FDNY Z51 Study Guide 2024-2025 Exam. All Verified Questions and Correct Detailed Answers., Exams of Refrigeration and Air Conditioning

Download FDNY Z51 Study Guide 2024-2025 Exam. All Verified Questions and Correct Detailed Answers. and more Exams Refrigeration and Air Conditioning in PDF only on Docsity!

[Date]

FDNY Z51 Study Guide 2024-2025 Exam. All

Verified Questions and Correct Detailed

Answers. Graded A

AB29 Certificate of Fitness Holder's Responsibility - ANSThe holder should inspect the battery system. AB29 Certificate of Fitness Holder's Responsibility - ANSThe holder should inspect the battery system. Acceptable Circumstances for Chaining and Exiting - ANSIt is never okay to chain and exit. Acceptable Circumstances for Chaining and Exiting - ANSIt is never okay to chain and exit. Action for Unsatisfied Building in Chilled Water System - ANSIf one building is not satisfied, put in an additional chilled water pump online. Action for Unsatisfied Building in Chilled Water System - ANSIf one building is not satisfied, put in an additional chilled water pump online. Advantage of Shell and Tube Condenser - ANSThe major advantage of a shell and tube condenser is that there is less danger of developing leaks.

[Date] Advantage of Shell and Tube Condenser - ANSThe major advantage of a shell and tube condenser is that there is less danger of developing leaks. ASHRAE Refrigerant Safety Classification - ANSThe most toxic ASHRAE refrigerant safety classification is b3, and the most flammable is a3. ASHRAE Refrigerant Safety Classification - ANSThe most toxic ASHRAE refrigerant safety classification is b3, and the most flammable is a3. Atmospheric Pressure Ratio Calculation - ANSIf the suction pressure is 3 psig and the discharge is 10 psi, with the atmospheric pressure at 14.7, the ratio closest to 1.39. Atmospheric Pressure Ratio Calculation - ANSIf the suction pressure is 3 psig and the discharge is 10 psi, with the atmospheric pressure at 14.7, the ratio closest to 1.39. Automatic Expansion Valve Function - ANSAn automatic expansion valve maintains a constant evaporator pressure. Automatic Expansion Valve Function - ANSAn automatic expansion valve maintains a constant evaporator pressure. BTU Removal in 30 Ton System - ANS360,000 BTUs are removed in a 30 ton system per hour. BTU Removal in 30 Ton System - ANS360,000 BTUs are removed in a 30 ton system per hour.

[Date] Cause of Condenser Pump Cavitation - ANSIf a refrigerant engineer verifies that a condenser pump is cavitated, the most likely cause for this condition is a faulty cooling tower water level controller. Cause of Condenser Pump Cavitation - ANSIf a refrigerant engineer verifies that a condenser pump is cavitated, the most likely cause for this condition is a faulty cooling tower water level controller. Centrifugal Chiller Start-up Procedure - ANSStart the chilled water pump, then start the condenser water pump, check oil, start cooling tower, and start compressor. Centrifugal Chiller Start-up Procedure - ANSStart the chilled water pump, then start the condenser water pump, check oil, start cooling tower, and start compressor. Centrifugal Compressor Capacity Control - ANSThe primary way of achieving capacity control of a centrifugal compressor is by adjustment to the inlet impeller pre-rotation vanes. Centrifugal Compressor Capacity Control - ANSThe primary way of achieving capacity control of a centrifugal compressor is by adjustment to the inlet impeller pre-rotation vanes. Charge in TEV Sensing Bulb - ANSThe charge in TEV sensing bulb is similar to the refrigerant in this system.

[Date] Charge in TEV Sensing Bulb - ANSThe charge in TEV sensing bulb is similar to the refrigerant in this system. Chemical Fire Extinguisher and System Requirement - ANSA chemical fire extinguisher and system are needed where water is not sufficient. Chemical Fire Extinguisher and System Requirement - ANSA chemical fire extinguisher and system are needed where water is not sufficient. Circuit Breaker Function - ANSA circuit breaker has a similar function as a fuse. Circuit Breaker Function - ANSA circuit breaker has a similar function as a fuse. Cooling Medium for Indirect Refrigeration System - ANSIn an indirect refrigeration system, glycol or any brine solution would not be used as a cooling medium for building spaces being cooled. Cooling Medium for Indirect Refrigeration System - ANSIn an indirect refrigeration system, glycol or any brine solution would not be used as a cooling medium for building spaces being cooled. Cooling Tower Cooling Medium - ANSThe cooling medium for a cooling tower is water Cooling Tower Cooling Medium - ANSThe cooling medium for a cooling tower is water

