RMO EXAM Flashcards

Terms Definitions
LATENT HEAT OR MERTING
AMOUNT OF HEAT REQUIRED TO TURN A SOLID INTO A LIQUID
LATENT HEAT OR FUSION
THE AMOUNT OF HEAT THAT MUST BE REMOVED OF A LIQUID TO CHANGE IT INTO A SOLID AT ITS FREEZING POINT
LATENT HEAT
CHANGES THE STATE & THE SUBSTANCE, BUT NOT ITS TEMPATURE OR PRESSURE
SENSIBLE HEAT
IS A MEASURE OF THE INTERNAL HEAT & A SUBSTANCE - A CHANGE IN SENSIBLE HEAT RESULTS IN A CHANGE IN TEMPERATURE, BUT NOT IN THE STATE OF THE SUBSTANCE
WATER TREATMENT
FAILURE TO MAINTATIN WATER TREATMENT OF CONDENSER WATER CAN RESULT IN *HIGH HEAD PRESSURE*
FILLING A REFRIGERANT CYLINDER
CAN ONLY BE FILLED 75 PERCENT AS PER NYC (A 40 GALLON CAN BE FILLED WITH 30 GALLONS
DOES A SOLENOID VALVE VARY THE FLOW OF REFRIGERANT
A SOLENOID VALVE DOES NOT VARY THE FLOW OF REFRIGERANT
WHAT TABLETS SHOULD BE USED IN A BRINE SOLUTION TO PREVENT RUSTING?
WHEN USING A BRINE SOLUTION IN A SYSTEM USE D1-CHROMATE TABLETS TO PREVENT RUSTING
FROST ON SUCTION LINE
AND COMPRESSOR COULD BE CAUSED BY THE TEV BEING OPEN WIDE
GROUP 1 REFRIGERANTS
R-11/R-12 (REQUIRE OXYGEN DEPROVATION SENSORS) R-22 \ R-134A
COLOR OF RECOVERY CYLINDERS
GRAY WITH YELLOW TOPS
REFRIGERANT LEAK
THE OPERATOR SHOULD BE AWARE OF TOXICITY AND OXYGEN DEPROVATION CAPABILITIES OF THE REFRIGERANT
A SAFETY HEAD IS?
A VALVE PLATE BEING HELD DOWN WITH A SPRING
DIRECT SYSTEMS
ARE MOST LIKELY TO LEAK REFRIGERANT INTO BUILDING SPACES
WHAT RELEASES PRESSURE FROM THE TURBINE ON SHUTDOWN?
THE VACUM BREAKER
WHY IS A PRESSURE RELIEF VALVE BETTER THEN A RUSTIBLE PLUG?
A PRESSURE RELIEF VALVE IS BETTER THEN A FUSIBLE PLUG BECAUSE A FUSIBLE PLUG CANNOT RESEAT (FUSIBLE PLUG ONLY WORKS ON HEAT)
WHAT IS THE GOVERNOR USED FOR?
IT IS USED FOR AUTOMATIC SPEED CONTROL
WHAT IS THE PURPOSE OF GLAND STEAM?
TO CREATE POSITIVE PRESSURE AND ELIMINATE LEAKAGE
THE HEAT & EVAPORATION
THE HEAT THAT IS REJECTED OUT OF THE BUILDING AT THE COOLING TOWERS
OLDER TYPE OF CYLINDER UNLOADER
IS DESIGNED TO CONTROL (CYLINDER CLEARENCE POCKETS
HEATER COILS ON OUTDOOR COOLING TOWER
PREVENTS FREEZING
WHERE IS THE TEV SENSING BULB ATTACHED TO?
TEV SENSING BULB IS ATTACHED ON THE SUCTION LINE AT THE *END OF THE EVAPORATOR*
REFRIGERANT IN COMPRESSOR (STATE OF REFRIGERANT)
REFRIGERANT ENTERING THE COMPRESSOR IS *LOW PRESSURE VAPOR* LEAVES AS A *HIGH PRESSURE VAPOR*
GLYCOL VS BRINE
GLYCOL IS BETTER THAN BRINE BECAUSE IT *ELIMINATES CORROSION PROBLEMS *
COMPRESSOR SEAL MADE OF?
VAPOR STAYS IN THE COMPRESSOR W/ SEALS MADE OF *METAL*
GLOBE VALVE
AVOID USING GLOBE VALVE TO MINIMIZE PRESSURE DROP
CLEANING SHELL AND TUBE CONDENSERS
CAN BE MECHANICALLY CLEANED WITH BRUSHES
WHAT DOES A KINGSBURY THRUST BEARING PREVENT?
AXIAL MOVEMENT
HIGH SUPERHEAT
CAN BE CAUSED BY SCALE PARTICLES LOGGED IN A TEV
UNDESIRABLE PROPERTY IN REFRIGERANT
LOW LATENT HEAT
GROUP 2 REFRIGERANT
AMMONIA
CONDENSER WATER VALVES
CAN OPEN OR SHUTOFF CONDENSER WATER FLOW INTO OR OUT OF THE CONDENSER
PLUG VALVE
VALVE THAT CONTROLS THE FLOW OF WATER THROUGH THE CODENSER
SUCTION PRESSURE TRANSDUCER
SENDS A SUCTION PRESSURE SIGNAL TO THE CONTROL PANEL AND THE LOW PRESSURE CUTOUT
DISCHARGE PRESSURE TRANSDUCER
SENDS A DISCHARGE PRESSURE SIGNAL TO THE CONTROL PANEL AND THE HIGH PRESSURE CUTOUT
LIQUID LINE SIGHTGLASS
USED TO CHECK SYSTEM CHARGE AND IF MOISTURE IS IN SYSTEM
TEV (THERMAL EXPANSION VALVE)
METERING DEVICE THAT CONTROLS FLOW OF REFRIGERANT INTO THE EVAPORATOR
FILTER DRIER
USED TO REMOVE CONTAMINANTS AND MOISTURE FROM THE SYSTEM
LIQUID LINE SOLENOID VALVE
THIS VALVE WILL AUTOMATICALLY PUMPDOWN THE SYSTEM BY CLOSING OFF THE LIQUID LINE
WHAT HAS THE BEST REFRIGERANT EFFECT?
