Bryant 581A User Manual
installation, start-up and
service instructions
SINGLE PA CKA GE RO OFT OP
ELECTRIC COOLING/GAS HEATING UNITS
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . .1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
I. Step 1 — Provide Unit Support. . . . . . . . . . . . . .1
II. Step 2 — Rig and Place Unit . . . . . . . . . . . . . . . .3
III. Step 3 — Field Fabricate Ductwork. . . . . . . . . . .7
IV. Step 4 — Make Unit Duct Connections . . . . . . .7
V. Step 5 — Install Flue Hood and Wind
Baffle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
VI. Step 6 — Trap Condensate Drain . . . . . . . . . . . .8
VII. Step 7 — Install Gas Piping. . . . . . . . . . . . . . . . .8
VIII. Step 8 — Make Electrical Connections . . . . . . .8
IX. Step 9 — Make Outdoor-Air Inl et
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
X. Step 10 — Install Outdoor -Air Hood . . . . . . . . .11
XI. Step 11 — Install All Accessories. . . . . . . . . . .13
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-25
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25-34
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . 35-37
START-UP CHECKLIST. . . . . . . . . . . . . . . . . . . . . . . .CL-1
Page
581A
Sizes 155-240
Cancels: II 581A-155-2 II 581A-155-3
6/15/99
WARNING:
1. Improper installation, adjustment, alteration,
service, or maintenance can cause property
damage, personal injury, or loss of life. Refer to
the User’s Information Manual provided with
this unit for more details.
2. Do not store or use gasoline or other flammable
vapor s and l iq uids in t he vici nity of this or a ny
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 buildi ng.
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.
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can
be hazardous due to system pressure and electrical components. Only trained and qualified service personnel should
install, repair, or service air-conditioning equipment.
Untrained personnel can perform the basic maintenance
functions of cleaning coils and filters and replacing filters.
All ot he r oper ati ons s hou ld be pe rfor med by tr ain ed se rvi ce
personnel. When working on air-conditioning equipment,
observe precautions in the literature, tags and labels
attached to the unit, and other safety precautions that may
apply.
Follow all sa fe ty codes. Wear safet y gl a sse s an d w o rk g lov e s.
Use quenching cloth for unbrazing operations. Have fire
extinguishers available for all brazing operations.
WARNING: Before performing service or maintenance operations on unit, turn off mail power s wi tch to
unit. electrical shock cou l d cause personal inju ry.
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 fieldsupplied gas piping at pre ssures of 0.5 ps ig or less, a
unit connected to such piping must be isolated by closing the manual gas valve(s).
IMPORTANT: Units have high ambient operating limits. If
limits are exceeded, the units will automatically lock the
compressor out of operation. Manual res et will be required to
resta r t th e compre ss o r.
INSTALLATION
I. STEP 1 — PROVIDE UNIT SUPPORT
A. Roof Curb
Assemble or install accessory roof curb or horizontal supply
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 supply roof curb before
unit is set in place.
(Instructions continued on page 3.)
—2—
PKG. NO. REF.
CRRFCURB010A00
CRRFCURB011A00
CRRFCURB012A00
CURB
HEIGHT
ft-in. (mm)
1-2
(305)
2-0
(610)
2-0
(610)
DESCRIPTION
Standard Curb
14” High
Standard Curb
for Units
Requiring High
Installation
Side Supply
and Return
Curb for High
Installation
NOTES:
1. Roof curb accessory is shipped disassembled.
2. Insulated panels: 1 in. thick neoprene coated 1
3. Dimensions in ( ) are in millimeters.
1
/2 lb density.
4. Direction of airflow.
5. Roof curb: 16 ga. (VA03-56) stl.
To pre vent the hazard of stagnant water build-up in the drain
NOTE:
pan of the indoor section, unit can only be pitched as shown.
Dimensions (degrees and inches)
UNIT
ALL
AB
DEG.IN.DEG.IN.
.28 .45 .28 .43
Fig. 1 — Roof Curb Details
For preassembled horizontal adapter roof curb part no.
