• Large orifice prevents clogging (no movingparts).
• Redesigned nozzles for superior water distribution.
• Threaded nozzles eliminate troublesomegrommets.
• Fixed position require zero maintenance.
• Threaded end caps for ease of cleaning.
• Guaranteed for life.
About EVAPCO
Evapco is the global innovator in heat transfer
solutions. Our pledge is to make everyday
life easier, more comfortable, more reliable,
and more sustainable for people everywhere.
With manufacturing facilities and sales offices
in more than 40 countries and 28 patents
worldwide in the last 10 years alone—we are
the team that engineers and contractors
know they can count on for life.
Contact
your local Evapco Representative
or visit evapco.com to learn more.
2
Thermal Pak®II Heat Transfer Technology
• More surface area per plan area than
competitive designs.
• Improved heat transfer efficiency due totubegeometry
and orientation of tubes.
• Lower refrigerant charge.
• Optional 304L or 316L TITAN stainlesssteelcoiltechnology.
Improved Water Distribution Piping
• Horizontally mounted pumps allow forreduced
basin water level.*
• Simplified piping for easier basin access.
• Totally enclosed pump motors assure long,
trouble-free life.
*Refer to engineering data for availability.
Optional
Super Low Sound Fan
(Shown in Photograph)
• Extremely wide chord fan
blades for sound sensitive
applications.
• One piece molded heavy duty
construction.
• 10-13 dB(A) sound reduction on
fan side at 50 ft.
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The industry standard for forced draft axial fan condensers. The PMC-E is equipped with
owner-oriented features and benefits that make it Easy
• Increased flexibility for improved capacity control.
• Greater reliability through redundancy.
• Easy motor replacement.
• Front mounted drives for improved maintenance accessibility.
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PMC-E Design Features
ST AND ARD!SSTSTASTANSTANDSTANDASTANDA RSTANDA R DSTANDA R D!STANDARD!
Proven Performance & Design Flexibility
The PMC-E Evaporative Condenser offers more capacity and greater system
design flexibility than ever before. EVAPCO's research and development
team has invested hundreds of hours in laboratory testing to develop the
next generation in Forced Draft Condenser Technology. These efforts have
produced an efficient fan section design combined with the proven Thermal-
®
coil technology to offer improved condenser performance.
Pak II
The PMC-E features more plan area options and fan horsepower options for
the system design engineer. With more condenser capacity, more plan area
options and greater flexibility in motor selection, the design engineer can
now match the condenser performance to the specific application requirements. More equipment choices and more design flexibility mean greater
value for the End-User.
Thermal-Pak II®Coil Design
Lower Refrigerant Charge
Only EVAPCO condensers offer the unique Thermal-Pak II
operating efficiency in your condenser. Its unique elliptical tube design allows for closer
tube spacing resulting in more surface area per plan area than traditional round tube
designs. The Thermal-Pak II
greater water loading, making the Thermal-Pak II®Coil the most efficient design available
and yields a low refrigerant charge.
®
Coil design has lower resistance to air flow and permits
®
Coil which assures greater
Thermal-Pak II®Coil by EVAPCO
Energy Efficient for Lowest Operating Cost
Lower Horsepower Options
The fan drive system of the PMC-E utilizes large diameter vane-axial fans in a two stage arrangement to provide more
efficient air flow and reduced power consumption. When compared to the traditional centrifugal fan condenser models,
the vane-axial fan design can offer up to a 50% reduction in energy consumption. And, with the new PMC-E model
selections even more low horsepower options are available to obtain greater energy savings
Round Tube Coil by Others
.
Individual Fan Drive System
Capacity Control Flexibility & Operating Redundancy
The PMC-E fan drive system provides individual motor to fan configuration as
standard equipment on all models. The dedicated fan to motor arrangement ensures
less “wear & tear” on the drive system versus tandem fan motor drive arrangements
resulting in less maintenance. The individual motor to fan design offers greater
capacity control flexibility to match the system load requirements. In addition, all
Evapco condensers are equipped with an internal baffle system which extends from
the pan bottom vertically through the coil bundle. This unique design allows the user
to cycle fan motors independently without harmful effects of air by-pass inside the
unit. The individual motor to fan design ensures maximum operating redundancy in
the condenser fan system when critical operation is necessary. The PMC-E comes
standard with a 5 Year motor and drive warranty.
Inverter Duty Motors
Inverter Duty motors are standard on PMC-E Condensers. Inverter Duty motors are totally enclosed, premium efficiency and
inverter capable (VFD by others).
Note: Variable Frequency Drive control may require other component modification such as motor shaft grounding
brushes, AC load reactors, low pass filters and tuned trap filters to ensure proper motor performance and service life.
