Bryant 559F User Manual
installation, start-up
and service instructions
SINGLE PACKAGE ROOFTOP
ELECTRIC HEA TING/ELECTRICCOOLING UNITS
Cancels: II 559F-180-3 II 559F-180-4
559F
Sizes 180-300
15 to 25 Tons
10/15/98
CONTENTS
Page
SAFETY CONSIDERATIONS ........................1
INSTALLATION .................................1-15
I. Step 1 — Provide Unit Support ...............1
II. Step 2 — Rig and Place Unit .................1
III. Step 3 — Field Fabricate Ductwork ............7
IV. Step 4 — Make Unit Duct Connections .........7
V. Step5—TrapCondensate Drain ..............7
VI. Step 6 — Make Electrical Connections .........8
VII. Step 7 — Make Outdoor-Air Inlet
Adjustments ......................11
VIII. Step 8 — Install Outdoor-Air Hood ...........12
IX. Step 9 — Install All Accessories .............13
START-UP ....................................15-20
SERVICE .....................................20-24
TROUBLESHOOTING ............................25
START-UP CHECKLIST ..........................CL-1
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can
be hazardous due to system pressure and electrical components. Only trained and qualified service personnel should
install, repair, or service air-conditioning equipment.
Untrained personnel can perform basic maintenance functions of cleaning coils and filters and replacing filters.Allother
operations should be performed by trained service personnel.
When working on air-conditioning equipment, observe precautions in the literature, tags and labels attached to the unit,
and other safety precautions that may apply.
Follow all safety codes. Wear safety glasses and work gloves.
Use quenching cloth for unbrazing operations. Have fire extinguishers available for all brazing operations.
WARNING:
nance operations on unit, turn off main power switch
to unit. Electrical shock could cause personal injury.
IMPORTANT: Units have high ambient operating limits. If
limits are exceeded, the units will automatically lock the compressor out of operation. Manual reset will be required to restart the compressor.
Before performing service or mainte-
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 the
curb or horizontal adapter. Accessory roof curb and horizontal adapter roof curb and information required to field fabricate a roof curb or horizontal adapter roof curb are shown in
Fig. 1 and 2. Install insulation, cant strips, roofing, and counter
flashing as shown. Ductwork can be secured to roof curb before unit is set in place.
IMPORTANT: The gasketing of the unit to the roof curb or
adapter roof curb is critical for a leak-proof seal. Install gasket supplied with the roof curb or adapter roof curb as shown
in Fig. 1. Improperly applied gasket can result in air leaks
and poor unit performance.
Curb or adapter roof curb should be level. This is necessary
to permit unit drain to function properly. Unit leveling tolerance is 6
cessory Roof Curb or Horizontal Adapter Roof Curb Installation Instructions for additional information as required.
B. Alternate Unit Support
When the curb or adapter cannot be used, support unit with
sleepers using unit curb or adapter 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. Keep unit upright, and do not drop.
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 reference; leveling tolerance is
1
6
tional information. Unit 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
Provide clearance around and above unit for airflow, safety,
and service access (Fig. 4 and 5).
Do not install unit in an indoor location. Do not locate air inlets near exhaust vents or other sources of contaminated air.
Although unit is weatherproof, guard against water from higher
level runoff and overhangs.
B. Roof Mount
Check building codes for weight distribution requirements.
1
⁄16in. per linear ft in any direction. Refer to Ac-
⁄16in. per linear ft in any direction. See Fig. 3 for addi-
PKG.
NO. REF.
308450-201
308450-202
308450-203
CURB
HEIGHT
18-29
(305)
28-09
(610)
28-09
(610)
DESCRIPTION
Standard Curb
149 High
Standard Curb
for Units
Requiring High
Installation
Side Supply
and Return Kit
for High Installation
NOTES:
1. Roof curb accessory is shipped disassembled.
2. Insulated panels:
3. Dimensions in ( ) are in millimeters.
4. Direction of airflow.
5. Roof curb: 16 ga. (VA03-56) stl.
NOTE: To prevent the hazard of stagnant water build-up in the drain pan of the
indoor section, unit can only be pitched as shown.
1
⁄29 thick neoprene coated 2 lb density.
UNIT LEVELING TOLERANCES*
Dimensions (degrees and inches)
—2—
Fig. 1 — Roof Curb Details
UNIT
AB
DEG. IN. DEG. IN.
559F .28 .45 .28 .43
*From edge of unit to horizontal.
NOTE: For preassembled horizontal adapter roof curb part no.