THE REFRIGERANT THAT HAS THE BEST REFRIGERANT EFFECT IS *AMMONIA*
WHAT WILL HAPPEN IF THE TEVS SENSING BULB FALLS OFF THE SUCTION LINE?
IF THE TEVS SENSING BULB FALLS OFF THE SUCTION LINE YOU WILL *FLOOD THE EVAPORATOR AND RAISE THE SUCTION PRESSURE*
WHAT WILL CAUSE THE MOST DAMAGE ON START-UP?
A FAULTY CHECK VALVE WILL CAUSE THE MOST DAMAGE ON START UP
WHAT IS THE PURPOSE OF HAVING 2 COMPRESSORS IN A CASCADE SYSTEM?
THE PURPOSE OF HAVING 2 COMPRESSORS IN A CASCADE SYSTEM IS TO OPERATE AT VERY LOW TEMPERATURES
WHAT CAN NON CONDENSABLES CAUSE?
NON CONDENSABLES CAN CAUSE HIGH HEAD PRESSURE
WHAT WOULD CAUSE A HALIDE TORCH FLAME TO TURN YELLOW?
IF A HALIDE TORCH FLAME TURNS YELLOW IT IS CAUSED BY A *CLOGGED SAMPLE TUBE*
WHAT CAN CAUSE HIGH CONDENSER HEAD PRESSURE
*A CLOGGED PUMP STRAINER* CAN CAUSE A LOSS OF PRESSURE CAUSING HIGH CONDENSER HEAD PRESSURE
LOW SIDE GAUGE
(SATURATION PRESSURE) CAN BE USED TO ESTIMATE CHILL WATER TEMPERATURE
ECONOMIZER
WHERE THE METERING DEVICE IS - CONTAINS ORIFICE PLATES.
CLOGGED ELIMINATOR FINS
:ON A COOLINGTOWER - COULD LEAD TO A HIGHER TEMPERATURE SUPPLY
CHARGE W/ VAPOR
SO YOU DONT FREEZE THE WATER IN THE TUBES (CENTRIFUGAL)
ISOLATE MACHINE WHILE KEEPING IN SERVICE
USE A THREE WAY VALVE (SERVICE VALVE)
CHARGE REFRIGERANT
-INTO THE LOW SIDE
DECREASE IN WET BULB TEMP
CAN LOWER THE TEMP OF COOLING TOWER WATER
A FAULTY WATER LEVEL CONTROL
CAN CAUSE THE PUMP TO CAVITATE
CAPACITORS
-DEVICES WHICH STORE ELECTRICITY AND ARE USED TO START MOTORS
LEAK TEST LOW PRESSURE
MAXIMUM PRESSURE TO LEAK TEST LOW PRESSURE CHILLERS IS 10PSIG
FLARE CONNECTIONS
-FLARE CONNECTIONS ARE NOT USED ON COPPER TUBING LARGER THAN 3/4 OF AN INCH -IT IS TOO HARD TO TIGHTEN SUFFICIENTLY TO MAKE A GAS TIGHT JOINT IN LARGER SIZES
REFRIGERANT W/ HIGHEST LATENT HEAT
AMMONIA
WHAT IS THE LEAVING WATER TEMPERATURE IN AN EFFICIENTLY OPERATING COOLING TOWER?
IN A INDUCED DRAFT COOLING TOWER THAT IS OPERATING EFFICIENTLY, THE LEAVING WATER TEMP IS AT SOME TEMPERATURE BETWEEN THE PREVAILING DRY AND WET BULB TEMP
WHAT MAY CAUSE THE EVAPORATOR TO NOT RESPOND TO ADJUSTMENTS OF THE TEV
IF THE EVAPORATOR DOESNT RESPOND TO ADJUSTMENTS OF THE TEV IT MAY BE DUE TO *OIL LOGGED ON THE LOW SIDE*
WHAT IS THE MAIN REASON FOR INSTALLING AN OIL SEPARATOR ON THE DISCHARGE LINE?
