Bryant 548D User Manual

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installation, start-up and service instructions

SINGLE PACKAGE ROOFTOP STANDARD-EFFICIENCY HEAT PUMP UNITS

Cancels: II 548D-90-1 II 548D-90-2

548D

Sizes 090-120

71/2 to 10 Tons

10/15/00

CONTENTS

Page

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

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-27

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

II. Step 2 — Field Fabricate Ductwork . . . . . . . . . . . . . 3

III. Step 3 — Install Condensate Drain Line

and External Trap. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

IV. Step 4 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . 3

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

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

VII. Step 7 — Adjust Indoor-Fan Speed . . . . . . . . . . . . 19

PRE-START-UP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28-30

I. Unit Preparation. . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

II. Return-Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

III. Outdoor-Air Inlet Screen . . . . . . . . . . . . . . . . . . . . . 28

IV. Compressor Mounting. . . . . . . . . . . . . . . . . . . . . . . 28

V. Internal Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

VI. Refrigerant Service Ports . . . . . . . . . . . . . . . . . . . . 28

VII. High Flow Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

VIII. Compressor Rotation . . . . . . . . . . . . . . . . . . . . . . . 28

IX. Adjust Gas Input . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

X. Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

XI. Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

XII. Safety Relief . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

XIII. Ventilation (Continuous Fan) . . . . . . . . . . . . . . . . . 29

XIV. Operating Sequence . . . . . . . . . . . . . . . . . . . . . . . . 29

SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30-33

I. Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

II. Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

III. Outdoor Fan Adjustment. . . . . . . . . . . . . . . . . . . . . 32

IV. Economizer Adjustment . . . . . . . . . . . . . . . . . . . . . 32

V. Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . 32

TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . .34-38

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, rep air, or service air-conditioning equipment.

Untrained personnel can perform basic maintenance functions of cleaning coils and filters and replacing filters. All other operations s hou l d b e pe rform ed by train ed se rvic e p ersonnel. 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 o perations. Have fire extinguisher available for all brazing operations.

WARNING: Before performing service or maintenance operations on unit, turn off main power switch to unit and tag disconnect with 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 scre ws, install covers on vertical du ct openings with the insulation-side down. Seals around duct openings must be tight.

I. STEP 1 — PROVIDE UNIT SUPPORT

A. Roof Curb

Assemble and install access ory roof curb in accorda nce with instructions shipped with curb. See Fig. 1. Install in su lation, cant strips, roofing felt, and counte r flashing as sho wn. Duct- work must be attached to curb. If electric or cont rol power is to be routed through the basepan, attach the accessory thruthe-bottom service conn ections to the basepa n in acco rdance 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 watertightness. Install gasket supplied with the roof curb as shown in Fig. 1. Improperly applied gask et can also result in air leaks and poor unit performance.

Curb should be level. Unit leveling tolerances are shown in Fig. 2. This is necessary for unit drain to function properly. Refer to Accessory Roof Curb Installation Instructions for additional information as required.

B. Slab Mount (Horizontal Units Only)

Provide a level concrete slab that exte nds a m ini mum o f 6 i n. beyond unit cabinet. Install a 6 in. 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.

CAUTION: Ensure voltage listed on unit data plate agrees with electrical supply provided for the unit.

ROOF CURB

ACCESSORY CRRFCURB003A00 CRRFCURB004A00

“A”

1′-2″ [356] 2′-0″ [610]

UNIT SIZE

548D

090-150

“B” “C”

″

2′-8

[827]

1′-10

“D” ALT

DRAIN

HOLE

[583]

NOTES:

1. Roof curb accessor y is shipped unassembled.

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

3. Dimensions in [ ] are in millimeters.

4. Roof curb: 16 gage steel.

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

″

[44.5]

/4 lb density.

“E”

GAS

″

[19] NPT

″

[12.7] NPT

″

[19] NPT

“F”

POWER

″

[19] NPT

″

[31.7] NPT CRBTMPWR002A00

″

[19] NPT

″

[31.7] NPT CRBTMPWR004A00

“G”

CONTROL

″

[12.7]

NPT

″

[12.7]

NPT

CONNECTOR

PACKAGE

ACCESSORY

CRBTMPWR001A00

CRBTMPWR003A00

6. Service clearance 4 ft on each side.

7. Direction of airflow.

8. Connector packages CRBTMPWR001A00 and 002A00 are for thru-the-curb connections. Packages CRBTMP003A00 and 004A00 are for thru-the-bottom connections.

PLACE UNIT AS CLOSE TO

THIS END OF CURB AS POSSIBLE

Fig. 1 — Roof Curb Details

—2—

MAXIMUM ALLOWABLE

DRAIN PLUG

DIFFERENCE (in.)

A-B B-C A-C

0.5 1.0 1.0

Fig. 2 — Unit Leveling Tolerances

II. STEP 2 — FIELD FABRICATE DUCTWORK

On vertical discharge un its, secure a ll duct s to roo f curb an d building structure. Do not connect ductwork to unit. For hori- zontal applications, fiel d-suppl ied fl anges sh ou ld be a ttach ed to horizontal discharge openin gs 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 unc ondit i one d spa ce 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 r oof deck to comply with applicable fire codes.

A minimum clearance to combustibles is not required around ductwork on vertical discharge units. On horizontal discharge units with electric heat, a minimum clearance of 1 in. is required for the first 12 in. of ductwork. Cabinet return-air static should no t exceed –0.35 in. wg with Du rablade econ omizer, –0.30 in. wg with EconoMi$er, or –0.45 in. wg without economizer.

Lifting holes are provided in base rails as shown in Fig. 5 and 6. Refer to rigging instructions on unit.

Positioning

Maintain clearance around and above unit to provide proper airflow and service access. See Fig. 6.

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

/4-in. clearance bet ween roof c urb and bas e rails on each side and in duct end of unit; 35/16-in. clearanc e between roof curb and condenser end (see Fig. 1, section C-C).

Do not install unit in an indoor location. Do not locate unit air inlet near exhaust vents or other sources of contaminated 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.

CAUTION: Ensure voltage listed on unit data plate agrees with electrical supply provided for the unit.

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

Condensate drain connections are located on the botto m 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 factory-installed plug (Red) from the bottom connection to the end connection. See Fig. 3. The piping for the condensate drain and external trap can be compl eted after the unit is in place.

All units must have an external trap for condensate drainage. Install a trap at least 4-in. deep and protect against freeze-up. See Fig. 4. 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.).

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 f rame as a reference. See Table 1 and Fig. 5 for additional information. Operating weight is shown in Table 1 and Fig. 5.

NOTE:

Drain plug is shown in factory-installed position.

Fig. 3 — Condensate Drain Connection

NOTE:

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

ference. A 4-in. trap is recommended.

Fig. 4 — External Trap Condensate Drain

—3—

NOTES:

1. Dimension in ( ) is in millimeters.

2. 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.

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

UNIT 548D

090 102 120

MAX

WEIGHT

lb kg in. mm in. mm in. mm

940 426 77.42 1966.5 41.5 1054 42.12 1070 965 438 77.42 1966.5 41.5 1054 42.12 1070

1015 460 77.42 1966.5 41.5 1054 42.12 1070

‘‘A’’ ‘‘B’’ ‘‘C’’

DIMENSIONS

CAUTION:

lifting.

All panels must be in place when rigging and

Fig. 5 — Rigging Details

—4—

BOTTOM POWER CHART, THESE HOLES REQ’D

) OR

″

CRBTMPWR001A00 (

FOR USE WITH ACCESSORY PACKAGES —

)

″

, 1

″

CRBTMPWR002A00 (

[28.4]

[44.4]

[22.2]

″

(Max.)

USE

SIZE

924

1253 3-0

for power, depending on wire

″

24 V

Pow er* 1

or 1

″

″″

″

″″

″

FPT

″

″″

″

size.

*Select either

SIZES

REQ’D HOLE

WIRE

CONDUIT

THREADED

856

1050 2-9

“H” “J” “K”

(D)

WEIGHT

CORNER

(C)

WEIGHT

CORNER

(B)

WEIGHT

CORNER

(A)

WEIGHT

CORNER

WEIGHT

ECONOMI$ER

WEIGHT

DURABLADE

ECONOMI ZER

632 3-5

885 4-1

Fig. 6 — Base Unit Dimensions

Dia. [35] Field Power Supply Hole

Dia. [64] Power Supply Knockout

Dia. [44] Charging Port Hole

″

Dia. [22] Field Control Wiring Hole

CONNECTION SIZESA1

— 14 NPT Condensate Drain

″

Dia. [51] Power Supply Knockout

″

-0

′

[495] for 090 and 102, 2

″

-7

′

WEIGHT

STD UNIT

UNIT

548D

940 426 44 20 62 28 207 94 178 81 254 115 301 136 2- 0

965 438 44 20 62 28 212 96 183 83 261 119 309 140 2- 0

Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Ft-in. mm Ft-in. mm Ft-in. mm

1015 460 44 20 62 28 223 101 193 88 274 124 325 147 2-10

on horizontal discharge units with electric heat 1 in. clearance to

ductwork for 1 ft.

other. The side getting the greater clearance is optional.

cal Code).

per NEC.

surfaces, control box side, 42 in. per NEC.

e. Between unit and ungrounded surfaces, control box side, 36 in.

f. Between unit and block or concrete walls and other grounded

g. Horizontal supply and return end, 0 inches.

6. With the exception of the clearance for the condenser coil as stated

[610] for 120 up from the bottom of the base rail.

in Notes 5a, b, and c, a removable fence or barricade requires no

clearance.

Class A, B, or C roof covering material.

7. Units may be installed on combustible floors made from wood or

8. The ver tical cente r of gravity is 1

090

102

120

a. Bottom to combustible surfaces (when not using curb) 0 inches,

b. Condenser coil, for proper airflow, 36 in. one side, 12 in. the

c. Overhead, 60 in. to assure proper condenser fan operation.

1. Dimensions in [ ] are in millimeters.

2. Center of gravity.

3. Direction of airflow.

4. Ductwork to be attached to accessory roof curb only.

NOTES:

5. Minimum clearance (local codes or jurisdiction may prevail):

d. Between units, control box side, 42 in. per NEC (National Electri-

—5—

Table 1 — Physical Data

UNIT SIZE 548D 090 102 120 NOMINAL CAPACITY (tons) OPERATING WEIGHT (lb)

Unit

Al/Al*

Economizer

Durablade EconoMi$er

Roof Curb†

COMPRESSOR

Quantity Oil (oz)

REFRIGERANT TYPE

Operating Charge (lb-oz)

Circuit 1 Circuit 2

OUTDOOR COIL

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

OUTDOOR FAN

Nominal Cfm Quantity...Diameter (in.) Motor Hp...Rpm Watts Input (Total)

INDOOR COIL

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

INDOOR FAN

Quantity...Size (in.) Std

Type Drive Std

Nominal Cfm Maximum Continuous Bhp Std

Motor Frame Size Std

Nominal Rpm High/Low Std

Fan Rpm Range Std

Motor Bearing Type Maximum Allowable Rpm Motor Pulley Pitch Diameter Min/Max (in.) Std

Nominal Motor Shaft Diameter (in.) Std

Fan Pulley Pitch Diameter (in.) Std

Belt, Quantity...Type...Length (in.) Std

Pulley Center Line Distance (in.) Std

Speed Change per Full Turn of

Movable Pulley Flange (rp m) Std

Movable Pulley Maximum Full Turns

From Closed Position Std

Factory Setting Std

Factory Speed Setting (rpm) Std

Fan Shaft Diameter at Pulley (in.)

HIGH-PRESSURE SWITCH (psig)**

Standard Compressor Internal Relief (Differential) Cutout Reset (Auto.)

LOSS-OF-CHARGE SWITCH (psig)**

Cutout Reset (Auto.)

FREEZE-PROTECTION THERMOSTAT (F)**

Opens Closes

OUTDOOR-AIR INLET SCREENS

Quantity...Size (in.)

RETURN-AIR FILTERS

Quantity...Size (in.)

Alt

LEGEND

Al —

Aluminum

Bhp —

Brake Horsepower

*Indoor coil fin mater ial/outdoor coil fin material.

†Weight of 14-in. roof curb.

**Requires an accessory or optional controls upgrade kit.

Enhanced Copper Tubes, Aluminum Double-Wavy Fins, Acutrol Fixed Orifice Metering Feed Device

81/

940 965 1015

44 44 44 62 62 62

143 143 143

222

45 ea 62 ea 54 ea

Hermetic Scroll

R-22

5-14 8- 6 7-14 5-13 8-13 8- 3

Enhanced Copper Tubes, Aluminum Lanced Fins, Acutrol™ Feed Device

1...17 2...17 2...17

20.50 18.00 18.30

6500 6500 6500

2...22 2...22 2...22

/4...1100

600 600 600

3...15 3...15 3...15

8.0 8.0 11.1

1...15 x 15 1...15 x 15 1...15 x 15

1...15 x 15 — 1...15 x 15 Belt Belt Belt Belt — Belt

3000 3600 4000

2.40 2.40 2.40

——2.90

56 56 56

——56 ———

——— 590-840 685-935 685- 935 685-935 — 835-1085

Ball Ball Ball

2100 2100 2100

2.4/3.4 2.8/3.8 2.8/3.8

2.8/3.8 — 3.4/4.4

—

7.0 7.0 7.0

7.0 — 7.0

1...A...48 1...A...48 1...A...48

1...A...48 — 1...A...48

16.75-19.25 16.75-19.25 15.85-17.50

15.75-19.25 — 15.85-17.50

50 50 50 50 — 50

555 5—5 555

5—5 590 685 685 685 — 835

111

4...16 x 20 x 2 4...16 x 20 x 2 4...20 x 20 x 2

NOTE:

The 548D units have a loss-of-charge switch located in the liquid line avail-

able as an option or an accessory. (Standard on 120 units.)

