MPS Master
SECTION 23 25 00
HVAC WATER TREATMENT
PART - GENERAL
SUMMARY
Section Includes: Include labor, materials, equipment, and accessories necessary to furnish and install water treatment for heating hot water/glycol, condenser water, and chilled water/glycol supply and return piping.
Contractor shall test existing hot water heating system and chilled water system prior to doing any work for percent glycol, iron and copper content, pH level, type of glycol, and for any oil in existing system. After work is completed restore system back to original concentration. Contractor shall store glycol drained from system to do construction changes. When refilling the system, Contractor shall filter the system per the requirements of this Section.
SUBMITTALS
Shop Drawings: Submit a portfolio showing water treatment equipment to be used and quantity of water treatment per system for approval by Architect/Engineer.
Test Results:
Submit glycol strength test results for both the heating water/glycol solution and the chilled water/glycol solution.
Submit test results for flushing of the piping systems before water treatment is added to water treatment to the piping system.
QUALITY ASSURANCE
Regulatory Requirements:
State Building Code
Local Codes and Ordinances
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SECTION 23 25 00
Local Authority having jurisdiction
WARRANTY
General Requirements: Replace glycol solution lost from system from any cause other than neglect by Owner during the first year of operation.
Defects: Thoroughly check system and make necessary corrections if system continually loses solution.
PART - PRODUCTS
MANUFACTURERS
Acceptable Manufacturers for Propylene Glycol: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:
1. Fremont Industries, Inc.
2. The Water Solutions Group
3. Jaytech, Inc.
Acceptable Manufacturers for PreCleaning Chemical: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:
1. Fremont Industries, Inc.
2. The Water Solutions Group
3. Jaytech, Inc.
Acceptable Manufacturers for Inhibitors (NonGlycol Systems): Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:
1. Fremont Industries, Inc.
2. The Water Solutions Group
3. Jaytech, Inc.
Acceptable Manufacturers for Condenser Water Treatment System: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:
1. Fremont Industries, Inc.
2. The Water Solutions Group
3. Jaytech, Inc.
CLOSED LOOP WATER BASED GLYCOL SYSTEMS
A. General Requirements: Systems shall be provided with Fremont 9134 or Owner approved equal, an industrially inhibited propylene glycol based heat transfer fluid.
B. Fluid Material: The glycol fluid to be used in these systems shall meet the following requirements.
The fluid shall be industrially inhibited glycol (phosphate based).
The fluid shall be easily analyzed for glycol concentration and inhibitor level, and shall be easily reinhibited using inhibitors readily available from the fluid manufacturer.
A system containing more than 250gallons of fluid, shall receive an annual analysis provided free of charge by the fluid manufacturer. Manufacturer shall also market convenient analytical test aids for use by the operator of the smaller systems.
The fluid shall meet the requirements of ASTM D1384 (less than 0.5mils penetration per year for all system metals).
System Design Considerations:
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HVAC Water Treatment
MPS Master
SECTION 23 25 00
Automatic water makeup systems to prevent undetected dilution of the glycol solution shall not be used.
Technical Data:
Composition by Weight (30 Percent Glycol Solution):
Glycols: 95.5
Inhibitors and Water: 4.5
Color: Colorless
Specific Gravity at
60/60 Degrees F: 1.05 - 1.60
pH of Solution Containing
50 Percent Glycol: 9.0 - 10.0
Reserve Alkalinity, Minimum: 10.6 ml
Application:
Systems: Provide glycol solution heat transfer system for:
Chilled Glycol/Water Solution From Chiller: [30] [50] [____] Percent Glycol
Heated Glycol/Water Solution From Heat Exchanger: [30] [50] [____]Percent Glycol
***** USE THE FOLLOWING PARAGRAPHS IF OWNER IS FURNISHING CONDENSER WATER TREATMENT SYSTEM *****
CONDENSER WATER TREATMENT SYSTEM
General: Water treatment system and control shall be provided by the Owner. This Contractor shall provide pipe tappings in each piping system for the following:
Combination pH and Conductivity Controller with Flow Through Probes, Flow Switch, and Lockout Timers
Bleed-Off Solenoid Valve and Y-Strainer
Chemical Metering Pumps
Chemical Injection Assemblies
CONDENSER WATER TREATMENT SYSTEM
Equipment: Contractor shall install the following, including required external piping and wiring. Equipment shall be:
Combination OPR and Conductivity Controller with Flow Through Probes, Flow Switch, Lockout Timers and Automatic Biocide Feed
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Bleed-Off Solenoid Valve by Belimo and Y-Strainer
Chemical Metering Pumps
Chemical Injection Assemblies
Water Treatment Controller: Furnish a cooling tower conductivity and ORP controller with (2)tagable feed timers, (1)extra assignable control relay, flow switch assembly, (2)water meter inputs, and (5)digital inputs. Controller shall accept an input line voltage of 95to 240VAC (50/60Hertz), and produce an output relay voltage of 115VAC (5amp, individuallyfused relays). Manual activation of relay outputs shall be accomplished through the use of HOA keys with userdefined timeouts. Controller shall be furnished with an on/off switch, 8foot male power cord, and (5) 6inch female output receptacles. Controller shall be programmable via a tactilefeedback ATMstyle keypad, and shall feature a 16line full graphic LCD display. Controller shall be housed in a NEMA 4X type housing with a padlockable, gasketed clear viewing door and shall be carry an approved agency listing (UL, ETL, or CSA). Controller shall include a 3/4inch, Schedule 80, PVC bypass assembly containing a conductivity probe and tee, flow switch and tee, and sample port with shutoff valve rated to 100psi and 140degreesF.
