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Cooling Warranty Information | nVent HOFFMAN
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Instruction Manual for nvent models including: CR29 Air Conditioner, CR29, Air Conditioner, Conditioner
ProAir Harsh Environment Indoor/Outdoor 4X CR29, 4000BTU 230V, Brushed, SS304 | nVent HOFFMAN
ProAir Harsh Environment Indoor CR29, 4000BTU 115V, Lt Gray, Steel | nVent HOFFMAN
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DocumentDocumentPROAIR Air Conditioner CR29 Model We connect and protect Rev. M P/N 89104461 89104461 TABLE OF CONTENTS Warranty and Return Policy......................................................................................................................................................................... 2 General Safety Instructions ........................................................................................................................................................................ 3 Receiving The Air Conditioner..................................................................................................................................................................... 3 Handling And Testing The Air Conditioner................................................................................................................................................... 3 Installation Instructions.............................................................................................................................................................................. 4 Dimension Drawings................................................................................................................................................................................... 4 Mounting Cutout Dimension ....................................................................................................................................................................... 5 Wire Diagrams And Schematics .................................................................................................................................................................. 6 Wire Diagram, Level 1, 2000 BTU ......................................................................................................................................................................... 6 Schematic, Level 1, 2000 BTU.............................................................................................................................................................................. 6 Wire Diagram, 115 V, Level 1, 4000 BTU ................................................................................................................................................................7 Schematic, 115 V, Level 1, 4000 BTU.....................................................................................................................................................................7 Wire Diagram, 230 V, Level 1, 4000 BTU.............................................................................................................................................................. 8 Schematic, 230 V, Level 1, 4000 BTU................................................................................................................................................................... 8 Wire Diagram, Level II and III, 2000 BTU ............................................................................................................................................................. 9 Schematic, Level II and III, 2000 BTU .................................................................................................................................................................10 Wire Diagram, 115 V, Level II and III, 4000 BTU ..................................................................................................................................................10 Schematic, 115 V, Level II and III, 4000 BTU ....................................................................................................................................................... 11 Wire Diagram, 230 V, Level II and III, 4000 BTU ................................................................................................................................................. 