[Date] Cost Calculation for Operating a 5 Horsepower Motor - ANSThe equivalent energy consumption of a 5 horsepower motor operating for 9 hours is 33.6 kilowatt hours. Cost Calculation for Operating a 5 Horsepower Motor - ANSThe equivalent energy consumption of a 5 horsepower motor operating for 9 hours is 33.6 kilowatt hours. Device for Controlling Steam Turbine Speed - ANSThe device that automatically controls the speed of a steam turbine is the governor valve. Device for Controlling Steam Turbine Speed - ANSThe device that automatically controls the speed of a steam turbine is the governor valve. Duration for Keeping Fire Alarm Log Book - ANSA fire alarm log book must be kept for 3 years. Duration for Keeping Fire Alarm Log Book - ANSA fire alarm log book must be kept for 3 years. Effect of Clogged Air Louvers in Cooling Tower - ANSIf the air louvers below the fans in an induced draft cooling tower become clogged, the result would be higher return water temperature. Effect of Clogged Air Louvers in Cooling Tower - ANSIf the air louvers below the fans in an induced draft cooling tower become clogged, the result would be higher return water temperature.

[Date] Effect of Evaporator Shell Leak - ANSA leak in the evaporator shell may result in setting off the refrigerant monitor alarm for a chilled water system using refrigerant 134. Effect of Evaporator Shell Leak - ANSA leak in the evaporator shell may result in setting off the refrigerant monitor alarm for a chilled water system using refrigerant 134. Effect of Evaporator Shell Leak - ANSA leak in the evaporator shell may result in setting off the refrigerant monitor alarm for a chilled water system using refrigerant 134. Effect of Evaporator Shell Leak - ANSA leak in the evaporator shell may result in setting off the refrigerant monitor alarm for a chilled water system using refrigerant 134. Efficiency Improvement for Centrifugal Compressor - ANSA more efficient centrifugal compressor operation results from lowering the condenser pressure. Efficiency Improvement for Centrifugal Compressor - ANSA more efficient centrifugal compressor operation results from lowering the condenser pressure. Emergency Power Testing Frequency - ANSEmergency power testing must be done monthly. Emergency Power Testing Frequency - ANSEmergency power testing must be done monthly.

[Date] Engineer's Minimum Reading Log Requirement - ANSAn engineer needs to log readings once per shift. Engineer's Minimum Reading Log Requirement - ANSAn engineer needs to log readings once per shift. Engineer's Responsibility with Running Machine - ANSIf the machine is running, the engineer should not leave the building. Engineer's Responsibility with Running Machine - ANSIf the machine is running, the engineer should not leave the building. Filter Driers Function - ANSFilter driers remove moisture and particles. Filter Driers Function - ANSFilter driers remove moisture and particles. Fireproof Decorations Purpose - ANSFireproof decorations in buildings are used so they don't catch fire in an emergency. Fireproof Decorations Purpose - ANSFireproof decorations in buildings are used so they don't catch fire in an emergency. Flash Point of Compressor Lubricating Oil - ANSThe flash point of compressor lubricating oil should be higher than the compression temperature. Flash Point of Compressor Lubricating Oil - ANSThe flash point of compressor lubricating oil should be higher than the compression temperature.

[Date] Fully Primed Centrifugal Water Pump - ANSA centrifugal water pump is considered to be fully primed when the pump is full of liquid. Fully Primed Centrifugal Water Pump - ANSA centrifugal water pump is considered to be fully primed when the pump is full of liquid. Function of Atmospheric Pressure Ratio Calculation - ANSThe reading of the oil pressure gauge should read in a range closer to 15 to 30 PSI above suction pressure in relation to the suction pressure of a compressor. Function of Atmospheric Pressure Ratio Calculation - ANSThe reading of the oil pressure gauge should read in a range closer to 15 to 30 PSI above suction pressure in relation to the suction pressure of a compressor. Function of Equalizer Line on TXV - ANSThe equalizer line on TXV is used to compensate for the pressure drop across the evaporator coil. Function of Equalizer Line on TXV - ANSThe equalizer line on TXV is used to compensate for the pressure drop across the evaporator coil. Function of Equalizer Line on TXV - ANSThe equalizer line on TXV is used to compensate for the pressure drop across the evaporator coil. Function of Equalizer Line on TXV - ANSThe equalizer line on TXV is used to compensate for the pressure drop across the evaporator coil.

