Bryant DURAPAC PLUS 581A User Manual

installation, start-up and service instructions

SINGLE PACKAGE ROOFTOP ELEC TRIC COOLING/GAS HEATING UNITS

Cancels: II 581A-210-1 II 581A-210-2

Dura

Pac

581A

Plus Series

Sizes 210-300

18 to 25 Tons

10/1/05

CONTENTS

Page

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

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-16

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

II. Step 2 — Remove Shipping Rails. . . . . . . . . . . . . . . 2

III. Step 3 — Rig and Place Unit. . . . . . . . . . . . . . . . . . . 2

IV. Step 4 — Field Fabricate Ductwork . . . . . . . . . . . . . 9

V. Step 5 — Make Unit Duct Connections . . . . . . . . . . 9

VI. Step 6 — Install Flue Hood and Inlet Hood . . . . . . 10

VII. Step 7 — Trap Condensate Drain . . . . . . . . . . . . . . 10

VIII. Step 8 — Install Gas Piping . . . . . . . . . . . . . . . . . . 10

IX. Step 9 — Make Electrical Connections . . . . . . . . . 11

X. Step 10 — Install Outdoor-Air Hood. . . . . . . . . . . . 12

XI. Step 11 — Position Optional Power

Exhaust or Barometric Relief Damper Hood . . . 16

XII. Step 12 — Non-Fused Disconnect . . . . . . . . . . . . . 16

XIII. Step 13 — Install All Accessories . . . . . . . . . . . . . 16

PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17-36

SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36-46

TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . .47-51

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 a ir-conditioning equip ment.

Untrained personnel can perform the basic maintenance functions of cl eaning coils and filters a nd replacing filters. All other operations should be performed by trained service personnel. When working on air-conditioning equipment, observe precautions in the literature, tags and labels attached to the unit, and other safety precautions that may apply.

Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for unbrazing operations. Have fire extinguishers available for all brazing opera tions.

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

WARNING:

1. Improper installation, adjustment, alteration, service, or maintenance can cause property damage, personal injury, or loss of life. Refer to the User’s Information Manual provided with this unit for more details.

2. Do not store or u se ga sol ine or o th er fl amm able vapors and liquids in the vicinity o f this or any other appliance.

What to do if yo u sm ell gas:

1. DO NOT try to light any appliance.

2. DO NOT touch an y electrical switch, or use any phone in your building.

3. IMMEDIATELY call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.

4. If you cannot reach your gas supplier, call the fire department.

WARNING: Disconnect gas piping from unit when pressure testing at pressure greater than 0.5 psig. Pressures greater than 0.5 psig will cause gas valve damage resulting in hazardous c ondition. If gas valve is subjected to pressure greater than 0.5 psig, it must be replaced before use. When pressure testing fieldsupplied gas piping at pressures of 0.5 psig or less, a unit connected to such piping must be isolated by closing the manual gas valve(s).

IMPORTANT: Units have high ambient temperature operating limits. If limits are exceeded, the units will automatically lock the compressor out of oper ation. Manual reset will be required to restart the compressor.

INSTALLATION

I. STEP 1 — PROVIDE UNIT SUPPORT

A. Roof Curb

Assemble or install accessory roof curb in accordance with instructions shipped with this accessory. See Fig. 1. Install insulation, cant strips, roofing, and counter flashing as shown. Ductwork can be installed to roof curb before unit is set in place. Ductwork must be attached to curb and not to the unit. Curb m u st be le v el . T h is is ne ce ssary to permit un it drain to function properly. Unit leveling tolerance is ± per linear ft in any direction. Re fer to Accessory Roof Curb Installation Instructions for additional information as required. When accessory roof curb is used, unit may be installed on class A, B, or C roof covering materia l. Bryant roof curb accessories are for flat roofs or slab mounting.

/16 in.

IMPORTANT: The gasketing of the unit to the roof curb is critical for a watertight seal. Install gasket with the roof curb as shown in Fig. 1. Improperly applied gasket can also result in air leaks and poor unit performance. Do not slide unit to position on roof curb.

B. Alternate Unit Support

When a curb cannot be used, install unit on a noncombustible surface. Support unit with sleepers, using unit curb support area. If sleepers cannot be used, support long sides of unit with a minimum of 3 equally spaced 4-in. x 4-in. pads on each side.

C. Slab Mount (Horizontal Units Only)

Provide a level concrete slab tha t extends a min imum of 6 in. beyond uni t cabinet. Ins tall a gravel apr on 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.

II. STEP 2 — REMOVE SHIPPING RAILS

Remove shipping rails prior to lowering unit onto roof curb. See Fig. 2. The rails are attached to the unit at both the return end and c ondenser end. Remove the screws from both ends of each rail. B e careful not to drop the rails o nto any surface that could be damaged. Discard the rails. It is important to replace the screws into the unit to avoid any air or water leakage.

CAUTION: Do not allow the shipping rail to drop on the roof surface. Damage to the roof surface may result.

III. STEP 3 — RIG AND PLACE UNIT

Inspect unit for transportation damage. See Tables 1-3 for physical data. File any claim with transportation agency.

Four lifting holes are provided in the unit base rails as shown in Fig. 3. Refer to rigging inst ructions on unit.

A. Positioning

Maintain clearance, per Fig. 4, aroun d and abo ve u nit to provide minimum distance from combustible materials, proper airflow, and service access.

Do not install unit in an indoor location. Do not locate air inlets near exhaust vents or other sources of contaminated air. For proper unit operation, adeq uate com bustion and ventilation air must be provided in accordance with Section 5.3 (Air for Combustion and Ventilation) of the National Fuel Gas Code, ANSI Z223.1 (American National Standards Institute).

