Bryant DuraPac 558F, DuraPac Series Installation & Service Instructions Manual
installation, start-up and
558F
service instructions
SINGLE PACKAGE ROOFTOP
ELECTRIC HEAT/ELECTRIC COOLING UNITS
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-20
I. Step 1 — Provide Unit Support. . . . . . . . . . . . . . . . . 1
II. Step 2 — Rig and Place Unit. . . . . . . . . . . . . . . . . . . 1
III. Step 3 — Field Fabricate Ductwork . . . . . . . . . . . . . 9
IV. Step 4 — Make Unit Duct Connections . . . . . . . . . . .9
V. Step 5 — Trap Condensate Drain . . . . . . . . . . . . . . . 9
VI. Step 6 — Make Electrical Connections. . . . . . . . . . . 10
VII. Step 7 — Make Outdoor-Air Inlet
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
VIII. Step 8 — Install Outdoor-Air Hood. . . . . . . . . . . . . 14
IX. Step 9 — Install All Accessories . . . . . . . . . . . . . . 17
X. Step 10 — Install Humidity Control
Accessory for Optional Perfect Humidity™
Dehumidification Package . . . . . . . . . . . . . . . . . . . 18
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20-26
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26-32
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . .33,34
INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . CL-1
SAFETY CONSIDERATIONS
Installation and servicing 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 should be performed by trained service personnel. When working on air -conditio ning equip ment, observ e
precautions in the literature, tags and labels attached to the
unit, and other safety precautions that may apply.
Follow all safety codes. Wear safety glasse s and work g love 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 main power switch
to unit and install lockout tag on disconnect switch.
Electrical shock could cause personal injury.
IMPORTANT: Units have high ambient operating limits. If
limits are exceeded, the unit will automatically lock the compressor out of operation. Manual reset will be required to
restart the compressor.
DuraPac Series
Sizes 180-300
15 to 25 Tons
Cancels: New II 558F-180-1
6/15/02
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 horizonta l adapter. Accessory roof curb and
horizontal adapter roof curb and information required to
field fabricate a roof curb or h orizo ntal ada pter roo f curb are
shown in Fig. 1A, 1B 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 c urb or adapter roof curb as
shown in Fig. 1A and 1B. Improperly applied gasket can
result in air leaks and poor unit performance.
Curb or adapter roof curb should be le vel. This is necessary
to permit unit drain to function properly. Unit leveling tolerance is ±
sory 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 s upport area. If sl eepers
cannot be used, su ppor t l on g si des o f 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 da mage. 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 tol erance is ±
per linear ft in any direction. See Fig. 3 for additional 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. 4-6).
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
/16 in. per linear ft in any direction. Refer to Acces -
1
/16 in.
Fig. 1A — Roof Curb Details — 558F180-240
—2—
Fig. 1B — Roof Curb Details — 558F300
—3—
NOTE:
For preassembled horizontal adapter roof curb part no.
CRRFCURB013A00, the accessory kit includes a factory-designed,
high-static, transition duct. For horizontal curb part no.
CRRFCURB012A00, a field-supplied transition duct is required.
Fig. 2 — Horizontal Adapter Roof Curb
and Roof Curb
UNIT
558F
180
210
240
300
NOTES
:
1. Dimensions in ( ) are in millimeters.
2. Refer to Fig. 4-6 for unit operating weights.
MAXIMUM
SHIPPING WEIGHT
Lb Kg Ft-in. mm Ft-in. mm
1725 782 6-11
1785 810 6-11
1905 864 6-11
2255 1023 6-11
DIMENSIONS
AB
1
/22121 4- 0 1219
1
/22121 3-10 1168
1
/22121 3- 7 1092
1
/22121 3- 5 1041
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 EconoMi$er. See Fig. 4-6 for
EconoMi$er weight. See Table 1 for Perfect Humidity™ Dehumidification Package 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
—4—
Fig. 4 — Base Unit Dimensions — 558F180,210
—5—
Fig. 5 — Base Unit Dimensions — 558F240
—6—
(1219) if
″
-0
′
(8) on each side for top
16
/
5
-
′
(1219) for proper operation of damper and power exhaust if so
″
(1219) for proper condenser coil airflow.
-0
″
′
-0
′
(1219) for control box access.
(2134) for coil removal. This dimension can be reduced to 4
″
″
-0
′
Rear: 7
1. Refer to print for roof curb accessory dimensions.
2. Dimensions in ( ) are in millimeters.
3. Center of gravity.
NOTES:
4. Direction of airflow.
conditions permit coil removal from the top.