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Page 5
PMC-E Design Features
Overlay
Sealant
Anti-Leak
Sealer Strip
Integral
Compression
Shim
Easy Field Assembly
Fewer Fasteners
Lower Installed Cost
The PMC-E features a field seam design which ensures easier assembly and fewer
field seam leaks. The field seam incorporates self-guiding channels to guide the
coil casing section into position and set in place on the bottom fan section of the
condenser. In addition, the design eliminates up to 85% of the required fasteners
typically used to join the condenser sections in the field significantly reducing the
contractor labor costs for installation.
Improved Maintenance
Fan Drive Accessibility
The drive components of the PMC-E are easily accessed for routine maintenance from the front of the unit. Bearing
grease fittings are extended to the outside of the unit for ease of lubrication. All drive sheaves have been relocated to
the front of the fan section and motors are positioned on a platform base to allow for easy belt tension adjustment.
Easy Clean Sloped Basin
The PMC-E basin is designed to improve maintenance access and make
it easier for operating technicians to clean. The bottom of the pan is
sloped to the unit drain to ensure that the basin will completely drain
and allow sediment and debris that may collect in the basin to be easily
flushed from the unit. The design helps to prevent buildup of
sedimentary deposits, biological films and standing water. In addition,
Evapco offers a special “man-sized” access door option to improve
access to this critical area of the unit.
Construction Features
Unique Seam Design–Eliminate Field Leaks
The PMC-E features Evapco's unique panel construction design which includes a
special butyl tape sealer with an integral sealing gasket. Each joint is then backed
with a secondary caulking compound and encased in a double-brake flange for
added strength and structural integrity. This unique sealing system has been
proven effective in both laboratory tests and years of field application.
Superior Water Saver Drift Eliminators
The PMC-E condensers incorporate a patented* highly efficient PVC drift
eliminator. The eliminator removes entrained water droplets from the air stream
to limit the drift rate to less than 0.001% of the recirculating water rate. With a
low drift rate, PMC-E condensers save valuable water and water treatment
chemicals. The eliminators feature a honeycomb design which offers greater
structural integrity and are recessed in the top of the casing and UV protected
for longer life. They are constructed of inert polyvinyl chloride (PVC) which
eliminates corrosion in this critical area of the condenser. The eliminators are
assembled in sections for easy handling and removal for coil and water
distribution system inspection.
*U.S. Patent No. 6315804
5
Page 6
IBC Compliance
32+
Highest Hazard
Lowest Hazard
%g
24-32
16-24
8-16
4-8
2-4
0-2
IBC Compliance
EVAPCO has been applying advanced structural technology to
evaporative condensers for many years. Following seismic
events in the mid 1990’s EVAPCO introduced the UB Series of
nduced draft cooling towers, fluid coolers and evaporative
i
condensers. These products were designed, built and
independently certified for extreme seismic and wind forces.
With the advent of the International Building Code, EVAPCO is
offering the PMC-E Evaporative Condensers that are IBC
2006 compliant as standard construction.
International Building Code
The International Building Code (IBC) is a comprehensive set
of regulations addressing the structural design and installation
requirements for building systems – including HVAC and
industrial refrigeration equipment. As of June 2008, all 50
states plus Washington D.C have adopted the International
Building Code. Compared to previous building codes that
solely examined anchorage, the earthquake provisions
contained within the International Building Code address
anchorage, structural integrity, and operational capability of a
component following a seismic event. The goal of the IBC is
to minimize the loss of life and improve the capability of
essential facilities to operate after a seismic event.
The International Building Code (IBC) was developed to
replace the BOCA National Building Code, ICBO’s UniformBuilding Code and SBCCI’s Standard Building Code. The
International Building Code specifies that all components be
designed to resist the equivalent seismic forces as the
structure to which they are installed whereas previous building
codes focused exclusively on the structure of the building to
provide resistance against seismic forces. These components
include all aspects of the building architectural, electrical and
mechanical systems. The failure of these components during a
seismic event has been a common occurrence in recent
history. Although the structure of the building may be
relatively undamaged from an earthquake, the damage to the
nonstructural components could be significant and result in
considerable secondary damage to the building (ie. flooding,
fire, structural damage).
forces prescribed in the code. Simply stated, the code
provisions require that evaporative cooling equipment and all
other components permanently installed on a structure must
meet the same seismic design criteria as the building.
The seismic design force, utilized for component design,
represents an equivalent static force that is applied to the
components’ center of gravity as described in the following
equation:
Fp= Seismic Design Force centered at the component’s
center of gravity
S
= Design spectral response acceleration, short period
S
D
a
= Component amplification factor
p
I
= Component importance factor
p
W
= Component operating weight
p
R
= Component response modification factor
p
z = Height in structure of point of attachment of
component with respect to the base
h = Average roof height of structure with respect to
the base
The minimum and maximum design force limits are specified as:
Fp-min = 0.3 SDS IpW
Fp-max = 1.6 SDS IpW
p
p
A series of charts and graphs are used to determine the
appropriate factors based on the location of the installation
and ultimately the “importance” of the facility. A chart of the
potential seismic activity in the United States is shown below.