NOTE:
(CRRFCURB013A00), the accessor y kit includes a factory-designed,
high-static, regain transition duct. For horizontal curb part no.
CRRFCURB012A00, a field-supplied transition duct is required.
Fig. 2 — Horizontal Adapter Roof Curbs
and Roof Curbs
IMPORTANT: Curb or adapt er roof cur b must be lev el. Th is is
necessary to per mit unit drain to function properly. Unit leveling tolerance is ±
1
/16 in. per linear ft in any direction. Refer
to Accessory Roof Curb or Horizontal Supply Roof Curb
Installation Instructions for additional information as
required.
When accessory roof curb or horizontal supply roof curb is
used, unit may be installed on class A, B, or C roof covering
material.
IMPORTANT: The gasketing of the unit to the roof curb or
adapter roof curb is critical for a watertight seal. Install gasket with the roof curb or adapter as shown in Fig. 1. Improperly applied gasket can also result in air leaks and poor unit
performance.
B. Alternate Unit Support
When a 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
tran sportat i on agency.
Do not drop unit; keep upright. Spreader bars are not
required if top crating is left on unit. Use spreader bars over
unit to prev ent sling or cabl e damage. Rollers may be used to
move unit across a roof. Level by usi n g unit frame as a reference; lev eling toler a n ce is ±
1
/16 in. per linear ft in any direction. 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 ri ggi ng inst ruct ions 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 air
inlets near exhaust vents or other sources of contaminated
air. For proper unit operation, ade quate combustion a nd ventilation air must be provided in accordance with Section 5.3
(Air for Combustion and Ventilation) of the National Fuel
Gas Code, ANSI Z223.1 (American National Standards
Institute) .
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
Locate mechanical draft system flue assembly at least 4 ft
from any opening through which combustion products could
enter the building, and at least 4 ft from any adjacent building. When unit is located adjacent to public walkways, flue
assembly must be at leas t 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.
UNIT
581A
155
180
240
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 inser ting hook s in to uni t ba se rails as show n. Use c or n er pos t from
packaging to protect coil from damag e. Use bumper boards for spreader
bars on all units.
5. Weights do not include opti onal economi zer. Add 110 lb (50 kg) for econo mizer weight.
6. Weights given are for aluminum evaporator and condenser coil plate fins.
7. Add 75 lb (34 kg) for crating on 581A155 and 180 units. Add 135 lb (61 kg)
for crating on 581A240 units.
8. Add 150 lb (68 kg) for copper condens er coi l. Add 280 lb (127 kg ) for
copper condenser and evaporator coils.
CAUTION:
MAXIMUM SHIPPING
WEIGHT
lb kg ft-in. mm ft-in. mm
1725 782 6-11
1800 816 6-11
1900 862 6-11
AB
1
/
2
1
/
2
1
/
2
All panels must be in place when rigging.
DIMENSIONS
2121 4-0 1219
2121 3-2 964
2121 3-4 1016
Fig. 3 — Rigging Details
—3—
—4—
STD UNIT
UNIT
WEIGHT
581A
Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg ft-in. mm ft-in. mm ft-in. mm
155 1725 782 110 50 427 194 390 177 438 199 470 213 3-3 991 3-5 1051 1-10 559
180 1800 816 110 50 417 189 399 181 481 218 503 228 3-2 961 3-6 1070 1-10 559
ECONO-
MIZER
WEIGHT
CORNERACORNERBCORNERCCORNER
NOTES:
1. Refer to print for roof curb accessory dimensions.
2. Dimensions in ( ) are in millimeters.
D
DIM A DIM B DIM C
3. Center of Gravity.
4. Direction of airflow.
5. Ductwork to be attached to accessory roof curb only.
6. Minimum clearance:
• Rear: 7 ft- 0 in. (2134) for coil removal. This dim ension can be reduced
to 4 ft-0 in. (1219) if conditions permit coil removal from the top.
• 4 ft-0 in. (1219) to combustible surfaces, all four sides (includes between
units).
• Left side: 4 ft-0 in.(1219) for proper condenser coil airflow.