Propeller Type

/4...1100

Centrifugal Type

—

450 ± 50

428 320

7 ± 3

22 ± 5

30 ± 5 45 ± 5

Cleanable

1...20 x 25 x 1

1...16 x 25 x 1 Throwaway

/4...1100

—6—

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 c o nsi st 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 Association) 70 latest 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 on the transformer and co nnecting it to the 200-v terminal from the transformer.

Refer to unit label diagram for additional information. Pigtails are provided for field wire connections. 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 re-

quirements. 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 thr ough side panel openin gs . For units without electric heat, install conduit between disconnect and control box.

2. Install power lines to terminal connections as shown in Fig. 7.

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

4. If thru-the-bottom control connections are used, refer to the accessory install ation ins tructions for information on control wiring. Refer to Fig. 6 for drilling holes in basepan.

During operation, vo ltage to compressor termina ls must be within range indicated on unit nameplate (see Tables 2A and 2B). On 3-phase units, voltages between phases must be balanced within 2%, and the current within 10%. Use the formula shown in Tables 2A and 2B, 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 warranty.

208/230-3-60

460-3-60

LEGEND

C— COMP — IFC — NEC — TB —

Contactor Compressor Indoor Fan Contactor National Electrical Code Terminal Block Field Wiring Factory Wiring Splice Connection (Factory-Supplied)

Fig. 7 — Power Wiring Connections

—7—

575-3-60

Table 2A — Electrical Data (Units Without Electrical Convenience Outlet)

VOLTAGE UNIT 548D

NOMINAL

V-PH -H z

TYPE

RANGE

IFM

Min Max RLA LRA

208/230-3-60 STD 187 254 13.4 91.0 1.4 5.8

090

/2 Tons)

460-3-60 STD 414 508 6.7 42.0 0.7 2.6

575-3-60 STD 518 632 5.4 39.0 0.7 2.6

208/230-3-60 STD 187 254 16.0 137.0 1.4 5.8

102

/2 Tons)

460-3-60 STD 414 508 8.3 69.0 0.7 2.6

575-3-60 STD 518 632 6.4 58.0 0.7 2.6

STD 187 254 17.2 124.0 1.4 5.8

208/230-3-60

ALT 187 254 17.2 124.0 1.4 7.5

120

STD 414 508 8.6 59.6 0.7 2.6

(10 Tons)

460-3-60

ALT 414 508 8.6 59.6 0.7 3.4

STD 518 632 6.9 49.4 0.7 2.6

575-3-60

ALT 518 632 6.9 49.4 0.7 3.4

NOTE:

Legend and Notes for Electrical Data are on page 10.

COMPRESSOR

(each)

OFM FLA

ELECTRIC HEAT* POWER SUPPLY

IFM FLA

Nominal

kW**

FLA MCA MOCP FLA LRA

DISCONNECT

— — 38.8/ 38.8 40/ 40†† 41/ 41 229/229

7.8/10.4 21.7/ 25.0 65.9/ 70.0 70/ 80 66/ 69 251/254

12.0/16.0 33.3/ 38.5 80.4/ 86.9 90/ 90 79/ 85 262/268ll

18.6/24.0 50.0/ 57.7 103.3/113.4 110/125 100/109 281/289ll

24.0/32.0 66.6/ 77.0 122.0/135.0 125/150 117/129 296/306ll

31.8/42.4 88.3/102.0 149.1/166.3 150/175 142/158 317/331ll — — 19.1 20†† 20 108

13.9 16.7 40.0 45†† 39 124

16.5 19.8 43.8 45†† 43 128

27.8 33.4 60.8 70 58 141

33.0 39.7 68.7 70 66 147

41.7 50.2 81.8 90 78 158 — — 15.4 20†† 16 97

17.0 17.1 36.7 40†† 36 114

34.0 34.1 68.0 60†† 55 131 — — 44.6/ 44.6 45/ 45†† 47/ 47 321/321

7.8/10.4 21.7/ 25.0 71.7/ 75.9 80/ 80 72/ 75 343/346

12.0/16.0 33.3/ 38.5 86.2/ 92.7 90/100 85/ 91 354/360II

18.6/24.0 50.0/ 57.7 109.1/119.2 110/125 106/115 373/381II

24.0/32.0 66.6/ 77.0 127.9/140.9 150/150 123/135 388/398II

31.8/42.4 88.3/102.0 155.0/172.0 175/175 148/164 409/423II — — 22.7 25†† 24 162

13.9 16.7 43.6 45†† 43 178

16.5 19.8 47.4 50†† 46 182

27.8 33.4 64.4 70 62 195

33.0 39.7 72.3 80 69 201

41.7 50.2 85.4 90 81 212II — — 17.3 20†† 18 135

17.0 17.1 39.0 40†† 38 152

34.0 34.1 60.2 60†† 58 169 — — 47.3/ 47.3 50/ 50†† 49/ 49 295/295

7.8/10.4 21.7/ 25.0 74.4/ 78.6 80/ 80 74/ 78 317/320

12.0/16.0 33.3/ 38.5 88.9/ 95.4 90/100 88/ 94 328/334ll

24.0/32.0 66.6/ 77.0 130.6/143.6 150/150 126/138 362/372ll

31.8/42.4 88.3/102.0 157.7/174.8 175/175 151/167 383/397ll

37.6/50.0 104.4/120.3 177.8/167.6 200/175 170/188 399/415ll — — 49.0/ 49.0 50/ 50†† 51/ 51 314/314

7.8/10.4 21.7/ 25.0 76.1/ 80.8 80/ 90 76/ 80 336/389ll

12.0/16.0 33.3/ 38.5 90.6/ 97.1 100/100 90/ 96 347/353ll

24.0/32.0 66.6/ 77.0 132.3/145.3 150/150 128/140 381/391ll

31.8/42.4 88.3/102.0 159.4/176.5 175/200 153/169 402/416ll

37.6/50.0 104.4/120.3 179.5/169.3 200/175 171/190 418/434ll — — 23.4 25†† 24 143

16.5 19.8 48.1 50†† 47 163

27.8 33.4 65.1 70 63 176

33.0 39.7 73.0 80 70 183

41.7 50.2 86.1 90 82 193ll

50.0 60.1 83.5 90 93 203ll — — 24.2 25†† 25 182

16.5 19.8 48.9 50†† 48 202

27.8 33.4 65.9 70 64 216

33.0 39.7 73.8 80 71 222

41.7 50.2 86.9 90 83 233ll

50.0 60.1 84.3 90 94 243ll — — 18.7 20†† 20 118

17.0 17.1 40.1 50†† 39 135

34.0 34.1 61.4 70 59 152

51.0 51.2 69.9 70 78 159 — — 19.4 20†† 20 149

17.0 17.1 40.7 50†† 40 166

34.0 34.1 62.0 70 60 183

51.0 51.2 70.6 80 79 201

SIZE†

—8—

Table 2B — Electrical Data (Units With Electrical Convenience Outlet)

VOLTAGE

UNIT 548D

NOMINAL

V- PH -H z

RANGE

IFM

TYPE

Min Max RLA LRA

208/230-3-60 STD 187 254 13.4 91.0 1.4 5.8

090

/2 Tons)

460-3-60 STD 414 508 6.7 42.0 0.7 2.6

575-3-60

STD 518 632 5.4 39.0 0.7 2.6

208/230-3-60 STD 187 254 14.4 103.0 1.4 5.8

102

/2 Tons)

460-3-60 STD 414 508 7.2 52.5 0.7 2.6

575-3-60 STD 518 632 6.0 44.0 0.7 2.6

STD 187 254 17.2 124.0 1.4 5.8

208/230-3-60

ALT 187 254 17.2 124.0 1.4 7.5

120

STD 414 508 8.6 59.6 0.7 2.6

(10 Tons)

460-3-60

ALT 414 508 8.6 59.6 0.7 3.4

STD 518 632 6.9 49.4 0.7 2.6

575-3-60

ALT 518 632 6.9 49.4 0.7 3.4

NOTE:

Legend and Notes for Electrical Data are on page 10.

COMPRESSOR

(each)

OFM FLA

ELECTRIC HEAT* POWER SUPPLY

IFM

FLA

Nominal

kW**

FLA MCA MOCP FLA LRA

DISCONNECT

— — 43.6/ 43.6 45/ 45†† 46/ 46 234/234

7.8/10.4 21.7/ 25.0 70.7/ 74.8 80/ 80 71/ 75 256/259

12.0/16.0 33.3/ 38.5 85.2/ 91.7 90/100 85/ 91 267/272ll

18.6/24.0 51.6/ 59.7 108.1/118.2 110/125 106/115 285/294ll

24.0/32.0 66.6/ 77.0 126.8/139.8 150/150 123/135 300/311ll

31.8/42.4 88.3/102.0 153.9/171.1 175/175 148/164 322/336ll — — 21.3 25†† 23 110

13.9 16.7 42.1 45†† 42 127

16.5 19.8 46.0 50†† 45 130

27.8 33.4 63.0 70 61 143

33.0 39.7 70.9 80 68 150

41.7 50.2 84.0 90 80 160ll — — 17.1 20†† 18 99

17.0 17.1 38.5 40†† 38 116

34.0 34.1 59.7 60†† 57 133 — — 49.4/ 49.4 50/ 50†† 52/ 52 326/326

7.8/10.4 21.7/ 25.0 76.5/ 80.7 80/ 90 77/ 81 348/351ll

12.0/16.0 33.3/ 38.5 91.0/ 97.5 100/100 91/ 96 359/364ll

18.6/24.0 51.6/ 59.7 113.9/124.0 125/125 112/121 377/386ll

24.0/32.0 66.6/ 77.0 132.7/145.7 150/150 129/141 392/403ll

31.8/42.4 88.3/102.0 159.8/176.9 175/200 154/170 414/428ll — — 24.9 25†† 26 164

13.9 16.7 45.7 50†† 45 181

16.5 19.8 49.6 50†† 49 184

27.8 33.4 66.6 70 65 197

33.0 39.7 74.5 80 72 204

41.7 50.2 187.6 90 84 214ll — — 19.3 20†† 20 137

17.0 17.1 40.7 45†† 40 154

34.0 34.1 62.0 70 60 171 — — 52.1/ 52.1 60/ 60†† 55/ 55 300/300

7.8/10.4 21.7/ 25.0 79.2/ 83.4 80/ 90 80/ 84 322/325ll

12.0/16.0 33.3/ 38.5 93.7/100.2 100/110 93/ 99 333/338ll

24.0/32.0 66.6/ 77.0 135.4/148.4 150/150 132/144 366/377ll

31.8/42.4 88.3/102.0 162.5/179.6 175/200 157/172 388/402ll

37.6/50.0 104.4/120.3 182.6/172.4 200/200 175/193 404/420ll — — 53.8/ 53.8 60/ 60†† 57/ 57 319/319

7.8/10.4 21.7/ 25.0 80.9/ 85.1 90/ 90 82/ 86 341/344ll

12.0/16.0 33.3/ 38.5 95.4/101.9 100/110 93/101 352/357ll

24.0/32.0 66.6/ 77.0 137.1/150.1 150/175 134/145 385/396ll

31.8/42.4 88.3/102.0 164.2/181.3 175/200 158/174 407/421ll

37.6/50.0 104.4/120.3 184.3/174.1 200/200 177/195 423/439ll — — 25.5 30†† 27 145

16.5 19.8 50.3 60†† 50 165

27.8 33.4 67.3 80 65 178

33.0 39.7 75.2 80 73 185

41.7 50.2 88.3 90 85 195ll

50.0 60.1 85.6 90 96 205ll — — 26.3 30†† 28 185

16.5 19.8 51.1 60†† 51 204

27.8 33.4 68.1 70 66 218

33.0 39.7 76.0 80 73 224

41.7 50.2 89.1 90 85 235ll

50.0 60.1 86.4 90 97 245ll — — 20.5 20†† 22 120

17.0 17.1 41.8 45†† 41 137

34.0 34.1 63.1 70 61 154

51.0 51.2 71.7 80 80 171ll — — 21.1 20†† 22 151

17.0 17.1 42.5 45†† 42 168

34.0 34.1 63.7 70 62 185

51.0 51.2 72.3 80 81 202ll

SIZE†

—9—

LEGEND AND NOTES FOR TABLES 2A AND 2B

LEGEND

FLA — HACR — IFM — LRA — MCA — MOCP — NEC — OFM — RLA —

*Heaters are field installed only.

†Used to determine minimum disconnect per NEC.

**Heater capacity (kW) is based on heater voltage of 208 v, 240 v, or 480 v and

575 v. If power distribution voltage to unit varies from rated heater voltage, heater kW will vary accordingly.

††Fuse or HACR circuit breaker.

Optional disconnect switch is unavailable. (Applies to units with an FLA greater

or equal to 80.)

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.

Unbalanced 3-Phase Supply Voltage

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

imbalance.

Full Load Amps Heating, Air Conditioning and Refrigeration Indoor-Fan Motor Locked Rotor Amps Minimum Circuit Amps Maximum Overcurrent Protection National Electrical Code Outdoor-Fan Motor Rated Load Amps

Use the following formula to determine the percentage of voltage

% Voltage Imbalance

= 100 x

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 of voltage imbalance.