THE MAIN REASON FOR INSTALLING AN OIL SEPARATOR ON THE DISCHARGE LINE IS TO *RETURN OIL BACK TO THE COMPRESSOR CRANKCASE*
PSI OF LOW PRESSURE RUPTURE DISC
CHILLERS RUPTURE DISC IS SET AT 15PSI
LATENT HEAT OF CONDENSATION
THE AMOUNT OF HEAT THAT MUST BE REMOVED TO CHANGE A VAPOR BACK INTO A LIQUID
LATENT HEAT OF VAPORIZATION
THE AMOUNT OF HEAT THAT MUST BE ADDED TO A LIQUID AT ITS BOILING POINT TO CAHNGE IT INTO A VAPOR
PRESSURE RELIEF VALVE
VALVE USED TO RELIVE EXCESS FROM THE SYSTEM (TOP OF CONDENSER)
KING VALVE
SERVICE VALVE USED ON THE LIQUID LINE CAN BE USED TO MANUALLY PUMPDOWN THE SYSTEM BY CLOSING OFF THE LIQUID LINE (NORMAL OPERATING POSITION BACKSEATED)
SUCTION SERVICE VALVE
SERVICE VALVE USED ON THE INLET OF THE COMPRESSOR CAN BE USED TO CLOSE OFF THE SUCTION LINE (NORMAL OPERATING POSITION IS CRACKED OFF THE BACKSEAT)
DISCHARGE SERVICE VALVE
SERVICE VALVE USED ON THE OUTLET OF COMPRESSOR CAN BE USED TO CLOSE OFF THE DISCHARGE LINE. (NORMAL OPERATING POSITION IS CRACKED OF THE BACKSEAT)
COPPER AND ALUMINUM TUBES
YOU WOULD USE THESE B/C OF THEIR THERMAL CHARACTERISTICS FOR TRANSFERRING HEAT
BELOW THE COMPRESSORS VALVE PLATE
LOW PRESSURE VAPOR IS FOUND BELOW THE COMPRESSORS VALVE PLATE
ABOVE COMPRESSOR VALVE PLATE
WHERE HIGH PRESSURE VAPOR IS FOUND
SHOULD NOT USE FUSIBLE PLUG
IN A SYSTEM THAT DOES NOT HAVE ANY HEAT
ELECTRIC SHOCK
IF A HOT WIRE IS TOUCHING THE INSIDE OFA MOTOR CASING A RMO COULD GET AN ELECTRIC SHOCK
MAGNETIC COIL OF SOLENOID VALVE
WHEN COIL ENERGIZED IT WILL LIFT A PLUNGER OFF THE SEAT
PURGE UNIT W/ COMPRESSOR
WHEN A PURGE UNIT IS RUNNING THE COMPRESSOR MUST ALSO BE RUNNING
TEV
DROPS REFRIGERANT FROMA HIGH PRESSURE LIQUID TO A LOW PRESSURE LIQUID. IT ALSO *MAINTAINS A CONSTANT SUPERHEAT IN THE EVAPORATOR
ADVANTAGES OF AN AEV (AUTOMATIC EXPANSION VALVE)
-MAINTAINS A CONSTANT EVAP PRESSURE -SIMPLE DESIGN -LITTLE COULD GO WRONG - EXCESSIVE CHARGE WILL HAVE NO EFFECT
HIGH SUPERHEAT IN SUCTION LINE
THIS COULD INDICATE YOU ARE LOW ON REFRIGERANT
AUTOMATIC WATER REGULATING VALVES
AUTOMATIC WATER REGULATING VALVES VARY WATER FLOW ACCORDING TO *CONDENSER HEAD PRESSURE*
COMPRESSOR FAILS
AND YOU ALREADY CHECKED THE ELECTRIC CIRCUIT MOTOR, SWITCHES,AND BREAKERS THE PROBLEM COULD BE A FAULTY PRESSURE TEMP CONTROL
LOW PRESSURE CONTROL
CYCLES THE COMPRESSORS ON AND OFF
RELATIVE HUMIDITY
THE RATIO OF ACTUAL WATER VAPOR IN THE ATMOSPHERE TO THE SATURATION PRESSURE
WHAT IS THE PURPOSE OF STEAM EJECTORS
TO CREATE A VACCUM FOR THE STEAM EXHAUST
POWER CONSUMPTION FORMULA
WATTS =VOLTS X AMPS X POWER FACTOR
THE LOW SIDE FLOAT
CENTRIFUGAL - CONTROLS THE FLOW OF REFRIGERANT INTO THE EVAPORATOR
WATER REGULATING VALVES WORK OFF
WATER REGULATING VALVES WORK OFF OF *CONDENSER HEAD PRESSURE*
IN A RECIPROCATING COMPRESSOR, AND USING THE SPLASH SYSTEM FOR LUBRICATION,WHAT CAUSES THE FOAMING OF OIL?
THE FOAMING OF OIL IS CAUSED BY A *SUDDEN DECREASE IN PRESSURE*
WHAT IS A SOLENOID VALVE PART OF?
A SOLENOID VALVE IS PART OF PUMP DOWN CYCLE THERMOSTAT- SOLENOID VALVE AND LOW PRESSURE CONTROL
REQUIRED AUTOMATIC PURGE UNIT
:AUTOMATIC PURGE UNIT - IS REQUIRED FOR SYSTEMS THAT OPERATE BELOW ATMOSPHERIC PRESSURE (IN A VACUUM)
WHEN 2 LOW SIDES FLOATS ARE IN PARALLEL,EACH FLOAT VALVE WILL?
ONLY PASS REFRIGERANT FOR ITS OWN EVAPORATOR
IN THE ABSENCE OF WATER CHEMICAL TREATMENT, THE COOLING TOWER SHOULD?
BE DRAINED REGULARY EVERY WEEK OR TWO AND REPLACED W/ CLEAN FRESH WATER
WHAT ARE TWO CONCEPTS IN WHICH A REFRIGERATION SYSTEM HAS A CHANGE IN TEMP BUT PRESSURE REMAINS THE SAME?
SUPERHEAT AND SUBCOOLING
WHAT IS THE TEMP IN WHICH RELATIVS HUMIDITY IS 100%
DEW POINT
DISADVANTAGE OF THE SUCTION LINE FILTER DRIER COMPARED TO THE LIQUID LINE DRIER
A CLOGGED SUCTION LINE FILTER DRIER WILL REDUCE THE CAPACITY OF THE COMPRESSOR
CONDENSER CONTAIMENENTS
AIR, NITROGEN, AND OTHER NON-CONDENSABLES COLLECTINTHE CONDENSER
HOW SHOULD A RECIP MACHINE W/OUT UNLOADERS BE STARTED?
