Related Manuals for Nagas DTHR Series
Summary of Contents for Nagas DTHR Series
- Page 1 1385, Lionel-Boulet blvd, Varennes, Quebec, Canada, J3X1P7 DTHR Series For installation inside an OEM air handler INSTALLATION AND OPERATION MANUAL DTHR-V9-2020...
- Page 2 Warning FIRE OR EXPLOSION HAZARD • Failure to follow safety warnings exactly, could result in serious injury, death or property damage. • Be sure to read and understand the installation, operation and service instruction in this manual. • Improper installation, adjustment, alteration, service or maintenance can cause serious injury, death or property damages.
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Page 3: Table Of Contents
Table of contents Code and regulation ....................3 Specifications ......................4 Gas supply ........................4 Gas pressure adjustments ..................5 Unit Dimensions ......................6,7 Installation guidelines ....................8,9,10,11 Installation dimensions ....................12,13,14 Electrical controls ...................... 15 Components ......................15,16,17 Flue vent and combustion air ..................18,19,20,21 Start-up instruction .................... -
Page 4: Code And Regulation
Code and regulation Important This product is intended for installation by original equipment manufacturers of listed heating equipment and should be on the positive pressure side of the circulating air blower. This heating unit is designed for industrial or commercial use only. The installation must comply with the latest laws and regulation for heating units;... -
Page 5: Specifications
Specifications Input capacity Output capacity Air flow DTHR Turndown Model ratio MBTU MBTU Min. Max. Min. Max. 15:1 2701 6481 1275 3059 17:1 3086 7407 1457 3496 21:1 3858 9259 1821 4370 17:1 4247 10193 2004 4810 20:1 5019 12054 2368 5684 23:1... -
Page 6: Gas Pressure Adjustments
Gas pressure adjustments Natural Gas Dynamic supply Nominal Manifold Pilot Low fire inlet DTHR pressure**** pressure* pressure capacity Model Minimum Maximum At maximum capacity In.w.c [kPa] In.w.c [kPa] In.w.c [kPa] In.w.c [kPa] 2.3” [0.57] 2.9” [0.72] 8.79 4.6” [1.15] 3.1” [0.77] 2.8”... -
Page 7: Unit Dimensions
Unit dimensions See installation dimensions section for more details. Note: The controls shown are on the left-hand side of the unit (for a right-hand unit, the drawing is mirrored and dimensions are identical). Installation and operation manual–DTHR-V9-2020... - Page 8 Unit dimensions: DTHR Imperial [in] Weight - Lbs Weight with options* Metric [mm] 1194 1194 1194 1334 1334 1422 1473 1549 1721 1721 1016 1016 1016 1149 1149 1149 1149 1149 1283 1283 1537 1537 1537 1537 1689 1689 1829 1829 1880 2324...
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Page 9: Installation Guidelines
Refer to the exhaust system sections of this manual. • If no control cabinet is supplied by Nagas with the unit the installer must be made one for component protection and must include aeration openings at least equal of two 2 inches holes. - Page 10 IMPORTANT NOTICE The below drawings show the recommended walls arrangements and inlet/outlet configuration that we have tested and believe will be safe. If the OEM decides to assemble the units with different wall and opening parameters, it will be his responsibility to test for safety and functionality. Horizontal discharge Step 1: Step 2:...
- Page 11 Vertical discharge Step 1: Step 2: • Install walls on each side (see dimension table); • Install the unit on an insulated floor • The walls must be in contact with the guides on the support structure; • The walls must be insulated with 2’’ of high temperature insulation.
- Page 12 Positioning of the sensor controlling the supply temperature WARNING The positioning of the supply temperature sensor is essential for the proper operation of the unit. Improper positioning of the supply temperature sensor could result in high temperatures in the supply ducts, a thermal protection shutdown, the closing of the fire damper and may result in damage to the unit and void the warranty.
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Page 13: Installation Dimensions
Installation dimensions WARNING Improper installation, adjustment, alteration can cause serious injury, death or property damages. DTHR - Horizontal discharge • Left hand control (when facing air stream). Note: The controls shown are on the left-hand side of the unit (for a right-hand unit, the drawing is mirrored, and dimensions are identical). - Page 14 DTHR – Vertical discharge • Left hand control (when facing air stream). Note: The controls shown are on the left-hand side of the unit (for a right-hand unit, the drawing is mirrored, and dimensions are identical). Installation and operation manual–DTHR-V9-2020...
- Page 15 Installation dimensions DTHR Dim. Imperial [in] Dim. Metric [mm] 1194 1194 1194 1334 1334 1422 1473 1549 1721 1721 1429 1480 1581 1778 1803 1905 1905 1905 2330 2300 1232 1232 1232 1232 1384 1384 1524 1524 1524 1918 1143 1143 1143 1143...