• Front: 4 ft-0 in. (1219) for control box access.
• Right side: 4 ft-0 in. (1219) for proper operation of damper and power
exhaust if so equipped.
• Top: 6 ft-0 in. (1829) to assure proper condenser fan operation.
• Bottom: 14 in. (356) to combustible surfaces (when not using curb).
• Control box side: 3 ft-0 in. (914) to ungrounded surfaces, non-combustible.
• Control box side: 3 ft-6 in. (1067) to block or concrete walls, or other
grounded surfaces.
POWER EXHAUST/
BAROMETRIC RELIEF
(ACCESSORY ONLY)
• 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 no. 6, a removable fence or barricade
requires no clearance.
8. Dimensions are from outsi de of corner post. Allow 0 ft-
side for top cover drip edge.
5
/16 in. (8) on each
581A180 ONLY
Fig. 4 — Base Unit Dimensions; 581A155 and 180
POWER EXHAUST/
BAROMETRIC RELIEF
(ACCESSORY ONLY)
FIELD
SUPPLIED
—5—
UNIT STD. UNIT WEIGHT
581A240
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 ft-0 in. (2134) for coil removal. This dimensio n can be reduced to
4 ft-0 in. (1219) if conditions permit coil removal from the top.
• 4 ft-0 in. (1219) to combustible surfaces, all four sides (includes between
units).
• Left side: 4 ft-0 in.(1219) for proper condenser coil airflow.
• Front: 4 ft-0 in. (1219) for control box access.
• Right side: 4 ft-0 in. (1219) for proper operation of damper and power
exhaust if so equipped.
• Top: 6 ft-0 in. (1829) to assure proper condenser fan operation.
• Bottom: 14 in. (356) to combustible surfaces (when not using curb).
• Control box side: 3 ft-0 in. (914) to ungrounded surfaces, non-combustible.
• Control box side: 3 ft-6 in. (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 no. 6, a removable fence or barricade requires no
clearance.
8. Dimensions are fr om outside of cor ner post. Allow 0 ft -
side for top cover drip edge.
1900 lbs (862 kg) 110 lbs (50 kg)
ECONOMIZER
WEIGHT
5
/16 in. (8) on each
Fig. 5 — Base Unit Dimensions; 581A240
T able 1 — Physical Data
UNIT 581A 155 180 240
NOMINAL CAPACITY (tons)
OPERATING WEIGHT (lb)
Unit
Al/Al*
Al/Cu*
Cu/Cu*
Economizer
Roof Curb†
COMPRESSOR
Quantity
Number of Refrigerant Circuits
Crankcase Heater Watts
Oil (oz) (Ckt 1, Ckt 2)
REFRIGERANT TYPE
Expansion Device
Operating Charge (lb oz)
Circuit 1**
Circuit 2
CONDENSER COIL
Rows...Fins/in.
Total Face Area (sq ft)
CONDENSER FAN
Nominal Cfm
Quantity...Diameter (in.)
Motor Hp...Rpm
Watts Input (Total)
EVAPORATOR COIL
Rows...Fins/in.
Total Face Area (sq ft)
EVAPORATOR FAN
Quantity...Size (in.)
Type Drive
Nominal Cfm
Std Motor Hp
Opt Motor Hp
Motor Nominal Rpm
Std Maximum Continuous Bhp
Opt Maximum Continuous Bhp
Motor Frame Size
Fan Rpm Range Low-Medium Static
Motor Bearing Type
Maximum Allowable Rpm
Motor Pulley Pitch Dia. Low-Medium Static
Nominal Motor Shaft Diameter (in.)
Fan Pulley Pitch Diameter (in.) Low-Medium Static
Nominal Fan Shaft Diameter (in.)
Belt, Quantity...Type... Length (in.) Low-Medium Static
Pulley Center Line Distance (in.)