THE SUCTION LINE VALVE AND DISCHARGE BYPASS BOTH OPEN
WHAT SAFETY GROUP DOES AMMONIA BELONG 2?
GROUP 2. B2
WHAT COLOR WOULD THE POWER HEAD VALVE HAVE IF IT WAS CHARGED W/ R-22?
GREEN
WHEN CHARGING A SYSTEM W/ LIQUID REFRIGERANT W/ A SET OF MANIFOLD, WHAT POSITION ARE THE VALVES ON THE MANIFOLD?
HIGH SIDE BACKSEATED, LOW SIDE FRONTSEATED
ASHARE SAFETY GROUP THAT IS MOST DANGEROUS
B3- HIGH FLAMABILITY & TOXICITY
SEMI-HERMETIC COMPRESSORS VS. HERMETIC COMPRESSORS
HERMETIC ARE FULLY ENCLOSED AND CANNOT BE SERVICED ON SITE
UNLOADERS ARE USED TO?
REDUCE CAPACITY
IF YOU ARE USING A PORTABLE COMPRESSOR RECOVERY UNIT TO REMOVE VAPOR, WHAT WOULD HAPPEN WHEN YOU ARE RECOVERING?
VAPOR DENSITY IS DECREASED
IF AN ELECTRIC MOTOR IS RATED WITH 3HP IT WILL?
USE A 3 PHASE
WHAT IS THE PURPOSE FOR THE EQUALIZER LINE?
TO MAKE UP FOR THE PRESSURE DROP IN EVAPORATOR
DUE TO COLD FRONT, THERE WAS A SHARP DROP IN OUTSIDE TEMP, THE MOST LIKELY EFFECT OF THIS CONDITION ON THE OPERATION OF THE RECIP MACHINE WOULD BE THAT THE THERMOSTAT CAUSES SOLENOID VALVE TO?
CLOSE, THE COMPRESSOR PUMPS DOWN AND SHUTS DOWN ON LOW PRESSURE
THE PRESSURE A CENTRIF COMPRESSOR CAN DEVELOP DEPENDS ON THE?
TOP SPEED OF THE IMPELLER WHEEL.
WHEN IS A CENTRIFUGAL WATER PUMP CONSIDERED A LIFT PUMP?
WHEN THE SUCTION INLET OF THE WATER SOURCE IS BELOW PUMP LEVEL
IF 10 BTUS IS TRANSFERRED TO 10 LBS OF WATER, THE INCREASE IN TEMP IS CLOSEST TO?
1 DEG F
SUCTION PRESSURE EFFECT
SUCTION PRESSURE *INCREASES* THE REFRIGERANT EFFECT PER TON *DECREASES*
MULTIMETER
CAN MEASURE VOLTAGE RESISTANCE AND AMPERAGE
WHAT IS TIP SPEED BASED ON?
THE DIAMETER OF THE IMPELLER WHEEL AND ITS REVOLUTIONS PER MINUTE
WHEN IS A CENTRIF PUMP FULLY PRIMED?
WHEN IT IS FULL OF LIQUID AND ALL AIR HAS BEEN REMOVED
WHAT CAN CAUSE A PROBLEM WHEN USING A HALIDE TORCH ON A ROOF?
A STRONG WIND
WHAT KIND OF CHARGE WOULD STARVE THE EVAPORATOR
A LOW REFRIGERANT CHARGE
THE AMOUNT OF VENTILATION FOR REFRIGERANT REMOVAL PURPOSES ARE DETERMINED BY?
THE LARGEST SYSTEM IN THE MACHINERY ROOM
THE MOST IMPORTANT COOLING MEDIUM FOR A ROOF TOP UNIT IS?
AIR
WHY ARENT HALIDE TORCHES USED OUTDOORS?
B/C YOU WILL NOT BE ABLE TO DETECT THE CHANGE IN COLOR ON A BRIGHT DAY
THE TURBINE AUXILIARY OIL PUMP IS USED TO?
SUPPLY OIL TO THE BEARINGS AT START-UP
MAJOR ADVANTAGE OF A MULTI-STAGE CENTRIF COMPRESSOR IS?
THEY CAN BE OPERATED AT A LOWER SPEED THEN A SINGLE STAGE
WHAT HAPPENS WHEN WATER IS MIXED W/ REFRIGERANT?
SLUDGE AND ACIDS CAN FORM
LOW CONDENSING PRESSURE IS NOT GOOD BECAUSE
EXPANSION VALVES WILL NOT FEED PROPERLY
A GAUGE THAT READS THE SATURATION PRESSURE OF A REFRIGERANT,IF CHILLED WATER IS BEING CIRCULATED AS THE COOLING MEDIUM, THIS READING CAN BEST BE USED TO ESTIMATE THE?
TEMPERATURE OF THE CHILLED WATER BEING PUMPED TO THE BUILDING SPACES THAT ARE BEING COOLED
AN OPERATOR IS USING A PORTABLE RECOVERY VESSEL AND COMPRESSOR TO RECOVER VAPOR REFRIGERANT FROM A MACHINE. THE RECOVERY PROCESS WILL SLOW DOWN B/C?