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Page 16: Electrical Controls
Every component requires a minimum ambient temperature during operation. If you don’t order the Nagas heating and control cabinet solution you must build your own. Also, every component must be protected from environmental elements and covered because of high voltage hazard. - Page 17 • Component identification Electrical box HMI touch screen interface Programmable logic controller (PLC) Heating element Input/Output expansion module (I/O) Ignition transformer High limit protection (set at 160 Flame safeguard module Thermostat for heating element Power supply transformer Control relays Safety pressure switches Installation and operation manual–DTHR-V9-2020...
- Page 18 Gas train Pilot solenoid valve and gas regulator Pilot manual gas valve Main manual valve (by other outside the unit) Test port inlet pressure Main gas regulator Main gas safety shutoff valve 1 Valve proving system (with IRI option) Main gas safety shutoff valve 2 Modulating gas valve actuator Modulating gas valve Low fire orifice bypass...
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Page 19: Flue Vent And Combustion Air
Flue vent and combustion air Depending on the model, the flue vent connector diameter ranges from 6 to 10 inches. The DTHR model series is designed to operate effectively and safely (against a positive pressure up to 0.25 in.w.c) with a positive stack (category III) type sealed single or double wall flue vent listed for this application, whether vertical arrangement or horizontal or a combination of both. - Page 20 The horizontal conduit sections should be supported every six feet with non-combustible products such as, chains or steel belts. Do not use the unit or the vertical conduit section as a support. Flue vent dimensions must respect the unit diameters (minimum) and maximum equivalent lengths of 100 feet calculated.
- Page 21 • Recommended roof top Flue Vent Exhaust and/or Combustion Air Duct • Recommended wall horizontal Flue Vent Exhaust and Combustion Air Duct – Concentric kit Installation and operation manual–DTHR-V9-2020...
- Page 22 • Recommended wall vertical Flue Vent Exhaust Ducting Flue vent Combustion Air Unit Flue vent diameter intake diameter diameter DTHR (minimum) (minimum) Model Inches Inches Inches 152.4 152.4 203.2 203.2 203.2 304.8 Important The flue vent and combustion air duct can have a maximum equivalent length of 100 feet calculated. The equivalent length is calculated by adding the lengths of straight sections of the flue vent, to the equivalent length of all the elbow pipes used.
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Page 23: Start-Up Instruction
Start-up instruction Important star Start-up can only be performed by a qualified technician qualified to install gas heating system (with accreditation) with knowledge in electricity and ventilation. Warning • Do not smoke during start-up. • Do not try to light the burner if the gas has accumulated in combustion chamber or in the area, if the combustion chamber is filled with vapors or if it is very hot. - Page 24 3.0 Burner adjustment Install a pressure gauge (0-10 in. w. c.) on the manifold pressure test port located downstream of the modulation gas valve. See component identification section for location. For the combustion test, it is recommended to use a (2-10VDC) manual potentiometer to simulate the modulation signal to the burner.
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Page 25: Control Sequence
Control sequence A PLC controls the burner duties by controlling the modulating gas valve, the fan speed and their relative position to each other depending on the input signal (2-10 VDC) from the temperature controller. The control sequence is defined and executed following these eight steps: 1. - Page 26 Step 3 - Pre-Purge (S40) The blower starts and set to 100% of its capacity for about 60 seconds then a 10 seconds timer to let the fan speed slow down before the burner ignition. When complete the burner ignition step is enabled.
- Page 27 Step 8 - Post-purge (S100) This step is allowed when the burner modulation request is lower than 2.3V DC for more than the low fire delay, if the heating demand is turn OFF or if an alarm has been detected with the burner operation.
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Page 28: Programmable Logic Controller Features & I/O
Programmable logic controller features & I/O Item Option Description Run/Stop Run/Stop manual switch switch SD card SD card programming slot slot Battery holder Real Time Clock battery (RTC) **Replace every 2 years (BR2032)** Cartridge slot Not used LEDs Digital inputs, relay outputs and fast output LEDs I/O states For terminal connection to a computer for programming (need USB mini-B port... - Page 29 TM4 bus Not used connector Serial line port 1 Type RJ45 (RS-232 or RS-485) - Used for HMI communication Serial line port 2 Screw terminal block type (RS-485) Input terminals Digital inputs TM3/TM2 bus For TM3 expansion modules connector Protective cover Cover for SD card, Run/Stop switch and USB mini-B programming port.
- Page 30 I/O error On: Error on serial 1 or 2, SD card, cartridge, TM4 bus or TM3 bus. SD card access Green SD card is being accessed On: Battery needs to be replaced Battery Flashing: Battery charge is low Serial line 1 Green Flashing: Activity on serial line 1 to HMI touch screen panel Not used...