Seismic Design
The IBC specifies that all installed components must meet the
requirements of ASCE 7-05 (American Society of Civil
Engineers, Minimum Design Loads for Buildings and OtherStructures). Exemptions noted in the code are for all
mechanical components assigned to seismic design categories
A or B. ASCE 7-05 explicitly states that in addition to the
attachment and supports, the component itself must be
designed to withstand the seismic
6
Map courtesy US Geological Survey website
Page 7
IBC Compliance
Certificate of Compliance
AT, USS, UAT, UT Cooling Towers
eco-ATWB/WB-E, ATWB and ESWA Closed Circuit Coolers
eco-ATCA, ATC-E and PHC Evaporative Condensers
Are certified to meet or exceed the Seismic and Wind Load Provisions
set forth in the applicable building codes for this project.
These products have been manufactured following all
applicable quality assurance programs.
Applicable Building Codes:
IBC 2012
ASCE-7
NFPA 5000
Approval Ag enc y:
Tobolski Watkins Engineering, Inc.
EVAPCO...Specialists in Heat Transfer Products and Services.
Seismic and Wind Load Certification
AT, USS, UAT, UT Cooling Towers
eco-ATWB/WB-E, ATWB and ESWA Closed Circuit Coolers
eco-ATCA, ATC-E and PHC Evaporative Condensers
Units Designed and Manufactured to Meet the
Seismic & Wind Load Requirements of:
IBC 2012 ASCE-7 NFPA 5000
Independent Certification By:
Tobolski Watkins Engineering, Inc.
Importance Factor (Ip)
A major parameter that must be determined prior to
calculating the seismic design force is the component
importance factor (Ip). ASCE 7-05 defines the
component importance factor as:
Importance
Factor, Ip
• Life safety component required to function
after seismic event.
1.5
1.0All other components
• Component containing hazardous content
• Components installed at Group III
(essential) facilities
Products such as ammonia refrigerant condensers should
always be assigned an importance factor of 1.5 since they
contain ammonia. The IBC identifies ammonia as
hazardous content in reference of OSHA standards.
According to the American Society of Civil Engineers
(ASCE) Manual, 07-05 edition, section 13.1.3, hazardous
materials require an importance factor of 1.5.
Classification
Design Implementation
In order to achieve this goal, an architect or civil engineer
is responsible for analyzing the soil and the design of a
structure to determine the factors to be used. A
mechanical consulting engineer and/or design build
contractor applies these factors to advise the
manufacturer on the proper design for the application.
EVAPCO takes this information and determines the
necessary equipment to meet IBC regulations. Evapco
then determines the condenser design requirements
based on the IBC criteria. The standard PMC-E design is
independently certified to meet the 1g IBC compliance
factors. For applications that require a more severe
seismic duty, EVAPCO offers an optional 5.12g
construction design. This process ensures that the
mechanical equipment and its components are seismically
compliant per the provisions of the International Building
Code.
Independent Certification
As required by the International Building Code, EVAPCO
supplies a certificate of compliance as part of its
submittal documents. The certificate of compliance
should demonstrate that the equipment/unit has been
independently tested and analyzed in accordance with
the IBC program. Evapco has worked closely with
Vibrations Mountings and Controls Group (VMC) to
complete the independent equipment testing and
analysis. A sample of the
certificate of compliance and unit
label is presented below:
7
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PMC-E Selection Procedure
Superheated
Refrigerant
Gas In
HotSaturatedDischargeAir
Condensed
Refrigerant
Liquid Out
Cool Dry
Entering Air
Selection Procedure
wo methods of selection are presented, the first is based on
T
the total heat of rejection as described immediately below.
The second and more simple method is based on evaporator
tons. The evaporator ton method is only applicable to systems
ith open type reciprocating compressors.
w
The heat of rejection method is applicable to all but
centrifugal compressor applications and is normally used for
selecting evaporative condensers for use with hermetic
compressors and screw compressors. It can also be used for
standard open type reciprocating compressors as an alternate
to the evaporator ton method.
The evaporator ton method is based on the estimated heat of
compression. The heat of rejection method of selection is
more accurate and should be used whenever possible.
Refer to the factory for selections on systems with centrifugal
compressors.
Principle of Operation
The refrigerant gas is discharged from the compressor into the
inlet connection of the evaporative condenser. Water from
the condenser’s sump is continuously flooded over the
condenser coil, while ambient air is simultaneously forced into
the unit. As the ambient air moves up through the coil section,
a portion of the spray water is evaporated into the air stream.