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

Locate mechanical draft system flue assembly at least 4 ft from any opening through which combustion products could enter the buil ding, and at le ast 4 ft fr om any adj acen t buil ding (or per local codes). When unit is lo cated adjacent to public walkwa ys , flue as sembly must be at l east 7 ft a bove g rade .

B. Roof Mount

Check building codes for weight distribution requirements. Unit operating weight is shown in Table 1.

C. Installation Onto Curb

The 581A units are designed to fit on the accessory full perimeter curb. Correct placement of the unit onto the curb is critical to op erating performance. To aid in correct positioning,

/8-in. diameter locating holes have been added to the unit base rails. When placing the unit, these holes should line up with the roof curb edge as shown in Fig. 5 and 6, to assure proper du ct ope nin g a lign men t. For placement o n the roof curb, use the alignment holes located approximately 2-in. from the e nd of the base r ail on the return e nd of the unit. See labels on the side of the unit for more details.

CAUTION: All panels must be in place when rigging. Unit is not designed for handling by fork truck. Damage to unit may result.

Do not drop unit; keep upr ight. Use sprea der bars over unit to prevent sling or cable damage. Rollers may be used to move unit across a roof. Level by using unit frame a s a reference; leveling tolerance is ±

/16 in. per linear ft in a ny di re ction. See Fig. 3 for additional information. Unit rigging weight is shown in Fig. 3.

CAUTION: Do not slide unit to position it when it is sitting on the curb. Curb gasketing material may be damaged and leaks may result.

—2—

Fig. 1 — Roof Curb Details

—3—

SHIPPING RAILS

Fig. 2 — Shipping Rail Removal

UNIT SIZE

581A

210 3358 63.9 34.0 30.5 240 3380 63.9 34.5 30.5 300 3769 67.8 35.0 35.0

MAX WEIGHT

(lb)

CENTER OF GRAVITY

(in.)

XYZ

Fig. 3 — Rigging Details

—4—

476

[216]

387

[176]

lb [kg]

751

[341]

CORNER WEIGHT

610

[277]

[762]

487

400

760

625

[221]

[181]

[345]

[283]

[762]

571

434

859

662

[260]

[198]

[390]

[300]

[876]

WXYZ

UNIT HEIGHT CENTER OF GRAVITY LOCATION

lb [kg] in. [mm] in. [mm] in. [mm] in. [mm] A B C D

WEIGHT

OPERATING

(Low Heat Gas)

581A

UNIT SIZE

[864]

[851]

[1638]

[1476]

210 2224 [1008]

[876]

[1626]

[1727]

[1476]

[1781]

300 2526 [1146]

240 2272 [1030]

Fig. 4 — Base Unit Dimensions

″ [8]

Utility Meters/Regulators/Reliefs

(Without Curb)

6′-6″ [1981] Economizer Removal

6′-0″ [1829] Condenser Air

8′-0″ [2438] Coil Removal

Bryant Application Engineering Department.

roof curb only. If unit is mounted side supply, it is recom-

mended the ducts must be supported by cross braces as

done on accessory roof curb.

and the damper/power exhaust as stated in Note #3, a

25% outdoor air option, aluminum coils, and standard

drive. For weights of optional equipment consult product

NOTES:

data book.

1. For outdoor use only.

2. Weights shown are for 581A (low heat) unit with manual

3. Do not locate adjacent units with flue discharge facing

Front Side: 3′-0″ [915] Service

economizer inlet.

Min Clearances to be:

Right Side: 6′-0″ [1829] Condenser Air

4. For smaller service and operational clearances contact

5. Downshot ducts designed to be attached to accessory

Flue Outlet: 4′-0″ [1219] Combustible Surfaces/

Bottom: 1′-2″ [356] Combustible Surface

To p: 6 ′-0″ [1829] Condenser Fan

Rear Side: 6′-0″ [1829] Condenser Air

Left Side: 10′-0″ [3048] Outside Air

removable fence or barricade requires no clearance.

6. Dimensions in [ ] are in millimeters.

on each side for top cover drip edge.

7. With the exception of clearance for the condenser coil

8. Dimensions are from outside of base rail. Allow 0

—5—

Table 1 — Physical Data

UNIT 581A 210 240 300 NOMINAL CAPACITY (tons) 18 20 25 OPERATING WEIGHT (lb)

Al/Al* 2224 2272 2526

COMPRESSOR

Quantity 332 Number of Refrigerant Circuits 332 Oil (ounces) Ckt A...Ckt B...Ckt C 68...68...90 90...90...90 110...110...N/A

REFRIGERANT TYPE R-22 R-22 R-22

Expansion Device TXV TXV TXV

Operating Charge (lb) Circuit A 13.1 13.8 21.8 Circuit B 12.7 13.9 20.3 Circuit C 15.2 15.5 N/A

CONDENSER FAN

Nominal Cfm (Total, all fans) 14,000 14,000 21,000

Quantity...Diameter (in.) 4...22 4...22 6...22

Motor Hp...Rpm

Watts Input (Total) 1400 1400 2100 CONDENSER COIL

Rows...Fins/in. 2...17 2...17 2...17

Total Face Area (sq ft) 57.78 57.78 66.67 EVAPORATOR FAN

Quantity...Size 2...15x11 2...15x11 2...15x11

Type D riv e Belt Belt Belt

Nominal Cfm 7000 8000 10,000

Motor Bearing Type Ball Ball Ball

Maximum Allowable Fan Rpm 1400 1400 1400 EVAPORATOR COIL

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

Total Face Area (sq ft) 23.33 23.33 27.22 FURNACE SECTION

Rollout Switch Cutout Temp (F) 225 225 225

Burner Orifice Diameter (in. ...drill size) 0.136...29 0.136...29 0.136...29

Gas Natural Natural Natural

Thermostat Heat Anticipator Setting Stage 1 (amps) 0.98 0.98 0.98 Stage 2 (amps) 0.44 0.44 0.44

