Bryant DURAPAC 579F Dimensions and installation guide

Cancels: II 579F-180-7 II 579F-180-8
3/15/06
installation, start-up and
service instructions
SINGLE PACKAGE ROOFTOP
GAS HEATING/ELECTRIC COOLING UNITS
579F
Dura Pac Series
Sizes 180-300
15 to 25 Tons
CONTENTS Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-22
I. Step 1 — Provide Unit Support. . . . . . . . . . . . . . . . . 1
II. Step 2 — Rig and Place Unit. . . . . . . . . . . . . . . . . . . 3
III. Step 3 — Field Fabricate Ductwork . . . . . . . . . . . . . 8
IV. Step 4 — Make Unit Duct Connections . . . . . . . . . . 8
V. Step 5 — Install Flue Hood and Wind Baffle . . . . . . 8
VI. Step 6 — Trap Condensate Drain . . . . . . . . . . . . . . . 8
VII. Step 7 — Orifice Change. . . . . . . . . . . . . . . . . . . . . . 9
VIII. Step 8 — Install Gas Piping . . . . . . . . . . . . . . . . . . 10
IX. Step 9 — Make Electrical Connections . . . . . . . . . 10
X. Step 10 — Make Outdoor-Air Inlet
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
XI. Step 11 — Install Outdoor-Air Hood. . . . . . . . . . . . 11
XII. Step 12 — Install All Accessories . . . . . . . . . . . . . 13
XIII. Step 13 — Adjust Factory-Installed Options. . . . . 14
XIV. Step 14 — Install Humidistat for Optional
Perfect Humidity™ Dehumidification Package . . . 21
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22-28
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28-37
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . .38-42
INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . CL-1
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can
be hazardous due to system pressure and electrical compo-
nents. Only trained and qualified service personnel should
install, repair, or service air-conditioning equipment.
Untrained personnel can perform basic maintenance functions
of cleaning coils and filters and replacing filters. All other oper-
ations should be performed by trained service personnel. When
working on air-conditioning equipment, observe precautions in
the literature, tags and labels attached to the unit, and other
safety precautions that may apply.
Follow all safety codes. Wear safety glasses and work gloves.
Use quenching cloth for unbrazing operations. Have fire
extinguishers available for all brazing operations.
IMPORTANT: Units have high ambient operating limits. If
limits are exceeded, the units will automatically lock the com-
pressor out of operation. Manual reset will be required to
restart the compressor.
INSTALLATION
I. STEP 1 — PROVIDE UNIT SUPPORT
A. Roof Curb
Assemble and install accessory roof curb or horizontal
adapter roof curb in accordance with instructions shipped
with this accessory. See Fig. 1 and 2. Install insulation, cant
strips, roofing, and counter flashing as shown. Ductwork can
be installed to roof curb or horizontal adapter roof curb before
unit is set in place. Curb or adapter roof curb should be level.
This is necessary to permit unit drain to function properly.
Unit leveling tolerance is ± 1/16 in. per linear ft in any direc-
tion. Refer to Accessory Roof Curb or Horizontal Adapter Roof
Curb Installation Instructions for additional information as
required. When accessory roof curb or horizontal adapter roof
curb is used, unit may be installed on class A, B, or C roof cov-
ering material.
WARNING: Before performing service or mainte-
nance operations on unit, turn off main power switch
to unit and install lockout tag on disconnect switch.
Electrical shock could cause personal injury.
WARNING:
1. Improper installation, adjustment, alteration,
service, or maintenance can cause property dam-
age, personal injury, or loss of life. Refer to the
User’s Information Manual provided with this
unit for more details.
2. Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any
other appliance.
What to do if you smell gas:
1. DO NOT try to light any appliance.
2. DO NOT touch any electrical switch, or use any
phone in your building.
3. IMMEDIATELY call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
4. If you cannot reach your gas supplier, call the
fire department.
WARNING: Disconnect gas piping from unit when
pressure testing at pressure greater than 0.5 psig.