5. Ductwork to be attached to accessory roof curb only.
6. Minimum clearance:
(1829) to assure proper condenser fan operation.
″
-0
′
-0
′
Left Side: 4
Front: 4
Right Side: 4
equipped.
Top : 6
Local codes or jurisdiction may prevail.
exhaust as stated in Note #6, a removable fence or barricade requires no clearance.
cover drip edge.
for units equipped with electric heaters.
7. With the exception of clearance for the condenser coil and the damper/power
8. Dimensions are from outside of corner post. Allow 0
9. A 90 degree elbow must be installed on the supply ductwork below the unit discharge
10. The lower forklift braces must be removed prior to setting unit on roof curb.
Fig. 6 — Base Unit Dimensions — 558F300
—7—
Table 1 — Physical Data
UNIT 558F 180 210 240 300
NOMINAL CAPACITY (tons)
OPERATING WEIGHT
COMPRESSOR/MANUFACTURER
Quantity...Model (Ckt 1/Ckt 2)
Stages of Capacity Control (%)
Number of Refrigerant Circuits
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
Motor Hp
Motor Nominal Rpm
Maximum Continuous Bhp
Motor Frame Size
Nominal Rpm High/Low
Fan Rpm Range Low-Medium Static
Motor Bearing Type
Maximum Allowable Rpm
Motor Pulley Pitch Diameter
Min/Max (in.)
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
Fan Shaft Diameter at Pulley (in.)
HIGH-PRESSURE SWITCH (psig)
Cutout
Reset (Auto)
High Static
Low-Medium Static
High Static
High Static
High Static
Low-Medium Static
High Static
High Static
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.)
POWER EXHAUST
LEGEND
Bhp —
TXV —
†Circuit 1 uses the lower portion of the condenser coil and lower portion of the evaporator coils; and Circuit 2
**Pulley has 6 turns. Due to belt and pulley size, moveable pulley cannot be set to 0 to 1
††Pulley has 6 turns. Due to belt and pulley size, moveable pulley cannot be set to 0 to 1/2 turns open.
***The 558F300 unit requires 2-in. industrial-grade filters capable of handling face velocities up to 625 ft/min
NOTE:
Brake Horsepower
Thermostatic Expansion Valve
*The ZRU140KC compressor is a tandem compressor, consisting of a ZR72KC (25% total capacity) and a
ZR68KC (24% total capacity).
uses the upper por tion of both coils.
(such as American Air Filter no. 5700 or equivalent).
The 558F180-300 units have a low-pressure switch (standard) located on the suction side.
15 18 20 25
For Operating Weights see Fig. 4-6.
1...ZR94KC,
1...ZR72KC
60/40 55/45 55/45 50/50
22 2 2
85,60 106,81 106,106 106, 106
1...ZR108KC,
1...ZR94KC
Scroll/Copeland
1...ZR125KC,
1...ZR108KC
1...ZRU140KC*,
1...ZR144KC
R-22
TXV
19-8 19-8 19-11 26-13
13-8 19-2 19-14 25-10
Cross-Hatched
4...15 4...15 4...15 3...15 (2 coils)
21.7 21.7 21.7 43.4
10,500 10,500 14,200 21,000
3...22 3...22 2...30 6...22
1
/2...1050
1100 1100 3400 2200
Aluminum Pre-Coated, or Copper Plate Fins
1
/2...1050 1...1075
Cross-Hatched
4...15 4...15 4...15 4...15
17.5 17.5 17.5 17.5
2...12x12 2...12 x 12 2...12 x 12 2...12 x 12
Belt Belt Belt Belt
6000 7200 8000 10,000
55 7.5 10
1745 1745 1745 1740
6.13 5.90
184T 184T 213T 215T
873-1021 910-1095 1002-1151 1066-1283
1025-1200 1069-1287 1193-1369 1332-1550
Ball Ball Ball Ball
1550 1550 1550 1550
4.9/5.9 4.9/5.9 5.4/6.6 4.9/5.9
4.9/5.9 4.9/5.9 5.4/6.6 4.9/5.9
1
/
1
8
9.4 9.4 9.4 8.0
8.0 8.0 7.9 6.4
7
/
1
16
1...BX...50 1...BX...50 1...BX...53 2...BX...50
1...BX...48 1...BX...48 1...BX...50 2...BX...47
13.3-14.8 13.3-14.8 14.6-15.4 14.6-15.4
37 37 37 36
44 34 44 45
—— —
11/
17/
3
/8-in. Copper Tubes, Aluminum Lanced,
Propeller Type
3
/8-in. Copper Tubes, Aluminum Lanced or
Copper Plate Fins, Face Split
Centrifugal Type
8.70 [208/230 v]
9.50 [460 v]
17/
13/
8
16
8
16
1
/2...1050
10.20 [208/230 v]
11.80 [460 v]
6** 6†† 6** 6††
3.5 3.5 3.5 3.5
965 1002 1120 1182
1134 1178 1328 1470
7
/
1
16
17/
16
17/
16
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
1
/2 Hp, 208/230-460 v Motor Direct Drive, Propeller-Fan (Factory-Wired for 460 v)
1
/2 turns open.