% Voltage Imbalance = 100 x

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

IMPORTANT:

tact your local electric utility company immediately.

max voltage deviation from average voltage

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

= 457

If the supply voltage phase imbalance is more than 2%, con-

average voltage

Average Voltage =

457

= 1.53%

452 + 464 + 455

1371

—10—

COMPRESSOR NO. 2

DISCONNECT BOARD

DISCONNECT SWITCH (OPTIONAL)

RACEWAY

HOLE IN END PANEL

COMPRESSOR NO. 1

B. Field Control Wiring

Install an approved ac cessory 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 subb ase term inals to low-voltage conne ctions on unit (shown in Fig. 8) as described in Steps 1 through 4 below.

NOTE: If using Bryant electronic thermostat, set thermostat configuration f or “non-hea t pump opera tion.” The use of the O terminal is not required to energize the reversing valve in this family of products.

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 dire ctly c onn ected to the thermostat and will require a junction box and splice at the thermostat.

1. If unit is mounted on roof cu rb and accessory thruthe-curb service plate connection is used, route wire through connection plate.

2. Pass control wires through the hole provided on unit (see connection D in Connection Sizes table in Fig. 6).

3. 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 clearance between the high- and low-voltage wiring.

4. Connect thermostat wires to s crew terminals of lo wvoltage connector (see Fig. 8).

NOTE: I f thru-the-bottom po wer connections are u sed refer to the accessory installation instructions for information on power wiring. Refer to Fig. 6 for drilling holes in basepan.

C. Defrost Board

The defrost board timer cycle is set to 30 minutes. To change the cycle time, remove the wire from defrost board connected to the 30-minute quick-connect. See Fig. 10. Connect the wire to the 50 or 90 minute quick-connects on the defrost board, depending on the desired defrost time.

D. Heat Anticipator Settings

For units with electric heat, set heat anticipator settings as shown in Table 3.

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. (See Fig. 9.)

B. Optional Durablade Economizer

The optional economizer hood assembly is packaged and shipped in the filter section. Damper blades and control boards are installed at the factory and the economizer is shipped in the vertical discharge position.

NOTE: Horizontal discharge block-off plate is shipped with the air hood package. If u nit is to be used for vertical discharge application, discard this plate.

Assembly

1. Determine if ventilation air is required in building. If so, determine the minimum amount to be supplied by

each unit and record quantity of ventilation air needed for use in Step 8.

2. Remove filter access panel by raising panel and swinging panel outward. Panel is now disengaged from track and can be removed. No tools are required to remove filter access panel. Remove outdoor-air opening panel. Save panels and screws. See Fig. 11. Remove optional outdoor-air damper hood package from filter section.

3. Assemble outdoor-air hood top and side plates as shown in Fig. 12. Install seal strips on hoop top and sides. Put aside screen retainer and retainer screw for later assembly. Do not attach hood to u nit at this

time.

LEGEND

AHA — CC —

Adjustable Heat Anticipator Cooling Compensator Field Wiring Factory Wiring

Fig. 8 — Low-Voltage Connections

Fig. 9 — Typical Field Control Wiring Raceway

—11—

Table 3 — Heat Anticipator Settings

208/230 460 575

UNIT

548D

*Heater capacity (kW) is based on heater voltage of 208 v, 240 v,

480 v and 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

24.8, 32.0 0.6 0.3 0.3

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

1-Stage

Configuration

2-Stage

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

Heater

kW*

13.9, 16.5

27.8, 33.0

Fig. 10 — Defrost Board

UNIT VOLTAGE

Configuration

1-Stage

0.3 NA NA 17.0, 34.0 0.3 NA NA

2-Stage

Heater

kW*

1-Stage

Configuration

2-Stage

Adjust minimum position setting by loosening the screws on the position setting bracket. See Fig. 18. Slide bracket until the top screw is in the position determined by Fig. 17. Tighten screws.

9. Remove tape and shipping screw from outdoor-air thermostat (OAT). Fas-ten OAT to inside of hood using screws and speed clips provided. See Fig. 19. Make sure OAT terminals are positioned up.

10. Repl ace outdoor-air opening p anel using scr ews from Step 2. Replac e filter access panel. Ensure t he filter access panel slides along the tracks and is securely engaged.

11. Fasten hood top and side plate assembly to outdoorair opening panel with screws provided.

12. Place knob supplied with economizer on OAT. See Fig. 19. Set for 3° F below indoor room thermostat setting. If accessory enthalpy control (EC) i s used in place of OAT, see instructions shipped with EC for installation and adjustment . See F ig. 19.

13. Connect OAT per Fig. 20.

14. Slide outdoor-air inlet screen into screen track on hood side plate. While holding screen in place, fasten screen retainer to hood usi ng screws provided.

NOTE: Refer to Fig. 21 for economizer barometric relief damper characteristics.

4. On size 120 units, install vertical discharge block-off plate over duct openings. See Fig. 13.

5. Economizer is factory-installed in unit and secured with screws. See Fig. 14.

NOTE: Be sure rear economizer flange is engaged under tabs in vertical return-air ope ni ng.

6. To convert to horizontal discharge application:

a. Rotate the economizer 90 d egrees unti l the econ-

omizer motor faces the outdoor section (see Fig. 15).

b. Remove shipping screw and tape from baromet-

ric damper and rotate the barometric relief damper hinge 90 degrees. Barometric relief damper should open vertically to operate properly.

c. Install horizontal discharge block-off plate over

the opening on the acce ss panel. (Block-off plate MUST be installed before installing hood assembly.) See Fig . 16.

7. Remove existing 12-pin blue and yellow wire jumper plug and store. Insert 12-pin economizer plug into economizer harness. See Fig. 14.

8. If ventilation air is not req uired , proce ed to Step 9. If ventilation air is required, determine the minimum position setting for required airflow. See Fig. 17.

Fig. 11 — Panel Locations

—12—

SHIPPING SCREW

BLOCK-OFF PLATE

Fig. 12 — Outdoor-Air Hood Details

SHIPPING SCREW

Fig. 14 — Durablade Economizer Installation

Fig. 13 — Vertical Discharge Block-Off Plate

(Size 120 Only)

Fig. 15 — Horizontal Discharge Durablade

Economizer Installation

Fig. 16 — Horizontal Discharge Block-Off Plate

—13—

MINIMUM

POSITION

OPEN

RE V

. B

9 8 8 1 8 A

B A

DAMPER

CLOSED

OPEN

OUTDOOR TEMP

-3

–SETPOINTS

–CCW

CONT

A CTS SHO

WN IN HIGH ENTHALPY

R U S H A T 2 4 V A C

3 m

A M IN. A

T 1

1 VDC

CONT

ACT RA

TINGS: 1.5A

RUN, 3.5A IN

OR U

NPOWERED ST

A TE

TR1

2 4V

A C

ENTHALPY CONTROL

HOOD

Example:

Given —

Negative Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.1 in. wg

Outdoor Airflow . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . 1100 cfm

Determine —

Setting = 6

Fig. 17 — Durablade Economizer Damper

Minimum Position Setting

TOP

OUTSIDE AIR SCREEN

OAT (TERMINALS ARE UP)

UNIT

Fig. 18 — Durablade Economizer Minimum

Position Damper Setting

Fig. 19 — Outdoor-Air Thermostat/

Enthalpy Control Installation

Fig. 20 — Wiring Connections for

Outdoor-Air Thermostat

—14—

Fig. 21 — Durablade Economizer Barometric Relief

CONTROLLER

BAROMETRIC RELIEF DAMPERS

OUTDOOR AIR TEMPERATURE SENSOR

GEAR-DRIVEN DAMPER

ACTUATOR

ECONOMI$ER PLUG

OUTDOOR-AIR OPENING PANEL

FILTER ACCESS PANEL

Damper Characteristics

NOTE: Be sure to engage rear EconoMi$er flange under tabs

in return air opening of the unit base. See Fig. 28.

8. Install the outdoor air block-off plate, then secure the EconoMi$er with the screws provided. See Fig. 27 and 29.

9. Remove and save the 12-pin blue and yellow wire jumper plug from the unit wiring harness located in the upper left corner and insert the EconoMi$er plug. Refer to wiring diagram Fig. 30 and 31. Also refer to Fig. 32 if installing an accessory power exhaust.

10. Remov e shipping tape from barome tric relief dampers and ensure dampers move freely.

C. Optional EconoMi$er

See Fig. 22 for EconoMi$er component locations.

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. Remove the indoor coil access panel and discard. See Fig. 23.

Controller shou ld be mounted in ve rtical position as shown in Fig. 22.

2. Assemble the hood assembly as follows: Remove the EconoMi$er hood from its packaging.

Locate the outdoor air opening panel. See Fig. 24. Remove hood assembly shipping brackets located on back (sloped) side of EconoMi$er assembly. These brackets are used to retain hood assembly during shipping only.

3. Install the

/8 x 3/4 in. seal strip on the exhaust air hood side panels and the bottom bracket. Assemble the exhaust air hood to the outdoor air opening panel as shown in Fig. 24, using the screws provided. Do

not attach hood assembly to unit at this time.

4. Install the

/8 x 7/8 in. seal strip on the outdoor air hood top and si de panels. Assemble the outdoor air hood to the outdoor air opening panel as shown in Fig. 25, using the screws provided. Do not attach hood

assembly to the unit as this time.

5. Slide the outdoor air inlet screens into the screen track on the hood side panels. While holding the screens in place, fasten the screen retainer to the hood using the screws pro vided. Repeat the process for the barometric exhaust air scree n. Do not attach

completed (Fig. 26) hood assembly to unit at this time.

6. Install the return air block-off plate over the return air duct opening. See Fig. 27.

7. Slide the EconoMi$er asse mbly into the roo ftop unit. See Fig. 28 and 29.

Fig. 22 — EconoMi$er Component Locations

Fig. 23 — Typical Access Panel Locations

—15—

OUTDOOR AIR OPENING PANEL

SEAL STRIP

EXHAUST AIR HOOD TOP

SCREEN RETAINER

EXHAUST AIR HOOD SIDES

UNIT FILTER RACK

UNIT BASE

ECONOMIZER CLIP HVAC UNIT

ECONOMIZER

ECONOMIZER REAR FLANGE

Fig. 28 — Rear EconoMi$er Flange Installation

EXHAUST AIR BOTTOM BRACKET

Fig. 24 — Exhaust Air Hood Assembly

OUTDOOR AIR OPENING PANEL

ASSEMBLED EXHAUST HOOD

Fig. 25 — Outdoor Air Hood Assembly

Fig. 26 — Completed Hood Assembly

RETURN AIR BLOCK-OFF PLATE

SEAL STRIP

OUTDOOR AIR HOOD SIDES

EXHAUST AIR SCREEN

OUTDOOR AIR HOOD TOP

SCREEN RETAINER

OUTDOOR AIR INLET SCREENS

BLOWER

FILTER

WIRING HARNESS

OUTDOOR AIR BLOCK-OFF PLATE

Fig. 29 — EconoMi$er Installed

11. Install the complete hood assembly on the unit and secure using the screws provided.

NOTE: If optional power exhaust is being installed, complete installation of power exhaust at this time. See Fig. 32 for wiring.

12. Rem ove the indoor fan motor access panel.

13. Mount the supply air temperature sensor to the lower left portion of the indoor blower housing with the two (2) screws provided (see Fig. 33). Connect the violet and pink wires to the corresponding connections on the supply air temperature sensor . Replace the indoor fan motor access panel.

Control Set Up

If a CO2 sensor is not being used, pr oce ed to the nex t s ec tio n. If a CO

sensor is being used, perform the following:

1. Deter mine th e valu e at whic h you wa nt the min imum position of the dam pers to begin opening to allow a greater amount of outdoor air to enter. The range is 800 to 1,400 ppm.

2. Locate the CO

SP (PPM) potentiometer and adjust

to the desired set point. See Fig. 34.

OUTDOOR AIR BLOCK-OFF PLATE

ECONOMI$ER

Fig. 27 — Return Air Block-Off Plate Installation

—16—

Fig. 30 — EconoMi$er Wiring

ECONOMI$ER CONTROLLER

OAT COM

OAH

-15 V RAT

COM

RAH

+15 V

(+)

COM

DAT

COM

REM POT

COM

LED

COM

BROWN VIOLET

WHITE

RED

BROWN

VIOLET WHITE

RED

TEMP TEMP COM OUT

PWR

TEMP TEMP COM

OUT PWR

V+

OUTDOOR AIR SENSOR

RETURN AIR SENSOR

SENSOR

COM VAC

SUPPLY AIR

TEMPERATURE SENSOR

PINK

VIOLET

TEMP

Fig. 31 — EconoMi$er Sensor Wiring

—17—

TO FUSED

DISCONNECT

RED

(575 VAC)

HT01AH859

SECONDARY

HANDY BOX

230VAC

2 x 4 IN.

GRAY

GREEN GND

BLACK L1 BLUE L2

RED YELH1BLU

(460 VAC)

HT01AH850

SECONDARY

COMPRESSOR 1

CONTACTOR

11 2 1

CONNECTOR

GND

230 VAC

1 PHASE

230VAC

4-PIN

PLUG

GREEN

GRAY

BLACK

BLUE

FIELD SUPPLIED WIRING

BROWN

GREEN/ YELLOW

BROWN

GREEN/ YELLOW

FAN 1

FAN 2

BLACK

LT. BLUE

BLACK

BLUE

BLACK

LT. BLUE

BLACK

BLUE

24 VAC

3-PIN

CONNECTOR

PLUG

ORANGE

YELLOW

BROWN

Fig. 32 — Wiring Diagram for Power Exhaust System

SUPPLY AIR TEMPERATURE SENSOR MOUNTING LOCATION

SUPPLY AIR TEMPERATURE SENSOR

Fig. 33 — Supply Air Sensor Mounting Location

—18—

Mechanical Cooling Lockout

200

400

600 800 1000

1200

1400 1600

FLOW (CUBIC FEET/MINUTE)

0.5

0.4

0.3

0.2

0.1

STATIC PRESSURE (IN. WG)

Determine the outdoor-air temperature at which you want the mechanical cooling (compressors) to be disabled. Locate the mechanical cooling lockout (MECH CLG LOCKOUT) potentiometer. To disable this feature, turn the potentiometer counterclockwise (CCW) to the OFF position. Otherwise, set the value between 10 and 60 F. Mechanical cooling will not operate when the ou tdoor-air temperature is belo w this value. See Fig. 34.