The evaporative process cools the spray water, which in turn
cools the tubes containing the refrigerant gas. The cool tube
walls cause the refrigerant gas to give up heat and condense
into a liquid. The condensed liquid flows out of the coil’s
sloping tubes to the high pressure liquid receiver for return to
the system.
The hot, saturated air is driven through the drift eliminators,
where any entrained water droplets are removed. The
condenser’s fan then discharges this air stream out of the top
of the unit at a high velocity, where it can dissipate harmlessly
into the atmosphere. The water which was not evaporated
falls into the sump and is recirculated by the spray pump to the
water distribution system above the condensing coil section.
Heat of Rejection Method
In the heat of rejection method, a factor for the specified
operating conditions (condensing temperature and wet bulb) is
obtained from Table 1 or 2 and multiplied times the heat of
rejection.
The resultant figure is used to select a unit from Table 3. Unit
capacities are given in Table 3 in thousands of BTU/Hr or
MBH.
If the heat of rejection is not known, it can be determined by
one of the following formulas:
Open Compressors
Heat of Rejection = Evaporator Load (BTU/Hr) +
Compressor BHP x 2545
Hermetic Compressors
Heat of Rejection = Evaporator Load (BTU/Hr) + K.W.
Compressor Input x 3415
EXAMPLE
Given: 450 ton load, ammonia refrigerant 96.3° condensing
temperature, 78° W.B. temperature and 500 compressor BHP.
Selection: Heat of Rejection
From Table 2 the capacity factor for 96.3° condensing and
78° W.B. = 1.37 6,672,500 x 1.37 = 9,141,325 BTU/Hr or
9142 MBH. Therefore, select a model PMC-631E.
Note: For screw compressor selections employing water
cooled oil cooling, select a condenser for the total MBH as in
the example. The condenser can then function in one of two
ways:
(1) Recirculating water from the water sump can be used
directly in the oil cooler. A separate pump should be
employed and the return water should be directed into the
water sump at the opposite end from the pump suction.
(2) The condenser coil can be circuited so that water or a
glycol-water mixture for the oil cooler can be cooled in a
separate section of the coil. Specify load and water flow
required.
:
:
450 tons x 12000 = 5,400,000 BTU/Hr
500 BHP x 2545 = 1,272,500 BTU/Hr
Total 6,672,500 BTU/Hr
For refrigerant injection cooled screw compressors, select the
condenser in the same manner as shown in the example.
Principle of Operation
If the oil cooler is supplied by water from a separate source,
then the oil cooling load should be deducted from the heat of
rejection before making the selection.
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PMC-E Selection Procedure
Table 1 - HCFC-22 and HFC-134a Heat Rejection Factors
In the evaporator ton method, factors for the specified
operating conditions (suction temperature, condensing
temperature and wet bulb) are obtained from either Table
5 or 6 and multiplied times the heat load in tons. The
resultant figure is used to select a unit from Table 4. The
condenser model in Table 4 is equal to the unit capacity in
evaporator tons for HCFC-22 or HFC-134a conditions of
105°F condensing, 40°F suction and 78° wet bulb.
iven: 300 ton evaporator load, R-717, condensing at 95°
G
F, with +10° F suction and 76° F wet bulb temperatures.
Selection: The capacity factor from Table 6 for the given
condensing and wet bulb conditions is 1.38, and the
capacity factor for the suction temperature of +10° F is
1.03, so the corrected capacity required may be
determined as:
300 X 1.38 X 1.03 = 426 corrected tons. Therefore,
select a model PMC-428E, PMC-431E or PMC-450E
depending on unit type desired, and any layout or
horsepower considerations.
* Tons at standard conditions: 96.3°F condensing, 20°F suction and 78°F W.B.
** Gallons shown is water in suspension in unit and piping. Allow for additional water in bottom of remote sump to cover pump suction and strainer during operation.
(12” would normally be sufficient.)
† Heaviest section is the upper coil section. When 5.12 seismic design is required consult the factory for specific weights.
*** Refrigerant charge is shown for R-717. Multiply by 1.93 for R-22 and 1.98 for R-134a.
Dimensions are subject to change. Do not use for pre-fabrication.
* Tons at standard conditions: 96.3°F condensing, 20°F suction and 78°F W.B.
** Gallons shown is water in suspension in unit and piping. Allow for additional water in bottom of remote sump to cover pump suction and strainer during operation.
(12” would normally be sufficient.)
† Heaviest section is the upper coil section. When 5.12 seismic design is required consult the factory for specific weights.
*** Refrigerant charge is shown for R-717. Multiply by 1.93 for R-22 and 1.98 for R-134a.
Dimensions are subject to change. Do not use for pre-fabrication.