[Date] Function of Forced Draft Cooling Tower - ANSThe advantage of a forced draft cooling tower over a natural draft cooling tower is a smaller tower size. Function of Forced Draft Cooling Tower - ANSThe advantage of a forced draft cooling tower over a natural draft cooling tower is a smaller tower size. Function of Forced Draft Cooling Tower - ANSThe advantage of a forced draft cooling tower over a natural draft cooling tower is a smaller tower size. Function of Forced Draft Cooling Tower - ANSThe advantage of a forced draft cooling tower over a natural draft cooling tower is a smaller tower size. Function of High Side Float - ANSA high side float is used to maintain a constant level of refrigerant in the evaporator. Function of High Side Float - ANSA high side float is used to maintain a constant level of refrigerant in the evaporator. Function of High Side Float - ANSA high side float is used to maintain a constant level of refrigerant in the evaporator. Function of High Side Float - ANSA high side float is used to maintain a constant level of refrigerant in the evaporator. Function of Kingsbury Thrust Bearing in Steam Turbine - ANSThe Kingsbury thrust bearing maintains the axial position of the rotor shaft in a steam turbine.

[Date] Function of Kingsbury Thrust Bearing in Steam Turbine - ANSThe Kingsbury thrust bearing maintains the axial position of the rotor shaft in a steam turbine. Function of Middle Port on Gauge Manifold - ANSThe middle port on a gauge manifold will connect to the vacuum pump. Function of Middle Port on Gauge Manifold - ANSThe middle port on a gauge manifold will connect to the vacuum pump. Function of Middle Port on Gauge Manifold - ANSThe middle port on a gauge manifold will connect to the vacuum pump. Function of Middle Port on Gauge Manifold - ANSThe middle port on a gauge manifold will connect to the vacuum pump. Function of Refrigerant Engineer's Use of Psychrometer - ANSThe most common reason for a refrigeration engineer to use a psychrometer is to measure the relative humidity level of the atmosphere. Function of Refrigerant Engineer's Use of Psychrometer - ANSThe most common reason for a refrigeration engineer to use a psychrometer is to measure the relative humidity level of the atmosphere. Function of Refrigerant System Flow Operation - ANSUnder normal conditions, the refrigerant enters the compressor as a low pressure superheated vapor and leaves as a high pressure vapor.

[Date] Function of Refrigerant System Flow Operation - ANSUnder normal conditions, the refrigerant enters the compressor as a low pressure superheated vapor and leaves as a high pressure vapor. Function of Refrigeration Compressor - ANSThe function of the refrigeration compressor is to reduce wear and friction in the compressor parts. Function of Refrigeration Compressor - ANSThe function of the refrigeration compressor is to reduce wear and friction in the compressor parts. Function of Ruptured Disk for Low Pressure Centrifugal Refrigeration Machine - ANSThe ruptured disk for a low pressure centrifugal refrigeration machine is normally located on the compressor suction. Function of Ruptured Disk for Low Pressure Centrifugal Refrigeration Machine - ANSThe ruptured disk for a low pressure centrifugal refrigeration machine is normally located on the compressor suction. Function of Solenoid Valve in Reciprocating Refrigeration Machine - ANSA solenoid valve is used to allow a reciprocating refrigeration machine to adapt to the load on the system, and the opening of the solenoid valve is caused by electrical current creating a magnetic field. Function of Solenoid Valve in Reciprocating Refrigeration Machine - ANSA solenoid valve is used to allow a reciprocating refrigeration machine to adapt to the load on the system, and the opening of the solenoid valve is caused by electrical current creating a magnetic field.

