Russell’s Remote Air Cooled Condensers are designed to provide a wide array of solutions focusing on performance, energy
efficiency, reduced sound output and other requirements of today’s demanding marketplace. Working closely with market leading
customers to solve real world problems, Russell incorporates the wisdom of lessons learned into its design philosophies resulting in
products that exceed the needs of the grocery, supermarket, industrial cooling and commercial warehousing industries.
I. Model SeriesIX. Coil Material and Coating Options
R – Russell 1 – Aluminum fins (Al)
II. Unit type3 – Al + AST coating
D – Condenser4 – Al + Blygold
III. Series 6 – Al + Heresite
S – Single fan wide7 – Al + Polyester coat - Pre Coated Fin Material
D – Double fan wideX – Other
IV. Capacity – Three Number CharactersX. Housing Material and Coatings
V. Voltage Code2 – Galvanized
A – 115/1/60M – 200-220/1/504 – Pueblo Tan pre-paint
D – 208-230/1/60N – 200-220/3/507 - Stainless Steel 316L
E – 208-230/3/60P – 380/1/50X – Other
F – 460/1/60Q – 380/3/50
G – 460V/3/60T – 380/3/60 XI. Unit Design Configuration
H – 575/1/60X – OtherA – Vertical Fan Discharge, Standard Legs
J – 575V/3/60B– Vertical Fan Discharge Floating Coil, Standard Legs
VI. Motor/Fan Type D– Vertical Fan Discharge Floating Coil, Legs at every location
A – 1140 RPM, 0.33 HP, Metal BladeE – Vertical Fan Discharge,30” Extended Legs
B – 1140 RPM, 1.5 HP, Metal BladeF– Vertical Fan Discharge Floating Coil, 30” Extended Legs
C – 850 RPM, 0.25 HP, Metal BladeG – Vertical Fan Discharge,48” Extended Legs
D – 850 RPM, 1.5 HP, Metal BladeH– Vertical Fan Discharge Floating Coil, 48” Extended Legs
E – 550 RPM, 1/3 HP, Metal BladeJ – Vertical Fan Discharge,60” Extended Legs
F – 550 RPM, 1/3 HP, FB2K– Vertical Fan Discharge Floating Coil, 60” Extended Legs
G – 900 RPM, 1.5 HP, Variable Speed EC Motor and Fan AssemblyL – Vertical Fan Discharge,72” Extended Legs
H –1140 RPM, 0.5 HP Totally Enclosed, Metal BladeM – Vertical Fan Discharge Floating Coil, 72” Extended Legs
J – 1140 RPM, 1.5 HP Totally Enclosed, Metal BladeN – Horizontal Fan Discharge,
L – 850 RPM, 1.0 HP, Metal BladeP – Horizontal Fan Discharge, Floating Coil
X – OtherQ – Vertical Fan Discharge, 21” Extended Legs
VII. Length in Fans – A number between 1 and 7 S – Vertical Fan Discharge, 21" Legs at every location
VIII. Coil Density XII. Circuit Splitting Options
A – 8 fpi1 – Full
B – 10 fpi2 – 50-50
C – 12 fpi3 – 50-25-25
D – 14 fpi4 – 25-25-25-25
X – OtherX – Other
2 – Copper fins (Cu)
Post Coat
5 – Al + Bronze Glow
1 – Aluminum
C – Vertical Fan Discharge, Legs at every location
R– Vertical Fan Discharge Floating Coil, 21” Extended Legs
T– Vertical Fan Discharge Floating Coil, 21" Legs at every location
X – Other
XIII. Revision Code – Single Alphanumeric Character
A – Initial Release
Materials
Page 3
3
Standard and Optional Features
DESCRIPTION
General Construction and Configuration
Vertical Air Discharge ConfigurationDStdStd
Horizontal Air Discharge ConfigurationD,GOptOpt
Galvanized Steel Frame and CasingStdStd
Aluminum CasingOptOpt
White painted Galvanized Steel CasingOptOpt
Pueblo Tan pre-paint Galvanized Steel CasingOptOpt
AST Coated Galvanized CasingOptOpt
Stainless Steel 304 CasingOptOpt
Stainless Steel 316 CasingOptOpt
Heavy Gauge Galvanized Steel Legs (Vert. Disch):Leg Length15" (Std)18" (Std)
Condenser Coil
Heavy Gauge Aluminum Tube SheetsStdStd
Copper Tubes Mechanically Expanded into Aluminum FinsStdStd
Special Fin Materials: Copper Fin StockOptOpt
Aluminum Fins with AST ElectroFin
Floating coil designOptOpt
