Trane DFIA Installation Operation & Maintenance
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Trane DFIA Installation Operation & Maintenance

Direct-fired make-up air units
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Installation Operation
Maintenance
Direct-Fired Make-Up
Air Units
DFIA
DFOA
February 2007
MUA-SVX01A-EN

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  • Page 1 Installation Operation Maintenance Direct-Fired Make-Up Air Units DFIA DFOA MUA-SVX01A-EN February 2007...

  • Page 2: Table Of Contents

    DFIA Model Number Descriptions........8...
  • Page 3 Contents Unit Shutdown ..........46 Electrical Requirements .
  • Page 4 Contents MUA-SVX01A-EN...

  • Page 5: Overview Of Manual

    Overview Overview of Manual Note: One copy of this document ships inside the control panel of each unit and is customer property. It must be retained by the unit’s maintenance personnel. This booklet describes proper installation, operation, and maintenance procedures for air cooled systems. By carefully reviewing the information within this manual and following the instructions, the risk of improper operation and/or component damage will be minimized.

  • Page 6: General

    General Information WARNING The maintenance and Trouble Shooting procedures recommended in this section of the manual could result in exposure to electrical, mechanical or other Hazardous Service potential safety hazards. Always refer to the safety warnings provided Procedures! throughout this manual concerning these procedures. When possible, disconnect all electrical power including remote disconnects and discharge all motor start/run capacitors before servicing.
  • Page 7 General Information All Trane equipment has been factory tested, adjusted, metered and inspected to meet conditions set at the time the order was placed. Only minimal adjustments should be required. All information in this service manual is typical. All products are semi-custom and changes may occur.

  • Page 8: Model Numbers

    Model Numbers DFIA Model Number Descriptions A 10 0 A H N E 0 0 0 1 0 0 0 AZ AL AN AP AQ DS CA AX A5 BD AY 4 56 8 9 10 1 12 13 14 16 1 DIGITS 1,2,3 —UNIT DESCRIPTION...
  • Page 9 Model Numbers DIGIT 13 —GAS TRAIN APPROVALS No Selection Standard Gas Train IRI Gas Train Approval (ETL) FM Gas Train Approval (ETL) IRI Gas Train Approval (No ETL) FM Gas Train Approval (No ETL) DIGIT 14 —BURNER INPUT RATING (NATURAL GAS/PROPANE) No burner input selection 2755/225 MBH Input 550/450 MBH Input...
  • Page 10 Model Numbers DIGIT 17 — MOTOR SPEED AND STARTER No Selection Single Speed odp 1800 rpm Single Speed tefc 1800 rpm Single Speed ener. effic odp Single Speed ener. effic tefc 2s1w odp 1800/900 rpm 2s2w odp 1800/1200 rpm DIGIT 18 —FAN ARRANGEMENT Horizontal arrangement 1 top Horizontal arrangement 2 side Horizontal arrange 3 bottom...
  • Page 11 Model Numbers DIGIT 32 —UV FLAME SENSOR AL Ultra violet (UV) flame sensor DIGIT 34 —CLOGGED FILTER INDICATOR AN Clogged filter indicator DIGIT 36 —EXHAUST INTERLOCK AP Exhaust interlock DIGIT 38 —INTERLOCKING RELAY AQ Interlocking relay DIGIT 40 —OMIT DISCONNECT SWITCH DS Disconect switch AT Omit disconnect switch DIGIT 42—HIGH GAS PRESSURE REGULATOR...

