility of personal injury if an electrical fault should occur. This ground may consist of electrical wire connected to unit ground lug in control compartment, or conduit approved for electrical ground when installed in accordance with NEC (National Electrical Code) ANSI (American Natio nal S tandards In stitute) / NFPA (National Fire Protection A ssociation) 70-l atest year and local electrical codes. Failure to follow this warning could result in the installer being liable for personal injury of others.

A. Field Power Supply

All units except 208/230-v units are factory-wired for the voltage shown on the unit nameplate. If the 208/230-v unit is to be connected to a 208-v power supply, the transformer must be rewired by disconnecting the black wire from the 230-v terminal wire on the transfor mer and connecting it to the 200-v red terminal of the transformer. The end of the orange wire must th en be insulated.

Refer to unit label diagram for additional information. Pigtails are provi ded for field wi re connectio ns. Use factorysupplied splices or UL (Underwriters’ Laboratories) approved copper/aluminum connector.

When installing units, provide a disconnect per the NEC. All field wiring must comply with the NEC and local require-

ments. In Canada, electrical connections must be made in accordance with CSA (Canadian Standards Association) C22.1 Canadian Electrical Code Part One.

Install field wiring as follows:

1. Install conduit through side pan el opening s . For units without electric heat, install conduit between disconnect and control box.

2. Install power lines to terminal connections as shown in Fig. 8.

3. For units with electric heat, refer to Accessory Installation Instructions.

During operation, vo ltage to compressor termina ls must be within range indicated on unit nameplate (see Table 2). On 3-phase units, voltages between phases must be balanced within 2%, and the current within 10%. Use the formula shown in Table 2, Note 2 on page 10 to determine the percentage of voltage imbalance. Operation on improper line voltage or excessive phase imbalance constitutes abuse and may cause damage to electrical components. Such operation would invalidate any applicable Bryant warranty.

See Table 3 for electric heater and single point box usage.

551B090-120, 208/230-3-60

551B090-150, 460-3-60

551B090-150, 575-3-60

C—Contactor COMP(S) — Compressor IFC — Indoor (Evaporator) Fan Contactor NEC — National Electrical Code OFC — Outdoor (Condenser) Fan Contactor TB — Terminal Block

Fig. 8 — Power Wiring Connections

—7—

551B150, 208/230-3-60

LEGEND

Terminal Block Connection Field Wiring

Factory Wiring Splice Connection (Factory-Supplied)

Page 8

UNIT 551B

090

102

See page 10 for legend and n otes.

NOMINAL

V-P H- H z

208/230-3-60

460-3-60

575-3-60

208/230-3-60

460-3-60

Table 2 — Electrical Data

VOLTA GE

IFM

CONV

TYPE

OUTLET

STD NO 187 254 12.4 88.0 12.4 88.0 2 1.4 7.5

STD YES 187 254 12.4 88.0 1 2.4 88.0 2 1.4 7.5

HIGH

STATIC

HIGH

STATIC

STD NO 4 14 508 6.4 44.0 6.4 44.0 2 0.7 3.4

STD YES 414 508 6.4 44.0 6.4 44.0 2 0.7 3.4

HIGH

STATIC

HIGH

STATIC

STD NO 5 18 632 4.8 34.0 4.8 34.0 2 0.7 3.4

STD YES 518 632 4.8 34.0 4.8 34.0 2 0.7 3.4

HIGH

STATIC

HIGH

STATIC

STD NO 187 254 13.4 105.0 13.1 105.0 2 1.4 7.5

STD YES 187 254 13.4 105.0 13.1 105.0 2 1.4 7.5

HIGH

STATIC

HIGH

STATIC

STD NO 4 14 508 7.4 55.0 7.4 55.0 2 0.7 3.4

STD YES 414 508 7.4 55.0 7.4 55.0 2 0.7 3.4

HIGH

STATIC

HIGH

STATIC

RANGE

Min Max RLA LRA RLA LRA FLA LRA

NO 187 254 12.4 88.0 12.4 88.0 2 1.4 10.6

YES 187 254 12.4 88.0 12.4 88.0 2 1.4 10.6

NO 414 508 6.4 44.0 6.4 44.0 2 0.7 4.8

YES 414 508 6.4 44.0 6.4 44.0 2 0.7 4.8

NO 518 632 4.8 34.0 4.8 34.0 2 0.7 4.8

YES 518 632 4.8 34.0 4.8 34.0 2 0.7 4.8

NO 187 254 13.4 105.0 13.1 105.0 2 1.4 10.6

YES 187 254 13.4 105.0 13.1 105.0 2 1.4 10.6

NO 414 508 7.4 55.0 7.4 55.0 2 0.7 4.8

YES 414 508 7.4 55.0 7.4 55.0 2 0.7 4.8

COMP NO. 1 COMP NO. 2

OFM

QTY

OFM

FLA

ELECTRIC HEATER POWER SUPPLY DISCONNECT

IFM

Nominal

FLA

kW*

— —/— 38.2/ 38.2 45/45 — 40/ 40 242/242

7.8/10.4 21.7/ 25.0 38.2/ 40.6 45/45 — 40/ 40 242/242

12.0/16.0 33.4/ 38.5 51.1/ 57.5 60/60 — 47/ 53 242/242

18.6/24.8 51.7/ 59.7 74.0/ 84.0 — 80/ 90 68/ 77 242/242

24.0/32.0 66. 7/ 77.0 92.8/105.6 — 100/110 85/ 97 2 42/242

31.8/42.4 88. 4/102.0 119.9/136.9 — 125/150 110/126 242/242

— —/— 44.2/ 44.2 50/50 — 46/ 46 247/247

7.8/10.4 21.7/ 25.0 44.2/ 45.6 50/50 — 46/ 46 247/247

12.0/16.0 33.4/ 38.5 56.1/ 62.5 — 60/ 70 53/ 58 247/247

18.6/24.8 51.7/ 59.7 79.0/ 89.0 — 80/ 90 74/ 83 247/247

24.0/32.0 66. 7/ 77.0 97.8/110.6 — 100/125 91/103 247/247

31.8/42.4 88. 4/102.0 124.9/141.9 — 125/150 116/131 247/247

— —/— 41.3/ 41.3 45/45 — 44/ 44 267/267

7.8/10.4 21.7/ 25.0 41.3/ 44.5 50/50 — 44/ 44 267/267

12.0/16.0 33.4/ 38.5 54.9/ 61.4 — 60/ 70 51/ 56 267/267

18.6/24.8 51.7/ 59.7 77.9/ 87.8 — 80/ 90 72/ 81 267/267

24.0/32.0 66. 7/ 77.0 96.6/109.5 — 100/110 89/101 267/267

31.8/42.4 88. 4/102.0 123.7/140.8 — 125/150 114/129 267/267

— —/— 47.3/ 47.3 50/50 — 49/ 49 271/271

7.8/10.4 21.7/ 25.0 47.3/ 49.5 60/60 — 49/ 49 271/271

12.0/16.0 33.4/ 38.5 59.9/ 66.4 — 70/ 70 56/ 62 271/271

18.6/24.8 51. 7/ 59.7 82.9/ 92.8 — 90 /100 77/ 86 271/271

24.0/32.0 66.7/ 77.0 101.6/114.5 — 110/125 94/106 271/271

31.8/42.4 88. 4/102.0 128.7/145.8 — 150/150 119/135 271/271

— — 19.2 20 — 20 12 1

13.9 16.7 25.1 20 — 23 12 1

16.5 19.8 29.1 20 — 27 12 1

27.8 33.4 46.0 50 — 42 12 1

33.0 39.7 53.9 60 — 50 12 1

41.7 50.2 66.9 — 70 62 121

— — 21.9 20 — 23 12 3

13.9 16.7 28.5 20 — 26 12 3

16.5 19.8 31.8 35 — 29 12 3

27.8 33.4 48.7 50 — 45 12 3

33.0 39.7 56.6 60 — 52 12 3

41.7 50.2 69.6 — 70 64 123

— — 20.6 20 — 22 13 3

13.9 16.7 26.9 20 — 25 13 4

16.5 19.8 30.8 35 — 28 13 4

27.8 33.4 47.8 50 — 44 13 4

33.0 39.7 55.6 60 — 51 13 4

41.7 50.2 68.7 — 70 63 134

— — 23.3 20 — 24 13 5

13.9 16.7 30.3 35 — 27 13 6

16.5 19.8 33.5 35 — 31 13 6

27.8 33.4 50.5 60 — 46 13 6

33.0 39.7 58.3 60 — 54 13 6

41.7 50.2 71.4 — 80 66 136

— — 14.6 20 — 15 9 4

17.0 16.4 23.8 20 — 22 9 5

34.0 32.7 44.3 45 — 41 9 5

— — 16.8 20 — 17 9 6

17.0 16.4 26.5 20 — 24 9 6

34.0 32.7 44.3 45 — 43 9 6

— — 15.8 20 — 17 10 4

17.0 16.4 25.2 20 — 23 10 4

34.0 32.7 45.7 50 — 42 10 4

— — 17.9 20 — 19 10 6

17.0 16.4 27.9 20 — 25 10 6

34.0 32.7 45.7 50 — 44 10 6

— —/— 40.2/ 40.2 45/45 — 42/ 42 276/276

7.8/10.4 21.7/ 25.0 40.2/ 40.6 45/45 — 42/ 42 276/276

12.0/16.0 33.4/ 38.5 51.1/ 57.5 60/60 — 47/ 53 276/276

18.6/24.8 51.7/ 59.7 74.0/ 84.0 — 80/ 90 68/ 77 276/276

24.0/32.0 66. 7/ 77.0 92.8/105.6 — 100/110 85/ 97 276 /276

31.8/42.4 88. 4/102.0 119.9/136.9 — 110/150 110/126 276/276

— —/— 46.2/ 46.2 50/50 — 48/ 48 281/281

7.8/10.4 21.7/ 25.0 46.2/ 46.2 50/50 — 48/ 48 281/281

12.0/16.0 33.4/ 38.5 56.1/ 62.5 — 60/ 70 53/ 58 281/281

18.6/24.8 51.7/ 59.7 79.0/ 89.0 — 80/ 90 74/ 83 281/281

24.0/32.0 66. 7/ 77.0 97.8/110.6 — 100/125 91/103 281/281

31.8/42.4 88. 4/102.0 124.9/141.9 — 125/150 116/131 281/281

— —/— 43.3/ 43.3 50/50 — 46/ 46 301/301

7.8/10.4 21.7/ 25.0 43.3/ 44.5 50/50 — 46/ 46 301/301

12.0/16.0 33.4/ 38.5 54.9/ 61.4 — 60/ 70 51/ 56 301/301

18.6/24.8 51.7/ 59.7 77.9/ 87.8 — 80/ 90 72/ 81 301/301

24.0/32.0 66. 7/ 77.0 96.6/109.5 — 100/110 89/101 301/301

31.8/42.4 88. 4/102.0 123.7/140.8 — 125/150 114/129 301/301

— —/— 49.3/ 49.3 60/60 — 51/ 51 305/305

7.8/10.4 21.7/ 25.0 49.3/ 49.5 60/60 — 51/ 51 305/305

12.0/16.0 33.4/ 38.5 59.9/ 66.4 — 70/ 70 56/ 62 305/305

18.6/24.8 51. 7/ 59.7 82.9/ 92.8 — 90 /100 77/ 86 305/305

24.0/32.0 66.7/ 77.0 101.6/114.5 — 110/125 94/106 305/305

31.8/42.4 88. 4/102.0 128.7/145.8 — 150/150 119/135 305/305

— — 21.5 20 — 23 14 3

13.9 16.7 25.1 20 — 23 14 3

16.5 19.8 29.1 20 — 27 14 3

27.8 33.4 46.0 50 — 42 14 3

33.0 39.7 53.9 60 — 50 14 3

41.7 50.2 66.9 — 70 62 143

— — 24.2 20 — 25 14 5

13.9 16.7 28.5 20 — 26 14 5

16.5 19.8 31.8 35 — 29 14 5

27.8 33.4 48.7 50 — 45 14 5

33.0 39.7 56.6 60 — 52 14 5

41.7 50.2 69.6 — 70 64 145

— — 22.9 20 — 24 15 5

13.9 16.7 26.9 20 — 25 15 6

16.5 19.8 30.8 35 — 28 15 6

27.8 33.4 47.8 50 — 44 15 6

33.0 39.7 55.6 60 — 51 15 6

41.7 50.2 68.7 — 70 63 156

— — 25.6 20 — 27 15 7

13.9 16.7 30.3 35 — 27 15 8

16.5 19.8 33.5 35 — 31 15 8

27.8 33.4 50.5 60 — 46 15 8

33.0 39.7 58.3 60 — 54 15 8

41.7 50.2 71.4 — 80 66 158

FLA MCA

Fuse

HACR

Bkr

MOCP

SIZE†

—8—

Page 9

UNIT 551B

(cont)

See page 10 for legend and n otes.

102

120

150

NOMINAL

V-P H-H z

575-3-60

208/230-3-60

460-3-60

575-3-60

208/230-3-60

460-3-60

575-3-60

Table 2 — Electrical Data (cont)

VO LTAGE

IFM

CONV

TYPE

OUTLET

STD NO 518 632 6.4 44.0 6.4 44.0 2 0.7 3.4

STD YES 518 632 6.4 44.0 6.4 44.0 2 0.7 3.4

HIGH

STATIC

HIGH

STATIC

HIGH

STATIC

HIGH

STATIC

HIGH

STATIC

HIGH

STATIC

HIGH

STATIC

HIGH

STATIC

YES 518 632 6.4 44.0 6.4 44.0 2 0.7 4.8

STD NO 187 254 17.6 1 25.0 17.6 125.0 2 1.4 10.6

STD YES 187 254 17.6 125.0 17.6 125.0 2 1.4 10.6

YES 187 254 17.6 125.0 17.6 125.0 2 1.4 15.0

STD NO 414 508 8.3 62.5 8.3 62.5 2 0.7 4.8

STD YES 414 508 8.3 62.5 8.3 62.5 2 0.7 4.8

YES 414 508 8.3 62.5 8.3 62.5 2 0.7 7.4

STD NO 518 632 6.3 50.0 6.3 50.0 2 0.7 4.8

STD YES 518 632 6.3 50.0 6.3 50.0 2 0.7 4.8

YES 518 632 6.3 50.0 6.3 50.0 2 0.7 7.4

STD NO 187 254 19.0 1 56.0 19.0 156.0 2 1.4 15.0

STD YES 187 254 19.0 156.0 19.0 156.0 2 1.4 15.0

STD NO 414 508 9.0 70.0 9.0 70.0 2 0.7 7.4

STD YES 414 508 9.0 70.0 9.0 70.0 2 0.7 7.4

STD NO 518 632 7.4 54.0 7.4 54.0 2 0.7 7.4

STD YES 518 632 7.4 54.0 7.4 54.0 2 0.7 7.4

RANGE

Min Max RLA LRA RLA LRA FLA LRA

NO 518 632 6.4 44.0 6.4 44.0 2 0.7 3.4

NO 187 254 17.6 125.0 17.6 125.0 2 1.4 15.0

NO 414 508 8.3 62.5 8.3 62.5 2 0.7 7.4

NO 518 632 6.3 50.0 6.3 50.0 2 0.7 7.4

COMP NO. 1 COMP NO. 2

OFM QTY

OFM

FLA

ELECTRIC HEATER POWER SUPPLY DISCONNECT

IFM

Nominal

FLA

kW*

— — 18.2 20 — 19 114

17.0 16.4 23.8 20 — 22 115

34.0 32.7 44.3 45 — 41 115

— — 20.4 25 — 21 116

17.0 16.4 26.5 25 — 24 116

34.0 32.7 46.9 50 — 43 116

— — 18.2 20 — 19 114

17.0 16.4 23.8 20 — 22 115

34.0 32.7 44.3 45 — 41 115

— — 21.5 25 — 22 126

17.0 16.4 27.9 25 — 25 126

34.0 32.7 48.3 50 — 44 126

— —/— 53.0/ 53.0 60/60 — 56/ 56 341/341

7.8/10.4 21.7/ 25.0 53.0/ 53.0 60/60 — 56/ 56 341/ 341

12.0/16.0 33.4/ 38.5 54.9/ 61.4 — 60/ 70 56/ 56 341/341

24.0/32.0 66.7/ 77.0 96.6/109.5 — 100/110 89/101 341/ 341

31.8/42.4 88.4/102.0 123.7/140.8 — 125/150 114/129 341/341

37.5/50.0 104.2 /120.3 143.5/13 3.5 — 150/150 132 /151 341/341

— —/— 59.0/ 59.0 70/70 — 61/ 61 345/345

7.8/10.4 21.7/ 25.0 59.0/ 59.0 — 70/ 70 61/ 61 345/345

12.0/16.0 33.4/ 38.5 59.9/ 66.4 — 70/ 70 61/ 62 345/345

24.0/32.0 66.7/ 77.0 101.6/114.5 — 110/125 94/106 34 5/345

31.8/42.4 88.4/102.0 128.7/145.8 — 150/150 119/135 345/345

37.5/50.0 104.2 /120.3 148.5/13 7.5 — 150/150 138 /156 345/345

— —/— 57.4/ 57.4 70/70 — 61/ 61 364/364

7.8/10.4 21.7/ 25.0 57.4/ 57.4 — 70/ 70 61/ 61 364/364

12.0/16.0 33.4/ 38.5 60.4/ 66.9 — 70/ 80 61/ 62 364/364

24.0/32.0 66.7/ 77.0 102.1/115.0 — 110/125 94/106 36 4/364

31.8/42.4 88.4/102.0 129.2/146.3 — 150/150 119/135 364/364

37.5/50.0 104.2 /120.3 149.0/13 9.0 — 150/175 137 /156 364/364

— —/— 63.4/ 63.4 70/70 — 66/ 66 369/369

7.8/10.4 21.7/ 25.0 63.4/ 63.4 — 70/ 70 66/ 66 369/369

12.0/16.0 33.4/ 38.5 65.4/ 71.9 — 80/ 80 66/ 67 369/369

24.0/32.0 66.7/ 77.0 107.1/120.0 — 110/125 99/111 36 9/369

31.8/42.4 88.4/102.0 134.2/151.3 — 150/175 124/140 369/369

37.5/50.0 104.2 /120.3 154.0/14 3.0 — 175/175 143 /161 369/369

— — 24.9 20 — 26 170

13.9 16.7 26.9 20 — 26 171

16.5 19.8 30.8 35 — 28 171

33.0 39.7 55.6 60 — 51 171

41.7 50.2 68.7 — 70 63 171

50.0 60.1 66.1 — 80 75 171

— — 27.6 20 — 29 172

13.9 16.7 30.3 35 — 29 173

16.5 19.8 33.5 35 — 31 173

33.0 39.7 58.3 60 — 54 173

41.7 50.2 71.4 — 80 66 173

50.0 60.1 70.1 — 80 77 173

— — 27.5 20 — 29 182

13.9 16.7 30.1 35 — 29 182

16.5 19.8 34.1 40 — 31 182

33.0 39.7 58.9 60 — 54 182

41.7 50.2 71.9 — 80 66 182

50.0 60.1 69.4 — 80 78 182

— — 30.2 35 — 32 184

13.9 16.7 33.5 40 — 32 184

16.5 19.8 36.8 40 — 34 184

33.0 39.7 61.6 — 70 57 184

41.7 50.2 74.6 — 80 69 184

50.0 60.1 73.4 — 80 80 184

— — 19.1 25 — 20 136

17.0 16.4 25.2 25 — 23 136

34.0 32.7 45.7 50 — 42 136

51.0 49.1 53.9 60 — 61 136

— — 21.3 25 — 22 138

17.0 16.4 27.9 25 — 25 138

34.0 32.7 48.3 50 — 44 138

51.0 49.1 56.5 60 — 63 138

— — 21.2 25 — 23 145

17.0 16.4 27.8 25 — 26 146

34.0 32.7 48.3 50 — 44 146

51.0 49.1 56.5 — 70 63 146

— — 23.4 25 — 25 147

17.0 16.4 30.5 35 — 28 148

34.0 32.7 50.9 60 — 46 148

51.0 49.1 59.1 — 70 65 148

— —/— 60.6/ 60.6 70/70 — 64/ 64 426/426

7.8/10.4 21.7/ 25.0 60.6/ 60.6 — 70/ 70 64/ 64 426/426

12.0/16.0 33.4/ 38.5 60.4/ 66.9 — 70/ 80 64/ 64 426/426

24.0/32.0 66.7/ 77.0 102.1/115.0 — 110/125 94/106 42 6/426

31.8/42.4 88.4/102.0 129.2/146.3 — 150/150 119/135 426/426

37.5/50.0 104.2 /120.3 149.0/13 9.0 — 150/175 137 /156 426/426

— —/— 66.6/ 66.6 70/70 — 70/ 70 431/431

7.8/10.4 21.7/ 25.0 66.6/ 66.6 — 70/ 70 70/ 70 431/431

12.0/16.0 33.4/ 38.5 65.4/ 71.9 — 80/ 80 70/ 70 431/431

24.0/32.0 66.7/ 77.0 107.1/120.0 — 110/125 99/111 43 1/431

31.8/42.4 88.4/102.0 134.2/151.3 — 150/175 124/140 431/431

37.5/50.0 104.2 /120.3 154.0/14 3.0 — 175/175 143 /161 431/431

— — 29.1 35 — 31 197

13.9 16.7 30.1 35 — 31 197

16.5 19.8 34.1 40 — 31 197

33.0 39.7 58.9 60 — 54 197

41.7 50.2 71.9 — 80 66 197

50.0 60.1 69.4 — 80 78 197

— — 31.8 35 — 33 199

13.9 16.7 33.5 40 — 33 199

16.5 19.8 36.8 40 — 34 199

33.0 39.7 61.6 — 70 57 199

41.7 50.2 74.6 — 80 69 199

50.0 60.1 73.4 — 80 80 199

— — 23.7 30 — 25 153

17.0 16.4 27.8 30 — 26 154

34.0 32.7 48.3 50 — 44 154

51.0 49.1 56.5 — 70 63 154

— — 25.9 30 — 27 155

17.0 16.4 30.5 35 — 28 155

34.0 32.7 50.9 60 — 46 155

51.0 49.1 59.1 — 70 65 155

FLA MCA

Fuse

HACR

Bkr

MOCP

SIZE†

—9—

Page 10

LEGEND AND NOTES FOR TABLE 2

FLA — Full Load Amps HACR — Heating, Air Conditioning and Refrigeration IFM — Indoor (Evaporator) Fan Motor LRA — Locked Rotor Amps MCA — Minimum Circuit Amps MOCP— Maximum Overcurrent Protection NEC — National Electrical Code OFM — Outdoor (Condenser) Fan Motor RLA — Rated Load Amps

*Heater capacity (kW) is based on heater voltage of 208, 240, 480, and 575-V. If power

distribution voltage varies from rated heater voltage, heater kW will vary accordingly.

