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nVent Hoffman Spectracool N28 Instruction Manual

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We connect and protect
Spectracool
Air Conditioner
N28 Model
Instruction Manual
R513A
P/N 89215756 Rev. B

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Summary of Contents for nVent Hoffman Spectracool N28

  • Page 1 We connect and protect Spectracool Air Conditioner N28 Model Instruction Manual R513A P/N 89215756 Rev. B...
  • Page 2 TABLE OF CONTENTS Warranty And Return Policy ..................................3 General Safety Instructions ..................................4 Receiving The Air Conditioner ..................................4 Handling And Testing The Air Conditioner ..............................4 How To Read Model Numbers ..................................4 Installation Instructions ....................................5 Dimension Drawings ....................................5 Models with Thermostats ....................................5 Models with Remote Access Control ..................................
  • Page 3 Connecting units together in lead/lag mode ............................29 Air conditioner unit remote communication features ............................30 USB communication ....................................30 Ethernet communication ...................................30 Using nVent HOFFMAN PC interface tool ................................ 31 USB communication mode ..................................31 Ethernet communication mode ................................32 Remote access control pin-out ..................................33 Maintenance ......................................34...
  • Page 4 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 5 INSTALLATION INSTRUCTIONS 1. Inspect the air conditioner and verify correct functionality before mounting the air conditioner. See HANDLING AND TESTING THE AIR CONDITIONER on page 4. 2. Using the cutout dimensions shown in this manual, prepare “IN” and “OUT” openings and mounting bolt hole pattern for enclosures. Select an installation location that will allow for adequate ventilation and clearance for service.
  • Page 6 Models with Remote Access Control nVent.com/HOFFMAN...
  • Page 7 MOUNTING CUTOUT DIMENSION Note: Mounting Gasket Adheres to Air Conditioner nVent.com/HOFFMAN...
  • Page 8 WIRE DIAGRAMS AND SCHEMATICS Generic 115 V 1-Phase with Thermostat Wire Diagram (actual unit options may vary) CUSTOMER SWITCH POWER BLOCK T'FORMER RELAY WHT61 BLU9 YEL10 RED62 BLK60 MALF SWITCH DOOR SWITCH (OPT.) (OPTIONAL) YEL65 SUPPRESSOR RED30 (OPTIONAL) YEL10 OR YEL65 COOLING T-STAT RED13...
  • Page 9 Generic 115 V 1-Phase with Thermostat Schematic (actual unit options may vary) nVent.com/HOFFMAN...
  • Page 10 4.25 Generic 230 V 1-Phase with Thermostat Wire Diagram (actual unit options may vary) 50/60 HZ 89112135 Rev.F nVent.com/HOFFMAN...
  • Page 11 Generic 230 V 1-Phase with Thermostat Schematic (actual unit options may vary) nVent.com/HOFFMAN...
  • Page 12 4.25 Generic 460 V 1-Phase with Thermostat Wire Diagram (actual unit options may vary) 50/60 HZ 5.00 89115547 Rev.E nVent.com/HOFFMAN...
  • Page 13 Generic 460 V 1-Phase with Thermostat Schematic (actual unit options may vary) nVent.com/HOFFMAN...
  • Page 14 4.250 Generic 115 V 1-Phase with Remote Access Control Wire Diagram (actual unit options may vary) 5.000 89214142 REV.C nVent.com/HOFFMAN...
  • Page 15 4.25 Generic 115 V 1-Phase with Remote Access Control Schematic (actual unit options may vary) 5.00 89204550 REV. C nVent.com/HOFFMAN...
  • Page 16 4.25 Generic 230 V 1-Phase with Remote Access Control Wire Diagram (actual unit options may vary) 50/60 HZ 89214147 REV.C nVent.com/HOFFMAN...
  • Page 17 Generic 230 V 1-Phase with Remote Access Control Schematic (actual unit options may vary) 89214186 REV. A nVent.com/HOFFMAN...
  • Page 18 4.25 Generic 460 V 1-Phase with Remote Access Control Wire Diagram (actual unit options may vary) 50/60 HZ 5.00 89214150 REV.C nVent.com/HOFFMAN...
  • Page 19 4.25 Generic 460 V 1-Phase with Remote Access Control Schematic (actual unit options may vary) 4.50 89214187 REV. B COMPONENTS LIST N280416GXXX N280426GXXX N280446GXXX 115 V 1-Phase 230 V 1-Phase 460 Volt 1 Phase Part Description 50/60 Hz 4000 BTU 50/60 Hz 4000 BTU 50/60 Hz 4000 BTU Bridge Rectifier 89087424SP...
  • Page 20 PARTS LIST Part Description Part No. Thermostat, SPDT, 55-100F 10106116SP Capacitor, Condenser Impeller See Components List Impeller, Condenser See Components List Coil, Condenser 89068416SP Compressor See Components List Filter, Air, Reusable 89068420SP Fan, Evaporator See Components List Coil, Evaporator 89068414SP Switch, HPC 52610426SP Terminal Block...