Speed Change per Full Turn of
Movable Pulley Flange (Rpm)
Movable Pulley Maximum
Full Turns From Closed Position
Factory Speed
Factory Speed Setting (Rpm) Low-Medium Static
FURNACE SECTION
Rollout Switch Cutout Temp (F) ll
Burner Orifice Diameter (in...drill size)
Natural Gas
Thermostat Heat Anticipator Setting
Stage 1 (amps)
Stage 2 (amps)
Gas Input (Btuh)Stage 1
Efficiency (Steady State) (%)
Temperature Rise Range
Manifold Pressure (in. wg)
Natural Gas
Gas Valve Quantity
GasValvePressure Range (in. wg)
Stage 2
(psig)
High Static
High Static
High Static
High Static
Low-Medium Static
High Static
High Static
0.98 0.8 0.98 0.8 0.98 0.8
0.44 0.44 0.44 0.44 0.44 0.44
Field Gas C onnection Size (in.-FPT)
HIGH-PRESSURE SWITCH (psig)
Cutout
Reset (Auto.)
LOW-PRESSURE SWITCH (psig)
Cutout
Reset (Auto.)
FREEZE PROTECTION THERMOSTAT (F)
Opens
Closes
OUTDOOR-AIR INLET SCREENS
Quantity...Size (in.)
RETURN-AIR FILTERS
Quantity...Size (in.)
LEGEND
Al —
Bhp —
Cu —
TXV —
Aluminum
Brake Horsepower
Copper
Thermostatic Expansion Valve
12 15 20
1725 1800 1900
1875 1950 2050
2005 2080 2180
110 110 110
200 200 200
22 2
22 2
70 70 70
60,66 85,60 110,110
20.7 19.5 18.5
11.9 13.45 13.3
Cross-Hatched
1
/2...1050
2...10 X 10 2...12 x 12 2...12 x 12
3
4...15 4...15 4...15
10,500 10,500 14,200
3...22 3...22 2...30
/8-in. Copper Tubes, Aluminum Lanced, Aluminum Pre-Coated, or Copper Plate Fins
21.7 21.7 21.7
1100 1100 3400
Cross-Hatched 3/8-in. Copper Tubes, Aluminum Lanced or Copper Plate Fins, Face Split
4...15 4...15 4...15
17.5 17.5 17.5
Belt Belt Belt
5200 6000 8000
2.9 5 7.5
3.7
1725 1745 1745
R-22
TXV
Propeller Type
1
/2...1050 1...1075
Centrifugal Type
3.13 6.13 9.47 (208 v)
4.38
56H 184T 213T
834-1064 873-1021 1002-1151
1161-1426 1025-1200 1193-1369
Ball Ball Ball
1550 1550 1550
3.1/4.1 4.9/5.9 5.4/6.6
3.7/4.7 4.9/5.9 5.4/6.6
7
/
8
6.0 9.4 9.4
5.2 8.0 7.9
3
1
/
16
1...BX...42 1...BX...50 1...BX...54
1...BX...42 1...BX...48 1...B X...50
13.5-15.5 13.3-14.8 14.6-15.4
11/
8
17/
16
58 37 37
67 44 44
4†† 4†† 4††
3.5 3.5 3.5
978 965 1095
1327 1134 1303
190 190 190
0.1285...30/ 0.136...29 0.1285...30/ 0.136...29 0.1285...30/ 0.136...29
172,000/230,000 206,000/275,000 206,000/275,000
225,000/300,000 270,000/360,000 270,000/360,000
81 81 81
15-45/30-60 15-45/20-50 15-45/20-50
3.3 3.3 3.3
11 1
5.5-13.5 5.5-13.5 5.5-13.5
.235-.487 .235-.487 .235-.487
3
/
4
*Evaporator coil fin material/condenser coil fin material.
†Weight of 14-in. roof curb.
**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.
††Pulley has 6 turns. Due to belt and pulley, moveable pulley cannot be set to 0 to 1 turns open.
llRollout switch is manual reset.
