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Passivation

When new systems are first commissioned, special measures should be taken to ensure that galvanized steel

surfaces are properly passivated to provide maximum protection from corrosion.

Passivation

is the formation of a

protective, passive, oxide layer on galvanized steel surfaces.
To ensure that galvanized steel surfaces are passivated, for the first 6-8 weeks of operation, the pH of the tank

water should be maintained between 7.0 and 8.2 and calcium hardness maintained between 100 and 300 mg/l (as

CaCO

3

). The passivation is complete and effective when the new zinc surfaces turn dull grey in colour. If white

deposits form on galvanized steel surfaces after the pH is returned to normal, this is a sign of white rust, and

therefore, the passivation process should be repeated to insure proper passivation and maximum corrosion

resistance.
In case that your water quality does not allow the pH to remain below 8.2, then you should consult a water

treatment specialist for advice on pH reduction or special passivation agents to promote proper passivation.

Special Water Treatment Considerations

ICE TANK WATER

Since ice tanks can be on and off during the course of the year, it is possible for microbiological growth to

develop. Therefore, the best practice hygiene recommendation is for a dosage of non-oxidizing biocide

once/year. If the unit is an external melt, the biocide should be added after the unit is brought down for cleaning

and during the refill process, to insure proper mixing

Following passivation, if the tank water is corrosive in nature (low hardness, low pH or alkalinity), the addition

of a corrosion 'non-precipitating' corrosion inhibitor is recommended. Examples of 'non-precipitating' corrosion

inhibitors are nitrites, molybdates and silicate based blends. Care must be taken not to use corrosion inhibitors

that raise the conductivity > 700 µS/cm, or alter the freezing point of the water. Therefore, such decisions need

to be taken with the advice of a water treatment specialist. For example, if the ice water needs food grade

approval because it could contaminant food products, then the silica based treatment programme is normally

used, if it meets food grade regulations.

GLYCOL SIDE OF THE ICE COIL

Only use "inhibited" glycol that contains pH buffers. Never use industrial grade ethylene glycol. The reason for

this recommendation is that over time, glycol degrades and produces "glycolic acid" as a result. These acids

reduce the pH of the circulating water, and this will cause corrosion of steel materials of construction.

As an added protection, the glycol loop should be treated with a nitrite, molybdate or silicate-based corrosion

inhibitor to promote metal passivation, and provide additional alkalinity to raise the pH above 9.0. Always

consult a water treatment specialist for recommendations on which corrosion inhibitor is most effective for your

specific water quality

W W W . B A L T I M O R E A I R C O I L . E U

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Summary of Contents for ICE CHILLER TSU-C-D

Page 1: ...TSU C D ICE CHILLER Thermal Storage Unit OPERATING AND MAINTENANCE INSTRUCTIONS MTSU C Dv04EN...

Page 2: ...it is advisable to have a copy of the unit s certified drawing available for reference during inspection and maintenance If you do not have a copy of this drawing or need further information about th...

Page 3: ...3 When operating in ambient temperatures below freezing the unit should be inspected more frequently W W W B A L T I M O R E A I R C O I L E U 3...

Page 4: ...5 About Water Care 15 Passivation 16 Special Water Treatment Considerations 16 5 Cold Weather Operations 17 About Cold Weather Operation 17 Insulation of Piping 17 Protection Against Coil Freezing 17...

Page 5: ...A L T I M O R E A I R C O I L E U 5 CONSTRUCTION DETAILS ICE Chiller EXTERNAL MELT APPLICATION 1 Tank 2 Insulation 3 Exterior Panels 4 Air Pump 5 Covers 6 Galvanised Steel Coil 7 ICE LOGIC Ice Thickn...

Page 6: ...id Compatibility Fluids circulated through the coil s must be compatible with the coil construction material Standard coils are constructed of black steel Coil design pressure max 10 bar Max temperatu...

Page 7: ...ated systems and controls and the procedures set forth in this and other relevant manuals Proper care procedures and tools must be used in handling lifting installing operating maintaining and repairi...