Multi-Sectioning (No extra Charge)BOptOpt
Sub-Cooling Circuits (No extra Charge)OptOpt
Fan Section
6-Pole (1140 RPM), 1-Phase or 3-Phase Fan Motors:Open TypeEStdStd
8-Pole (850 RPM), 1-Phase or 3-Phase Fan MotorsOpen TypeFOptOpt
Variable-Speed Fan Motors on Header End - See Control Panel OptionsCOptOpt
Fan Motor Mounting: Welded heavy gauge rod mounting framesGStdStd
Models with Motor code G include Variable Speed EC motor and fan assembliesN/AStd
Fully Baffled Fan ModulesStdStd
Flip Top' Hinged Fan Panels - Access for Coil Cleaning and Fan/Motor ServiceGOptOpt
Side Access Panels - for Ease of Coil CleaningN/AOpt
Gravity DampersGOptOpt
Control Panel
Mounting Location:Opposite Header EndStdStd
Temp. or Press. Fan Cycling - Individual or Paired-Fan Contactors (Must specify)GOptOpt
Custom Fan Cycling Wiring and LogicOptOpt
Variable Speed Control:Penn P-66 Pressure ControlledC, GOptOpt
Output Relay Boards for Computerized Fan Cycling (Computer control by others)OptOpt
Analog output board (for units with Variable Speed EC motors)OptOpt
Motor Fusing - Individually or in PairsOptOpt
Circuit BreakersOptOpt
Fan Control Circuit Toggle SwitchesOptOpt
Control TransformerOptOpt
Fused or Non-Fused Disconnect Switch (Mounted)OptOpt
VFD - Not available for models with Variable Speed EC Motors
Refrigerant Specialties
Flooded-Condenser Control Valve SystemOptOpt
Field Manifold Kit
Shipping
Vertical Discharge Models
Small Style Condensers DSee note DN/A
Large Style Condensers - Legs collapsed for shipping, must extend during installationN/AStd
Horizontal Discharge Models
Legs Disassembled - Unit is Cartoned or CratedDSee note DStd
Notes:
A. Contact factory
B. All double fan-width units are two-section as standard. Requires field manifold kit for single-section operation.
C. Header-End (lead fans) only.
D. Legs are disassembled for small condenser models. Units are shipped in carton or crate. Models thru size 011 can be mounted in either horizontal
or vertical configuration depending on method of leg assembly. Consideration must be given to the electrical box when mounted for horizontal air discharge.
Large style condensers must be special ordered for use in horizontal discharge arrangement.
E. 1140 RPM Single phase motors available for sizes up to 022 only.
F. 850 RPM single phase motors available for small condensers thru size 009 only.
G. Not available for units with EC motors
Polyester-Coated Fin StockOptOpt
TM
, Heresite, Bronze Glow or Blygold Coated Coils
Header end, Left or Right SideOptOpt
21", 30", 48", 60" or 72" AN/AOpt
Totally EnclosedEOptOpt
Notes Small Models Large Models
BOptOpt
UNIT MODEL
001 to 011008 to 250
OptOpt
Page 4
SELECTION EXAMPLE
Given:
Ambient Air Temperature = 95° F
Maximum Condensing Temperature = 110° F
Evaporator Temperature = 20° F
Refrigerant = R-404A
Compressor Capacity = 290,000 BTU
Compressor Type = Suction Cooled Semi-Hermetic
Solution:
Multiply the compressor capacity by the heat of compression factor to calculate the required total heat of rejection (THR). Table 1 shows that for 110°F
condensing temperature and 20° F evaporator temperature, the heat of compression factor is 1.33. The required total heat rejection (THR) is:
290,000 x 1.33 = 385,700 BTUH THR
Divide the BTUH THR by the design condensing temperature of 15°F TD. (TD = Condensing Temperature - Ambient Temperature)
385,700 ÷ 15 = 25,713 BTUH per 1°F TD
Convert BTUH to MBH.
25,713 BTUH ÷ 1000 = 25.713 MBH per 1°F TD
The correct selection of a single fan width unit with 1140 RPM fan motors (page 12) is a model RDS048*B3 with a capacity of 26.0 MBH @ 10FPI.
