HVAC Pump System
Part 1 General
1.01 Section Includes
A. HVAC Packaged Pump System
1. Structural steel base
2. Pumps and motors
3. Piping, valves, and fittings
4. Control valves
5. Variable frequency drive
6. Sequencing controls
7. Pressure, flow, and/or temperature transmitters
8. BAS BACNet interface
1.02 Related Sections
A. Section_______: General Requirements
1.03 References
A.
B.
C.
D.
E.
F.
G.
H.
I.
J.
Hydraulic Institute
ANSI - American National Standards Institute
NEMA - National Electrical Manufacturers Associations
UL - Underwriters Laboratories
ETL - Electrical Testing Laboratories
CSA - Canadian Standards Association
NEC - National Electric Code
BOCA – Building Officials and Code Administrators International, Inc.
UBC – Uniform Building Code
CTI – Cooling Tower Institute
1.04 Submittals and Operation Manuals
A. Submittals shall include the following as a minimum:
1. System design information sheet.
2. Description of system operation.
3. Packaged system dimension and general arrangement drawing.
4. Electrical power and control-wiring diagram.
5. Pump material and construction drawing.
6. Pump curve showing design point.
7. Catalog information on valves, strainers and control components.
8. Name and address of factory trained Service Company.
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9. Piping schematic of packaged system components, showing all pipe sizes,
location of reducers, components, specialties and instrumentation.
10. Structural base drawings showing number and size of members accompanied
by deflection calculations.
11. A predictive pumping energy analysis showing system efficiency and kW for
all pump combinations.
12. Complete Variable Frequency Drive submittal.
B. Submittals, which are generic and not specifically designed to meet the
requirements on this section, shall not be acceptable.
C. Provide
copies of submittals to the consulting engineer for approval.
D. Operation and Maintenance Manuals shall include the following as a minimum:
1.
2.
3.
4.
5.
6.
7.
8.
9.
System design information sheet.
Description of system operation.
Packaged system dimension and general arrangement drawing.
Piping schematic of packaged system components and specialties.
Control panel drawing with list of operator interfaces.
Electrical power and control-wiring diagram.
Bill of material.
Pump operation and maintenance instructions.
Special electrical component operation instructions
E. Provide
up.
copies of Operation and Maintenance Manuals prior to system start-
F. Submittals and Operation Manuals shall be assembled in a neat and orderly
manner. Submittals and Operation Manuals shall be bound in booklet form and
shall include a front and back cover and a title page with appropriate job name,
location and equipment title. An electronic copy of the approved submittal and
Operation Manuals shall be included separately.
G. If the submittals are rejected for the same reasons more than once, upon the third
submission the packaged pumping manufacturer shall pay the engineer $2500.00
for his service before the third or subsequent submittal is reviewed.
1.05 Quality Assurance
A. The packaged pump system manufacturer must also be the manufacturer of the
control logic panel used on the system and shall be listed by Underwriters
Laboratories as an approved manufacturer of industrial control panels. Use of
commercial grade controllers from the building automation contractor is not
acceptable. Upon request from the engineer, the manufacturer shall furnish proof
of listing.
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B. The manufacturer of the packaged pump system shall have in place a Quality
Assurance program. Provide with the submittal documentation of this program
including the testing procedure that will take place.
C. The manufacturer shall have a minimum of fifteen years manufacturing and
application experience and shall be responsible for the proper pressure and flow in
the entire system.
D. After factory assembly, the packaged pump system shall be hydrostatically tested
to 150 PSIG for ANSI Class 150 and 250 PSIG for ANSI Class 300 for a
minimum of thirty minutes. The control system shall be tested and all sequences
and alarms shall be simulated.
1.06 Delivery of Equipment
A. The entire packaged pump system shall be factory assembled and tested as a
complete unit. Prior to shipment, the system manufacturer may be required to
disassemble the unit in sub-assembly form to allow access of the equipment to the
final location at the jobsite. Reassembly of the equipment at the jobsite is the
responsibility of the installer. These sub-assemblies will be authorized by the
engineer and coordinated between the installer and the packaged pump system
manufacturer.
