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TROUBLE SHOOTING GUIDE FOR UNITS WITH DX COOLING

Complaint

Symptoms

Probable Cause

Recommended Action

Ref.

Note

1. Expansion valve
hisses.

Flash gas in liquid
line.

Add refrigerant.

2. Temperature
change in refrigerant
line through filter-
drier or solenoid stops
valve.

Clogged filter-drier
or solenoid stops
valve.

Replace filter core, clean valve.

Expansion valve
stuck or obstructed.

a. Repair or replace expansion
valve.

3. Short-cycling or
continuous running.

b. Improper
superheat
adjustment.

b. Check superheat and reset.

4. Superheat too high.

Excessive pressure
drops in evaporator.

Check superheat and reset
thermostatic expansion valve.

F. System short of capacity.

5. Short-cycling.

Reduced airflow.
a) Dirty coil.
b) Dirty air filters.
c) Faulty fan
drives.

Clean coil, filters and check fan
drive.

1. Excessively warm
water-leaving
condenser.

Too little or too
warm condenser
water.

Provide adequately cool water.
Lower setting of cooling tower
thermostat.

2. Excessively cool
water leaving
condenser.

Fouled tubes in
shell-and-tube
condenser.

Clean tubes.

a. Air or non-
compressible gas in
system.

a. Remove charges, evacuate and
recharge.

b. Overcharge of
refrigerant.

b. Remove excess or purge.

3. Exceptionally hot
condenser.

c. Coil of air-cooled
condenser
obstructed.

c. Remove obstruction.

G. Discharge pressure too

high.

4. Cooling tower (if
used) appears to be
operating
satisfactorily yet
excessive discharge
pressure exists.

Cooling tower too
small.

Recheck coiling tower rating
table for correct size selection.

Содержание VFB Series

Страница 1: ... AND MAINTENANCE INSTRUCTIONS BRY AIR INC 10793 ROUTE 37 WEST SUNBURY OHIO 43074 TEL 740 965 2974 FAX 740 965 5470 E MAIL BRYAIR1 AOL COM Bry Air Part Number 30864 August 09 1999 Copyright 1996 Bry Air Inc PROCESS INLET REACT INLET PROCESS OUTLET REACT OUTLET ...

Страница 2: ... 8 Steam reactivation controls 9 Airflow 9 Brysorb Plus Desiccant Media Rotation 9 Performance Testing 10 Thermometers 10 Dehumidifier Maintenance Instructions 11 Cabinet 11 Desiccant media 11 Seals 11 Drive motor 12 Filters 12 Fan Motor Maintenance Instructions 13 General maintenance 13 Fan bearing maintenance 14 Motor maintenance 14 V belt drive maintenance 15 Dehumidifier Service Instructions 1...

Страница 3: ...yinstalled operated and maintained This manual is provided to acquaint you with the dehumidifier so that installation operation and maintenance can proceed successfully Ultimate satisfaction depends on the quality of installation and a thoroughunderstandingofthisequipment TheVFBdehumidifierisbuiltaroundtestedengineeringprinciples and has passed a thorough inspection for quality of workmanship and ...

Страница 4: ...siccant preparing it for more moisture adsorption This process is done on a continuous basis providing a constant drying process The two air streams process and reactivation are separated by seals which contact the desiccant media Figure A illustrates the airflow relationship of the seals and airflow pattern TheVFBdehumidifierisdesignedwiththetwoairstreamsflowinginoppositedirections counterflow th...

Страница 5: ...ine drawing in this manual for minimum clearance space required on each side of the dehumidifier for maintenance and servicing Remove any external packaging or crating before connecting ductwork ELECTRICAL All local and state codes must be strictly adhered to and good electrical practices should be followed to achieve the best installation possible Power wiring to equipment must be adequately size...

Страница 6: ...e Unit Outline drawing for fan external static pressure CONDENSATE TRAPS Cooling Option A pipe nipple is installed on the drain pans of cooling coils for field installation of condensate traps All outside air coils and any others operating wet must be properly trapped for satisfactory operation Under some circumstances an after cooling coil may require trapping In these cases a trap with a swing t...

Страница 7: ...ions should be checked at this time if not previously done to insure they are rotating in the proper direction see below VERIFICATION OF PROPER FAN ROTATION Three Phase Apply power totheunitmomentarilybyplacingcontrolswitch CS inthe HANDorON positionfor two seconds and then back to the OFF position Verify that the fans are rotating in the right direction see direction arrow on fan If the fans are ...