* Tons at standard conditions: 96.3°F condensing, 20°F suction and 78°F W.B.
** Gallons shown is water in suspension in unit and piping. Allow for additional water in bottom of remote sump to cover pump suction and strainer during
operation.
(12” would normally be sufficient.)
† Heaviest section is the upper coil section. When 5.12 seismic design is required consult the factory for specific weights.
*** Refrigerant charge is shown for R-717. Multiply by 1.93 for R-22 and 1.98 for R-134a.
14
Dimensions are subject to change. Do not use for pre-fabrication.
* Tons at standard conditions: 96.3°F condensing, 20°F suction and 78°F W.B.
** Gallons shown is water in suspension in unit and piping. Allow for additional water in bottom of remote sump to cover pump suction and strainer during operation.
(12” would normally be sufficient.)
† Heaviest section is the upper coil section. When 5.12 seismic design is required consult the factory for specific weights.
*** Refrigerant charge is shown for R-717. Multiply by 1.93 for R-22 and 1.98 for R-134a.
Dimensions are subject to change. Do not use for pre-fabrication.
* Tons at standard conditions: 96.3°F condensing, 20°F suction and 78°F W.B.
** Gallons shown is water in suspension in unit and piping. Allow for additional water in bottom of remote sump to cover pump suction and strainer during operation.
(12” would normally be sufficient.)
† Heaviest section is the upper coil section. When 5.12 seismic design is required consult the factory for specific weights.
*** Refrigerant charge is shown for R-717. Multiply by 1.93 for R-22 and 1.98 for R-134a.
Dimensions are subject to change. Do not use for pre-fabrication.
* Tons at standard conditions: 96.3°F condensing, 20°F suction and 78°F W.B.
** Gallons shown is water in suspension in unit and piping. Allow for additional water in bottom of remote sump to cover pump suction and strainer during operation.
(12” would normally be sufficient.)
† Heaviest section is the upper coil section. When 5.12 seismic design is required consult the factory for specific weights.
*** Refrigerant charge is shown for R-717. Multiply by 1.93 for R-22 and 1.98 for R-134a.
Dimensions are subject to change. Do not use for pre-fabrication.
†† These units are available for Ammonia applications only.
* Tons at standard conditions: 96.3°F condensing, 20°F suction and 78°F W.B.
** Gallons shown is water in suspension in unit and piping. Allow for additional water in bottom of remote sump to cover pump suction and strainer during operation.
(12” would normally be sufficient.)
† Heaviest section is the upper coil section. When 5.12 seismic design is required consult the factory for specific weights.
†† Heaviest section is the lower basin section.
*** Refrigerant charge is shown for R-717. Multiply by 1.93 for R-22 and 1.98 for R-134a.
Dimensions are subject to change. Do not use for pre-fabrication.
* Tons at standard conditions: 96.3°F condensing, 20°F suction and 78°F W.B.
** Gallons shown is water in suspension in unit and piping. Allow for additional water in bottom of remote sump to cover pump suction and strainer during operation.
(12” would normally be sufficient.)
† Heaviest section is the upper coil section. When 5.12 seismic design is required consult the factory for specific weights.
†† Heaviest section is the lower basin section.
*** Refrigerant charge is shown for R-717. Multiply by 1.93 for R-22 and 1.98 for R-134a.
Dimensions are subject to change. Do not use for pre-fabrication.
Spray PumpRemote Sump
Coil
Volume
Gallons Conn.
Req’d**
Operating
SizeWeightHUA
HeightUpperCoil
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Optional Equipment
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Pulse~Pure
®
Pulse~Pure®is an
environmentally sensitive
non-chemical water treatment system for evaporative
condensers. Developed by EVAPCO, Pulse~Pure
alternative to chemical water treatment programs. Utilizing
pulse-power technology Pulse~Pure
reatment that is environmentally safe.
t
®
provides chemical-free
®
offers an
Smart Shield®Solid Chemistry Water
Treatment System
EVAPCO's SmartShield®solid
chemistry water treatment
system is an innovative
solution to conventional
liquid chemical programs.
SmartSheild
®
was developed
specifically for evaporative
condensers and closed
circuit coolers. The system
comes factory mounted and includes all the components
required for an effective water treatment system. Solid
products eliminate the potential for liquid spills making it easier
and safer to use. Controlled release chemistry provides
uniform treatment over a 30 day period.
Oversized Access Door
For enhanced basin accessibility, the
Oversized Access Door option enables
maintenance personnel to quickly and
easily enter the basin for float valve
adjustment and unit inspection.
Self Supporting Service
Platforms
Condensers are available with self-supporting service platforms
that include access ladders which are designed for easy field
installation. This option offers significant savings in comparison
to field constructed, externally supported catwalks. The Evapco
service platform option may be installed on either side, or the
end opposite the connections.