†Used to determine minimum disconnect per NEC.

NOTES:

1. In compliance with NEC requirements for multimotor and combination load equip-

2. Unbalanced 3-Phase Supply Voltage

LEGEND

ment (refer to NEC Articles 430 and 440), the overcurrent protective device for the unit shall be fuse or HACR breaker.

Never operate a motor where a phase imbalance in supply voltage is greater than 2%.

Use the following formula to determine the percent of voltage imbalance.

% Voltage Imbalance

max voltage deviation from average voltage

= 100 x

average voltage

Example: Supply voltage is 460-3-60.

AB = 452 v BC = 464 v AC = 455 v

Average Voltage =

Determine maximum deviation from average voltage.

(AB) 457 – 452 = 5 v (BC) 464 – 457 = 7 v

(AC) 457 – 455 = 2 v Maximum deviation is 7 v. Determine percent of voltage imbalance.

% Voltage Imbalance = 100 x

= 1.53%

This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%.

IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact your local electric utility company immediately.

3. Non-fused disconnect switch cannot be used when rooftop unit electrical ratings exceed 80 amps.

Table 3 — Electric Heater Usage

UNIT 551B

090

102

120

150

NOTES:

1. The rated heater voltage is 240, 480, and 575 v. If power distribution voltage varies from rated heater voltage, heater kW vary accordingly.

2. To determine heater kW at voltages other than those shown in table, use the following formula: Heater kW new = Heater kW rated x (unit power distribution voltage / rated heater voltage)

As an example: For a 16 kW heater rated at 240 v with a power distribution voltage of 215 v kW new = 16 kW (215/240) kW new = 12.8 kW (rating at 215 v)

VO LTAGE

(60 Hz)

208/230/240

(3 phase)

460/480

(3 phase)

575

(3 phase)

208/230/240

(3 phase)

460/480

(3 phase)

575

(3 phase)

208/230/240

(3 phase)

460/480

(3 phase)

575

(3 phase)

208/230/240

(3 phase)

460/480

(3 phase)

575

(3 phase)

ACCESORY

7.8/ 9.6/10.4 017 006

12.0/14.7/16.0 010 006

18.6/22.8/24.8 011 007

24.0/29.4/32.0 012 007

31.8/39.0/42.4 012+017 009

12.8/13.9 016 006

15.2/16.5 013 006

25.6/27.8 014 006

30.4/33.0 015 006

38.4/41.7 014+016 008

17.0 018 006

34.0 019 006

7.8/ 9.6/10.4 017 011

12.0/14.7/16.0 010 011

18.6/22.8/24.8 011 012

24.0/29.4/32.0 012 012

31.8/39.0/42.4 012+017 015

12.8/13.9 016 011

15.2/16.5 013 011

25.6/27.8 014 011

30.4/33.0 015 011

38.4/41.7 014+016 014

17.0 018 011

34.0 019 011

7.8/ 9.6/10.4 017 011

12.0/14.7/16.0 010 012

24.0/29.4/32.0 012 012

31.8/38.9/42.4 012+017 015

37.5/46.0/50.0 010+012 015

12.8/13.9 016 011

15.2/16.5 013 011

30.4/33.0 015 011

38.4/41.7 014+016 014

46.0/50.0 013+015 014

17.0 018 011

34.0 019 011

51.0 018+019 014

7.8/ 9.6/10.4 017 012

12.0/14.7/16.0 010 012

24.0/29.4/32.0 012 012

31.8/38.9/42.4 012+017 015

37.5/46.0/50.0 010+012 015

12.8/13.9 016 011

15.2/16.5 013 011

30.4/33.0 015 011

38.4/41.7 014+016 014

46.0/50.0 013+015 014

17.0 018 011

34.0 019 014

51.0 018+019 014

ACCESSORY HEATER

PART NUMBER

CRHEATER---A00

452 + 464 + 455

1371

457

ACCESSORY SINGLE POINT BOX

PART NUMBER

CRSINGLE---A00

—10—

Page 11

B. Field Control Wiring

Install a Bryant-approved accessory thermostat assembly according to installation instructions included with the accessory. Locate thermostat assembly on a solid wall in the conditioned space to sense average temperature in accordance with thermostat installation instructions.

Route thermostat cable or equivalent single leads of colored wire from subbase terminals to low-voltage connections on unit (shown in Fig. 9) as described in Steps 1 through 4 below .

NOTE: For wire runs up to 50 ft, use no. 18 AWG (American Wire Gage) insulated wire (35 C minimum). For 51 to 75 ft, use no. 16 AWG insulated wire (35 C minimum). For over 75 ft, use no. 14 AWG insulated wire (35 C minimum). All wire larger than no. 18 AWG cannot be directl y c onnect ed to the thermostat and will require a junction box and splice at the thermostat.

1. If mounted on a ro o f c ur b an d el ec tr ic al pow e r is to b e run through the basepan, an accessory thru-thebottom connection kit is required. This is available through the local Bryant distributor. This kit is required to ensure a reliable water-tight connection.

2. If unit is mounted on roof curb and accessory thruthe-bottom service connections are used, route wire through connections.

3. Pass control w ires thro ugh th e hole pr ovided o n unit (see connection D in Connection Sizes table in Fig. 7).

4. Feed wire through the raceway built into the corner post to the 24-v barrier located on the l eft side of the control box. See Fig. 9. The raceway provides the

UL required clearan ce between the h igh-voltage an d low-voltage wiring.

5. Connect thermostat wires to s crew terminals of lowvoltage connect or (se e Fi g. 9).

NOTE: I f thru-the-bottom power connections a re used refer to the accessory installat ion instructions for information on power wiring. Refer to Fig. 7 for drilling holes in basepan.

C. Heat Anticipator Settings

For units with electric heat, set heat anticipator settings as shown in Table 4.

VI. STEP 6 — ADJUST FACTORY-INSTALLED OPTIONS A. Disconnect Switch

The optional disconnect switch is non-fused. The switch has the capability of being locked in place for safety purposes.

B. Perfect Humidity™ Dehumidification System

Perfect Humidity system ope r at io n can be co ntrol l ed by fi eld installation of a Bryant-approved humidistat (Fig. 11), or light commercial Thermidist at™ device (Fig. 12). To install the humidistat:

1. Route humidistat cable through hole provided in unit corner post.

2. Feed wires through the raceway built into the corner post to the 24-v barrier located on the left side of the control box. See Fig. 10. The raceway provides the UL-required clearance between high-voltage and lowvoltage wiring.

COOL STAGE 1

FAN

HEAT STAGE 1

COOL STAGE 2

HEAT STAGE 2

24 VAC HOT

24 VAC COM

N/A

OUTDOOR AIR

SENSOR

THERMOSTAT DIPSWITCH SETTINGS

ON OFF

NOTE: Underlined letter indicates active thermostat output when configured for A/C operation.

LEGEND

Field Wiring

Y1/W2

W/W1

Y/Y2

O/W2

IPD/X

WIRE CONNECTIONS TO LOW-VOLTAGE SECTION (CONNECTION BOARD)

CONNECTION BOARD

FACTORYINSTALLED DISCONNECT (OPTION)

RACEWAY

COMPRESSOR NO. 2

COMPRESSOR NO. 1

CONVENIENCE OUTLET (OPTION)

HOLE IN END PANEL

Fig. 9 — Low-Voltage Connections

Fig. 10 — Field Control Wiring Raceway

Table 4 — Heat Anticipator Settings

UNIT

551B

*Heater capacity (kW) is based on heater voltage of 208 v, 240 v, 480 v or 575 v. If power distribution voltage to unit varies from rated heater voltage,

heater kW will vary accordingly.

Heater

kW*

10.4, 16.0 0.3 NA NA 13.9, 16.5

24.8, 32.0 0.6 0.3 0.3 27.8, 33.0

42.4, 50.0 0.9 0.6 0.3 41.7, 50.0 0.6 0.3 0.3 51.0 0.6 0.3 0.3

208/230 460 575

1-Stage

Configuration

2-Stage

Stage 1 Stage 2 Stage 1 Stage 2 Stage 1 Stage 2

Heater

UNIT VOLTAGE

Configuration

1-Stage

0.3 NA NA 17.0, 34.0 0.3 NA NA

2-Stage

Heater

1-Stage

Configuration

2-Stage

—11—

Page 12

3. Use a wire nut to connect humidistat cable into lowvoltage wiring as shown in Fig. 13.

To install Thermidistat™ device:

1. Route Thermidistat cable through hole provided in unit corner post.

2. Feed the wires through the raceway built into the corner post to the 24-v barrier located on the left side of the control box. See Fig. 10. The raceway provides the UL-required clearance between high and low voltage wiring.

% RELATIVE HUMIDITY

3. A field-supplied relay must be installed between the Thermidistat device and the Perfect Humidity™ circuit (recommended relay: HN612KK324) Fig. 14. The relay coil is connected be tween the DEHUM output and C (common) of the unit. The relay controls the Perfect Humidity solenoid valve and must be wired between the Perfect Humidity fuse and the lowpressure switch. Refer to the installation instructions included with the Bryant Light Commercial Thermidistat device for more information.

Fig. 11 — Accessory Field-Installed Humidistat

LEGEND

CB — Circuit Breaker CR — Cooling Relay DHR — Dehumidify Relay DSV — Discharge Solenoid Valve HR — Heater Relay HU — Humidistat LPS — Low Pressure Switch LSV — Liquid Solenoid Valve LTLO — Low Temperature Lockout TB — Terminal Block

TRAN — Transformer

Fig. 13 — Typical Perfect Humidity Dehumidification System Humidistat Wiring (208/230-v Unit Shown)

Fig. 12 — Light Commercial Thermidistat Device

Field Splice

Terminal (Unmarked)

Splice

Factory Wiring

Field Control Wiring

LCT

C Y1 Y2

G W1 W2

DEHUM

CB — Circuit Breaker LCT — Light Commercial Thermidistat Device LLSV — Liquid Line Solenoid Valve LT LO — Low Temperature Lockout

T STAT WIRES

LEGEND

Fig. 14 — Typical Rooftop Unit with Perfect Humidity Dehumidification System with Thermidistat Device

—12—

ROOF TOP UNIT

R C Y1

G W1 W2

PINK

3.2 AMPS

LTLO

PERFECT HUMIDITY SYSTEM

RED

PINK

24 V

FROM PERFECT HUMIDITY SYSTEM LLSV

Page 13

C. Convenience Outlet

An optional convenience outlet provides power for rooftop use. For maintenance personnel safety, the convenience outlet power is off when the unit disconnect is off. Adjacent unit outlets may be used f or service tools. An optional “Ho t Outlet” is available from the factory as a speci al order item.

D. Manual Outdoor-Air Damper

The outdoor-air hood and screen are attached to the basepan at the bottom of the unit for shipping.

Assembly:

1. Determine quantity of ventilation required for building. Record amount for use in Step 8.

2. Remove filter access panel by raising panel and swinging panel outward. Panel is now disengaged from track an d can be removed. No tools are required to remove the filt er ac cess pa nel. Remove outdoo r-air opening panel. Save panels and screws. See Fig. 15.

3. Separate hood and screen from basepan by removing the screws and brackets securing them. Save all screws and discard brackets.

4. Replace outdoor air opening panel.

5. Place hood on fr ont of outdo or air open ing panel. See Fig. 16 for hood details. Secure top of hood with the 6 screws removed in Step 3. See Fig. 17.

6. Remove and save 8 screws (4 on each side) from sides of the manual outdo or-air damper.

7. Align screw holes on hood with screw holes on side of manual outdoor-air damper. See Fig. 16 and 17. Secure hood with 8 screws from Step 6.

8. Adjust minimum position setting of the damper blade by adjusting the manual outdoor-air adjustment screws on the fron t of the damper blade. See Fig. 15. Slide blade vertically until it is in the appropriate position determined by Fig. 18. Tighten screws.

9. Remove and save screws currently on sides of hood. Insert screen. Secure screen to hood using the screws. See Fig. 17.

10. Replace filter access panel. Ensure filter acces s panel slides along the tracks and is securely enga ged.

E. Optional EconoMi$er IV

See Fig. 19 for EconoMi$er IV component locations. NOTE: These instructions are for installing the optional

EconoMi$er IV. Refer to the accessory EconoMi$ er IV installation instructions when field installing an EconoMi$er IV accessory.

1. To remove the existing unit filter access panel, raise the panel and swing the bottom outward. The panel is now disengaged from the track and can be removed. See Fig. 20.

Fig. 16 — Outdoor-Air Hood Details

SCREW HOLES (TOP)

HOOD

HOOD SCREEN LOCATION (SCREEN NOT SHOWN)

Fig. 17 — Optional Manual Outdoor-Air

Damper with Hood Attached

FILTER ACCESS PANEL

OUTDOOR AIR OPENING PANEL

SCREWS (SIDE)

MANUAL OUTDOOR-AIR ADJUSTMENT SCREWS

Fig. 15 — Damper Panel with Manual

Outdoor-Air Damper Installed

DAMPER BLADE

Fig. 18 — Outdoor Air Damper Position Setting

—13—

Page 14

2. The box with the economizer hood components is shipped in the compartment behind the economizer. The EconoMi$er IV controller is mounted on top of the EconoMi$er I V in the position shown in Fig. 19. To remove the component box from its shipping position, remove the screw holding the hood b ox bracket to the top of the economizer. Slide the hood box out of the unit. See Fig. 21.

IMPORTANT: If the power exhaust accessory is to be installed on the unit, the hood shipped with the unit will not be used and must be discarded. Save the aluminum filter

for use in the power exhaust hood assembly.

3. The indoor coil access panel will be used as the top of the hood. Remove the screws along the sides an d bottom of the indoor coil access panel. See Fig. 22.

4. Swing out indoor coil access panel and insert the hood sides under the panel (hood top). Use the screws provided to attach the hood sides to the hood top. Use screws provided to attach the hoo d sides to the unit. See Fig. 23.

5. Remove the shipping tape holding the economizer barometric relief damper in place.

6. Insert the hood divider between the hood sides. See Fig. 23 and 24. Secure hood divider with 2 screws on each hood side. The hood di vider is also used as the bottom filter rack for the aluminum filter.

7. Open the filter clips which are located underneath the hood top. Insert the aluminum filter into the bottom filter rack (hood divider). Push the filter into

position past the ope n fil ter cli ps . Clos e th e filt er c lip s to lock the filter into place. See Fig. 24.

8. Caulk the ends of the joint between the unit top panel and the hood top. See Fig. 22.

9. Replace the filter access panel.

10. Install all EconoMi$er IV accessories. EconoMi$er IV wiring is shown in Fig. 25.

Barometric flow capacity is shown in Fig. 26. Outdoor air leakage is shown in Fig. 27. Return air pressure drop is shown in Fig. 28.

F. EconoMi$er IV Standard Sensors

Outdoor Air Temperature (OAT) Sensor The outdoor air temperature sensor (HH57AC074) is a 10 to

20 mA device used to me asure the outdoor-air tempera ture. The outdoor-air tempera ture is used t o determine whe n the EconoMi$er IV can be used for free cooling. The sensor is factory-installed on the EconoMi$er IV in the outdoor airstream. See Fig. 19. The operating range of temperature measurement is 40 to 100 F.

Supply Air Temperature (SAT) Sensor The supply air temperature sensor is a 3 K thermistor

located at the inlet of the indoor f an. See Fig. 29. This sensor is factory installed. The operating range of temperature measurement is 0° to 158 F. See Table 5 for sensor temperature/resistance values.

ECONOMI$ER IV CONTROLLER

WIRING HARNESS

ACTUATOR

OUTSIDE AIR TEMPERATURE SENSOR

LOW AMBIENT SENSOR

Fig. 19 — EconoMi$er IV Component Locations

FILTER ACCESS PANEL

INDOOR COIL ACCESS PANEL

Fig. 21 — Hood Box Removal

CAULK

INDOOR COIL ACCESS PANEL

HERE

HOOD BOX BRACKET

SIDE PANEL

TOP SIDE PANEL

INDOOR COIL ACCESS PANEL

Fig. 20 — Typical Access Panel Locations

Fig. 22 — Indoor Coil Access Panel Relocation

—14—

Page 15

TOP PANEL

INDOOR COIL ACCESS PANEL

22 1/4”

LEFT HOOD SIDE

24 9/16”

HOOD DIVIDER

SCREW

Fig. 23 — Outdoor-Air Hood Construction

40 3/8”

BAROMETRIC RELIEF

FOR OCCUPANCY CONTROL REPLACE JUMPER WITH FIELD-SUPPLIED TIME CLOCK

DIVIDER

OUTSIDE AIR

CLEANABLE ALUMINUM FILTER

FILTER

Fig. 24 — Filter Installation

HOOD

FILTER CLIP

LEGEND

DCV— Demand Controlled Ventilation IAQ — Indoor Air Quality LA — Low Ambient Lockout Device OAT — Outdoor-Air Temperature POT— Potentiometer RAT— Return-Air Temperature

Potentiometer Defaults Settings: Power Exhaust Middle Minimum Pos. Fully Closed DCV Max. Middle DCV Set Middle Enthalpy C Setting

NOTES:

1. 620 ohm, 1 watt 5% resistor should be removed only when using differential enthalpy or dry bulb.

2. If a separate field-supplied 24 v transformer is used for the IAQ sensor power supply, it cannot have the secondary of the transformer grounded.

3. For field-installed remote minimum position POT, remove black wire jumper between P and P1 and set control minimum position POT. to the minimum position.

Fig. 25 — EconoMi$er IV Wiring

—15—

Page 16

2500

2000

1500

1000

500

0.05

FLOW IN CUBIC FEET PER MINUTE (cfm)

STATIC PRESSURE (in. wg)

0.15

Fig. 26 — Barometric Relief Flow Capacity

0.13 0.20 0. 22 0.25 0.30 0. 35 0.40 0.45 0.5 0

FLOW IN CUBIC FEET PER MINUTE (cfm)

STATIC PRESSURE (in. wg)

Fig. 27 — Outdoor Air Damper Leakage

6000

5000

4000

3000

2000

1000

0.05 0.10 0.15 0. 20 0.25 0.30 0.35

FLOW IN CUBIC FEET PER MINUTE (cfm)

STATIC PRESSURE (in. wg)

Fig. 28 — Return Air Pressure Drop

SUPPLY AIR TEMPERATURE SENSOR MOUNTING LOCATION

SUPPLY AIR TEMPERATURE SENSOR

Fig. 29 — Supply Air Sensor Location

0.25

Table 5 — Supply Air Sensor Temperature/Resistance

Values

TEMPERATURE (F) RESISTANCE (ohms)

–58 200,250 –40 100,680 –22 53,010

–4 29,091 14 16,590 32 9,795 50 5,970 68 3,747 77 3,000

86 2,416 104 1,597 122 1,080 140 746 158 525 176 376 185 321 194 274 212 203 230 153 248 116 257 102 266 89 284 70 302 55

The temperature sensor looks like an eyele t terminal with wires running to it. The sensor is located in the “crimp end” and is sealed from moisture.