11 Schematic, 460 V Level I, 4000 BTU...................................................................................................................................................................12 Schematic, 460 V Level II and III, 4000 BTU ......................................................................................................................................................12 Components List .......................................................................................................................................................................................13 Parts List...................................................................................................................................................................................................14 Technical Information................................................................................................................................................................................15 Design Data..........................................................................................................................................................................................................15 System Controls ........................................................................................................................................................................................15 Level I Temperature Controller............................................................................................................................................................................15 Level II and III Temperature Controller ...............................................................................................................................................................15 Temperature Control..................................................................................................................................................................................16 Principles of Operation ..............................................................................................................................................................................16 Compressor .........................................................................................................................................................................................................16 Inlet Air Filter........................................................................................................................................................................................................16 How to Remove, Clean or Install A New Inlet Air Filter......................................................................................................................................16 Condenser and Evaporator Air Movers ..............................................................................................................................................................17 Refrigerant Loss ........................................................................................................................................................................................ 17 Preventative Maintenance/Inspection........................................................................................................................................................18 Trouble Shooting .......................................................................................................................................................................................19 F-GAS Information.....................................................................................................................................................................................23 NOTE: Some of the information in this manual may not apply if a special unit was ordered. If additional drawings for a special unit are necessary, they have been inserted. Contact Pentair Equipment Protection if further information is required. WARRANTY AND RETURN POLICY https://hoffman.nVent.com/en-us/cooling-warranty-registration https://nVent.widen.net/s/s8xgmxhvk2/89153291 2 | nVent.com/HOFFMAN GENERAL SAFETY INSTRUCTIONS Observe the following general safety instructions for installation and operation of this product: · This appliance is for installation only in locations not accessible