Dry Bulb Changeover Set Up Determine the dry bulb changeove r set point from Table 4.

The settings are A, B, C and D . Locate the ECON SP potentiometer and set the dry bulb changeover set point. See Fig. 34. When the OAT is above this set point, the damper is limited to minimum position setting.

NOTE: The EconoMi$er begins operation three minutes after power up.

WARNING: PERSONAL INJURY HAZARD . Avoid possible injury by keeping fingers away from damper blades.

See Fig. 35 for barometric relief damper characteristics.

Tabl e 4 — Changeover Set Points

SETTINGS ABCD Dry Bulb (°F) Single Enthalpy* (Btu/lb) Differential Temperature*

(°F, Not Adjustable) Differential Enthalpy*

(Btu/lb, Not Adjustable)

*Field-installed accessory.

73 69 66 63 27 25 24 22

2222

1111

If a potentiometer fails, its setting will default to the values in Table 5.

Table 5 — Default Potentiometer Settings

POTENTIOMETER DEFAULT SETTING

SP (PPM)

MECH CLG LOCKOUT ECON SP MIN POS (%)

1,000

47°

Ventilation Air (Minimum Position Set Up) If ventilation air is not required, proceed to Step 5. If ventila-

tion air is requir ed, perform the following:

1. The indoor fan must be on to set the ventilation air. Either put the thermostat in the continuous fan mode or jumper the R and G te rminals at the ro oftop unit connection board.

2. Locate the minimum position (MIN POS) potentiometer. Turn the potentiometer full CCW to fully close the outdoor air dampers. Turn the potentiometer gradually clockwise (CW) to the desired position. See Fig. 34.

3. Replace the filter ac cess panel. See Fig. 11. Ensure the filter access pan el slides along the tracks an d is securely engaged.

4. Calculate the minimum airflow across the EconoMi$er.

a. Calculate % of outside air using the following

formula. % Outdoor air through EconoMi$er

% Outdoor air =

Mixture T emp – Return Air Temp Outdoor T emp – Return Air Temp

b. Divide total CFM by percentage outdoor air, this

gives outdoor air volume in CFM.

5. Turn on base unit power.

Fig. 34 — EconoMi$er Control Adjustment

Potentiometers (Factory Settings)

Fig. 35 — Barometric Relief Capacity

VII. STEP 7 — ADJUST INDOOR-FAN SPEED

Adjust indoor-fan speed to me et jobsite requirements. For units with electric heat, requi red minimum cfm is 2250

for 548D090, 2550 for 548D102 and 3000 for 548D120 with the following exceptions:

UNIT

548D120

UNIT

VO LTAGE

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

460 50.0

575

HEATER

17.0 Horizontal

51.0 2350

UNIT CONFIGURATION

Horizontal

Vert ica l

REQUIRED

MINIMUM

CFM

3200

2800

Table 6 shows indoor-fan motor data. Table 7 shows fa n rpm at motor pulley settings for standard and alternate motors. Refer to Tables 8-13 to determine fan rpm settings. Fan motor pulleys are factory set for speed shown in Table 1.

To change fan speeds:

1. Shut off unit power supply and tag disconnect.

2. Loosen belt by loosening fan motor mounting nuts See Fig. 36 and 37.

3. Loosen movable pulley flange setscrew (see Fig. 38).

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

—19—

5. Set movable flange at nearest keyway of pulley hub and tighte n setscrew. (See Table 1 for speed ch ange 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 plate nuts.

2. Units 090,102 — Slide motor mounting plate away from fan scroll for proper belt tension ( deflection with 5 to 10 lbs of force) and tighten mounting nuts with 10 lbs torque (see Fig. 36).

Unit 120 — Slide motor mounting plate downward to tighten belt tension (

/2-in. deflection with 5 to 10 lbs of force). Secure motor mounting plate nuts with 10 lbs of torque. See Fig. 37.

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

Realign 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.

/2-in.

Fig. 37 — Typical Belt-Drive Motor

Mounting for Size 120

MOTOR MOUNTING

PLATE NUTS

Fig. 36 — Typical Belt-Drive Motor

Mounting for Sizes 090 and 102

Fig. 38 — Indoor-Fan Pulley Adjustment

—20—

Table 6 — indoor-Fan Motor Performance

UNIT

548D

INDOOR-FAN

MOTOR

UNIT

VOLTAGE

MAXIMUM ACCEPTABLE

CONTINUOUS BHP*

208/230

090

Standard

460 2.7 575 2.7

208/230

102

Standard

460 2.7 575 2.7

208/230

Standard

120

Alternate

460 2.7 575 2.7

208/230

460 3.6 575 3.6

LEGEND

BHP —

Brake Horsepower

*Extensive motor and electrical testing on these units ensures that the

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

Table 7 — Fan Rpm at Motor Pulley Settings*

UNIT 548D

090† 090** 102† 120† 120††

840 815 790 765 740 715 690 665 635 615 590 935 910 885 860 835 810 785 760 735 710 685 935 910 885 860 835 810 785 760 735 710 685 935 910 885 860 835 810 785 760 735 710 685

1085 1060 1035 1010 985 960 935 910 885 860 835

*Approximate fan rpm shown.

†Indicates standard motor and drive package. ** Indicates alternate drive package only. ††Indicates alternate motor and drive package.

MAXIMUM ACCEPTABLE

OPERATING WATTS

2.40 2120

2.90 2615

MOTOR PULLEY TURNS OPEN

MAXIMUM

AMP DRAW

6.1

7.9

—21—

Table 8 — Fan Performance 548D090 — Vertical Discharge Units

STANDARD MOTOR (BELT DRIVE)

Airflow

(Cfm)

2250 511 0.52 539 2300 518 0.55 562 2400 534 0.61 607 2500 549 0.67 653 2550 557 0.71 684 2600 565 0.74 708 2700 581 0.81 763 2800 2900 3000 3100 3200 3300 3400 3500 3600 3700 3750

STANDARD MOTOR (BELT DRIVE) (cont)

Airflow

(Cfm)

2250 2300 2400 2500 2550 2600 2700 2800 2900 3000 3100 3200 3300 3400 3500 3600 3700 3750

Bhp — Watts —

NOTES:

2. indicates alternate drive is required.

3. indicates field-supplied motor and drive are required.

4. Maximum usable watts input is 2120 and maximum continuous

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

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

1003 3.32 2886 —— — —— — —— — 1014 3.48 3009 —— — —— — —— —

Boldface

bhp is 2.40. Extensive motor and electrical testing on these units

0.2 0.4 0.6 0.8 1.0 1.2

592 0.74 708 659 0.95 875 722 1.19 1072 778 1.43 1275 829 1.68 1491 599 0.77 731 665 0.98 899 727 1.22 1097 783 1.47 1310 834 1.72 1526 613 0.84 787 677 1.06 965 738 1.30 1165 794 1.55 1378 627 0.90 835 690 1.14 1031 750 1.38 1233 805 1.64 1456 633 0.94 867 697 1.18 1064 756 1.42 1267 811 1.69 1499 639 0.97 891 703 1.22 1097 761 1.46 1301 816 1.74 1543

597 0.89 827 665 1.12 1014 733 1.40 1250 786 1.66 1473 839 1.93 1709 613 0.97 891 679 1.20 1081 745 1.50 1335 799 1.76 1560 629 1.06 965 694 1.29 1156 759 1.59 1413 812 1.88 1665 646 1.15 1039 709 1.39 1241 772 1.70 1508 825 1.99 1761 662 1.25 1123 724 1.50 1335 785 1.80 1595 840 2.11 1866 679 1.35 1207 740 1.61 1430 798 1.91 1691 696 1.46 1301 756 1.73 1534 811 2.02 1788 712 1.57 1396 771 1.85 1639 824 2.14 1892 729 1.69 1499 787 1.98 1753 839 2.21 2006 746 1.85 1613 803 2.12 1875 755 1.89 1674 811 2.20 1945

1.4 1.6 1.8 2.0

884 1.97 1744 885 2.00 1770 892 2.08 1840 902 2.18 1927 949 2.48 2188 1002 2.84 2495 1041 3.25 2831 908 2.24 1980 953 2.53 2232 1003 2.87 2521 1045 3.28 2854 913 2.29 2023 957 2.58 2275 1004 2.91 2554 1050 3.31 2878 924 2.40 2120 967 2.70 2377 1010 3.01 2637 1056 3.37 2925 935 2.52 2223 978 2.62 2479 1019 3.13 2735 1061 3.47 3002 946 2.65 2335 989 2.96 2595 1030 3.27 2847 —— — 957 2.78 2445 1000 3.09 2702 1040 3.41 2956 —— — 968 2.91 2554 1011 3.24 2832 —— — —— — 980 3.04 2661 1022 3.38 2933 —— — —— — 991 3.18 2775 —— — —— — —— —

—— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— —

LEGEND

Brake Horsepower Input to Fan Input Watts to Motor

indicates field-supplied drive is required. (See Note 7.)

652 1.04 948 717 1.31 1173 773 1.55 1378 827 1.83 1621

External Static Pressure (in. wg)

937 2.33 2058 939 2.36 2084 944 2.40 2119

External Static Pressure (in. wg)

854 2.42 2136 907 2.78 2445 956 3.15 2751 997 3.49 3017 862 2.49 2197 914 2.85 2504 963 3.23 2815 —— —

947 2.66 2343 1022 3.10 2710 979 2.69 2369 1025 3.12 2727 987 2.76 2428 1039 3.20 2791

844 1.81 1604 855 1.91 1691 861 1.96 1735 866 2.01 1779 878 2.12 1875

850 2.04 1805 900 2.34 2067 862 2.15 1901 911 2.46 2171 875 2.28 2015 923 2.58 2275

854 2.24 1980 900 2.54 2240 946 2.85 2504 868 2.37 2093 914 2.69 2369 959 3.00 2629 881 2.50 2206 928 2.84 2495 971 3.16 2759 894 2.64 2326 942 2.99 2620 984 3.22 2886

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

5. Values include losses for filters, unit casing, and wet coils.

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

7. Standard motor drive range: 590 to 840 rpm. Alternate motor drive range: 685 to 935 rpm. All other rpms require field-supplied drive.

8. Interpolation is permissible. Do not extrapolate.

887 2.41 2128 934 2.71 2386

889 2.23 1971

—22—

Table 9 — Fan Performance 548D102 — Vertical Discharge Units

STANDARD MOTOR (BELT DRIVE)

Airflow

(Cfm)

2550 557 0.71 684 633 0.94 867 2600 565 0.74 708 639 0.97 891 2700 581 0.81 763 652 1.04 948 2800 597 0.89 827 665 1.12 1014 2900 613 0.97 891 679 1.20 1081 3000 629 1.06 965 3100 646 1.15 1039 3200 662 1.25 1123 3300 679 1.35 1207 3400 3500 3600 3700 3750 3800 3900 4000 4100 4200 4250

STANDARD MOTOR (BELT DRIVE) (cont)

Airflow

(Cfm)

2550 2600 2700 2800 2900 3000 3100 3200 3300 3400 3500 3600 3700 3750 3800 3900 4000 4100 4200 4250

Bhp — Watts —

NOTES:

2. indicates field-supplied motor and drive are required.

3. Maximum usable watts input is 2120 and maximum continuous

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

Boldface

bhp is 2.40. Extensive motor and electrical testing on these units ensures that the full range of the motor can be utilized with

0.2 0.4 0.6 0.8 1.0 1.2

694 1.29 1156 759 1.59 1413 812 1.88 1665 862 2.15 1901 709 1.39 1241 772 1.70 1508 825 1.99 1761 875 2.28 2015 724 1.50 1335 785 1.80 1595 840 2.11 1866

696 1.46 1301 756 1.73 1534 811 2.02 1788 868 2.37 2093 712 1.57 1396 771 1.85 1639 824 2.14 1892 729 1.69 1499 787 1.98 1753 839 2.27 2006 746 1.82 1613 803 2.12 1875 755 1.89 1674 811 2.20 1945 763 1.95 1726 819 2.27 2006 780 2.09 1849 796 2.23 1971 813 2.39 2110 830 2.55 2249 883 2.91 2554 931 3.24 2823 —— — —— — —— — 839 2.63 2317 892 3.00 2629 939 3.34 2902 —— — —— — —— —

1.4 1.6 1.8 2.0

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

908 2.24 1980 913 2.29 2023 924 2.40 2120 935 2.52 2223 978 2.62 2479 1019 3.13 2735 1061 3.41 3002 946 2.65 2335 989 2.96 2595 1030 3.27 2847 —— — 957 2.78 2445 1000 3.09 2702 1040 3.41 2956 —— — 968 2.91 2554 1011 3.24 2832 —— — —— — 980 3.04 2661 1022 3.38 2933 —— — —— —

991 3.18 2775 —— — —— — —— — 1003 3.52 2886 —— — —— — —— — 1014 3.48 3009 —— — —— — —— —

—— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— —

LEGEND

Brake Horsepower Input to Fan Input Watts to Motor

indicates field-supplied drive is required. (See Note 6.)