  • Page 12: Dfoa Model Number Description

    Model Numbers DFOA Model Number Description O A 109 A N H E 0 0 0 2 0 0 0 0 0 0 D F G K M N P Q R 7 Y 8 2 M # 4 567 8 9 14 15 16 17 18 19 20 21 22 23 6 27 30 32 33 34 35 36 39 41 42 43 44 45 46...
  • Page 13 Model Numbers DIGIT 12 —GAS TRAIN APPROVALS No Selection Standard Gas Train IRI Gas Train Approval (ETL) FM Gas Train Approval (ETL) IRI Gas Train Approval (No ETL) FM Gas Train Approval (No ETL) DIGIT 13 —BURNER INPUT RATING (NATURAL/PROPANE) 275/225 MBH Input 550/450 MBH Input 825/675MBH Input...
  • Page 14 Model Numbers DIGIT 16 —MOTOR SPEED AND STARTER No Selection Single Speed odp 1800 rpm Single Speed tefc 1800 rpm Single Speed ener. effic odp Single Speed ener. effic tefc 2s1w odp 1800/900 rpm 2s2w odp 1800/1200 rpm DIGIT 17 —FAN ARRANGEMENT Horizontal Arrangement 2, Front Horizontal Arrangement 3,...
  • Page 15 Model Numbers DIGIT 23 —MOTORIZED OUTLET DAMPER 0 No motorized outlet damper C Motorized outlet damper DIGIT 24 —INSULATION D Insulation on entire unit DIGIT 25 —INTERNAL BLOWER/MOTOR ISOLATION F Internal blower/motor isolation DIGIT 26—EXTENDED GREASE LINES G Extended grease lines DIGIT 27 —115V DUPLEX SERVICE RECEPTACLE K 115 volt duplex service receptacle DIGIT 28—PAINTED BASIC UNIT AND ACCESSORIES...
  • Page 16 Model Numbers DIGIT 36—LOW GAS PRESSURE BURNER 8 Low gas pressure burner DIGIT 37—VIBRATION OPTIONS Z Vibration feet-full unit DIGIT 38 —CONTROL OPTIONS 2 7 day time clock On/off night setback thremostat 7 BACview remote panel DIGIT 39—DISCHARGE LOUVER M Discharge louver DIGIT 40—SEPARATOR FOR UNIT MODEL NUMBER # Separator for AOS model number DIGIT 41 —...

  • Page 17: General Information

    For all arrangements shown, controls, gas piping and fan motor are on the near side. Selected horizontal units are available with special options — cooling coils (DX, chilled water), steam and electric coils, no burner section. Contact your Trane representative for availability and pricing. Figure 1. Horizontal Configurations...

  • Page 18: Vertical Configurations

    General Information Vertical Configurations (DFOA only) For all arrangements shown, the gas piping and controls are on the near side. Selected vertical units are available with special options — steam and electric coils, no burner section. Figure 2. Vertical configuration DFOA only Fan Arrangement #4 Fan Arrangement #6 Side Discharge...

  • Page 19: Vertical Configurations

    (EC) and disconnect are on the side opposite the air entering side. Selected vertical units are available with special options – steam and electric coils, no burner section. Contact your Trane representative for availability. Figure 3. (DFIA only) vertical configurations...
  • Page 20 General Information Table 1. General Data Table DFIA, DFOA Unit Size DFIA Airflow Minimum 1600 3250 4500 6500 9000 11000 14000 2200 9000 12500 18000 25000 30000 44000 Airflow Maximum 3000 4350 6000 8500 11000 15000 20000 30000 12000 17000...

  • Page 21: Pre-Installation Check List

    Pre-Installation Check List WARNING! Product contains fiberglass wool. Disturbing the insulation in this product during installation, maintenance or repair will expose you to airborne particles of Fiberglass Wool! glass wool fibers and ceramic fibers known to the state of California to cause cancer through inhalation.
  • Page 22 Pre-Installation Check List If any damage is found, the consignee should sign the bill of lading indicating such damage and immediately file claim for damage with transportation company. Direct Fired Make-up AIr• MUA-SVX01A-EN...

  • Page 23: Weights And Clearances

    Weights and Clearances DFIA only Figure 4. Plan View DFIA Table 2. DFIA Weights in pounds (approximate) Vertical Unit Blower Support Inlet Inlet bank Burner Return Discharge Size Section Stand Hood Damper Filter Section Louver 159 439 159 159 159 439 159 159...

  • Page 24: Dfoa Only

    Weights and Clearances DFOA Only Figure 5. Plan View DFOA Unit Unit Table 3. DFOA Weights in pounds (approximate) Vertical Unit Blower Support Inlet Inlet Bank Burner Return Discharg Size Section Stand Hood Damper Filter Section e Louver 159 439 159 439 1262 224 590...