Outdoor Air Lockout Sensor The Economi$er IV is equipped with an ambient tempera-

ture lockout switch located in the outdoor airstream which is used to lock out the compressors below a 42 F ambient temperature. See Fig. 19.

G. EconoMi$er IV Control Modes

Determine the EconoMi$er IV control mode before set up of the control. Some modes of operation may require different sensors. Refer to Table 6. The EconoMi$er IV is su pplied f rom th e factory with a supply air temperature sensor and an outdoor air temperature sensor. This allows for operation of the EconoMi$er IV with outdoor air dry bulb changeover control. Additional accessories can be added to allow for different types of changeover con tro l and op era ti on of the Econ oMi $e r IV and unit.

Table 6 — EconoMi$er IV Sensor Usage

APPLICATION

ECONOMI$ER IV WITH OUTDOOR AIR

Outdoor Air Dry Bulb

Differential Dry Bulb CRTEMPSN002A00*

Single Enthalpy HH57AC078

Differential Enthalpy

for DCV Control

using a Wall-Mounted

Sensor

for DCV Control

using a Duct-Mounted

Sensor

*CRENTDIF004A00 and CRTEMPSN002A00 accessories are used on

many different base units. As such, these kits may contain parts that will not be needed for installation.

†33ZCSENCO2 is an accessory CO

**33ZCASPCO2 is an accessory aspirator box required for duct-mounted

applications.

††CRCBDIOX005A00 is an accessory that contains both 33ZCSENCO2

and 33ZCASPCO2 accessories.

33ZCSENCO2†

33ZCASPCO2**

DRY BULB SENSOR

Accessories Required

None. The outdoor air dry bulb sensor

is factory installed.

HH57AC078

and

CRENTDIF004A00*

33ZCSENCO2

and

sensor.

CRCBDIOX005A00††

—16—

Page 17

Outdoor Dry Bulb Changeover The standard controller is shipped from the factory configured

for outdoor dry bulb changeover control. The o utdoor air and supply air tempe rature sensor s are included as standard. For this control mode, the outdoor temp erature is compa red to an adjustable set poin t selected on the control. If the outdoo r-air temperature is above the set point, the EconoMi$er IV will adjust the outdoor-air dampers to minimum position. If the outdoor-air temperature is below the s et point, the position of the outdoor-air dampers will be c ontroll ed to provi d e free coo ling using outdoor air. When in this mode, the LED next to the free cooling set point potentiometer will be on. The changeover temperature set point is controlled by the free cooling set point potentiometer located on the cont rol. See Fig. 30. The scale on the potentiometer is A, B, C, and D. See Fig. 31 for the corresponding temperature changeover values.

Differential Dry Bulb Control For differential dry bulb control the standard outdoor dry

bulb sensor is used in conjunction with an additional accessory dry bulb sensor (part number CRTEMPSN002A00). The accessory sensor mu st be mounted in th e return airstream. See Fig. 32. Wiring is provided in th e EconoMi $er IV wirin g harness. See Fig. 25.

In this mode of operation, the outdoor-air temperature is compared to the return-air temperature and the l ower temperature airstream is used for cooling. When using this mode of changeover control, turn the enthalpy set point potentiometer fully clockwise to the D setting. See Fig. 30.

Outdoor Enthalpy Changeover For enthalpy control, accessory enthalpy sensor (part num-

ber HH57AC078) is required. Replace the standard outdoor dry bulb temperature sensor with the accessory enthalpy sensor in the same mou nt ing lo ca tio n . Se e Fig. 19. When the outdoor air enthalpy rises above the outdoor enthalpy changeover set point, the outdoor-air damper moves to its minimum position. The outdoor enthalpy changeover set point is set with the outdoo r enthalpy set point potentiometer on the EconoMi$er IV controller. The set points are A, B, C, and D. See Fig. 33. The factory-installed 620-ohm jumper must be in place across terminals SR and SR+ on the EconoMi$er IV controller. See Fig. 19 and 34.

Differential Enthalpy Control For differential enthalpy control, the EconoMi$er IV control-

ler uses two enthalpy sensors (HH57AC078 and CRENTDIF004A00), one in the outside air and one in the return air duct. The EconoMi$er IV controller compares the outdoor air enthalpy to the return air enthalpy to determine EconoMi$er IV use. The contro ll er selects the lowe r ent halpy air (return or outdoor) for cooling. For example, when the outdoor air has a lower enthalpy than the return air, the EconoMi$er IV opens to b r ing in outdoor air for free cooling.

Replace the standard outsi de air dry bulb tem peratur e sen sor with the accessory enthalpy sensor in the same mounting location. See Fig. 19. Mount the return air enthalpy sensor in the return air duct. See Fig. 32. Wiring is provided in the EconoMi$er IV wiring harness. See Fig. 25. The outdoor enthalpy changeover set point is set with the outdoor enthalpy set point potentiometer on the EconoMi$er IV controller . When using this mode of cha ngeover control, turn the enthalpy setpoint potentiometer fully clockwise to the D setting.

Fig. 30 — EconoMi$er IV Controller Potentiometer

and LED Locations

LED ON

LED OFF

LED ON

LED OFF

DEGREES FAHRENHEIT

LED ON

LED OFF

LED ON

LED OFF

100

Fig. 31 — Outdoor Air Temperature Changeover Set Points

ECONOMI$ER IV CONTROLLER

ECONOMI$ER IV

GROMMET

RETURN AIR SENSOR

RETURN DUCT (FIELD-PROVIDED)

Fig. 32 — Return Air Temperature or

Enthalpy Sensor Mounting Location

—17—

Page 18

Indoor Air Quality (IAQ) Sensor Input

)

The IAQ input can be used for demand control ventilation control based on the l evel of CO

measured in the space or

return air duct. Mount the accessory IAQ sensor according to manufacturer

specifications. Th e IAQ sensor shou ld be wired to the AQ and

AQ1 terminals of the co ntroller. Adjust the DCV poten tiometers to correspond to the DCV vol tage o utput o f the indoor air quality sensor at the user-determined set point. See Fig. 35.

If a separate field-supplied transformer is used to power the IAQ sensor, the sensor must not be grounded or the EconoMi$er IV control board will be damaged.

CONTROL

CURVE

A B C D

CONTROL POINT

APPROX. °F (°C)

AT 50% RH

73 (23) 70 (21) 67 (19) 63 (17)

(4)

35 (2)

—

(29)90(32)95(35)

Y A

(16)

(13)

(10)

(7)

(21)

(18)

(27)

(24)

TIVE HUM

RELA

100

(38)

IDITY

105

110

(41)

(43)

)

AQ1

SO+

SR+

(2)

(4)

(7)

(10)

(13)

(16)

(18)

(21)

(24)

(27)

(29)90(32)95(35)

100 (38)

105

(41)

110

(43)

HIGH LIMIT CURVE

APPROXIMATE DRY BULB TEMPERATURE— °F (°C

Fig. 33 — Enthalpy Changeover Set Points

CO SENSOR MAX RANGE SETTING

TR1

EXH

2V 10V

EXH

Open

2V 10V

DCV

2V 10V

Free Cool

Min Pos

DCV

Max

DCV

Set

24 Vac

Vac

COM

HOT

EF1

6000

5000

4000

3000

2000

1000

RANGE CONFIGURATION (ppm)

DAMPER VOLTAGE FOR MAX VENTILATION RATE

Fig. 35 — CO2 Sensor Maximum Range Setting

800 ppm 900 ppm 1000 ppm 1100 ppm

2345678

Fig. 34 — EconoMi$er IV Control

—18—

Page 19

Exhaust Set Point Adjustment The exhaust set point will determine w hen the exhaust fan

runs based on dam p er position (if acce ssory power exha ust i s installed). The set point is modified with the Exhaust Fan Set Point (EXH SET) potentiometer. See Fig. 30. The set point represents the damper position above which the exhaust fans will be turned on. When there is a call for exhaust, the EconoMi$er IV controller provides a 45 ± 15 second delay before exhaust fan activation to allow the dampers to open. This delay allows the damper to reach the appropriate position to avoid unnecessary fan overload.

Minimum Position Control There is a minimum damper p osition potent iometer on the

EconoMi$er IV c o nt r oll er. See Fig. 30 . Th e minimum damper position maintains the minimum airflow into the building during the occupied period.

When using demand ventilation, the minimum damper position represents the minimum ventilation position for VOC (volatile organic compound) ventilation requirements. The maximum demand ventilation position is used for fully occupied ventilation.

When demand ventilation control is not being used, the minimum position potentiometer should be used to set the occupied ventilation position. The maximum demand ventilation position should be turned fully clockwise.

Adjust the minimum position potentiometer to allow the minimum amount of outdoor air, as required by local codes, to enter the building. Make minimum position adjustments with at least 10 F temperature difference betw een the outdoor and return-air temperatures.

To determine the minimum position setting, perform the following proced ur e :

1. Calculate the appropriate mixed-air temperature using the following formula:

(TO x T

)+ (TR x

100 100

= Outdoor-Air Temperature

) = T

OA = Percent of Outdoor Air TR = Return-Air Temperature RA = Percent of Return Air

= Mixed-Air Temperature

As an example, if local codes require 10% outdoor air during occupied conditions, outdoor-air temperature is 60 F, and return-air temperature is 75 F.

(60 x .10) + (75 x .90) = 73.5 F

2. Disconnect the supply air sensor from terminals T and T1.

3. Ensure that the factory-installed jumper is in place across terminals P and P1. If remote damper positioning is being used, make sure that the terminals are wired accor din g to Fig. 25 and that t he mi nim um position potentiometer is turned fully clockwise.

4. Connect 24 vac across terminals TR and TR1.

5. Carefully adjust th e minim um positi on potent iomet er until the measured mixed-air temperature matches the calculated va lue.

6. Reconnect the supply-air sensor to terminals T and T1.

Remote control of the EconoMi$er IV damper is desirable when requiring additional temporary ventilation. If a field-supplied remote potentiometer (Honeywell part number S963B1128) is wired to the EconoMi$er IV c ont r o lle r, the minimum position of the damper can be controlled from a remote location.

To control the minimum damper position remotely, remove the factory-install ed jumper on the P and P1 terminals on the EconoMi$er IV controller. Wire the field-supplied potentiometer to the P and P1 terminal s on the EconoMi$er IV controller. See Fig. 34.

Damper Movement Damper movement from full open to full closed (or vice

versa) takes 21/2 minutes. Thermostats The EconoMi$er IV control works with conventional thermo-

stats that have a Y1 (cool stage 1), Y2 (cool stage 2), W1 (heat stage 1), W2 (heat stage 2), and G (fan). The EconoMi$er IV control do es not support space temperature sensors. Connections are made at the thermostat terminal connection board located in the main control box.

Occupancy Control The factory default conf igu rat io n for th e Econo Mi $er IV con -

trol is occupied mode. Occupied status is provided by the black jumper from terminal TR to terminal N. When unoccupied mode is desired, install a field-supplied timeclock function in place of th e jumper between TR an d N. See Fig. 25. When the timeclock contacts are closed, the EconoMi$er I V control will be in occupied mode. When the timeclock contacts are open (removin g the 24-v signal from terminal N), the EconoMi$er IV will be in unoccupied mode.

Demand Controlled V enti lation (DCV) When using the EconoMi$er IV for demand controlled venti-

lation, there are some equipment selection criteria which should be considered. When selecting the heat capacity and cool capacity of the equipment, the maximum ventilation rate must be evaluated for design conditio ns. The maximum damper position must be calculated to provide the desired fresh air.

Typically the maximum ventilation rate will be ab out 5 to 10% more than the typical cfm required per person, using normal outside air design criteria.

A proportional anticipatory strategy should be taken with the following conditions: a zone with a large area, varied occupancy, and equipmen t that cannot exceed the req uired ventilation rate at design con diti ons. Exceedin g the req uir ed ventilation rate means the equipment can co ndition air a t a maximum ventilation rate that is greater than the required ventilation rate for maximum occupancy. A proportionalanticipatory strategy will cause the fresh air supplied to increase as the room CO CO

set point has not been reached. By the time the CO

level increases even though the

level reaches the set point, the damper will be at maximum ventilation and should maintain the set point.

In order to have the CO

sensor control the economizer

damper in this manner, first determine the damper voltage output for minimum or base ventilatio n. Base ven tilation is the ventilation required to remove contaminants during unoccupied periods. The following equation may be used to determine the percent of outside-air entering the building for a given damper position. For best results there should be at least a 10 degree difference in outside and return-air temperatures.

(TO x T

)+ (TR x

100 100

= Outdoor-Air Temperature

) = T

OA = Percent of Outdoor Air

= Return-Air Temperature

RA = Percent of Return Air

= Mixed-Air Temperature

—19—

Page 20

Once base ventilation has been determined, set the minimum damper position potentiometer to the correct position.

The same equation can be used to determine the occupied or maximum ventilation rate to the building. For example, an output of 3.6 volts t o the ac tuat o r pro vide s a ba se ve ntil at io n rate of 5% and an output of 6.7 volts provides the maximum ventilation rate of 20% (or bas e plu s 15 cfm pe r pers on). Use Fig. 35 to determine the maximum setting of the CO

sensor.

For example, a 1100 ppm set point relates to a 15 cfm per person design. Use the 1100 ppm curve on Fig. 35 to find the point when the CO

sensor output will be 6.7 volts. Line up

the point on the graph with the left side of the chart to determine that the range configuration for the CO

sensor should

be 1800 ppm. The EconoMi$er IV controller will output the

6.7 volts fro m the CO

sensor to the actuator when the CO

concentration in th e sp ace is a t 11 00 ppm. Th e DCV se t point may be left at 2 volts since the CO

sensor voltage wi ll be

ignored by the Econ oMi$er IV co ntroller unti l it rises a bove the 3.6 volt setting of the minimum position potentiometer.

Once the fully occupied damper position has been determined, set the maximu m da mpe r de ma nd co nt ro l ve nt il atio n potentiometer to this position. Do not set to the maximum position as this can result in over-ventilation to the space and potential high-humidity levels.

Sensor Con figuration

The CO2 sensor has preset standard voltage settings that can be selected anytime afte r the sensor is powere d up. See Table 7.

Use setting 1 or 2 f or Bryant equipment. See Table 7.

1. Press Clear and Mode buttons. Hold at least 5 seconds until the sensor enters the Edit mode.

2. Press Mode twice. The STDSET Menu will appear.

3. Use the Up/Down button to select the preset number. See Table 7.

4. Press Enter to lock in the selection.

5. Press Mode to exit and resume normal operation.

The custom settings of the CO

sensor can be changed any-

time after the sensor is en ergized. Follow the steps belo w to change the non-standard settings:

1. Press Clear and Mode buttons. Hold at least 5 seconds until the sensor enters the Edit mode.

2. Press Mode twice. The STDSET Menu will appear.

3. Use the Up/Down button to toggle to the NONSTD menu and press Enter.

4. Use the Up/Down button to toggle through each of the nine variables, starting with Altitude, until the desired setting is reached.

5. Press Mode to move through the variables.

6. Press Enter to lock in the selection, then press Mode to continue to the next variable.

Dehumidification of Fresh Air with DCV Control Information from ASHRAE indicates that the largest humid-

ity load on any zone is the fresh air introduced. For some applications, an energy recovery unit is added to reduce the moisture content of the fresh air being brought into the building when th e enthalpy is h igh. In most case s, the normal heating and co oling proc esse s are m ore tha n ade quate to remove the humidity loads for most commercial applications.

If normal roof top heating and cooling operation is not adequate for the outdoor humidity level, an energy recovery unit and/or a dehumidification opt ion should be considered.

Table 7 — CO

SETTING EQUIPMENT OUTPUT

Interface w/Standard

2 Proportional Any

Building Control System

3 Exponential Any

5 Proportional 20

Economizer

6 Exponential 15

7 Exponential 20

8 Health & Safety Proportional —

Parking/Air Intakes/

Loading Docks

LEGEND

ppm — Parts Per Million

Proportional Any

Proportional 15

Proportional —

Sensor Standard Settings

VENTILATION

RATE

(cfm/Person)

ANALOG

OUTPUT

0-10V

4-20 mA

2-10V

7-20 mA

0-10V

4-20 mA

0-10V

4-20 mA

0-10V

4-20 mA

0-10V

4-20 mA

0-10V

4-20 mA

0-10V

4-20 mA

0-10V

4-20 mA

CONTROL RANGE

(ppm)

0-2000 1000 50

0-2000 1100 50

0-1100 1100 50

0- 900 900 50

0-1100 1100 50

0- 900 900 50

0-9999 5000 500

0-2000 700 50

OPTIONAL

RELAY SETPOINT

(ppm)

RELAY

HYSTERESIS

(ppm)

—20—

Page 21

VII. STEP 7 — ADJUST EVAPORATOR-FAN SPEED

Adjust evaporator-fan rpm to meet jobsite conditions. For units with electric heat, required minimum cfm is 2250

for 551B090 and 102 and 3000 for 551B120 and 150. See Table 8 for exceptions.

Table 8 — Minimum Required Airflow Exceptions

UNIT 551B

120,150

090-150 575

UNIT

VO LTAGE

208/230 42.4 Horizontal 3200 208/230 50.0 Horizontal 3200

460 50.0

HEATER

17.0

34.0 2350

UNIT

CONFIG-

URATION

Horizontal or Vertical

REQUIRED

MINIMUM

CFM

3200

2800

Tables 9 and 10 show fan rpm at motor pulley settings for standard and high-static motors. Tables 11 and 12 show evaporator-fan motor data. See Tables 13 and 14 and Fig. 36 for accessory and option static pressure drops. Refer to Tables 15-28 to determine fan speed settings.

Fan motor pulleys are factory set for speed shown in Table 1. To change fan speeds:

1. Shut off unit power supply and install lockout tag.

2. Loosen belt by loosening fan motor mounting nuts. See Fig. 37 and 38.

3. Loosen movable pulley flange setscrew (see Fig. 39).

4. Screw movable flange toward fixed flange to increase rpm or away from fixed flange to decrease rpm. Increasing fa n rpm increases load on motor. Do not exceed maximum speed specified in Table 1.

5. Set movable flange at nearest keyway of pulley hub and tighten setscrew. (See Table 1 for speed change for each full turn of pulley flange.)

To align fan and motor pulleys:

1. Loosen fan pulley setscrews.

2. Slide fan pulley along fan shaft.

3. Make angular alignment by loosening motor from mounting plate.

To adjust belt tension:

1. Loosen fan motor mounting nuts.

2. Size 090 — Slide motor moun ting plate away from fan scroll for proper belt tension (

/2-in. deflection with 8 to 10 lb of force) and tighten mounting nuts (see Fig. 37).

Sizes 102-150 — Slide motor mounting plate downward to tighten belt tension. Secure motor mounting plate nuts. Se e Fi g. 38. Use

/2-in. deflection with 10 lb of

force.

3. Adjust bolt and nut on mounting plate to secure motor in fixed position.

MOTOR MOUNTING

PLATE NUTS

Fig. 37 — Typical Belt-Drive Motor Mounting for

Size 090

0.35

0.3

0.25

0.2

0.15

DELTA P IN. WG

0.1

0.05

1000

Fig. 36 — Perfect Humidity™ Dehumidification System Static Pressure Drop (in. wg)

2000

3000

CFM

—21—

4000

5000

7.5 ton

8.5, 10 & 12.5 ton

6000

Page 22

Fig. 38 — Typical Belt-Drive Motor Mounting for

Sizes 102-150

Table 9 — Fan Rpm at Motor Pulley Setting*; Standard Motor/Drive

Fig. 39 — Indoor-Fan Pulley Adjustment

UNIT 551B

MOTOR PULLEY TURNS OPEN

090,102 1085 1060 1035 1010 985 960 935 910 890 865 840 — —

120 1080 1060 1035 1015 990 970 950 925 905 880 860 — — 150 1130 1112 1087 1062 1037 1212 987 962 937 912 887 862 830

*Approximate fan rpm shown.

Table 10 — Fan Rpm at Motor Pulley Setting*; High-Static Motor/Drive

UNIT 551B

090 1080 1025 1007 988 970 952 933 915 897 878 860 — — 102 1080 1025 1007 988 970 952 933 915 897 878 860 — — 120 1130 1112 1087 1062 1037 1212 987 962 937 912 887 862 830

*Approximate fan rpm shown.

MOTOR PULLEY TURNS OPEN

Table 11 — Evaporator-Fan Motor Data — Standard Motor

UNIT 551B

090,102 Three 2.90 2615

120 Three 3.70 3775

150 Three 5.25 4400

LEGEND

BHP — Brake Horsepower

*Extensive motor and electrical testing on these units ensures that the full horsepower and watts range

of the motors can be utilized with confidence. Using your fan motors up to the ratings shown in this table will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected.