to the general public. · This appliance is not intended for use by persons, including children, with reduced physical, sensory, or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning the use of the appliance by a person responsible for their safety. · Children should be supervised to ensure that they do not play with the appliance. · This appliance should be installed in accordance with national wiring regulations. · Follow all precautions detailed in the following sections during transportation, receiving, testing, operation and maintenance. · This appliance is intended for altitudes up to 10,000 ft (3,048 m) from sea level. For every additional 1000 ft of elevation, the capacity of this unit is derated by 1%. RECEIVING THE AIR CONDITIONER Inspect the air conditioner. Check for concealed damage that may have occurred during shipment. Look for dents, scratches, loose assemblies, evidence of oil, etc. Damage evident upon receipt should be noted on the freight bill. Damage should be brought to the attention of the delivering carrier NOT to nVent Equipment Protection within 15 days of delivery. Save the carton and packing material and request an inspection. Then file a claim with the delivering carrier. nVent Equipment Protection cannot accept responsibility for freight damages; however, we will assist you in any way possible. HANDLING AND TESTING THE AIR CONDITIONER If the air conditioner has been in a horizontal position, be certain it is placed in an upright, vertical or mounting position for a minimum of five (5) minutes before operating. CAUTION: Do not attempt to operate the air conditioner while it is horizontal or on its side, back or front. The refrigeration compressor is filled with lubricating oil. This will cause permanent damage to the air conditioner and also voids the warranty. TEST FOR FUNCTIONALITY BEFORE MOUNTING THE AIR CONDITIONER TO THE ENCLOSURE. Refer to the nameplate for proper electrical current requirements. If cord-connected, connect the power cord to a properly grounded power supply. If permanently connected, wire the unit to a properly grounded power supply using copper conductors only. Power supply wiring should be restrained to ensure no contact with the internal fan. Minimum circuit ampacity should be at least 125% of the amperage shown in the design data section for the appropriate model. No other equipment should be connected to this circuit to prevent overloading. The air conditioner is rated for operation at 50 and 60 Hz. No action is necessary to adjust the appliance operation at the rated frequencies. Immediately after applying power, the evaporator blower (enclosure air) should start running. Operate the air conditioner for five (5) to ten (10) minutes. No excessive noise or vibration should be evident during this run period. The condenser blower (ambient air), the evaporator blower (enclosure air), and the compressor should be running. Condenser air temperatures should be warmer than normal room temperatures within a few minutes. The compressor is provided with automatic reset thermal overload protection. This thermo-switch is located and mounted inside the plastic enclosure clipped to the compressor. The switch operates when the compressor overheats due to clogged or dirty inlet air filter or if ambient air temperatures exceed nameplate rating or if enclosure dissipated heat loads exceed the rated capacity of the air conditioner. The thermal overload switch will actuate and stop compressor operation. The blowers will continue to operate and the compressor will restart after it has cooled to within the thermal overload cut-in temperature setting. nVent.com/HOFFMAN | 3 INSTALLATION INSTRUCTIONS 1. Inspect air conditioner and verify functionality before mounting the air conditioner, see HANDLING AND TESTING THE AIR CONDITIONER on page 3. 2. Using the cutout dimensions shown in this manual, prepare the air "IN" and air "OUT" openings, and mounting bolt hole pattern for the enclosure. Select an installation location that will allow for adequate ventilation and clearance for service. Clearance between the air conditioner with or without a supplementary heater and adjacent structures (another enclosure, air conditioner, wall, or combustible surface) must be at least: · 24 from front · 6 from right side · 2 from left side · 6 from top; allow 20 above filter for filter removal · 14 from bottom Local fire codes may have different requirements; please observe applicable regulations for the location of the air conditioner. The distance between the air conditioner and the electronic components and other equipment installed inside the enclosure must be at least 3 to ensure adequate air circulation. At minimum clearance levels, an air baffle between the inlet and outlet may be necessary to prevent recirculation. 