  • Page 25: Rigging/ Suspension

    Rigging/ Suspension The following list is submitted in addition to the installation requirements and not intended to supersede regulations or codes having jurisdiction. It is recommended these items be reviewed and completed prior to requesting or initiating equipment start-up. Assemble the curb, or other means of unit support (if applicable) in the desired location in accordance with mechanical and structural plans.
  • Page 26 Rigging/ Suspension Figure 7. Vibration Feet Assembly (typical for indoor units) Right hand shown, left hand opposite. Note 7. Note 8. Unit configuration shown may not match specific configuration. Lifting points shown are typical per section (section order is not relevant). Size 109-118 6"...
  • Page 27 Rigging/ Suspension Figure 9. Hanging assembly typical for Indoor Units Denotes typical hanging for Denotes typical hanging obstructed holes for unobstructed holes Note 9. . Right hand shown, left hand opposite. Note 10. 2. Unit configuration shown may not match specific configuration. Lifting points shown are typical per section (section order is not relevant).

  • Page 28: Installation

    Installation Pre-installation Verification This equipment must be installed and wired in accordance with regulations of the National Board of Fire Underwriters, National Electric Code, and local governing bodies. The following recommendations are not intended to supplant any requirements of federal, state, or local codes having jurisdiction. Authorities having jurisdiction should be consulted before installations are made.

  • Page 29: Locating The Unit

    Installation Locating the Unit Prior to locating the unit, authorities having jurisdiction should be consulted before installations are made. Approval permits should be checked against the unit received. If in doubt regarding the application of this appliance, consult the factory. Locate the unit exactly level.

  • Page 30: Roof Curb Installation

    Installation WARNING Do not place unit in a location where service personnel can not safely service the equipment. Failure to maintain proper and safe working conditions could result Serviceability in death or serious injury. Requirements! Note: When selecting a location for these Make-Up Air Units, both the size of the unit and the heating requirements of the building must be considered.

  • Page 31: Inlet Hood Support (By Others)

    Installation 6. To set unit in-place, see rigging procedures in this manual. Seal joints with sealant where necessary. Inlet Hood Support (By Others) • The purpose of the hood support is to support the weight of the unit accessories which are attached to the inlet of the basic unit. •...
  • Page 32 Installation Roof C urb Figure 12. DFOA Roof Curb Models 109-118 Dimensions (feet/inches) Model 10 3/8 "1’ - 3/8 "11 15/16 "11 3/4 "1’ - 10 13/16" 1’ - 1 9/16 "10 13/16 "1’ - 3 15/16 "9 7/8 "1’ - 8 7/8" 1’...
  • Page 33 Installation Figure 13. DFOA Roof Curb Models 215-230 Note: Curb to be shipped loose and assembled in the field. Curb must be square and level. Curb requires intermediate structural support and is not to be corner post mounted. Gaskets to be shipped with unit. Bolting accessories shipped with curb.urb drawings shown are for units which have controls on the "standard"...
  • Page 34 Installation Figure 14. DFOA Roof Curb (Models 109-118) Return Air Downstream of Burner Note 13. Curb to be shipped loose and assembled in the field. Curb must be square and level. Curb requires intermediate structural support and is not to be corner post mounted. Gaskets to be shipped with unit.
  • Page 35 Installation Figure 15. DFOA Roof Curb models 215-230 return air opening downstream of burner Note 14. Curb to be shipped loose and assembled in the field. Curb must be square and level. Curb requires intermediate structural support and is not to be corner post mounted. Gaskets to be shipped with unit.
  • Page 36 Installation Figure 16. DFOA Roof Curb models 109-118 with mixing box Note 15. Curb to be shipped loose and assembled in the field. Curb must be square and level. Curb requires intermediate structural support and is not to be corner post mounted. Gaskets to be shipped with unit.
  • Page 37 Installation Figure 17. DFOA Roof Curb models 215-230 with mixing box Note 16. Curb to be shipped loose and assembled in the field. Curb must be square and level. Curb requires intermediate structural support and is not to be corner post mounted. Gaskets to be shipped with unit.

  • Page 38: Location Of Accessories

    Installation Location of Accessories Where applicable, standard or optional accessories will be placed inside the fan section of the unit for shipment, and must be removed and installed by the mechanical or electrical contractor. Remotely located discharge or inlet dampers must be equipped with an end switch and interlocked to ensure maximum design opening before starting and running circuits may be energized.

  • Page 39: Field Piping

    Installation If optional disconnect is not furnished with the heater, the field provided disconnect must be of the proper size and voltage. Refer to the unit nameplate for minimum circuit ampacity and voltage. The disconnect must be installed in accordance with Article 430 of the current edition of ANSI/NFPA No. 70 National Electrical Code.