Since the unit selection will almost never have the exact required capacity, the actual TD will vary slightly from the design TD. The actual TD can be
calculated using the following formula:
Actual TD =
Design THR
x Design TD
Actual Condenser THR
For this example the actual TD would be:
Actual TD =
25.7
x 15 = 14.8°F TD
26.0
Condenser Selection
Air-cooled condenser capacity ratings are based on the total heat rejection of the refrigeration system. Total heat of rejection is the sum of the net
refrigeration effect and heat of compression added to the refrigerant in the compressor.
The heat of compression varies with the compressor design, so the compressor manufacturer's information should be used whenever possible. If the
compressor manufacturer's heat of compression information is not available, Tables 1 and 2 (page 5) may be used to determine the heat of compression.
The following formulas may be used to calculate the total heat rejection (THR) for systems that fall outside the normal limits of single stage compressor
applications, such as compound or cascade systems.
Suction cooled hermetic compressors:
THR = Compressor Capacity (BTUH) + (3413 x KW)
Open Compressors
THR =Compressor Capacity (BTUH) + (2545 x BHP)
ELEVATION CORRECTION
Elevation above sea level has an effect on the performance of air cooled condensers. Divide the required capacity by the Elevation Correction Factor in
the table on page 5 to correct the requirement to Sea Level Conditions. The proper condenser can then be selected from the appropriate table on Pages
10,12,14,16 or 18.
SINGLE SECTION CONDENSERS
All units are available for single section applications. All double fan width units are furnished with dual section coils and can be converted in the field for
single section installations.
Air-cooled condensers with more than one section are available for applications where multiple refrigeration systems are connected to the same
condenser. Multi-sectioning, except for small condensers, is covered in this section.
The condenser coil is divided into the proper number of sections and each section is supplied with an inlet and outlet connection. Each section is tagged
for identification. When ordering, the sections must be placed in numerical sequence. The sections will be arranged in sequence with the number one
section being on the left end when facing the header end of the unit.
Example: Multi-Section Condenser Selection
Given:
Refer to Table 4, the Multi-Section Calculation Form below. Four suction cooled semi-hermetic compressors are shown with their operating conditions.
Design ambient temperature is 95° F.
Procedure:
1. Complete the customer data in columns 1 through 6 in Table 4.
2. Fill in the heat of compression factors in column 7. If the compressor manufacturer's data is not available, use values from tables 1 and 2.
3. Multiply the values in column 6 by the values in column 7 and tabulate the results in column 8.
4. Next, divide the heat rejection values in column 8 by the design TD values in column 3 and enter the results in column 9.
5. Add all of the items in column 9 to obtain the total MBH required at 1° F TD. Use this value and the procedure on Page 4 to select
the proper condenser model. For this example, the total MBH is 25.64. Therefore, the unit with 1140 RPM fan motors and
double fan-width configuration, having enough capacity to meet this requirement, is an RDD041*B2 with 14 FPI.
6. MBH per face tube values can be found by dividing the unit’s capacity, found in the performance data tables, by the number of face tubes listed
in Table 5. Be sure to apply the corresponding correction factors for refrigerants other than R-404A or R-407A. Enter the MBH per face tube value
in column 10.
For Sections No. 1 & 2 in Table 4, the unit’s capacity can be found by multiplying the R-22 correction factor (1.02) by the value in the R-404A table (26.1)
on page 12. Divide this capacity by the number of face tubes available for the RDD041*B2 listed in Table 5.
MBH per face tube = = 0.370
7. To determine the number of face tubes required for each section, divide column 9 by column 10 and enter the results in column 11.
8. Each section's number of face tubes in column 11 is a mathematical value and must be rounded off to a whole number and entered into column 12.
Round each number off such that the section size assigned to each system is no smaller than 10% undersized.
9. Total the values in column 12. The sum must equal the number of face tubes available for the RDD041*B2 as shown in Table 5. If it does not, one
or more of the column 12 numbers will have to be adjusted so the sum does equal the available face tubes.
10. The actual TD in each coil section may vary slightly from the design TD. The actual TD can be calculated using the following formula:
Head Pressure Control Options and Refrigerant Charge Calculations
Flooded Condenser
The Flooded Condenser Head Pressure Control Option maintains adequate condensing pressure while operating in low ambient temperatures. By
flooding the condenser with liquid refrigerant, the amount of coil surface available for condensing is reduced. The resulting reduction in capacity ensures
proper operation of the thermal expansion valve.