[Date] Function of Solenoid Valve in Reciprocating Refrigeration Machine - ANSA solenoid valve is used to allow a reciprocating refrigeration machine to adapt to the load on the system, and the opening of the solenoid valve is caused by electrical current creating a magnetic field. Function of Solenoid Valve in Reciprocating Refrigeration Machine - ANSA solenoid valve is used to allow a reciprocating refrigeration machine to adapt to the load on the system, and the opening of the solenoid valve is caused by electrical current creating a magnetic field. Function of Suction and Discharge Valve in Reciprocating Compressor - ANSThe suction and discharge valve of the reciprocating compressor are mounted with the discharge valve on top of the valve plate and the suction valve below. Function of Suction and Discharge Valve in Reciprocating Compressor - ANSThe suction and discharge valve of the reciprocating compressor are mounted with the discharge valve on top of the valve plate and the suction valve below. Function of Suction and Discharge Valve in Reciprocating Compressor - ANSThe suction and discharge valve of the reciprocating compressor are mounted with the discharge valve on top of the valve plate and the suction valve below. Function of Suction and Discharge Valve in Reciprocating Compressor - ANSThe suction and discharge valve of the reciprocating compressor are mounted with the discharge valve on top of the valve plate and the suction valve below. Function of Vacuum Breaker in Steam Turbine - ANSThe function of the vacuum breaker in a steam turbine is to achieve a faster coast-down cycle.

[Date] Function of Vacuum Breaker in Steam Turbine - ANSThe function of the vacuum breaker in a steam turbine is to achieve a faster coast-down cycle. Function of Vacuum Breaker in Steam Turbine - ANSThe function of the vacuum breaker in a steam turbine is to achieve a faster coast-down cycle. Function of Vacuum Breaker in Steam Turbine - ANSThe function of the vacuum breaker in a steam turbine is to achieve a faster coast-down cycle. Function of Wear Rings in Centrifugal Pump - ANSThe purpose of wear rings in a centrifugal pump is to prevent wearing of the pump housing and impeller. Function of Wear Rings in Centrifugal Pump - ANSThe purpose of wear rings in a centrifugal pump is to prevent wearing of the pump housing and impeller. Gauge Reading for Chilled Water System - ANSA gauge reading of saturation pressure of refrigerant with chilled water as the cooling medium estimates the temperature of the chilled water being pumped to the spaces being cooled. Gauge Reading for Chilled Water System - ANSA gauge reading of saturation pressure of refrigerant with chilled water as the cooling medium estimates the temperature of the chilled water being pumped to the spaces being cooled. Heat Removal in Refrigerator Condenser - ANSThe heat removed from the refrigerator in the condenser is sensible and latent heat. Heat Removal in Refrigerator Condenser - ANSThe heat removed from the refrigerator in the condenser is sensible and latent heat.

[Date] Hot Work Near Sprinkler Head - ANSTo prevent the fire alarm system from going off, put a non-combustible barrier to protect the sprinkler. Hot Work Near Sprinkler Head - ANSTo prevent the fire alarm system from going off, put a non-combustible barrier to protect the sprinkler. House Cylinder Unloaders Function - ANSHouse cylinder unloaders work to keep the suction valve opened while the compressor is in the return stroke. House Cylinder Unloaders Function - ANSHouse cylinder unloaders work to keep the suction valve opened while the compressor is in the return stroke. Importance of Low Moisture in Steam Turbine - ANSIt is advisable to keep moisture in the inlet of a steam turbine as low as possible to keep turbine blades wear to a minimum. Importance of Low Moisture in Steam Turbine - ANSIt is advisable to keep moisture in the inlet of a steam turbine as low as possible to keep turbine blades wear to a minimum. Inspection of Sprinkler Heads - ANSAutomatic sprinkler heads need inspecting. Inspection of Sprinkler Heads - ANSAutomatic sprinkler heads need inspecting. Least Likely Refrigerant System to Leak - ANSAn indirect system is the least likely to leak refrigerant into the building space being cooled.

[Date] Least Likely Refrigerant System to Leak - ANSAn indirect system is the least likely to leak refrigerant into the building space being cooled. Measurement of Heat Transfer in BTU - ANSThe British thermal unit (BTU) is a measurement of heat or energy, and if 10 BTUs are transferred to 10 pounds of water, the water temperature increase will be closest to 1 ﾟ F. Measurement of Heat Transfer in BTU - ANSThe British thermal unit (BTU) is a measurement of heat or energy, and if 10 BTUs are transferred to 10 pounds of water, the water temperature increase will be closest to 1 ﾟ F. Measurement Unit for Electrical Current - ANSElectrical current is measured in amperage. Measurement Unit for Electrical Current - ANSElectrical current is measured in amperage. Operation of Expansion Valve - ANSWhen an expansion valve is operating properly, at the end of the evaporator will contain only superheated vapor. Operation of Expansion Valve - ANSWhen an expansion valve is operating properly, at the end of the evaporator will contain only superheated vapor. Phase 2 Firemen Service - ANSThe elevator operator is the only person that can control the elevator.