Страница 8: ...until the heaters cut off then increase the setting until the heaters come on Compare the dial setting with the digital display on the auto reset hi limit to verify calibration A fan control VFB 3 ONLY is utilized to cool down the heaters when the dehumidifier is turned off CAUTION disconnecting main power defeats this device The reactivation fan may start any time there is residual heat Disconnec...

Страница 9: ...ch to the HAND or ON position 4 Reset the low gas pressure switch located near the gas train 5 Press the red reset button on the flame safety control inside the control enclosure The following will then take place A React fan motor will be energized B The combustion controller is energized and will program as follows 1 A short pre purge period 2 The ignition transformer is energized 3 The pilot va...

Страница 10: ...humidifier set upsheetorflowschematicincludedwiththismanual for the control scheme and proper reactivation temperature AIRFLOW The VFB dehumidifier uses two distinct air streams positively sealed from each other This eliminates the requirement to balance the air streams It is recommended that the pressure gauges supplied with the dryer be used to establish the proper air flows through the dehumidi...

Страница 11: ...fit tightly on the stem of the thermometer Distilled water cooled to 45 or 50 F if possible should be used to wet the sock In taking the wet bulb temperature the wet bulb thermometer should be placed in the air stream approximately 1000 FPM velocity and observed until the lowest stabilized temperature is obtained It is necessary to take two or more readings to verify the correct wet bulb THERMOMET...

Страница 12: ...ssed air and to reactivate the media at 350 F max for 15 minutes Washing the media is not recommended as wash water impurities may contaminate the desiccant Proper filtration and preventing contact with chemicals will greatly improve the life of the desiccant Inspect the face of the media to see that no surface damage has occurred If damage is noticed please contact Bry Air for assistance The medi...

Страница 13: ...maintenance interval for filters depends directly on the cleanliness of the air entering the dehumidifier It is suggested that a program be established to assure that the filters are replaced or cleaned prior to becoming clogged to the point they create a system problem The standard filters supplied are of a disposable non washable media Cleanable washable filters may be supplied in some cases In ...

Страница 14: ...in outlet or inlet ductwork 6 Bearings Bearings on high speed fans tend to run hot Therefore do not replace a bearing because it feels hot to the touch Place a pyrometer or contact thermometer against the pillow block and check the temperature Ball pillow blocks can have total running temperature of 165o F 74o C before the cause of overheating should be investigated 7 Fan wheels inspect wheel blad...

Страница 15: ...d these tags be missing the following will apply A Fractional Horsepower Sleeve Bearing Motors Under normal operation at ordinary temperatures and clean surroundings these motors will operate for three years without re lubrication Then lubricate annually with electric motor oil or SAE10oil Under continuous operation at higher temperatures but not to exceed 104 F ambient re lubricateannually B Frac...

Страница 16: ...pany V BELT DRIVE MAINTENANCE If belts squeal excessively at start up they are too loose and should be tightened Periodically check belt and sheave wear alignment and tension When belts show wear replace all belts at once with a new matched set of belts New belts will not work properly in conjunction with used belts due to difference in length Belts and sheaves should be clean and free from grease...

Страница 17: ...ove the tensioner bracket and motor from the front of the unit 6b To remove the tensioner bracket for the VFB 36 50 75 150 200 300 Follow these steps 1 Remove the 4 fasteners that hold the bracket to the motor 2 Remove the tensioner bracket from the front of the unit 6c To remove the motor for any VFB except the VFB 100 follow these steps 1 Disconnect the wiring to the drive motor 2 Remove the 4 f...

Страница 18: ...equire field fitting cutting to length 2 Slip perimeter seal over flange taking care not to stretch seal during installation Mark end and cut the seal longer than required to ensure proper fit of mating surfaces join under compression when seal installed 3 Cut a small notch in the perimeter seal as required to allow for proper installation at the points that the seal intersects the reactivation qu...

Страница 19: ...r opposite side Figure C Overlap Too loose Poor Fit Good Typ Profile of Divider Seal Seal Bond Joint With Silicone Rubber Sealant Mark 1 4 Seal Seal with teflon film Bry Air p n 30488 Divider Panel Seal Ass y Divider Section Seal Seal Ass y Perimeter Seal Divider Panel React Quadrant Partition ...