THE REFRIGERANT PRESSURE WILL DECREASE
CHILL WATER TEMPERATURE GAUGES
MEASURES THE TEMPERATURE OF CHILL WATER ENTERING OR LEAVING THE EVAPORATOR
CHILL WATER VALVES
CAN OPEN OR SHUT CHILL WATER FLOW INTO OR OUT OF THE EVAPORATOR
UNLOADERS
CONTROL CAPACITY (TOP OF COMPRESSOR)
OIL SERVICE VALVE
ADDS OR REMOVES OIL FROM THE COMPRESSOR
OIL TEMPERATURE SENSOR
MEASURES TEMPERATURE OF THE COMPRESSOR OIL
OIL HEATER
HEATS THE COMPRESSOR OIL (WHEN COMPRESSOR IS OFF)
OIL PRESSURE TRANSDUCER
SENDS AN OIL PRESSURE SIGNAL TO THE CONTROL PANEL AND THE OIL PRESSURE CUTOUT. (MEASURE OIL PRESSURE)
OIL SIGHTGLASS
USED TO CHECK THE COMPRESSOR OIL LEVEL
OIL PUMP COVER PLATE
PLATE THAT COVERS THE COMPRESSOR OIL PUMP
CHILL WATER PRESSURE GAUGES
MEASURES PRESSURE OF CHILL WATER ENTERING OR LEAVING THE EVAPORATOR
SHORT CYCLING OF LOW SIDE FLOAT
IF A UNIT USING A LOW SIDE FLOAT WAS SHORT CYCLING IT COULD *NEED ADDITIONAL REFRIGERANT*
2 PRESSURES OF AEV
AEV WORKS ON 2 PRESSURES 1. EVAPORATOR PRESSURE IS CLOSING PRESSURE 2. SPRING PRESSURE IS THE OPENING PRESSURE
OVER CHARGE THE SYSTEM
IF YOU OVER CHARGE THE SYSTEM YOU WILL RUN W/ HIGH HEAD PRESSURE
5LB PRESSURE DROP IN EVAP
IF THERE IS A 5LB PRESSURE DROPIN THE EVAP THE EXTERNAL EQUALIZER LINE WILL SUPPLY A CLOSING PRESSURE TO THE TEV FROM THE SAME POINT THE TEMP OF THE SENSING BULB TAKEN
DURING THE WINTER AIR COOLED CONDENSERS CAN BE CONTROLLED BY?
-CYCLING FANS -VARIABLE SPEED MOTORS -DAMPER CONTROL
THE WATER REGULATING VALVE OPENS OR CLOSES AUTOMATICALLY IN RESPONSE TO?
CONDENSING PRESSURE AND MAINTAINS THE SET OR DESIRED CONDENSING PRESSURE
WHAT DOES NOT DESCRIBE A CENTRIFUGAL PUMP?
A POSITIVE DISPLACEMENT PUMP. IT IS NOT POSITIVE DISPLACEMENT
JET EJECTOR
IF RESTRICTED WILL HAVE INSUFFICIENT HEAD, TO LIFT THE OIL (BACK TO OIL SUMP)
WHAT SHOULD YOU DO WHEN TESTING A 3 PHASE CIRCUIT USING A CLAMP AMMETER
CHECK EACH PHASE INDIVIDUALLY
COOLING TOWERS REQUIRE?
CHEMICALS TO REDUCE THE FORMATION OF SCALE AND ALGAE
BUTANE
YOU NEED FIRE DEPT. APPROVAL TO USE BUTANE
THE CYLINDER UNLOADER IS DESIGNED TO?
THE CYLINDER UNLOADER ON A RECIPROCATING COMPRESSOR IS DESIGNED TO -CONTROL CYLINDER CLEARANCE POCKETS
WHAT IS A FILTER DRIER USED FOR?
A FILTER DRIER IS USED TO REMOVE *MOISTURE & DEBRIS*
WHERE IS THE OIL SEPARATOR LOCATED?
OIL SEPARATOR IS LOCATED ON *THE DISCHARGE LINE AS FAR FROM THE COMPRESSOR AS POSSIBLE*
HOW MANY BELTS DOES A MOTOR HAVE?
A MOTOR HAS 4 BELTS, IF ONE IS WORN YOU *CHANGE ALL THE BELTS*
WHAT RESULTS IN A SUDDEN REDUCTION IN THE SUPPLY OF COOLING WATER?
A SUDDEN REDUCTION IN THE SUPPLY OF COOLING WATER COULD RESULT IN AN (INCREASE IN HEAD PRESSURE)
CYLINDER UNLOADERS
ARE USED FOR CONTROLLING CAPACITY
WHERE DO YOU CHARGE VAPOR?
YOU CHARGE VAPOR INTO THE SUCTION SIDE OF THE COMPRESSOR
R-22
IS ODORLESS
DUMPING REFRIGERANT
IN A EMERGENCY YOU CAN DUMP REFRIGERANT UNDER FDNY SUPERVISION
WHAT IS THE GIMPEL VALVE USED FOR?
AN OVERSPEED TRIP IN THE EVENT THE RPMS REACH OVER THE MAXIMUM SPEED
HOW DOES A RECIPROCATING MACHINE CYCLE MULTISTAGE COMPRESSORS?
A RECIPROCATING MACHINE CYCLES MULTISTAGE COMPRESSORS ON AND OFF WITH *LOW PRESSURE CONTROL*
WARM WATER W/ R-12
DO NOT EXCEED A WATER TEMP OF 90 DEG
STATE OF REFRIGERANT IN CONDENSER?