B. Drain plugs shall be removed from equipment where the possibility of freeze
damage may exist.
C. Comply with manufacturer's instructions for rigging, unloading, and transporting
equipment.
Part 2 Product
2.01 Manufacturers
A. Base bid.
1. Grundfos Commercial Building Systems (GCB), Brookshire, TX.
B. Alternates. Manufacturers desiring to bid as an alternate to the base bid system
must submit a request in writing to the engineer ten (10) days prior to the bid date.
Alternate manufacturers must also submit with their request to bid the following
data for the engineer's review:
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1.
2.
3.
4.
5.
6.
Complete control sequence.
Pumping energy analysis.
System performance data.
Documentation of proposed equipment with flow diagrams.
Itemized list of any exceptions taken to the base bid specification.
Provide a letter from an officer of the packaged pumping manufacturer stating
that the exceptions listed are the only deviations from the specifications.
2.02 Manufactured Units
A. Furnish and install a factory assembled variable speed packaged pump system.
The system shall require only suction and discharge pipe connections and one
electrical power connection and necessary terminal contacts to the various field
mounted devices and the building automation system.
B. The packaged system shall consist of system base, pumps, electric motors,
controls, valves and all necessary piping and components as listed in Section 1.01
A of this specification for a complete system. The system shall be designed for
xxxx GPM at a total dynamic head of xxx feet.
2.03 Components
A. Pumps and Motors – End Suction Pumps
1) Furnish and install end suction split coupled pumps as per plans and pump
schedule The pumps shall be split coupled, base mounted, single stage, end
suction top discharge design, cast iron bronze fitted construction.
2) The pumps shall have the following features:
i) All pumps shall be of the back pull-out design so that the rotating
element can be removed from the casing without disconnecting the
suction or discharge piping. The casing material shall be close-grained
cast iron ASTM A48 - Class 30 with a minimum tensile strength of
30,000 P.S.I. Volute shall have integrally cast suction and discharge
connections, gauge ports at nozzles, and vent and drain ports. Pumps
with specific speed greater than 1600 shall have double volute casing.
Pumps with discharge size 3” and larger shall have suction splitter to
reduce pre-rotation and improve efficiency. Casings shall be designed
for scheduled working pressure and can withstand hydrostatic test at
150% of the maximum working pressure under which the pump could
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ii)
iii)
iv)
v)
operate at design speed.
Pumps with impeller diameter larger than 5” shall be fitted with
vesconite renewable case wear rings.
Pumps with discharge size 2.5” and larger shall have full flanged
connections on both suction and discharge. Suction and discharge
flanges shall be drilled to ANSI Class 125# standards and be machined
flat face.
Pumps with discharge sizes 2” and below shall have NPT threaded
connection.
Pump shall be mounted on a structural steel base with cast iron motor
deck and a ductile iron pump support.
vi) The pump shaft shall be of solid stainless steel AISI 303.
vii) The pump manufacturer shall recommend the proper mechanical seal
based on the pressure, temperature and liquid outlined on the
equipment schedule. Mechanical seals, at a minimum, shall have
ceramic stationary seats, carbon rotating rings, Buna elastomers and
stainless steel hardware. Application of a mechanical seal shall be
internally flushed type, without requiring external flushing lines. Seals
shall be capable of being inspected and easily replaced without
removing the piping or volute.
viii) Recirculation line of nylon tubing with brass fitting shall be
provided to vent the mechanical seal and cool the bushing (shaft
bearing).
ix) Impeller shall be of the enclosed francis vane type, single suction
design, made of Silicon Bronze, ASTM B584 C87600, both
hydraulically and dynamically balanced to ISO 1940-1:2003 balance
grade G6.3 and keyed to the shaft. The impeller shall be trimmed to
meet the specific hydraulic requirements.