Страница 20: ...nical failure 5 Failures of fan drive mechanism Belts set screws keys etc 5 Repair or replace as req d 1 Excessive unconditioned make up air 1 Reduce make up air 2 Leaking ducts and or air handling equipment outside controlled space 2 Seal leaks 3 Access openings to space not sealed 3 Close and or seal Excessive infiltration of humid air into the controlled space 4 Space not vapor tight 4 Seal wit...

Страница 21: ...ck gas supply pressure adjust pressure regulator reset low gas pressure switch c Excessive gas pressure high gas pressure switch tripped c Adjust or replace pressure regulator reset high gas pressure switch d Faulty flame rod d Replace e Faulty ignition transformer e Replace f Faulty automatic control valve f Replace g Reactivation air flow g See inadequate air flow Inadequate or no reactivation h...

Страница 22: ...488 2 Ft 2 Ea Desiccant Media Seal Ring 30488 5 Ft 6 In 2 Ea Access Door Gasket Both 22285 29 Ft 1 Ea Heater Plate Gasket 25265 5 Ft 1 Ea Filter Door Gasket Both 22285 7 Ft 1 Ea Rtv Sealant 3oz Tube 30863 n a 1 Ea Notes 1 Call Bry Air Parts department for information price and delivery 2 Please provide serial number of machine when inquiring about replacement parts 3 See unit electrical bill of ma...

Страница 23: ...110 Process Gr lb In Process Temperature Out 85 F 75 F 65 F 55 F 45 F 700 FPM P R 284 F React Inlet 99 Gr lb Typical VFB Performance Curve 0 10 20 30 40 50 60 0 10 20 30 40 50 60 70 80 90 100 110 Process Gr lb In Process Gr lb Out 85 F 75 F 65 F 55 F 45 F 700 FPM P R 284 F React Inlet 99 Gr lb ...

Страница 24: ...7 028 HUMIDITY RATIO POUNDS OF MOISTURE PER POUND OF DRY AIR 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 1 5 2 5 2 4 6 8 R E L A T IV E H U M ID I T Y 10 R EL AT IV E H UM ID IT Y 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 2 5 3 0 30 3 5 35 4 0 40 4 5 45 5 0 50 5 5 55 6 0 60 6 5 65 7 0 70 7 5 75 8 0 80 8 5 W E T B U L B T E M P E R A T U R E F 85 9 0 12 5 13 0 13 5 VOLUME CU FT PER LB ...

Страница 25: ...006 007 HUMIDITY RATIO POUNDS OF MOISTURE PER POUND OF DRY AIR 5 10 15 20 25 30 35 40 45 50 1 5 2 5 2 4 6 8 R E LA T IV E H U M ID IT Y 10 RE LA TIV E HU MI DI TY 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 15 10 5 0 0 5 5 10 10 15 15 20 20 25 25 30 30 35 35 40 40 45 45 11 5 12 0 12 5 VOLUME CU FT PER LB DRY AIR 13 0 HUMIDITY RATIO GRAINS OF MOISTURE PER POUND OF DRY AIR W E T B U L B D E W P O I N T S A T U ...

Страница 26: ...Options Section ...

Страница 27: ...fail to function at set points determine cause and correct Jumping or bypassing any safety control other than for testing purposes is dangerous to personnel and equipment and nullifies the equipment warranty NOTE a qualified technician should perform Adjustments to the refrigeration equipment High pressure control connect a gauge to the compressor discharge service valve Stop condenser airflow by ...

Страница 28: ...sors oil level If low allow the compressor to operate continuously at full load for 3 to 4 hours checking the oil level at 30 minute intervals If level remains low add oil 2 Observe the oil pressure The oil pressure gauge reading should be approximately 20 to 35 PSI above the suction pressure gauge reading 3 Stop the compressor and check the shaft seal for excessive oil leakage If found check the ...

Страница 29: ...rainer screen ONCE A YEAR REPEAT ITEMS 1 THROUGH 12 13 Drain all circuits of the water condensing system Inspect the condenser piping and clean any scale or sludge from the tubes of the condenser 14 If a cooling tower or evaporative condenser is used flush the pumps and sump tank Remove any rust or corrosion from the metal surfaces and repaint 15 Inspect all motor and fan shaft bearings for signs ...

Страница 30: ...nser Allow the condenser to remain full of water during the off season A drained condenser shell is more likely to rust and corrode than one that is full of water A If the condenser will be subjected to freezing temperatures drain the water and refill with an antifreeze solution 5 Drain the cooling tower or evaporative condenser if used flush the sump and paint any rusted or corroded areas 6 Open ...