UNIT

PHASE

MAXIMUM

CONTINUOUS BHP*

MAXIMUM

OPERATING WATTS*

UNIT VOLTAGE

208/230 8.6

460 3.9 575 3.9

208/230 12.2

460 5.5 575 5.5

208/230 17.3

460 8.5 575 8.5

MAXIMUM

AMP DRAW

—22—

Page 23

Table 12 — Evaporator-Fan Motor Data — High-Static Motors

UNIT

5551B

090,102 Three 4.20 3775

120 Three 5.25 4400

LEGEND

BHP — Brake Horsepower

*Extensive motor and electrical testing on these units ensures that the full horsepower and watts range

UNIT

PHASE

MAXIMUM

CONTINUOUS BHP*

MAXIMUM

OPERATING WATTS*

UNIT VOLTAGE

208/230 12.2

460 5.5 575 5.5

208/230 17.3

460 8.5 575 8.5

MAXIMUM

AMP DRAW

Table 13 — Accessory/FIOP EconoMi$er IV Static Pressure* (in. wg)

COMPONENT

Vertical EconoMi$er IV 0.06 0.075 0.09 0.115 0.13 0.15 0.17 0.195 0.22 0.25 0.285 0.325 0.36 — Horizontal EconoMi$er IV — 0.1 0.125 0.15 0.18 0.21 0.25 0.275 0.3 0.34 0.388 — — —

LEGEND FIOP — Factory-Installed Option

*The static pressure must be added to external static pressure. The sum and the evaporator entering-

air cfm should be used in conjunction with the Fan Performance tables to determine indoor blower rpm and watts.

2250 2500 2750 3000 3250 3500 3750 4000 4250 4500 4750 5000 5250 6250

CFM

Table 14 — Accessory/FIOP Electric Heaters Static Pressure (in. wg)

COMPONENT

1 Heater Module 0.02 0.03 0.05 0.065 0.08 0.10 0.12 0.14 0.155

2 Heater Modules 0.03 0.05 0.07 0.09 0.12 0.14 0.16 0.19 0.21

LEGEND FIOP — Factory-Installed Option

*The static pressure must be added to external static pressure. The sum and the evaporator entering-air cfm should

be used in conjunction with the Fan Performance tables to determine indoor blower rpm and watts.

2200 2500 3000 3500 4000 4500 5000 5500 6000

GENERAL FAN PERFORMANCE NOTES

1. Extensive motor and electrical testing on these units ensures that the full range of the motor can be utilized with confidence. Using fan motors up to the ratings shown will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected. For additional information on motor performance refer to Evaporator-Fan Motor Data, Tables 11 and 12.

CFM

2. Values include losses for filters, unit casing, and wet coils. See Tables 13 and 14 and Fig. 36 for accessory/FIOP static pressure information.

3. Use of a field-supplied motor may affect wire sizing. Contact Bryant representative to verify.

4. Interpolation is permissible. Do not extrapolate.

—23—

Page 24

Table 15 — Fan Performance 551B090 — Vertical Discharge Units; Standard Motor (Belt Drive)*

AIRFLOW

CFM

2250 511 0.53 492 591 0.73 680 660 0.95 885 722 1.19 1106 779 1.44 1342 2300 519 0.56 518 597 0.76 709 666 0.98 916 727 1.22 1140 784 1.48 1378 2400 534 0.61 571 611 0.82 768 678 1.05 982 739 1.30 1210 795 1.56 1453 2500 550 0.67 629 624 0.89 832 690 1.13 1051 750 1.38 1285 805 1.64 1533 2550 558 0.71 660 631 0.93 866 697 1.17 1088 756 1.42 1324 811 1.69 1574 2600 565 0.74 691 638 0.97 901 703 1.21 1125 762 1.46 1365 816 1.73 1617 2700 581 0.81 758 652 1.04 974 716 1.29 1204 774 1.55 1449 828 1.83 1707 2800 597 0.89 829 667 1.13 1051 729 1.38 1287 786 1.65 1538 839 1.93 1801 2900 613 0.97 905 681 1.22 1133 742 1.48 1376 799 1.75 1632 851 2.04 1900 3000 630 1.06 985 696 1.31 1220 756 1.58 1469 811 1.86 1731 863 2.15 2004 3100 646 1.15 1071 711 1.41 1313 770 1.68 1568 824 1.97 1835 875 2.27 2114 3200 663 1.25 1162 726 1.51 1411 784 1.79 1672 837 2.09 1944 888 2.39 2229 3300 679 1.35 1259 741 1.62 1514 798 1.91 1781 851 2.21 2060 900 2.52 2351 3400 696 1.46 1361 756 1.74 1623 812 2.03 1896 864 2.34 2181 913 2.66 2478 3500 713 1.58 1469 772 1.86 1737 827 2.16 2017 878 2.48 2308 926 2.80 2610 3600 729 1.70 1583 787 1.99 1857 841 2.30 2144 892 2.62 2441 — — — 3700 746 1.83 1703 803 2.13 1985 856 2.44 2277 906 2.77 2580 — — — 3750 755 1.89 1766 811 2.20 2051 864 2.52 2346 913 2.84 2653 — — —

AIRFLOW

CFM

2250 832 1.71 1592 882 1.99 1855 928 2.29 2131 973 2.59 2420 — — — 2300 837 1.75 1630 886 2.03 1896 933 2.33 2174 977 2.64 2463 — — — 2400 847 1.83 1710 896 2.12 1980 942 2.43 2262 986 2.74 2556 — — — 2500 857 1.92 1794 905 2.22 2069 951 2.52 2355 995 2.84 2653 — — — 2550 862 1.97 1838 910 2.27 2114 956 2.58 2403 999 2.90 2704 — — — 2600 867 2.02 1884 915 2.32 2162 961 2.63 2453 — ————— 2700 878 2.12 1978 926 2.42 2261 971 2.74 2556 — ————— 2800 889 2.23 2077 936 2.54 2365 981 2.86 2664 — ————— 2900 900 2.34 2181 947 2.65 2474 ————————— 3000 912 2.46 2290 958 2.78 2588 ————————— 3100 923 2.58 2406 969 2.90 2708 ————————— 3200 935 2.71 2526 ———————————— 3300 947 2.84 2652 ———————————— 3400 ——————————————— 3500 ——————————————— 3600 ——————————————— 3700 ——————————————— 3750 ———————————————

Bhp — Brake Horsepower Input to Fan Watts — Input Watts to Motor

*Motor drive range: 840 to 1085 rpm. All other rpms require field-

supplied drive.

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

LEGEND

0.2 0.4 0.6 0.8 1.0

1.2 1.4 1.6 1.8 2.0

EXTERNAL STATIC PRESSURE (in. wg)

NOTES:

1. Boldface indicates field-supplied drive is required.

2. Maximum continuous bhp is 2.90.

3. See page 23 for general fan performance notes.

—24—

Page 25

Table 16 — Fan Performance 551B090 — Vertical Discharge Units; High-Static Motor (Belt Drive)*

AIRFLOW

CFM

2250 511 0.53 492 591 0.73 680 660 0.95 885 722 1.19 1106 779 1.44 1342 2300 519 0.56 518 597 0.76 709 666 0.98 916 727 1.22 1140 784 1.48 1378 2400 534 0.61 571 611 0.82 768 678 1.05 982 739 1.30 1210 795 1.56 1453 2500 550 0.67 629 624 0.89 832 690 1.13 1051 750 1.38 1285 805 1.64 1533 2550 558 0.71 660 631 0.93 866 697 1.17 1088 756 1.42 1324 811 1.69 1574 2600 565 0.74 691 638 0.97 901 703 1.21 1125 762 1.46 1365 816 1.73 1617 2700 581 0.81 758 652 1.04 974 716 1.29 1204 774 1.55 1449 828 1.83 1707 2800 597 0.89 829 667 1.13 1051 729 1.38 1287 786 1.65 1538 839 1.93 1801 2900 613 0.97 905 681 1.22 1133 742 1.48 1376 799 1.75 1632 851 2.04 1900 3000 630 1.06 985 696 1.31 1220 756 1.58 1469 811 1.86 1731 863 2.15 2004 3100 646 1.15 1071 711 1.41 1313 770 1.68 1568 824 1.97 1835 875 2.27 2114 3200 663 1.25 1162 726 1.51 1411 784 1.79 1672 837 2.09 1944 888 2.39 2229 3300 679 1.35 1259 741 1.62 1514 798 1.91 1781 851 2.21 2060 900 2.52 2351 3400 696 1.46 1361 756 1.74 1623 812 2.03 1896 864 2.34 2181 913 2.66 2478 3500 713 1.58 1469 772 1.86 1737 827 2.16 2017 878 2.48 2308 926 2.80 2610 3600 729 1.70 1583 787 1.99 1857 841 2.30 2144 892 2.62 2441 939 2.95 2749 3700 746 1.83 1703 803 2.13 1985 856 2.44 2277 906 2.77 2580 953 3.10 2894 3750 755 1.89 1766 811 2.20 2051 864 2.52 2346 913 2.84 2653 959 3.18 2969

AIRFLOW

CFM

2250 832 1.71 1592 882 1.99 1855 928 2.29 2131 973 2.59 2420 1015 2.92 2720 2300 837 1.75 1630 886 2.03 1896 933 2.33 2174 977 2.64 2463 1020 2.97 2766 2400 847 1.83 1710 896 2.12 1980 942 2.43 2262 986 2.74 2556 1028 3.07 2861 2500 857 1.92 1794 905 2.22 2069 951 2.52 2355 995 2.84 2653 1037 3.18 2962 2550 862 1.97 1838 910 2.27 2114 956 2.58 2403 999 2.90 2704 1041 3.23 3014 2600 867 2.02 1884 915 2.32 2162 961 2.63 2453 1004 2.95 2755 1045 3.29 3068 2700 878 2.12 1978 926 2.42 2261 971 2.74 2556 1013 3.07 2862 1055 3.41 3180 2800 889 2.23 2077 936 2.54 2365 981 2.86 2664 1023 3.19 2975 1064 3.54 3297 2900 900 2.34 2181 947 2.65 2474 991 2.98 2778 1033 3.32 3094 1073 3.67 3419 3000 912 2.46 2290 958 2.78 2588 1001 3.11 2897 1043 3.45 3217 1083 3.80 3547 3100 923 2.58 2406 969 2.90 2708 1012 3.24 3022 1053 3.59 3347 1093 3.95 3682 3200 935 2.71 2526 980 3.04 2834 1023 3.38 3152 1064 3.73 3482 1103 4.10 3821 3300 947 2.84 2652 992 3.18 2966 1034 3.53 3289 1075 3.89 3623 — — — 3400 959 2.99 2785 1003 3.33 3103 1045 3.68 3432 1086 4.04 3771 ——— 3500 972 3.13 2923 1015 3.48 3246 1057 3.84 3581 — ————— 3600 984 3.29 3068 1027 3.64 3396 1068 4.01 3736 — ————— 3700 997 3.45 3218 1040 3.81 3553 1080 4.18 3897 — ————— 3750 1004 3.54 3296 1046 3.90 3633 —————————

Bhp — Brake Horsepower Input to Fan Watts — Input Watts to Motor

*Motor drive range: 860 to 1080 rpm. All other rpms require field-

supplied drive.

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

LEGEND

0.2 0.4 0.6 0.8 1.0

1.2 1.4 1.6 1.8 2.0

EXTERNAL STATIC PRESSURE (in. wg)

NOTES:

1. Boldface indicates field-supplied drive is required.

2. Maximum continuous bhp is 4.20.

3. See page 23 for general fan performance notes.

—25—

Page 26

Table 17 — Fan Performance 551B102 — Vertical Discharge Units; Standard Motor (Belt Drive)*

AIRFLOW

CFM

2500 489 0.41 386 564 0.54 506 629 0.67 625 688 0.80 745 741 0.93 866 2600 502 0.45 424 576 0.59 548 640 0.72 672 697 0.85 797 750 0.99 923 2700 515 0.50 465 587 0.64 594 650 0.77 723 707 0.91 852 760 1.05 982 2800 529 0.55 508 599 0.69 642 661 0.83 776 718 0.98 910 769 1.12 1044 2900 542 0.59 555 611 0.74 693 672 0.89 832 728 1.04 970 779 1.19 1109 3000 556 0.65 604 623 0.80 748 684 0.95 891 738 1.11 1034 789 1.26 1177 3100 569 0.70 656 636 0.86 805 695 1.02 953 749 1.18 1100 799 1.34 1249 3200 583 0.76 712 648 0.93 865 707 1.09 1018 760 1.26 1170 809 1.42 1323 3300 597 0.83 770 661 1.00 929 718 1.17 1086 771 1.33 1244 820 1.50 1401 3400 611 0.89 832 674 1.07 996 730 1.24 1158 782 1.42 1320 831 1.59 1483 3500 625 0.96 898 687 1.14 1066 742 1.32 1233 794 1.50 1400 841 1.68 1567 3600 639 1.04 967 700 1.22 1140 754 1.41 1312 805 1.59 1484 852 1.78 1656 3700 654 1.11 1040 713 1.31 1218 767 1.50 1395 817 1.69 1571 863 1.87 1748 3800 668 1.20 1116 726 1.39 1299 779 1.59 1481 828 1.78 1662 874 1.98 1844 3900 683 1.28 1197 739 1.48 1385 792 1.69 1572 840 1.88 1758 886 2.08 1943 4000 697 1.37 1281 753 1.58 1474 804 1.79 1666 852 1.99 1857 897 2.20 2048 4100 712 1.47 1370 766 1.68 1567 817 1.89 1764 864 2.10 1960 909 2.31 2155 4200 726 1.57 1462 780 1.79 1665 830 2.00 1866 876 2.22 2067 920 2.43 2268 4300 741 1.67 1559 794 1.89 1767 843 2.12 1973 889 2.34 2179 932 2.56 2384

AIRFLOW

CFM

2500 791 1.06 988 837 1.19 1112 881 1.33 1236 922 1.46 1362 962 1.60 1490 2600 799 1.12 1049 845 1.26 1177 889 1.40 1306 930 1.54 1436 969 1.68 1568 2700 808 1.19 1113 854 1.34 1245 897 1.48 1378 938 1.62 1513 977 1.77 1648 2800 817 1.26 1179 863 1.41 1316 905 1.56 1454 946 1.71 1592 985 1.86 1732 2900 827 1.34 1249 872 1.49 1390 914 1.64 1532 954 1.80 1675 993 1.95 1819 3000 836 1.42 1322 881 1.57 1467 923 1.73 1613 963 1.89 1761 1001 2.05 1909 3100 846 1.50 1398 890 1.66 1547 932 1.82 1698 972 1.98 1849 1010 2.15 2002 3200 856 1.58 1477 899 1.75 1631 941 1.92 1786 980 2.08 1942 1018 2.25 2099 3300 866 1.67 1559 909 1.84 1718 950 2.01 1878 989 2.19 2038 1027 2.36 2199 3400 876 1.76 1645 919 1.94 1808 960 2.12 1972 998 2.29 2137 1036 2.47 2303 3500 886 1.86 1734 929 2.04 1902 969 2.22 2071 1008 2.40 2240 1045 2.58 2410 3600 897 1.96 1827 939 2.14 2000 979 2.33 2173 1017 2.52 2347 1054 2.70 2521 3700 907 2.06 1924 949 2.25 2101 989 2.44 2279 1027 2.63 2457 1063 2.83 2636 3800 918 2.17 2025 959 2.37 2207 999 2.56 2389 1036 2.76 2571 — — — 3900 929 2.28 2130 970 2.48 2316 1009 2.68 2502 1046 2.88 2690 — — — 4000 940 2.40 2238 980 2.61 2429 1019 2.81 2620 — ————— 4100 951 2.52 2351 991 2.73 2547 ————————— 4200 962 2.65 2468 1002 2.86 2668 ————————— 4300 973 2.78 2589 ————————————

Bhp — Brake Horsepower Input to Fan Watts — Input Watts to Motor

*Motor drive range: 840 to 1085 rpm. All other rpms require field-

supplied drive.

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

LEGEND

0.2 0.4 0.6 0.8 1.0

1.2 1.4 1.6 1.8 2.0

EXTERNAL STATIC PRESSURE (in. wg)

NOTES:

1. Boldface indicates field-supplied drive is required.

2. Maximum continuous bhp is 2.90.

3. See page 23 for general fan performance notes.

—26—

Page 27

Table 18 — Fan Performance 551B102 — Vertical Discharge Units; High-Static Motor (Belt Drive)*

AIRFLOW

CFM

AIRFLOW

CFM

2500 791 1.06 988 837 1.19 1112 881 1.33 1236 922 1.46 1362 962 1.60 1490 2600 799 1.12 1049 845 1.26 1177 889 1.40 1306 930 1.54 1436 969 1.68 1568 2700 808 1.19 1113 854 1.34 1245 897 1.48 1378 938 1.62 1513 977 1.77 1648 2800 817 1.26 1179 863 1.41 1316 905 1.56 1454 946 1.71 1592 985 1.86 1732 2900 827 1.34 1249 872 1.49 1390 914 1.64 1532 954 1.80 1675 993 1.95 1819 3000 836 1.42 1322 881 1.57 1467 923 1.73 1613 963 1.89 1761 1001 2.05 1909 3100 846 1.50 1398 890 1.66 1547 932 1.82 1698 972 1.98 1849 1010 2.15 2002 3200 856 1.58 1477 899 1.75 1631 941 1.92 1786 980 2.08 1942 1018 2.25 2099 3300 866 1.67 1559 909 1.84 1718 950 2.01 1878 989 2.19 2038 1027 2.36 2199 3400 876 1.76 1645 919 1.94 1808 960 2.12 1972 998 2.29 2137 1036 2.47 2303 3500 886 1.86 1734 929 2.04 1902 969 2.22 2071 1008 2.40 2240 1045 2.58 2410 3600 897 1.96 1827 939 2.14 2000 979 2.33 2173 1017 2.52 2347 1054 2.70 2521 3700 907 2.06 1924 949 2.25 2101 989 2.44 2279 1027 2.63 2457 1063 2.83 2636 3800 918 2.17 2025 959 2.37 2207 999 2.56 2389 1036 2.76 2571 1073 2.95 2755 3900 929 2.28 2130 970 2.48 2316 1009 2.68 2502 1046 2.88 2690 1082 3.09 2877 4000 940 2.40 2238 980 2.61 2429 1019 2.81 2620 1056 3.02 2812 1092 3.22 3004 4100 951 2.52 2351 991 2.73 2547 1029 2.94 2743 1066 3.15 2939 1102 3.36 3136 4200 962 2.65 2468 1002 2.86 2668 1040 3.08 2869 1076 3.29 3070 1112 3.51 3271 4300 973 2.78 2589 1013 3.00 2794 1050 3.22 2999 1087 3.44 3205 1122 3.66 3411

Bhp — Brake Horsepower Input to Fan Watts — Input Watts to Motor

*Motor drive range: 860 to 1080 rpm. All other rpms require field-

supplied drive.