Two Speed Motors
Two speed fan motors can provide an excellent means of
capacity control. In periods of lightened loads or reduced wet
bulb temperatures, the fans can operate at low speed, which
will provide about 60% of full speed capacity, yet consume
only about 15% of the power compared with high speed. In
addition to the energy savings, the sound levels of the units
will be greatly reduced at low speed.
Electric Water Level Control
Evaporative condensers may be ordered with an
electric water level control in lieu of the standard
mechanical float and make-up assembly. This
package provides accurate control of water
levels and does not require field adjustment.
Water Level Indicator
Condensers may be supplied with a water level indicator to
provide a visual indication of basin water level without opening
access doors or air inlet louvers. The level indicator can be
furnished with an optional low and high level alarm switches or
a transmitter for continuous level monitoring.
Super-Low Sound Fan
Evapco’s Super Low Sound Fan
utilizes an extremely wide chord
blade design and is ideal for low
energy, sound sensitive
installations without sacrificing
thermal performance. This
revolutionary technology is onepiece molded, heavy duty
fiberglass reinforced polyester
hub and blade construction
utilizing a forward swept blade
design. The Super Low Sound
Super Low Sound Fan
Fan is capable of reducing the unit sound pressure levels 10
dB(A) to 13 dB(A) depending on specific unit selection and
measurement location.
ASME Coils
Evaporative condensers can be furnished with condensing
coils manufactured in accordance with the ASME Pressure
Vessel Code Section VIII, Division I. Coils built with this option
will bear a U-stamp indicating their compliance with the
ASME code.
TITAN Coils – Stainless Steel Construction
EVAPCO offers the option of Type 304L or Type 316L
stainless steel construction using the Thermal Pak
design. Highly efficient heat transfer coils with the ultimate
corrosion protection.
®
II coil
Remote Sump Configuration
For units operating in areas where temperatures may be very
low, or where low temperatures may occur during periods
when the unit is not operating, a sump located inside the
building is the preferred means of ensuring that the basin
water will not freeze. For these applications, the condenser will
Multiple Circuit Coils
Condensers may be supplied with multiple circuit coils to
match various system requirements such as split systems,
or if a glycol or water circuit is desired for compressor
head cooling.
be supplied without the spray pump, suction strainers and all
associated piping, but with an oversize bottom outlet.
20
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Electric Heaters
A
B
Electric Heaters/Steel Support
Electric immersion heaters are available factory installed in the
basin of the condenser. They are sized to maintain a +40° F
pan water temperature with the fans off and an ambient air
temperature of 0°F, -20°F, or -40°F. They are furnished with a
combination thermostat/low water protection device to cycle
the heater on when required and to prevent the heater
elements from energizing unless they are completely
submerged. All components are in weather proof enclosures
for outdoor use. The heater power contactors and electric
wiring are not included as standard.
PMC-E Heater Sizes
Models0°F-20°F-40°F
PMC-175E to PMC-240E579
PMC-250E to PMC-375E(2) 4(2) 5(2) 7
PMC-332E to PMC-530E81216
PMC-503E to PMC-792E(2) 6(2) 9(2) 12
PMC-725E to PMC-1056E(2) 8(2) 12(2) 15
PMC-1006E to PMC-1586E(2) 12(4) 9(4) 12
PMC-376E to PMC-640E101520
PMC-568E to PMC-955E(2) 7(2) 12(2) 15
PMC-715E to PMC-1013E(2) 8(2) 12(2) 15
PMC-911E to PMC-1258E(2) 9(2) 15(2) 18
PMC-752E to PMC-1286E(2) 9(2) 15(2) 18
PMC-1137E to PMC-1911E(2) 15(4) 10(4) 15
PMC-1705E to PMC-2019E(2) 15(4) 12(4) 15
Steel Support
The recommended support for EVAPCO condensers is
structural “I” beams located under the outer flanges and
running the entire length of the unit. Mounting holes, 3/4” in
diameter are located in the bottom channels of the pan
section to provide for bolting to the structural steel. (Refer to
certified drawings from the factory for bolt hole locations.)
Beams should be level to within 1/8” in 6’ before setting the
unit in place. Do not level the unit by shimming between it
and the “I ” beams as this will not provide proper longitudinal
support.