389210-201, the accessory kit includes a factory-designed, highstatic, regain transition duct. For horizontal curb part no. 308450203, a field-supplied transition duct is required.
Fig. 2 — Horizontal Adapter Roof Curb and Roof Curb
UNIT
559F
MAXIMUM
SHIPPING WEIGHT
lb kg ft-in. mm ft-in. mm
180 1625 737 6-11
216 1725 782 6-11
240 1835 832 6-11
300 1985 900 6-11
NOTES:
1. Dimensions in ( ) are in millimeters.
2. Refer to Fig. 5 and 6 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.
5. Weights do not include optional economizer. See Fig. 5 and 6 for
economizer weight.
6. Weights given are for aluminum evaporator and condenser coil
plate fins. For copper condenser coil add 150 lb (68 kg). For copper condenser and evaporator coils add 280 lb (127 kg).
DIMENSIONS
AB
1
⁄22121 4- 0 1219
1
⁄22121 3-10 1168
1
⁄22121 3- 7 1092
1
⁄22121 3- 5 1041
CAUTION: All panels must be in place when rigging.
Fig. 3 — Rigging Details
—3—
—4—
UNIT
559F180 1550 703 110 50 391 177 365 166 384 174 410 186 3-5 1041 3-6 1067 1-10 559
559F216 1650 748 110 50 399 181 384 174 402 182 439 199 3-4 1016 3-6 1067 1- 8 508
POWER EXHAUST/
BAROMETRIC RELIEF
(ACCESSORY ONLY)
STD UNIT
WEIGHT
Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg ft-in. mm ft-in. mm ft-in. mm
ECONOMIZER
WEIGHT
CORNERACORNERBCORNERCCORNER
NOTES:
1. Refer to print for roof curb accessory dimensions.
2. Dimensions in ( ) are in millimeters.
3. Center of Gravity.
DIM A DIM B DIM C
D
4. Direction of airflow.
5. Ductwork to be attached to accessory roof curb only.
6. Minimum clearance:
• Rear: 78-09 (2134) for coil removal. This dimension can be reduced to 48-09 (1219)
if conditions permit coil removal from the top.
• Left side: 48-09 (1219) for proper condenser coil airflow.
• Front: 48-09 (1219) for control box access.
• Right side: 48-09 (1219) for proper operation of damper and power exhaust if so
equipped.
• Top: 68-09 (1829) to assure proper condenser fan operation.
• 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 08cover drip edge.
5
⁄169 (8) on each side for top
Fig. 4 — Base Unit Dimensions, 559F180 and 216
—5—
STD UNIT
UNIT
559F240 1700 771 110 50 419 190 394 179 425 193 463 210 3-4 1016 3-5 1041 1-8 508
559F300 1850 839 110 50 428 194 412 187 511 232 499 226 3-2 965 3-7 1092 1-8 508
ECONOMIZER
WEIGHT
Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg ft-in. mm ft-in. mm ft-in. mm
WEIGHT
CORNERACORNERBCORNERCCORNER
NOTES:
1. Refer to print for roof curb accessory dimensions.
2. Dimensions in ( ) are in millimeters.
3. Center of Gravity.
D
DIM A DIM B DIM C
4. Direction of airflow.
5. Ductwork to be attached to accessory roof curb only.
6. Minimum clearance:
• Rear: 78-09 (2134) for coil removal. This dimension can be reduced to 48-09 (1219)
if conditions permit coil removal from the top.
• Left side: 48-09 (1219) for proper condenser coil airflow.
• Front: 48-09 (1219) for control box access.
• Right side: 48-09 (1219) for proper operation of damper and power exhaust if so
equipped.
• Top: 68-09 (1829) to assure proper condenser fan operation.
• 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
POWER EXHAUST/
BAROMETRIC RELIEF
(ACCESSORY ONLY)
clearance.