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

LEGEND

0.2 0.4 0.6 0.8 1.0

1.2 1.4 1.6 1.8 2.0

EXTERNAL STATIC PRESSURE (in. wg)

NOTES:

1. Boldface indicates field-supplied drive is required.

2. Maximum continuous bhp is 4.20.

3. See page 23 for general fan performance notes.

—27—

Page 28

Table 19 — Fan Performance 551B120 — Vertical Discharge Units; Standard Motor (Belt Drive*

AIRFLOW

CFM

3000 556 0.65 604 623 0.80 748 684 0.95 891 738 1.11 1034 789 1.26 1177 3100 569 0.70 656 636 0.86 805 695 1.02 953 749 1.18 1100 799 1.34 1249 3200 583 0.76 712 648 0.93 865 707 1.09 1018 760 1.26 1170 809 1.42 1323 3300 597 0.83 770 661 1.00 929 718 1.17 1086 771 1.33 1244 820 1.50 1401 3400 611 0.89 832 674 1.07 996 730 1.24 1158 782 1.42 1320 831 1.59 1483 3500 625 0.96 898 687 1.14 1066 742 1.32 1233 794 1.50 1400 841 1.68 1567 3600 639 1.04 967 700 1.22 1140 754 1.41 1312 805 1.59 1484 852 1.78 1656 3700 654 1.11 1040 713 1.31 1218 767 1.50 1395 817 1.69 1571 863 1.87 1748 3800 668 1.20 1116 726 1.39 1299 779 1.59 1481 828 1.78 1662 874 1.98 1844 3900 683 1.28 1197 739 1.48 1385 792 1.69 1572 840 1.88 1758 886 2.08 1943 4000 697 1.37 1281 753 1.58 1474 804 1.79 1666 852 1.99 1857 897 2.20 2048 4100 712 1.47 1370 766 1.68 1567 817 1.89 1764 864 2.10 1960 909 2.31 2155 4200 726 1.57 1462 780 1.79 1665 830 2.00 1866 876 2.22 2067 920 2.43 2268 4300 741 1.67 1559 794 1.89 1767 843 2.12 1973 889 2.34 2179 932 2.56 2384 4400 755 1.78 1660 807 2.01 1873 856 2.23 2084 901 2.46 2295 944 2.69 2505 4500 770 1.89 1766 821 2.13 1984 869 2.36 2200 914 2.59 2415 956 2.82 2630 4600 785 2.01 1876 835 2.25 2099 882 2.49 2320 926 2.72 2541 968 2.96 2760 4700 800 2.14 1991 849 2.38 2219 895 2.62 2445 939 2.86 2670 980 3.10 2895 4800 815 2.26 2111 863 2.51 2344 909 2.76 2575 952 3.01 2805 993 3.25 3034 4900 829 2.40 2235 877 2.65 2473 922 2.91 2709 965 3.16 2944 1005 3.41 3178 5000 844 2.54 2365 891 2.80 2608 936 3.06 2849 978 3.31 3089 1018 3.57 3328

AIRFLOW

CFM

3000 836 1.42 1322 881 1.57 1467 923 1.73 1613 963 1.89 1761 1001 2.05 1909 3100 846 1.50 1398 890 1.66 1547 932 1.82 1698 972 1.98 1849 1010 2.15 2002 3200 856 1.58 1477 899 1.75 1631 941 1.92 1786 980 2.08 1942 1018 2.25 2099 3300 866 1.67 1559 909 1.84 1718 950 2.01 1878 989 2.19 2038 1027 2.36 2199 3400 876 1.76 1645 919 1.94 1808 960 2.12 1972 998 2.29 2137 1036 2.47 2303 3500 886 1.86 1734 929 2.04 1902 969 2.22 2071 1008 2.40 2240 1045 2.58 2410 3600 897 1.96 1827 939 2.14 2000 979 2.33 2173 1017 2.52 2347 1054 2.70 2521 3700 907 2.06 1924 949 2.25 2101 989 2.44 2279 1027 2.63 2457 1063 2.83 2636 3800 918 2.17 2025 959 2.37 2207 999 2.56 2389 1036 2.76 2571 1073 2.95 2755 3900 929 2.28 2130 970 2.48 2316 1009 2.68 2502 1046 2.88 2690 1082 3.09 2877 4000 940 2.40 2238 980 2.61 2429 1019 2.81 2620 1056 3.02 2812 1092 3.22 3004 4100 951 2.52 2351 991 2.73 2547 1029 2.94 2743 1066 3.15 2939 1102 3.36 3136 4200 962 2.65 2468 1002 2.86 2668 1040 3.08 2869 1076 3.29 3070 1112 3.51 3271 4300 973 2.78 2589 1013 3.00 2794 1050 3.22 2999 1087 3.44 3205 1122 3.66 3411 4400 985 2.91 2715 1024 3.14 2924 1061 3.36 3134 1097 3.59 3345 ——— 4500 996 3.05 2845 1035 3.28 3059 1072 3.51 3274 — ————— 4600 1008 3.20 2979 1046 3.43 3199 1083 3.67 3418 —————— 4700 1020 3.34 3119 1058 3.58 3343 ————————— 4800 1032 3.50 3263 ———————————— 4900 1044 3.66 3413 ———————————— 5000 ———————————————

Bhp — Brake Horsepower Input to Fan Watts — Input Watts to Motor

*Motor drive range: 860 to 1080 rpm. All other rpms require field-

supplied drive.

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

LEGEND

0.2 0.4 0.6 0.8 1.0

1.2 1.4 1.6 1.8 2.0

EXTERNAL STATIC PRESSURE (in. wg)

NOTES:

1. Boldface indicates field-supplied drive is required.

2. Maximum continuous bhp is 3.70.

3. See page 23 for general fan performance notes.

—28—

Page 29

Table 20 — Fan Performance 551B120 — Vertical Discharge Units; High-Static Motor (Belt Drive)*

AIRFLOW

CFM

AIRFLOW

CFM

3000 836 1.42 1322 881 1.57 1467 923 1.73 1613 963 1.89 1761 1001 2.05 1909 3100 846 1.50 1398 890 1.66 1547 932 1.82 1698 972 1.98 1849 1010 2.15 2002 3200 856 1.58 1477 899 1.75 1631 941 1.92 1786 980 2.08 1942 1018 2.25 2099 3300 866 1.67 1559 909 1.84 1718 950 2.01 1878 989 2.19 2038 1027 2.36 2199 3400 876 1.76 1645 919 1.94 1808 960 2.12 1972 998 2.29 2137 1036 2.47 2303 3500 886 1.86 1734 929 2.04 1902 969 2.22 2071 1008 2.40 2240 1045 2.58 2410 3600 897 1.96 1827 939 2.14 2000 979 2.33 2173 1017 2.52 2347 1054 2.70 2521 3700 907 2.06 1924 949 2.25 2101 989 2.44 2279 1027 2.63 2457 1063 2.83 2636 3800 918 2.17 2025 959 2.37 2207 999 2.56 2389 1036 2.76 2571 1073 2.95 2755 3900 929 2.28 2130 970 2.48 2316 1009 2.68 2502 1046 2.88 2690 1082 3.09 2877 4000 940 2.40 2238 980 2.61 2429 1019 2.81 2620 1056 3.02 2812 1092 3.22 3004 4100 951 2.52 2351 991 2.73 2547 1029 2.94 2743 1066 3.15 2939 1102 3.36 3136 4200 962 2.65 2468 1002 2.86 2668 1040 3.08 2869 1076 3.29 3070 1112 3.51 3271 4300 973 2.78 2589 1013 3.00 2794 1050 3.22 2999 1087 3.44 3205 1122 3.66 3411 4400 985 2.91 2715 1024 3.14 2924 1061 3.36 3134 1097 3.59 3345 1132 3.81 3555 4500 996 3.05 2845 1035 3.28 3059 1072 3.51 3274 1108 3.74 3489 1142 3.97 3704 4600 1008 3.20 2979 1046 3.43 3199 1083 3.67 3418 1118 3.90 3638 1152 4.14 3857 4700 1020 3.34 3119 1058 3.58 3343 1094 3.83 3567 1129 4.07 3792 1163 4.31 4016 4800 1032 3.50 3263 1069 3.74 3492 1105 3.99 3721 1140 4.24 3950 1174 4.48 4179 4900 1044 3.66 3413 1081 3.91 3646 1117 4.16 3880 1151 4.41 4113 1184 4.66 4347 5000 1056 3.82 3566 1093 4.08 3805 1128 4.34 4044 1162 4.59 4282 1195 4.85 4520

Bhp — Brake Horsepower Input to Fan Watts — Input Watts to Motor

*Motor drive range: 830 to 1130 rpm. All other rpms require field-

supplied drive.

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

LEGEND

0.2 0.4 0.6 0.8 1.0

1.2 1.4 1.6 1.8 2.0

EXTERNAL STATIC PRESSURE (in. wg)

NOTES:

1. Boldface indicates field-supplied drive is required.

2. Maximum continuous bhp is 5.25.

3. See page 23 for general fan performance notes.

—29—

Page 30

Table 21 — Fan Performance 551B150 — Vertical Discharge Units; Standard Motor (Belt Drive)*

AIRFLOW

CFM

3700 654 1.11 1040 713 1.31 1218 767 1.50 1395 817 1.69 1571 863 1.87 1748 3800 668 1.20 1116 726 1.39 1299 779 1.59 1481 828 1.78 1662 874 1.98 1844 3900 683 1.28 1197 739 1.48 1385 792 1.69 1572 840 1.88 1758 886 2.08 1943 4000 697 1.37 1281 753 1.58 1474 804 1.79 1666 852 1.99 1857 897 2.20 2048 4100 712 1.47 1370 766 1.68 1567 817 1.89 1764 864 2.10 1960 909 2.31 2155 4200 726 1.57 1462 780 1.79 1665 830 2.00 1866 876 2.22 2067 920 2.43 2268 4300 741 1.67 1559 794 1.89 1767 843 2.12 1973 889 2.34 2179 932 2.56 2384 4400 755 1.78 1660 807 2.01 1873 856 2.23 2084 901 2.46 2295 944 2.69 2505 4500 770 1.89 1766 821 2.13 1984 869 2.36 2200 914 2.59 2415 956 2.82 2630 4600 785 2.01 1876 835 2.25 2099 882 2.49 2320 926 2.72 2541 968 2.96 2760 4700 800 2.14 1991 849 2.38 2219 895 2.62 2445 939 2.86 2670 980 3.10 2895 4800 815 2.26 2111 863 2.51 2344 909 2.76 2575 952 3.01 2805 993 3.25 3034 4900 829 2.40 2235 877 2.65 2473 922 2.91 2709 965 3.16 2944 1005 3.41 3178 5000 844 2.54 2365 891 2.80 2608 936 3.06 2849 978 3.31 3089 1018 3.57 3328 5100 859 2.68 2499 906 2.95 2747 949 3.21 2994 991 3.47 3238 1030 3.73 3483 5200 874 2.83 2640 920 3.10 2892 963 3.37 3143 1004 3.64 3393 1043 3.91 3642 5300 889 2.99 2784 934 3.26 3042 977 3.54 3298 1017 3.81 3553 1056 4.08 3807 5400 904 3.15 2936 949 3.43 3198 990 3.71 3459 1030 3.99 3719 1068 4.27 3977 5500 920 3.32 3092 963 3.60 3359 1004 3.89 3625 1044 4.17 3890 1081 4.45 4153 5600 935 3.49 3253 977 3.78 3525 1018 4.07 3796 1057 4.36 4066 1094 4.65 4335 5700 950 3.67 3421 992 3.97 3698 1032 4.26 3974 1070 4.56 4249 1107 4.85 4522 5800 965 3.85 3594 1006 4.16 3876 1046 4.46 4157 1084 4.76 4436 1120 5.06 4715 5900 980 4.05 3773 1021 4.35 4060 1060 4.66 4346 1098 4.97 4630 — — — 6000 995 4.24 3958 1036 4.56 4250 1074 4.87 4541 1111 5.18 4831 — — — 6100 1011 4.45 4149 1050 4.77 4446 1088 5.09 4742 — ————— 6200 1026 4.66 4347 1065 4.99 4649 ————————— 6300 1041 4.88 4550 ————————————

AIRFLOW

CFM

3700 907 2.06 1924 949 2.25 2101 989 2.44 2279 1027 2.63 2457 1063 2.83 2636 3800 918 2.17 2025 959 2.37 2207 999 2.56 2389 1036 2.76 2571 1073 2.95 2755 3900 929 2.28 2130 970 2.48 2316 1009 2.68 2502 1046 2.88 2690 1082 3.09 2877 4000 940 2.40 2238 980 2.61 2429 1019 2.81 2620 1056 3.02 2812 1092 3.22 3004 4100 951 2.52 2351 991 2.73 2547 1029 2.94 2743 1066 3.15 2939 1102 3.36 3136 4200 962 2.65 2468 1002 2.86 2668 1040 3.08 2869 1076 3.29 3070 1112 3.51 3271 4300 973 2.78 2589 1013 3.00 2794 1050 3.22 2999 1087 3.44 3205 1122 3.66 3411 4400 985 2.91 2715 1024 3.14 2924 1061 3.36 3134 1097 3.59 3345 1132 3.81 3555 4500 996 3.05 2845 1035 3.28 3059 1072 3.51 3274 1108 3.74 3489 1142 3.97 3704 4600 1008 3.20 2979 1046 3.43 3199 1083 3.67 3418 1118 3.90 3638 1152 4.14 3857 4700 1020 3.34 3119 1058 3.58 3343 1094 3.83 3567 1129 4.07 3792 1163 4.31 4016 4800 1032 3.50 3263 1069 3.74 3492 1105 3.99 3721 1140 4.24 3950 1174 4.48 4179 4900 1044 3.66 3413 1081 3.91 3646 1117 4.16 3880 1151 4.41 4113 1184 4.66 4347 5000 1056 3.82 3566 1093 4.08 3805 1128 4.34 4044 1162 4.59 4282 1195 4.85 4520 5100 1068 4.00 3726 1104 4.26 3969 1139 4.52 4212 1173 4.78 4456 1206 5.04 4699 5200 1080 4.17 3891 1116 4.44 4139 1151 4.70 4386 1185 4.97 4634 ——— 5300 1093 4.35 4060 1128 4.63 4314 1163 4.90 4566 1196 5.17 4819 ——— 5400 1105 4.54 4236 1140 4.82 4494 1174 5.10 4751 —————— 5500 1118 4.74 4417 1152 5.02 4679 ————————— 5600 1130 4.94 4603 ———————————— 5700 ——————————————— 5800 ——————————————— 5900 ——————————————— 6000 ——————————————— 6100 ——————————————— 6200 ——————————————— 6300 ———————————————

Bhp — Brake Horsepower Input to Fan Watts — Input Watts to Motor

*Motor drive range: 830 to 1130 rpm. All other rpms require field-

supplied drive.

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

LEGEND

0.2 0.4 0.6 0.8 1.0

1.2 1.4 1.6 1.8 2.0

EXTERNAL STATIC PRESSURE (in. wg)

NOTES:

1. Boldface indicates field-supplied drive is required.

2. Maximum continuous bhp is 5.25.

3. See page 23 for general fan performance notes.

—30—

Page 31

Table 22 — Fan Performance 551B090 — Horizontal Discharge Units; Standard Motor (Belt Drive)*

AIRFLOW

CFM

2250 465 0.43 402 555 0.64 596 629 0.86 802 694 1.10 1021 753 1.34 1252 2300 471 0.45 421 560 0.66 618 634 0.89 828 699 1.13 1050 757 1.38 1283 2400 483 0.49 461 571 0.71 665 644 0.94 881 708 1.19 1109 766 1.45 1348 2500 495 0.54 503 581 0.77 715 654 1.01 937 717 1.26 1171 775 1.52 1416 2550 501 0.56 526 587 0.79 740 659 1.04 967 722 1.29 1204 779 1.56 1452 2600 507 0.59 549 592 0.82 767 664 1.07 996 727 1.33 1237 784 1.60 1488 2700 519 0.64 597 603 0.88 823 674 1.14 1059 737 1.40 1306 793 1.68 1563 2800 532 0.70 649 614 0.95 882 684 1.21 1125 746 1.48 1378 803 1.76 1641 2900 544 0.75 703 625 1.01 944 695 1.28 1194 756 1.56 1453 812 1.85 1723 3000 557 0.82 761 637 1.08 1009 705 1.36 1266 766 1.64 1533 822 1.94 1808 3100 570 0.88 823 648 1.16 1079 716 1.44 1342 776 1.73 1615 831 2.03 1897 3200 583 0.95 888 660 1.23 1151 727 1.53 1422 787 1.82 1702 841 2.13 1991 3300 596 1.03 957 672 1.32 1228 738 1.61 1506 797 1.92 1792 851 2.24 2088 3400 609 1.10 1030 684 1.40 1308 749 1.71 1593 808 2.02 1887 861 2.35 2188 3500 622 1.19 1106 696 1.49 1392 760 1.81 1685 818 2.13 1985 872 2.46 2294 3600 635 1.27 1187 708 1.59 1481 771 1.91 1781 829 2.24 2088 882 2.58 2403 3700 649 1.36 1272 720 1.69 1573 783 2.02 1881 840 2.35 2195 892 2.70 2517 3750 655 1.41 1316 726 1.74 1621 789 2.07 1932 845 2.41 2250 897 2.76 2575

AIRFLOW

CFM

2250 806 1.60 1494 856 1.87 1747 903 2.15 2009 947 2.45 2282 988 2.75 2564 2300 811 1.64 1528 860 1.91 1784 907 2.20 2048 950 2.49 2323 992 2.80 2607 2400 819 1.71 1599 868 1.99 1859 915 2.28 2129 958 2.58 2410 1000 2.89 2698 2500 828 1.79 1672 877 2.08 1938 923 2.37 2214 966 2.68 2499 — — — 2550 832 1.83 1710 881 2.12 1979 927 2.42 2258 971 2.73 2545 — — — 2600 836 1.88 1749 885 2.17 2021 931 2.47 2302 975 2.78 2592 — — — 2700 845 1.96 1830 894 2.26 2107 940 2.57 2394 983 2.88 2689 — — — 2800 854 2.05 1914 903 2.36 2197 948 2.67 2488 — ————— 2900 864 2.15 2002 912 2.46 2290 957 2.77 2587 — ————— 3000 873 2.24 2093 921 2.56 2388 966 2.89 2691 — ————— 3100 882 2.35 2189 930 2.67 2489 ————————— 3200 892 2.45 2288 939 2.78 2595 ————————— 3300 901 2.56 2391 948 2.90 2704 ————————— 3400 911 2.68 2499 ———————————— 3500 921 2.80 2610 ———————————— 3600 ——————————————— 3700 ——————————————— 3750 ———————————————

Bhp — Brake Horsepower Input to Fan Watts — Input Watts to Motor

*Motor drive range: 840 to 1085 rpm. All other rpms require field-

supplied drive.

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

LEGEND

0.2 0.4 0.6 0.8 1.0

1.2 1.4 1.6 1.8 2.0

EXTERNAL STATIC PRESSURE (in. wg)

NOTES:

1. Boldface indicates field-supplied drive is required.

2. Maximum continuous bhp is 2.90.

3. See page 23 for general fan performance notes.

—31—

Page 32

Table 23 — Fan Performance 551B090 — Horizontal Discharge Units; High-Static Motor (Belt Drive)*

AIRFLOW

CFM

AIRFLOW

CFM

2250 806 1.60 1494 856 1.87 1747 903 2.15 2009 947 2.45 2282 988 2.75 2564 2300 811 1.64 1528 860 1.91 1784 907 2.20 2048 950 2.49 2323 992 2.80 2607 2400 819 1.71 1599 868 1.99 1859 915 2.28 2129 958 2.58 2410 1000 2.89 2698 2500 828 1.79 1672 877 2.08 1938 923 2.37 2214 966 2.68 2499 1008 3.00 2793 2550 832 1.83 1710 881 2.12 1979 927 2.42 2258 971 2.73 2545 1012 3.05 2842 2600 836 1.88 1749 885 2.17 2021 931 2.47 2302 975 2.78 2592 1016 3.10 2891 2700 845 1.96 1830 894 2.26 2107 940 2.57 2394 983 2.88 2689 1024 3.21 2993 2800 854 2.05 1914 903 2.36 2197 948 2.67 2488 991 2.99 2790 1032 3.32 3099 2900 864 2.15 2002 912 2.46 2290 957 2.77 2587 1000 3.10 2894 1041 3.44 3209 3000 873 2.24 2093 921 2.56 2388 966 2.89 2691 1008 3.22 3003 1049 3.56 3323 3100 882 2.35 2189 930 2.67 2489 975 3.00 2798 1017 3.34 3115 1057 3.69 3441 3200 892 2.45 2288 939 2.78 2595 984 3.12 2909 1026 3.47 3233 1066 3.82 3564 3300 901 2.56 2391 948 2.90 2704 993 3.24 3024 1035 3.60 3353 1075 3.96 3690 3400 911 2.68 2499 958 3.02 2817 1002 3.37 3144 1044 3.73 3479 1084 4.10 3821 3500 921 2.80 2610 967 3.15 2935 1011 3.50 3268 1053 3.87 3608 — — — 3600 931 2.92 2726 977 3.28 3057 1021 3.64 3396 1062 4.01 3743 — — — 3700 941 3.05 2847 987 3.41 3184 1030 3.78 3529 1071 4.16 3882 — — — 3750 946 3.12 2908 992 3.48 3249 1035 3.86 3597 — —————

Bhp — Brake Horsepower Input to Fan Watts — Input Watts to Motor

*Motor drive range: 860 to 1080 rpm. All other rpms require field-

supplied drive.