3)
4)
5)
6)
x) Pump Construction. The standard material of construction for the
pump shall be as below. Special material shall be available as option to
suit the liquid pumped.
Volute: Cast iron ASTM A48 - Class 30
Case Wear ring: Vesconite
Impeller: Silicon Bronze ASTM B584 C87600
Shaft: Stainless Steel AISI 303
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7) Coupling: 2011-T3, 2017-T4, or 2024-T351 Aluminium
8) Motor Bracket: Cast Iron ASTM A48- Class 30
9) Bushing (shaft bearing): Vesconite
10) Pump Support: Ductile Iron ASTM 536- Class 65
11) Mechanical Seals: Carbon – Ceramic with Buna Elastomers and Stainless
Steel hardware
12) Recirculation Line: Nylon Tubing with Brass Fittings
13) Pump shall be connected to the drive motor by a rigid, aluminum, axially
split coupling capable of withstanding all torsional, radial and axial loads.
The coupling design shall facilitate alignment of the motor and pump
shaft.
14) The pump manufacturer shall provide an OSHA approved coupling guard,
which shall be mounted between the pump and motor
15) The base shall be of bolted construction. The motor deck shall be cast iron
with ductile iron pump support. The side rail shall be structural steel. The
minimum stiffness of the base shall conform to ANSI/HI 1.3-2000, section
1.3.5.3 for Horizontal Base Plate Design standards. The entire unit shall
not require grouting for operation within Hydraulic Institute Standards for
Vibration.
16) Pump rotation shall be clockwise as viewed from the motor end.
17) Pump shall be of a maintainable design for ease of maintenance and
should use machine fit parts that are easily disassembled.
18) Each pump shall be painted with one coat of high quality factory approved
paint and name-plated before shipment from the factory.
19) Where noted on schedule the pump shall also be NSF-61 certified.
20) Pumps shall be manufactured and assembled in an ISO-9001 certified
facility.
Motors
Motors shall meet scheduled horsepower, speed, voltage, and enclosure design.
Pump and motors shall be factory aligned, and shall be realigned after installation
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by the manufacturer’s representative.
Motor shall be of a C-face design with a lockable split collar on motor side to
facilitate precise positioning of rotating assembly with reference to Hydraulic
geometry.
Motors shall be suitably sized per ISO5199 and shall meet NEMA specifications
and conform to the standards outlined in EISA 2007.
B. Piping, valves, and fittings
The package piping shall consist of fabricated welded steel headers using
manufactured fittings conforming to ASME Code B.31.1. All piping for the
system shall be sized for a maximum velocity of 10 feet per second with no
greater head loss per 100 feet of pipe than 8.5 feet. Branch piping to the pumps
shall be sized for the design capacity of the pump. Base mounted supports shall
be provided for the suction header, the suction and discharge piping on each pump
and the discharge header. Piping shall be supported independently of pump
connections. Pipe supports welded directly to the pipe shall be unacceptable.
Pipe supports shall be arranged to permit field installation by the contractor of
1.5" thick pipe insulation.
Pete's plugs are to be provided on the suction and discharge of the package
connections.
Drain plugs are to be provided in the pipe above the check valve or in any low
piping that may collect water.
Butterfly valves shall be furnished on the suction and discharge of each pump.
Valves shall be constructed with a ductile iron lug body, EPDM seat, aluminum
bronze disc, 416 stainless steel shaft and bronze bushings. Valves 6" and smaller
shall be provided with lever operators and valves 8" and larger shall be provided
with hand-wheel and gear operator.
A spring-loaded check valve shall be installed on the discharge of each pump.
Valve shall be iron body with a pressure rating equal to pump shut-off head plus
maximum suction pressure. Valve trim shall be bronze with stainless steel spring.
Above each check valve provide spool piece with a drain plug.