Gas Input (Btuh) HIGH HEAT Stage 1 317,000 317,000 317,000

Efficiency (Steady State) % Vertical 82 82 82

Stage 2 400,000 400,000 400,000

Temperature Rise Range (F) 25-55 25-55 25-55

Gas Input (Btuh) MEDIUM HEAT Stage 1 281,000 281,000 281,000

Efficiency (Steady State) % Vertical 81 81 81

Stage 2 365,000 365,000 365,000

Temperature Rise Range (F) 25-55 25-55 25-55

Gas Input (Btuh) LOW HEAT Stage 1 199,000 199,000 199,000

Efficiency (Steady State) % Vertical 82 82 82

Stage 2 250,000 250,000 250,000

Temperature Rise Range (F) 15-45 15-45 15-45

Manifold Pressure

Natural Gas (in. wg) Vertical 3.00 3.00 3.00

Natural Gas (in. wg) Horizontal 2.95 2.95 2.95 Gas Valve Quantity 111 Gas Valve Pressure Range (in. wg) 5.5-13.0 5.5-13.0 5.5-13.0

Min-Max Allowable (psig) .235-.469 .235-.469 .235-.469 Field Gas Connection Size (in. FPT)

HIGH-PRESSURE SWITCH (psig)

Cutout 426 426 426 Reset (Auto) 320 320 320

OUTDOOR-AIR INLET SCREENS

Quantity...Size (in.) 3...20x25 3...20x25 3...20x25

RETURN-AIR FILTERS

Quantity...Size (in.) 9...16x25 9...16x25 9...18x24

LEGEND *Aluminum evaporator coil and aluminum condenser coil. N/A — Not Applicable

TXV — Thermostatic Expansion Valve

/4...1100

—6—

Table 2 — Fan Motor and Drive Data — Vertical Supply/Return

581A

208/230

and 460 v

575 v

208/230

and 460 v

575 v

208/230

and 460 v

575 v

LOW RANGE

210 240 300

Motor Hp 3.7 3 5 5 7.5 7.5 Motor Nominal Rpm 1725 1725 1745 1745 1745 1745 Maximum Continuous Bhp 4.25 3.45 5.75 5.75 8.63 8.63 Maximum Continuous Watts 3698 3149 4900 4900 7267 7267 Motor Frame Size 56HZ 56HZ S184T 184T S213T S213T Motor Shaft Diameter (in.) Fan Rpm Range 647-886 810-1072 949-1206 949-1206 941-1176 941-1176 Motor Pulley Min. Pitch Diameter (in.) 2.7 3.1 3.7 3.7 4.8 4.8

11/

13/

Motor Pulley Max. Pitch Diameter (in.) 3.7 4.1 4.7 4.7 6.0 6.0 Blower Pulley Pitch Diameter (in.) 7.2 6.6 6.8 6.8 8.9 8.9 Blower Pulley Shaft Diameter (in.) 1.1875 1.1875 1.1875 1.1875 1.1875 1.1875 Blower Pulley Type Fixed Fixed Fixed Fixed Fixed Fixed Pulley Center Line Distance (in.) 11.293-13.544 11.286-14.475 9.81-13.055 9.81-13.055 9.025-12.179 9.025-12.179 Belt, Quantity...Type...Length (in.) 1...BX...38 1...BX...38 1...BX...38 1...BX...38 1...BX...42 1...BX...42 Speed Change Per Turn — Moveable Pulley (rpm) 48 52 51 51 47 47 Moveable Pulley Maximum Full Turns 6 6 6666 Factory Speed Setting (rpm) 767 941 1078 1078 1059 1059

HIGH RANGE Motor Hp Motor Nominal Rpm 1745 1745 1745 1745 1745 1745 Maximum Continuous Bhp Maximum Continuous Watts Motor Frame Size S184T 184T S213T S213T S215T S215T Motor Shaft Diameter (in.) Fan Rpm Range Motor Pulley Min. Pitch Diameter (in.) 3.7 3.7 4.8 4.8 4.3 4.3 Motor Pulley Max. Pitch Diameter (in.) Blower Pulley Pitch Diameter (in.) Blower Pulley Shaft Diameter (in.) 1.1875 1.1875 1.1875 1.1875 1.1875 1.1875 Blower Pulley Type Pulley Center Line Distance (in.) Belt, Quantity...Type...Length (in.) 1...BX...38 1...BX...38 1...BX...42 1...BX...42 2...BX...38 2...BX...38 Speed Change per Turn — Moveable Pulley (rpm) Moveable Pulley Maximum Full Turns Factory Speed Setting (rpm) 1018 991 1059 1059 1156 1156

5 5 7.5 7.5 10 10

5.75 5.75 8.63 8.63 11.5 11.5

4900 4900 7267 7267 9582 9582

11/

897-1139 873-1108 941-1176 941-1176 1014-1297 1014-1297

11/

13/

4.7 4.7 6.0 6.0 5.5 5.5

7.2 7.4 8.9 8.9 7.4 7.4

Fixed Fixed Fixed Fixed Fixed Fixed

9.81-13.055 9.81-13.055 9.025-12.179 9.025-12.179 9.025- 2.179 9.025-12.179

48 47 47 47 57 57

6 6 6666

LEGEND Bhp — Brake Horsepower

—7—

Table 3 — Fan Motor and Drive Data — Horizontal Supply/Return

581A

208/230

and 460 v

575 v

208/230

and 460 v

575 v

208/230

and 460 v

575 v

LOW RANGE

210 240 300

Motor Hp 3.7 3 5 5 7.5 7.5 Motor Nominal Rpm 1725 1725 1745 1745 1745 1745 Maximum Continuous Bhp 4.25 3.45 5.75 5.75 8.63 8.63 Maximum Continuous Watts 3698 3149 4900 4900 7267 7267 Motor Frame Size 56HZ 56HZ S184T 184T S213T S213T Motor Shaft Diameter (in.) Fan Rpm Range 896-1227 863-1141 1113-1414 1113-1414 941-1176 941-1176 Motor Pulley Min. Pitch Diameter (in.) 2.7 3.1 3.7 3.7 4.8 4.8

