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GENERAL
FEATURES
These are
some general paragraphs that are use to clarify and supplement the TRICOIL®
specifications.
ENHANCED
HUMIDITY CONTROL SYSTEM
Where
specified or where indicated on the drawings, provide an enhanced humidity
control system as described herein. The base bid system shall be the patented
TRICOIL® method of air conditioning for enhanced temperature and
humidity control. The TRICOIL® components shall be furnished as a
coordinated package by the air handling unit manufacturer. Contact Sensible
Equipment Company, P.O. Box 669, Goldenrod, Florida 32733, telephone number
(407) 296 - 8068, Fax Number (407) 296 - 7420.
Alternates to
the base bid are encouraged. The contractor may furnish, with the engineers
approval, a deductive alternate to the base bid to use other equipment or
methods that provides performance as scheduled. Alternate bids must be submitted
in writing with complete engineering analysis including equipment performance
data, psychrometric analysis with chart, flow diagrams, equipment
specifications, manufacturer's descriptive literature, reduction in bid amount,
and other information required by the engineer to analyze the proposed
alternate. The alternate must include any and all costs for the work of other
trades required to provide complete and operational equivalent systems. The
contractor shall assume single source responsibility for all the subsystems that
he chooses to integrate and submit for his alternate bid. All responsibilities
for equivalencies for the performance of the alternate system or method to the
base bid system or method plus the coordinated supporting central plant
utilities (electrical and/or mechanical) plant shall constitute a required
single source responsibility and shall be so acknowledged by the contractor with
the alternate proposal.
The air
handling units shall have the following features:
 | TRICOIL®
method of enhanced humidity control having capacities as indicated or
scheduled with components as specified and/or indicated on the drawings.
| Primary cooling coil
shall be chilled water or direct expansion cooling as specified.
| A recuperative
precooling/reheat system shall be provided that shall exchange energy from
the mixed outside air and return air stream (or the 100% outside air stream
as applicable) to the supply air stream for simultaneous precooling and
reheating. The base bid system shall use a hydronic piping loop and
circulating pump. Alternate systems may use a desiccant heat exchanger, heat
pipe loop, or an air to air heat exchanger. Space shall be provided between
each coil and heat exchange surface for cleaning. A method of controlling
the amount of energy exchange from 0% to 100% of rated capacity between the
reheat and precooling elements shall be provided for part load performance.
| Supplemental reheat:
The base bid TRICOIL® method shall use the hydronic reheat coil
to provide the supplemental reheat energy to the supply air stream. The
supplemental reheat energy shall be from the hot water source as indicated
on the drawings.
| Preheat: The base bid
TRICOIL® method shall use the precooling coil to provide the
preheat function to provide preheat energy for freeze protection and heating
duty as required. The heating energy shall be from the hot water source as
indicated on the drawings.
| Coordinate access door
locations with the air handling unit manufacturer. Access space must be
provided between each coil for servicing and cleaning purposes. Provide
service doors in access sections. |
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TRICOIL®
METHOD KITS FOR FIELD ASSEMBLY
The TRICOIL®
method is a recuperative wrap around type system providing simultaneous
precooling and reheat for temperature and humidity control. The TRICOIL®
method shall also provide heating and supplemental reheat control where
indicated. The TRICOIL® method Kits include components which shall
be field assembled and wired by the installing contractor. The TRICOIL®
method Kits shall consist generally of the following components:
| Site specific license
for the specified TRICOIL® system with capacity as scheduled or
as indicated.
| Pump and motor, pump
motor starter for three phase motors and pump control relay for single phase
motors.
| TRICOIL®
loop control valves with actuators. Quantity, and type of valves and
actuators shall be as required to match the operating sequence and as
indicated on the drawings. (Chilled Water Control Valve is not included with
the TRICOIL® components and shall be provided by the temperature
control contractor).
| TRICOIL®
loop water balancing valve shall be a circuit setter type or flow control
type as indicated. The heating hot water flow control valve, where
indicated, shall be an automatic flow control type. |
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TRICOIL®
METHOD PUMP/VALVE ASSEMBLIES
The TRICOIL®
method is a recuperative wrap around type system providing simultaneous
precooling and reheat for temperature and humidity control. The TRICOIL®
method shall also provide heating and supplemental reheat control where
indicated. The TRICOIL® method components shall be provided for
field installation and wiring by the installing contractor. The TRICOIL®
method components shall consist generally of the following:
| Site specific license
for the specified TRICOIL® system with capacity as scheduled or
as indicated.
| Pump and Valve
Assemblies complete with pump and motor, pump motor starter, differential
pressure switch, control valve(s), balancing valve(s), and piping with drain
and vent. Components shall be factory assembled in an insulated enclosure
with a drain pan. Pump motor, starter, control valve(s), pressure switch,
pump status light, and hand/off/auto switch shall be factory wired to a
numbered terminal strip ready for connection to the electrical power supply
and to the temperature control system.