740 1.61 1430 798 1.91 1691 854 2.24 1980

835 2.42 2136 884 2.72 2394 933 3.07 2686 983 3.48 3009 —— — 851 2.56 2257 900 2.89 2537 946 3.23 2815 —— — —— — 867 2.74 2411 915 3.06 2678 960 3.40 2948 —— — —— —

External Static Pressure (in. wg)

953 2.53 2232 1003 2.87 2521 1045 3.28 2854 957 2.58 2275 1004 2.91 2554 1050 3.31 2878 967 2.70 2377 1010 3.01 2637 1056 3.37 2925

External Static Pressure (in. wg)

697 1.18 1064 756 1.42 1267 811 1.69 1499 861 1.96 1735 703 1.22 1097 761 1.46 1301 816 1.74 1543 866 2.01 1779 717 1.31 1173 773 1.55 1378 827 1.83 1621 878 2.12 1875 733 1.40 1250 786 1.66 1473 839 1.93 1709 889 2.23 1971 745 1.50 1335 799 1.76 1560 850 2.04 1805 900 2.34 2067

854 2.42 2136 907 2.78 2445 956 3.15 2751 997 3.49 3017 862 2.49 2197 914 2.85 2504 963 3.23 2815 —— — 869 2.56 2257 920 2.92 2562 970 3.31 2878 —— —

911 2.46 2171

887 2.41 2128 934 2.71 2386 900 2.54 2240 946 2.85 2504

881 2.50 2206 928 2.84 2495 971 3.16 2759 894 2.64 2326 942 2.99 2620 984 3.32 2886

confidence. Using your fan motors up to the wattage ratings shown will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected.

4. Values include losses for filters, unit casing, and wet coils.

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

6. Standard motor drive range: 685 to 935 rpm. All other rpms require field-supplied drive.

7. Interpolation is permissible. Do not extrapolate.

914 2.69 2369 959 3.00 2629

923 2.58 2275

—23—

Table 10 — Fan Performance 548D120 — Vertical Discharge Units

548D120 (10 TONS) — STANDARD AND ALTERNATE MOTORS (BELT DRIVE)

Airflow

(Cfm

3000 532 0.64 630 605 0.81 763 670 0.97 891 3100 544 0.70 677 616 0.86 803 680 1.03 940 3200 557 0.75 716 628 0.93 859 3300 570 0.81 763 639 0.99 907 3400 583 0.88 818 651 1.06 965 3500 596 0.94 867 663 1.14 1031 3600 609 1.01 924 674 1.22 1097 3700 622 1.09 989 3800 635 1.16 1047 3900 649 1.25 1123 4000 662 1.33 1190 4100 675 1.42 1267 4200 4300 4400 4500 4600 4700 4800 4900 5000

548D120 (10 TONS) — STANDARD AND ALTERNATE MOTORS (BELT DRIVE) (cont)

Airflow

(Cfm)

3000 3100 3200 3300 3400 3500 3600 3700 3800 3900 4000 4100 4200 4300 4400 4500 4600 4700 4800 4900 5000

Bhp — Watts —

NOTES:

2. indicates alternate motor and drive are required.

3. indicates field-supplied motor and drive are required.

4. Maximum usable watts input is 2120 with standard motor and

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

Boldface

drive is required. (See Note 7.)

2615 with alternate motor. Maximum continuous bhp is 2.40 with

0.2 0.4 0.6 0.8 1.0 1.2

686 1.30 1165 744 1.50 1335 797 1.70 1508 847 1.91 1691 890 2.09 1849 698 1.39 1241 755 1.59 1413 808 1.80 1595 857 2.01 1779 901 2.20 1945 713 1.48 1318 767 1.68 1491 818 1.90 1683 867 2.11 1866 912 2.32 2050 722 1.57 1396 778 1.78 1578 829 2.01 1779 878 2.22 1962

689 1.52 1353 746 1.77 1569 801 1.99 1761 851 2.23 1971 702 1.61 1430 759 1.88 1665 813 2.11 1866 862 2.34 2067 715 1.72 1526 772 1.99 1761 825 2.22 1962 729 1.83 1621 785 2.10 1858 837 2.35 2076 742 1.94 1718 797 2.22 1962 756 2.06 1823 810 2.34 2067 770 2.18 1927 783 2.31 2041 797 2.44 2203 849 2.73 2460 897 3.04 2661 943 3.30 2870 984 3.44 3211 1023 3.75 3501

1.4 1.6 1.8 2.0

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

874 1.60 1422 926 1.82 1613 880 1.68 1491 933 1.87 1656 888 1.77 1569 934 1.94 1718 897 1.86 1648 907 1.97 1744 916 2.07 1831 926 2.18 1927 934 2.28 2015 943 2.41 2160 985 2.60 2334 1023 2.79 2514 1059 2.98 2688 952 2.51 2265 994 2.72 2451 1032 2.92 2633 1068 3.12 2819 962 2.63 2371 1003 2.84 2560 1042 3.06 2763 1078 3.26 2952 973 2.77 2496 1011 2.97 2679 1051 3.20 2895 1087 3.41 3097 983 2.91 2624 1021 3.11 2810 1060 3.34 3029 1090 3.51 3276

994 3.05 2754 1031 3.25 2943 1068 3.48 3166 1097 3.70 3453 1004 3.19 2885 1042 3.41 3097 1080 3.63 3388 1105 3.91 3642 1015 3.33 2020 1051 3.45 3218 1090 3.75 3493 1112 4.12 3843 1025 3.48 3166 1060 3.61 3369 1100 3.92 3655 1119 4.35 4057 1037 3.58 3335 1070 3.84 3325 1111 4.10 3822 1126 4.59 4284 1048 3.75 3494 1080 3.95 3686 1121 4.28 3995 1133 4.85 4523 1060 3.92 3659 1089 4.13 3854 1132 4.48 4174 1140 5.12 4775 1072 4.11 3830 1099 4.32 4027 1144 4.67 4359 1147 5.40 5040

LEGEND

Brake Horsepower Input to Fan Input Watts to Motor

indicates field-supplied or alternate (as appropriate)

734 1.67 1482 790 1.89 1674 839 2.12 1875 888 2.33 2058

823 2.46 2221 872 2.75 2505 919 3.00 2707 963 3.27 2847 1003 3.43 3202 836 2.60 2344 884 2.89 2605 931 3.14 2838 974 3.41 2956 1013 3.59 3349

External Static Pressure (in. wg)

940 2.03 1853 989 2.24 2031 947 2.14 1946 991 2.32 2099 956 2.25 2039

966 2.41 2134 1004 2.54 2291 1045 2.74 2478 976 2.48 2238 1013 2.66 2397 1051 2.85 2569

External Static Pressure (in. wg)

725 1.12 1014 778 1.28 1148 825 1.43 1275

690 1.10 998 746 1.28 1148 796 1.44 1284 844 1.61 1430 700 1.18 1064 757 1.36 1216 805 1.52 1353 854 1.70 1508 711 1.25 1123 767 1.44 1284 815 1.61 1430 863 1.79 1587 721 1.33 1190 777 1.52 1353 826 1.71 1517 871 1.88 1665 732 1.42 1267 787 1.61 1430 836 1.80 1595 880 1.98 1753

848 2.48 2238 896 2.72 2451 940 2.98 2688 984 3.22 2914 860 2.61 2353 908 2.86 2578 951 3.12 2727 994 3.38 3068

974 2.11 1920 983 2.16 1963 988 2.18 1980

997 2.43 2195 1043 2.64 2380

735 1.20 1081 787 1.36 1216 835 1.52 1353

873 2.46 2221 919 2.71 2442 963 2.94 2651 885 2.59 2335 929 2.85 2569 973 3.08 2782

1012 2.41 2134 1017 2.44 2177 1025 2.47 2230 1032 2.53 2282 1038 2.57 2318

standard motor and 2.90 with alternate motor. Extensive motor and electrical testing on these units ensures that the full range of the motor can be utilized with confidence. Using your fan motors up to the wattage ratings shown will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected.

5. Values include losses for filters, unit casing, and wet coils.

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

7. Standard motor drive range: 685 to 935 rpm. Alternate motor drive range: 835 to 1085 rpm. All other rpms require field-supplied drive.

8. Interpolation is permissible. Do not extrapolate.

922 2.44 2203

933 2.56 2309 898 2.45 2212 943 2.69 2424 908 2.58 2326 953 2.81 2533

—24—

Table 11 — Fan Performance 548D090 — Horizontal Discharge Units

STANDARD MOTOR (BELT DRIVE)

Airflow

(Cfm)

2250 465 0.43 473 554 0.64 630 2300 471 0.45 487 559 0.66 646 2400 482 0.50 524 569 0.71 684 2500 494 0.54 554 581 0.76 723 2550 501 0.57 577 587 0.79 747 2660 507 0.59 592 2700 520 0.65 638 2800 533 0.71 684 2900 546 0.77 731 3000 559 0.83 779 3100 572 0.90 835 3200 585 0.96 883 3300 3400 3500 3600 3700 3750

STANDARD MOTOR (BELT DRIVE) (cont)

Airflow

(Cfm)

2250 2300 2400 2500 2550 2660 2700 2800 2900 3000 3100 3200 3300 3400 3500 3600 3700 3750

Bhp — Watts —

NOTES:

Boldface

2. indicates alternate drive is required.

3. indicates field-supplied motor and drive are required.

4. Maximum usable watts input is 2120 and maximum continuous bhp is 2.40. Extensive motor and electrical testing on these units

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

598 1.03 940 671 1.32 1182 739 1.62 1439 795 1.91 1691 610 1.10 998 682 1.41 1258 750 1.72 1526 806 2.01 1779 623 1.17 1056 694 1.50 1335 761 1.82 1613 817 2.11 1866 636 1.25 1123 707 1.60 1422 772 1.93 1709 828 2.23 1971 649 1.33 1190 720 1.71 1517 783 2.03 1796 840 2.35 2076 655 1.37 1224 727 1.77 1569 789 2.09 1849

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

810 1.62 1439 816 1.65 1465 824 1.72 1526 832 1.79 1587 836 1.83 1621 839 1.87 1656 846 1.95 1726 898 2.26 1997 946 2.58 2275 987 2.91 2554 1019 3.26 2839 855 2.04 1805 906 2.35 2076 954 2.67 2352 997 3.01 2637 1034 3.36 2917 863 2.13 1884 913 2.44 2154 961 2.77 2436 1006 3.12 2727 —— — 872 2.22 1962 921 2.54 2240 969 2.88 2529 1014 3.22 2807 —— — 882 2.33 2058 930 2.65 2335 976 2.99 2620 1021 3.34 2902 —— — 892 2.45 2162 939 2.76 2428 984 3.10 2710 —— — —— — 902 2.57 2266 948 2.88 2529 993 3.21 2799 —— — —— — 912 2.69 2369 958 3.01 2637 1002 3.34 2902 —— — —— — 921 2.82 2479 968 3.15 2751 —— — —— — —— — 930 2.95 2587 978 3.29 2862 —— — —— — —— — 940 3.07 2686 —— — —— — —— — —— — 945 3.14 2743 —— — —— — —— — —— —

LEGEND

Brake Horsepower Input to Fan Input Watts to Motor

indicates field-supplied drive is required. (See Note 7.)

0.2 0.4 0.6 0.8 1.0

592 0.82 771 663 1.08 981 727 1.32 1182 784 1.58 1404 604 0.89 827 672 1.14 1031 737 1.40 1250 793 1.66 1473 615 0.95 875 683 1.20 1081 747 1.49 1327 802 1.75 1552 626 1.02 932 693 1.27 1140 756 1.57 1396 813 1.84 1630 637 1.09 989 704 1.35 1207 765 1.66 1473 823 1.94 1718 648 1.17 1056 715 1.43 1275 775 1.74 1543 832 2.05 1814 660 1.24 1114 727 1.52 1353 785 1.83 1321

1.2 1.4 1.6 1.8 2.0

850 1.91 1691 873 2.20 1945 883 2.50 2206 895 2.78 2445 859 1.94 1718 888 2.24 1980 903 2.55 2249 911 2.85 2504 872 2.01 1779 909 2.32 2050 931 2.64 2326 935 2.96 2595 882 2.09 1849 925 2.40 2119 955 2.72 2394 972 3.06 2678 887 2.13 1884 931 2.45 2162 964 2.77 2436 986 3.11 2718 891 2.17 1919 936 2.49 2197 973 2.82 2479 999 3.16 2759

External Static Pressure (in. wg)

630 0.86 803 695 1.09 989 757 1.34 1199 635 0.89 827 699 1.12 1014 760 1.37 1224 645 0.95 875 708 1.18 1064 768 1.44 1284 654 1.01 924 717 1.25 1123 776 1.51 1344 659 1.05 956 722 1.29 1156 780 1.55 1378

841 2.15 1901 851 2.26 1997 860 2.36 2084 870 2.47 2180 880 2.57 2266

846 2.42 2136 896 2.75 2420

5. Values include losses for filters, unit casing, and wet coils.

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

7. Standard motor drive range: 590 to 840 rpm. Alternate motor drive range: 685 to 935 rpm. All other rpms require field-supplied drive.