3
/
4
426
320
27
44
30 ± 5
45 ± 5
Cleanable
2...20 x 25 x 1
1...20 x 20 x 1
Throwaway
4...20 x 20 x 2
4...16 x 20 x 2
(230 and 460 v)
13/
8
17/
16
3
/
4
10.33
—6—
III. STEP 3 — FIELD FABRICATE DUCTWORK
On vertical units, secure all ducts to roof curb and building
structure. Do not connect ductwork to unit. Use flexible duct
connectors between unit and ducts as required. Adequately
insulate and weatherproof all ductwork located outdoors,
joints, and roof openings with counter flashing and mastic in
accordance with applicable codes. Insulate ducts passing
through unconditioned space, and use vapor barrier in accordance wit h the latest issue of SMACNA (Sheet Meta l and Air
Conditioning Contractors National Association) and ACCA
(Air Conditioning Contractors of America) minimum installation standards for heating and air conditioning systems.
Ducts passing through an unconditioned space must be insulated and covered with a vapor barrier.
A minimum clearance to combustibles of 1 in. for the first
24 in. of ductwork is required for all units with electric heat.
Cabinet return-air static shall not exceed –0.35 in. wg with
economizer or –0.45 in. wg without economizer.
IV. STEP 4 — MAKE UNIT DUCT CONNECTIONS
Unit is shipped for thru-the-bottom duct connections. Ductwork openings are shown in Fig. 1, 4, and 5. Duct
connections 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. Refer to
installation instructions shipped with accessory roof curb for
more information.
WARNING: For vertical supply and return units,
tools or parts coul d drop into ductwork a nd cause an
injury. Install a 90 degree turn in the return ductwork
between the unit and the conditioned space. If a
90 degree elbow cannot be installed, then a grille of
sufficient strength and density should be installed to
prevent objects from falling into the conditioned space.
V. STEP 5 — INSTALL FLUE HOOD AND WIND BAFFLE
Flue hood, screen, and wind baffle are shipped secured
under main control box. To install, secure flue hood and
screen to access panel with screws provided. 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.
Do not drill in this area; damage to basepan may result in water
NOTE:
leak.
Fig. 6 — Air Distribution — Thru-the-Bottom
(581A180, 240 Unit Shown)
Do not drill in this area; damage to basepan may result in water
NOTE:
leak.
Fig. 7 — Concentric Duct Air Distribution
(581A180, 240 Unit Shown)
Dimensions A, A’, B and
NOTE:
B’ are obtained from field-supplied ceiling diffuser.
Shaded areas indicate block-off pans.
Fig. 8 — Concentric Duct Details
INLET
WIND
BAFFLE
LOUVERS
FLUE
SCREEN
Fig. 9 — Flue Hood Location
—7—
INDUCED DRAFT
3/4" FPT DRAIN
CONNECTION
1-3/8"
DRAIN HOLE
INDOOR MOTOR ACCESS
FILTER
ACCESS
MOTOR
All field wiring must comply with NEC and local requirements. Insulate low-voltage wires for highest voltage contained within condui t when low-volta ge control wir es are run
in the same conduit as high-voltage wires .
COMBUSTION
FAN HOUSING
MAIN BURNER
SECTION
HEAT EXCHANGER
SECTION
Fig. 10 — Combustion Fan Housing Location
VI. STEP 6 — TRAP CONDENSATE DRAIN
See Fig. 4, 5, and 11 fore drain location. Plug is provided in
drain hole and must be removed when unit is operating. One
3
/4 in. half coupling is provided inside unit evaporat or section
for condensate drain connection. An 8
nipple and a 2 in. x
standard
3
/4 in. diameter elbow to provide a straight path
3
/4 in. diamet er pi pe ni ppl e are co uple d to
1
/2 in. x 3/4 in. diameter
down through holes in unit base rails (see Fig. 11 and 12). A
trap at least 4 inc hes deep must be used.
VII. STEP 7 — INSTALL GAS PIPING
The gas supply pipe enters the unit through the 1
diameter knockout provided. The gas connection to the unit
is made to th e
3
/4 in. FPT gas inlet on the gas manifold. Unit
1
/2 in.
is equipped for use with natural gas. Installation must conform with local building codes or, in the absence of local
codes, wi th 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.