This option requires a modulating three-way valve, dependent on refrigerant discharge pressure, be placed at the condenser outlet. A fall in ambient
temperature causes a corresponding fall in discharge pressure. The valve modulates allowing discharge gas to flow to the receiver, creating a higher
pressure at the condenser outlet. This higher pressure reduces the flow out of the condenser, causing liquid refrigerant to back up in the coil. Flooding
the condenser reduces the available condensing surface and raises the condensing pressure so that adequate high-side pressure is maintained.
A larger receiver and additional refrigerant are required for systems with flooded condenser control. The receiver can be conveniently installed directly
under the condenser in most applications. However, if the system will be operational in ambient temperatures below 55° F, the receiver should be
located in a warm environment or heated. In this situation, a check valve must be installed in the line between the receiver and expansion valve. This
prevents refrigerant migration from the receiver to the condenser.
The amount of additional refrigerant charge is based on the lowest expected winter operating temperature and the design TD. In addition to the
condenser charge, the operating charges of the evaporator, receiver and refrigerant lines must be added to determine the total system refrigerant
charge. The pump-down capacity (80% of full capacity) of the receiver must be at least equal to the total system charge.
Table 5 shows the standard summer charge when using R-404A. The additional charge required for flooded condenser operation with a design TD of
15°F is also shown. Additional charge for alternate design TDs can be found using the correction factors in Table 6.
Example: Single Section Unit with Flooded Condenser Head Pressure Control
Given:
An RDD055*B Condenser with an R-404A summer charge of 24.4 lbs. (See Table 5) has a design TD of 10° F and will operate at a minimum ambient of
0° F.
Solution:
The additional charge needed to operate at 0° F can be found in Table 5 (63.3 lbs.). Because the unit has a design TD of 10° F, the additional charge
must be multiplied by a correction factor of 1.04 as shown in Table 6. Therefore, the required additional charge is 63.3 × 1.04 = 65.8 lbs. The total
operating charge for a minimum ambient of 0° F and a 10° design TD is 24.4 + 65.8 = 90.2 lbs.
Example: Multi-Section Unit with Flooded Condenser Head Pressure Control
Given:
An RDS017 condenser split into two sections. One section has 22 face tubes of R-404A at a 10° TD and the other section has 14 face tubes of R-22 at
a 15° TD. The unit will operate at a minimum ambient of 20° F.
Solution:
To calculate the winter charge for each section, the summer charge and additional charge for low ambient must be found. The summer charge can be
calculated by multiplying the number of face tubes in the section by the charge per face tube value in Table 5. Next, divide the number of face tubes in
the section by the total number of face tubes and multiply by the additional charge required for a minimum ambient of 20° F. Make sure to apply correction factors for design TDs other than 15° and for refrigerants other than R-404A or R-507. Adding the summer charge and additional charge for low
ambient will yield the total winter charge.
For the R-404A section, the summer charge is 22 tubes × 0.23 lbs. per face tube = 5.06 lbs. The additional charge equals the ratio of tubes in the
section to total tubes times the additional charge at 20° F with a 15° F TD times the TD correction factor from Table 6, or 22/36 × 19.1 × 1.05 = 12.26 lbs.
The winter charge is 5.06 + 12.26 = 17.32 lbs.
For the R-22 section, the summer charge must be multiplied by a refrigerant correction factor of 1.13 as seen in the Table 5 footnotes. The summer
charge is 14 × 0.23 × 1.13 = 3.64 lbs. The additional charge calculation also requires the use of the correction factor. The additional charge is
14/36 × 19.1 × 1.13 = 8.39 lbs. The winter charge is 3.64 + 8.39 = 12.02 lbs.
7
Page 8
Table 5: Additional Refrigerant Charge for Flooded Condensers
† Based on 90°F Condensing Temperature
* For R-22 multiply by 1.13
* For R-134A multiply by 1.15
* For R-410A multiply by 1.02
* For R407A or R407C, multiply by 1.09
Fan Cycling Control Option
The cycling of condenser fans provides an automatic means of maintaining condensing pressure control at low ambient air temperature conditions. It
also results in substantial fan motor power savings in lower ambient. Temperature sensing thermostats or pressure controls determine whether the
motor is on or off. The minimum ambient temperatures for units with the Fan Cycling Control Option can be found in Table 7.