8. Interpolation is permissible. Do not extrapolate.

890 2.69 2369

—25—

Table 12 — Fan Performance 548D102 — Horizontal Discharge Units

STANDARD MOTOR (BELT DRIVE)

Airflow

(Cfm)

2550 501 0.57 577 587 0.79 747 659 1.05 956 2660 507 0.59 592 592 0.82 771 663 1.08 981 2700 520 0.65 638 604 0.89 827 672 1.14 1031 2800 533 0.71 684 615 0.95 875 683 1.20 1081 2900 546 0.77 731 626 1.02 932 3000 559 0.83 779 637 1.09 989 3100 572 0.90 835 648 1.17 1056 3200 585 0.96 883 660 1.24 1114 3300 598 1.03 940 671 1.32 1182 3400 610 1.10 998 682 1.41 1258 3500 623 1.17 1056 3600 636 1.25 1123 3700 649 1.33 1190 3750 655 1.37 1224 3800 661 1.41 1258 3900 674 1.49 1327 4000 4100 4200 4250

STANDARD MOTOR (BELT DRIVE) (cont)

Airflow

(Cfm)

2550 2660 2700 2800 2900 3000 3100 3200 3300 3400 3500 3600 3700 3750 3800 3900 4000 4100 4200 4250

Bhp — Watts —

NOTES:

Boldface

2. indicates field-supplied motor and drive are required.

3. Maximum usable watts input is 2120 and maximum continuous bhp is 2.40. Extensive motor and electrical testing on these units ensures that the full range of the motor can be utilized with

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

687 1.57 1396 759 2.05 1814 817 2.38 2102 699 1.60 1473 772 2.17 1919 712 1.75 1552 785 2.30 2032 719 1.80 1595 792 2.37 2093

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

836 1.83 1621 887 2.13 1884 839 1.87 1656 891 2.17 1919 846 1.95 1726 898 2.26 1997 855 2.04 1805 906 2.35 2076 863 2.13 1884 872 2.22 1962 882 2.33 2058 892 2.45 2162 939 2.76 2428 984 3.10 2710 —— — —— — 902 2.57 2266 948 2.88 2529 993 3.21 2799 —— — —— — 912 2.69 2369 958 3.01 2637 1002 3.34 2902 —— — —— — 921 2.82 2479 968 3.15 2751 —— — —— — —— — 930 2.95 2587 978 3.29 2862 —— — —— — —— — 940 3.07 2686 —— — —— — —— — —— — 945 3.14 2743 —— — —— — —— — —— — 949 3.20 2781 —— — —— — —— — —— — 959 3.33 2894 —— — —— — —— — —— —

—— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— —

LEGEND

Brake Horsepower Input to Fan Input Watts to Motor

indicates field-supplied drive is required. (See Note 6.)

0.2 0.4 0.6 0.8 1.0

694 1.50 1335 761 1.82 1613 817 2.11 1866 707 1.60 1422 772 1.93 1709 828 2.23 1971 720 1.71 1517 783 2.03 1796 840 2.35 2076 727 1.77 1569 789 2.09 1849 733 1.82 1613 795 2.15 1901 746 1.93 1709 806 2.26 1997

1.2 1.4 1.6 1.8 2.0

913 2.44 2154 961 2.77 2436 1006 3.12 2727 —— — 921 2.54 2240 969 2.88 2529 1014 3.22 2807 —— — 930 2.65 2335 976 2.99 2620 1021 3.34 2902 —— —

External Static Pressure (in. wg)

693 1.27 1140 756 1.57 1396 813 1.84 1630 704 1.35 1207 765 1.66 1473 823 1.94 1718 715 1.43 1275 775 1.74 1543 832 2.05 1814 727 1.52 1353 785 1.83 1321 841 2.15 1901 739 1.62 1439 795 1.91 1691 851 2.26 1997 750 1.72 1526 806 2.01 1779 860 2.36 2084

828 2.50 2206 885 2.88 2529 935 3.23 2815 840 2.64 2326 897 3.03 2653 947 3.39 2940 846 2.71 2386 903 3.10 2710 —— —

External Static Pressure (in. wg)

931 2.45 2162 964 2.77 2436 986 3.11 2718 936 2.49 2197 973 2.82 2479 999 3.16 2759 946 2.58 2275 987 2.91 2554 1019 3.26 2839 954 2.67 2352 997 3.01 2637 1034 3.36 2917

4. Values include losses for filters, unit casing, and wet coils.

5. Use of a field-supplied motor may affect wire sizing. Contact your

6. Standard motor drive range: 685 to 935 rpm. All other rpms

7. Interpolation is permissible. Do not extrapolate.

722 1.29 1156 780 1.55 1378 727 1.32 1182 784 1.58 1404 737 1.40 1250 793 1.66 1473 747 1.49 1327 802 1.75 1552

870 2.47 2180 880 2.57 2266

890 2.69 2369 846 2.42 2136 896 2.75 2420 852 2.48 2188 901 2.80 2462 863 2.61 2300 912 2.93 2571 874 2.75 2420 923 3.08 2694

confidence. Using your fan motors up to the wattage ratings shown will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected.

representative to verify.

require field-supplied drive.

—26—

Table 13 — Fan Performance 548D120 — Horizontal Discharge Units

STANDARD AND ALTERNATE MOTORS (BELT DRIVE)

Airflow

(Cfm)

3000 484 0.55 562 560 0.70 677 631 0.87 810 3100 495 0.61 607 570 0.76 723 638 0.92 851 3200 505 0.66 646 579 0.81 763 646 0.98 899 3300 516 0.72 692 589 0.87 810 655 1.05 956 3400 527 0.78 739 599 0.93 859 664 1.11 1006 3500 537 0.85 795 609 0.99 907 672 1.18 1064 3600 548 0.92 851 619 1.05 956 680 1.24 1114 3700 560 1.00 916 629 1.12 1014 3800 571 1.08 981 639 1.19 1072 3900 582 1.16 1047 649 1.27 1140 4000 593 1.25 1123 659 1.35 1207 4100 605 1.35 1207 670 1.44 1284 4200 616 1.45 1292 680 1.53 1361 4300 628 1.56 1387 4400 639 1.67 1482 4500 651 1.78 1578 4600 662 1.91 1691 4700 674 2.03 1796 4800 4900 5000

STANDARD AND ALTERNATE MOTORS (BELT DRIVE) (cont)

Airflow

(Cfm)

3000 3100 3200 3300 3400 3500 3600 3700 3800 3900 4000 4100 4200 4300 4400 4500 4600 4700 4800 4900 5000

Bhp — Watts —

NOTES:

Boldface

1. drive is required. (See Note 7.)

2. indicates alternate motor and drive are required.

3. indicates field-supplied motor and drive are required.

4. Maximum usable watts input is 2120 with standard motor and 2615 with alternate motor. Maximum continuous bhp is 2.40 with

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

686 2.17 1919 744 2.20 1945 797 2.36 2084 698 2.31 2041 755 2.33 2058 710 2.45 2212 766 2.47 2230 818 2.61 2353 866 2.86 2578 910 3.12 2819

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

800 1.38 1233 850 1.52 1353 879 1.38 1233 925 1.81 1604 805 1.44 1284 857 1.63 1447 896 1.66 1473 935 1.93 1709 812 1.51 1344 862 1.71 1517 908 1.85 1639 819 1.59 1413 867 1.78 1578 915 1.98 1753 827 1.67 1482 873 1.85 1639 920 2.07 1831 833 1.75 1552 880 1.94 1718 926 2.15 1901 840 1.83 1621 888 2.04 1805 931 2.23 1971 847 1.92 1700 895 2.13 1884 856 2.02 1788 901 2.23 1971 865 2.12 1875 908 2.32 2050 875 2.22 1962 883 2.32 2050 889 2.41 2177 934 2.65 2389 972 2.87 2587 1015 3.12 2819 1053 3.34 3029 896 2.51 2265 943 2.77 2406 980 2.99 2698 1021 3.23 2923 1061 3.48 3166 903 2.62 2362 951 2.89 2603 990 3.12 2819 1028 3.36 3049 1068 3.61 3241 912 2.74 2469 958 3.00 2707 999 3.26 2982 1035 3.51 3161 1074 3.74 3346 921 2.87 2587 965 3.11 2810 1008 3.39 3078 1041 3.68 3295 1081 3.90 3450 930 3.00 2707 972 3.23 2923 1017 3.45 3224 1048 3.80 3436 1088 4.13 3552 938 3.14 2838 980 3.37 3058 1025 3.55 3362 1055 3.85 3584 1095 4.30 3653 946 3.27 2962 990 3.51 3149 1034 3.71 3505 1062 3.98 3741 1101 4.45 3753 954 3.39 3078 998 3.62 3271 1042 3.85 3654 1068 4.08 3907 1108 4.59 3851

LEGEND

Brake Horsepower Input to Fan Input Watts to Motor

0.2 0.4 0.6 0.8 1.0

690 1.63 1447 747 1.83 1621 798 2.05 1814 849 2.30 2032 701 1.73 1534 757 1.92 1700 807 2.16 1910 712 1.84 1630 767 2.02 1788 817 2.27 2006 722 1.95 1726 777 2.13 1884 827 2.38 2102 733 2.07 1831 787 2.24 1980

1.2 1.4 1.6 1.8 2.0

915 2.42 2186 960 2.65 2389 1000 2.87 2587 1039 3.10 2800 924 2.54 2291 966 2.76 2487 1008 2.99 2698 1046 3.21 2904

indicates field-supplied or alternate (as appropriate)

External Static Pressure (in. wg)

688 1.31 1173 747 1.51 1344 802 1.73 1534 698 1.39 1241 756 1.60 1422 810 1.81 1604 708 1.47 1310 764 1.69 1499 816 1.89 1674 717 1.56 1387 773 1.78 1578 823 1.98 1753 727 1.65 1465 781 1.86 1648 832 2.08 1840 737 1.74 1543 789 1.95 1726 841 2.18 1927

808 2.48 2238 856 2.73 2460 900 2.99 2698

External Static Pressure (in. wg)

938 2.33 2108

945 2.44 2203 986 2.65 2389 1029 2.89 2605 953 2.55 2300 993 2.75 2478 1034 3.00 2707

5. Values include losses for filters, unit casing, and wet coils.

6. Use of a field-supplied motor may affect wire sizing. Contact your

7. Standard motor drive range: 685 to 935 rpm. Alternate motor drive

8. Interpolation is permissible. Do not extrapolate.

690 1.03 940 747 1.20 1081 699 1.10 998 755 1.27 1140 708 1.16 1047 761 1.34 1199 717 1.23 1106 767 1.40 1250 724 1.30 1165 775 1.48 1318 731 1.36 1216 784 1.56 1387 738 1.43 1275 794 1.64 1456

858 2.41 2177 866 2.51 2265

836 2.50 2256 882 2.73 2460 846 2.62 2362 891 2.85 2569

944 2.01 1836 984 2.09 1903 952 2.11 1920 993 2.22 2014 963 2.21 2005 1001 2.31 2091

970 2.41 2134 1007 2.46 2221 976 2.47 2230 1017 2.62 2362 981 2.56 2309 1024 2.77 2496

representative to verify.

range: 835 to 1085 rpm. All other rpms require field-supplied drive.

874 2.62 2362

964 1.92 1761 975 1.98 1811

—27—

PRE-START-UP

WARNING: Failure to observe the following 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 compressor termi nal cover until all electrical sources are disconnected and tagged.

4. Relieve all pressure from system before touching or disturbing anything inside compressor terminal box if refrigerant leak is suspected around compressor terminals. Use accepted methods to recover 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- and factory-wiring connections.

Be sure that connections are completed and tight. Ensure electrical wiring does not come into contact with refrigerant tubing or sharp edges.

d. Inspect coil fins. If damaged during shipping and

handling, carefully straighten fins with a fin comb.

4. Verify the following conditions:

a. Make sure that outdoor-fan blades are corre ctly

positioned in fan orifice. Refer to Outdoor Fan Adjustment section on page 32 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.

e. Ensure belt and blower pulley are properly

aligned and at correct tension.

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 SCREEN

Outdoor-air inlet screen must be in place before operating 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 tio ns in uni t co ntr ol b oxe s; tighte n as required. Ensure wirin g does no t come in to direct c ontact with refrigerant tubing or sharp edges.

VI. REFRIGERANT SERVICE PORTS

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

VII. HIGH FLOW VALVES

Located on the compressor hot gas and suction tubes are High Flow Valves. Large black plastic caps distinguish these valves with O-rings located inside the caps. These valves cannot be accessed for service in the field. Ensure the plastic caps are in place and tight or the possibility of refrigerant leakage could occur.

VIII. COMPRESSOR ROTATION

It is important to be certain the scro ll com pres sor i s rotati ng 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 indoor fan is probably also rotating in the wrong direction.

2. Turn off power to the unit and tag disconnect.

3. Reverse any two of the unit power leads.

4. Turn on power to the unit. Reenergize compressor.

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

—28—

NOTE: When the compressor is rota ting in the wrong direction, the unit makes an elevated level of noise and does not provide heating/cooling.

IX. ADJUST GAS INPUT

The gas input to the unit is determined by mea suring the gas flow at the met er or by measu ring the manif old p ress ure . Manifold pressure should be 3.5 in. wg.

X. COOLING

To st a rt u nit , tu rn on main power supply. Set system selector switch at COOL position and fan switch at AUTO position. Adjust thermostat to a setting below room temperature. Compressor indoor and outdoor fans start on closure of contactors.

Check unit charge. Refer to Refrigerant Charge section on page 32. Unit must operate for at least 15 minutes before adjusting charge.

Reset thermostat at a position above room temperature. Compressor and outdoor fans 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.

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

XI. HEATING

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

temperature, fan at AUTO position. First stage of thermostat energizes the indoor fan motor,

compressor, and outdoor fan; second stage energ izes electric heater elements if installed. Check heating effects at air supply grille(s ).

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

To Shut Unit Off

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

XII. 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.

XIII. VENTILATION (CONTINUOUS FAN)

Set fan and system selector switches at ON and OFF positions, respectively. Indoor fan operates continuously to provide constant air circulation.