Install sedim ent trap in riser leading to heating section. This
drip leg functions as a trap for dirt and condensate. Install
trap where condensate cannot freeze. Install this sediment
trap b y connecti ng a piping tee to riser lead ing to he ating
section, so that straight-through section of tee is vertical.
Then, connect capped n ipple in to lower end of t ee. Extend
capped nipple below level of gas contr ols.
Fig. 11 — Condensate Drain Details
(581A155 Shown)
Fig. 12 — Condensate Drain Piping Detai ls
WARNING: Do not pressure test gas supply while
connected to unit. Always disconnect union before
servicing.
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.
VIII. STEP 8 — MAKE ELECTRICAL CONNECTIONS
A. Field Power Supply
Unit is factory wired for voltage shown on unit nam epl ate.
When installing units, provide a disconnect per NEC
(National Electrical Code) requirements of adequate size
(Table 2).
Fig. 13 — Field Gas Piping
—8—
Route power and ground lines through control box end panel
or unit basepa n (s ee Fig. 4 and 5) to connections as shown on
unit wiring diag ram and Fig. 14.
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 compressor failure.
WARNING: The unit must be electrically grounded
in accordance with local codes and NEC ANSI/NFPA
70 (National Fire Protection Association).
Field wiring must conform 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 ) wi re.
2. Remove cap from orange ( 230 v ) spliced wire.
3. Replace oran ge wir e wi th 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, voltages 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. Such operation
would invalidate any warrant y.
B. Field Control Wiring
The unit must have a separate electrical service with a fieldsupplied , w at e rp ro o f, fuse d di sconnect sw i tc h mou nted at, or
within sight fr o m , th e unit. R ef e r to the u n i t r a ti n g plate fo r
maximum fuse/circuit breaker size and minimum circuit
amps (ampacity) for wire sizing. Be sure disconnect switch
does not obst ruct unit rating plate.
The field-supplied disconnect switchbox may be mounted on
the unit over the high-voltage inlet hole in the control corner
panel.
Connect ground lead to chassis ground connection when
using separate ground wire. The unit has a terminal block
for fie l d power connect ions. Inst all conduit conne ctors in side
panel power supply knockout openings indicated in Fig. 4
and 5. Route power lines through connector to unit control
box.
Install a Bryant approved accessory thermostat assembly
according to the installation instructions included with the
accessory. Locate thermostat assembly on a solid wall in the
conditioned s pace to sense average temperature.
Route thermostat cable or equivalent single leads of colored
wire from subbase terminals through conduit in unit to lowvoltage connections as shown on unit label wiring diagram
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 AW G 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 antic i pator settings as follows:
VOLT AGE W1 W2
208/230
460
0.98 0.44
0.80 0.44
The room thermostat heat anticipator must be properly
adjusted to ensure proper heating performance. Set the heat
anticipator to settings based on the table above, by using an
ammeter to determine the exact setting for stages 1 and 2.
Failure to make a proper heat anticipator adjustment may
result in improper operation, discomfort to the occupants of
the conditioned space, and inefficient energy utilization;
however, the required setting m ay be changed slightly to provide a greater de gr ee of comfort for a particular installation.
Refer to Accessory Remote Control Panel instructions if
required.
STEP 9 — MAKE OUTDOOR-AIR INLET ADJUSTMENTS
A. Manual Outdoor-Air Damper
All units (except those equipped with a factory-installed
economizer) have a manual outdoor-air damper to provide
ventilation air.
Damper can be preset to admit up to 25% outdoor air into
return-air compartment. To adjust, loosen securing screws
and move damper to desired setting. Retighten screws to
secure damper (Fig. 16).
B. Optional Economizer
Economizer Mot or C ontrol Module (See Fig . 17-19)
The economizer control location is shown Fig. 17. For maxi-
mum benefit of outdoor air, set economizer motor control
module to the “D” setting (Fig. 18). The economizer motor
control module is located on the economizer motor. See
Fig. 19.
The maximum wire size for TB1 is 2/0.