A suction strainer shall be installed on the suction of each pump. The strainer
shall be of the suction diffuser type. The strainer shall be constructed with a cast
iron body and stainless steel or brass screen. The strainer shall be full sized; a
reducing strainer is not acceptable. Provide an eccentric reducer connected
directly to the suction of the pump and a concentric expander connected directly
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to the discharge of the pump. The strainer shall include mounted blow-down
valve. Blow-down valve shall be piped to drain by contractor.
C. Control valves
Four, 8" automatic, two-way, two-position, control valve(s) with electric actuator
shall be provided as part of the packaged pump system for heat exchanger
isolation. The valves shall be shipped loose for field installation by contractor.
The electric, two-position assembly shall be designed for quarter turn operation.
The butterfly valve shall be constructed with a ductile iron lug body, EPDM seat,
aluminum bronze undercut disc, 416 stainless steel shaft, and copper and brass
bushings. The actuator shall be mounted on a bracket, which is coupled to the
valve shaft. The actuator shall have a split phase capacitor AC reversing motor
with 25% duty. The actuator shall require 120 VAC, 1 Ph, 60 Hz power. The
gearing on actuators with a torque rating of 120-720 in-lbs shall be a sealed,
permanently lubricated spur gear module driving a final dual torque bull gear.
The gearing on actuators with a torque rating of 1440-2400 in-lbs shall have a
permanently lubricated self-locking gear train with two stage planetary gear. The
actuator shall be equipped with a mechanical brake. The actuator shall be housed
in a Nema 4 corrosion resistant enclosure with a baked epoxy coating. The
actuator shall have a thermal motor overload protector with automatic reset. The
actuator shall be equipped with two single pole double throw internally mounted
adjustable cam operated limit switches, two isolated normally open limit switches
for position indication, and manual override capability. The actuator shall be
listed UL, ETL, and/or CSA. The valve opening and closing rate shall be
adjustable.
D. Air separator (as needed)
A tangential air separator shall be provided for the CHW system. The separator
shall consist of a welded steel tank. The separator shall have XX" tangential inlet
connection and xx" outlet connection. The unit shall be constructed in accordance
with ASME boiler and pressure vessel code and stamped 125-psig design
pressure. The air separator shall be supplied with an automatic air release valve.
If another mixing device is used that employs screens, the device must be
installed with butterfly valves, wing nut access plates and blow down valves to
facilitate cleaning of the screens.
E. Expansion tank (as needed)
An expansion tank shall be provided. The expansion tank shall be a XXX gallon
pre-charged steel hydro pneumatic tank with replaceable heavy-duty rubber
bladder. The unit shall be constructed in accordance with Section VIII of the
ASME boiler and pressure vessel code and stamped 125 PSIG design pressure.
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F. Chemical shot feeder (as needed)
A 5 gallon chemical shot feeder shall be provided. The shot feeder shall be piped
across the system and shall include shut-off valves, fill funnel with valve, manual
air release valve, and drain connection with valve.
G. Make up water (as needed)
A " make-up water system shall be provided. This system shall include pressurereducing valve set at __ PSIG, double check valve type backflow preventer when
required, shut-off valves, Y-strainer, pressure gauge, and manual bypass.
H. Hoist and trolley (as needed – recommend for over 40 HP motors)
A mono-directional package hoist and trolley system shall be provided, to
facilitate removal and/or installation of package components. The hoist and
trolley shall be completely supported from the base structure and shall be
constructed of structural steel tube for vertical support and structural steel I-beam
for horizontal cross members. The main hoist trolley beam shall be constructed of
tapered flange I-beam. All structural steel shall be ASTM A-36. The trolleys
shall be constructed of heavy-duty design complete with hardened pressed steel
wheels with double row ball bearings. Side plates shall extend beyond wheels to
act as a bumper. The chain hoist shall be constructed of a hardened steel housing
with a two-stage hardened spur gear reduction system and grease lubrication. The
hoist shall also be equipped with mechanical load brakes and bearing mounted
pinions.