11/

13/

Motor Pulley Max. Pitch Diameter (in.) 3.7 4.1 4.7 4.7 6.0 6.0 Blower Pulley Pitch Diameter (in.) 5.2 6.2 5.8 5.8 8.9 8.9 Blower Pulley Shaft Diameter (in.) 1.1875 1.1875 1.1875 1.1875 1.1875 1.1875 Blower Pulley Type Fixed Fixed Fixed Fixed Fixed Fixed Pulley Center Line Distance (in.) 11.293-13.544 11.286-14.475 9.81-13.055 9.81-13.055 9.025-12.179 9.025-12.179 Belt, Quantity...Type...Length (in.) 1...BX...35 1...BX...38 1...BX...35 1...BX...35 1...BX...42 1...BX...42 Speed Change Per Turn — Moveable Pulley (rpm) 66 56 60 60 47 47 Moveable Pulley Maximum Full Turns 6 6 6666 Factory Speed Setting (rpm) 1062 1002 1264 1264 1059 1059

HIGH RANGE Motor Hp Motor Nominal Rpm 1745 1745 1745 1745 1745 1745 Maximum Continuous Bhp Maximum Continuous Watts Motor Frame Size S184T 184T S213T S213T S215T S215T Motor Shaft Diameter (in.) Fan Rpm Range Motor Pulley Min. Pitch Diameter (in.) 3.7 4.3 5.4 5.4 4.3 4.3 Motor Pulley Max. Pitch Diameter (in.) Blower Pulley Pitch Diameter (in.) Blower Pulley Shaft Diameter (in.) 1.1875 1.1875 1.1875 1.1875 1.1875 1.1875 Blower Pulley Type Pulley Center Line Distance (in.) Belt, Quantity...Type...Length (in.) 1...BX...35 1...BX...38 1...BX...42 1...BX...42 1...BX...38 1...BX...38 Speed Change per Turn — Moveable Pulley (rpm) Moveable Pulley Maximum Full Turns Factory Speed Setting (rpm) 1264 1164 1218 1218 1156 1156

5 5 7.5 7.5 10 10

5.75 5.75 8.63 8.63 11.5 11.5

4900 4900 7267 7267 9582 9582

11/

1113-1414 1042-1285 1096-1339 1096-1339 1014-1297 1014-1297

11/

13/

4.7 5.3 6.6 6.6 5.5 5.5

5.8 7.2 8.6 8.6 7.4 7.4

Fixed Fixed Fixed Fixed Fixed Fixed

9.81-13.055 9.81-13.055 9.025-12.179 9.025-12.179 9.025-12.179 9.025-12.179

60 48 49 49 57 57

6 6 6666

LEGEND Bhp — Brake Horsepower

—8—

ALIGNMENT

HOLE

(IN BASE RAIL)

ALIGNMENT

HOLE SHOULD

LINE UP WITH

ROOF CURB

EDGE FLANGE

WARNING: For vertical supply and return units, tools or parts could drop into ductwork and cause an injury. Insta ll a 90-de gree t urn in th e return ductwor k between the unit and the conditioned space. If a 90-degree elbow cannot be installed, then a grille of sufficient strength and density should be installed to prevent objects from falling into the conditioned space.

EDGE FLANGE

Fig. 5 — Alignment Hole Details

SUPPLY

OPENING

CURB SUPPLY OPENING

ALIGNMENT HOLES FOR

CURB-BOTH

SIDES

RETURN

OPENING

CURB RETURN OPENING

ROOF CURB

Fig. 6 — Alignment Hole Location

IV. STEP 4 — FIELD FABRICATE DUCTWORK

On vertical units, secure all ducts to roof curb and building structure. Do not connect ductwork to unit. For hori zont al applications, field-supplied flanges should be attached to horizontal discharge openings and all ductwork secured to the flanges. Insulate and weatherproof all external ductwork, joints, and roof openings with counter flashing and mastic in accordance with applicable codes.

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

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

A minimum clearance is not required around ductwork. Cabinet return-air static pressure (a negative condition) shall not exceed 0.35 in. wg with economizer or 0.45 in. wg without economizer.

These units are designed for a minimum continuous returnair temperature in heating of 50 F (dry bu lb), or an int e rmittent operati on down to 45 F (dry bulb), suc h as when used with a night set-back thermostat.

To operate at lower return-air temperatures, a field-supplied outdoor-air temperature control must be used to initiate both stages of heat when the temperature is below 45 F. Indoor comfort may be compromised when these lower air temperatures are used with insufficient heating temperature rise.

V. STEP 5 — MAKE UNIT DUCT CONNECTIONS

A. Vertical Configuration

Unit is shipped for vertical supply and return duct connections. Ductwork openings are shown in Fig. 1 and 4. Duct connections for vertical configuration are shown in Fig. 7. Field-fabricated concentric ductwork may be connected as shown in Fig. 8 and 9. The unit is designed to attach the ductwork to the roof curb. Do not attach duct directly to the unit.

B. Horizontal Applications

Horizontal units are shipped with outer panels that allow for side by side horizontal duct connections. If specified during ordering, the unit will be shipped with the vertical duct openings blocked of f from the factory, ready for side suppl y installation. If the horizontal supply/return option was not specified at time of ordering th e unit, a fiel d-inst alled ac cessory kit is required to convert the vertical unit into a horizontal supply configuration.

