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Superheat and Suction Pressure

Trouble Shooting Guide

Low Suction Pressure and High Superheat

1. Moisture, dirt, wax

Undersized

valve*

3. High superheat adjustment

4. Gas charge condensation

5. Dead thermostatic element charge

6. Wrong thermostatic charge

7. Evaporator pressure drop - no external equalizer

8. External equalizer location

9. Restricted or capped external equalizer

10. Low refrigerant charge
11. Liquid line vapor

a. Vertical lift

b. High friction loss

c. Long or small line

d. Plugged drier or strainer

12. Low pressure drop across valve

a. Same as #11 above

b. Undersized distributor nozzle or circuits

c. Low condensing temperature

High Suction Pressure - Low Superheat

1. Oversized valve*

2. TEV seat leak

3. Low superheat adjustment

Bulb

installation

a. Poor thermal contact

b. Warm location

5. Wrong thermostatic charge

6. Bad compressor - low capacity

7. Moisture, dirt, wax

8. Incorrectly located external equalizer

Low Suction Pressure - Low Superheat

1. Low load

a. Not enough air

b. Dirty air fi lters

c. Coil icing

2. Poor air distribution

3. Poor refrigerant distribution

4. Improper compressor-evaporator balance

5. Evaporator oil logged

6. Flow from one TEV affecting another’s bulb

* Data Aire has ensured that valves are size properly as the unit ships from the factory.

Содержание MINI CEILING SERIES

Страница 1: ...MINI CEILING SERIES Installation Operation and Maintenance Manual 1 1 5 2 and 2 5 ton Air Water and Glycol Cooled DX and Chilled Water...

Страница 2: ...ce to Data Aire units should be done by qualified individuals with an adequate background in areas such as HVAC electrical plumbing and electronics as applicable Service performed by unauthorized or u...

Страница 3: ...2 Water Glycol Cooled Unit Piping 12 2 2 1 Connection Sizes Water Glycol Cooled Units 13 2 2 2 Connection Sizes Fluid Coolers 13 2 3 Auxiliary Chilled Water Coil Piping 13 2 4 Condensate Drain Piping...

Страница 4: ...s 22 5 3 Refrigerant Handling 22 5 4 Important Refrigeration Component 23 5 4 1 Expansion Valve 23 5 4 2 High Pressure Cutout Switch 23 5 4 3 Low Pressure Cutout Switch 23 6 0 GLYCOL SYSTEMS 24 6 1 Gl...

Страница 5: ...TY 29 10 0 CONTACT DATA AIRE 30 LINE SIZING CHART 31 Monthly Maintenance Inspection Checklist 32 Quarterly Maintenance Inspection Checklist 33 Superheat and Suction Pressure Troubleshooting Guide 34 T...

Страница 6: ...conditions and to prevent the CRAC units from running excessively to maintain the room s conditions 1 2 Inspection This Data Aire unit has been factory run tested and has gone through a comprehensive...

Страница 7: ...il Four threaded support rods must be securely attached to the building structure Raise the evaporator section with an appropriate lifting device Attach washers nuts and jam nuts to each threaded rod...

Страница 8: ...led condensing sections have no airflow connections Typical installations have the condenser or condensing section physically near the evaporator especially since most have shared electrical line powe...

Страница 9: ...s forming a weak acid and over time can cause pin hole leaks to develop in the coil tubes When equipment is installed after storage caution should be taken to inspect and replace if required rubber ho...

Страница 10: ...of refrigerant flow 1 2 for every ten feet of line length 2 1 2 Liquid Lines Liquid line size is determined by pressure drop and velocity The liquid line pressure drop should be not exceed 5 PSI The...

Страница 11: ...11 2 1 5 Field Piping Remote Condenser 2 1 6 Field Piping Remote Condensing Unit...

Страница 12: ...clearance problem Shutoff valves field provided should be installed within a few feet of the inlet and outlet connections of the CRAC unit to allow the unit to be isolated for service There should be...

Страница 13: ...have the 5 plenum below the evaporator drain pan with knockouts that allow field supplied and installed condensate lines to be routed out either side of the unit A union is recommended at the field co...

Страница 14: ...034kPa by using dry nitrogen with a trace of refrigerant Check the entire system for leaks with suitable leak finder per local code including but not limited to all braze joints caps and fittings and...

Страница 15: ...inimum Circuit Ampacity also known as Wire Sizing Amps will dictate the minimum required wire gage Maximum Overcurrent Protection Device amps will dictate the maximum circuit breaker or fuse size 3 3...

Страница 16: ...be field accessed on terminals 11 common and 12 normally closed or 13 normally open of terminal block TB1 This is a normally open or normally closed dry contact will reverse position upon alarm and i...

Страница 17: ...be unbolted from their collapsed shipping position and extended prior to placing the unit on its pad Each leg extends down approximately 18 and reattaches using the same bolts the bolts are placed th...