Hoists and monorail systems shall have a marked capacity of (1/2) Ton or (1)
Ton.
All Hoists and monorail systems shall comply with all state and federal
regulations and be constructed per ASME B29.24M, HST-2M, B30.11 and ANSI
MH27.1 as directed for hand operated hoists. All design calculations shall
comply with the MANUAL OF STEEL CONSTRUCTION . All hoists and
monorails shall be tested at 125% of the rated maximum capacity. A certified test
report shall be provided for each hoist and monorail.
I. Variable frequency drive
A variable frequency drive shall be furnished for each chilled water pump. The
variable speed drives shall be adjustable frequency, which employ a pulse width
modulated inverter. To insure safety of the equipment, the VFD shall include
these protective features and options:
1. Nema 1 enclosure.
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2.
3.
4.
5.
6.
7.
8.
Static instantaneous over-current and over-voltage trip.
Static over-speed (over-frequency) protection.
Line or fuse loss and under-voltage protection.
Power unit over-temperature protection.
Motor inverse time overload protection.
Input fused disconnect.
Input line reactor or DC choke. AC or DC sized for a minimum of 1 1/2%
impedance.
9. Ammeter.
10. Speed meter.
11. Automatic restart after power failure or minor drive fault. The drive shall
attempt a minimum of two restarts before a complete drive shut-down.
12. Power on light.
13. Manual speed potentiometer or control capability through the keypad.
14. Hand/Off/Automatic Switch or Manual/Automatic Switch with start/stop
pushbutton.
15. VFD fault light and reset.
16. The drive shall include built in diagnostics. Diagnostics shall be annunciated
through the alpha numeric keypad. The drive shall be listed UL, ETL and/or
CSA.
J. Sequencing Controls
The electric control system for the pumps shall be designed to start and stop the
pumps and modulate their speed as required by system demands. The system
shall maintain differential pressure at three remote locations, as indicated on the
plans. The 4-20mA DC signal shall be sent via a shielded twisted pair of wires to
a direct digital Receiver/Controller with discrete signal selection located in the
pump control cubicle. The Receiver/Controller shall have field programmable
independent set points, the value of which shall be the optimum differential
pressure as designed for each remote location and as shown on the plans.
The lead pump shall be started manually or by a remote signal. The lag pump(s)
shall be started and stopped as required to maintain the system differential
pressure and in accordance with the pump efficiency control strategy. The control
system will continually monitor the output kW, speed, flow and TDH of each
pump and calculate the optimal point to sequence on/off the lag pumps. Start and
stop functions shall be equipped with adjustable timers to prevent unnecessary
starting and stopping of the pumps.
The manufacturer of the control system shall evaluate the pump and system
hydraulics and prepare a pump system energy usage analysis. This analysis must
be part of the submittal. The analysis shall compute pump system pressure losses,
pump TDH, pump speed, pump efficiency, system BHP, and variable frequency
drive and motor efficiency based upon the theoretical uniform system demand
curve. The analysis shall compute and project system energy usage and output
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kW at a minimum of ten demand points from 10% to 100% load for each
theoretical uniform system demand curve.
The chilled water pump control system shall include semi-automatic and manual
modes of operation. The operator shall be capable of starting each pump manually
but allow the automatic control to adjust the pump speed to maintain system
differential pressure. The operator shall also have the option of starting each
pump and controlling its speed manually. This shall be accomplished by utilizing
the hand-off-auto switch and manual speed potentiometer on each variable
frequency drive control panel.
The control system shall include a failure alarm for each pump. Each alarm shall
include a minimum differential pressure set point and a low NPSH alarm;
adjustable time delay, alarm indication and manual reset. Upon a pump failure
alarm, the pump shall be stopped and locked-out of service until the alarm is
manually reset. A pump failure alarm shall automatically replace the failed pump
with the next pump in the sequence. Current transformers or internal variable
frequency drive circuitry is not acceptable.