NOTE:
EQUIP —
GND —
NEC —
TB —
LEGEND
Equipment
Ground
National Electrical Code
T erminal Board
Fig. 14 — Field Power Wiring Connections
Fig. 15 — Field Control Therm ostat Wiring
—9—
Table 2 — Electrical Data
NOMINAL
UNIT
VOLTAGE
581A
(Standard
(Optional
LEGEND
FLA —
HACR —
IFM —
LRA —
MCA —
MOCP —
NEC —
OFM —
RLA —
*Fuse or HACR circuit breaker.
NOTES
1. In compliance with NEC requirements for multimotor and combination load equipment (refer
to NEC Articles 430 and 440), the overcurrent protective device for the unit shall be fuse or
HACR breaker. Canadian units may be fuse or circuit breaker.
2.
Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply voltage is greater than 2%.
the following formula to determine the percent voltage imbalance.
% Voltage Imbalance
= 100 x
(3 Ph, 60
Hz)
208/230 187 253 20.7 156 19.3 123 3 0.5 1.7 2.9
015
IFM)
015
IFM)
017
025
460 414 508 10 70 10 62 3 0.5 0.8 2.9 4.2
208/230 187 253 20.7 156 19.3 123 3 0.5 1.7 3.7
460 414 508 10 70 10 62 3 0.5 0.8 3.7 4.8
208/230 187 253 32.1 195 20.7 156 3 0.5 1.7 5.0
460 414 508 16.4 95 10 70 3 0.5 0.8 5.0 7.9
208/230 187 253 42 239 33.6 225 2 1 6.6 7.5
460 414 508 19.2 125 17.3 114 2 1 3.3 7.5 13.0
Full Load Amps
Heating, Air Conditioning and
Refrigeration
Indoor (Evaporator) Fan Motor
Locked Rotor Amps
Minimum Circuit Amps
Maximum Overcurrent Protection
National Electrical Code
Outdoor (Condenser) Fan Motor
Rated Load Amps
:
max voltage deviation from average voltage
average voltage
VOLTAGE
RANGE
Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp FLA FLA LRA FLA MCA MOCP*
COMPRESSOR
No. 1 No. 2
Use
7
457
POWER
EXHAUST
—
2.3—6.0
—
2.3—6.0
—
2.3—6.0
—
2.3—6.0
OFM IFM
8.8/
8.4—4.6—18.8
11.0/
10.5—4.6—18.8
15.8/
15.8—4.6—18.8
25.0/
25.0—4.6—18.8
EXAMPLE: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v
Average Voltage =
=
= 457
Determine maximum deviation from average voltage.
(AB) 457 – 452 = 5 v
(BC) 464 – 457 = 7 v
(AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent voltage imbalance.
% Voltage Imbalance = 100 x
= 1.53%
This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%.
IMPORTANT:
utility company immediately.
452 + 464 + 455
3
1371
3
If the supply voltage phase imbalance is more than 2%, contact y our local electric
COMBUSTION
FAN MOTOR
0.57
0.57
0.30
0.30
0.57
0.57
0.30
0.30
0.57
0.57
0.30
0.30
0.57
0.57
0.30
0.30
59/59
64/63
29
31
61/61
66/65
30
32
82/82
86/86
41
43
124/124
129/129
61
63
POWER
SUPPLY
110/110
110/110
150/150
150/150
70/70
80/80
35
40
80/80
80/80
35
40
50
50
80
80
—10—
Fig. 16 — 25% Outdoor-Air Sect ion Details
Fig. 17 — Economizer Damper Assembl y-End View
Fig. 19 — Economizer Motor Control
Module Location
Damper Vent Position Setting
1. Set fan switch at ON position (continuous fan operation) and close night switch if used.
2. Set system selecto r swit ch at OFF position.
3. Turn damper adjustment knob located on control
module clockwise slowly until dampers assume
desired v e n t p os iti on. Do not manually operate econo-
mizer motor, since damage to motor will res ult.
X. STEP 10 — INSTALL OUTDOOR-AIR HOOD
The outdoor-air hood is common to 25% air ventilation and
econ omizer. If eco nomizer is used , all elec trica l connec tions
have been made and adjusted at the factory. Assemble and
install hood in the field.