3. Using the mounting gasket kit provided with the unit, install gasket to air conditioner. 4. Mount air conditioner on enclosure using mounting bolts and washers provided to secure unit to enclosure. Allow unit to remain upright for a minimum of five (5) minutes before starting. Caution! Air conditioner must be in upright position during operation. 5. To avoid cross-threading mounting inserts, start bolts by hand before tightening with a wrench or ratchet driver. 6. Refer to the top of the nameplate for electrical requirements. Connect the power cord or wire the unit to a properly grounded power supply by following applicable national wiring regulations. Use of an extension cord is not recommended. If the air conditioner is wired to the power supply, the electrical circuit should be fused with a time delay fuse or HACR circuit breaker per the MOPD rating in the Design Data table see page 15. 7. When the unit is equipped with an automatic temperature controller, the controller is preset at the factory for your convenience and should not require adjustment. DIMENSION DRAWINGS NOTE: 1. MOUNTING GASKET SUPPLIED (NOT SHOWN) 2. UNITS: in. [mm] CLEANABLE, REUSABLE ALUMINUM INLET FILTER 9.26 235 8.63 219 11.22 285 1.69 (3X) 43 ENCLOSURE AIR IN 1.06 27 29.50 749 AMBIENT AIR IN 23.10 587 15.75 400 13.66 347 8.05 204 .40 10 5.04 128 9.56 243 (2X) 25.06 637 (2X) COOL AIR OUT AMBIENT 13.00 AIR OUT 1/4-20 UNC (6X) 330 .56 (2X) 89045048 REV E 14 4 | nVent.com/HOFFMAN MOUNTING CUTOUT DIMENSION 1.06 27 .74 19 6.40 163 29.50 749 12.00 305 .40 10 .50 13 (6X) 24.12 613 .75 19 15.75 400 14.06 (3X) 357 12.50 318 .40 10 1.06 27 9.56 243 (2X) 25.06 637 (2X) 1.06 27 (2X) 4.75 121 AC OUTLINE NOTE: Mounting Gasket Adheres to Air Conditioner nVent.com/HOFFMAN | 5 WIRE DIAGRAMS AND SCHEMATICS WIRE DIAGRAM, LEVEL 1, 2000 BTU 50/60 HZ SCHEMATIC, LEVEL 1, 2000 BTU 89111534 REV D 6 | nVent.com/HOFFMAN 7975710 REV B WIRE DIAGRAM, 115 V, LEVEL 1, 4000 BTU WIRING DIAGRAM 89100701 REV.C SCHEMATIC, 115 V, LEVEL 1, 4000 BTU 7*;' NOTE: For voltage, hertz, and options not shown in this manual, refer to the wiring diagram attached to the unit. nVent.com/HOFFMAN | 7 WIRE DIAGRAM, 230 V, LEVEL 1, 4000 BTU 89111007 REV D SCHEMATIC, 230 V, LEVEL 1, 4000 BTU NOTE: For voltage, hertz, and options not shown in this manual, refer to the wiring diagram attached to the unit. 8 | nVent.com/HOFFMAN WIRE DIAGRAM 89111553 REV.C WIRE DIAGRAM, LEVEL II AND III, 2000 BTU nVent.com/HOFFMAN | 9 SCHEMATIC, LEVEL II AND III, 2000 BTU WIRE DIAGRAM, 115 V, LEVEL II AND III, 4000 BTU 10 | nVent.com/HOFFMAN 89100766 REV C 89100766 REV C SCHEMATIC, 115 V, LEVEL II AND III, 4000 BTU 4.25 WIRE DIAGRAM, 230 V, LEVEL II AND III, 4000 BTU 5.00 8 PART NO. S MATERIAL N FINISH TOLERANCE ONE PLACE ( TWO PLACE THREE PLACE ANGLES PROPRIETARY AND CONFIDENTIAL THE INFORMATION CONTAINED IN THIS DRAWING IS THE SOLE PROPERTY OF HOFFMAN ENCLOSURES. ANY REPRODUCTION IN PART OR AS A WHOLE WITHOUT THE WRITTEN PERMISSION OF HOFFMAN ENCLOSURES IS PROHIBITED. SolidW TH PR NOTE: For voltage, hertz, and options not shown in this manual, refer to the wiring diagram attached to the unit. nVent.com/HOFFMAN | 11 5.00 SCHEMATIC, 460 V LEVEL I, 4000 BTU 3.50 50/60 HZ WIRE DIAGRAM 89111009 REV E 5.00 SCHEMATIC, 460 V LEVEL II AND III, 4000 BTU 3.50 PART NO. 89111009 NA MATERIAL SEE NOTES FINISH NONE PROPRIETARY AND CONFIDENTIAL THE INFORMATION CONTAINED IN THIS DRAWING IS THE SOLE PROPERTY OF HOFFMAN ENCLOSURES INC. ANY REPRODUCTION IN PART OR AS A WHOLE WITHOUT THE WRITTEN PERMISSION OF HOFFMAN ENCLOSURES INC. IS PROHIBITED. UNLESS OTHERWISE SPECIFIED DIMENSIONS AND TOLERANCES IN INCH S D TOLERANCES: ONE PLACE DECIMAL .1 C TWO PLACE DECIMAL .03 THREE PLACE DECIMAL .015 A HOLE DIA ANGLES .005 2 D THIRD ANGLE D PROJECTION 50/60 HZ WIRE DIAGRAM 89111018 REV E 12 | nVent.com/HOFFMAN NOTE: 1. M PART NO. 89111018 NA MATERIAL SEE NOTES FINISH NONE UNLESS OTHERWISE SPECIFIED DIMENSIONS AND TOLERANCES IN INCH TOLERANCES: ONE PLACE DECIMAL .1 SCALE DRAWN CHECKED NONE EDG --- COMPONENTS LIST Part Description Blower, Condenser CR290216GXXX 115 Volt 50/60 Hz 3000 BTU 29412110SP Blower, Evaporator 29412110SP Capacitor, Compressor, Start 89111993SP Compressor 89108747SP Thermal Overload, Compressor 89111994SP Thermostat, SPST, 55-100F 10106116SP Relay, Compressor, Start 89111992SP Power Cord Consult factory Capacitor, Compressor, Run N/A Part Description Blower, Condenser CR290416GXXX 115 Volt 50/60 HZ 4000 BTU 29412110SP Blower, Evaporator 29412110SP Capacitor, Compressor, Start 89115350SP Compressor 89100365SP Thermal Overload, Compressor 89115348SP Thermostat, SPST, 55-100F 10106116SP Relay, Compressor, Start 89115349SP Power Cord Consult factory Capacitor, Compressor, Run N/A CR290226GXXX 230 Volt 50/60 Hz 2700 BTU 29412010SP 29412110SP 89117017SP 89108748SP 89111997SP 10106116SP 89111995SP Consult factory N/A CR290426GXXX 230 Volt 50/60 HZ 4000 BTU 29412010SP 29412110SP 89104096SP 89104088SP 89112198SP 10106116SP 89104095SP Consult factory 89104097SP CR290246GXXX 460 Volt 50/60 Hz 2700 BTU 29412010SP 29412010SP 89117017SP 89108748SP 89111997SP 10106116SP 89111995SP Consult factory N/A CR290446GXXX 460 Volt 50/60 HZ 4000 BTU 29412010SP 29412010SP 89104096SP 89104088SP 89112198SP 10106116SP 89104095SP Consult factory 89104097SP nVent.com/HOFFMAN | 13 1 2 3 11 4 12 5 13 6 7 10 9 8 PARTS LIST Part Description 1 Condenser Coil 2 Filter, drier, refrigerant 3 Compressor 4 Hot Gas bypass valve (CR2904xx units only) 5 Evaporator coil 6 Inlet air filter, reusable aluminum 7 Blower 8 Thermal Overload, Compressor 9 Capacitor, compressor, start 10 Capacitor, compressor 11 Terminal block 12 Power cord 13 Temperature controller Level I Level II (digital) 14 Mounting Gasket Kit Part No. 29412010SP 52602800SP See Components List 89100261SP 29410200SP 10100032SP See Components List See Components List See Components List See Components List 086912SP Consult Factory 10110614SP 29410002SP 14 | nVent.com/HOFFMAN TECHNICAL INFORMATION DESIGN DATA Model Voltage Hz CR290216GXXX 115 50/60 Phase 1 MOPD Amps Full Load Cooling Amps BTU/Hr @ Max Ambient Temperature °F/°C Max Ambient Shipping Temperature °F/°C Weight lb/kg 15 9.2/7.8 2600/3000 131/55 98/44 CR290226GXXX 230 50/60 1 15 3.7/3.6 2600/2700 131/55 CR290246GXXX 460 50/60 1 15 2.0/1.9 2600/2700 131/55 CR290416GXXX 115 50/60 1 15 12.7/12.1 3500/4000 131/55 CR290426GXXX 230 50/60 1 15 4.7/4.9 3500/4000 131/55 CR290446GXXX 460 50/60 1 15 2.4/2.5 3500/4000 131/55 -XXX will be replaced with a three-digit number designating all desired options. Consult the factory for specific model numbers. 98/44 108/49 118/54 118/54 128/58 SYSTEM CONTROLS LEVEL I TEMPERATURE CONTROLLER The Level I controller is located inside the air conditioner. To adjust, disconnect power to the air conditioner and open the front panel by loosening the front panel screw. Refer to Parts List diagram on page 14 to locate the controller. Turn the controller adjustment screw slot counter-clockwise to increase and clockwise to decrease the temperature set point, see Figure 1. The thermostat cooling set point is indicated by the alignment of the adjustment screw slot with the dial decal. After completing adjustment, close the front panel and tighten the front panel screw. Restore power to the air conditioner for operation. LEVEL II AND III TEMPERATURE CONTROLLER The Level II and III controller mounted on the air conditioner front panel is factory set for standard operation. All operating parameters are programmable for custom applications. Refer to the Level II and III programming and Operating Instruction Manual, 10-1008-161. Figure 1 Level I control nVent.com/HOFFMAN | 15 TEMPERATURE CONTROL The electromechanical thermostat is factory preset to 75 °F/23 °C. To change the temperature setting, refer to SYSTEM CONTROLS on page 15. PRINCIPLES OF OPERATION If electrical power to the air conditioner is interrupted and reapplied immediately (within 3 to 5 seconds), the compressor may not restart due to the high back pressure of the compressor. It takes a minimum of one (1) minute after shut-down for the compressor suction and discharge pressures to equalize in order for the air conditioner to restart. Operating the air conditioner below the minimum ambient temperature or above the maximum ambient temperatures indicated on the nameplate voids all warranties. It is recommended that the warranty