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Related Manuals for nVent Hoffman SPECTRACOOL NHZ28 Series
Summary of Contents for nVent Hoffman SPECTRACOOL NHZ28 Series
- Page 1 We connect and protect SPECTRACOOL Air Conditioner, Hazardous Locations NHZ28 Model Rev. B P/N 89215757...
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Page 2: Table Of Contents
Connecting Units Together In Lead/Lag Mode ..............................24 Air Conditioner Unit Remote Communication Features ............................25 USB Communication ....................................25 Ethernet Communication ...................................25 Using nVent HOFFMAN Pc Interface Tool ................................25 USB Communication Mode ..................................25 Ethernet Communication Mode ................................26 Remote Access Control Pin-Out ..................................28 Maintenance ......................................29... -
Page 3: Warranty And Return Policy
WARRANTY AND RETURN POLICY https://hoffman.nVent.com/en-us/cooling-warranty-registration https://nvent.widen.net/s/s8xgmxhvk2/89153291 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. -
Page 4: Handling And Testing The Air Conditioner
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. TEST FOR FUNCTIONALITY BEFORE MOUNTING THE AIR CONDITIONER TO THE ENCLOSURE. Refer to the nameplate for proper electrical current requirements. -
Page 5: Dimension Drawing
CAUTION: MISE EN GARDE: The unit is meant to be installed in an enclosure suitable for the L’unité doit être installée dans une armoire adaptée à environment listed previously and such thatthe field wiring and l’environnement susmentionné et de telle sorte que le câblage controls are only accessible with the use of a tool. -
Page 6: Mounting Cutout Dimension
MOUNTING CUTOUT DIMENSION Mounting Gasket Adheres to Air Conditioner nVent.com/HOFFMAN... -
Page 7: Wire Diagrams And Schematics
WIRE DIAGRAMS AND SCHEMATICS GENERIC 115 V WIRE DIAGRAM (ACTUAL UNIT OPTIONS MAY VARY) 50/60 Hz nVent.com/HOFFMAN... -
Page 8: Generic 115V Schematic (Actual Unit Options May Vary)
GENERIC 115 V SCHEMATIC (ACTUAL UNIT OPTIONS MAY VARY) nVent.com/HOFFMAN... -
Page 9: Generic 230V Wire Diagram (Actual Unit Options May Vary)
GENERIC 230 V WIRE DIAGRAM (ACTUAL UNIT OPTIONS MAY VARY) 50/60 Hz nVent.com/HOFFMAN... -
Page 10: Generic 230V Schematic (Actual Unit Options May Vary)
GENERIC 230 V SCHEMATIC (ACTUAL UNIT OPTIONS MAY VARY) nVent.com/HOFFMAN... -
Page 11: Generic 460V Wire Diagram (Actual Unit Options May Vary)
GENERIC 460 V WIRE DIAGRAM (ACTUAL UNIT OPTIONS MAY VARY) 50/60 Hz nVent.com/HOFFMAN... -
Page 12: Generic 460V Schematic (Actual Unit Options May Vary)
GENERIC 460 V SCHEMATIC (ACTUAL UNIT OPTIONS MAY VARY) nVent.com/HOFFMAN... -
Page 13: Components List
COMPONENTS LIST NHZ280416GXXX NHZ280426GXXX NHZ280446GXXX 115 V 1-Phase 230 V 1-Phase 460 V 1-Phase Part Description 50/60Hz 4000BTU 50/60Hz 4000BTU 50/60Hz 4000BTU Capacitor, Compressor, Start 89176325SP 10103208SP 10103208SP Capacitor, Compressor, Run 52603220SP 52603220SP Capacitor, Condenser Impeller 52603213SP 52603214SP 52603214SP Coil, Evaporator 89068414SP 89068414SP 89068414SP... -
Page 14: Parts List
PARTS LIST Part Description Part No. Compressor See Components List PART NUMBER DESCRIPTION QTY. 89111999 COMP,AE4450Y-AA1A, 115V, R134A Relay, Compressor Start See Components List 89115078 REALY, START, 115V 89112001 START CAPACITOR W/RESISTOR Capacitor, Compressor, Start See Components List 89068416 COIL, COND, 2-ROW, 4K, N28 Coil, Condenser 89068416SP 89114225... -
Page 15: Technical Information
TECHNICAL INFORMATION Design Data BTU/Hr @ Max Ambient MOPD Full Load Max Ambient Temperature Shipping Model Voltage Phase Amps Cooling Amps Temperature °F/ °C Wight lb/kg NHZ280416GXXX 110 / 115 50 /60 10.2 / 9.4 3940 / 4104 125 / 52 84 / 38 NHZ280426GXXX 50 / 60... -
Page 16: Door Switch
Note that HOFFMAN network card (RAC module) is acting as a gateway to the digital thermostat where temperature setpoints and alarm can be viewed and/or changed remotely. Note: nVent HOFFMAN network card (RAC module) is an optional accessory, therefore, some of the air conditioners ship without the network card but it is upgradable upon request. - Page 17 Figure 2 Display KEYPAD Symbol Color Icon Indication Icon Status Alarm - active when alarm is detected Flashing when alarm is detected Keypad Select – access to passcode , hold 5 sec to turn unit White ON/OFF, parameter menu, parameter setting, write or save to EEPROM, and hold for 3sec to return to main screen Keypad Up –...