Pressures greater than 0.5 psig will cause gas valve
damage resulting in hazardous condition. If gas valve is
subjected to pressure greater than 0.5 psig, it must be
replaced before use. When pressure testing field-
supplied gas piping at pressures of 0.5 psig or less, a
unit connected to such piping must be isolated by clos-
ing the manual gas valve(s).

—2—
Fig. 1 — Roof Curb Details
PKG. NO. REF. CURB
HEIGHT DESCRIPTION
CRRFCURB010A00 1′− 2″(305) Standard Curb 14″High CRRFCURB011A00 2′-0″(610) Standard Curb for Units Requiring High Installation CRRFCURB012A00 2′-0″(610) Side Supply and Return Curb for High Installation

—3—
IMPORTANT: The gasketing of the unit to the roof curb or
adapter roof curb is critical for a watertight seal. Install gas-
ket with the roof curb or adapter as shown in Fig. 1. Improp-
erly applied gasket can also result in air leaks and poor unit
performance.
B. Alternate Unit Support
When the curb or adapter cannot be used, install unit on a
noncombustible surface. Support unit with sleepers, using
unit curb support area. If sleepers cannot be used, support
long sides of unit with a minimum of 3 equally spaced 4-in. x
4-in. pads on each side.
II. STEP 2 — RIG AND PLACE UNIT
Inspect unit for transportation damage. File any claim with
transportation agency.
Do not drop unit; keep upright. Use spreader bars over unit
to prevent sling or cable damage. Rollers may be used to
move unit across a roof. Level by using unit frame as a refer-
ence; leveling tolerance is ± 1/16 in. per linear ft in any direc-
tion. See Fig. 3 for additional information. Unit operating
weight is shown in Table 1.
Four lifting holes are provided in ends of unit base rails as
shown in Fig. 3. Refer to rigging instructions on unit.
A. Positioning
Maintain clearance, per Fig. 4 and 5, around and above unit
to provide minimum distance from combustible materials,
proper airflow, and service access.
Do not install unit in an indoor location. Do not locate unit
air inlets near exhaust vents or other sources of contami-
nated air. For proper unit operation, adequate combustion
and ventilation air must be provided in accordance with Sec-
tion 5.3 (Air for Combustion and Ventilation) of the National
Fuel Gas Code, ANSI Z223.1 (American National Standards
Institute).
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
Locate mechanical draft system flue assembly at least 4 ft
from any opening through which combustion products could
enter the building, and at least 4 ft from any adjacent build-
ing. When unit is located adjacent to public walkways, flue
assembly must be at least 7 ft above grade.
B. Roof Mount
Check building codes for weight distribution requirements.
Unit operating weight is shown in Table 1.
Instructions continued on page 8.
NOTE: CRRFCURB013A00 is a fully factory preassembled horizontal
adapter and includes an insulated transition duct. The pressure drop
through the adapter curb is negligible.
For horizontal return applications: The power exhaust and barometric
relief dampers must be installed in the return air duct.
23"
14 3/4"
6"
3 1/2"
FULLY INSULATED
SUPPLY PLENUM
1" INSULATION
1 1/2 # DENSITY,
STICK PINNED & GLUED
2" X 1/4
SUPPORT TYP.
STITCH WELDED
12" WIDE STANDING
SEAM PANELS
ACCESSORY
PACKAGE NO.
CURB
HEIGHT DESCRIPTION
CRRFCURB013A00 1′-11″
(584)
Pre-Assembled, Roof Curb,
Horizontal Adapter
Fig. 2 — Horizontal Supply/Return Adapter Installation (579F180-240)

—4—
NOTES:
1. Dimensions in ( ) are in millimeters.
2. Refer to Fig. 4 and 5 for unit operating weights.
3. Remove boards at ends of unit and runners prior to rigging.
4. Rig by inserting hooks into unit base rails as shown. Use corner post
from packaging to protect coil from damage. Use bumper boards for
spreader bars on all units.
5. Weights do not include optional EconoMi$erIV. Add 90 lb (41 kg) for
EconoMi$erIV weight.
6. Weights given are for aluminum evaporator and condenser coil plate
fins.