PMC-E Dimensions
5' Wide ModelsAB
PMC-175E to 240E 11’ 11-5/8”6’ 4”
250E to 375E 18’ 1/8”6’ 4”
10' Wide ModelsAB
PMC-332E to 530E 11’ 11-3/4”9’ 9-3/4”
503E to 792E 18’ 1/8”9’ 9-3/4”
725E to 1056E 24’ 7/8”9’ 9-3/4”
1006E to 1586E 36’ 2”9’ 9-3/4”
12' Wide ModelsAB
PMC-376E to 640E 11’ 11-3/4”11’ 10-3/8”
568E to 955E 18’ 1/8”11’ 10-3/8”
715E to 1013E 20’ 1/4”11’ 10-3/8”
911E to 1258E 24’ 7/8”11’ 10-3/8”
752E to 1286E 24’ 7/8”11’ 10-3/8”
1137E to 1911E 36’ 2”11’ 10-3/8”
1705E to 2019E 40’ 2”11’ 10-3/8”
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Application
Design
EVAPCO units are heavy-duty construction and designed for
long trouble-free operation. Proper equipment selection,
installation and maintenance is, however, necessary to ensure
ood unit performance. Some of the major considerations in
g
the application of a condenser are presented below. For
additional information, contact the factory.
Air Circulation
In reviewing the system design and unit location, it is
important that proper air circulation be provided. The best
location is on an unobstructed roof top or on ground level
away from walls and other barriers. Care must be taken when
locating condensers in wells or enclosures or next to high
walls. The potential for recirculation of hot, moist discharge
air back into the fan intake exists. Recirculation raises the wet
bulb temperature of the entering air causing the condensing
pressure to rise above the design. For these cases, a
discharge hood or ductwork should be provided to raise the
overall unit height even with the adjacent wall, thereby
reducing the chance of recirculation. Good engineering
practice dictates that the evaporative condenser’s discharge
air not be directed or located close to or in the vicinity of
building air intakes. Engineering assistance is available from
the factory to identify potential recirculation problems and
recommend solutions.
For additional information regarding layout of evaporative
condensers, see EVAPCO Bulletin entitled “Equipment
Layout”.
Piping
Condenser piping should be designed and installed in
accordance with generally accepted engineering practice. All
piping should be anchored by properly designed hangers and
supports with allowance made for possible expansion and
contraction. No external loads should be placed upon
condenser connections, nor should any of the pipe supports be
anchored to the unit framework. For additional information
concerning refrigerant pipe sizing and layout, see EVAPCO
Bulletin entitled “Piping Evaporative Condensers”.
Super Low Sound Fan
Evapco’s Super Low Sound Fan on the PMC-E Condenser
utilizes an extremely wide chord blade design available for
sound sensitive applications where the lowest sound levels are
desired. The fan is one pieces molded heavy duty FRP
construction utilizing a forward swept blade design. The
Super Low Sound Fan reduces sound levels 10 to 13 dB(A)
compared to the standard PMC-E Fan. For a detailed analysis,
please contact your EVAPCO Sales Representative.
Maintaining the Recirculated Water System
The heat rejection in a condenser is accomplished by the
evaporation of a portion of the recirculated spray water. As
this water evaporates, it leaves behind all of its mineral content
and impurities. Therefore, it is important to bleed-off an
mount of water equal to that which is evaporated to prevent
a
the build-up of these impurities. If this is not done, the mineral
or the acidic nature of the water will continue to increase. This
will ultimately result in heavy scaling or a corrosive condition.
Bleed-off
Each unit supplied with a pump mounted on the side is
furnished with a clear bleed line for visual inspection and a
valve which, when fully open, will bleed-off the proper amount
of water. If the make-up water supplying the unit is relatively
free of impurities, it may be possible to cut back the bleed, but
the unit must be checked frequently to make sure scale is not
forming. Make-up water pressure should be maintained
between 20 and 50 psig.
Water Treatment
In some cases the make-up will be so high in mineral content
that a normal bleed-off will not prevent scaling. In this case
water treatment will be required and a reputable water
treatment company familiar with the local water conditions
should be consulted.
Any chemical water treatment used must be compatible with
the construction of the unit. If acid is used for treatment, it
should be accurately metered and the concentration properly
controlled. The pH of the water should be maintained
between 6.5 and 8.0. Units constructed of galvanized
steel operating with circulating water having a pH of 8.3
or higher will require periodic passivation of the
galvanized steel to prevent the formation of “white rust”.
Batch chemical feeding is not recommended because it does
not afford the proper degree of control. If acid cleaning is
required extreme caution must be exercised and only
inhibited acids recommended for use with galvanized
construction should be used. For more information see
Water quality should be checked regularly for biological
contamination, If biological contamination is detected, a more
aggressive water treatment and mechanical cleaning program
should be undertaken. The water treatment program should
be performed in conjunction with a qualified water treatment
company. It is important that all internal surfaces be kept clean
of accumulated dirt and sludge. In addition, the drift
eliminators should be maintained in good operating condition.
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Page 23
Mechanical Specifications
Furnish and install, as shown on the plans, an EVAPCO
odel _____________ evaporative condenser. Each unit
m
shall have condensing capacity of _____________ BTUH
eat rejection, operating with _____________refrigerant at
h
_____°F condensing temperature and ______ °F design
_
wet bulb temperature.