Page 8: ...ss control to be sure it is securely mounted and has not been damaged Check control wiring for proper connections 9 Caulk around the base of the tank caulk is provided with the unit 10 Inspect and lea...

Page 9: ...eck the water level and adjust if required Caution DO NOT OVERFILL OVERFLOWING THE TANK MAY DAMAGE THE INSULATION AND OR CAUSE THE OPERATING CONTROLS TO MALFUNCTION 4 Adjust water distribution using b...

Page 10: ...ignificant horizontal bridging blockage is apparent in the unit at the end of the ice build cycle and when low leaving temperatures are obtained ICE BUILD DIRECT REFRIGERANT FEED 1 Begin the ice build...

Page 11: ...tank and the cooling load 5 Upon receiving a signal from the plant control system to stop the ice melt cycle turn off the chilled water pump s and the air agitation blower s and close the chilled wat...

Page 12: ...before the chiller should start again An override switch to start stop cooling machine Ice quantity indication LED s to show ice quantity available Other control devices such as time clocks and water...

Page 13: ...level Instead of using the switch the contacts 25 26 27 can be used A short circuit of 1 sec between 25 27 makes the compressor start a short circuit between 26 27 makes the compressor stop Remote Con...

Page 14: ...e 7 2 mA 20 40 ice 10 4 mA 40 60 ice 13 6 mA 60 80 ice 16 8 mA 80 100 ice 20 mA 100 ice There will be no intermediate mA output as measurement is based on a 6 step measurement only Electrical specific...

Page 15: ...llowing guidelines See Table below Recommended Tank Water Quality pH 7 0 to 9 0 Hardness as CaCO3 90 to 500 mg l Alkalinity as CaCO3 500 mg l max Total Dissolved Solids 1000 mg l max Chlorides 125 mg...

Page 16: ...t the biocide should be added after the unit is brought down for cleaning and during the refill process to insure proper mixing Following passivation if the tank water is corrosive in nature low hardn...

Page 17: ...protect the associated piping from freezing conditions Heat tracing and insulation should be installed on all piping connected to the unit to prevent cracking Protection Against Coil Freezing TSU Ice...

Page 18: ...ing an ice build cycle Ice created by subfreezing ambient temperatures which accumulates at the top of the tank and around the walls must be melted out before initiating a build cycle This ice can pre...

Page 19: ...ANK All ICE CHILLER Thermal Storage Units are provided with sectional insulated tank covers which when kept in place will minimize the accumulation of trash or debris in the tank However an ICE CHILLE...

Page 20: ...ly is designed to provide air to the ICE CHILLER Thermal Storage Unit for tank water agitation The air pump should run as a minimum during the first 3 hours of ice build to ensure a homogenous water t...

Page 21: ...vers to minimize dirt and debris accumulation within the tank Caution CLEAN THE AIR FILTER ONCE A MONTH DISINFECTION Disinfection of your cooling system may be needed in case of high concentration of...

Page 22: ...ining and after disinfection the system must be thoroughly flushed through with clean water A proper regularly monitored biocide programme reduces the need for cleaning and disinfection actions signif...

Page 23: ...Stay Should the unit s be stored outside prior to installation and or start up for approximately one month or longer or stored in severe climates it is imperative that certain actions be performed by...

Page 24: ...RENCE LITERATURE Eurovent 9 5 6 Recommended Code of Practice to keep your Cooling System efficient and safe Eurovent Cecomaf 2002 30p Guide des Bonnes Pratiques Legionella et Tours A ror frig rantes M...

Page 25: ...W W W B A L T I M O R E A I R C O I L E U...

Page 26: ...W W W B A L T I M O R E A I R C O I L E U...

Page 27: ...W W W B A L T I M O R E A I R C O I L E U...

Page 28: ...W W W B A L T I M O R E A I R C O I L E U...

Page 29: ...W W W B A L T I M O R E A I R C O I L E U...

Page 30: ...VE CONDENSERS HYBRID PRODUCTS PARTS SERVICES www BaltimoreAircoil eu info BaltimoreAircoil eu www balticare com info balticare com Please refer to our website for local contact details Industriepark Z...

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