  • Page 21 TECHNICAL INFORMATION Design Data BTU/HR @ Max Ambient Max Ambient Shipping Full Load Temperature Temperature Weight Model Voltage Phase MOPD Amps Cooling Amps °F/°C °F/°C lb/kg N280416GXXX 110/115 50/60 10.1/11.2 3940/4104 125/52 84 / 38 N280426GXXX 50/60 4.9/5.0 4269/4703 125/52 84 / 38 N280446GXXX 50/60...
  • Page 22 Cooling/heating setpoint, cooling/heating differential and high/ low temperature setpoint are designed to be adjustable by the operator. All alarms are outputted through the alarm relay. In addition, if nVent HOFFMAN network card (Remote Access Control (RAC) Module) is used the parameters that state above and alarms are accessible remotely through Ethernet connection utilizing SNMP, Modbus TCP, EtherNet/IP, and Profinet protocol.
  • Page 23 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 24 nVent.com/HOFFMAN...
  • Page 25 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. 3.
  • Page 26 There are seven possible alarms (non-latching) detectable by the controller and are indicated on the controller display. All alarms are accessible locally. If a nVent HOFFMAN network card (RAC module) is used, alarms are also accessible remotely through the Ethernet and USB connection.
  • Page 27 To reset the alarms in alarm history folder The controller is designed with ability to reset or clear the alarm history 1. Follow instructions above to enter the passcode and open the reset folder (rStF). 2. The screen displays rSAL on line 2 and nO on line 1, press button the nO is flashing 3.
  • Page 28 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 nVent HOFFMAN network card (RAC module).
  • Page 29 To configure the controller from single mode to PS mode, simply follow below procedures 1. Before proceeding the PS mode configuration for each controller, make sure that the communication cable is connected from one ACU to another using a shielded cable with the shield grounded. 2.
  • Page 30 When set to zero ACU1 and ACU2 will automatically alternate every cycle. Air conditioner unit remote communication features Air conditioners that include the optional nVent HOFFMAN network card (RAC module) have remote communication capabilities utilizing SNMP, Modbus TCP, EtherNet/IP, Profinet Protocol via Ethernet connection, and Modbus RTU protocol via USB connection.
  • Page 31 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 32 A/C units configure in the same subnet in the network. Refer to remote access control (RAC) Instruction Manual for configuring multiple units and with text message and email capability in nVent HOFFMAN A.C.
  • Page 33 Remote access control pin-out FUNCTION NAME PIN# WIRE# RETURN BLK75 ENCL MI BLK77 COOL ORG78 – HEAT BRN76 RETURN YEL39 ALARM RELAY OUTPUT YEL38 GROUND BLK40 POWER (24 VAC) WHT41 – – INLET TEMP PROBE – DOOR OPEN SWITCH WHT63 GROUND RESERVED –...
  • Page 34 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 35 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 36 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 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 37 TROUBLE SHOOTING Compressor wont start (Unit w/ Manual Tstat) Possible Causes: Replace capacitor(s) - Bad Cooling If applicable: Check Is the enclosure temp Do you have voltage Contactor / Relay capacitor(s) for 10°F above set point. at compressor? - Loose Wiring proper capacitance.
  • Page 38 “Unit wont Cool” w/ Manual Tstat 115 V/230 V/460 V Does the unit have correct Correct voltage and retest.OR supply voltage? Contact certified electrician. Clean and re-test 115 V/ 460 V 260 V Contact Is the phase Is the Verify filter Is the Does Technical...
  • Page 39 Evaporator Coils Freezing (Unit w/ Manual Tstat) Possible Causes: - Electrical Possible Causes: connections Are the evaporator Is there - Faulty electrical connections for one or both fans. - Bad fan and condenser voltage to the Condenser Fan: fan(s) running? inoperable fan? - Bad HPC (if equipped) Does the capacitor...
  • Page 40 Unit Tripping Breaker (Controller or Manual Tstat) Check power connections and Does breaker components for possible short circuit. trip instantaneosly? Verify correct power supply. Is the compressor shorted Does breaker trip when Replace Compressor to ground? Compressor comes on? Are fuse / breaker the correct type Check electrical connections and component amp draw.
  • Page 41 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 N280426GXXX N280446GXXX N280416GXXX N280425GXXX Refrigerant Kühlmittel R513A R513A Chłodziwo Factory Charge 283 Grams 312 Grams Füllmenge durch Hersteller 283 Gramm 312 Gramm Opłata Fabryczna...
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  • Page 48 nVent 2100 Hoffman Way Anoka, MN 55303 USA Tel +1.763.422.2211 Fax +1.763.576.3200 nVent.com 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.