ENTERS AS A HIGH PRESSURE GAS/ LEAVES AS A HIGH PRESSURE LIQUID
ELECTRIC RESISTANCE HEATERS
:RESISTOR CIRCUIT -ARE USED TO DEFROST EVAPORATORS
HYDROSTATIC TUBE TEST
-DETECTS A WATER TUBE LEAK IN A LOW PRESSURE CHILLER
R-123
OXYGEN DEPLETING -CLASS 2 SUBSTANCE
CENTRIFUGAL CHILLER PURGE UNIT
1. TAKES A COMBINATION OF AIR AND REFRIGERANT FROM TOP OF CONDENSER 2. REMOVES AIR AND NON CONDENSABLES 3. RETURNS LIQUID REFRIGERANT BACK TO CONDENSER
HORSEPOWER WILL INCREASE WHILE?
HORSEPOWER WILL INCREASE AS THE HEAD PRESSURE INCREASES
HORSEPOWER WILL DECREASE WHILE?
HORSEPOWER DECREASES AS SUCTION PRESSURE INCREASES
WHAT WILL STARVE THE EVAPORATOR?
IF YOU USE AN AUTOMATIC EXPANSION VALVE WITH A VARIABLE LOAD YOU WILL STARVE THE EVAPORATOR
WHAT DOES AN AUTOMATIC EXPANSION VALVE DO?
MAINTAINS A CONSTANT EVAPORATOR PRESSURE
REMOVING VALVE PLATES
WHEN YOU REMOVE VALVE PLATES YOU SHOULD REPLACE *VALVES AND SEATS*
WHAT DOES OIL FOAMING IN THE COMPRESSOR RESULT IN?
OIL FOAMING IN THE COMPRESSOR IS A RESULT OF *LIQUID REFRIGERANT IN THE CRANKCASE
VARIABLE INLET GUIDE VANES
CONTROLS COMPRESSOR ON CENTRIFUGAL COMPRESSOR
HOW DO RECIPROCATING COMPRESSORS UNLOADERS WORK?
RECIPROCATING COMPRESSOR UNLOADERS WORK BY KEEPING COMPRESSOR SUCTION VALVES OPEN
LOCATION OF COMPRESSION VALVES
LOCATED ON BOTH SIDES OF THE VALVE PLATE -DISCHARGE ON TOP/ SUCTION BELOW
WHEN A COMPRESSOR IS SAID TO HAVE A SAFETY HEAD THIS MEANS?
COMPRESSOR HAS PRESSURE RELIEF DEVICE
INLINE REFRIGERANT CLEANING SYSTEMS
- IS ADVISABLE B/C REFRIGERANT REACTS WITH LUBE OIL
LOW CONDENSING PRESSURE
IS NOT GOOD B/C EXPANSION VALVES WILL NOT FEED PROPERLY
REMOVING THE EXTERNAL EQUALIZER
WOULD STARVE THE EVAPORATOR
EVAPORATOR CHARGING VALVE
WHERE REFRIGERANT IS ADDED TO LOW PRESSURE CENTRIFUGAL CHILLER
STOP VALVES ON RECIPROCATING COMPRESSOR
STOP VALVES ON THE INLET (SUCTION SIDE) AND THE OUTLET (DISCHARGE SIDE)
VARIABLE SPEED MOTORS
CAN CONTROL CAPACITY ON CENTRIFUGAL COMPRESSORS
FAULTY COMPRESSOR VALVES WILL CAUSE?
1.EXCESSIVE CYCLING 2.CRANKCASE TEMP TO BE HIGH 3.DISCHARGE LOW 4.SUCTION HIGH CAUSED BY FAULTY COMPRESSOR VALVES
REPAIR W/ NITROGEN
UNDER EPA REGULATIONS YOU CAN PRESSURIZE A SYSTEM FOR A *NON MAJOR REPAIR W/ NITROGEN
REPLACEMENT OF EVAPORATOR COIL
-UNDER EPA REGULATIONS REPLACEMENT OF A EVAPORATOR COIL IS ALWAYS CONSIDERED A *MAJOR REPAIR*
BOILING R-11
R-11 AT 14.7 PSIA (0PSIG) WILL BOIL AT 74.5 DEG
ELECTRIC MOTOR RESISTORS (CUT BY ONE HALF)
AN ELECTRIC MOTOR IF THE RESISTORS ARE CUT BY ONE HALF AND ALL OTHER FACTORS BEING EQUAL THE POWER IS *INCREASED BY A FACTOR OF 2*
SIZING OF SOLENOID VALVE
SIZED ACCORDING TO REFRIGERANT (TONNAGE) AND A (PRESSURE DROP) THROUGH TO VALVE THAT IS ACCEPTABLE
DISADVANTAGES OF AEV
1. DOES NOT RESPOND WELL TO VARYING LOADS 2. DOES NOT WORK WELL W/MORE THAN ONE EVAPORATOR IN A SYSTEM
OIL PRESSURE COMPARED TO SUCTION PRESSURE
OIL PRESSURE SHOULD BE AT LEAST15-30 POUNDS ABOVE THE SUCTION PRESSURE IN A RECIPROCATING COMPRESSOR
WHAT CONTROLS THE FLOW OF REFRIGERANT INTO THE EVAPORATOR?
TEV MODULATES AND CONTROLS THE FLOW OF REFRIGERANT INTO THE EVAPORATOR
CHILL WATER BRINES
CALCIUM CHLORIDE AND GLYCOL ARE USED AS CHILL WATER BRINES IN AN INDIRECT SYSTEM (R-22 IS NOT A BRINE)
WHAT IS THE MAXIMUM PERCENTAGE OF LUBRICANT THAT SHOULD BE CIRCULATED?