Electronic pressure sensors shall be provided on the suction and discharge of each
pump and on the suction and discharge headers. Sensors shall be stainless
construction and rated to withstand 10,000 psi. Sensors shall each send a 4-20
mA output signal to the control panel. Sensor accuracy shall be +-.25%. Certified
test shall be provided for each sensor, verifying accuracy to NIST. Cabling for the
sensors shall be run back to the control panel and shall be protected by fiberglass
enclosure. Cables shall be terminated into removable plugs inside of control panel
is to facilitate service. Display pressures on HMI.
The sequence control enclosure shall be of multiple compartment construction.
Main incoming power lugs with over-current protection shall be housed in a
dedicated compartment, and pump-sequencing controls shall be housed in a
dedicated compartment. Panels constructed with barriers or partitions are
unacceptable. Power supply shall be 460 Volt, 3 Ph, 60 Hz. System shall be
braced for 65,000 AIC. Running power through one section to another is not
acceptable.
Graphical Controller and Enclosure
All control components other than the remote sensors shall be mounted in a single
enclosure. The enclosure will be of metal construction for rejection of EMI and
RFI signals. The enclosure material shall be as a minimum 12 gauge steel and
shall conform to NEMA standards for type 4. The enclosure shall include
mounting legs for freestanding floor mount installation. The control panel shall
be UL listed as an assembly. The controls shall include all components and
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wiring to perform the necessary operations. The panel shall include terminal
block connections for the external sensors and remote telemetry contacts.
The control panel will include an incoming service three phase monitor to protect
against phase loss, under voltage and phase reversal conditions. The phase
monitor will include an LED that will illuminate when all line conditions are
normal. The phase monitor will further include an adjustable operating voltage
range of 430-480 VAC. A panel mounted indicating light shall be provided to
annunciate “Power Normal” status.
A secondary Surge Arrester suitable for service entrance locations conforming to
NEC article 280 shall be included in the control panel. The surge arrestor shall
meet ANSI/IEEE C62.11-1993 requirements. The surge arrester shall include
LED indication for operating status of each phase.
The control panel will include one thermal-magnetic molded case circuit breaker
per motor. The combination of the motor circuit protector and the VFD overload
feature shall protect the motor from short circuit and thermal overload conditions.
The circuit breaker shall be of the permanent trip type, UL listed with a minimum
of 600 Vac, 18kA interruption rating. The AC magnetic trip setting shall be sized
for the appropriate motor load. Each motor circuit breaker will include a thru the
door disconnect operator. Disconnect operator will include “locked in off”
position feature. Motor nameplate amps, FLA, shall be used for setting of both
the overload and short circuit limits allowing ample capacity on the motor circuit
protector for normal starting current draw.
The system logic shall be by a microprocessor-based controller and shall include
an operator interface unit for display of system variables and adjustment of
designated set points. Field programming shall be password accessible.
The operator interface unit shall offer the following features:
A. Touch screen interface
B. Graphical object capabilities
C. Text display
D. Alarm capabilities with history, count and detail
E. Built in clock
F. Screen and object password protection, up to eight user defined levels
G. Minimum of 256K internal memory
H. NEMA and UL type 4 enclosure
I. UL listed
All system messages will be displayed in plain English with standard engineering
units.
System logic shall be preprogrammed by the panel vendor. The microprocessor
controller shall include the following minimum configuration:
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A.
B.
C.
D.
E.
F.
G.
H.
I.
20 discrete inputs
16 discrete outputs
4 analog inputs
2 analog outputs
2 communication ports
4-I/O expansion slots
Non volatile memory
PID programming capability and floating point math
Real time clock
The control panel shall include individual pump hand-off-auto selectors. The
selectors shall be mounted external through the panel door and shall be NEMA
4X rated.
The control panel shall include a common audible alarm horn to annunciate a
fault condition. Specific cause of fault will be displayed on the HMI. The control
panel shall be supplied with a horn silence pushbutton.