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

LEGEND

0.2 0.4 0.6 0.8 1.0

1.2 1.4 1.6 1.8 2.0

EXTERNAL STATIC PRESSURE (in. wg)

NOTES:

1. Boldface indicates field-supplied drive is required.

2. Maximum continuous bhp is 4.20.

3. See page 23 for general fan performance notes.

—32—

Page 33

Table 24 — Fan Performance 551B102 — Horizontal Discharge Units; Standard Motor (Belt Drive)*

AIRFLOW

CFM

2500 462 0.37 348 541 0.50 467 614 0.64 594 681 0.78 728 744 0.93 868 2600 474 0.41 381 551 0.54 505 622 0.68 635 688 0.83 773 750 0.98 916 2700 486 0.45 417 561 0.58 545 630 0.73 679 695 0.88 820 756 1.04 967 2800 498 0.49 456 571 0.63 587 639 0.78 725 702 0.93 870 762 1.09 1020 2900 510 0.53 497 581 0.68 632 648 0.83 774 710 0.99 922 768 1.15 1076 3000 523 0.58 541 592 0.73 680 657 0.88 825 718 1.05 977 775 1.22 1135 3100 536 0.63 587 603 0.78 730 666 0.94 879 726 1.11 1035 783 1.28 1196 3200 549 0.68 637 614 0.84 783 676 1.00 936 735 1.17 1096 790 1.35 1260 3300 562 0.74 689 626 0.90 839 686 1.07 996 743 1.24 1159 798 1.42 1328 3400 575 0.80 744 637 0.96 898 696 1.14 1059 752 1.31 1226 806 1.50 1398 3500 588 0.86 802 649 1.03 961 707 1.21 1125 762 1.39 1296 815 1.58 1472 3600 601 0.93 864 661 1.10 1026 717 1.28 1194 771 1.47 1369 823 1.66 1548 3700 614 1.00 929 673 1.17 1095 728 1.36 1267 781 1.55 1445 832 1.75 1629 3800 628 1.07 997 685 1.25 1167 739 1.44 1343 791 1.64 1525 841 1.84 1712 3900 641 1.15 1069 697 1.33 1243 750 1.53 1423 801 1.72 1608 850 1.93 1799 4000 655 1.23 1144 709 1.42 1322 761 1.61 1506 812 1.82 1695 860 2.03 1890 4100 668 1.31 1223 722 1.51 1405 773 1.71 1593 822 1.92 1786 870 2.13 1984 4200 682 1.40 1305 734 1.60 1492 784 1.80 1683 833 2.02 1880 880 2.23 2082 4300 696 1.49 1392 747 1.70 1582 796 1.91 1777 844 2.12 1979 890 2.34 2184

AIRFLOW

CFM

2500 804 1.09 1013 861 1.25 1164 915 1.41 1319 967 1.59 1479 1017 1.76 1642 2600 809 1.14 1065 864 1.31 1219 918 1.48 1378 969 1.65 1541 1018 1.83 1708 2700 813 1.20 1119 869 1.37 1277 921 1.54 1439 972 1.72 1606 1021 1.90 1776 2800 819 1.26 1176 873 1.43 1337 925 1.61 1503 975 1.79 1673 1023 1.98 1847 2900 824 1.32 1235 878 1.50 1400 929 1.68 1569 978 1.87 1742 1026 2.06 1920 3000 830 1.39 1298 883 1.57 1466 934 1.76 1638 982 1.95 1815 1029 2.14 1996 3100 837 1.46 1363 889 1.65 1534 938 1.83 1710 986 2.03 1891 1033 2.23 2075 3200 843 1.53 1431 894 1.72 1606 944 1.91 1785 991 2.11 1969 1037 2.31 2157 3300 850 1.61 1502 901 1.80 1680 949 2.00 1863 996 2.20 2051 1041 2.40 2242 3400 858 1.69 1576 907 1.88 1758 955 2.09 1944 1001 2.29 2135 1046 2.50 2331 3500 865 1.77 1653 914 1.97 1838 961 2.18 2029 1007 2.38 2223 1051 2.60 2422 3600 873 1.86 1733 921 2.06 1922 967 2.27 2116 1012 2.48 2314 1056 2.70 2516 3700 881 1.95 1816 928 2.16 2010 974 2.37 2207 1019 2.58 2409 1062 2.80 2615 3800 889 2.04 1904 936 2.25 2100 981 2.47 2302 1025 2.69 2507 — — — 3900 898 2.14 1995 944 2.35 2195 988 2.57 2399 1032 2.80 2608 — — — 4000 907 2.24 2089 952 2.46 2293 996 2.68 2501 — ————— 4100 916 2.35 2187 960 2.57 2395 1004 2.80 2607 — ————— 4200 925 2.45 2289 969 2.68 2500 ————————— 4300 934 2.57 2395 978 2.80 2610 —————————

Bhp — Brake Horsepower Input to Fan Watts — Input Watts to Motor

*Motor drive range: 840 to 1085 rpm. All other rpms require field-

supplied drive.

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

LEGEND

0.2 0.4 0.6 0.8 1.0

1.2 1.4 1.6 1.8 2.0

EXTERNAL STATIC PRESSURE (in. wg)

NOTES:

1. Boldface indicates field-supplied drive is required.

2. Maximum continuous bhp is 2.90.

3. See page 23 for general fan performance notes.

—33—

Page 34

Table 25 — Fan Performance 551B102 — Horizontal Discharge Units; High-Static Motor (Belt Drive)*

AIRFLOW

CFM

AIRFLOW

CFM

2500 804 1.09 1013 861 1.25 1164 915 1.41 1319 967 1.59 1479 1017 1.76 1642 2600 809 1.14 1065 864 1.31 1219 918 1.48 1378 969 1.65 1541 1018 1.83 1708 2700 813 1.20 1119 869 1.37 1277 921 1.54 1439 972 1.72 1606 1021 1.90 1776 2800 819 1.26 1176 873 1.43 1337 925 1.61 1503 975 1.79 1673 1023 1.98 1847 2900 824 1.32 1235 878 1.50 1400 929 1.68 1569 978 1.87 1742 1026 2.06 1920 3000 830 1.39 1298 883 1.57 1466 934 1.76 1638 982 1.95 1815 1029 2.14 1996 3100 837 1.46 1363 889 1.65 1534 938 1.83 1710 986 2.03 1891 1033 2.23 2075 3200 843 1.53 1431 894 1.72 1606 944 1.91 1785 991 2.11 1969 1037 2.31 2157 3300 850 1.61 1502 901 1.80 1680 949 2.00 1863 996 2.20 2051 1041 2.40 2242 3400 858 1.69 1576 907 1.88 1758 955 2.09 1944 1001 2.29 2135 1046 2.50 2331 3500 865 1.77 1653 914 1.97 1838 961 2.18 2029 1007 2.38 2223 1051 2.60 2422 3600 873 1.86 1733 921 2.06 1922 967 2.27 2116 1012 2.48 2314 1056 2.70 2516 3700 881 1.95 1816 928 2.16 2010 974 2.37 2207 1019 2.58 2409 1062 2.80 2615 3800 889 2.04 1904 936 2.25 2100 981 2.47 2302 1025 2.69 2507 1068 2.91 2716 3900 898 2.14 1995 944 2.35 2195 988 2.57 2399 1032 2.80 2608 1074 3.03 2821 4000 907 2.24 2089 952 2.46 2293 996 2.68 2501 1038 2.91 2713 1080 3.14 2930 4100 916 2.35 2187 960 2.57 2395 1004 2.80 2607 1046 3.03 2822 1087 3.26 3042 4200 925 2.45 2289 969 2.68 2500 1011 2.91 2716 1053 3.15 2935 1094 3.39 3159 4300 934 2.57 2395 978 2.80 2610 1020 3.03 2828 1061 3.27 3052 1101 3.52 3279

Bhp — Brake Horsepower Input to Fan Watts — Input Watts to Motor

*Motor drive range: 860 to 1080 rpm. All other rpms require field-

supplied drive.

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

LEGEND

0.2 0.4 0.6 0.8 1.0

1.2 1.4 1.6 1.8 2.0

EXTERNAL STATIC PRESSURE (in. wg)

NOTES:

1. Boldface indicates field-supplied drive is required.

2. Maximum continuous bhp is 4.20.

3. See page 23 for general fan performance notes.

—34—

Page 35

Table 26 — Fan Performance 551B120 — Horizontal Discharge Units; Standard Motor (Belt Drive)*

AIRFLOW

CFM

3000 523 0.58 541 592 0.73 680 657 0.88 825 718 1.05 977 775 1.22 1135 3100 536 0.63 587 603 0.78 730 666 0.94 879 726 1.11 1035 783 1.28 1196 3200 549 0.68 637 614 0.84 783 676 1.00 936 735 1.17 1096 790 1.35 1260 3300 562 0.74 689 626 0.90 839 686 1.07 996 743 1.24 1159 798 1.42 1328 3400 575 0.80 744 637 0.96 898 696 1.14 1059 752 1.31 1226 806 1.50 1398 3500 588 0.86 802 649 1.03 961 707 1.21 1125 762 1.39 1296 815 1.58 1472 3600 601 0.93 864 661 1.10 1026 717 1.28 1194 771 1.47 1369 823 1.66 1548 3700 614 1.00 929 673 1.17 1095 728 1.36 1267 781 1.55 1445 832 1.75 1629 3800 628 1.07 997 685 1.25 1167 739 1.44 1343 791 1.64 1525 841 1.84 1712 3900 641 1.15 1069 697 1.33 1243 750 1.53 1423 801 1.72 1608 850 1.93 1799 4000 655 1.23 1144 709 1.42 1322 761 1.61 1506 812 1.82 1695 860 2.03 1890 4100 668 1.31 1223 722 1.51 1405 773 1.71 1593 822 1.92 1786 870 2.13 1984 4200 682 1.40 1305 734 1.60 1492 784 1.80 1683 833 2.02 1880 880 2.23 2082 4300 696 1.49 1392 747 1.70 1582 796 1.91 1777 844 2.12 1979 890 2.34 2184 4400 710 1.59 1482 760 1.80 1677 808 2.01 1876 855 2.23 2081 900 2.46 2290 4500 723 1.69 1577 773 1.90 1775 820 2.12 1978 866 2.35 2187 910 2.57 2400 4600 737 1.80 1675 785 2.01 1877 832 2.24 2085 877 2.46 2297 921 2.70 2514 4700 751 1.91 1778 798 2.13 1984 844 2.35 2195 889 2.59 2412 932 2.82 2633 4800 765 2.02 1885 812 2.25 2095 856 2.48 2310 900 2.71 2531 942 2.95 2756 4900 779 2.14 1996 825 2.37 2210 869 2.61 2430 912 2.85 2654 953 3.09 2883 5000 793 2.26 2112 838 2.50 2330 881 2.74 2554 923 2.98 2782 965 3.23 3014

AIRFLOW

CFM

3000 830 1.39 1298 883 1.57 1466 934 1.76 1638 982 1.95 1815 1029 2.14 1996 3100 837 1.46 1363 889 1.65 1534 938 1.83 1710 986 2.03 1891 1033 2.23 2075 3200 843 1.53 1431 894 1.72 1606 944 1.91 1785 991 2.11 1969 1037 2.31 2157 3300 850 1.61 1502 901 1.80 1680 949 2.00 1863 996 2.20 2051 1041 2.40 2242 3400 858 1.69 1576 907 1.88 1758 955 2.09 1944 1001 2.29 2135 1046 2.50 2331 3500 865 1.77 1653 914 1.97 1838 961 2.18 2029 1007 2.38 2223 1051 2.60 2422 3600 873 1.86 1733 921 2.06 1922 967 2.27 2116 1012 2.48 2314 1056 2.70 2516 3700 881 1.95 1816 928 2.16 2010 974 2.37 2207 1019 2.58 2409 1062 2.80 2615 3800 889 2.04 1904 936 2.25 2100 981 2.47 2302 1025 2.69 2507 1068 2.91 2716 3900 898 2.14 1995 944 2.35 2195 988 2.57 2399 1032 2.80 2608 1074 3.03 2821 4000 907 2.24 2089 952 2.46 2293 996 2.68 2501 1038 2.91 2713 1080 3.14 2930 4100 916 2.35 2187 960 2.57 2395 1004 2.80 2607 1046 3.03 2822 1087 3.26 3042 4200 925 2.45 2289 969 2.68 2500 1011 2.91 2716 1053 3.15 2935 1094 3.39 3159 4300 934 2.57 2395 978 2.80 2610 1020 3.03 2828 1061 3.27 3052 1101 3.52 3279 4400 944 2.69 2504 986 2.92 2723 1028 3.16 2946 1068 3.40 3173 1108 3.65 3403 4500 954 2.81 2618 996 3.05 2840 1037 3.29 3067 1076 3.54 3297 — — — 4600 963 2.93 2736 1005 3.18 2962 1045 3.42 3192 1085 3.67 3426 ——— 4700 974 3.07 2858 1014 3.31 3088 1054 3.56 3322 — ————— 4800 984 3.20 2985 1024 3.45 3219 ————————— 4900 994 3.34 3116 1034 3.60 3353 ————————— 5000 1005 3.49 3251 ————————————

Bhp — Brake Horsepower Input to Fan Watts — Input Watts to Motor

*Motor drive range: 860 to 1080 rpm. All other rpms require field-

supplied drive.

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

LEGEND

0.2 0.4 0.6 0.8 1.0

1.2 1.4 1.6 1.8 2.0

EXTERNAL STATIC PRESSURE (in. wg)

NOTES:

1. Boldface indicates field-supplied drive is required.

2. Maximum continuous bhp is 3.70.

3. See page 23 for general fan performance notes.

—35—

Page 36

Table 27 — Fan Performance 551B120 — Horizontal Discharge Units; High-Static Motor (Belt Drive)*

AIRFLOW

CFM

AIRFLOW

CFM

3000 830 1.39 1298 883 1.57 1466 934 1.76 1638 982 1.95 1815 1029 2.14 1996 3100 837 1.46 1363 889 1.65 1534 938 1.83 1710 986 2.03 1891 1033 2.23 2075 3200 843 1.53 1431 894 1.72 1606 944 1.91 1785 991 2.11 1969 1037 2.31 2157 3300 850 1.61 1502 901 1.80 1680 949 2.00 1863 996 2.20 2051 1041 2.40 2242 3400 858 1.69 1576 907 1.88 1758 955 2.09 1944 1001 2.29 2135 1046 2.50 2331 3500 865 1.77 1653 914 1.97 1838 961 2.18 2029 1007 2.38 2223 1051 2.60 2422 3600 873 1.86 1733 921 2.06 1922 967 2.27 2116 1012 2.48 2314 1056 2.70 2516 3700 881 1.95 1816 928 2.16 2010 974 2.37 2207 1019 2.58 2409 1062 2.80 2615 3800 889 2.04 1904 936 2.25 2100 981 2.47 2302 1025 2.69 2507 1068 2.91 2716 3900 898 2.14 1995 944 2.35 2195 988 2.57 2399 1032 2.80 2608 1074 3.03 2821 4000 907 2.24 2089 952 2.46 2293 996 2.68 2501 1038 2.91 2713 1080 3.14 2930 4100 916 2.35 2187 960 2.57 2395 1004 2.80 2607 1046 3.03 2822 1087 3.26 3042 4200 925 2.45 2289 969 2.68 2500 1011 2.91 2716 1053 3.15 2935 1094 3.39 3159 4300 934 2.57 2395 978 2.80 2610 1020 3.03 2828 1061 3.27 3052 1101 3.52 3279 4400 944 2.69 2504 986 2.92 2723 1028 3.16 2946 1068 3.40 3173 1108 3.65 3403 4500 954 2.81 2618 996 3.05 2840 1037 3.29 3067 1076 3.54 3297 1115 3.79 3531 4600 963 2.93 2736 1005 3.18 2962 1045 3.42 3192 1085 3.67 3426 1123 3.93 3664 4700 974 3.07 2858 1014 3.31 3088 1054 3.56 3322 1093 3.82 3560 1131 4.08 3801 4800 984 3.20 2985 1024 3.45 3219 1063 3.71 3456 1102 3.96 3697 1139 4.23 3943 4900 994 3.34 3116 1034 3.60 3353 1073 3.85 3594 1111 4.12 3839 1148 4.38 4088 5000 1005 3.49 3251 1044 3.74 3492 1082 4.01 3737 1119 4.27 3986 1156 4.55 4238

Bhp — Brake Horsepower Input to Fan Watts — Input Watts to Motor

*Motor drive range: 830 to 1130 rpm. All other rpms require field-

supplied drive.

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

LEGEND

0.2 0.4 0.6 0.8 1.0

1.2 1.4 1.6 1.8 2.0

EXTERNAL STATIC PRESSURE (in. wg)

NOTES:

1. Boldface indicates field-supplied drive is required.

2. Maximum continuous bhp is 5.25.

3. See page 23 for general fan performance notes.

—36—

Page 37

Table 28 — Fan Performance 551B150 — Horizontal Discharge Units; Standard Motor (Belt Drive)*

AIRFLOW

CFM

3700 614 1.00 929 673 1.17 1095 728 1.36 1267 781 1.55 1445 832 1.75 1629 3800 628 1.07 997 685 1.25 1167 739 1.44 1343 791 1.64 1525 841 1.84 1712 3900 641 1.15 1069 697 1.33 1243 750 1.53 1423 801 1.72 1608 850 1.93 1799 4000 655 1.23 1144 709 1.42 1322 761 1.61 1506 812 1.82 1695 860 2.03 1890 4100 668 1.31 1223 722 1.51 1405 773 1.71 1593 822 1.92 1786 870 2.13 1984 4200 682 1.40 1305 734 1.60 1492 784 1.80 1683 833 2.02 1880 880 2.23 2082 4300 696 1.49 1392 747 1.70 1582 796 1.91 1777 844 2.12 1979 890 2.34 2184 4400 710 1.59 1482 760 1.80 1677 808 2.01 1876 855 2.23 2081 900 2.46 2290 4500 723 1.69 1577 773 1.90 1775 820 2.12 1978 866 2.35 2187 910 2.57 2400 4600 737 1.80 1675 785 2.01 1877 832 2.24 2085 877 2.46 2297 921 2.70 2514 4700 751 1.91 1778 798 2.13 1984 844 2.35 2195 889 2.59 2412 932 2.82 2633 4800 765 2.02 1885 812 2.25 2095 856 2.48 2310 900 2.71 2531 942 2.95 2756 4900 779 2.14 1996 825 2.37 2210 869 2.61 2430 912 2.85 2654 953 3.09 2883 5000 793 2.26 2112 838 2.50 2330 881 2.74 2554 923 2.98 2782 965 3.23 3014 5100 807 2.39 2232 851 2.63 2455 894 2.88 2682 935 3.13 2914 976 3.38 3150 5200 821 2.53 2357 864 2.77 2584 906 3.02 2815 947 3.27 3050 987 3.53 3292 5300 835 2.67 2487 878 2.91 2718 919 3.17 2953 959 3.42 3193 999 3.69 3437 5400 850 2.81 2622 891 3.06 2856 932 3.32 3096 971 3.58 3339 1010 3.85 3588 5500 864 2.96 2762 905 3.22 3000 945 3.48 3242 984 3.74 3491 1022 4.01 3743 5600 878 3.12 2906 918 3.38 3148 958 3.64 3396 996 3.91 3648 1034 4.19 3903 5700 892 3.28 3055 932 3.54 3302 971 3.81 3554 1008 4.09 3810 1045 4.36 4069 5800 907 3.44 3211 945 3.71 3461 984 3.99 3716 1021 4.26 3976 1057 4.55 4240 5900 921 3.61 3370 959 3.89 3626 997 4.17 3885 1033 4.45 4149 1069 4.74 4416 6000 935 3.79 3536 973 4.07 3795 1010 4.35 4059 1046 4.64 4326 1082 4.93 4598 6100 949 3.98 3707 987 4.26 3970 1023 4.54 4238 1059 4.84 4510 1094 5.13 4785 6200 964 4.16 3883 1000 4.45 4151 1036 4.74 4422 1071 5.04 4698 — — — 6300 978 4.36 4066 1014 4.65 4337 1050 4.95 4613 1084 5.25 4892 — — —

AIRFLOW

CFM

3700 881 1.95 1816 928 2.16 2010 974 2.37 2207 1019 2.58 2409 1062 2.80 2615 3800 889 2.04 1904 936 2.25 2100 981 2.47 2302 1025 2.69 2507 1068 2.91 2716 3900 898 2.14 1995 944 2.35 2195 988 2.57 2399 1032 2.80 2608 1074 3.03 2821 4000 907 2.24 2089 952 2.46 2293 996 2.68 2501 1038 2.91 2713 1080 3.14 2930 4100 916 2.35 2187 960 2.57 2395 1004 2.80 2607 1046 3.03 2822 1087 3.26 3042 4200 925 2.45 2289 969 2.68 2500 1011 2.91 2716 1053 3.15 2935 1094 3.39 3159 4300 934 2.57 2395 978 2.80 2610 1020 3.03 2828 1061 3.27 3052 1101 3.52 3279 4400 944 2.69 2504 986 2.92 2723 1028 3.16 2946 1068 3.40 3173 1108 3.65 3403 4500 954 2.81 2618 996 3.05 2840 1037 3.29 3067 1076 3.54 3297 1115 3.79 3531 4600 963 2.93 2736 1005 3.18 2962 1045 3.42 3192 1085 3.67 3426 1123 3.93 3664 4700 974 3.07 2858 1014 3.31 3088 1054 3.56 3322 1093 3.82 3560 1131 4.08 3801 4800 984 3.20 2985 1024 3.45 3219 1063 3.71 3456 1102 3.96 3697 1139 4.23 3943 4900 994 3.34 3116 1034 3.60 3353 1073 3.85 3594 1111 4.12 3839 1148 4.38 4088 5000 1005 3.49 3251 1044 3.74 3492 1082 4.01 3737 1119 4.27 3986 1156 4.55 4238 5100 1015 3.64 3391 1054 3.90 3636 1092 4.17 3885 1129 4.44 4137 1165 4.71 4393 5200 1026 3.79 3536 1064 4.06 3784 1101 4.33 4037 1138 4.60 4293 1174 4.88 4553 5300 1037 3.95 3685 1075 4.22 3938 1111 4.50 4194 1147 4.78 4454 1183 5.06 4718 5400 1048 4.12 3840 1085 4.39 4096 1121 4.67 4356 1157 4.95 4619 1192 5.24 4886 5500 1059 4.29 3999 1096 4.57 4259 1132 4.85 4523 1167 5.14 4790 ——— 5600 1070 4.46 4163 1106 4.75 4427 1142 5.03 4695 —————— 5700 1082 4.65 4333 1117 4.93 4601 1152 5.22 4872 —————— 5800 1093 4.83 4508 1128 5.13 4779 ————————— 5900 1105 5.03 4688 ———————————— 6000 1116 5.23 4873 ———————————— 6100 ——————————————— 6200 ——————————————— 6300 ———————————————

Bhp — Brake Horsepower Input to Fan Watts — Input Watts to Motor

*Motor drive range: 830 to 1130 rpm. All other rpms require field-

supplied drive.