Conductivity Control Circuit: Conductivity control circuit shall measure from 0to 10,000 S in 1microsiemen increments. Controller shall feature an adjustable set point, differential, high alarm, low alarm, and bleed limit timer. Conductivity control circuit shall energize a 115VAC, 5amp, individuallyfused relay tied to a bleedoff valve when the system conductivity exceeds the set point, and shall remain energized until the system conductivity falls below the differential level. All set points and alarm levels shall be adjustable over the full conductivity measurement range.
ORP Control Circuit: ORP control circuit shall measure from minus 1,000mV to plus 1,000 mV in 1millivolt increments. Controller shall feature an adjustable set point, differential, high alarm, low alarm, and bleed feed timer. ORP control circuit shall energize a 115VAC, 5amp, individuallyfused relay tied to a brominator valve or chemical pump when the system ORP falls below the set point, and shall remain energized until the system ORP rises above the differential level. All set points and alarm levels shall be adjustable over the full ORP measurement range.
Taggable Timers: Controller shall feature (2)taggable feed timers which shall be selectable between (5)different activation modes (pulse, percentage, limit, post bleed, and 28day clock). Timers shall each activate a 115VAC, 5amp, individuallyfused relay tied to a chemical feed pump.
Additional Control Relay: Controller shall feature an additional 115VAC, 5amp control relay which shall be activated by any userdefined alarm or control feature.
Flow Switch: Controller shall include a flow switch to prevent activation of relays in the event of "no flow" through the flow assembly.
Digital Inputs: Controller shall include (5)digital (dry contact) inputs for use with optional low drum level wands, status inputs, or other switch closures as assigned.
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OnBoard History Collection: Controller shall automatically gather operating data, including conductivity, ORP, temperature, makeup water volume, bleedoff water volume, calculated evaporation volume, and other specified digital and analog inputs at useradjustable intervals. Controller shall include a builtin "service report" tool for the manual entry of up to (10)userdefined test parameters (i.e. alkalinity, hardness, etc.). Controller shall retain all history in its onboard memory for a period of no less than 1calendar year. Controller shall be able to present all data in both graphical and tabular format on the controller display without the need to export the data to another source.
Manufacturer: Controller shall be Advantage Controls, Model SSCRF3E, or Owner approved equal.
BleedOff Solenoid Valve and Y Strainer:
A bleedoff assembly consisting of a Belimo solenoid valve and Y strainer, sized to the specific system capacity and pressure, shall be provided.
The bleedoff solenoid valve shall be ASCO, Model 8210D, or Owner approved equal, consisting of a brass body, NEMA 1 enclosure rated at 120volts.
Chemical Feed Pump:
Chemical feed pump shall be an electronic metering positive displacement type pump.
Feed rate shall be adjustable while the pump is operating.
Size pump to the system pressure and output capacity.
Polyethylene suction and discharge tubing shall be supplied, along with foot valve and injection valve.
Electrical requirements shall be 100 VAC, 60 Hertz.
Injection Assembly:
An injection assembly of PVC design shall be installed for injection of chemicals into the condenser water lines.
Water Treatment Chemicals: Furnish 2year supply of recommended chemicals for prevention of scale, corrosion, and microbiological growth in open recirculating system. Furnish chemicals in a liquid form, not containing ingredients which may be harmful to system materials of construction.