The system will include a 120 Vac step down transformer for systems were the
primary line voltage exceeds 120 Vac. Transformer primary and secondary will
be fuse protected.
A door handle shall be provided for each panel disconnect switch so that power
circuits are turned off before the door is opened. Electric wiring shall be
completed between cubicle, electric motors, and system mounted controls.
Each control enclosure controller shall be equipped with communications
module(s) and cabling such as to allow transfer of data needed during periods of
emergency operation, and for transmission of data to the building automation
system. Communications module(s) and cabling shall be BACNet compatible.
Electrical wiring shall be run in conduit. Conduit shall be Electrical metallic
conduit (EMT) and shall be constructed of galvanized steel with a minimum trade
size of 1/2". UL listed aluminum or galvanized steel split type fittings shall be
used. EMT shall be used to enclose conductors exterior to all enclosures, panels,
and motor terminator boxes.
Exception: UL listed liquid tight flexible metallic conduit may be used for motor
connections and all control devices with a maximum length of three feet without a
grounding conductor and unlimited length with a grounding conductor.
Application and installation shall meet all requirements of NEC articles 300, 348,
and 351.
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K. Transmitters
Differential Pressure Transmitters
The packaged pump system manufacturer shall provide five complete, selfcontained, variable capacitance type differential pressure transmitter(s) equal to a
Rosemount "Smart Transmitter" No. 1151. The transmitter(s) shall be installed
by the contractor where indicated on the drawings. Wiring terminals and
electronics shall be in separate compartments, so the electronics remain sealed
during installation. Reverse polarity protection shall be included to keep wiring
mishaps from damaging the transmitter. Wiring between the control system and
the transmitter(s) shall be Belden 9320, two wire, shielded twisted cable, and shall
not be included in conduit containing AC circuit wiring.
Design range shall be as required by system. External zero and span adjustments,
over-pressure to 2,000 PSI, and no humidity effects.
Minimum accuracy shall be 0.25% of calibrated span. Includes combined effects
of linearity, hysteresis and repeatability. Stability shall be 0.25% of upper range
limit for six months. No internal mechanical linkages shall be used in the
transmitter(s).
Flow Meters
The packaged pump system manufacturer shall provide zero dual turbine,
insertion type flow meter(s) equal to a Onicon SF1210. Wiring installed by the
contractor between the control system and the meters shall be Belden 9320, two
wire, shielded twisted cable, and shall not be included in conduit containing AC
circuit wiring.
The meter shall have two contra-rotating axial turbines, each with its own
rotational sensing system, and an averaging circuit to reduce measurement errors
due to swirl in undeveloped flow locations caused by short straight pipe runs.
Rotational sensing of each turbine shall be accomplished electronically by sensing
impedance change and not with magnetic or photoelectric means. Paddle type
rotors will not be acceptable.
The sensor shall have a maximum operating pressure of 400 PSI, maximum
operating temperature of 180 deg F (optional 300 deg F peak) and a pressure drop
of less than 1 PSI at 17 feet per second flow velocity. Flow sensor shall have
175:1 turndown ratio. Accuracy shall be within +-0.5% of actual reading at the
calibrated typical velocity, and within +-2% of reading over a 50:1 turndown
(from 0.4 to 20 ft/s). Each sensor shall be individually wet-calibrated in a flow
laboratory against a primary volumetric standard accurate to within 0.1% and
directly traceable to the U.S. National Institute of Standards and Technology
(NIST). Provide certificate of calibration with each flow meter.
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The sensor shall have integral analog outputs of 0-10 VDC and 4-20 mA linear to
within +-0.1% of calibrated span for connection to the control system. The sensor
shall also include three internal frequency outputs, (top turbine, bottom turbine,
average frequency) for commissioning and diagnostic purposes. All outputs shall
be linear with flow rate.
The turbine elements shall be made of polypropylene with sapphire jewel
bearings and tungsten carbide shafts. The flow sensor shall be constructed of
plated brass with an aluminum electronics enclosure and gasketed cover.