XIV. OPERATING SEQUENCE

A. Cooling, Units Without Economizer

When the thermostat call s for cooling, terminals G and Y1 are energized. The indoor fan contactor (IFC), outdoor fan contactor (OFC), RVS1 (reversing valve solenoid), and

compressor contactor no. 1 (C1) are energized and the indoor-fan motor, compressor no. 1, outdoor-fan motors and outdoor fans start. The outdoor-fan motors run continuously while unit is cooling. If the thermostat calls for a second stage of cooli ng by en ergi zi ng Y2 , com pre ss o r con ta cto r no. 2 (C2) and RVS2 are energized and compressor no. 2 starts.

B. Heating, Units Without Economizer

Upon a call for heating through terminal W1, IFC, OFC, C1, and C2 are ene rg iz ed. O n un it s eq uipp e d f o r 2 s t ag es of heat, when additional heat is needed, HC is energized through W2.

C. Cooling, Units With Durablade Economizer

When the outdoor-air temperature is above the OAT setting and the room thermostat calls for cooling, the compressor contactor no. 1 and outdoor fan contactor (OFC) are energized to start compressor no. 1 and outdoor-fan motors. RVS1 (reversing va lve sole noid) is energi zed). The indoor-fan motor (IFM) is energ ized and the econom izer dampe r moves to the minimum position. Upon a further call for cooling, compressor contactor no. 2 will be energized, starting compressor no. 2. RVS2 is energized. After the thermostat is satisfied and the IFM is deenergized, the dampe r moves to the fully closed posi tion.

When the outdoor-air temperature is below the OAT setting and the thermostat calls for Y1 and G, the economizer damper moves to the minimum position when the indoor fan starts. The first stage of cooling is provided by the economizer. If the supply-air temperature is above 57 F, a switch on the supply-air thermostat is closed between the T2 terminal and the 24 vac terminal. This causes the damper to continue to modulate open until the supply-air temperature falls below 55 F or the damper reaches the fully open position.

When the supply-air temperature is between 55 F and 52 F, the supply-air thermostat has open switches between the T2 and 24 vac terminals and between the T1 and 24 vac terminals. This causes the economizer damper to remain in an intermediate open position.

If the supply-air temperature falls below 52 F, a switch on the supply-air the rmostat is closed bet ween the T1 terminal and the 24 vac terminal. This c auses the damper to modulate closed until the s uppl y- air tempe ra tu re ri ses abov e 5 5 F or the damper reaches the minimum position.

When the supply-air temperature is between 55 F and 57 F, the supply-air thermostat has open switches between the T2 and 24 vac terminals. This causes the ec onomi zer dampe r to remain in an intermediate open position.

If the outdoor ai r alone cannot satisfy the cooling requirements of the conditioned space, economizer cooling is integrated with mechanical cooling, providing second stage cooling. Compressor no. 1 and outdoor fans will be energized, and the position of the economizer damper will be determined by the supply-air temperature. Compressor no. 2 is locked out.

When the second stag e of c o oli ng is sati sfie d, t he c omp re sso r, RVS2, and outdoor fan motors will be deenergized. The damper position will be determined by the supply-air temperature.

When the first stage of cooling is satisfied, the damper will move to fully closed position.

—29—

D. Cooling, Units With EconoMi$er

When the Outdoor Air Temperature (OAT) is above the ECON SP set point and the room thermostat calls for Stage 1 cooling (R to G + Y1), the indoor-fan motor (IFM) is energized and the EconoMi$er damper modulates to minimum position. The compressor cont actor and OFC are energized starting the compressor and outdoor-fan motor (OFM). After the thermostat is satisfied, the damper modulates to the fully closed pos ition when the IFM is deenergized.

When the OAT is below the ECON SP setting and the room thermostat calls for Stage 1 cooling (R to G + Y1), the EconoMi$er modulates to the minimum position when the IFM is energized. The EconoMi$er provides Stage 1 of cooling by modulating the return and outdoor-air dampers to maintain a 55 F supply air set point. If the supply-air temperature (SAT) is greater than 57 F, the EconoMi$er modulates open, allowing a greater amount of outdoor air to ente r the unit. If th e SA T dr ops bel ow 53 F, the outdoor-air d am per modulates closed to reduce t he amo unt of out door air. When the SAT is between 53 and 57 F, the EconoMi$er ma intains its position.

If outdoor air alone cannot satisfy the cooling requirements of the conditione d space, and the OAT is above the MECH CLG LOCKOUT set point, the EconoMi$er integrates free cooling with mechanic al c oolin g. This is acco mpl ishe d b y t he strategies below.

NOTE: Compressors have a two-minute Minimum On, Minimum Off, and Interstage delay timer.

1. If Y1 is energized, and the ro om thermostat cal ls for Y2 (2-stage thermostat), the compressor number 1 and OFM are energized. The position of the EconoMi$er damper is maintained at its current value.

2. If Y1 is energized for more then 20 minutes, and Y2 is not energized (whether or not a 2-stage thermostat is used), compressor no. 1 and OFM are energized. The position of the EconoMi$er damper is maintained at its current value.

3. If Y1 is energized, and compressor no. 1 is already energized and the room thermostat calls for Y2, compressor no. 1 continues to operate. If Y2 remains energized for more than 20 minutes, compressor no. 2 is energized.

NOTE: Compressor no. 2 cannot be energized unless there is a signal for Y2 from the space thermostat.

4. If compressor no. 2 is energized, and the Y2 signal from the thermostat is satisfied, compressor no. 1 and 2 are deenergized. Re-asserting Y2 will start compressor no. 1 and (after a 20-minute interstage delay) compressor no. 2.

5. If compresso r no. 1 is energized and the thermostat is satisfied, compressor no. 1, the OFM, and IFM are deenergized and the EconoMi$er modulates closed.

When the OAT is below the MECH CLG LOCKOUT set point, the compressors re main off.

E. Heating, Units With Economizer (If Accessory Heater is Installed)

When the room therm ostat calls for heat through terminal W1, the indoor-fan contactor outdoor fan contactor, C1, and C2 are energized. On units equipped for 2 stages of heat, when additional heat is needed, heater contactor is

energized through W2. The indoor-fan motor is energized, and the economizer dam per m oves to th e min imu m positi on. If the two-position damper is used, the outdoor-air damper opens to the minimum position whenever the indoor fan opens. When the thermostat is satisfied, the da mper moves to the fully closed position.

F. D e fro s t

When the tempera ture of the outdoo r coil drops bel ow 28 F as sensed by the defros t thermostat (DFT2) and the defr ost timer is at the end of a timed period (adjustable at 30, 50, or 90 minutes), reversing valve solenoids (RVS1 and RVS2) are energized and the OFC is deenergized. This switches the position of the reversing valves and shuts off the outdoor fans. The electric heaters (if installed) will be energized.

The unit continues to defrost until the coil temperature as measured by DFT2 re aches 65 F, or th e duration of defrost cycle completes a 10-minut e period.

During the defrost mode, if circuit 1 defrosts first, RVS1 will oscillate between heating and cooling modes until the defrost mode is comple te.

At the end of the defrost cycle, the electric heaters (if installed) will be deen ergized; the r eversin g valve s swi tch and the outdoor-fan motors will be energized. The unit will now operate in the heati ng mode.

If the space thermostat is satisfied during a defrost cycle, the unit will continue in the defrost mode until the time or temperature constraints are satisfied.

SERVICE

CAUTION: When servicing unit, shut off all elec-

trical power to unit and install lock out tag to avoid shock hazard or injury from rotating parts.

I. CLEANING

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

A. Indoor Coil

1. Turn unit power off and tag disconnect. Remove filter access panel and indoor coil access panel.

2. If economizer or accessory two-position damper is installed, remove economizer/two-position damper by disconnecting economizer plug and removing mounting screws (see Fig. 14, 15, or 2 2). Refer to Accessory Economizer or Two-Position Damper Installation Instructions for more details.

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, backflush toward return-air section to remove foreign material. Caution should be taken as to not overflow the evaporator drain condensate pan.

5. Flush condensate pan after completion.

6. Reinstall econom izer/two-position damper and filters.

7. Reconnect wiring.

8. Replace access panels.

—30—

B. Outdoor 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 tag disconnect.

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

3. Remove outdoor coil corner post. See Fig. 39. To hold top panel open, place coil corner post between top panel and center post. See Fig. 40.

4. Remove device holding coil sections together at return end of outdoor coil. Carefully separate the outer coil section 3 to 4 in. from the inner coil section. See Fig. 41.

5. Use a water hose or other su it ab le equipment to flush down between the 2 coil sections to remove dirt and debris. Clean the outer surfaces with a stiff brush in the normal manner.

6. Secure the sections together. Reposition the coil sections, and remove the coil co rner post from between the top panel and center post. Install the coil corner post and coil center post, and replace all screws.

C. Condensate Drain

Check and clean each year at start of cooling season. In winter, keep drain dr y or protect against freeze-up.

Fig. 39 — Cleaning Outdoor Coil

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 m ent 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 disposable filters in place o f screens.

F. B e lt s

Adjust belt tension and pulley alignment at least twice a year or more frequently as operating conditions require.

II. LUBRICATION

A. Compressors

Each compressor is charged with correct amount of oil at the factory.

B. Fan Motor Bearings

Fan motor bearings are permanently lubricated. No further lubricatio n of outdoor- or indoor-fan motors is req uired.

Fig. 40 — Propping Up Top Panel

Fig. 41 — Separating Coil Sections

—31—

III. OUTDOOR FAN ADJUSTMENT (Fig. 42)

1. Shut off unit power supply.

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

3. Adjust fan height as shown in Fig. 42.

4. Tighten setscrews a nd replace outdoor-fan assembly.

UNIT

VOLTAGE 208/230 V

460 V and 575 V

‘‘A’’

in.

2.75

3.50

Fig. 42 — Outdoor Fan Adjustment

IV. ECONOMIZER ADJUSTMENT

Refer to Optional Economizer sections on pages 11 and 15. IMPORTANT: Refer to Troubleshooting Tables 14-16 for addi-

tional information.

V. REFRIGERANT CHARGE

A. Checking and Adjustment Refrigerant Charge

The refrigerant system is fully charged with R-22 refrigerant, tested, and factory-sealed. Unit must operate in cooling mode a minimum of 10 minutes before checking charge.

NOTE: Adjustment of the refrigerant charge is not required unless the unit is suspected of not having the proper R-22 charge.

A superheat charging chart is attached to the outside of the service access panel. The chart include s the re quire d sucti on line temperature at given suction line pressures and outdoor ambient te mp eratures.

An accurate superheat, thermocouple- or thermistor-type thermometer and a gage manifold are required when using the superheat charging method for evaluating the unit charge. Do not use me rcury or small dial-type thermome ters

because they are not adequate for this type of measurement.

c. Suction-tube temperature (F) at low-side service

fitting.

d. Suction (low-side) pressure (psig).

5. Using “Cooling Charging Charts” compare outdoorair temperature (F db) with the suction line pressure (psig) to determine desired system operating suction line temperature. See Fig. 43-45.

6. Compare actual suction-tube temperature with desired suction-tube temperature. Using a tolerance of ± 3° F, add refrigerant if actual temperature is more than 3° F higher than proper suction-tube temperature, or remove refrigerant if actual temperature is more than 3° F lower than re quired suction-tube temperature.

B. To Use Cooling Charging Charts

Take the outdoor ambient temperatur e and read the suction pressure gage. Refer to appropriate chart to determi ne what the suction temperature should be. If suction temperature is high, add refrigerant. If suction te mperature is low, carefully recover some of the charge. Recheck the sucti on pressure as charge is adjusted.

EXAMPLE: (Fig. 43)

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

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

Suction Temperature should be . . . . . . . . . . . . . . . . . . . . 49 F

(Suction Temperature may vary ±5° F.)

C. Heating Mode Charge

Do not attempt to adjust char ge by c oolin g me thods w hile in Heating mode. When charging is necessary in Heating mode, recover refrigerant and weigh in according to unit data plate refrigerant data.

CAUTION: When evaluating the refrigerant charge, an indicated adjustment to the specified factory charge mus t al ways be very minimal . If a substantial adjustment is indicated, an abnormal condition exists somewhere in the cooling s ystem, su ch as insufficient airflow across either coil or both coils.

Proceed as follows:

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

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

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

4. Measure and record the following:

a. Outdoor ambient-air temperature (F db). b. Evaporator inlet-air temperature (F wb).

Fig. 43 — Cooling Charging Chart, 548D090

—32—

Fig. 44 — Cooling Charging Chart; 548D102

Fig. 45 — Cooling Charging Chart; 548D120

—33—

PROBLEM CAUSE REMEDY

Compressor and outdoor fan will not start.

Compressor will not start but outdoor fan runs.

Compressor cycles (other than normally satisfying thermostat).

Compressor operates continuously.

Scroll compressor makes excessive noise.

Excessive head pressure

Head pressure too low.

Excessive suction pressure.

Suction pressure too low.

Compressor no. 2 will not run.

TROUBLESHOOTING

Refer to Tables 14-16 and Fig. 46 for troubleshooting information.

Tabl e 14 — Heating and Cooling Troubleshooting

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

High-pressure switch tripped. See problem ‘‘Excessive head pressure.’’ Low-pressure switch tripped. Check for leaks, repair, and recharge. Freeze-up protection thermostat tripped. See problem ‘‘Suction pressure too low.’’ Faulty wiring or loose connections in compressor circuit. Check wiring and repair or replace. Compressor motor 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.