CAUTION: All panels must be in place when rigging
Fig. 3 — Rigging Details
UNIT
579F
MAXIMUM
SHIPPING WEIGHT
DIMENSIONS
AB
lb kg Ft-in. mm Ft-in. mm
180 1775 805 6-111/22121 3-5 1041
216 1875 850 6-111/22121 3-3 991
240 1985 900 6-111/22121 3-2 965
300 2135 968 6-111/22121 3-2 965

—5—
NOTES: 1. Refer to print for roof curb accessory dimensions. 2. Dimensions in ( ) are in millimeters. 3. Center of Gravity. 4. Direction of airflow. 5. Ductwork to be attached to accessory roof curb only. 6. Minimum clearance:
•Rear:7′-0″(2134) for coil removal. This dimension can be reduced to
4′-0″(1219) if conditions permit coil removal from the top.
•4′-0″(1219) to combustible surfaces, all four sides (includes between
units).
• Left side: 4′-0″(1219) for proper condenser coil airflow.
• Front: 4′-0″(1219) for control box access.
• Right side: 4′-0″(1219) for proper operation of damper and power
exhaust if so equipped.
•Top:6′-0″(1829) to assure proper condenser fan operation. • Bottom: 14″(356) to combustible surfaces (when not using curb). • Control box side: 3′-0″(914) to ungrounded surfaces, non-combustible. • Control box side: 3′-6″(1067) to block or concrete walls, or other
grounded surfaces.
• Local codes or jurisdiction may prevail.
7. With the exception of clearance for the condenser coil and the damper/
power exhaust as stated in Note #6, a removable fence or barricade requires no clearance.
8. Dimensions are from outside of corner post. Allow 0′-5/16″(8) on each side
for top cover drip edge.
Fig. 4 — Base Unit Dimensions; 579F180,216
UNIT
STD UNIT
WEIGHT
ECONOMI$ERIV
WEIGHT
CORNER
A
CORNER
B
CORNER
C
CORNER
DDIM A DIM B DIM C
lb kg lb kg lb kg lb kg lb kg lb kg ft-in. mm ft-in. mm ft-in. mm
579F180 1650 748 90 41 423 192 386 175 403 183 438 199 3-5 1041 3-5 1041 1-10 559 579F216 1800 816 90 41 432 196 410 186 461 209 472 214 3-3 991 3-7 1092 1- 8 508

—6—
NOTES: 1. Refer to print for roof curb accessory dimensions. 2. Dimensions in ( ) are in millimeters. 3. Center of Gravity. 4. Direction of airflow. 5. Ductwork to be attached to accessory roof curb only. 6. Minimum clearance:
• Rear: 7′-0″(2134) for coil removal. This dimension can be reduced to
4′-0″(1219) if conditions permit coil removal from the top.
•4′-0″(1219) to combustible surfaces, all four sides (includes between
units).
• Left side: 4′-0″(1219) for proper condenser coil airflow.
• Front: 4′-0″(1219) for control box access.
• Right side: 4′-0″(1219) for proper operation of damper and power
exhaust if so equipped.
•Top:6′-0″(1829) to assure proper condenser fan operation.
• Bottom: 14″(356) to combustible surfaces (when not using curb). • Control box side: 3′-0″(914) to ungrounded surfaces, non-combustible. • Control box side: 3′-6″(1067) to block or concrete walls, or other
grounded surfaces.
• Local codes or jurisdiction may prevail.
7. With the exception of clearance for the condenser coil and the damper/
power exhaust as stated in Note #6, a removable fence or barricade requires no clearance.
8. Dimensions are from outside of corner post. Allow 0′-5/16″(8) on each
side for top cover drip edge.
Fig. 5 — Base Unit Dimensions; 579F240,300
UNIT
STD UNIT
WEIGHT
ECONOMI$ERIV
WEIGHT
CORNER
A
CORNER
B
CORNER
C
CORNER
DDIM A DIM B DIM C
lb kg lb kg lb kg lb kg lb kg lb kg ft-in. mm ft-in. mm ft-in. mm
579F240 1850 839 90 41 443 201 406 184 476 216 525 238 3-2 965 3-5 1041 1-8 508 579F300 2000 907 90 41 471 214 428 194 526 239 574 260 3-2 965 3-5 1041 1-8 508

—7—
Table 1 — Physical Data
LEGEND
*Circuit 1 uses the lower portion of condenser coil and lower portion of evaporator coils;
and Circuit 2 uses the upper portion of both coils.