- Page 18 ICONS Symbol Color Icon Indication Icon Status • Flashing while waiting for compressor to White Compressor Running turn ON • Steady ON while compressor is running White Evaporator Running White Electric heater ON White Primary and/or lead controller Compressor and Condenser fan OFF White Freeze control while illuminated...
- Page 19 nVent.com/HOFFMAN...
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Page 20: Displaying And Changing Program Settings
DISPLAYING AND CHANGING PROGRAM SETTINGS TO VIEW OR ACCESS THE SETTINGS TO ACCESS FOLDER MENUS: 1. Press button to display passcode screen, the screen displays PSd on line 1 and 0000 on line 2. 2. Press button to access to passcode , the first digit of 0000 is flashing and press 3 more times until the last digit of 0000 flashes. -
Page 21: View Alarms
VIEW ALARMS Alarms may be viewed when the alerting icon is flashing. 1. On the main screen, press the alerting icon button 2. The screen displays the most recent or newest alarm where the alarm code display on line 1 and the alerting icon is now in steady 3. -
Page 22: Displaying Temperature Data On Screen
TO RESET PARAMETERS TO FACTORY DEFAULT This option is ONLY applied if the operator wants to reset all control parameters back to factory default. 1. Follow instructions above to enter the passcode and open the reset folder (rStF). 2. The screen displays rSAL, press arrow to navigate to rSPA and then press button 3. -
Page 23: Connecting Units Together In Primary/Secondary Mode
5. Any unit that loses communication with the primary unit will enter standalone mode and continue operating based on its own temperature probe until communication is re-established. 6. All temperature setpoints and alarms can be viewed remotely if one of the ACUs is equipped with HOFFMAN network card (RAC module). -
Page 24: Connecting Units Together In Lead/Lag Mode
8. Set parameter H01 to PS (primary-secondary). Note that after H01 = PS, the snowflake icon is illuminated and line 2 changes its display information from outlet temperature to device ID, for example, line 2 displays 01:02 where 01 indicates controller #1 and 02 indicates the total number of the controllers in a group network. -
Page 25: Air Conditioner Unit Remote Communication Features
Ethernet or USB connection. With nVent HOFFMAN PC Interface Tool a user has the ability to remotely manage and monitor hundreds of nVent HOFFMAN air conditioners both domestically and globally at one central location at user’s own pace, so long as all air conditioners are configured in the same subnet in the network. -
Page 26: Ethernet Communication Mode
Each of the setpoint should match the new variables that just entered from the Single ACU Settings tab. TO VIEW AND CHANGE THE ETHERNET CARD (RAC) INFORMATION • In the nVent HOFFMAN A.C. Monitor main screen, select Single ACU Ethernet Info tab and notice that the Reprogram ACU button is disabled. •... - Page 27 Refer to remote access control (RAC) Instruction Manual for configuring multiple units and with text message and email capability in nVent HOFFMAN A.C. Monitor software. The remote access control Instruction Manual, P/N: 89091002 can be downloaded from nVent support center link, https://www.nVent.com/en-us/HOFFMAN/remote-access-control.
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Page 28: Remote Access Control Pin-Out
REMOTE ACCESS CONTROL PIN-OUT FUNCTION NAME PIN# WIRE# RETURN BLK75 ENCL MI BLK77 COOL ORG78 HEAT BRN76 RETURN YEL39 ALAR RELAY OUTPUT YEL38 GROUND BLK40 POWER (24VAC) WHT41 INLET TEMP PROBE DOOR OPEN SWITCH WHT63 GROUND RESERVED OUTLET TEMP PROBE RED45 MAL-FUNCTION ALARM BLU88... -
Page 29: Maintenance
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. -
Page 30: Condensate Management And Drain Trap Maintenance
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. -
Page 31: Preventative Maintenance/Inspection
PREVENTATIVE MAINTENANCE/INSPECTION Maintenance/Inspection Recommendations Last Completed (Perform at least 2 times per year – more frequently as required by operational environment) Check Point Description Date Date Date Date Run unit through all modes of operation and record temperatures, Operational Inspection voltages, and amperes Comments: Visually inspect unit for damage, cleanliness, missing, loose, or... -
Page 32: Trouble Shooting
TROUBLE SHOOTING “Unit wont turn on Possible low charge. –Visually inspect for leaks and/or cool.” –Verify pressures –Contact HVAC certified Technician Replace inoperable fan. Correct voltage Does the unit have See “Compressor CONDENSER FAN and retest. wont start” flowchart. Possible Causes: correct supply voltage (+/- 10% –Check wiring... - Page 33 Evaporator Coils Freezing Replace Fan Check electrical connections Are the evaporator Is there voltage to and condenser fan(s) inoperable fan? running? –Check Manual for Controller Check that controller Operation procedures fan indicators are –Contact Technical Support illuminated (763) 422–2211, prompts 1, 2, 3. Is cabinet properly sealed? Replace seals and Does the unit have...
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Page 34: F-Gas Information
Water in the Enclosure Is condensate drain Unplug/remove restriction plugged/restricted? Is cabinet properly sealed? (door gaskets, See Evaporator coils Is unit icing up? conduit openings, freezing up flowchart. mounting gaskets, etc...) Contact Technical Support (763) 422–2211, prompts 1, 2, 3. Properly seal cabinet For Additional technical support: •... - Page 35 nVent.com/HOFFMAN...
- Page 36 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.
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