IN A WELL DESIGNED SYSTEM THE PERCENT OF LUBRICANT CIRCULATED SHOULD NOT EXCEED 10%
2 PUMPS IN PARALLEL
WHEN YOU RUN 2 PUMPS IN PARALLEL, YOU INCREASE TOTAL FLOW RATE (GPM) -PRESSURE IS THE SAME WHEN RUNNING 1 OR 2 PUMPS
PRESSURE RELIEF VALVES
START FUNCTIONING AT DESIGN PRESSURE
GAUGES ON THE HIGH SIDE
SHOULD BE GRADUATED TO AT LEAST 12 TIMES THE DESIGN PRESSURE
WHAT DOES OIL IN A REFRIGERANT SYSTEM REDUCE?
OIL IN A REFRIGERANT SYSTEM REDUCES *WEAR AND FRICTION*
WHAT IS PROPER MACHINE START UP?
CHECK OIL, START CHILL WATER PUMP, CONDENSER WATER PUMP, TOWER FANS, START MACHINE
WHAT REFRIGERANT SYSTEMS ARE MOST LIKELY TO LEAK REFRIGERANT IN BUILDING SPACES THAT ARE BEING COOLED?
DIRECT SYSTEMS
WHAT WOULD HAPPEN IF THE TEVS SPRING WAS TO BREAK
IF THE TEVS SPRING WAS TO BREAK IT WOULD *FLOOD THE EVAPORATOR AND RAISE SUCTION PRESSURE*
WHAT CAUSES A COMPRESSOR TO KNOCK?
A COMPRESSOR KNOCKING COULD BE CAUSED BY *REFRIGERANT SLUGGING IN THE COMPRESSOR*
WHAT HAPPENS WHEN AUTOMATIC EXPANSION VALVES WORK WITH EVAPORATOR PRESSURE?
THE EVAPORATOR PRESSURE CLOSES THE VALVE SPRING. PRESSURE OPENS VALVE
UNDER WHAT CONDITIONS OF THE HEAT IN BTU/MIN ABSORBED BY THE CONDENSER WATER IN A REFRIGERATING PLANT IS GREATER?
-LOW EVAPORATIVE TEMPERATURE AND LOW CONDENSER TEMPERATURE
A MORE EFFICIENT OPERATION OF A CENTRIFUGAL COMPRESSOR RESULTS FROM?
LOWER THE CONDENSER PRESSURE
WHEN PROPERLY PURGING YOU SHOULD?
STOP WHEN PRESSURE CEASES TO DROP
A RMO NEEDED TOVARY THE FLOW OF REFRIGERANT IN A SYSTEM, A CONTINUOUS VARIATION IN THE FLOW OF THE SYSTEM DOES NOT INCLUDE?
THE SOLENOID VALVE
A COLDER WATER SUPLY IS TO BE PRODUCED, IN ORDER TO ACCOMPLISH THIS YOU SHOULD,
LOWER THE COMPRESSOR SUCTION / OPERATING PRESSURE
A RUPTURE DISC IN A CENTRIFUGAL MACHINE IS LOCATED?
ON THE EVAPORATOR
THE ASHRA REFRIGERANT W/RESPECT TO FIRE SAFETY, THAT IS MOST DANGEROUS IS?
A3
IF DURING THE DAY THE TEMP REMAINS CONSTANT, AND THE WET BULB DROPS BY 5DEG, AND ALL OTHER CONDITIONS REMAIN UNCHANGED, THE OPERATOR SHOULD SEE?
LOWER COOLING WATER TEMP RETURN
COPPER PIPING ON REFRIG
COPPER PIPING IS USED IN REFRIG B/C IT IS A GOOD CONDUCTOR
MOST SUPERHEAT
OCCURS AFTER WHEN BOILING IS COMPLETE
SILVER SOLDER
USED TO CONNECT 2 PIPES TOGETHER WHEN BRAZING
SUPERHEAT
IS VAPOR ABOVE ITS BOILING POINT
COMPRESSOR STUFFING BOX
PREVENTS THE LEAKING OF REFRIGERANT VAPOR
CLEANING SHELL AND COIL CONDENSERS
MUST BE CLEANED CHEMICALLY
THE CYLINDER UNLOADER CONTROLS CAPACITY, IS THERE ANY OTHER FUNCTION IT MAY HAVE?
IT ASSISTS WITH COMPRESSOR START UP
IN A 3 STAGE CENTRIFUGAL CHILLER WHAT HAPPENS TO THE PRESSURE ASIT REACHES THE FINAL STAGE?
PRESSURE INCREASES
IF YOU WERE RUNNING 3 COMPRESSORS WHAT DESCRIBES THE STATE OF REFRIGERANT LEAVING THE 3RD EVAPORATOR COIL?
SUPERHEATED VAPOR
REMOVING THE INSULATION ON THE SUCTION LINE,WITH THE ENGINE TEMP@ 85 DEG, WHAT WILL OCCUR?
FLOODED EVAPORATOR
CONCERNING LEAKAGE, GLOBE VALVES CAUSE?
MORE LEAKAGE
MACHINE ROOM STANDARDS
HAVE BEEN ESTABLISHED BY ASHARE 15
FILTER DRIER IN SUCTION LINE
RESTRICTION CAUSED BY A FILTER DRIER IN THE SUCTION LINE CAN CAUSE *MORE REDUCTION IN CAPACITY THAN A FILTER DRIER IN THE LIQUID LINE
OPTIONS BESIDE CITY WATER
WATER FROM WELLS, RIVERS, LAKES OR THE OCEAN MAY BE USED IN COOLING TOWERS
PRV DISCHARGE POINT
THE DISCHARGE POINT MUST BE 15FT ABOVE THE GROUND AND MUST BE 20FT OR MORE FROM ANY WINDOW VENT, OPENING, OR BUILDING EXIT
DISAMANTLING AND SALVAGING LOW PRESSURE APPLIANCE
REFRIGERANT MUST BE RECOVERED
CHILL WATER PUMPS ARE ALWAYS?