The unit shall be provided with hot tap installation, in order to be both insertable
and removable through a ball valve when the pipe is under pressure.
Temperature Transmitters
The packaged pump system manufacturer shall provide two self-contained RTD
type temperature transmitters.
The temperature transmitters shall each receive its power input and send its
current output (4-20mA) over the same pair of low voltage wires. Each
transmitter head shall be explosion proof.
The temperature probe shall use a platinum, wire wound, sensing element in a
316SS sheath, spring loaded, and inserted into a 3/4" NPT stainless steel
thermowell with explosion proof process fittings and connection head. The
thermowell shall penetrate one-half the pipe diameter.
The temperature range shall be [32-122 Deg F (0-50 Deg C) for chilled or
condenser water] and [32-392 Deg F (0-200 Deg C) for hot water]. For
applications measuring the supply and return temperatures for a loop type water
system, the two probes shall be a matched pair.
The total system accuracy of the temperature transmitter/probe assembly shall be
+/-01.00% of span; the sensing element and the transmitter shall be individually
calibrated and traceable to NIST.
The stability of the transmitter/probe assembly shall be +/-0.01% of span/Deg C
change in ambient temperature, +/-0.001% of span/volt change in line voltage,
and +/-0.001% of span/100 ohms of lead resistance.
Wiring installed by the contractor between the control system and the transmitters
shall be equal to Belden 9320, 2-wire, shielded, twisted cable and shall not be
included in conduit containing wiring for alternating current.
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All temperature transmitters shall be packaged mounted and wired where
possible. All remaining transmitters not package mounted shall be field installed
and wired by the temperature controls contractor.
L. Building automation system
The pump package system manufacturer shall provide a direct communication
interface as an integral part of the package. The communication interface shall be
BACnet. Any interface to convert from any communication driver to Bacnet is the
responsibility of the pump package manufacturer. The communication interface
shall transmit to each packaged pump system and receive from each packaged
pump system the following points:
1. Transmit:
a. System Request to Start
(Digital)
2. Receive:
a. Equipment on/off status (Each pump)
b. Equipment failure alarms (Each pump)
c. Pump suction pressure (Each pump)
d. Pump Discharge pressure (Each pump)
e. Suction pressure (Each connection)
f. Discharge pressure (Each connection)
g. Chilled water flow
h. Chilled water system kW
i. Chilled water zone differential pressure
j. Chiller differential pressures
k. Pump speed (Each Pump)
l. System supply temperature
m. System return temperature
(Digital)
(Digital)
(Analog)
(Analog)
(Analog)
(Analog)
(Analog)
(Analog)
(Analog)
(Analog)
(Analog)
(Analog)
(Analog)
2.04 Finishing
A. All steel components shall be cleaned, degreased and painted with a rust
preventive primer.
B. The complete packaged pump system shall be factory painted with machine
enamel prior to shipment.
Part 3 Execution
3.01 Installation
A. Install the packaged pump system in accordance with manufacturer's instructions.
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B. The contractor shall align the pump and motor shafts to within the manufacturer's
recommended tolerances prior to system start-up.
3.02 Demonstration
A. The system manufacturer or his representative shall provide one on-site job visit
for commissioning of the water management system. The packaged pump system
manufacturer’s commissioning shall include final checkout, adjustment, and startup. Prior to commissioning, the installing contractor shall perform a preliminary
check for proper installation. Commissioning shall occur only after all hook-ups,
tie-ins, and terminations have been completed and signed-off on the system
manufacturer’s start-up request form by the installer. At that time, all ancillary
equipment (i.e. chillers, boilers, cooling towers, BAS systems, air handlers, etc.)
shall be ready for automatic start-up.
B. The final visit will include the system manufacturer or his representative to
provide a minimum of four (4) hours of on-site training for the owner's personnel
on the operation and maintenance of the packaged pump systems.
C. The package manufacturer shall warrant all parts for a period of 12 months from
startup.
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