Installation of the duct block-off covers should be completed prior to placing the unit unless sufficient side clearance is available. A minimum of 66 in. is required between the unit and any obstruction to install the duct block-off cover s. Side supply duct dimensions and locations are shown on Fig. 4. Install ductwork to horizontal duct flange connections on side of unit.

ECONOMIZER

SEE NOTE

AIR

NOTE: Do not drill in this area; damage to basepan may result in wate leak.

SEE NOTE

HEAT EXCHANGER

AIR

OUT

Fig. 7 — Air Distribution — Vertical Supply/Return

ECONOMIZER

HEAT

AIR OUT

SEE NOTE

EXCHANGER

SEE NOTE

AIR OUT

NOTE: Do not drill in this area; damage to basepan may result in water leak.

AIR IN

Fig. 8 — Air Distribution — Concentric Duct

—9—

NOTE: Dimensions A, A′, B, and B′ are obtained from field-supplied

ceiling diffuser.

Shaded areas indicate block-off pans.

Fig. 9 — Concentric Duct Details

VI. STEP 6 — INSTALL FLUE HOOD AND INLET HOOD

Flue hood (smaller hood), inlet hood (larger hood), and screens are shipped inside the unit in the fan section. To install, remove the heat panel. The flue hood is attached to the heat section panel from the ou tside usi ng the scre ws pr ovided. See Fig. 10.

The inlet h oo d is i nst a lle d by in s er tin g the h oo d t hro ug h the back of the heat panel. Attach the hood by inserting the screws provided through the clearance holes in the heat panel and into the intake hood.

Install the screens into both hoods using the screws and retaining nuts provided with the unit.

Attach the cover of the observation hole o n the intake hood and then replace the heat panel onto the unit to complete the installation.

NOTE: When properly installed, the flue hood will line up with the combustion fan housing. See Fig. 11.

VII. STEP 7 — TRAP CONDENSATE DRAIN

See Fig. 12 for drain location. One

/4-in. half coupling is provided outside unit evaporator section for condensate drain connection. A trap at least 4-in. deep must be used. See Fig. 13.

All units must have an external trap for condensate drainage. 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.

VIII. STEP 8 — INSTALL GAS PIPING

Unit is equipped for use with natural gas. Refer to local building codes, or in the absence of local codes, to ANSI (American National Standards Institute) Z223.1-latest year and addendum Z223.1A-latest year entitled NFGC. In Canada, installation must be in accordance with the CAN1.B149.1 and CAN1.B149.2 installation codes for gas burning appliances.

Support gas piping. F or example , a

/4-in. gas pipe must have one field-fabr icated support beam every 8 ft. Therefore, an 18-ft long gas pipe would have a minimum of 3 support beams.

Install field-supplied manual gas shutoff valve with a

-in. NPT pressure tap for test gage connection at unit. The

pressure tap is located on the gas manifold, adjacent to the gas valve. Field gas piping must include sediment trap and union. See Fig. 14.

FLUE HOOD

INLET HOOD

Fig. 10 — Flue and Inlet Hood Locations

COMBUSTION FAN HOUSING

HEAT EXCHANGER SECTION

INDUCED-DRAFT MOTOR

MAIN BURNER SECTION

Fig. 11 — Combustion Fan Housing Location

—10—

WARNING: Do not pressure test gas supply while connected to unit. Always disconnect union before servicing. A hazardous condition could occu r resulting in serious injury.

IMPORTANT: Natural gas pressure at unit gas connection must not be less than 5.5 in. wg or greater than 13.0 in. wg.

Size gas-supply piping for 0.5-in. wg maximum pressure drop. Do not use supply pipe smaller than unit gas connection.

Fig. 12 — Condensate Drain Details

IX. STEP 9 — MAKE ELECTRICAL CONNECTIONS

A. Field Power Supply

Unit is factory wired for voltage shown on unit nameplate. Be sure to check for correct voltage.

When installi ng u nit s, provide disconnect per NEC (N ati ona l Electrical Code) of adequate size (MOCP [Maximum Overcurrent protection ] of unit is on the infor mative plate). See Tables 4A and 4B. All field wi ring must comply with NEC and local codes. Size wire based on MCA (Minimum Circuit Amps) on the unit infor mative plate. See Fig. 15 for power wiring connection to the unit power terminal block and equipment ground.

Route power and ground lines through control box end panel or unit basepan (see Fig. 4) to connections as shown on unit wiring diagram and Fig. 15.

CAUTION: The correct power phasing is critical to the operation of the scroll compressors. An incorrect phasing will resu lt i n com pre ssor shut down on th erma l overload and possible damage to compressor. Should this occur, power phase correction must be made to the incoming power.

WARNING: Unit cabinet must have an uninterrupted, 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, ANSI/NFPA (National Fire Protection Association), latest edition, and local electrical codes. Do not use gas piping as an electrical ground. Failure to follow this warning could result in the install er being liable for pers onal inj ury of others.

NOTE: Trap should be deep enough to offset maximum unit static difference. A 4-in. trap is recommended.

Fig. 13 — Condensate Drain Piping Details

Field wiring must conform to temperature limitations for type “T” wire. All field wiring must comply with NEC and local requirements.

Operating voltage to compressor must be within voltage range indicated on unit nameplate. On 3-phase units, voltages between phases must be balanced within 2%.

Unit failure as a res ult of ope ra tio n o n imp ro per line volt age or excessive phase imbalance constitutes abuse and may cause damage to electrical components.

B. Field Control Wiring

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

Route thermostat cable or equivalent single leads of colored wire from subbase terminals through conduit into unit to low-voltage connections as shown on unit label wiring diagram and in Fig. 16.

NOTE: For wire runs up to 50 ft, use no. 18 AWG (American Wire Gage) insulated wire (35 C minimum). For 50 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 directly connected a t the thermos tat and wi ll req uire a j unction box and s plice a t the thermostat.