IBC Compliance
The condenser shall be designed and constructed to meet
the International Building Code specifications for installed
components per ASCE 7-05. The manufacturer shall
provide a certificate of compliance to demonstrate that the
equipment/unit has been independently tested and certified
in accordance with the IBC program.
Pan and Casing
The pan and casing shall be constructed of G-235 hot-dip
galvanized steel for long life and durability. The heat transfer
section shall be removable from the pan to provide easy
handling and rigging.
The pan/fan section shall include fans, motors and drives
mounted and aligned at the factory. These items shall be
located in the dry entering air stream to provide maximum
service life and easy maintenaince. The pan bottom shall be
sloped to the drain to ensure easy draining and to facilitate
cleaning. Standard pan accessories shall include circular
access doors, stainless steel strainers, wastewater bleed line
with adjustable valve and brass makeup valve, with an
unsinkable foam filled plastic float.
Power-Mizer Fan Drives
Fans shall be vane-axial type constructed of cast aluminum
alloy blades. They shall be arranged in a two-stage system
installed in a closely fitted cowl with venturi air inlet and air
stabilizing vanes. Fan shaft bearings shall be a heavy-duty self
aligning ball type with grease fittings extended to the outside
of the unit.
The fan drive shall be solid backed Power-Band constructed
of neoprene with polyester cords designed for 150% of motor
nameplate horsepower. Drives are to be mounted and
aligned at the factory.
Each fan shall be driven individually by a dedicated fan motor.
Fan motors may be cycled independently without harmful
moist air bypass.
Heat Transfer Coil
The coil(s) shall be all prime surface steel, encased in steel
framework with the entire assembly hot-dip galvanized after
fabrication. Coil(s) shall be designed with sloping tubes for
free drainage of liquid refrigerant and tested to 400 psig air
pressure under water.
Water Distribution System
The system shall provide a water flow rate of 6 GPM over
each square foot of the unit face area to ensure proper
flooding of the coil. The spray header shall be constructed
of schedule 40, PVC pipe for corrosion resistance. All spray
branches shall be removable and include a threaded end
plug for cleaning. The water shall be distributed over the
entire coil surface by heavy-duty ABS spray nozzles with
large 1-1/4” diameter opening and internal sludge ring to
eliminate clogging. Nozzles shall be threaded into a spray
header to provide easy removal for maintenance.
Water Recirculation Pump
The pump(s) shall be a close-coupled, centrifugal type with
mechanical seal, installed at the factory. _____________
horsepower totally enclosed, motor shall be furnished suitable
for outdoor service on _____________ volts, _____________
hertz, and _____________ phase.
Eliminators
The eliminators shall be constructed entirely of inert
polyvinyl chloride (PVC) in easily handled sections. The
eliminator design shall incorporate three changes in air
direction to assure complete removal of all entrained
moisture from the discharge air stream. Maximum drift rate
shall be less than 0.001% of the circulating water rate.
Finish
All pan and casing materials shall be constructed of G-235
heavy gauge mill hot-dip galvanized steel for maximum
protection against corrosion. During fabrication, all panel
edges shall be coated with 95% pure zinc-rich compound.
Fan Motor
_________ horsepower totally enclosed fan cooled
motor(s) with 1.15 service factor shall be furnished suitable for
outdoor service on _________ volts, _________ hertz,
and _________ phase. Motor(s) shall be mounted on an
adjustable base.
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Page 24
W
orld Headquarters/
Research and
Development Center
E
VAPCO Facilities
W
Re
D
OUR PRODUCTS ARE MANUFACTURED WORLDWIDE
EVAPCO, Inc. — World Headquarters & Research/ Development Center
North America
EVAPCO, Inc.
World Headquarters
P.O. Box 1300
Westminster, MD 21158 USA
410-756-2600 p | 410-756-6450 f
[email protected]
EVAPCO East
5151 Allendale Lane
Taneytown, MD 21787 USA
410-756-2600 p | 410-756-6450 f
[email protected]
1011 US Highway 22 West
Bridgewater, NJ 08807 USA
Phone: 1-908-379-2665
E-mail: [email protected]
EVAPCO-BLCT Dry Cooling, Inc.
7991 Shaffer Parkway
Littleton, CO 80127 USA
Phone: 1-908-379-2665
E-mail: [email protected]
Spare Parts Phone: 908-895-3236
Spare Parts e-mail: [email protected]
EVAPCO Power México S. de R.L. de C.V.
Calle Iglesia No. 2, Torre E
Tizapan San Ángel, Del. Álvaro Obregón
Ciudad de México, D.F. México 01090
Phone: +52 (55) 8421-9260
e-mail: [email protected]