8. Dimensions are from outside of corner post. Allow 08cover drip edge.
5
⁄169 (8) on each side for top
Fig. 5 — Base Unit Dimensions, 559F240 and 300
Table 1 — Physical Data
UNIT 559F 180 216 240 300
NOMINAL CAPACITY (tons) 15 18 20 25
OPERATING WEIGHT 1550 1650 1700 1850
COMPRESSOR Scroll, Copeland
Quantity ... Model (Ckt 1 , Ckt 2)
Number of Refrigerant Circuits 22 2 2
Oil (oz) (Ckt 1 , Ckt 2) 81, 81 106,81 106, 106 136, 106
REFRIGERANT TYPE R-22
Expansion Device TXV
Operating Charge (lb-oz)
Circuit 1 * 10-10 15-5 16-0 20-13
Circuit 2 10-10 12-3 13-6 13- 0
2...ZR94KC
CONDENSER COIL Cross-Hatched
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 10,500 14,200 14,200
Quantity...Diameter (in.) 3...22 3...22 2...30 2...30
Motor Hp...Rpm
Watts Input (Total) 1100 1100 3400 3400
1
⁄2...1050
EVAPORATOR COIL Cross-Hatched
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
Motor Frame Size 56H 184T 213T 215T
Nominal Rpm High/Low —— — —
Fan Rpm Range Low-Medium Static 891-1179 910-1095 1002-1225 1066-1283
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.)
Fan Pulley Pitch Diameter (in.) Low-Medium Static 6.0 9.4 9.4 8.0
Nominal Fan Shaft Diameter (in.) 1
Belt, Quantity...Type...Length (in.) Low-Medium Static 1...BX...42 1...BX...50 1...BX...53 2...BX...50
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 Low-Medium Static 48 37 37 36
Movable Pulley Flange (rpm) High Static 55 34 44 45
Movable Pulley Maximum Full Turns
From Closed Position
Factory Speed 3.5 3.5 3.5 3.5
Factory Speed Setting (rpm) Low-Medium Static 1035 1002 1120 1182
Fan Shaft Diameter at Pulley (in.) 1
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
RETURN-AIR FILTERS Throwaway**
Quantity...Size (in.) 4...20 x 20 x 2
High Static 1227-1550 1069-1287 1193-1458 1332-1550
High Static 5.2 8.0 7.9 6.4
High Static 1...BX...42 1...BX...48 1...BX...50 2...BX...47
High Static 1389 1178 1328 1470
POWER EXHAUST
4.25 5.90
7
⁄
8
3
⁄
16
55 5 5
3
⁄
16
1
⁄2Hp, 208/230-460 v Motor Direct Drive, Propeller-Fan (Factory-Wired for 460 v)
LEGEND
Bhp — Brake Horsepower
TXV — Thermostatic Expansion Valve
*Circuit 1 uses the lower portion of the condenser coil and lower portion of the evaporator coils; and
Circuit 2 uses the upper portion of both coils.
†The 559F300 unit requires 2-in. industrial-grade filters capable of handling face velocities up to 625 ft/min
(such as American Air Filter no. 5700 or equivalent).
NOTE: The 559F units have a low-pressure switch (standard) located on the suction side.
1...ZR108KC,
1...ZR94KC
3
Aluminum Pre-Coated, or Copper Plate Fins
⁄8-in. Copper Tubes, Aluminum Lanced,
1
⁄2...1050 1...1075 1...1075
3
⁄8-in. Copper Tubes, Aluminum Lanced or
Copper Plate Fins, Face Split
11⁄
8
17⁄
16
17⁄
16
1...ZR125KC,
1...ZR108KC
8.7 [208/230 v]
9.5 [460 v]
13⁄
8
17⁄
16
17⁄
16
10.2 [208/230 v]
1...20 x 20 x 1
4...16 x 20 x 2
1...ZR16M3,
1...ZR125KC
11.8 [460 v]
13⁄
8
17⁄
16
17⁄
16
—6—
III. STEP 3 — FIELD FABRICATE DUCTWORK
Secure all ducts to building structure. Use flexible duct connectors between unit and ducts as required. Insulate and weatherproof all external ductwork, joints, and roof openings with
counter flashing and mastic in accordance with applicable codes.
Ducts passing through an unconditioned space must be insulated and covered with a vapor barrier.
The 559F units with electric heat require a 1-in. clearance
for the first 24 in. of ductwork.
Outlet grilles must not lie directly below unit discharge.
NOTE: A 90-degree elbow must be provided in the ductwork
to comply with UL (Underwriters’ Laboratories) codes for use
with electric heat.
WARNING:
For vertical supply and return units, tools
or parts could drop into ductwork and 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. Due to electric heater, supply duct will require 90 degree elbow.
IV. STEP 4 — MAKE UNIT DUCT CONNECTIONS
Unit is shipped for thru-the-bottom duct connections. Ductwork openings 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.