Water treatment company shall provide a water treatment service program for a period of 2years from system startup. This program shall include startup assistance, plant personnel training, periodic service calls, and inspection of system equipment.
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MPS Master
SECTION 23 25 00
Test Equipment: Basic water test equipment, including carrying case and reagents for use with suppliers products, shall be furnished with system and shall include apparatus for determining pH, treatment residual, and bleedoff control.
PART - EXECUTION
PREOPERATIONAL SYSTEM CLEANOUT FOR HYDRONIC SYSTEMS
PreCleaning Chemicals: New and existing piping systems and appurtenances shall be cleaned with a solution (2quarts per 1,000 gallons of system volume) of Fremont Industries, Neutral pH Cleaner F9108, for a minimum of 36hours before draining and flushing, or Owner approved equal, to remove any iron deposits, oilbased coatings, mill scale, and construction residues. This product cleans and pacifies the piping system to reduce flash corrosion before water treatment (inhibitors) are installed.
Trisodium Phosphate is not an equal product.
Cooling and Heating Water Systems: The chiller, condenser, chilled water lines, and related cooling equipment, boiler, heat exchangers, heating piping, and related heating equipment shall be thoroughly flushed out with precleaning chemicals, as specified above, designed to remove deposits such as pipe dope, oils, loose rust, mill scale, and other extraneous materials.
Particular attention shall be given to:
Pump Packing Glands or Mechanical Seals
Valve Seats and Glands
Flange and Union Faces or Seats
Strainers, Orifices, Gauge Glasses
Add recommended dosages of manufactured and blended precleaner chemical products and circulate throughout the water system. Drain, fill, and flush water systems until no foreign mater is observed and the total alkalinity of the rinse water is equal to that of the makeup water.
Be sure pumps are properly aligned and bolted down before startup to prevent damage to bearings, seals, or couplings.
Clean strainer screen (pump and coils) after each flush. Furnish and install new strainer screens prior to filling system for operation. Remove pump suction diffuser startup strainer after flushing is complete. When refilling system with clean water, vent all high points and equipment of air and gases.
Mixture may be heated to 140degreesF and circulated through the system; heating of the system may improve cleaning ability or shorten duration of the precleaning process. Refer to manufacturer's instructions.
Upon completion of installation, make final adjustments of water system. These adjustments include:
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Balancing of all piping circuits, coils, and terminal units to required flow rates.
Adjusting of all pumps to operate at satisfactory flows and heads.
Checking of all controls for proper operation and setting.
Water Quality Tests: At the conclusion of flushing, after hydronic system installer has verified that all system valves (shut-off, balancing, and control) are open, and prior to normal use of the systems, a minimum of (6) water samples shall be drawn from various parts of the system which shall be analyzed by an independent testing agency. Samples shall be drawn by the testing agency in the presence of the Owner’s representative. Contractor shall bare the cost of testing and retesting the water.
When the Project has multiple phases or sequences, the Contractor shall perform tests at the beginning of each phase or sequence and prior to making modifications or tieins to existing or previously installed piping systems to determine the following: correct glycol type and percentage, pH level, water quality (hardness), and presence of oil and grease in the piping system.
Provide the Engineer and Owner with a Freon Extractable Test for each system, to assure the Engineer and Owner that there are no oils and greases in the hydronic systems. This test shall be taken after all of the hydronic systems are in service and have been operating for a minimum of 2weeks, and prior to adding glycol or inhibitors to the system.
If the system is found to be contaminated, the Contractor shall notify the Owner’s representative for direction of corrective action. Contractor accepts responsibility for existing or previously installed systems if it fails to test systems prior to making modifications.
Provide an EPA 413.1 test before modifying an existing glycol system to determine if oil or grease is present in the glycol piping system.
If tests indicate contamination above 0.8 parts per million of suspended black iron oxide, or other foreign material, the flushing shall be repeated and retested until the entire system complies.
Contractor shall work in conjunction with the Owner's chemical treatment representative, the Temperature Control Contractor, and the Balancing Contractor to ensure complete flushing has been accomplished.
When glycol is specified to be used in the system, the Contractor shall coordinate with the glycol supplier to ensure water quality is met prior to filling with glycol.
PREOPERATIONAL AND OPERATIONAL STEAM AND CONDENSATE SYSTEM CLEANOUT
PreCleaning: New steam and condensate piping, fittings, valves, and appurtenances shall be cleaned prior to installation to remove any iron deposits, oilbased coatings, mill scale, and construction residues.