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Page 31: Display (Hmi) Features
Display (HMI) features The following diagram describes the structure of different levels in the HMI Home page window Level 1 menu Level 2 menu Level 3 menu Password protected Level 4 menu Password protected Installation and operation manual–DTHR-V9-2020... -
Page 32: Run Window
Run window Run window features: Item Description This section allows the user to see what the heating demand is, which control sequence is active and how the burner reacts to the demand. The gas valve General will react with the heating demand following a linearization curve and the air blower will follow the gas valve feedback position with the correspondent value determined in the fan modulation table. -
Page 33: Level 1: Air/Gas Relation
Level 1: Air/Gas relation Air/Gas relation window : Item Description This section allows a qualified technician to adjust the 20 points air General adjustment curve (air/gas relation) for each gas valve position range. Use ‘’+ ‘’ or ‘’-‘’ to select the gas position where you want to modify the Gas feedback air ratio. -
Page 34: Level 1: Alarm History
Level 1: Alarm history Alarm history window: Item Description This section keeps a history of the last 8 alarm codes. The number 1 being the General most recent code. The alarm code number is related to an alarm type (first digit) and in which Code steps it’s happened (second digit). -
Page 35: Level 2: Fan Rpm Auto Tuning
Level 2: Fan RPM auto tuning Fan auto tune Fan RPM auto tuning window: Item Description This section is to perform an automatic fan auto tuning. This is necessary (first start-up and fan replacement) to record the RPM feedback of each General command level. -
Page 36: Level 2: Signal Supervision
Level 2: Signal supervision Signal Supervision window: Item Description This section shows how the Air/Gas relation command (Cmd) and feedback General (Fbk) reacts with the demand signal. Heat Direct heating demand signal in Volt. Gas valve modulation signal demand (first row) and actual position feedback signal (second row). -
Page 37: Level 2: Step Timer
Level 2: Step timer Step timer window: Item Description This section shows the active timer in the actual step (see #3) of the burner General sequence. Numbers can appear or disappear depending if a timer is active. In this example the prepurge step is now at 6 seconds on a 40 seconds timer. Actual Timer count in real time (sec). -
Page 38: Plc Alarms
An error message is displayed in a red window when an alarm is active. PLC alarms The following table shows the different alarms configured in the PLC. Each alarm will be displayed on a red window with the description and an alarm number on the left corner. ALARM DESCRIPTION POSSIBLE CAUSES... -
Page 39: Flame Safeguard Alarms
Flame safeguard alarms Flame safeguards warning lights status: The table below lists the most common and important operational fault codes in the flame safeguard relay. (Refer to flame safeguard instructions manual for other codes not listed in this table) Red Lights Trouble Trouble description code... -
Page 40: Flame Safeguard Troubleshooting
Flame safeguard troubleshooting Refer to the flame safeguard alarms section to get the right trouble description. Troubleshooting table Trouble description Corrective action • Verify gas supply as well as the pressure • Verify ignition transformer • Verify flame signal strength •... -
Page 41: Typical Wiring Diagram
Typical wiring diagram TYPICAL WIRING DIAGRAM Installation and operation manual–DTHR-V9-2020... - Page 42 TYPICAL WIRING DIAGRAM Installation and operation manual–DTHR-V9-2020...
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Page 43: Start / Stop Recommendations
Start / stop recommendations In emergency situation When it is necessary to stop the heater in case of emergency, turn the main switch to the OFF position and close the gas supply by closing the manual supply valve on the outside of the heater. Extended shutdown When the duct furnace is not to be used for a long period of time, it is recommended to cut and plug the gas supply. -
Page 44: Unit Maintenance
For more information please contact your local representative and authorized distributor. Unit maintenance Perform the following verifications to the necessary prescribed frequency to keep the unit in good working condition. Do not limit the inspection to this list as some environmental conditions may require other or more frequent inspections. -
Page 45: Warranty
Only dealers or contractors who are registered with us are authorized to perform this warranty. Should the dealer or the contractor need assistance, the authorized agent for Nagas is available for support, and we, at Nagas, in turn, support our agent's efforts. -
Page 46: Start-Up Report
Start-up report Unit tag: ____________________________________ Project: ______________________________________ Technician: ____________________________________ Address: ______________________________________ Contractor: _____________________________________ email: ______________________________________ Phone #: _____________________________________ Manufacturer information Model number: _________________________________________ Serial number: __________________________ Inspection Unit casing: Combustion air proving switch: Airflow switch: Gas leak: Control panel installed (by other): Gas vents if applicable: Combustion air openings: High limit adjustment:... - Page 47 Combustion Ambient temperature: _______________°F Oxygen Gas flue Room Efficiency Excess air PPM CO* Signal Temp. °F Temp. °F (Air free) 2.5V 4.0V 6.0V 8.0V 9.0V 10.0V *This value must be as low as possible and must never exceed 400 ppm. Note: ___________________________________________________________________________________________________ ___________________________________________________________________________________________________...