[Date] Phase 2 Firemen Service - ANSThe elevator operator is the only person that can control the elevator. Pressure Relief Out vs. Fusible Plugs - ANSA pressure relief out is better than fusible plugs to minimize refrigerant loss. Pressure Relief Out vs. Fusible Plugs - ANSA pressure relief out is better than fusible plugs to minimize refrigerant loss. Procedure After Recovering Liquid Refrigerant - ANSAfter recovering liquid refrigerant from a centrifugal chiller, the next step shall be to recover vapor. Procedure After Recovering Liquid Refrigerant - ANSAfter recovering liquid refrigerant from a centrifugal chiller, the next step shall be to recover vapor. Procedure for Putting Additional Pump Online - ANSTo put an additional pump online, open the suction valve and open the discharge valve gradually. Procedure for Putting Additional Pump Online - ANSTo put an additional pump online, open the suction valve and open the discharge valve gradually. PSIA Conversion from HG - ANSIf 29.92 HG = 14.7 PSIA, then 26" HG converts to 12.77 PSIA. PSIA Conversion from HG - ANSIf 29.92 HG = 14.7 PSIA, then 26" HG converts to 12.77 PSIA.

[Date] Purpose of Wear Rings in Centrifugal Pump - ANSThe purpose of wear rings in a centrifugal pump is to prevent wearing of the pump housing and impeller. Purpose of Wear Rings in Centrifugal Pump - ANSThe purpose of wear rings in a centrifugal pump is to prevent wearing of the pump housing and impeller. Reason for Using Psychrometer - ANSThe most common reason for a refrigeration engineer to use a psychrometer is to measure the relative humidity level of the atmosphere. Reason for Using Psychrometer - ANSThe most common reason for a refrigeration engineer to use a psychrometer is to measure the relative humidity level of the atmosphere. Refrigerant Cleaning System Installation - ANSThe installation of an inline refrigerant cleaning system is advisable to remove impurities from the system. Refrigerant Cleaning System Installation - ANSThe installation of an inline refrigerant cleaning system is advisable to remove impurities from the system. Refrigerant Escape Awareness - ANSIn the event of a refrigerant escape, the engineer should be aware of asphyxiation. Refrigerant Escape Awareness - ANSIn the event of a refrigerant escape, the engineer should be aware of asphyxiation. Refrigerant Extraction Process - ANSThe process by which refrigerant is extracted and cleaned for reuse without requirements for reclamation is called recycle.

[Date] Refrigerant Extraction Process - ANSThe process by which refrigerant is extracted and cleaned for reuse without requirements for reclamation is called recycle. Refrigerant Flow Determination in Economizer - ANSThe amount of refrigerant that flows through the orifices of an economizer is determined by the difference between the high side and low side pressure. Refrigerant Flow Determination in Economizer - ANSThe amount of refrigerant that flows through the orifices of an economizer is determined by the difference between the high side and low side pressure. Refrigerant Latent Heat Comparison - ANSOf the refrigerants in commercial and industrial use, the highest latent heat and refrigerant effect is ammonia. Refrigerant Latent Heat Comparison - ANSOf the refrigerants in commercial and industrial use, the highest latent heat and refrigerant effect is ammonia. Refrigerant Withdrawal for Major Repair - ANSWhen a refrigerator or unit is being taken out of service for major repair, the refrigerant engineer must ensure the containers for refrigerant withdrawal are approved by the US Department of Transportation. Refrigerant Withdrawal for Major Repair - ANSWhen a refrigerator or unit is being taken out of service for major repair, the refrigerant engineer must ensure the containers for refrigerant withdrawal are approved by the US Department of Transportation.