section of this manual be read in order to familiarize yourself with parameters of restricted operation. The moisture that the enclosure air can contain is limited. If moisture flows from the drain tube continuously this can only mean that ambient air is entering the enclosure. Be aware that frequent opening of the enclosure's door admits humid air which the air conditioner must then dehumidify. MAINTENANCE Performing preventative maintenance (PM) helps to keep your nVent HOFFMAN AC unit operating at the highest most efficient levels. Maintenance should be performed at least twice a year, more frequently when in challenging conditions, such as dusty, high humidity, high heat, oily or corrosive environments. Product failures due to lack of maintenance may impact warranty coverage. COMPRESSOR The compressor requires no maintenance. It is hermetically sealed, properly lubricated at the factory and should provide years of satisfactory operating service. Visually inspect the compressor for proper operation, mounting, visible signs for exposure to high heat. Should the refrigerant charge be lost, recharging ports (access fittings) on the suction and discharge sides of the compressor are provided for recharging and/or checking suction and discharge pressures. Under no circumstances should the access fitting covers be loosened, removed or tampered with unless authorized refrigeration repair service personnel. Breaking of seals on compressor access fittings during warranty period will void warranty on hermetic system. Recharging ports are provided for the ease and convenience of reputable refrigeration repair service personnel for recharging the air conditioner. INLET AIR FILTER Proper maintenance of the ambient air filter is critical to normal operation of the air conditioner. If filter maintenance is delayed or ignored, this can result in decreased performance and/or premature failure of the compressor and other air conditioner components. Do not run the air conditioner for extended periods of time with the filter removed. Particles of dust, lint, etc., can plug the fins of the condenser coil which will give the same reaction as a plugged filter. The condenser coil is not visible through the filter opening, so protect it with a filter. Continued operation under the above conditions can and will damage and shorten compressor life. HOW TO REMOVE, CLEAN OR INSTALL A NEW INLET AIR FILTER Research Products (RP) aluminum washable air filters are designed to provide excellent filtering efficiency with a high dust holding capacity and a minimum amount of resistance to air flow. Since they are constructed entirely of aluminum, they are lightweight and easy to service. Optimum filter performance is maintained by recoating the filters after washing with RP Super Filter Coat adhesive. To achieve maximum performance from your air handling equipment, air filters should be cleaned on a regular basis. The inlet air filter is located behind the right side panel. To access the filter, pull from slot on top cover. The filter may now be cleaned or a new filter installed. 16 | nVent.com/HOFFMAN Cleaning Instructions: 1. Flush the filter with warm water from the exhaust side to the intake side. DO NOT USE CAUSTICS. 2. After flushing, allow filter to drain. Placing it with a corner down will assure complete drainage. 3. Recoat the filters with RP Super Filter Coat adhesive. When spraying filter do so from both sides for maximum concentration of adhesive. CONDENSER AND EVAPORATOR AIR MOVERS Blower motor requires no maintenance. All bearings, shafts, etc. are lubricated for the life of the motor during manufacturing. If one of the condenser impeller motors (ambient impellers) should fail, it is not necessary to remove the air conditioner from the cabinet or enclosure to replace the blower. The condenser blower is mounted on its own bulkhead and is easily accessible by removing the front cover. CAUTION: Operation of the air conditioner in areas containing airborne caustics or chemicals can rapidly deteriorate filters, condenser coils, blowers and motors, etc. Contact nVent Equipment Protection for special recommendations. REFRIGERANT LOSS Each air conditioner is thoroughly tested prior to leaving the factory to insure against refrigeration leaks. Shipping damage or microscopic leaks not found with sensitive electronic refrigerant leak detection equipment during manufacture