The Fan Cycling Control Option consists of a weatherproof enclosure, fan contactors, and either ambient thermostat(s) or pressure control(s). The enclosure is factory mounted and completely factory wired. Power must be supplied from a fused disconnect switch to the power circuit terminal block; control circuit power must be supplied to the control terminal block.
Table 8 shows the recommended temperature set points for the thermostats. Thermostat 1 is for the second fan from the header end, Thermostat 2 for
the third fan from the header end, etc. The fan(s) nearest the header end must run continuously, and cannot be cycled.
Fan Speed Control Option - Available only with Fan Cycling Control Option
Designed to enhance the performance of the Fan Cycling Control Option by reducing the RPM and air volume of the lead (header end) fan motor(s) after
all other (lag) fans have cycled off. The lead fan(s) must run continuously, even in the lowest ambient temperature. By reducing their CFM, adequate
head pressure can be maintained at lower ambient temperatures without resorting to flooded condenser head pressure controls. This option includes a
Johnson P66 or P266 Speed Controller, 24 volt transformer, single phase fan motor and pressure line piped from the last return bend in the circuit opposite the header end to the speed control. Double fan-width models require two controllers for the two lead fan motors. All components are factory
mounted and wired. Controller decreases fan motor RPM as head pressure decreases. See Table 7 for minimum ambient temperatures for units with
both the Fan Cycling Control Option and Fan Speed Control Option.
Condensers with Variable Speed Electronically Commutated (VSEC) motors provide quiet
and highly efficient condenser operation. While maximum performance is required to meet
peak daytime demands, lower speed and lower noise levels characterize off-peak and
night time conditions.
Utilizing state of the art programmable VSEC fan motor assemblies, these condensers
provide the flexibility to meet these challenging requirements while delivering quiet, energy
efficient and trouble free operation.
For R-22 capacity, multiply R404A unit capacity by 1.02 Temperature which is the average of the Dew
For R-410A capacity, multiply R404A unit capacity by 1.08Point and Bubble Point temperatures corresponding
For R-134 capacity multiply R-404A unit capacity by .97to the refrigerant temperature at the condenser inlet.
For R-407C capacity, multiply R407A capacity by .98
For R-22 capacity, multiply R404A unit capacity by 1.02
For R-410A capacity, multiply R404A unit capacity by 1.08Point and Bubble Point temperatures corresponding
For R-134 capacity multiply R-404A unit capacity by .97to the refrigerant temperature at the condenser inlet.
For R-407C capacity, multiply R407A capacity by .98
18.621.123.124.8
26.229.131.232.8
32.335.036.838.7
39.043.646.349.2
48.652.755.459.1
52.458.262.465.5
63.869.773.677.4
69.075.780.884.4
85.191.595.7100.1
101.7109.4112.1119.5
118.7127.6130.8139.4
Note: R-407A Ratings are based on Mean
Temperature which is the average of the Dew
For R-22 capacity, multiply R404A unit capacity by 1.02
For R-410A capacity, multiply R404A unit capacity by 1.08
For R-134 capacity multiply R-404A unit capacity by .97
For R-407C capacity, multiply R407A capacity by .98
16.819.020.822.4
24.727.428.529.3
29.431.032.531.6
37.140.742.845.6
44.147.950.353.9
49.454.957.159.0
58.863.965.370.6
62.468.472.075.0
79.385.388.891.1
95.2102.3106.9109.4
111.1119.4124.7127.6
Note: R-407A Ratings are based on Mean Condensing
Temperature which is the average of the Dew
Point and Bubble Point temperatures corresponding
to the refrigerant temperature at the condenser inlet.
RDD194*L7B12A2A97.9104.8108.2111.1
* voltage code place holder
For R-22 capacity, multiply R404A unit capacity by 1.02 Temperature which is the average of the Dew
For R-410A capacity, multiply R404A unit capacity by 1.08Point and Bubble Point temperatures corresponding
For R-134 capacity multiply R-404A unit capacity by .97to the refrigerant temperature at the condenser inlet.
For R-407C capacity, multiply R407A capacity by .98
For R-22 capacity, multiply R404A unit capacity by 1.02
For R-410A capacity, multiply R404A unit capacity by 1.08Point and Bubble Point temperatures corresponding
For R-134 capacity multiply R-404A unit capacity by .97to the refrigerant temperature at the condenser inlet.
For R-407C capacity, multiply R407A capacity by .98