INSULATED
OIL TRAPS OR OIL SEPERATORS
RETURN OIL BACK TO THE COMPRESSOR CRANK CASE
COMPOUND GAUGES
MEASURE POSITIVE PRESSURE AND NEGATIVE PRESSURE (VACCUM)
FLEXIBLE COUPLING
CONNECTS MOTOR TO THE PUMP
FAULTY COMPRESSOR VALVES
IF YOU PUMP DOWN A COMPRESSOR TO 25HG THEN STOP THE COMPRESSOR,IF THE PRESSURE THEN INCREASES YOU COULD HAVE A FAULTY COMPRESSOR VALVE
AMMETER
USE IF A MOTOR GOES OFF ON OVERLOAD. ALLOWS YOU TO CHECK AMPERAGE
MELTING POINT OF FUSIBLE PLUG
MELTING POINT IS MARKED ON IT
WHAT DESSICANTS ARE FREQUENTLY USED IN FILTER DRIERS ?
ACTIVATED ALUMINA, SILICA GEL, AND DRIERITE
WHAT IS USED TO REMOVE MOISTURE IN FILTER DRIERS?
DESSICANT
THE MEASURE OF POWER GOING TO A SOLENOID VALVE IS?
WATTS
WHAT HAPPENS TO THE STEAM AS IT GOES THROUGH EACH STAGE OF TURBINE?
DROPS IN PRESSURE
WHAT CLOSES OFF THE MAIN STEAM?
MAIN STEAM VALVE
WHAT IS THE MAXIMUM AMOUNT OF REFRIGERANT THAT CAN BE STORED?
330 LBS
WHY IS IT IMPORTANT TO ELIMINATE MOISTURE FROM ENTERING THE INLET OF A STEAM TURBINE?
IT COULD DAMAGE THE TURBINE BLADES
WHAT HAPPENS WHEN A STEAM TURBINE REACHES CRITICAL SPEED?
TURBINE WILL VIBRATE VIOLENTLY
WHAT RELEASES PRESSURE FROM THE TURBINE ON SHUTDOWN?
VACCUM BREAKER
WHAT TYPE OF SHAFT BEARINGS DO TURBINES USE?
SLEEVE BEARINGS
WHAT IS THE PURPOSE OF STEAL EJECTORS?
TO CREATE A VACCUM FOR THE STEAM EXHAUST
WHAT WOULD CAUSE AN ATMOSPHERIC VALVE TO OPEN AND VENT STEAM PRESSURE?
-DIRTY TUBES -LOW WATER FLOW -HOLE IN TUBES
WHAT IS AN AUXILIARY OIL PUMP USED FOR?
START UP AND SHUT DOWN
HOW LONG DOES IT TAKE TO WARM UP A STEAM TURBINE?
10-15 MINUTES
HOW DO YOU KEEP PROPER WATER LEVEL IN THE HOTWELL?
WITH OVERBOARD VALVE AND RECIRCULATION VALVE
STEAM JETS ON SURFACE CONDENSER
TO CREATE PROPER EXAUST VACCUM
TACHOMETER
USED TO TRACK THE SPEED OF A STEAM TURBINE
TEV CHARGE
CHARGE - REFRIGERANT INSIDE THE TEVS SENSING BULB -4TYPES OF CHARGES 1. LIQUID CHARGE BULB 2. CROSS LIQUID CHARGE 3. VAPOR CHARGE BULB 4. CROSS VAPOR CHARGE BULB
STEPS TO NOT FREEZE WATER COILS OF CHILLER
-CHARGE AS VAPOR -CIRCULATE WATER -*DO NOT* CHARGE LIQUID UNTIL SATURATION TEMP IS ABOVE 32 DEG
HOW MUCH REFRIGERANT CAN BE STORED ON SITE?
20 PERCENT
WHAT IS THE PRESSURE OF R-22 AT 41DEGF?
70PSIG
R-22 SYSTEMS HEAD PRESSURE
THE HEAD PRESSURE WITH A CONDENSER WATER SUPPLY TEMPERATURE OF 85 DEG IS 200-215PSI
CONCERNING LEAKAGE, GATE VALVE CAUSES?
GATE VALVE LESS LEAKAGE
A FUSIBLE PLUG MELTS AT?
280F?
WHEN WILL THE BTUS ABSORBED BY THE CONDENSING WATER BE THE GREATEST?
WHEN THERE IS HIGH CONDENSER TEMP AND LOW CONDENSING WATER TEMP
FLOODED EVAPORATORS HAVE HIGH HEAT TRANSFER PER SQUARE FOOT, WHAT MAY BE A DISADVANTAGE?
REQUIRES A LARGE CHARGE
SHELL AND TUBE CONDENSERS HAVE THE ADVANTAGE OF? (NOT CLEANING)
REMOVING HEADS FOR CLEANING THE WATER SIDES OF THE TUBES AND THE REFRIGERANT CONNECTIONS DOES NOT HAVE TO BE DISRUPTED
THE MOST CORRECT WAY TO DESCRIBE A BRAZED JOINT IT?
A GAS TIGHT FITTING
WEARING RINGS
-PREVENT DISCHARGE WATER FROM LEAKING BACK INTO THE SUCTION EYE OF THE IMPELLER. -LEAKAGE COULD CAUSE DAMAGE TO THE IMPELLER AND PUMP CASING
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