Fig. 14 — Field Gas Piping

—11—

LEGEND

EQUIP — Equipment GND — Ground NEC — National Electrical Code TB — Terminal Board

NOTE: The maximum wire size for TB1 is 2/0.

Fig. 15 — Field Power Wiring Connections

THERMOSTAT ASSEMBLY

REMOVABLE JUMPER

TB2J11

Y1 Y2

W1 W2 G C

W1 W2 G C X

Fig. 16 — Field Control Thermostat Wiring

Set heat anticipator settings as follows:

VOLTAGE

All 0.15 0.30

STAGE 1

(W1) ON

STAGE 1 AND 2

(W1 AND W2) ON

Settings may be changed slightly to provide a greater degree of comfort for a particular installation.

X. STEP 10 — INSTALL OUTDOOR-AIR HOOD

Perform the following procedure to install the outdoor-air hood on units equipped with an economizer, two-position damper, or manual outdoor air damper:

1. Remove blank panel from return end of unit (hood section). Save the screws. See Fig. 17 for shipping location of compo n en ts.

2. Hood sides a re fastened to s ides of outdoo r air opening. Remove the hood sides and save the screws (3 each side).

3. Remove the bracket holding the bottom half of the hood in the shipping position. Remove the hood bottom half and filters (or manual dampers on units so equipped) from outdoor section.

NOTE: On units without economizers, the components are attached to the unit basepan. To access the components, remove the panel below the outdoor air intake section.

4. Remove inner filter track from shipping position in outdoor section. Position inner filter track so the

track is facing outward from the unit. Install the filter track with 4 screws provided.

5. Apply seal strip (provided) to back flange of both hood sides where hood side connec ts to the uni t bac k panel . See Fig. 18.

6. Apply seal strip (provided) to top flange of both hood sides where hood sid es connect to the hood top panels. See Fig. 18.

7. Install hood sides to the bac k pane ls using the screws from Step 2. The sloped flanges point outward. The drip edges of the side panels should face outward as well. Attach the filter guides to the hood sides. The flanges of the filter guides should face inward to hold the filters in place. See Fi g. 18.

8. Apply seal strip along the enti re lengt h of the bottom flange of the hood top. See Fig. 18.

9. Install the bottom part of the hood top using 4 screws provided. See Fi g. 18.

10. Remove the packaging from filters (3) and install into the filter tracks. Slide the filters to the sides then place the last filter into the center of the f ilter track.

NOTE: For units with manual dampers, replace the end filters with the manual dampers. Install the filter in the center bet w een the manual da mpers.

11. Insta ll the fil ter re ta iner track al ong th e bo ttom ed ge of the outdoor air ho od using 4 screws prov ided. See Fig. 18.

12. Install top section of the outdoor air hood using 9 screws provided. See Fig. 18. See Fig. 19 for a picture of the assembled outdoor air hood.

NOTE: For filter removal, remo ve the fou r scre ws ho ldin g th e filter retainer. The filters can then be rem oved, cleaned, or replaced. Install th e filters by reversing the procedure.

A. Manual Damper Assembly

For units equipped with manual dampers, the assembly process is similar to the outdoo r air hood for units with econ omizers. The r e ar e tw o slide dampers shi pp ed w it h t h e unit to allow for manual setting of the outside air volume. When assembling th e h ood, plac e on e of the manu al sl ide d amp ers in each of the end positions and the remaining filter in the center position. The manual dampers can then be moved to the appropriate position and then locked into place using the screws mounted in the adjustment slots. See Fig. 20.

HOOD TOP (TOP HALF)

HOOD SIDE

RETURN AIR SECTION

HOOD SIDE

HOOD TOP (BOTTOM HALF)

Fig. 17 — Outdoor-Air Hood Component

Shipping Location

—12—

Table 4A — Electrical Data — Units Without Convenience Outlet

NOMINAL

581A

VOLTAGE

UNIT SIZE

60 Hz)

208/230 187 253 16.7 130 16.7 130 22.4 184 4 0.25 1.5

210

208/230 187 253 22.4 184 22.4 184 22.4 184 4 0.25 1.5

240

208/230 187 253 47.1 245 47.1 245 — — 6 0.25 1.5

300

LEGEND

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

*Fuse or HACR circuit breaker.

NOTES:

1. In compliance with NEC requirements for multimotor and combination load equipment (refer to NEC Articles 430 and 440), the overcurrent protective device for the unit shall be fuse or HACR breaker. Canadian units may be fuse or circuit breaker.

2. Unbalanced 3-Phase Supply Voltage

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

Use the following formula to determine the percent voltage imbalance.

% Voltage Imbalance

= 100 x

VOLTAGE

(3 Ph,

RANGE

Min Max RLA LRA RLA LRA RLA LRA Qty Hp

460 414 506 9 70 9 70 10.7 90 4 0.25 0.7

575 518 633 7 55 7 55 9.3 73 4 0.25 0.7

460 414 506 10.7 90 10.7 90 10.7 90 4 0.25 0.7

575 518 633 9.3 73 9.3 73 9.3 73 4 0.25 0.7

460 414 506 19.6 125 19.6 125 — — 6 0.25 0.7

575 518 633 15.8 100 15.8 100 — — 6 0.25 0.7

max voltage deviation from average voltage

average voltage

COMPRESSOR

No. 1No. 2No. 3

OFM IFM

FLA

Hp FLA Qty Hp

(ea)