[Date] Refrigerant/Temperature Chart Conversion - ANSIf the chart indicates a Celsius temperature of 5 ﾟ, the equivalent in Fahrenheit is 41 ﾟ. Refrigerant/Temperature Chart Conversion - ANSIf the chart indicates a Celsius temperature of 5 ﾟ, the equivalent in Fahrenheit is 41 ﾟ. Refrigerants Inside Machine Gauges - ANSThe refrigerants found inside the machine gauges are the same type as the refrigerant inside the machine. Refrigerants Inside Machine Gauges - ANSThe refrigerants found inside the machine gauges are the same type as the refrigerant inside the machine. Refrigeration Compressor Failure Troubleshooting - ANSIf a refrigeration compressor has failed to turn on, the next item to be checked would likely be the temperature and pressure controls. Refrigeration Compressor Failure Troubleshooting - ANSIf a refrigeration compressor has failed to turn on, the next item to be checked would likely be the temperature and pressure controls. Requirement for Good Evaporator - ANSThe most important requirement for a good evaporator is that it must have enough cooling surface to absorb the required heat. Requirement for Good Evaporator - ANSThe most important requirement for a good evaporator is that it must have enough cooling surface to absorb the required heat.

[Date] Requirement for Good Evaporator - ANSThe most important requirement for a good evaporator is that it must have enough cooling surface to absorb the required heat. Requirement for Good Evaporator - ANSThe most important requirement for a good evaporator is that it must have enough cooling surface to absorb the required heat. Restriction Result in Reciprocating Compressor Efficiency - ANSA restriction in the refrigerant line would result in high suction superheat for a reciprocating compressor. Restriction Result in Reciprocating Compressor Efficiency - ANSA restriction in the refrigerant line would result in high suction superheat for a reciprocating compressor. Service Valve for Isolating Dual Pressure Relief Valve - ANSA 3-way valve should be installed to isolate dual pressure relief valve while keeping the system in service. Service Valve for Isolating Dual Pressure Relief Valve - ANSA 3-way valve should be installed to isolate dual pressure relief valve while keeping the system in service. Standpipe Out of Service Fire Watch Duration - ANSIf a standpipe system will be out of service for 2 days, there should be fire watch the entire time the standpipe is out of service. Standpipe Out of Service Fire Watch Duration - ANSIf a standpipe system will be out of service for 2 days, there should be fire watch the entire time the standpipe is out of service.

[Date] Steam Turbine Critical Speed - ANSWhen a steam turbine reaches critical speed, the turbine will vibrate violently. Steam Turbine Critical Speed - ANSWhen a steam turbine reaches critical speed, the turbine will vibrate violently. Steam Turbine Warm-up Time - ANSIt takes 10 to 15 minutes to warm up a steam turbine. Steam Turbine Warm-up Time - ANSIt takes 10 to 15 minutes to warm up a steam turbine. Suction Valve Usage in Semi-Hermetic Compressors - ANSIn most semi-hermetic compressors, the suction valve is used to cool the motor. Suction Valve Usage in Semi-Hermetic Compressors - ANSIn most semi-hermetic compressors, the suction valve is used to cool the motor. Thermostat Response to Sudden Temperature Drop - ANSIn a cold front with a sudden drop in temperature, the thermostat will cause the solenoid valve to close, pump the compressor down, and shut down on low pressure. Thermostat Response to Sudden Temperature Drop - ANSIn a cold front with a sudden drop in temperature, the thermostat will cause the solenoid valve to close, pump the compressor down, and shut down on low pressure.

[Date] Turbine Speed Measurement Device - ANSThe device used to measure the speed of a turbine is a tachometer. Turbine Speed Measurement Device - ANSThe device used to measure the speed of a turbine is a tachometer. Use of Ribbed Metal Piping for Electrical Wires - ANSRibbed metal piping is used for electrical wires connected to the refrigeration system to allow for flexibility and account for vibrations. Use of Ribbed Metal Piping for Electrical Wires - ANSRibbed metal piping is used for electrical wires connected to the refrigeration system to allow for flexibility and account for vibrations. Water Regulating Valves Usage - ANSWater regulating valves are used to maintain condenser pressure to a predetermined level. Water Regulating Valves Usage - ANSWater regulating valves are used to maintain condenser pressure to a predetermined level. Water Supply for Multi Zone Building - ANSEach zone in a multi-zone building will have its own automatic water supply. Water Supply for Multi Zone Building - ANSEach zone in a multi-zone building will have its own automatic water supply.