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

LEGEND

0.2 0.4 0.6 0.8 1.0

1.2 1.4 1.6 1.8 2.0

EXTERNAL STATIC PRESSURE (in. wg)

NOTES:

1. Boldface indicates field-supplied drive is required.

2. Maximum continuous bhp is 5.25.

3. See page 23 for general fan performance notes.

—37—

Page 38

PRE-START-UP

WARNING: Failure to observe the f ollowing warn-

ings could result in serious personal injury:

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 comp ressor terminal cov er until all electri ca l so ur c es ar e d is c onnected and properly tagged.

4. Relieve all pressure from system before touching or disturbing anything inside terminal box if refrigerant leak is su spe cte d arou nd c ompre ssor terminals. Use accepted meth ods to reco ver refrigerant.

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 all pressure from system using

both high and low-pressure ports. Use accepted methods to recover refrigerant.

c. Cut component connection tubing with tub-

ing cutter and remove component from unit.

d. Carefully unsweat remaining tubing stubs

when necessary. Oil can ignite when exposed to torch flame.

Proceed as follows to ins pect and prep are the unit f or initial start-up:

1. Remove all access panels.

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

3. Make the following inspections:

a. Inspect for shipping and handling damages such

as broken lines, loose parts, or disconnected wires.

b. Inspect for oil at all refrigerant tubing connec-

tions and on unit base. Detecting oil generally indicates a refrigerant leak. Leak-test all refrigerant tubing connections using electronic leak detector, halide torch, or liquid-soap solution.

c. Inspect all field-wiring and factory-wiring con-

nections. Be sure that connections are completed and tight.

d. Inspect coil fins. If damaged during shipping and

handling, carefully straighten fins with a fin comb.

4. Verify the following:

a. Make sure that condenser-fan blades are

correctly positioned in fan orifice. Refer to Condenser-Fan Adjustment section on page 42 for more details.

b. Make sure that air filters are in place.

c. Make sure that condensate drain trap is filled

with water to ensure proper drainage.

d. Make sure that all tools and miscellaneous loose

parts have been removed.

e. Make sure that the start-up checklist has been

performed and filled out.

NOTE: Ensure wiring does not contact any refrigerant tubing.

START-UP

I. UNIT PREPARATION

Make sure that unit has b een installed in accordance with these installation instructions and applicable codes.

II. RETURN-AIR FILTERS

Make sure correct filters are installed in unit (see Table 1). Do not operate unit without return-air filters.

III. OUTDOOR-AIR INLET SCREENS

Outdoor-air inlet screens must be in place before op erating unit.

IV. COMPRESSOR MOUNTING

Compressors are internally spring mounted. Do not loosen or remove compressor holddown bolts.

V. INTERNAL WIRING

Check all electrical conne c tion s in unit c o ntrol b oxe s; tig hte n as required.

VI. REFRIGERANT SERVICE PORTS

Each refrigerant system has 4 Schrader-type service gage ports: one on the suction line, one on the liquid line, and 2 on the compressor discharge line. Be sure that caps on the ports are tight.

VII. HIGH FLOW VALVES

Two high flow refrigerant valves are located on the compressor hot gas and suction tubes. Large black plastic caps distinguish these valves with o-rings located inside the caps. These valves can not be accessed for service in the field. Ensure the plastic caps are in place and tight or the possibility of refrigera nt leakage could occur.

VIII. COMPRESSOR ROTATION

On 3-phase units, it is important to be certain the scroll compressor is rotating in the proper direction. To determine whether or not compressor is rotating in the proper direction:

1. Connect service gages to suction and discharge pressure fittings.

2. Energize the compressor.

3. The suction pressure should drop and the discharge pressure should rise, as is normal on any start-up.

If the suction pressure does not drop and the discharge pressure does not rise to normal levels:

1. Note that the evaporator fan is probably also rotating in the wrong direction.

2. Turn off power to the unit and install lockout tag.

3. Reverse any two of the unit power leads.

4. Turn on power to the unit.

The suction and discharge pressure levels should now move to their normal start-up levels.

NOTE: When the compre ssor is rotating in the wrong direction, the unit makes an elevated level of noise and does not provide heating or cooling.

CAUTION: Compressor damage will occur if rota-

tion is not immediately corrected.

—38—

Page 39

IX. COOLING

To start unit, turn on m ain power supply. Set system selector switch at CO OL position an d fan switch a t AUTO position. Adjust thermostat to a setting below room temperature. Compressor starts on closure of contactor.

Check unit charge. Refer to Refrigerant Charge section on page 42.

Reset thermostat at a position above room temperature. Compressor will shut off.

To Shut Off Unit

Set system selector switch at OFF position. Resetting thermostat at a positio n above room temperature sh uts unit off temporarily until space temperature exceeds thermostat setting. Units are equipped with Cycle-LOC™ protection device. Unit shuts down on any safety trip and remains off; an indicator light on the th ermosta t comes on . Check reas on for safety trip.

Compressor restart is a ccomplished by manual reset a t the thermostat by turning the selector switch to OFF position and then ON position.

X. HEATING (IF ACCESSORY HEATER IS INSTALLED)

To start unit, turn on main power supply. Set thermostat at HEAT position and a setting above room

temperature, and set fan at AUTO position. First stage of thermostat energizes the first-stage electric

heater elements; second stage energizes second-stage electric heater elements. Check heating effects at air supply grille(s).

If accessory electric heaters do not energize, reset limit switch (located on evaporator-fan scroll) by pressing button located between terminals on the switch.

To Shut Off Unit

Set system selector switch at OFF position. Resetting heating selector lever below room temperature temporarily shuts unit off until space temperature falls below thermostat setting.

XI. SAFETY RELIEF

A soft solder joint in the suction line at the loss-of-charge/ low-pressure switch fitting provides pressure relief under abnormal temperature and pressure conditions.

XII. VENTILATION (CONTINUOUS FAN)

Set fan and system selector switches at ON and OFF positions, respectively. Evaporator fan operates continuous ly to provide constant air circulation.

XIII. OPERATING SEQUENCE

A. Cooling, Units Without EconoMi$er IV

When the thermostat ca lls for cooling, terminals G and Y1 are energized. The indoor (evaporator) fan contactor (IFC), outdoor (condenser) fan contactor (OFC), and compressor contactor no. 1 (C1) are energized and the evaporator-fan motor, compressor no. 1, and condenser fans start. The condenser-fan motors run continuously while unit is in cooling. If the thermostat calls for a second stage of cooling by energizing Y2, compress or contactor no. 2 (C2) is energized and compressor no. 2 starts.

B. Heating, Units Without EconoMi$er IV (If Accessory Heater is Installed)

Upon a call for heating through terminal W1, IFC and heater contactor no. 1 (HC1) are energized. On units equipped for 2 stages of heat, when additional heat is needed, HC2 is energized through W2.

C. Cooling, Units With EconoMi$er IV

When free cool ing is not available, the com pressors will be controlled b y th e zo ne th ermost at. When f re e cool ing i s a vailable, the outdoor-air damper is modulated by the EconoMi$er IV control to provide a 50 to 55 F supply-air temperature into the zone. As the supply-air temperature fluctuates above 55 or be lo w 5 0 F, the dampers will be modulated (open or close) to bring the supply-air temperature back within the set point limits.

For EconoMi$er IV operation, there must be a thermostat call for the fan (G). This will move the damper to its minimum position during the occupied mode.

Above 50 F supply-air temperature, the dampers will modulate from 100% open to the minimum open position. From 50 F to 45 F supply-air temperature, the dampers will maintain at the minimum open position. Below 45 F the dampers will be completely shut. As the supply-air temperature rises, the dampers will come back open to the minimum open position once the supply air temperature rises to 48 F.

If optional power exhaust is installed, as the outdoor-air damper opens and closes, the power exhaust fans will be energized and deenergized.

If field-installed accessory CO

sensors are connected to the

EconoMi$er IV control, a demand controlled ventilation strategy will begin to opera te. As the CO

level in the zone

increases abo ve the CO2 set point, the minimum position of the damper will be increased proportionally. As the CO

level

decreases because of the increase in fresh air, the outdoor-air damper will be proportionally closed. Damper position will follow the higher demand condition from DCV mode or free cooling mode.

Damper movement from full closed to full open (or vice versa) will take between 1

/2 and 21/2 minutes.

If free cooling can be used as determined from the appropriate changeover com mand (switch, dr y bulb, enthalpy curve, differential dry bulb, or differential enthalpy), a call for cooling (Y1 closes at the thermostat) will cause the control to modulate the dampers open to maintain the supply a ir temperature set point at 50 to 55 F.

As the supply-air temperature drops below the set point range of 50 to 55 F, the control will modulate the o utdoorair dampers closed to maintain the proper supply-air temperature.

D. Heating, Units with EconoMi$er IV

Upon a call for heating through terminal W1, IFC and heater contactor no. 1 (HC1) are energized. On units equipped for 2 stages of heat, when additional heat is needed, HC2 is energized through W2. The economizer damper moves to the minimum position. Wh en the thermostat is satisfied, the damper moves to the fully closed position.

E. Units With Perfect Humidity™ Dehumidification System

Normal Design Cooling Operation When the rooftop operates under the normal sequence of

operation, the compressors will cycle to maintain indoor conditions. See Fig. 40.

The Perfect Humidity dehumidification system includes a factory-installed Motormaster® low ambient control to keep the head and suction pressure high, allowing normal design cooling mode operat ion down to 0° F.

—39—

Page 40

Fig. 40 — Perfect Humidity™ System

Normal Design Cooling Operation

Fig. 41 — Perfect Humidity System

Subcooling Mode Operation

Subcooling Mode When subcoolin g mode is init iated, this wi ll energize (clo se)

the liquid line solenoid valve (LLSV) forcing th e hot liquid refrigerant to enter into the subcooling coil (see Fig. 41).

As the hot liquid refrigerant passes through the subcooling/ reheat dehumi difica tion co il, it is expos ed to the cold suppl y airflow coming through the evaporator coil. The liquid is further subcooled to a temperature approaching the evaporator leaving-air temperature. The liquid then enters a thermostatic expansion valve (TXV) where the liquid drops to a lower pressure. The TXV does not have a pressure drop great enough to change the liquid to a 2-phase fluid, so the liquid then enters the Acutrol™ device at the evaporator coil.

The liquid enters the evaporator coil at a temperature lower than in standard cooling operatio n. This lower temper ature increases the latent capacity of the rooftop unit. The refrigerant passes through the evaporator and is turned into a vapor. The air passing over the evaporator coil will become colder than during normal operation. However, as this same air passes over the subcooling coil, it will be slightly warmed, partially reheating the air.

Subcooling mo de op er at es on ly wh en the ou ts ide -ai r te mpe rature is warmer tha n 40 F. A f actory-installed tem perature switch located in the condenser section will lock out subcooling mode when the outside temperature is cooler than 40 F.

The scroll compressors are equipped with crankcase heaters to provide protection for the compressors due to the additional refrigerant charge required by the subcooling/reheat coil.

When in subcooling mode, there is a slight decrease in system total gross capacity (5% less), a lower gross sensible capacity (20% less), and a greatl y increased latent capacity (up to 40% more).

Hot Gas Reheat Mode When the humidity levels in the space requ ire humidity con-

trol, a hot gas solenoid valve (specific to ho t gas reheat mode only) will open to bypass a portion of hot gas refrigerant around the condenser coil (see Fig. 42).

This hot gas will mix with liquid refrigerant leaving the condenser coil and flow to the subcooling/reheat dehumidification coil. Now the co nditioned air coming off the evaporator

will be cooled and dehumidified, but will be warmed to neutral conditions (72 F to 75 F) by the subcooling/reheat dehumidification coil.

NOTE: The 551B090-150 rooftop units can operate one circuit in subcooling mode and one circuit in hot gas reheat mode or both ci rcui ts in hot ga s r eh eat mo de, or bo th in no rmal design cooling mode.

The net effect of the roof top when in ho t gas reheat mode is to provide nearly all latent c apacity removal from the space when sensible loads diminish (when outdoor temperature conditions are moderate). When in hot gas reheat mode, the unit will operate to provide mostly latent capacity and extremely low sensible heat ratio capability.

Similar to the subcooling mode of operation, hot gas reheat mode operates only when the outside air temperature is warmer than 40 F. Below this temperature , a fa ctory -inst alled outside air temperature switch will lock out this mode of operation.

See Table 29 for the Perfect Humidity dehumidification system sequence of operation.

Fig. 42 — Perfect Humidity System

Hot Gas Reheat Mode Operation

—40—

Page 41

Table 29 — Perfect Humidity™ Dehumidification System Sequence of Operation

and System Response — Dual Compressor Units

THERMOSTAT

INPUT

HY1Y2

Off — — Unit Operates Under Normal Sequence of Operation On On On No Off On Yes No On Yes No On On Off No Off On Yes No On No Yes On On On Yes On On Yes No On No Yes On On Off Yes On On No Yes On No Yes On Off Off No Off On No Yes On No Yes

LEGEND

OAT — Outdoor Air Temperature

NOTE: On a thermostat call for W1, all cooling and dehumidification will be off.

F. Units With Power Exhaust

ECONOMIZER FUNCTION

OAT < Economizer

Set Point

Economizer

First Stage Second Stage

Compressor1Subcooling

Mode

3. Remove condenser coil corner post. See Fig. 43. To

When the outdoor-air damper is modulated open, the two end switches located in the actuator are tripped. The factory settings are: switch no. 1 will close at 30% outdoor air;

4. Remove device holding coil sections together at

switch no. 2 will close at 70% outdoor-air. Both switches are field adjustable. As the outdoor-air damper opens, switch no. 1 closes, energizing a dou ble-pol e relay that sta rts fan no. 1. As the outdoor-air damper continues to open, switch no. 2

5. Use a water hose or other suitable equipment to flush

will close, energiz ing a double-pol e relay that starts fan no.

2. When the outdoor-air damper closes to a point below the fan start points (30% fan no. 1, 70% fan no. 2), the respective fan will be deenergized.

6. Secure the sectio ns together. Reposition the coil sec-

551B UNIT OPERATION

Hot Gas

Reheat Mode

Compressor 2Subcooling

Mode

Reheat Mode

hold top panel open, place coil corner post between top panel and center post. See Fig. 44.

return end of condenser coil. Carefu lly separate the outer coil section 3 to 4 in. from the inner coil section. See Fig. 45.

down between the 2 coil s ections to remove dirt and debris. Clean the outer surfaces with a stiff brush in the normal manner.

tions, and remove the c oil corner post from be tween

SERVICE

CAUTION: When servicing unit, shut off all elec-

the top panel and center post. Install the coil corner post and coil center post, and replace all screws.

trical power to unit to avoid shock hazard or injury from rotating parts.

Hot Gas

I. CLEANING

Inspect unit interior at the beginning of each heating and cooling season or as operating conditions require.

A. Evaporator Coil

1. Turn unit power off and install lockout tag. Remove evaporator coil access panel.

2. If EconoMi$er IV or accessory two-position damper is installed, rem ove econom izer or two- position d amper by disconnecting EconoMi$er IV plug and removing mounting screws.

3. Slide filters out of unit.

4. Clean coil using a commercial coil cleaner or dishwasher detergent in a pressurized spray canister. Wash both sides of coil and flush with clean water. For best results, back-flush toward return-air section to remove foreign material.

5. Flush condensate pan after completion.

6. Reinstall economizer or two-position damper and filters.

7. Reconnect wiring.

8. Replace access panels.

B. Condenser Coils

Inspect coils monthly. Clean condenser coils annually, and as required by location and outdoor-air conditions.

Clean 2-row coils as follows:

1. Turn off unit power and install lockout tag.

2. Remove top panel screws on condenser end of unit.

Fig. 43 — Cleaning Condenser Coil

Fig. 44 — Propping Up Top Panel

—41—

Page 42

Fig. 45 — Separating Coil Sections

C. Condensate Drain

Check and clean each year at start of cooling season. In winter, protect against freeze-up.

D. Filters

Clean or replace at start of each heating and cooling season, or more often if operating con di ti ons req uir e it. Repl ace me nt filters must be same dimensions as original filters.

E. Outdoor-Air Inlet Screen

Clean screen with steam or hot water and a mild detergent. Do not use throwaway filters in place of screens.

II. LUBRICATION

A. Compressors

Each compressor is charged with cor rect amount of oil from the factory.

B. Fan Motor Bearings

Fan motor bearings are permanently lubricated. No further lubrication of condenser-fan or evaporator-fan motors is required.

III. CONDENSER-FAN ADJUSTMENT (FIG. 46)

1. Shut off unit power supply and install lockout tag.

2. Remove condenser-fan assembly (grille, motor, motor cover, and fan) and loosen fan hub setscrews.

3. Adjust fan height a s shown in Fig. 46.

4. Tighten setscrews and replace condenser-fan asse mbly.

UNIT VOLTAGE FAN HEIGHT “A” (in.)

208/230 v 2.75

460 v and 575 v 3.50

Fig. 46 — Condenser-Fan Adjustment

IV. BELT/PULLEY ADJUSTMENT

Inspect once each season or sooner if conditions warrant, verifying that belt tension and pulley alignment are correct. Replace belt if required.

V. ECONOMI$ER IV ADJUSTMENT

Refer to Optional EconoMi$er IV section on page 13.

VI. REFRIGERANT CHARGE

Amount of refrigerant charge is listed on unit nameplate (also refer to Table 1). Refer to Bryant Standard Service Techniques Manual, Chapter 1, Refrigerants section.

Unit panels must be in place when unit is operating during charging procedure.

A. No Charge

Locate and r epair any refr iger ant l eak. Use s tan dar d evacu ating techniques. After evacuating system, weigh in the specified amount of refrigerant (refer to Table 1).

B. Low Charge Cooling

Use Cooling Charging Charts, Fig. 47-50. Vary refrigerant until the conditions of the appr opriate cha rt are met. Note tha t charging charts are different from the type normally used. Charts are based on charging the units to the correct superheat for the various operating conditions. Accurate pressure gage and temperature sensing device are required. Connect the pressure gage to the service port on the suction line. Mount the temperature sensing device on the suction line and insulat e it so that outdoor ambient temperature does not affect the reading . Indoor -air cfm must be within the normal oper ating ra nge of the uni t.

C. Perfect Humidity™ System Charging

The system charge for u n its w ith the Perfect Humidity op tion is greater than that of the standard unit alone. The charge for units with this option is indicated on the unit nameplate drawing. Also refer to Fig. 51-53. To charge sy stems using the P erfe ct Humidity dehumidification system, fully evacuate, recover and recharge the system t o the name plate specifie d ch arge lev el.

To check or adjust refrigerant charge on systems using the Perfect Humidity Dehumidification system, charge per Fig. 51-53.

NOTE: When using the charging charts, it is important that only the subcooling/reheat dehumidification coil liquid line solenoid valv e be energized. The subcooling/reheat dehumidification coil liquid line solenoid valve MUST be energized to use the charging charts and the outdoor motor speed controller jumpered to run the fan at full speed.

The charts reference a liquid pressure (psig) and temperature at a point between the condenser coil and the subcooling/reheat dehumidification coil. A tap is provided on the unit to measure liquid pressure entering the subcoo ling/ reheat dehumidification coil.

IMPORTANT: The subcooling mode charging charts (Fig. 51-53) are to be used ONLY with units having the optional Perfect Humidity dehumidification system. DO NOT use standard charts (Fig. 47-50) for units with Perfect Humidity option, and DO NOT use Fig. 51-53 for standard units.

D. To Use Cooling Charging Charts, Standard Units

Take the outdoor ambient tempera ture and re ad the sucti on pressure gage. Refer to appropriate chart to determine what the suction temperature should be. If suction temperature is high, add refrigerant. If suction temperature is low, carefully recover some of the charge. Recheck the suct ion pressure as charge is adjusted.

EXAMPLE (Fig. 47): Circuit 1

Outdoor Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 85 F

Suction Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . .70 psig

Suction Temperature should be . . . . . . . . . . . . . . . . . . 46 F

(Suction Temperature may vary ±5° F.)