4...16 x 20 x 2
17/
17/
13/
8
16
16
—8—
III. STEP 3 — FIELD FABRICATE DUCTWORK
3/4" FPT DRAIN
CONNECTION
1-3/8"
DRAIN HOLES
Secure all duct s to bu ilding struct ure. Use fl exible duct con nectors between unit and ducts as required. Insulate and
weatherproof all external ductwork, joints, and roof openings
with counter flashing and m asti c i n acc ordance with applicable codes.
Ducts passing through a n unc ondit i one d spa ce must be insulated and covered with a vapor barrier.
The 558F 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 degre e 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 through-the-bottom duct connections.
Ductwork openings ar e show n in F i g. 7. Field-fabricated concentric ductwork may be conne cted as shown in Fig. 8 and 9.
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. 4-6, an d 10 for drain locat ion. Plug is provide d 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
diameter nipple and a 2-in. x
coupled to standard
3
3
/4-in. diameter pipe nipple are
/4-in. diameter elbows to provide a
1
/2 in. x 3/4-in.
straight path down through holes in unit base rails (see
Fig. 11). 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. 7 — Air Distribution — Thru-the-Bottom
NOTE:
Do not drill in this area; damage to basepan may result in water
leak.
Fig. 8 — Concentric Duct Air Distribution
Shaded area indicates block-off panels.
NOTE:
Dimensions A, A′, and B, B′ are obtained from field-supplied
ceiling diffuser.
Fig. 9 — Concentric Duct Details
Fig. 10 — Condensate Drain Details
(558F180,210 Shown)
—9—
Fig. 11 — Make Electrical Connections
VI. STEP 6 — MAKE ELECTRICAL CONNECTIONS
A. Field Power Supply
Unit is factory wired for voltage sh own on nameplate.
When installing units, provide a disconnect, per NEC
(National 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. 4-6) to connections as shown on unit wiring
diagram and Fig. 12.
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%.
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 res ult of ope ra tio n o n imp ro per line volt age
or excessive phase imbalance constitutes abuse and may
cause damage to electrical components.
B. Field Control Wiring
Install a Bryant-approved accessory thermostat assembly or
light commercial therm idistat for units equipped with Perfect Humidity™ Dehumidification option, according to the
installation inst ructions included with th e 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. 18
AWG (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. 13.
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 wi re larger than
no. 18 AWG cannot be directly connected to the thermost at
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 pr ovide a greater degree of comfort for a particular installation.
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 m ay lead to premature compres sor failure.