†Rollout switch is manual reset.
**The 579F300 units requires 2-in. industrial-grade filters capable of handling face veloc-
ities of up to 625 ft/min (such as American Air Filter no. 5700 or equivalent).
NOTE: The 579F180-300 units have a low-pressure switch (standard) located on the
suction side.
UNIT 579F 180 216 240 300
NOMINAL CAPACITY (tons) 15 18 20 25
OPERATING WEIGHT (lb) 1650 1800 1850 2000
EconoMi$erIV 90 90 90 90
Roof Curb 200 200 200 200
COMPRESSOR/MANUFACTURER Scroll, Copeland
Quantity...Model (Ckt 1, Ckt 2) 2...SR*942AE 1...SM120
1...SR*782*AE
1...SM120
1...SM110
1...SM161
1...SM120
Number of Refrigerant Circuits 2222
Stages of Capacity Control (%) 50/50 60/40 52/48 56/44
Oil (oz) (Ckt 1, Ckt 2) 90, 90 110, 72 110, 110 112, 110
REFRIGERANT TYPE R-22
Expansion Device TXV
Operating Charge (lb-oz)
Circuit 1* 10-13 15-2 16-3 21-0
Circuit 2 10- 5 11-5 14-8 15-4
CONDENSER COIL Cross-Hatched 3/8-in. Copper Tubes, Aluminum Lanced,
Aluminum Pre-Coated, or Copper Plate Fins
Rows...Fins/in. 2...17 3...15 3...15 4...15
Total Face Area (sq ft) 21.7 21.7 21.7 21.7
CONDENSER FAN Propeller Type
Nominal Cfm 10,500 9250 13,650 12,500
Quantity...Diameter (in.) 3...22 3...22 2...30 2...30
Motor Hp...Rpm 1/2...1050 1/2...1050 1...1075 1...1075
Watts Input (Total) 1100 1100 3400 3400
EVAPORATOR COIL Cross-Hatched 3/8-in. Copper Tubes, Aluminum Lanced or Copper Plate Fins, Face Split
Rows...Fins/in. 2...17 3...15 3...15 4...15
Total Face Area (sq ft) 17.5 17.5 17.5 17.5
EVAPORATOR FAN Centrifugal Type
Quantity...Size (in.) 2...10 x 10 2...12 x 12 2...12 x 12 2...12 x 12
Type Drive Belt Belt Belt Belt
Nominal Cfm 6000 7200 8000 10,000
Motor Hp 3.7 5 7.5 10
Motor Nominal Rpm 1725 1745 1745 1740
Maximum Continuous Bhp 4.25 5.90 8.7 [208/230 v]
9.5 [460 v]
10.2 [208/230 v]
11.8 [460 v]
Motor Frame Size 56H 184T 213T 215T
Fan Rpm Range Low-Medium Static 891-1179 910-1095 1002-1225 1066-1283
High Static 1227-1550 1069-1287 1193-1458 1332-1550
Motor Bearing Type Ball Ball Ball Ball
Maximum Allowable Rpm 1550 1550 1550 1550
Motor Pulley Pitch Diameter Low-Medium Static 3.1/4.1 4.9/5.9 5.4/6.6 4.9/5.9
Min/Max (in.) High Static 3.7/4.7 4.9/5.9 5.4/6.6 4.9/5.9
Nominal Motor Shaft Diameter (in.) 7/811/813/813/8
Fan Pulley Pitch Diameter (in.) Low-Medium Static 6.0 9.4 9.4 8.0
High Static 5.2 8.0 7.9 6.4
Nominal Fan Shaft Diameter (in.) 13/16 17/16 17/16 17/16
Belt, Quantity...Type...Length (in.) Low-Medium Static 1...BX...42 1...BX...50 1...BX...54 2...BX...50
High Static 1...BX...42 1...BX...48 1...BX...50 2...BX...47
Pulley Center Line Distance (in.) 13.5-15.5 13.3-14.8 14.6-15.4 14.6-15.4
Speed Change per Full Turn of
Movable Pulley Flange (rpm)
Low-Medium Static 48 37 37 36
High Static 55 34 44 45
Movable Pulley Maximum Full Turns
From Closed Position 6666
Factory Speed Pulley Setting 3.5 3.5 3.5 3.5