may require repair or recharging of the system. This work should only be performed by qualified professionals, generally available through a local, reputable air conditioning repair or service company. Refer to the data on the nameplate which specifies the type of refrigerant and the charge size in ounces. Before recharging, make sure there are no leaks and that the system has been properly evacuated into a deep vacuum. nVent.com/HOFFMAN | 17 PREVENTATIVE MAINTENANCE/INSPECTION Maintenance/Inspection Recommendations (Perform at least 2 times per year more frequently as required by operational environment) Last Completed Check Point Description Date Operational Inspection Run unit through all modes of operation and record temperatures, voltages, and amperes Comments: Visual Inspection Visually inspect unit for damage, cleanliness, missing, loose, or broken parts Comments: Filter Maintenance Inspect, clean, and replace filter as necessary Comments: Clean Unit Inspect and clean coils, fans/blowers, louvers, air inlets/outlets, interior and exterior of unit as required Comments: Controller Cycle Sequence Cycle the controller through all modes of operation to ensure proper cycling and temperature setpoint operation. Adjust to proper setting (Typically 25°30°) Comments: Air Flow and Circulation Inspect AC unit, cabinet, and surrounding area to ensure adequate airflow to and from the unit on both the inlet and outlet air channels for the ambient and cabinet air Comments: Seals, Gaskets, and Leaks Inspect and repair the seals, gaskets, and access holes around the unit and/or cabinet that show signs of leaking air and/or moisture Comments: Condensate and Drains Inspect and clean the condensate pans and drains to ensure proper drainage and dissipation of moisture Comments: Electrical/Wiring Inspect for loose, damaged, corroded, or chaffing wiring and connections. Tighten, insulate, or tie-up wires as required Comments: Options and Accessories Check operation and functionality of optional and accessory items such as digital display/controller, door switches, alarm switches, air baffles/deflectors, etc. Comments: Refrigeration System Inspect refrigeration tubing/lines for signs of leaks, rubbing, corrosion, or damage. Check the compressor for proper operation, mounting, and visible signs of exposure to high heat Comments: Maintenance Records Update maintenance records on the unit and in the management system Comments: Date Date Date 18 | nVent.com/HOFFMAN TROUBLE SHOOTING "Unit won't Cool" w/ Manual Tstat 115V/230V/460V Possible low charge. Verify pressures, contact HVAC certified Technician. Replace fan. Does the unit have correct supply voltage? NO YES Correct voltage and retest. OR Contact certified electrician. Is the internal temp 10 F above cooling YES setpoint. NO Is compressor YES running? NO YES Is the fan running? YES NO Is there correct voltage to the fan? YES Is the filter and condenser coil clean? NO NO Possible Causes: Bad wiring Check connections Adjust Tstat setting (turn clockwise) to call for cooling. (if temp is below 80 F stop screw can be removed to adjust T-stat lower for testing purposes). Does thermostat close? See "Compressor won't start" flowchart. Clean filter/coil accordingly. Contact Customer Service for new filter if needed. NO Replace Thermostat UNIT W/ CONTROLLER "Unit won't turn on and/or cool." Possible low charge. Verify pressures, contact HVAC certified Technician. Replace fan. Does the unit have correct supply voltage? NO YES Is controller illuminated? YES NO Correct voltage and retest. OR Contact certified electrician. See "Compressor wont start" flowchart. Is the alarm indicator light NO illuminated? YES NO Is compressor running? YES YE S Is the fan running? YES NO Is there correct voltage to the fan? YES Is the filter and condenser coil clean? NO NO Possible Causes: Bad wiring Check connections Verify supply voltage to controller. NO Possible Causes: 24V Transformer Bad Rectifier Check Wiring Refer to error codes chart. Replace controller Clean filter/coil accordingly. Contact Customer Service for new filter if needed. nVent.com/HOFFMAN | 19 CR29 Compressor wont start (Unit w/ Manual Tstat) Is the enclosure temp 10 F above YES set point. NO Adjust Tstat setting (turn clockwise) to call for cooling. (if temp is below 80 F stop screw can be removed to adjust T-stat lower for testing purposes) Does thermostat