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 =
=
455 + 464 + 455
3
1371
3
= 457
Determine ma ximum 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:
Percentage of Voltage Imbalance = 100 x
7
457
= 1.53%
UNIT
558F
All
EQUIP —
GND —
kcmil —
NEC —
TB —
LEGEND
Equipment
Ground
Thousand Circular Mils
National Electrical Code
Terminal Block
Fig. 12 — Field Power Wiring Connections
REMOVABLE JUMPER
RC
RH
R
RED
Fig. 13 — Field Control Thermostat Wiring
TB1 MAXIMUM WIRE SIZE
VOLTAGE
208/230 460
350 kcmil 2/0
THERMOSTAT ASSEMBLY
PNK
W1
W1Y2
ORN
W2
W2
VIO
GC
G
BLK
Y1 Y2
Y1
BLU
UNIT LOW-VOLTAGE CONNECTIONS
C
BRN
L
X
X
WHT
—10—
Table 2 — Electrical Data
UNIT
558F
180
210
240
NOMINAL
VOLTAGE
(3 Ph, 60 Hz)
208/230 187 253 32.1 195 ——20.7 156 3 0.5 1.7 5.0 15.8/15.8
460 414 508 16.4 95 ——10 70 3 0.5 0.8 5.0 7.9
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 42 239 ——33.6 225 2 1 6.6 7.5 25.0/25.0
460 414 508 19.2 125 ——17.3 114 2 1 3.3 7.5 13.0
VOLTAGE
RANGE
Min Max RLA LRA RLA LRA RLA LRA Qty Hp
COMPRESSOR
No. 1 No. 1A No. 2
OFM IFM
FLA
Hp FLA FLA LRA kW FLA MCA MOCP†
(ea)
POWER
EXHAUST
—— — — 82/ 82 110/110
4.6 18.8 ——86/ 86 110/110
——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
4.6 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
—— — — 41 50
2.3 6.0 —— 43 50
—— 32
2.3 6.0 32 39 62 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
—— — — 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
4.6 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
—— — — 124/124 150/150
4.6 18.8 ——129/129 150/150
——26/34 71/ 82 124/134 150/150
4.6 18.8 26/34 71/ 82 129/140 150/150
——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
—— — — 61 80
2.3 6 —— 63 80
—— 32 39 65 80
2.3 6 32 39 68 80
—— 55 66 82 90
2.3 6 55 66 85 90
—— 80 96 112 125
2.3 6 80 96 115 125
ELECTRIC
HEAT*
39
POWER SUPPLY
59 60
Table continued on next page.
—11—
Table 2 — Electrical Data (cont)
UNIT
558F
FLA —
HACR —
IFM —
LRA —
MCA —
MOCP —
NEC —
OFM —
RLA —
*Heater capacity (kW) is based on heater voltage of 208 v, 240 v and 480 v.
†Fuse or HACR circuit breaker.
**Electric heaters are field installed.
NOTES:
EXAMPLE: Supply voltage is 460-3-60.
NOMINAL
VOLTAGE
(3 Ph, 60 Hz)
208/230 187 253 20.7 156 20.7 156 47.1 245 6 0.5 1.7 10.0 28.0/28.0
300
460 414 508 10.0 75 10.0 75 19.6 125 6 0.5 0.8 10.0 14.6
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
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. To determine heater
capacity at actual unit voltage, multiply 240 v or 480 v capacity by multipliers
found in table in Note 4.
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. The Canadian units may
be fuse or circuit breaker.
Unbalanced 3-Phase Supply Voltage
2.
Never operate a motor where a phase imbalance in supply voltage is greater
than 2%.
imbalance.
% Voltage Imbalance
Use the following formula to determine the percent of voltage
= 100 x
VOLTAGE
RANGE
Min Max RLA LRA RLA LRA RLA LRA Qty Hp
LEGEND
max voltage deviation from average voltage
average voltage
AB = 452 v
BC = 464 v
AC = 455 v
Average Voltage =
COMPRESSOR
No. 1 No. 1A No. 2
452 + 464 + 455
3
1371
=
3
= 457
OFM IFM
FLA
Hp FLA FLA LRA kW FLA MCA MOCP†
(ea)
Determine maximum deviation from average voltage.
(AB) 457 – 452 = 5 v
(BC) 464 – 457 = 7 v
(AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent voltage imbalance.
% Voltage Imbalance = 100 x
This amount of phase imbalance is satisfactory as it is below the maximum
allowable 2%.
IMPORTANT:
your local electric utility company immediately.
3. MCA calculation for 558F units with electric heaters over 50 kW = (1.25 x
4. Use the following table to determine heater capacity at actual voltage.
If the supply voltage phase imbalance is more than 2%, contact
IFM amps) + (1.00 x heater FLA).
HEATER
RATING
VOLTAGE
240
0.694 0.751 0.918 1.000 ————
480
EXAMPLE: 34 kW (at 230 v) heater on 208 v
= 34.0 (.751 mult factor)
= 25.5 kW capacity at 208 v.
POWER
EXHAUST
—— — — 138/138 175/175
4.6 18.8 ——143/143 175/175
——26/34 71/ 82 138/138 175/175
4.6 18.8 26/34 71/ 82 143/143 175/175
——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
—— — — 64 80
2.3 6 —— 66 80
—— 32 39 67 80
2.3 6 32 39 70 80
—— 55 66 84 90
2.3 6 55 66 87 100
—— 80 96 114 125
2.3 6 80 96 117 125
= 1.53%
200 208 230 240 380 440 460 480
————0.626 0.840 0.918 1.000
ELECTRIC
HEAT*
7
457
ACTUAL HEATER VOLTAGE
POWER SUPPLY
—12—
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