Factory Speed Setting (rpm) Low-Medium Static 1035 1002 1120 1182
High Static 1389 1178 1328 1470
FURNACE SECTION (Low Heat/High Heat)
Rollout Switch Cutout Temp (F)† 190 190 190 190
Burner Orifice Diameter (in. ...drill size)
Natural Gas 0.1285...30/
0.136...29
0.1285...30/
0.136...29
0.1285...30/
0.136...29
0.1285...30/
0.136...29
Thermostat Heat Anticipator Setting (amps)
208/230 v Stage 1 0.98 0.98 0.98 0.98
Stage 2 0.44 0.44 0.44 0.44
460 v Stage 1 0.80 0.80 0.80 0.80
Stage 2 0.44 0.44 0.44 0.44
Gas Input Stage 1 206,000/270,000 206,000/270,000 206,000/270,000 206,000/270,000
Stage 2 275,000/360,000 275,000/360,000 275,000/360,000 275,000/360,000
Efficiency (Steady State) (%) 81 81 81 81
Temperature Rise Range 15-45/20-50 15-45/20-50 15-45/20-50 15-45/20-50
Manifold Pressure (in. wg)
Natural Gas 3.3 3.3 3.3 3.3
Gas Valve Quantity 1111
Field Gas Connection Size (in.-FPT) 3/43/43/43/4
HIGH-PRESSURE SWITCH (psig)
Cutout 426
Reset (Auto) 320
LOW-PRESSURE SWITCH (psig)
Cutout 27
Reset (Auto) 44
FREEZE PROTECTION THERMOSTAT (F)
Opens 30 ±5
Closes 45 ±5
OUTDOOR-AIR INLET SCREENS Cleanable
Quantity...Size (in.) 2...20 x 25 x 1
1...20 x 20 x 1
RETURN-AIR FILTERS Throwaway**
Quantity...Size (in.) 4...20 x 20 x 2
4...16 x 20 x 2
POWER EXHAUST 1/2Hp, 208/230-460 v Motor Direct Drive, Propeller-Fan (Factory-Wired for 460 v)
Bhp — Brake Horsepower
TXV — Thermostatic Expansion Valve

—8—
III. STEP 3 — FIELD FABRICATE DUCTWORK
Secure all ducts to building structure. Use flexible duct con-
nectors between unit and ducts as required. Insulate and
weatherproof all external ductwork, joints, and roof openings
with counter flashing and mastic in accordance with applica-
ble codes.
Ducts passing through an unconditioned space must be insu-
lated and covered with a vapor barrier.
IV. STEP 4 — MAKE UNIT DUCT CONNECTIONS
Unit is shipped for thru-the-bottom duct connections. Duct-
work openings are shown in Fig. 1, 4, and 5. Duct connec-
tions are shown in Fig. 6. Field-fabricated concentric
ductwork may be connected as shown in Fig. 7 and 8. Attach
all ductwork to roof curb and roof curb basepans.
V. STEP 5 — INSTALL FLUE HOOD AND WIND BAFFLE
Flue hood and wind baffle are shipped secured under main
control box. To install, secure flue hood to access panel. See
Fig. 9. The wind baffle is then installed over the flue hood.
NOTE: When properly installed, flue hood will line up with
combustion fan housing. See Fig. 10.
VI. STEP 6 — TRAP CONDENSATE DRAIN
See Fig. 11 for drain location. One 3/4-in. half coupling is pro-
vided inside unit evaporator section for condensate drain
connection. An 81/2-in. x 3/4-in. diameter and 2-in. x 3/4-in.
diameter pipe nipple, coupled to standard 3/4-in. diameter
elbows, provide a straight path down through hole in unit
base rails (see Fig. 12). A trap at least 4-in. deep must be
used.