close? NO Replace Thermostat Is the thermal overload closed? NO Replace thermal overload YES is Compressor Relay/Start relay NO Replace Compressor Relay / Start Relay energized? YES Check capacitor(s) for proper NO capacitance. YES Replace capacitor(s). Possible Cause: Bad wiring/connections Replace compressor Compressor won't start (Unit w/ Controller) Adjust set point or parameters accordingly. Is Unit calling for cooling? YES Is the cooling relay closing? Is enclosure temperature NO greater than 7 degrees of YES set temp. Possible Cause: NO Bad relay Bad wiring/connections Check Controller output Is the alarm indicator light illuminated? Is the thermal YES Is compressor relay / NO overload closed? start relay energized? Check if controller is on/active? Refer to error code chart in manual. Replace compressor relay / start Relay NO YES Replace thermal overload Check capacitor(s) for proper NO capacitance. YES Replace capacitor(s). Possible Cause: Bad wiring/connections Replace compressor Activate controller. See controller section in manual for instrctions. Contact Technical Support (763) 4222211, prompts 1, 2 ,3 20 | nVent.com/HOFFMAN Evaporator Coils Freezing (Unit w/ Manual Tstat) Is the fan running? NO YES Is voltage to inoperable fan correct? Possible Causes: Electrical connections Bad fan Possible Causes: Faulty electrica connections for fan. Is the enclosure Does the unit have proper airflow? YES properly sealed NO (No outside air leaking in)? Replace seals and gaskets on enclosure. Monitor for normal operation YES NO Clean/replace filter and clean condensor coil Verify compressor can Possible Causes: satisfy cooling setpoint NO Leak / Low Refrigerant YES Verify cooling setpoint is at recommended level. If yes, contact technical support. Evaporator Coils Freezing (unit with controller) Is the fan running? No YES Does the unit have proper airflow? YES NO Clean/replace filter and clean condensor coil Is voltage to inoperable fan correct? Is the enclosure properly sealed (No outside air leaking in)? Replace Fan Check electrical connections Check that controller fan Contact Technical indicators are illuminated NO Support (763) 422-2211, prompts 1, 2 ,3 Replace seals and gaskets NO on eclosure. Monitor for normal operation YES Can compressor satisfy cooling setpoint? Possible Causes: NO Leak / Low Refrigerant YES Contact Technical Support (763) 422-2211, prompts 1, 2 ,3 nVent.com/HOFFMAN | 21 Unit Tripping Breaker (Controller or Manual Tstat) Does breaker trip instantaneosly? NO YES Check power connections and components for possible short circuit. Verify correct power supply. Does breaker trip when YES Compressor comes on? NO Check electrical connections and component amp draw. Is the compressor YES shorted to ground? NO Are fuse and breaker the correct type and sized accordingly? YES NO Replace fuse or breaker with correct type and size. Replace Compressor Check electrical connections and component amp draw. Water in the enclosure Is condensate drain plugged/restricted? YES NO Is cabinet properly sealed? (door gaskets, conduit openings, mounting gaskets, YES etc.) NO Properly seal cabinet Unplug/remove restriction Is unit icing up? YES NO Contact Tech Support 763-422-2211 ext 1-2-3 See Evaporator coils freezing up flowchart. 22 | nVent.com/HOFFMAN For Additional technical support: · Call 763-422-2211 or · Email cooling.service@nVent.com or · Download Field Service Request (FSR) from: http://HOFFMAN.nVent.com/en-us/cooling-field-service-request F-GAS INFORMATION CR290216GXXX Refrigerant Kühlmittel Chlodziwo R513A GWP 573 Factory Charge 340 Grams Füllmenge durch Hersteller 340 Gramm Oplata Fabryczna 340 Gramów CO2 Equivalent CO2 Equivalent CO2 Ekwilalent 0.195 Tons 0,195 Tonnen 0,195 Tony CR290226GXXX CR290246GXXX CR290416GXXX CR290426GXXX CR290446GXXX R513A 573 312 Grams 312 Gramm 312 Gramów 0.179 Tons 0,179 Tonnen 0,179 Tony nVent.com/HOFFMAN | 23 24 | nVent.com/HOFFMAN nVent.com/HOFFMAN | 25 26 | nVent.com/HOFFMAN nVent.com/HOFFMAN | 27 nVent 2100 Hoffman Way Anoka, MN 55303 USA +1.763.422.2211 +1.763.576.3200 https://nVent.com/HOFFMAN Our powerful portfolio of brands: ©2024 nVent. All nVent marks and logos are owned or licensed by nVent Services GmbH or its affiliates. All other trademarks are the property of their respective owners. nVent reserves the right to change specifications without notice. 89104461 nVent.com/HOFFMAN | 28