3.7 10.6/ 9.6

5 16.7/15.2

3.7 4.8

57.6

33.9

56.1

5 16.7/15.2

7.5 24.2/22

57.6

7.5 11

56.1

7.5 9

7.5 24.2/22

10 30.8/28

7.5 11

10 14

7.5 9

10 11

3. The convenience outlet full load amps (FLA) are 5, 3, and 3 for 208/230, 460,

POWER

EXHAUST

—— —

2 1 5.9 90/ 89 100/100 97/ 96

— — — 84/ 83 100/100 90/ 89

2 1 5.9 96/ 94 100/100 104/102

—— —

213.1 45 50 49

—— — 42 50 45

213.1 48 50 52

—— —

212.4 37 45 40

—— — 35 40 37

212.4 39 45 43

—— —

2 1 5.9 107/106 125/125 117/115

— — — 103/101 125/110 112/109

2 1 5.9 115/113 125/125 126/123

—— —

213.1 51 60 56

—— — 49 50 53

213.1 55 60 60

—— —

212.4 44 50 48

—— — 42 50 46

212.4 47 50 51

—— —

2 1 5.9 151/149 175/175 160/158

— — — 146/143 175/175 154/151

2 1 5.9 158/155 200/200 168/164

—— —

213.1 66 80 70

—— — 62 80 66

213.1 69 80 73

—— —

212.4 54 60 57

—— — 51 60 54

212.4 56 60 59

EXAMPLE: Supply voltage is 460-3-60.

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 voltage imbalance.

% Voltage Imbalance = 100 x

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 the local electric utility company immediately.

575-V units, respectively.

COMBUSTION

FAN MOTOR

FLA (ea)

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

Average Voltage =

FLA MCA MOCP* FLA

0.5

0.3

0.24

0.5

0.3

0.24

0.5

0.3

0.24

= 1.53%

457

POWER SUPPLY

78/ 77 100/ 90 83/ 82

39 45 42

32 40 35

96/ 94 100/100 103/102

45 50 49

39 45 42

139/137 175/175 147/144

59 60 63

49 60 52

452 + 464 + 455

1371

=457

DISCONNECT

SIZE

—13—

Table 4B — Electrical Data — Units With Optional Convenience Outlet

NOMINAL

581A

VOLTAGE

UNIT

SIZE

60 Hz)

208/230 187 253 16.7 130 16.7 130 22.4 184 4 0.25 1.5

210

208/230 187 253 22.4 184 22.4 184 22.4 184 4 0.25 1.5

240

208/230 187 253 47.1 245 47.1 245 — — 6 0.25 1.5

300

LEGEND

*Fuse or HACR circuit breaker.

NOTES:

2. Unbalanced 3-Phase Supply Voltage

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

% Voltage Imbalance

= 100 x

VO LTAGE

(3 Ph,

Use the following formula to determine the percent voltage imbalance.

RANGE

Min Max RLA LRA RLA LRA RLA LRA Qty Hp

460 414 506 9 70 9 70 10.7 90 4 0.25 0.7

575 518 633 7 55 7 55 9.3 73 4 0.25 0.7

460 414 506 10.7 90 10.7 90 10.7 90 4 0.25 0.7

575 518 633 9.3 73 9.3 73 9.3 73 4 0.25 0.7

460 414 506 19.6 125 19.6 125 — — 6 0.25 0.7

575 518 633 15.8 100 15.8 100 — — 6 0.25 0.7

max voltage deviation from average voltage

average voltage

COMPRESSOR

No. 1No. 2No. 3

OFM IFM

FLA

Hp FLA Qty Hp

(ea)

3.7 10.6/ 9.6

5 16.7/15.2

3.7 4.8

57.6

33.9

56.1

5 16.7/15.2

7.5 24.2/22

57.6

7.5 11

56.1

7.5 9

7.5 24.2/22

10 30.8/28

7.5 11

10 14

7.5 9

10 11

3. The convenience outlet full load amps (FLA) are 5, 3, and 3 for 208/230, 460,

POWER

EXHAUST

—— —

2 1 5.9 95/ 94 100/100 103/101

— — — 89/ 88 100/100 96/ 94

2 1 5.9 101/ 99 110/100 110/108

—— —

213.1 48 50 52

—— — 45 50 48

213.1 51 60 56

—— —

212.4 40 45 43

—— — 38 45 40

212.4 42 50 46

—— —

2 1 5.9 112/111 125/125 123/121

— — — 108/106 125/125 118/115

2 1 5.9 120/118 125/125 131/129

—— —

213.1 54 60 59

—— — 52 60 56

213.1 58 60 63

—— —

212.4 47 50 51

—— — 45 50 49

212.4 50 50 55

—— —

2 1 5.9 156/154 200/200 166/163

— — — 151/148 175/175 160/157

2 1 5.9 163/160 200/200 173/170

—— —

213.1 69 80 73

—— — 65 80 69

213.1 72 90 77

—— —

212.4 57 60 60

—— — 54 60 57

212.4 59 60 63

EXAMPLE: Supply voltage is 460-3-60.

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 voltage imbalance.

% Voltage Imbalance = 100 x

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 the local electric utility company immediately.

575-V units, respectively.

COMBUSTION

FAN MOTOR

FLA (ea)

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

Average Voltage =

FLA MCA MOCP* FLA

0.5

0.3

0.24

0.5

0.3

0.24

0.5

0.3

0.24

= 1.53%

457

POWER SUPPLY

83/ 82 100/100 89/ 88

42 50 45

35 40 38

101/ 99 110/100 109/107

48 50 52

42 50 46

144/142 175/175 152/150

62 80 66

52 60 55

452 + 464 + 455

1371

=457

DISCONNECT

SIZE

—14—

SEAL STRIP LOCATION

BOTTOM HOOD SECTION

TOP HOOD SECTION

FILTER RETAINER

FILTER GUIDE

HOOD SIDE

FILTER

ADD SEAL STRIP

INNER FILTER TRACK

FILTER GUIDE

ADD SEAL STRIP

MANUAL DAMPER (IF EQUIPPED)

NOTE: Units with manual damper only use one filter.