Страница 18: ...or Mounting a condenser or condensing unit more than ten feet below the evaporator is not recommended Excessive liquid line pressure drop can cause poor evaporator performance 4 6 Fluid Coolers Model...

Страница 19: ...charging should be done by referring to the unit electrical nameplate for the factory charge Although this figure represents the original factory charge it is still necessary to measure and note prope...

Страница 20: ...a compressor if the system has a refrigerant holding charge the crankcase heatershouldbeenergizedforaminimumof12hourstoreducethepossibilityofliquidslugging on start up Failure to energize the crankcas...

Страница 21: ...pressure drop low subcooling or low charge It is likely that more refrigerant will be required to complete the charging procedure Adjust the refrigerant charge until the sight glass clears or has onl...

Страница 22: ...head pressure sensing transducer is connected to a shrader fitting on the discharge line and water is regulated into the condenser coil Condenser coils may be plate fin or coaxial type Before startin...

Страница 23: ...g Any field adjustment should be to fine tune a system that has stabilized and already has acceptable operating parameters 5 4 2 High Pressure Cutout Switch Each refrigerant circuit is protected by a...

Страница 24: ...freeze protection 6 2 Internal Fluid Volume Evaporator Without With Internal Volume Energy Saver Coil Energy Saver Coil Model Volume Gallons Volume Gallons DAMG 0112 0 5 2 0 DAMG 1 512 0 5 2 0 DAMG 02...

Страница 25: ...ed to complete a thorough unit installation Start up is not complete until the Mini DAP II control panel settings are established 7 4 Optional Mini DAP III Microprocessor Control Panel The Mini DAP II...

Страница 26: ...dary heat exchanger The internal wiring of the heat exchanger is found on a separate diagram which can be found on the inside cover of the heat exchanger electrical box Both diagram types are also pla...

Страница 27: ...y to ensure proper tension If tightening is required loosen the four motor mounting bolts Turn the adjustment screw on the end of the motor mounting channel until the proper belt tension is attained R...

Страница 28: ...led refrigerant filter driers do not normally require maintenance When replacing compressors or other repairs that open the refrigeration system to atmosphere it is advisable to replace the filter dri...

Страница 29: ...uipment goods or merchandise arising out of any defect in or failure of any equipment of its manufacture and Buyer hereby waives any claim against Seller arising out of such claim This warranty shall...

Страница 30: ...e com Technical Support engineering dataaire com Engineering sales dataaire com Sales Web site www dataaire com Job Information Data Aire Job Number ________________________________________ Evaporator...

Страница 31: ...5 8 7 8 7 8 7 8 5 5 1 2 5 8 5 8 5 8 26 13 7 8 7 8 7 8 7 8 6 6 1 2 5 8 5 8 5 8 30 15 7 8 7 8 7 8 7 8 8 8 5 8 7 8 7 8 7 8 10 10 5 8 7 8 7 8 7 8 13 13 7 8 7 8 7 8 7 8 SUCTION LINES SINGLE CIRCUIT SYSTEMS...

Страница 32: ...mp operation ___ Auto air vent clean of mineral deposits Condensate Drain and Pump if applicable ___ Check for water leaks ___ Check for restricted air flow ___ Pump operation Steam Generating Humidif...

Страница 33: ...ng valve function ____ Check solution _____ ____ Check for water glycol leaks piping area ____ Water Glycol flow switch operational Glycol Pump s ____ Glycol leaks pump area ____ Pump operation ____ A...

Страница 34: ...across valve a Same as 11 above b Undersized distributor nozzle or circuits c Low condensing temperature High Suction Pressure Low Superheat 1 Oversized valve 2 TEV seat leak 3 Low superheat adjustmen...

Страница 35: ...0 8 73 8 49 82 4 R 22 R 407C Temperature Pressure PSI Pressure PSI 50 84 1 77 1 55 92 6 106 0 60 101 6 116 0 65 111 3 127 0 70 121 5 139 0 75 132 2 151 0 80 143 7 163 0 85 155 7 177 0 90 168 4 191 0 9...

Страница 36: ...eat Elements 28 High Pressure Cutout Switch 23 Horizontal Units 8 Humidifier Canister 27 A Air Cooled Systems 7 8 10 20 Air Filters 27 Air Vents 12 Ambient Thermostats 18 Auxiliary Wiring 15 B Bearing...

Страница 37: ...nued Dry Steam Humidifier Steam Generator Humidifier 14 I Inspection 6 Installation 6 Internal Volume see Volume L Liquid Lines 10 11 31 Leak Testing 14 Locating Evaporator 6 Secondary Heat Exchanger...

Страница 38: ..._____ _____________________________________________________________________________________________ _____________________________________________________________________________________________ ______...

Страница 39: ...3 www dataaire com e mail sales dataaire com A Member of the CS Group of Companies 2009 Data Aire Inc Data Aire Inc reserves the right to make design changes for the purpose of product improvement or...

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