V. STEP 5 — TRAP CONDENSATE DRAIN
See Fig. 4, 5, and 9 for 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 evaporator section
for condensate drain connection. An 8
3
nipple and a 2-in. x
3
standard
⁄4-in. diameter elbows to provide a straight path
⁄4-in. diameter pipe nipple are coupled to
1
⁄2in. x3⁄4-in. diameter
down through holes in unit base rails (see Fig. 10). A trap at
least 4-in. deep must be used.
NOTE: Do not drill in this area, as damage to basepan may result in
water leak.
Fig. 6 — Air Distribution — Thru-the-Bottom
(559F216-300 Shown)
NOTE: Do not drill in this area, as damage to basepan may result in
water leak.
Fig. 7 — Concentric Duct Air Distribution
(559F216-300 Shown)
Shaded area indicates block-off panels.
NOTE: Dimension A, A8 and B, B8 are obtained from field-supplied ceil-
ing diffuser.
Fig. 8 — Concentric Duct Details
3/4" FPT DRAIN
CONNECTION
1-3/8"
DRAIN HOLES
Fig. 9 — Condensate Drain Details
(559F180,216 Shown)
—7—
Fig. 10 — Condensate Drain Piping Details
VI. STEP 5 — MAKE ELECTRICAL CONNECTIONS
A. Field Power Supply
Unit is factory wired for voltage shown on nameplate.
When installing units, provide a disconnect, per NEC (Na-
tional Electrical Code) requirements, of adequate size
(Table 2).
All field wiring must comply with NEC and local
requirements.
Route power lines through control box access panel or unit
basepan (Fig. 4 and 5) to connections as shown on unit wiring diagram and Fig. 11.
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% and the current
must be balanced within 10%.
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.
This amount of phase imbalance is satisfactory as it is below
the maximum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is
more than 2%, contact your local electric utility company
immediately.
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 the installation instructions included with the accessory. Locate thermostat assembly on a solid wall in the
conditioned space to sense average temperature.
Route thermostat cable or equivalent single leads of
no. 18AWG(American Wire Gage) colored wire from subbase
terminals through conduit in unit to low-voltage connections
as shown on unit label wiring diagram and in Fig. 12.
NOTE: For wire runs up to 50 ft, use no. 18 AWG 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 to the thermostat
and will require a junction box and splice at the thermostat.
Set heat anticipator settings as indicated in Table 3. Settings
may be changed slightly to provide a greater degree of comfort for a particular installation.
Refer to accessory remote control instructions as
required.
Use the following formula to determine the percentage of voltage imbalance.
Percentage of Voltage Imbalance
= 100 x
max voltage deviation from average voltage
average voltage
EXAMPLE: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v
Average Voltage =
452 + 464 + 455
1371
=
3
3
= 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 the percentage of voltage imbalance:
Percentage of Voltage Imbalance = 100 x
7
457
= 1.53%
TB1 MAXIMUM WIRE SIZE
UNIT
559F
All 350 kcmil 2/0
EQUIP — Equipment NEC — National Electrical
GND — Ground Code
kcmil — Thousand Circular TB — Terminal Block
Mils
208/230 460
LEGEND
VOLTAGE
Fig. 11 — Field Power Wiring Connections
UNIT LOW-VOLTAGE CONNECTIONS
Fig. 12 — Field Control Thermostat Wiring
—8—
Table 2 — Electrical Data
UNIT
559F
180
(15 Tons)
216
(18 Tons)
240
(20 Tons)
NOMINAL
VOLTAGE
(3 Ph, 60 Hz)
208/230 187 253 28.8 195 28.8 195 3 0.5 1.7 3.7 10.5/11.0
460 414 508 14.7 95 14.7 95 3 0.5 0.8 3.7 4.8
208/230 187 253 30.1 225 28.8 195 3 0.5 1.7 5.0 15.8/15.8
460 414 508 15.5 114 14.7 95 3 0.5 0.8 5.0 7.9