NOTE: The hood top panel, upper and lower filter retainers,
hood drain pan, baffle (sizes 180 and 240), and filter support
bracket are secured opposite the condenser end of the unit.
The screens, hood side panels, remaining section of filter
support bracket, seal strip, and other hardware are in a
package located inside the return-air filter access panel
(Fig. 20).
1. Attach seal strip to upper filter retainer. See Fig. 21.
2. Assemble hood top panel, side panels, upper filter
retainer, and drain pan (see Fig. 22 ).
LEGEND
LED —
Light- Emitti ng Diode
Fig. 18 — Economizer Motor Control Mod ule
(Part Number W7459A)
Fig. 20 — Outdoor-Air Hood Component Locati on
—11—
3. Secure lower filter retainer and long section of filter
support bracket to unit. See Fig. 22. Leave screws
loose on 180 and 240 units.
4. Slide baffle (sizes 180 and 240) behind lower filter
retainer and tighten screws.
5. Loosen sheet metal screws for top panel of base unitlocated above outdoor-air inlet opening, and remove
screws for hood side panels locat ed on the sides of the
outdoor-air inlet opening.
6. Match notches in hood top panel with unit top panel
screws. Insert hood flange between top panel flange
and unit. Tighten screws.
7. Hold hood side panel flanges flat against unit, and
install screws removed in Step 5.
Fig. 21 — Seal Strip Location
BAFFLE (180 AND 240 SIZES ONLY)
LOWER FILTER
RETAINER
FILTER SUPPORT
BRACKET
8. Insert outd oor-air inlet screens and spacer i n channel
created by lower filter retainer and filter support
bracket.
9. Attach remaining short section of filter support
bracket.
A. Enthalpy Control Installation
NOTE: The accessory outdoor-air enthalpy sensor must be
installed BEF OR E th e economizer hoods ar e installed on the
unit or hoods will have to be removed.
1. Remove and discard the factory-installed jumper
assembly containing the 800-ohm resistor on the
economizer control module (between terminals S
and +). See Fig. 18.
2. Remove black wire assembly containing the 620-ohm
resistor from between economizer control module terminal S
and the outdoor-air thermostat (O A T ). Place
O
this wire assembly (containing the 620-ohm resistor)
between economizer control module terminals S
and
R
+, replacing the jumper removed in Step 1. See
Fig. 18.
3. Disconnect the blue wire from the OAT.
4. Remove OAT from the outside of the economizer. See
Fig. 17.
5. Mount the enthalpy sensor (Fig. 23) to the economizer on the outside of the unit (in the same location
from which the OAT was removed) using the 2 screws
provided. See Fig. 17.
6. Reconnect the blue wire removed in Step 3 to the
enthalpy sen sor terminal +.
7. Cut the violet wire provided to desired length and
terminate with quick-connect terminal provided.
Route the violet wire from the enthalpy sensor terminal S, through the snap bushing, and to the economizer control module terminal S
. See Fig. 18.
O
8. Set changeover set point to the desired location. See
Fig. 24.
NOTE: For maximum benefit of outdoor air, set the enthalpy
control to the “A” setting. At this setting, when the relative
humidity is 50% and the outdoor air is below 74 F, the relay
contacts on the sens or will be closed.
9. Reinstall economizer hoods if removed.
IMPORTANT: Be sure all seal strips and RTV sealant are
intact. A watertight seal to inside of unit must be
maintained.
R
HOOD SIDE
HOOD TOP
PANEL
HOOD DRAIN PAN
UPPER FILTER RETAINER
The outdoor air hood comes with a baffle which is used on
NOTE:
sizes 180 and 240 only. Discard baffle for size 155 units.
PANELS (2)
FILTER SUPPORT
BRACKET
Fig. 22 — Outdoor-Air Hood Details
BAFFLE
(180 AND
240
ONLY)
LOWER
FILTER
RETAINER
Fig. 23 — Outdoor-Air and Return-Air
Enthalpy Sensor
—12—
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