NOTE: Do not drill in this area; damage to basepan may result in water
leak.
Fig. 6 — Air Distribution — Thru-the-Bottom
NOTE: Do not drill in this area; damage to basepan may result in water
leak.
Fig. 7 — Concentric Duct Air Distribution
NOTE: Dimensions A, A′, and B′are obtained from field-supplied ceil-
ing diffuser.
Shaded area indicates block-off panels.
Fig. 8 — Concentric Duct Details
WIND
BAFFLE
Fig. 9 — Flue Hood Location

—9—
VII. STEP 7 — ORIFICE CHANGE
This unit is factory assembled for heating operation using
natural gas at an elevation from sea level to 2000 ft. This
unit uses orifice type LH32RFnnn, where “nnn” indicates the
orifice size based on drill size diameter in thousands of an
inch.
A. High Elevation (Above 2000 ft)
Use accessory high altitude kit when installing this unit at
an elevation of 2000 to 7000 ft. For elevations above 7000 ft,
refer to Table 2 to identify the correct orifice size for the
elevation. See Table 3 for the number of orifices required for
each unit size. Purchase these orifices from your local Bryant
dealer. Follow instructions in accessory Installation Instruc-
tions to install the correct orifices.
Table 2 — Altitude Compensation*
*As the height above sea level increases, there is less oxygen per cubic
foot of air. Therefore, heat input rate should be reduced at higher alti-
tudes. Includes a 4% input reduction per each 1000 ft.
†Orifices available through your Bryant dealer.
Table 3 — Orifice Quantity
B. Conversion To LP (Liquid Propane) Gas
Use accessory LP gas conversion kit when converting this unit
for use with LP fuel usage for elevations up to 7000 ft. For
elevations above 7000 ft, refer to Table 4 to identify the correct
orifice size for the elevation. See Table 3 for the number of
orifices required for each unit size. Purchase these orifices
from your local Bryant dealer. Follow instructions in accessory
Installation Instructions to install the correct orifices.
Table 4 — LP Gas Conversion*
*As the height above sea level increases, there is less oxygen per
cubic foot of air. Therefore, heat input rate should be reduced at higher
altitudes. Includes a 4% input reduction per each 1000 ft.
†Orifices available through your Bryant dealer.
ELEVATION (ft) NATURAL GAS ORIFICE†
Low Heat High Heat
0-1,999 30 29
2,000 30 29
3,000 31 30
4,000 31 30
5,000 31 30
6,000 31 30
7,000 32 31
8,000 32 31
9,000 33 31
10,000 35 32
UNIT ORIFICE QUANTITY
579F180 Low Heat 5
579F210 Low Heat,
579F240 Low Heat,
579F300 Low Heat,
579F180 High Heat
6
579F210 High Heat,
579F240 High Heat,
579F300 High Heat
7
ELEVATION (ft) LP GAS ORIFICE†
0-1,999 36
2,000 37
3,000 38
4,000 38
5,000 39
6,000 40
7,000 41
8,000 41
9,000 42
10,000 43
INDUCED DRAFT
MOTOR
MAIN BURNER
SECTION
COMBUSTION
FAN HOUSING
HEAT EXCHANGER
SECTION
Fig. 10 — Combustion Fan Housing Location
3/4" FPT DRAIN
CONNECTION
1-3/8"
DRAIN HOLE
Fig. 11 — Condensate Drain Details (579F180 Shown)
Fig. 12 — Condensate Drain Piping Details

—10—
VIII. STEP 8 — INSTALL GAS PIPING
Unit is equipped for use with natural gas. Installation must
conform with local building codes or, in the absence of local
codes, with the National Fuel Gas Code, ANSI Z223.1.
Install field-supplied manual gas shutoff valve with a
1/8-in. NPT pressure tap for test gage connection at unit.
Field gas piping must include sediment trap and union. See
Fig. 13.
IMPORTANT: Natural gas pressure at unit gas connection
must not be less than 5.5 in. wg or greater than 13.5 in. wg.