208/230 187 253 37.8 239 30.1 225 2 1 6.6 7.5 25.0/25.0
460 414 508 17.2 125 15.5 114 2 1 3.3 7.5 13.0
VOLTAGE
RANGE
Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp FLA FLA LRA kW FLA MCA MOCP†
COMPRESSOR
No. 1 No. 2
OFM IFM
POWER
EXHAUST
— — — — 81/81 100/100
4.6 18.8 — — 85/86 110/110
— — 26/34 71/82 102/116 110/125
4.6 18.8 26/34 71/82 108/122 110/125
— — 42/56 117/135 159/149 175/175
4.6 18.8 42/56 117/135 165/155 175/175
— — 56/75 156/180 169/194 200/225
4.6 18.8 56/75 156/180 175/200 200/225
— — — — 40 50
2.3 6.0 — — 43 50
— — 32 39 55 60
2.3 6.0 32 39 58 60
— — 55 66 72 80
2.3 6.0 55 66 75 80
— — 80 96 102 110
2.3 6.0 80 96 105 110
— — — — 87/87 110/110
4.6 18.8 — — 92/92 110/110
— — 26/34 71/82 109/122 110/125
4.6 18.8 26/34 71/82 114/128 125/150
— — 42/56 117/135 166/155 175/175
4.8 18.8 42/56 117/135 172/161 175/175
— — 56/75 156/180 176/200 200/225
4.6 18.8 56/75 156/180 182/206 200/225
— — — — 44 50
2.3 6.0 — — 47 60
— — 32 39 59 60
2.3 6.0 32 39 61 70
— — 55 66 76 90
2.3 6.0 55 66 79 90
— — 80 96 106 125
2.3 6.0 80 96 109 125
— — — — 116/116 150/150
4.6 18.8 — — 120/120 150/150
— — 26/34 71/82 120/134 150/150
4.6 18.8 26/34 71/82 126/140 150/150
— — 42/56 117/135 178/166 200/175
4.6 18.8 42/56 117/135 183/172 200/175
— — 56/75 156/180 187/211 200/225
4.6 18.8 56/75 156/180 193/217 200/225
— — — — 57 70
2.3 6.0 — — 59 70
— — 32 39 65 70
2.3 6.0 32 39 68 70
— — 55 66 82 90
2.3 6.0 55 66 85 90
— — 80 96 112 125
2.3 6.0 80 96 115 125
ELECTRIC
HEAT*
POWER
SUPPLY
—9—
Table 2 — Electrical Data (cont)
UNIT
559F
300
(25 Tons)
FLA — Full Load Amps
HACR — Heating, Air Conditioning and Refrigeration
IFM — Indoor (Evaporator) Fan Motor
LRA — Locked Rotor Amps
MCA — Minimum Circuit Amps
MOCP — Maximum Overcurrent Protection
NEC — National Electrical Code
OFM — Outdoor (Condenser) Fan Motor
RLA — Rated Load Amps
*Heater capacity (kW) is based on heater voltage of 208 v, 240 v,
and 480 v. Heaters are rated at 240 v and 480 v. If power distribution
voltage to unit varies from rated heater voltage, heater kW will vary
accordingly.
†Fuse or HACR circuit breaker.
NOTES:
1. In compliance with NEC requirements for multimotor and combination load
equipment (refer to NECArticles 430 and 440), the overcurrent protective
device for the unit shall be fuse or HACR breaker. The 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%.
imbalance.
% Voltage Imbalance =
100 x
NOMINAL
VOLTAGE
(3 Ph, 60 Hz)
208/230 187 253 41.0 350 37.8 239 2 1 6.6 10.0 28.0/28.0
460 414 508 21.8 158 17.2 125 2 1 2.8 10.0 14.6
Use the following formula to determine the percent of voltage
max voltage deviation from average voltage
VOLTAGE
RANGE
Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp FLA FLA LRA kW FLA MCA MOCP†
LEGEND
average voltage
COMPRESSOR
No. 1 No. 2
OFM IFM
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%.
IMPORTANTIfthe supply voltage phase imbalance is more than 2%, contact
your local electric utility company immediately.
3. MCA calculation for units with electric heaters over 50 kW
= (1.25 x IFM amps) + (1.00 x heater FLA).
POWER
EXHAUST
— — — — 130/130 150/150
4.6 18.8 — — 135/135 175/175
— — 26/34 71/82 130/138 150/150
4.6 18.8 26/34 71/82 135/143 175/175
— — 42/56 117/135 181/170 200/175
4.6 18.8 42/56 117/135 187/176 200/200
— − 56/75 156/180 191/215 200/225
4.6 18.8 56/75 156/180 197/221 200/225
— — — — 66 80
2.3 6.0 — — 68 80
— — 32 39 67 80
2.3 6.0 32 39 70 80
— — 55 66 84 90
2.3 6.0 55 66 87 100
— — 80 96 114 125
2.3 6.0 80 96 117 125
AB = 452 v
BC = 464 v
AC = 455 v
Average Voltage =
= 1.53%
ELECTRIC
=
= 457
7
457
HEAT*
452 + 464 + 455
3
1371
3
POWER
SUPPLY
—10—
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