Fig. 18 — Outdoor-Air Hood Details

MOVEABLE DAMPER

AIR FILTER POSITION

Fig. 20 — Manual Damper Details

HOOD SIDE

UNIT BACK PANEL

LOCKING SCREW

MOVEABLE DAMPER

Fig. 19 — Outdoor-Air Hood Assembled

—15—

XI. STEP 11 — POSITION OPTIONAL POWER EXHAUST OR BAROMETRIC RELIEF DAMPER HOOD

The optional p o we r exhaust or barometric re lief dampers are shipped assembled and tilted back into the unit for shipping. Brackets and extra screws are shipped in shrink wrap around the dampers.

1. Remove 9 screws holding each damper assembly in place. See Fig. 21. Each damper assembly is secured with 3 screws on each side and 3 screws along the bottom. Save screws.

CAUTION: Be careful when tilting blower assembly. Hoods and bl ow ers ar e heav y and ca n ca use i nj ur y if dropped.

2. Pivot the damper assembly outward until top edge of the damper assembly rests against the inside wall of unit.

3. Secure each damper assembly to unit with 6 screws across top (3 screws provided) and bottom (3 screws from Step 1) of damper.

4. With screws saved from Step 1, install brackets on each side of damper assembly. See Fig. 22.

5. Remove tape from damper blades.

XII. STEP 12 — NON-FUSED DISCONNECT

The handle for the factory-installed non-fused disconnect is shipped inside the unit to prevent the handle from being damaged during shipping. Follow these steps to complete installation of the handle.

WARNING: Be sure power is shut off to the unit

from the building power supply.

1. Open the control box access door.

2. Remove the small cover plate located on the unit corner post near the control s ection.

3. Remove the inner con trol box cover. The handle and shaft are located in a plastic bag at the bottom of the control box.

4. Insert the square shaft i nto the disconnect with the pins vertical. On the 100-amp disconnect, the shaft is keyed into the disconnect and can only be installed one way (with the pins vertical).

5. Insert the handle through the corner post and onto the shaft with the handle positioned so that “OFF” is on top.

Fig. 22 — Bracket and Hood Positioning

6. Rotate the handle to the “ON” position to lock the pins into the handle.

7. From the inside of the co rner post, a ttach the hand le mounting screws to the handle. Slide the shaft fully into the handle and tighten the set screw(s) on the disconnect to lock the shaft. Tighten the screws that attach the handle to the corner post.

8. Rotate the handle back to the “OFF” position.

9. Replace all panels and doors. Power can now be turned back on to the unit.

XIII. STEP 13 — INSTALL ALL ACCESSORIES

After all of the factory- installed options have been a djusted, install all field-instal led accessories. Refer to the accessory installation ins tructions included with each acce ssory. Consult the Bryant Price Pages for accessory package numbers for particular applications.

Fig. 21 — Power Exhaust or Barometric Relief Damper Mounting Details

—16—

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 the se rvicing refrigerant system.

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

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

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

5. Never attempt to repair a sol dered connection while the refrigerant system is under pressure.

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

a. Shut off gas and then electrical power to

the unit. Install lockout tag.

b. Relieve all pressure from the system using

both high-pressure and low-pressure ports.

c. Cut the component connection tubing with

a tubing cutter, and remove the component from the unit.

d. Carefully unsweat the remaining tubing

stubs when necessar y. Oil can igni te 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, the unit.

3. Make the following inspections:

a. Inspect for shipping and handling damages such

as broken lines, loose parts, or disconnected wires, etc.

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 an 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 the fins with a fin comb.

4. Verify the following conditions:

a. Make sure that condenser fan blade is correctly

positioned in the fan orifice. See Condenser-Fan Adjustment section on page 39 for more details.

b. Make sure that air filter(s) is 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.

START-UP

Use the following information and Start-Up Checklist on page CL-1 to check out unit PRIOR to start-up.

I. UNIT PREPARATION

Check that unit has been installed in accordance with these installation instructions and all applicable codes.

II. COMPRESSOR MOUNTING

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

III. REFRIGERANT SERVICE PORTS

Each independent refrigerant system has a total of 3 Schrader-type service gage ports per circuit. One port is located on the s uction l ine, one on the comp ressor discharge line, and one on the liquid line. Be sure that caps on the ports are tight.

IV. CRANKCASE HEATER(S)

Crankcase heaters are energized as long as there is power to the unit and the compressor is not operating.

IMPORTANT: Unit power must be on for 24 hours prior to start-up. Otherwise, damage to compressor may result.

V. COMPRESSOR PHASING

WARNING: Improper wiring will cause compres-

sor stoppage and may cause equipment damage. Correct wiring by switching leads as indicated below.

On 3-phase units, it i s important to be certain the compressors are rotating in the proper direction. To determine whether or not compr essors are ro tating i n the pro per di rection, use a phase-rotation meter on the unit input power to check for L1-L2-L3 or clockwise rotation. If the compressor is rotating in the wrong direction, the suction pressure will not drop and the discharge pressure will not rise.

NOTE: Indoor or outdoor fan rotation direction may not indicate proper input power phase sequence, as some 3-phase units use single-phase fan motors. Check fan rotation where applicable.

To correct the wrong compressor rotation dir ection, perform the following procedure:

1. Turn off power to the unit and lock out the power.

2. Switch any two of the incoming unit power leads.

3. Turn on power to the unit.

4. Verify corrected compressor rotation a nd fan rota ti on where applicable.

VI. INTERNAL WIRING

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

VII. EVAPORATOR FAN

Fan belt and variable pulleys are factory-installed. See Tables 5-23 for fan performance data. Be sure that fans rotate in the proper direction. See Table 24 for air quantity limits. See Table 25 for evaporator fan motor specifications. See Table 26 for accessory or factory-installed options static pressure. See Table 27 for fan rpm at various motor pulle y settings. To alter fan performanc e, see Evaporator Fan Performance Adjustment section on page 39.

—17—

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