—42—

Page 43

Fig. 47 — Cooling Charging Charts, Standard 551B090 Unit

Fig. 48 — Cooling Charging Charts, Standard 551B102 Unit

—43—

Page 44

Fig. 49 — Cooling Charging Charts, Standard 551B120 Unit

Fig. 50 — Cooling Charging Charts, Standard 551B150 Unit

—44—

Page 45

E. To Use Cooling Charging Charts, Units the Perfect Humidity™ Dehumidification System

Refer to the charts (Fig. 51-53) to determine the proper leaving condenser pressure an d temperature.

EXAMPLE: (Fig. 51) Circuit 1

Leaving Condenser Pressure. . . . . . . . . . . . . . . . . . . 300 psig

Leaving Condenser Temperature . . . . . . . . . . . . . . . . . .117 F

NOTE: When using the charging charts, it is important that only the subcooling/reheat dehumidification coil liquid line solenoid valve be energized. The subcooling/reheat dehumidification coil liquid line solenoid valve MUST be energized to use the charging charts and the outdoor motor speed controller jumpered to run the fan at full speed.

VII. REPLACEMENT PARTS

A complete list of replacement parts may be obtained from any Bryant distributor upon reque st.

NOTE: When using the charging charts, it is important that only the subcooling/ reheat dehumidification coil liquid line solenoid valve be energized. The subcooling/reheat dehumidification coil liquid line solenoid valve MUST be energized to use the charging charts and the outdoor motor speed controller jumpered to run the fan at full speed.

Fig. 52 — Cooling Charging Chart, 581B102 and 120

With the Perfect Humidity Dehumidification System

NOTE: When using the charging char ts, it is important that only the subcooling/

reheat dehumidification coil liquid line solenoid valve be energized. The subcooling/reheat dehumidification coil liquid line solenoid valve MUST be energized to use the charging charts and the outdoor motor speed controller jumpered to run the fan at full speed.

Fig. 51 — Cooling Charging Chart, 581B090

With the Perfect Humidity Dehumidification System

NOTE: When using the charging charts, it is important that only the subcooling/ reheat dehumidification coil liquid line solenoid valve be energized. The subcooling/reheat dehumidification coil liquid line solenoid valve MUST be energized to use the charging charts and the outdoor motor speed controller jumpered to run the fan at full speed.

Fig. 53 — Cooling Charging Chart, 581B150

With the Perfect Humidity Dehumidification System

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Page 46

TROUBLESHOOTING

I. UNIT TROUBLESHOOTING

Refer to Tables 30-32 for additional information .

Table 30 — Cooling Troubleshooting

PROBLEM CAUSE REMEDY

Compressor(s) and Condenser Fan Will Not Start.

Compressor(s) Will Not Start but Condenser Fan Runs.

Compressor(s) Cycles (Other Than Normally Satisfying Thermostat).

Compressor(s) Operates Continuously.

Scroll Compressor(s) Makes Excessive Noise.

Excessive Head Pressure. Dirty air filter. Replace filter.

Head Pressure Too Low. Low refrigerant charge. Check for leaks, repair, and recharge.

Excessive Suction Pressure.

Suction Pressure Too Low. Dirty air filter. Replace filter.

Compressor No. 2 Will Not Run.

Power failure. Call power company. Fuse blown or circuit breaker tripped. Replace fuse or reset circuit breaker. Defective thermostat, contactor, transformer,

control relay. Insufficient line voltage. Determine cause and correct. Incorrect or faulty wiring. Check wiring diagram and rewire correctly. Thermostat setting too high. Lower thermostat setting below room temperature. High pressure switch tripped. See problem “Excessive Head Pressure.” Low pressure switch tripped. Check system for leaks, repair, and recharge. Freeze-up protection thermostat tripped. See problem “Suction Pressure Too Low.” Faulty wiring or loose connections in compressor

circuit. Compressor motor(s) burned out, seized, or internal

overload open. Defective overload. Determine cause and replace. One leg of 3-phase power dead. Replace fuse or reset circuit breaker. Determine cause. Refrigerant overcharge or undercharge. Recover refrigerant, evacuate system, and recharge

Defective compressor. Replace and determine cause. Insufficient line voltage. Determine cause and correct. Blocked condenser. Determine cause and correct. Defective overload. Determine cause and replace. Defective thermostat. Replace thermostat. Faulty condenser-fan motor(s) 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. Thermostat set too low. Reset thermostat. Low refrigerant charge. Locate leak, repair, and recharge. Leaking valves in compressor. Replace compressor. Air in system. Recover refrigerant, evacuate system, and recharge. Condenser coil dirty or restricted. Clean coil or remove restriction. Compressor(s) rotating in the wrong direction. Reverse the 3-phase power leads as described in

Dirty condenser coil. Clean coil. Refrigerant overcharged. Remove excess refrigerant. Air in system. Recover refrigerant, evacuate system to 500 microns,

Condenser air restricted or air short-cycling. Determine cause and correct.

Compressor valves leaking. Replace compressor(s). Restriction in liquid tube. Remove restriction. High heat load. Check for source and eliminate. Compressor valves leaking. Replace compressor(s). Refrigerant overcharged. Recover excess refrigerant.

Low refrigerant charge. Check for leaks, repair, and recharge. Metering device or low side restricted. Remove source of restriction. Insufficient evaporator airflow. Increase air quantity. Check filter and replace if

Temperature too low in conditioned area. Reset thermostat. Field-installed filter drier restricted. Replace. Outdoor ambient temperature below 25 F. Install low-ambient kit. Unit in economizer mode. Proper operation; no remedy necessary.

Replace component.

Check wiring and repair or replace.

Determine cause. Replace compressor(s).

to nameplate.

Start-Up section, page 38.

and recharge.

necessary.

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Page 47

Table 31 — Perfect Humidity™ Dehumidification System Subcooling Mode Service Analysis

PROBLEM CAUSE REMEDY

Subcooling Mode (Liquid Reheat) Will Not Energize.

Low System Capacity. Low refrigerant charge or frosted evapora-

Loss of Compressor Superheat Conditions with Subcooling/Reheat Dehumidification Coil Energized.

No power to control transformer from evaporator-fan motor.

No power from control transformer to liquid line solenoid valve.

Liquid line solenoid valve will not operate. 1. Solenoid coil defective; replace.

Liquid line solenoid valve will not open. Valve is stuck closed; replace valve.

tor coil.

Thermostatic expansion valve (TXV). 1. Check TXV bulb mounting, and secure tightly to suction line.

Check power source and evaporator-fan relay. Ensure all wire connections are tight.

1. Fuse open; check fuse. Ensure continuity of wiring.

2. Low-pressure switch open. Cycle unit off and allow lowpressure switch to reset. Replace switch if it will not close.

3. Transformer bad; check transformer.

2. Solenoid valve stuck open; replace.

1. Check charge amount. Charge per Fig. 51-53.

2. Evaporator coil frosted; check and replace low-pressure switch if necessary.

2. Replace TXV if stuck open or closed.

Table 32 — Perfect Humidity Dehumidification Hot Gas Reheat Mode Service Analysis

PROBLEM CAUSE REMEDY

Reheat Mode Will Not Energize. No power to control transformer from

Loss of Compressor Superheat Conditions with Subcooling/Reheat Dehumidification Coil Energized.

Excessive Superheat. Liquid line solenoid valve will not operate. Valve is stuck; replace valve.

evaporator-fan motor. No power from control transformer to hot

gas line solenoid valve.

Hot gas line solenoid valve will not operate. 1. Solenoid coil defective; replace.

Low refrigerant charge or frosted evaporator coil.

Thermostatic expansion valve (TXV). 1. Check TXV bulb mounting, and secure tightly to suction line.

Hot gas line solenoid valve will not close. Valve is stuck; replace valve.

Check power source and evaporator-fan relay. Ensure all wire connections are tight.

1. Fuse open; check fuse. Ensure continuity of wiring.

2. Low-pressure switch open. Cycle unit off and allow lowpressure switch to reset. Replace switch if it will not close.

3. Transformer bad; check transformer.

2. Solenoid valve stuck closed; replace.

1. Check charge amount. Charge per Fig. 51-53.

2. Evaporator coil frosted; check and replace low-pressure switch if necessary.

2. Replace TXV if stuck open or closed.

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Page 48

II. ECONOMI$ER IV TROUBLESHOOTING

See Table 33 for EconoMi$er IV logic. A functional vi ew of the Econ oMi$er IV is shown in Fig. 54.

Typical settings, sensor ranges, and jumper positions are also shown. An EconoMi$er IV simulator program is available from Bryant to help with EconoMi$er IV training and troubleshooting.

A. EconoMi$er IV Preparation

This procedure is used to prepare the EconoMi$er IV for troubleshooting. No troubleshooting or testing is done by performing the following procedure.

NOTE: This procedure requires a 9-v battery, 1.2 kilo-ohm resistor, and a 5.6 kilo-ohm resistor which are not supplied with the EconoMi$er IV.

IMPORTANT: Be sure to record the positions of all potenti ometers before star ting troubleshooting.

1. Disconnect power at TR and TR1. All LEDs should be off. Exhaust fan contac ts should be open.

2. Disconnect device at P and P1.

3. Jumper P to P1.

4. Disconnect wires at T and T1. Place 5.6 kilo-ohm resistor across T and T1.

5. Jumper TR to 1.

6. Jumper TR to N.

7. If connected, remove sensor from terminals SO and +. Connect 1.2 kilo-ohm 4074EJM checkout resistor across terminals S

8. Put 620-ohm resistor across terminals S

and +.

9. Set minimum position, DCV set point, and exhaust potentiometers fully CCW (counterclockwise).

10. Set DCV maximum position potentiometer fully CW (clockwise).

11. Set enthalpy potentiometer to D.

12. Apply power (24 vac) to terminals TR and TR1.

B. Differential Enthalpy

To check differential enthalpy:

1. Make sure Econ o Mi $er IV preparation p ro ce dur e h as been performed.

2. Place 620-ohm resistor across SO and +.

3. Place 1.2 kilo-ohm resistor across S

and +. The Free

Cool LED should be lit.

4. Remove 620-ohm resistor across S

and +. The Free

Cool LED should turn off.

5. Return EconoMi$er IV settings and wiring to normal after completing troubleshooting.

C. Single Enthalpy

To check single en thalpy:

1. Make sure Econ o Mi $er IV preparation p ro ce dur e h as been performed.

2. Set the enthalpy potentiometer to A (fully CCW). The Free Cool LED should be lit .

3. Set the enthalpy potentiometer to D (fully CW). The Free Cool LED should turn off.

4. Return EconoMi$er IV settings and wiring to normal after completing troubleshooting.

D. DCV (Demand Controlled Ventilation) and Power Exhaust

To check DCV and Power Exhaust:

1. Make sure Econ o Mi$ er I V pr epa ra tio n proce dur e h as been performed.

2. Ensure terminals AQ and AQ 1 a r e o pen . The LE D for both DCV and Exhaust should be off. The actuator should be fully closed.

3. Connect a 9-v battery to AQ (positive node) and AQ1 (negative node). The LED for both DCV and Exhaust should turn on. The a ctua tor s hou ld dri ve to be tween 90 and 95% open.

4. Turn the Exhaust potentiometer CW until the Exhaust LED turns off. The LED should turn off when the potentiometer is approximately 90%. The actuator should remain in position.

5. Turn the DCV set point potentiometer CW until the DCV LED turns off. The DCV LED should turn off when the potentiometer is approximately 9 v. The actuator should drive fully closed.

6. Turn the DCV and Exhaust potentiometers CCW until the Exhaust LED turns on. The exhaust contacts will close 30 to 120 seconds afte r the Exhaust LED turns on.

7. Return EconoMi$er IV settings and wiring to norm al after completing troubleshooting.

E. DCV Minimum and Maximum Position

To check the DCV minimum and maximum position:

1. Make sure Econ o Mi$ er I V pr epa ra tio n proce dur e h as been performed.

2. Connect a 9-v battery to AQ (positive node) and AQ1 (negative node). Th e DCV LED should turn on. The actuator should drive to between 90 and 95% open.

3. Turn the DCV Maximum Position potentiometer to midpoint. The actuator should drive to between 20 and 80% open.

4. Turn the DCV Maximum Position potentiometer to fully CCW. The actuator should drive fully closed.

5. Turn the Minimum Position potentiometer to midpoint. The actua tor should drive to betwee n 20 and 80% open.

6. Turn the Minimum Position Potentiometer fully CW. The actuator should drive fully open.

7. Remove the jumper from TR and N. The actuator should drive fully closed.

8. Return EconoMi$er IV settings and wiring to norm al after completing troubleshooting.

F. Supply-Air Input

To check supply-air input:

1. Make sure Econ o Mi$ er I V pr epa ra tio n proce dur e h as been performed.

2. Set the Enthalpy potentiometer to A. The Free Cool LED turns on. The actuator should drive to between 20 and 80% open.

3. Remove the 5.6 kilo-ohm resistor and jumper T to T1. The actuator should drive fully open.

—48—

Page 49

4. Remove the jumper across T and T1. The actuator should drive fully closed.

5. Return EconoMi$er IV settings and wiring to normal after completing troubleshooting.

G. EconoMi$er IV Troubleshooting Completion

This procedur e i s used to retur n t h e E c o noMi$er IV to ope r ation. No troubleshooting or testing is done by performing the following proced ur e.

1. Disconnect power at TR and TR1.

2. Set enthalpy potentiometer to previous setting.

3. Set DCV maximum position po tentiometer to previous setting.

Table 33 — EconoMi$er IV Input/Output Logic

INPUTS OUTPUTS

Demand Control

Ventilation (DCV)

Below set (DCV LED Off)

Above set (DCV LED On)

*For single enthalpy control, the module compares outdoor enthalpy

to the ABCD set point.

†Power at N terminal determines Occupied/Unoccupied setting:

24 vac (Occupied), no power (Unoccupied).

**Modulation is based on the supply-air sensor signal.

††Modulation is based on the DCV signal.

High (Free Cooling LED Off)

Low (Free Cooling LED On)

High (Free Cooling LED Off)

Low (Free Cooling LED On)

Enthalpy*

Outdoor Return

Low On On On On Minimum position Closed

High On On On Off Modulating** (between min.

Low On On On On Modulating†† (between min.

High On On On Off Modulating*** Modulating†††

Y1 Y2

On Off On Off Off Off Off Off

On Off Off Off Off Off Off Off Minimum position Closed

On Off On Off Off Off Off Off

On Off Off Off Off Off Off Off

4. Set minimum position, DCV set point, and exhaust potentiometers to previous settings.

5. Remove 620-ohm resistor from terminals S

6. Remove 1.2 kilo-ohm checkout resistor from terminals S

and +. If used, reconnect sensor from termi-

nals SO and +.

7. Remove jumper from TR to N.

8. Remove jumper from TR to 1.

9. Remove 5.6 kilo-ohm resistor from T and T1. Reconnect wires at T and T1.

10. Remove jumper from P to P1. Rec onnect device at P and P1.

11. Apply power (24 vac) to terminals TR and TR1.

Compressor N Terminal†

Stage1Stage

position and full-open)

position and DCV maximum)

***Modulation is based on the greater of DCV and supply-air sensor

signals, between minimum position and either maximum position (DCV) or fully open (supply-air signal).

†††Modulation is based on the greater of DCV and supply-air sensor

signals, between closed and either maximum position (DCV) or fully open (supply-air signal).

Occupied Unoccupied

Damper

Modulating** (between closed and full-open)

Modulating†† (between closed and DCV maximum)

and +.

Fig. 54 — EconoMi$er IV Functional View

—49—

Page 50

Access panels

Barometric flow capacity 16 Charging chart, refrigerant 43-45 Clearance 2, 5 CO2 sensor Configuration 20 Settings 18, 20 Compressor Lubrication 42 Mounting 38 Rotation 38 Condensate drain Cleaning 42 Location 2, 4 Condenser coil 6 Cleaning 41 Condenser fan 6 Adjustment 42 Control circuit Wiring 11 Wiring raceway 11 Convenience outlet 13 Demand ventilation control 19 Dehumidification 20 Dimensions 3, 5 Ductwork 1 EconoMi$er IV 13-20, 48, 49 Adjustment 42 Components 14 Damper movement 19 Wiring 15 Electrical connections 7 Electrical data 8-10 Electric heaters 10 Enthalpy changeover set points 18 Evaporator coil 6 Cleaning 41 Evaporator fan motor 6 Lubrication 42 Motor data 22, 23 Performance 24-37 Pulley adjustment 22 Pulley setting 6, 22 Speed 6 Factory-installed options Convenience outlet 13 Disconnect switch 11 EconoMi$er IV 13-20 Manual outdoor air damper 13 Perfect Humidity™ dehumidification system 11 , 12 Filter Cleaning 42 Installation 15 Size 6 Freeze protection thermostat 6 Heat anticipator settings 11 High flow valves 38 High pressure switch 6 Horizontal units 1, 2 Humidistat 12 Indoor air quality sensor 18 Low pressure switch 6 Manual outdoor air damper 13 Mounting Unit 2 Non-fused disconnect switch 11 Operating sequence Cooling 39 EconoMi$er IV 39 Heating 39 Perfect Humidity™ dehumidification package 39-41 Outdoor air hood 13-15 Outdoor air temperature sensor 14 Outdoor air inlet screens Cleaning 42

INDEX

Perfect Humidity™ dehumidification system 11, 12, 21, 39-42, 45, 47 Physical data 6 Power supply Wiring 7 Pressure, drop EconoMi$er IV 23 Electric heat 23 Perfect Humidity dehumidification 21 Pressure switches High pressure 6 Low pressure 6 Pre-start-up 38 Refrigerant Charge 6, 42 Type 6 Refrigerant service ports 38 Replacement parts 45 Return air filter 6, 38 Return air temperature sensor 17 Rigging unit 2, 4 Roof curb Assembly 1 Dimensions 3 Connector package 3 Leveling tolerances 4 Weight 6 Safety considerations 1 Safety relief 39 Service 41-45 Service ports 38 Slab mount 1 Start-up 38-41 Start-up checklist CL-1 Supply air temperature sensor 14 Thermostat 11 Troubleshooting 46-49 Ventilation 39 Weight Corner 5 EconoMi$er IV 5, 6 Perfect Humidity dehumidification 6 Unit 4-6 Wiring EconoMi$er IV 15 Humidistat 12 Perfect Humidity system 12 Power connections 7

Page 51

Page 52

START-UP CHECKLIST

(Remove and Store in Job File)

I. PRELIMINARY INFORMATION

MODEL NO.: ______________________________________ SERIAL NO.: _______________________________________ ____ DATE:_____________________________________________ TECHNICIAN: _________________________________________ BUILDING LOCATION: ________ ____________________

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



VERIFY JOBSITE VOLTAGE AGREES WITH VOLTAGE LISTED ON RATING PLATE



VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTALLATION INSTRUCTIONS



CHECK THAT ALL ELECTRICAL CONNECTIONS AND TERMINALS ARE TIGHT



CHECK THAT RETURN (INDOOR SECTION) AIR FILTERS ARE CLEAN AND IN PLACE



VERIFY THAT UNIT INSTALLATION IS LEVEL



CHECK FAN WHEEL AND PROPELLER FOR LOCATION IN HOUSING AND ORIFICE AND CHECK THAT SETSCREW IS TIGHT



CHECK PULLEY ALIGNMENT AND BELT TENSION PER INSTALLATION INSTRUCTIONS



CHECK TO ENSURE THAT ELECTRICAL WIRING IS NOT IN CONTACT WITH REFRIGERANT LINES OR SHARP METAL EDGES

III. START-UP

ELECTRICAL

SUPPLY VOLTAGE L1-L2 L2-L3 L3-L1 CIRCUIT 1 COMPRESSOR AMPS L1 L2 L3 CIRCUIT 2 COMPRESSOR AMPS L1 L2 L3 EV APORATOR FAN AMPS L1 L2 L3

CUT ALONG DOTTED LINE

TEMPERATURES

OUTDOOR-AIR TEMPERATURE DB WB RETURN-AIR TEMPERATURE DB WB COOLING SUPPLY AIR DB WB

PRESSURES

REFRIGERANT SUCTION, CIRCUIT 1 PSIG AT F (AT SERVICE PORT) REFRIGERANT SUCTION, CIRCUIT 2 PSIG AT F (AT SERVICE PORT) REFRIGERANT DISCHARGE, CIRCUIT 1 PSIG AT F (CONDENSER LIQUID LINE OUTLET TUBE ) REFRIGERANT DISCHARGE, CIRCUIT 2 PSIG AT F (CONDENSER LIQUID LINE OUTLET TUBE )



VERIFY THAT 3-PHASE SCROLL COMPRESSOR IS ROTATING IN THE CORRECT DIRECTION



VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS ON PAGES 43-45.

CUT ALONG DOTTED LINE

Bryant DURAPAC PLUS 551B Installation, Start-up And Service Instructions Manual

Specifications and Main Features

Frequently Asked Questions

User Manual