| TRICOIL®
loop control valves with actuators. Quantity, and type of valves and
actuators shall be as required to match the operating sequence and as
indicated on the drawings.
| TRICOIL®
loop water balancing valve shall be a circuit setter type and heating hot
water flow control valve, where indicated, shall be an automatic flow
control type. |
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PUMPS FOR KITS AND
ASSEMBLIES
The pump shall be an
In-line type or In-line Booster type as scheduled or other approved. Pump
characteristics shall be as scheduled on the drawings.
| In-line Pumps shall be
Bell and Gossett Series 80 or other approved. Pumps shall be suitable for
vertical or horizontal installation. Pumps shall be close coupled, single
stage design and shall be capable of being serviced without disturbing the
piping. Pump casing shall be Class 30 cast Iron. Impeller shall be cast
bronze, enclosed type and shall be dynamically balanced. Pumps shall be
rated for 175 psig working pressure. Pumps shall have gauge tappings at the
suction and discharge nozzles and shall include vent and drain proof ports.
Motors shall be Totally Enclosed, and shall meet NEMA specifications. The
motors shall be non-overloading at any point on the pump's performance
curve. Pumps shall be factory tested. Pumps shall be factory painted with
high-grade machinery enamel paint.
| Inline Booster Pumps
shall be Bell and Gossett Series PL or other approved. Pumps shall be of the
horizontal, permanently lubricated type with steel shaft, ball bearings, and
water tight seals. Pump body shall be cast iron or bronze, face plate shall
be stainless steel. Impeller shall be non-metallic. Mechanical seal faces
shall be carbon on silicon carbide. The motor shall be non-overloading at
any point on the pump performance curve. The pump motor shall be open drip
proof, sealed ball bearing, quiet operating construction the motors shall be
split capacitor type with thermal overload protection. Pumps shall be
suitable for operation at 225 degrees F at 150 psig working pressure.
| The pump shall be a
Taco Cartridge Circulator pump or other approved and shall have a bronze
casing, a non-metallic impeller, a ceramic shaft, flanged connections,
permanent split capacitor motor with overload protection. Pump and motor
shall be selected for non-overloading operation. Pump characteristics shall
be as scheduled on the drawings. |
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VALVES FOR KITS AND
ASSEMBLIES
The valves used in the
TRICOIL® system shall be of the type as scheduled or other approved.
Characteristics shall be as scheduled on the drawings.
| Control valves (Plan
Mark CV) shall be three port ball valves as indicated on the drawings.
Valves shall have bronze bodies with female NPT threads. Valves shall have
blowout proof stem design, glass reinforced Teflon thrust seal washer and
stuffing box ring with minimum 400 psi rating. Stem packing screw shall be
adjustable for wear. Valve ball shall be chromium plated bronze and shall be
rated at a minimum of 400 psi WOG, cold, non-shock service. All valves shall
be provided with reinforced Teflon seats.
| Control valve actuators
shall be fully modulating or two position as indicated in the control
sequence. Modulating valves shall be positive positioning, responding to a
2-10 VDC or a 4-20 mA signal (with the addition of a 500 ohm resistor).
There shall be a visual valve position indicator and an actuator generated
2-10 VDC valve position output signal for electronic feed back to the
control system. Valve power required shall be 24 VAC and power consumption
shall not exceed 8 watts at 24 VAC. The actuator shall provide minimum
torque required for proper valve close-off. The actuator shall be designed
for use with current limiting motor overload protection or shall have
adjustable single pole double throw travel stop limit switches. A release
button or handle on the motor shall be provided to allow for manual
override, except when using spring return valves. All valves shall be UL
listed.
| Balancing Valve, (Plan
Mark BV) shall be a circuit setter type balancing valve as made by Taco or
other approved. The valve shall be bronze body through 2 inch diameter, all
brass interior parts, sweat or NPT pipe connections, schrader style pressure
ports for attachment to a differential pressure gauge, (gauge not included),
drain port, blow-out proof stem, calibrated nameplate with tamper resistant
memory stop, and o-ring seal. Valves through 2 inch diameter shall be rated
to 300 PSI, 250 degrees F.
| Flow Control Valve
(Plan Mark FCV) shall be a Griswold Miniature style flow control valve or
other approved capable of controlling flow to within +/- 5% accuracy through
the specified pressure differential range of the valve. Valve body shall be
ductile iron body through 1.5 inch diameter and flow rates from 0.33 to 34
GPM and shall have female NPT end connections, stainless steel flow control
assembly, dual 1/4 inch pressure/temperature test valves for measuring
pressure or temperature in the system (gauges not included), shall be
permanently marked to show direction of flow, model number and differential
pressure control range. |
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