Refrigerant overcharge or undercharge. Recover refrigerant, evacuate system, and

Defective compressor. Replace and determine cause. Insufficient line voltage. Determine cause and correct. Blocked outdoor coil or dirty air filter. Determine cause and correct. Defective overload. Determine cause and replace. Defective thermostat. Replace thermostat. Faulty outdoor-fan (cooling) or indoor-fan (heating) motor or

capacitor. 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

Outdoor coil dirty or restricted. Clean coil or remove restriction. Compressor rotating in the wrong direction. Reverse the 3-phase power leads as described in

Dirty air filter. Replace filter. Dirty outdoor coil. Clean coil. Refrigerant overcharged. Remove excess refrigerant. Air in system. Recover refrigerant, evacuate system, and

Condensing air restricted or air short-cycling. Determine cause and correct. Low refrigerant charge. Check for leaks, repair, and recharge. Compressor valves leaking. Replace compressor. Restriction in liquid tube. Remove restriction. High heat load. Check for source and eliminate. Compressor valves leaking. Replace compressor. Refrigerant overcharged. Recover excess refrigerant. Dirty air filter (cooling) or dirty outdoor coil (heating). Replace filter or clean coil. Low refrigerant charge. Check for leaks, repair, and recharge. Metering device or low side restricted Remove source of restriction. Insufficient indoor airflow (cooling mode). 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.

temperature.

Determine cause. Replace compressor.

Determine cause.

recharge to nameplate.

Replace.

recharge.

Start-Up, page 28.

recharge.

necessary.

—34—

Table 15 — Durablade Economizer Troubleshooting

PROBLEM CAUSE REMEDY

Damper does not open.

Economizer operation limited to minimum position.

Damper does not close.

Economizer damper does not close on power loss.

LEGEND

C1 — EC — IFC — IFO — OAT — PL — SAT — SW —

Common Power Enthalpy Control Indoor Fan Contactor Indoor Fan On Outdoor-Air Thermostat Plug Supply-Air Thermostat Economizer Position Switch

Indoor fan is off. 1. Check to ensure that 24 vac is present at terminal C1 on the IFC or that 24 vac is

No power to economizer motor.

Economizer motor failure. If the indoor fan and economizer motor are energized, verify that there is a minimum

OAT or EC set too high. 1. Set at correct temperature (3 F below indoor space temperature).

Economizer control board incorrectly wired or not functioning.

Incorrect SAT wiring or inoperative SAT.

Incorrect economizer wiring.

Incorrect damper actuator wiring or inoperative economizer circuit board.

Incorrect SAT wiring or inoperative SAT.

Economizer motor failure. If economizer control board and SAT are functioning properly, verify that there is a

Insufficient battery power, inoperative economizer control board.

present at the IFO terminal. Check whether 24 vac is present at PL6-1 (red wire) and/or PL6-3 (black wire). If 24 vac is not present, check wiring (see unit label diagram).

2. Check proper thermostat connection to G on the connection board.

1. Check that SW3 is properly making contact with the damper blade. Check that SW1 is in the NC (normally closed) position.

2. Check diode D18. If diode is not functioning properly, replace economizer control board.

3. Confirm that the economizer control board is grounded properly at PL6-4 (brown wire) and at brown terminal of the economizer control board (brown wire). The economizer motor must also be grounded properly at the negative motor terminal (brown wire).

4. Verify SW1 and SW3 are working and wired properly (see unit label diagram).

5. Check for 24 vac input at both PL6-1 (red wire) and PL6-3 (black wire). If 24 vac not present, check unit wiring (see unit label diagram). If 24 vac is found in both places, check for 24 vac at the yellow terminal of the economizer control board (yellow wire). If 24 vac power is not present, replace the economizer control board.

of 18 vdc at the positive motor terminal. If the motor is not operating, replace the motor.

2. Check OAT or EC by setting above outdoor temperature or humidity level. If the OAT or EC switches do not close, replace OAT or EC.

1. Perform the following tests when OAT or EC is closed. Y1 is called for, and damper is at minimum position. Confirm 24 vac on gray terminal of the economizer control board (gray wire). If 24 vac is not present, check wiring (see unit label diagram).

2. Verify that SW1 and SW3 are wired correctly and working properly (see unit label diagram).

3. Check to ensure that 24 vac exists at PL6-2 (blue wire). If 24 vac is not present, check wiring (see unit wiring label diagram).

4. Check 24 vac output at PL6-10 (white wire). If 24 vac is not present, replace economizer control board.

1. After verifying that the OAT and EC settings and the economizer control board wiring are correct, check to ensure that the 24 vac terminal of the SAT has 24 vac (white wire). If OAT, EC, and control board are functioning and wired properly and no 24 vac exists, check wiring (see unit label diagram).

2. If supply-air temperature is greater than 57 F, 24 vac should be found at terminal T2 on the SAT (pink wire). If 24 vac is not present, replace SAT.

1. Verify that SW2 and SW4 are wired and working properly (see unit label diagram).

2. Check diode D19. If diode is not functioning properly, replace economizer control board.

1. After verifying that the wiring is correct, modulate the damper to the minimum position. Remove the calls for G.

2. If the damper does not move, check for 24 vac at PL6-1 (red wire). If 24 vac is not present, check wiring (see unit label diagram).

3. If damper still does not move, check for 24 vac at blue terminal of economizer control board (blue wire). If 24 vac is not present, replace the economizer control board.

1. After verifying that the wiring is correct and the economizer control board is functioning properly, place the OAT or EC switch in the closed position. Place a call for Y1 and open the damper to the fully open position. Confirm that the 24 vac terminal of the SAT has 24 vac (white wire). If 24 vac is not present, check wiring (see unit label diagram).

2. If supply-air temperature is less than 52 F, 24 vac should be found at terminal T1 on the SAT (violet wire). If 24 vac not found, replace SAT.

minimum of 18 vdc at the positive motor terminal. If a minimum of 18 vdc is present and the motor is still not operating, replace the motor.

1. Check voltage potential across batteries. If lower than 14 vdc, replace close-onpower-loss power supply (9-v alkaline batteries). Check this emergency power supply on a regular basis or whenever the filters are changed.

2. If the close-on-power-loss and economizer control board are functioning properly, check for 14 vdc or higher at the blue terminal of the economizer control board (blue wire) when power is disconnected from unit. If 14 vdc is not present, replace the control board.

—35—

PROBLEM CAUSE REMEDY

Damper does not open.

EconoMi$er operation limited to minimum position.

Damper position less than minimum position set point.

Damper does not return to minimum position.

Damper does not close on power loss

IFM — OAT —

LEGEND

Indoor-Fan Motor Outdoor-Air Temperature

Table 16 — EconoMi$er Troubleshooting

Indoor Fan is Off. Check to ensure that 24 vac is present at Terminal C1 (Common Power)

No power to EconoMi$er controller.

No power to G Terminal. If IFM is on, check to ensure 24 vac is present on G Terminal of the

Controller fault. If STATUS light is flashing one flash, the EconoMi$er controller is

Thermostat fault. If STATUS light is flashing two flashes, the EconoMi$er controller senses

Actuator Fault. Check the wiring between the EconoMi$er controller and the actuator.

Minimum position set incorrectly.

EconoMi$er changeover set point set too high or too low.

Supply air temperature sensor faulty.

Outdoor air temperature sensor faulty.

Supply air low limit strategy controlling.

ventilation strategy

controlling.

Damper travel is restricted.

on the IFC (Indoor Fan contactor) or that 24 vac is present at the IFO (Indoor Fan On) terminal. Check whether 24 vac is present at PL (Plug) 6-1 (red wire) and/or PL6-3 (black wire). If 24 vac is not present, check wiring (see unit label diagram).

Check proper thermostat connection to G on the connection board. Check to ensure that 24 vac is present across Terminals 24 VAC and

24V COM on the EconoMi$er control. If 24 vac is not present, check wiring (see unit label diagram). If 24 vac is present, STATUS light should be on constantly.

EconoMi$er controller. If 24 vac is not present, check wiring (see unit label diagram).

experiencing a fault condition. Cycle power to the controller. If condition continues, replace the EconoMi$er controller.

the thermostat is wired incorrectly. Check wiring between the thermostat and the connection board in the electrical panel. The fault condition is caused by Y2 being energized before Y1.

Hold CONFIG button between three and ten seconds to verify the actuator’s operation. (This process takes three minutes to complete.)

Verify that the MIN POS (%) is set greater than zero. Adjust MIN POS (%) to 100% to verify operation, and then set to correct setting.

Set at correct value. See Table 4.

If STATUS light is flashing 4 flashes, the supply air temperature sensor is faulty. Check wiring or replace sensor.

If STATUS light is flashing 5 flashes, the outdoor-air temperature sensor is faulty. Check wiring or replace sensor.

The supply air temperature is less than 45 F, causing the minimum position to decrease. Refer to the Start-Up instructions. Verify correct setting of MIN POS (%). If correct, EconoMi$er is operating correctly.

If a CO2 sensor is being used, and the damper position is greater than minimum position, the ventilation control strategy is controlling. Refer to the Start-Up instructions. EconoMi$er is operating correctly.

Check to ensure the damper is not blocked.

—36—

Fig. 46 — Typical Wiring Diagram

—37—

NOTES:

1. If any of the original wire furnished must be replaced, it must be replaced with type 90° C wire or its equivalent.

2. Three-phase motors are protected under primary single-phasing conditions.

3. Thermostat: HH07AT172 and P272-2783 Subbase: HH93AZ176, 178 and P272-1882, 1883

4. Set Heat anticipator at .8 amp for 1st stage and .3 amp for 2nd stage.

5. Use copper conductors only.

6. Use copper, copper clad aluminum or aluminum conductors.

VOLTAGE

RATING

24 V W28X-1024-3.2 3.2

Mfg. Pt. No.

Potter &

Brumfield

MUST

TRIP

AMPS

AHA — AWG — C — CAP — CB — CC — CH — CLO — COMP — D — DB — DFT — EC — ECON — EPS —

EQUIP — ER — FPT — FU — GND — HC — HPS — HR — IFC — IFM — IFMOVL — LPS — LSM — MCA — MTR — OAT — OFC — OFM — P — PL — QT —

Adjustable Heat Anticipator American Wire Gage Contactor, Compressor Capacitor Circuit Breaker Cooling Capacitor Crankcase Heater Compressor Lockout Compressor Motor Diode Defrost Board Defrost Thermostat Enthalpy Control Economizer Emergency Power Supply (nine volt battery) Equipment Economizer Relay Freeze-Up Protection Thermostat Fuse Ground Heater Contactor (Strip Heat) High-Pressure Switch Heater Relay Indoor Fan Contactor Indoor Fan Motor Indoor Fan Motor Overload Switch Low-Pressure Switch Limit Switch (Manual Reset) Minimum Circuit Amps Motor Outdoor Air Ther mostat Outdoor Fan Contactor Outdoor Fan Motor Plug Plug Assembly Quadruple Terminal

LEGEND

R — RVS — SAT — SW1 — SW2 — SW3 — SW4 — TB — TC — TH — TRAN —

Relay Reversing Valve Solenoid Supply Air Thermostat Switch Fully Open Switch Fully Closed Switch Minimum Vent Position Switch Maximum Vent Position Te r m ina l Bl oc k Thermostat-Cooling Thermostat-Heating Transformer

Field Splice

Marked Wire

Terminal (Marked)

Terminal (Unmarked)

Te r m ina l Bl oc k

Splice

Spliced (Marked)

Factory Wiring

Field Control Wiring

Field Power Wiring

Accessory or Optional Wiring

To indicate common potential only, not to represent wiring.

Fig. 46 — Typical Wiring Diagram (cont)

START-UP CHECKLIST

(Remove and Store in Job File)

I. PRELIMINARY INFORMATION

MODEL NO.:_______________________________________ DATE: _____________________________________________ UNIT NO.: _________________________________________

SERIAL NO. ___________________________________________ TECHNICIAN: _________________________________________ JOB LOCATION: ____________________ ___________________ JOB NAME:____________________________________________

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



VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTALLATION INSTRUCTIONS



CHECK ALL ELECTRICAL CONNECTIONS AND TERMINALS FOR TIGHTNESS



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



VERIFY THAT UNIT INSTALLATION IS LEVEL



CHECK FAN WHEEL AND PROPELLER FOR LOCATION IN HOUSING/ORIFICE AND SETSCREW TIGHTNESS



CHECK PULLEY ALIGNMENT AND BELT TENSION PER INSTALLATION INSTRUCTIONS



ENSURE BELT TENSION AND BLOWER PULLEYS ARE PROPERLY ALIGNED

III. START-UP

ELECTRICAL

CUT ALONG DOTTED LINE

SUPPLY VOLTAGE L1-L2 L2-L3 L3-L1 CIRCUIT NO. 1 COMPRESSOR AMPS L1 L2 L3 CIRCUIT NO. 2 COMPRESSOR AMPS L1 L2 L3 INDOOR FAN AMPS L1 L2 L3

TEMPERATURES

OUTDOOR-AIR TEMPERATURE DB (dry bulb) RETURN-AIR TEMPERATURE DB WB (wet bulb) COOLING SUPPLY AIR DB WB

PRESSURES (Cooling Mode)

REFRIGERANT SUCTION, CIRCUIT 1 PSIG ° F REFRIGERANT SUCTION, CIRCUIT 2 PSIG ° F REFRIGERANT DISCHARGE, CIRCUIT 1 PSIG ° F REFRIGERANT DISCHARGE, CIRCUIT 2 PSIG ° F



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



VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS ON PAGES 32 AND 33.

CUT ALONG DOTTED LINE

CL-1

CATALOG NO. 5354-805

Bryant 548D User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual