Bohn BNE-D04-A031 Service Manual
AIRCOOLED CONDENSERS
Technical Guide
Monarch™ and Ambassador™ Series
BNACCTB
JULY 2009
TABLE OF CONTENTS
Overview ................................................................................. 2, 3
Features & Options .............................................................. 3, 4
Three Solutions ..........................................................................5
Nomenclature .............................................................................6
Condenser Selection Procedure ......................................7-9
Ambassador™ Series
540 RPM ...........................................................................10-11
830 RPM ...........................................................................12-15
Monarch™ Series
EC Selection .......................................................................... 16
Sound Data ........................................................................... 16
Energy Comparison ........................................................... 17
Capacities .............................................................................. 18
Specications ....................................................................... 19
OVERVIEW
The Bohn Monarch and Ambassador Series of direct
drive air-cooled condensers incorporate the latest
advancements in condenser technology to provide the
quietest and most ecient condensers in the industry.
Monarch™ Series
Optimized sound and energy performance.
The Monarch Series of condensers by Bohn oers the
optimum solution for sound and energy performance.
The Monarch Series utilizes variable speed EC (VSEC)
motor technology, which provides unmatched sound
and energy performance and is the perfect solution
for those applications where low noise levels and
signicant energy savings are essential for success.
1140 RPM Series
Features & Options ............................................................ 20
Capacities .............................................................................. 21
Specications ....................................................................... 22
Dimensions ............................................................................... 23
Fan Cycling ..........................................................................24-25
Control Panels for Electronic Controllers ....................... 26
Condenser Refrigerant Charge ....................................26-28
Calculate Refrigerant Charge ............................................. 28
Typical Condenser Wiring Diagrams .........................29-30
Sound Data ............................................................................... 31
Ambassador™ Series
Excellence in sound, energy
and capacity solutions.
The Ambassador Series of condensers by Bohn is
designed specically with the growing needs of the
supermarket and grocery industry in mind. This series
utilizes 830 and 540 RPM motors and incorporates
advanced features that further improve sound levels
and energy eciencies, as well as provide increased
capacity in a smaller footprint. In addition, there are
new features designed to improve serviceability,
resulting in reduced maintenance costs.
The Ambassador Series is a perfect t for applications
requiring low sound and energy levels and
optimized capacities.
Since product improvement is a continuing eort, we reserve the
right to make changes in specications without notice.
2
1140 Series
Bohn continues to oer the 1140 RPM Series for
customers seeking the most economical solution for
their capacity requirements.
Bohn condensers now incorporate a broader product
range with capacities ranging from 11 to 265 nominal
tons to address all applications.
All Bohn condenser coils incorporate the Floating Tube™
coil design, which virtually eliminates the possibility
of tube sheet leaks. Condenser coils are designed for
maximum heat transfer and are designed to operate
with most common refrigerants.
© 2007, Heatcraft Refrigeration Products LLC
OVERVIEW (continued)
As with all Bohn products, extensive testing of the
condenser ensures long and trouble-free service life.
The condensers are designed for outdoor application
with housings available in aluminum nish and painted
or unpainted galvanized steel.
The condensers are available in either single or double
wide fan congurations.
The condenser design incorporates the features most
desired in air-cooled condensers. An extensive list of
options and fan cycle control panels complement the
condenser design and allow the condenser to match the
most rigid application requirements.
The Floating Tube™ Coil Design
Dramatically Reduces Tube Sheet Leaks
FEATURES
Bohn’s latest air-cooled condenser is available in
multiple product tiers and are designed with features to
meet exacting customer requirements.
Bohn Monarch™ Series of Condensers
Customers seeking optimum sound and energy
performance can select the Bohn Monarch Series of
condensers with variable speed EC motor technology.
VSEC motors provide unparalleled sound and energy
performance.
Features include:
• VSEC motor, swept fan blade and venturi
incorporating integrated variable speed technology
• Broad capacity range from 16 to 264 tons
• Aluminum housing for an attractive appearance and
corrosion protection, with painted galvanized steel,
or galvanized steel available as an option
Monarch™ Series with VSEC Motor Technology
3
• Side access panels allow for ease of cleaning
coils
Bohn Ambassador™ Series of Condensers
The Ambassador Series by Bohn is designed
specically with the growing needs of the
supermarket and grocery industry in mind. This series
utilizes 830 and 540 RPM motors and incorporates
advanced features that further improve sound levels and
energy eciencies as well as provide increased capacity
in a smaller footprint. In addition, there are new features
designed to improve serviceability, resulting in reduced
maintenance costs. The Ambassador Series is a perfect
t for applications requiring low sound and energy levels
and optimized capacities.
Features include:
• Direct drive fan motors in 830 or 540 RPM
• The patented QuietEdge™ fan blade provides an
unprecedented sound level of 49.6 dBA (540 RPM @ 10 ft.)
• Bohn’s patented (#7, 210, 661) ServiceEase™ motor
mount feature, allows for ease of motor service and
reduces likelihood of damage to the coils during
servicing
• Bohn condenser coils incorporate the latest
advancements in coil technology to provide
maximum capacity
• Broader product range to address all applications
— capacities ranging from 11 to 225 nominal tons
• Galvanized steel cabinet with the option for
aluminum or painted galvanized steel
• High eciency, three-phase fan motors with ball
bearings and internal overload protection
1140 Series
For customers seeking an economical solution to
their capacity needs, Bohn now oers the 1140 RPM
Bohn's Patented QuietEdge™ Fan Blade for
Improved Sound Performance
Series with enhancements to improve capacity and
serviceability.
Features include:
• Direct drive fan motors
• Bohn’s patented (
mount
• New, high eciency condenser coil designed for
optimum performance
• Expanded product range from 15 to 249 nominal tons
• Galvanized steel as a standard housing, with an option
for aluminum or painted galvanized steel
• High eciency, three-phase fan motors with ball
bearings and internal overload protection
#7, 210, 661) ServiceEase™ motor
All Standard Condensers
• 10 ns per inch spacing
• Modular design with models in both single and
double wide fan congurations
• All Bohn condensers incorporate the Floating Tube™
coil design, which virtually eliminates tube sheet leaks
• Internal baes provided between all fan cells
• Condensers up to 3 fans in length use 3/8” diameter
tube to minimize refrigerant charge. Condensers
4 or more fans in length use 1/2" diameter tube to
minimize refrigerant pressure drop
• Coated steel fan guards
• Weatherproof control panel with factory-mounted
door interrupt disconnect switch
• UL and UL listed for Canada
Available Options:
• Multi-circuiting at no additional charge
• Optional 8, 12 or 14 FPI spacing
• Fan-cycle control panels
• Alternate coil construction including BohnGuard™
coated ns, epoxy or phenolic coated ns and copper ns
• Hinged fan panels for ease of servicing (Ambassador
and 1140 Series only)
• Side access panels
• Extended condenser legs for increased ground clearance
• Sealtite wiring
• Frame for shipping
ServiceEase™ Motor Mount System
4
Three solutions tailored to t your unique needs.
Choose from the Monarch, Ambassador or 1140 Series of air-cooled condensers by
Bohn. Choosing the Monarch Series means you have an unmatched solution for
capacity, sound and energy eciency while the Ambassador Series oers excellence
in capacity, sound and eciency. Bohn continues to oer the 1140 RPM Series to meet
high capacity needs without concerns for low sound and high eciency.
FEATURE 1140 SERIES AMBASSADOR
SERIES
MONARCH
SERIES
Motors
Standard Motor 1140 RPM 830, 540 RPM Variable Speed
EC Motors
P66 Motor Option
a a
(not required)
Cabinet
Standard Cabinet Galvanized Galvanized Aluminum
Galvanized Option (standard) (standard)
Pre-Painted Galvanized Option
Aluminum Option
a a a
a a
a
(standard)
Venturi Cover
Standard Venturi Removeable Removeable EC Tall Optimized
Hinged Option
a a
-
Fan Blades
Standard Blade Standard QuietEdge™ EC Optimized
Motor Mount
Standard Motor Mount ServiceEase™ ServiceEase™ EC Optimized
Warranty
2-Year Warranty
3-Year Warranty — EC Motors - -
5-Year Warranty — Floating Tube™
a a a
a a a
a
5
NOMENCLATURE
B N H – S 04 A 050
B - Bohn
N – Vintage
Motor
H – 1140 RPM, 1.5 HP
L – 830 RPM, 1.5 HP
X – 830 RPM, 1.0 HP
Q – 540 RPM, 0.5 HP
E – Monarch VSEC Motor
Model Identier
Fans
Width
S – Single Wide
D – Double Wide
01-14
Standard Capacity
(MBH/°TD, R-22 @ 10 FPI)
6
Condenser Selection
Capacity for air-cooled condensers are based on Total Heat of Rejection (THR)
at the condenser. Total heat of rejection is equal to net refrigeration at the
evaporator (compressor capacity) plus the energy input into the refrigerant
by the compressor (heat of compression). The heat of compression will
vary depending on the compressor manufacturer, type of compressor
and the operating conditions of the compressor. Whenever possible, it is
recommended that you obtain the heat of compression value from the
compressor manufacturer.
If this is not available, the THR can be estimated using the following formula:
THR = (Compressor Capacity) * (Heat of Compression Factor, Tables 1 & 2)
Table 1 contains heat of compression factors for suction cooled compressors
and Table 2 contains factors for open drive compressors. For refrigeration
systems beyond the range of Tables 1 and 2, use the following equations to
estimate THR:
Open Compressors:
THR = Compressor Capacity (BTUH) + (2545) * (Break Horsepower, BHP)
Suction Cooled Compressors:
THR = Compressor Capacity (BTUH) + (3413 * KW)
The compressor capacity is eected by its altitude. If the condenser location
is above sea level, an additional correction is required to the THR, as follows:
THR (altitude) = THR * Altitude Correction Factor, Table 3
Selection Example
Compressor capacity: 350,000
Evaporator temperature: +25° F
Condensing temperature: 115° F
Ambient temperature 95° F
Refrigerant: R-22
Compressor type: Semi-hermetic, suction cooled
Condenser type: 540 RPM, one row of fans
Condenser altitude: 1,000 feet
THR (MBH) = 476,595 / 1,000 = 476.6
THR (MBH/°TD) = 476.6 / 20 = 23.83
Locate the 10 FPI column for R-22 refrigerant and read down until you locate a
value equal to or just larger than 23.83. This value is 25.9. Read horizontally to
the left to obtain a condenser model of BNQ-S05-A026.
Step 5: Calculate Actual T.D. and Condensing Temperature
The actual condenser T.D. can be calculated by dividing the design THR by
the condenser rating.
Actual T.D. = THR (Design) / (Rating @ 1° T.D.)
= 476.6 / 25.9
= 18.4°F. T.D.
The actual condensing temperature is the actual T.D. plus the ambient
temperature.
Actual Condensing Temperature = (Actual T.D.) + (Ambient)
= 18.4 + 95
= 113.4°F.
Table 1. Heat of Compression Factor for Suction Cooled Compressors.
Suction
Temp. °F
-40° 1.56 1.63 1.72 1.81 1.94
-30° 1.49 1.55 1.62 1.7 1.8
-20° 1.43 1.49 1.55 1.62 1.7
-10° 1.38 1.43 1.49 1.55 1.63
0° 1.34 1.38 1.43 1.49 1.56
5° 1.31 1.36 1.41 1.48 1.55
10° 1.29 1.34 1.39 1.44 1.52
15° 1.26 1.31 1.36 1.41 1.48
20° 1.24 1.28 1.33 1.38 1.44
25° 1.22 1.26 1.31 1.36 1.42
30° 1.2 1.24 1.28 1.33 1.39
40° 1.17 1.2 1.24 1.28 1.33
50° 1.13 1.16 1.2 1.24 1.28
90° 100° 110° 120° 130°
Condensing Temperature °F
Step 1: Estimate Condenser THR
From Table 1 for suction cooled compressors, at +25° F suction and 115° F
condensing temperature, select a heat of compressor factor of 1.335.
THR = Compressor Capacity * Heat of Compression Factor
= 350,000 * 1.335
= 467,250
Step 2: Correct for Altitude
From Table 3 obtain an altitude correction factor of 1.02 for 1,000 feet.
THR = THR (from step 1) * Altitude Correction Factor (design)
= 467,250 * 1.02
= 476,595
Step 3: Calculate Design Condenser T.D.
Design Condenser T.D. = Condensing Temp — Ambient Temp
= 115 - 95
= 20° T.D.
Step 4: Condenser Selection
Condenser capacities for condensers with one row of fans at 540 RPM are
located in Table 6. These capacities are given in MBH/°TD. Convert the THR
calculated in step 2 to MBH/°TD by dividing by 1,000 to get THR in MBH.
Then divide the THR by the design TD to get MBH/°TD.
Table 2. Heat of Compression Factor for Open Drive Compressors.
Evaporator
Temp. °F
-30° 1.37 1.42 1.47 — — —
-20° 1.33 1.37 1.42 1.47 — —
-10° 1.28 1.32 1.37 1.42 1.47 —
0° 1.24 1.28 1.32 1.37 1.41 1.47
5° 1.23 1.26 1.3 1.35 1.39 1.45
10° 1.21 1.24 1.28 1.32 1.36 1.42
15° 1.19 1.22 1.26 1.3 1.34 1.4
20° 1.17 1.2 1.24 1.28 1.32 1.37
25° 1.16 1.19 1.22 1.26 1.3 1.35
30° 1.14 1.17 1.2 1.24 1.27 1.32
40° 1.12 1.15 1.17 1.2 1.23 1.28
50° 1.09 1.12 1.14 1.17 1.2 1.24
90° 100° 110° 120° 130° 140°
Condensing Temperature °F
Table 3. Altitude Correction Factors.
Altitude Correction Factor
0 1
1,000 1.02
2,000 1.05
3,000 1.07
4,000 1.1
5,000 1.12
6,000 1.15
7,000 1.17
7
Multi-Circuiting Selection
Multi-Circuiting Selection Procedure
The air-cooled condensers are available with more than one
refrigerant circuit. The condenser will be factory assembled with the
condenser coil divided into individual refrigerant circuits, each sized
Multi-Circuit Condenser Selection
Given four suction cooled compressors with conditions shown in Table
4. The condenser shall have 830 RPM, 1.0 HP fan motors,
Selection Procedure
Step 1: Input customer data in Table 4 in columns 1, 2, 3, 4
and 5.
Step 2: From Table 1, select the heat of compression factor
for suction cooled compressors and input into
Column #6.
Step 3: From Table 3 obtain the altitude correction factor
and input into Column #7.
Step 4: From Table 5 obtain the refrigerant capacity factor and
input into Column #8.
for its own specic application. Each circuit is supplied with its own
inlet and outlet connections, individually labeled.
with two rows of fans. The condenser location is at 3,000 ft. and the
design ambient is 95°F.
Step 5: Calculate the design T.D. for each circuit by
subtracting the ambient temperature from the circuit
design condensing temperature and input into
Column #9.
T.D. = Design Condensing Temperature - Ambient Temperature
Step 6: Calculate the design THR / °T.D. for each circuit.
Multiply Column #5 by Column #6 and Column #7 to
calculate the THR for each circuit. Divide the result by
the refrigerant correction factor, Column #8 to convert
the capacities to a common refrigerant. Divide the
result by the design T.D., Column #9 to calculate the
design THR / °T.D. and input into Column #10.
Design THR / °T.D. = Compressor Capacity (#5) * Heat of Compressor Factor (#6) x Altitude Factor (#7)
Refrigerant Capacity Factor (#8) * Design T.D. (#9)
Example for Circuit #1:
Design THR / °T.D. = 235,000 * 1.31 * 1.07
1.02 x 15
= 21,529 BTUH / °T.D.
Step 7: Add the design THR / °T.D. for each circuit in column
#10, to get a total of 39,578 BTUH / °T.D. Divide this
total by 1,000 to get 39.6 MBH / °T.D.
Step 8:
830 RPM, 1.0 HP fan motors, locate the column for
R-404A capacity with 10 FPI. Read down the column
until you get to a capacity equal to or greater than 39.6
MBH / °T.D. This value is 44.5 which corresponds to a
BNX-D06-A045. From Table 9 obtain the total
number of feeds available as 56.
From Table 8 for two rows of condenser fans with
8
Multi-Circuiting Condenser
Table 4. Condenser Multi-Circuit Selection
1 2 3 4 5 X 6 X 7 ÷ 8 ÷ 9 = 10 11 12 13
X
Heat of
Com-
press.
Factor
X
Altitude
Factor
÷
Refrig.
Cap.
Factor
Design
÷
Cond.
T.D.
TOTAL = 39,578 56
39,578 / 1,000 = 39.6 MBH/°TD
=
Design
THR/°TD
No. of
Feeds
Per Circ.
Actual
Cond.
Circuit
Name
Evap.
Temp.°F
1 25 110 22 235,000 X 1.31 X 1.07 ÷ 1.02 ÷ 15 = 21,529 31 13.1 108.1
2 20 110 134a 61,000 X 1.33 X 1.07 ÷ .97 ÷ 15 = 5,966 8 14.1 109.1
3 -10 105 22 31,000 X 1.46 X 1.07 ÷ 1.02 ÷ 10 = 4,748 7 8.5 103.5
4 -20 105 22 46,000 X 1.52 X 1.07 ÷ 1.02 ÷ 10 = 7,335 10 9.2 104.2
Design
Cond.
Temp.°F
Comp.
Refrig.
Type
Cap.
BTUH
Step 9: Determine the number of feeds per circuit. Divide the design THR / °T.D. in Column #10 by the total capacity required (39,578) and
multiply this result by the number of feeds available, which is 56. Round this value to the nearest integer and place in Column #11
Add the individual feeds per circuit to get a total number of feeds for the condenser. This total must equal the total number of
feeds available for the condenser (56).
T.D.
Actual
Cond.
Temp.
°F
Number of = Design THR / °T.D.(#10) * Number of Circuits Available (56)
feeds/circuit Total Capacity Required (39,578)
Step 10: Calculate actual condensing T.D., (ATD):
ATD = Design T.D. (#9) * Design THR/°T.D. (#10) * Number of Feeds Available (56)
Number Feeds / CIR (#11) * Condenser Capacity / °T.D. (Step #8) * 1,000
Example for Circuit #1:
ATD = 15 * 21,529 x 56
= 13.1°F.
31 * 44.5 * 1,000
Input these T.D. values in column #12.
Step 11: Calculate the actual condensing temperature. Actual condensing temperature is equal to the actual condensing T.D., Column #12
plus the design ambient (95°). Input these values in Column #13. If the actual condensing temperature for each circuit is too high,
it may be necessary to adjust the number of feeds per circuit or to select the next larger condenser size and recalculate the number
of feeds per circuit.
Table 5. Refrigerant Capacity Factor.
Refrigerant Capacity Factor
R-22 1.02
R-134a 0.97
R-404A 1
R-410A 1.02
R-507 1
9
CONDENSER CAPACITY
BNQ 540 830 VSEC 1140
Ambassador Series
Table 6. Ambassador BNQ Models, 540 RPM, 0.5 HP, 30” Fan Diameter
R-22 | R-410A
MBH / 1° TD
Model
BNQ-S01-A005
BNQ-S01-A006
BNQ-S02-A008
BNQ-S02-A010
BNQ-S02-A011
BNQ-S03-A016
BNQ-S03-A017
BNQ-S04-A021
BNQ-S04-A023
8 FPI
4.6 5.2 5.6 5.9 4.6 5.1 5.5 5.8
5.5 6.1 6.4 6.6 5.4 5.9 6.2 6.5
7.2 8.0 8.7 9.1 7.0 7.8 8.5 8.9
9.4 10.3 10.8 11.8 9.2 10.1 10.6 11.6
10.8 11.5 11.9 12.3 10.6 11.2 11.7 12.0
14.1 15.6 16.2 16.9 13.8 15.2 15.9 16.6
16.2 17.2 17.9 19.8 15.9 16.9 17.5 19.4
18.8 20.7 21.6 23.5 18.4 20.3 21.2 23.0
21.6 22.9 23.8 24.5 21.2 22.4 23.3 24.0
10 FPI 12 FPI 14 FPI 8 FPI 10 FPI 12 FPI 14 FPI
R-404A
MBH / 1° TD
BNQ-S05-A026
BNQ-S05-A029
BNQ-S06-A034
BNQ-S07-A042
BNQ-D04-A016
BNQ-D04-A021
BNQ-D04-A023
BNQ-D06-A031
BNQ-D06-A034
BNQ-D08-A041
BNQ-D08-A046
BNQ-D10-A052
BNQ-D10-A057
23.5 25.9 27.0 29.3 23.1 25.4 26.4 28.8
27.0 28.6 29.8 30.7 26.5 28.1 29.2 30.1
32.4 34.4 35.7 36.8 31.8 33.7 35.0 36.1
38.4 41.6 42.8 44.3 37.7 40.7 41.9 43.4
14.3 16.0 17.3 18.2 14.0 15.6 16.9 17.9
18.8 20.7 21.6 23.6 18.4 20.3 21.2 23.2
21.6 22.9 23.8 24.5 21.2 22.4 23.3 24.0
28.2 31.0 32.4 33.8 27.6 30.4 31.8 33.1
32.4 34.4 35.7 39.5 31.8 33.7 35.0 38.7
37.6 41.4 43.2 47.0 36.9 40.6 42.3 46.1
43.2 45.8 47.6 49.0 42.4 44.9 46.7 48.1
47.0 51.8 54.0 58.7 46.1 50.7 52.9 57.5
54.0 57.3 59.5 61.3 53.0 56.1 58.3 60.1
BNQ-D12-A069
BNQ-D14-A083
BOLD
indicates standard model capacity.
64.8 68.7 71.4 73.6 63.6 67.3 70.0 72.1
76.8 83.1 85.5 88.6 75.3 81.5 83.8 86.8
10
Loading...