Size gas-supply piping for 0.5-in. wg maximum pressure
drop. Do not use supply pipe smaller than unit gas
connection.
IX. STEP 9 — MAKE ELECTRICAL CONNECTIONS
A. Field Power Supply
Unit is factory wired for voltage shown on nameplate.
When installing units, provide a disconnect per NEC
(National Electrical Code) of adequate size (see Table 5).
All field wiring must comply with NEC and local
requirements.
Route power ground lines through control box end panel or
unit basepan (see Fig. 4 and 5) to connections as shown on
unit wiring diagram and Fig. 14.
Field wiring must confirm to temperature limitations for
type “T” wire. All field wiring must comply with NEC and
local requirements.
Transformer no. 1 is wired for 230-v unit. If 208/230-v unit is
to be run with 208-v power supply, the transformer must be
rewired as follows:
1. Remove cap from red (208 v) wire.
2. Remove cap from orange (230 v) spliced wire.
3. Replace orange wire with red wire.
4. Recap both wires.
IMPORTANT: BE CERTAIN UNUSED WIRES ARE
CAPPED. Failure to do so may damage the transformers.
Operating voltage to compressor must be within voltage
range indicated on unit nameplate. On 3-phase units, volt-
ages between phases must be balanced within 2%.
Unit failure as a result of operation on improper line voltage
or excessive phase imbalance constitutes abuse and may
cause damage to electrical components.
B. Field Control Wiring
Install a Bryant-approved accessory thermostat assembly
according to installation instructions included with acces-
sory. Locate thermostat assembly on a solid interior wall in
the conditioned space to sense average temperature.
Route thermostat cable or equivalent single leads of
colored wire from subbase terminals through conduit in unit
to low-voltage connections as shown on unit label wiring dia-
gram and in Fig. 15.
NOTE: For wire runs up to 50 ft, use no. 18 AWG (American
Wire Gage) insulated wire (35 C minimum). For 50 to 75 ft,
use no. 16 AWG insulated wire (35 C minimum). For over
75 ft, use no. 14 AWG insulated wire (35 C minimum). All
wire larger than no. 18 AWG cannot be directly connected at
the thermostat and will require a junction box and splice at
the thermostat.
Set heat anticipator settings as follows:
Settings may be changed slightly to provide a greater degree
of comfort for a particular installation.
C. Optional Non-Fused Disconnect
On units with the optional non-fused disconnect, incoming
power will be wired into the disconnect switch. Refer to
Fig. 16 for wiring for 100 and 200 amp disconnect switches.
Units with an MOCP (maximum overcurrent protection)
under 100 will use the 100 amp disconnect switch. Units
with an MOCP over 100 will use the 200 amp disconnect
switch. Refer to the applicable disconnect wiring diagram.
To prevent breakage during shipping, the disconnect handle
and shaft are shipped and packaged inside the unit control
box. Install the disconnect handle before unit operation.
To install the handle and shaft, perform the following
procedure:
1. Open the control box door and remove the handle and
shaft from shipping location.
2. Loosen the Allen bolt located on the disconnect
switch. The bolt is located on the square hole and is
used to hold the shaft in place. The shaft cannot be
inserted until the Allen bolt is moved.
3. Insert the disconnect shaft into the square hole on
the disconnect switch. The end of the shaft is spe-
cially cut and the shaft can only be inserted in the
correct orientation.
4. Tighten the Allen bolt to lock the shaft into position.
5. Close the control box door.
6. Attach the handle to the external access door with
the two screws provided. When the handle is in the
ON position, the handle will be vertical. When
the handle is in the OFF position, the handle will be
horizontal.
WARNING: Do not pressure test gas supply while
connected to unit. Always disconnect union before
servicing.
CAUTION: The correct power phasing is critical in
the operation of the scroll compressors. An incorrect
phasing will cause the compressor to rotate in the
wrong direction. This may lead to premature compres-
sor failure.
WARNING: The unit must be electrically
grounded in accordance with local codes and NEC
ANSI/NFPA 70 (National Fire Protection Association).
VOLTAGE W1 W2
208/230
460
0.98
0.80
0.44
0.44
Fig. 13 — Field Gas Piping