Страница 31: ...oved since the velocity in the evaporator is kept high by the hot gas BYPASS TO SUCTION LINE WITH LIQUID INJECTION VALVE With this method hot gas is bypassed directly into the suction line downstream of the main thermostatic expansion valve s bulb An auxiliary thermostatic expansion valve commonly called a de superheating thermostatic expansion valve or a liquid injection valve is required The pur...

Страница 32: ...d equipment a number of methods are used to maintain this minimum discharge pressure FAN CYCLING For applications where ambient temperatures are not extreme the condenser fan s is cycled on off in response to condenser pressure FAN SPEED CONTROL A fan speed control device activated by a temperature or pressure sensor controls the condenser fan motor speed in response to the saturated condensing te...

Страница 33: ...y 4 Full voltage at motor terminals but motor will not run Burned out motor Repair or replace 5 Inoperative motor starter Burned out holding coil or broken contacts Repair or replace 6 Compressor will not operate Frozen compressor due to locked or damaged mechanism Overhaul compressor 7 Resetting high pressure switch can restart system See complaint G See complaint G 8 Resetting oil failure protec...

Страница 34: ...3 Broken fan belt 4 Improper fan belt tension c Clean coil filters and check fan drive 3 Suction pressure too low frosting at filter drier Restricted liquid line filter drier Replace core 2 B Compressor Short Cycles 4 Compressor will not load or unload Cuts out on low pressure switch Inoperative compressor unloading system Repair or replace faulty control 1 Oil level too low Insufficient oil charg...

Страница 35: ...pressure or abnormally high suction pressure Leaky valves in compressor Overhaul compressor 4 D Compressor runs continuously 5 Compressor fully or partially unloaded but will not stop Solenoid stop valve leaks Repair valve 3 1 Compressor cuts out on oil failure protection control Lack of oil Add oil 2 Compressor knocks Internal parts of compressor broken Overhaul compressor a Liquid flood back a C...

Страница 36: ...ystem short of capacity 5 Short cycling Reduced airflow a Dirty coil b Dirty air filters c Faulty fan drives Clean coil filters and check fan drive 1 Excessively warm water leaving condenser Too little or too warm condenser water Provide adequately cool water Lower setting of cooling tower thermostat 2 Excessively cool water leaving condenser Fouled tubes in shell and tube condenser Clean tubes a ...

Страница 37: ... with condenser discharge air dampers or fan control H Discharge pressure too low 4 Suction pressure rises faster than 5psi per minute after compressor shutdown Leaky or broken compressor discharge valves Remove head examine valves and replace as necessary 1 Compressor runs continuously Excessive load on evaporator Check outdoor air dampers for excessive intake of high temperature ventilation air ...

Страница 38: ...ow 6 Compressor short cycles b Air cooled condenser operating with low temperature outdoor air b Consider controlling condensing temperature with condenser discharge air dampers or fan control Trouble Analysis Notes 1 Refrigerant Shortage The system must contain sufficient refrigerant charge to flood the sub cooling tubes of the condenser If the system is short of charge refrigerant gas enters the...

Страница 39: ...quid line solenoid valve 5 Superheat Adjustment If the thermostatic expansion valve is adjusted to produce too little superheat liquid refrigerant may pass from the evaporator into the suction line An abnormally cold suction line and possible liquid flood back to the compressor evidence this On the other hand too much superheat results in the feeding of too little refrigerant to the evaporator Thi...

Страница 40: ...h refrigerant to return the condensing pressure to normal 8 Improperly Sized Expansion Valve An oversized expansion valve will generally overfeed the evaporator at part load however at full load it will perform satisfactorily The reason being at part load the valve attempts to control at its superheat setting but its oversize port allows liquid to pass too rapidly This over feeds the evaporator ca...

Страница 41: ...25 deg F Desiccant Bed Timing Minutes Revolution 4m 12s Revolutions Hour 14 3 Design Conditions Process Side of Unit Process Air Inlet Dry Bulb Temperature before coil 75 deg F Process Air Inlet Grains Lb before coil 86 gr lb Dehumidifier Air Inlet Dry Bulb Temperature after coil 49 deg F Dehumidifier Air Inlet Grains Lb after coil 48 gr lb System Air Outlet Dry Bulb Temperature 94 deg F System Ai...

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