  • Page 40: Field Wiring And Remote Control Installation

    Installation Field Wiring and Remote Control Installation Connect the power lines to the line side of the main disconnect switch. 2. Mount and wire remote control panel, thermostats, temperature sensor, and any other field installed controls as indicated on the unit control wiring diagram.
  • Page 41 Installation If gas fork trucks or other fossil fuel powered equipment are utilized in the conditioned area, additional ventilation requirements for the facility must be addressed separately. The heater inlet shall be located in accordance with applicable building code provisions for ventilation air. Field constructed intake accessories should be properly designed to minimize the entry of snow and rain.

  • Page 42: Pre-Start-Up Check List

    Pre-Start-Up Check List Pre Start-up The owners representative or equipment operator should be present during start-up to receive instructions on care and adjustments of the equipment. All equipment has been factory tested, adjusted, metered and inspected to meet conditions set at the time the order was placed. Only minimal adjustments should be required.
  • Page 43 Pre-Start-Up Check List 12. Check that the area around the unit is clear of flammable vapors or containers of flammable liquids. 13. Check that all piping connections, particularly unions, are tight. 14. Check that all accessories requiring field wiring have been properly installed. 15.

  • Page 44: Start-Up

    Start-Up General Start-up Before attempting to start the heater, read and understand the sequence of operations and electrical schematic. Ensure all doors and service panels have been closed or replaced. Turn main disconnect switch off. Check the incoming line voltage to match unit nameplate rating.

  • Page 45: Honeywell™ Flame Safeguard Control

    Start-Up Note: To adjust gas pressure on supply lines where a regulator has been installed (to reduce the inlet pressure to 5 PSIG or less), remove dust cap of main gas regulator and turn adjusting screw clockwise to increase pressure or counterclockwise to decrease pressure. 2.

  • Page 46: Unit Shutdown

    Start-Up 4. Adjust high gas pressure reading (from manometer) to match firing rate shown on unit nameplate first. 5. Refer to control valve adjustment instructions for setting high and low fire gas pressure settings.On systems with pilot, the high fire setting must be made before adjusting low fire.
  • Page 47 Representative ___________________________________________________ Contractor _____________________________________________________ Trane recommends submitting a start-up form for each unit on the job. Basic Factory Warranty is 12-months from the date of shipment without start-up form on file at the factory. With a start-up form, warranty is 12-months from start-up, not to exceed 18-months from date of shipment. In the event that controls are furnished by someone other than the factory, the controls supplier must be represented on the job at the time of the start-up.

  • Page 48: Electrical Requirements

    Electrical Requirements Table 9. Motor electrical data, full load Amps (FLA) Single Phase Three Phase 13.8 16.0 1 1/2 20.0 11.0 10.0 24.0 13.2 12.0 34.0 18.7 17.0 10.6 56.0 30.8 28.0 16.7 15.2 7 1/2 24.2 22.0 11.0 55.0 30.8 28.0 14.0...

  • Page 49: Pre-Installation Check List

    Pre-installation Check List WARNING Product contains fiberglass wool. Disturbing the insulation in this product during installation, maintenance or repair will expose you to airborne particles Fiberglass Wool! of glass wool fibers and ceramic fibers known to the state of California to cause cancer through inhalation.

  • Page 50: Sequence Of Operation

    Sequence of Operation WARNING During installation, testing, servicing and trouble shooting of this product, it may be necessary to work with live electrical components. Have a qualified Live Electrical licensed electrician or other individual who has been properly trained in Components! handling live electrical components perform these tasks.

  • Page 51: Maintenance

    Maintenance Maintenance Schedule Periodic maintenance is essential to the efficient operation and extended service life of the direct fired equipment. Failure to provide maintenance as recommended may void the equipment warranty. WARNING The maintenance and troubleshooting procedures recommended in this section of the manual could result in exposure to electrical, mechanical or other Hazardous Service potential safety hazards.
  • Page 52 Maintenance 3. Quarterly: a. Complete the monthly maintenance schedule. b. Check the belt tension for the main fan(s) and adjust if necessary. c. Check the alignment of the sheaves and adjust if necessary. d. Inspect all bearings, set-screws for tightness and lubricate bearings if necessary.

  • Page 53: Lubrication Requirements

    Maintenance Lubrication Requirements Some blower motors require lubrication while others do not. Those that require lubrication can be identified by the presence of grease plugs in the motor casing at each end. Motors that do not have grease plugs cannot be greased and are lubricated for the life of the motor bearing.

  • Page 54: Frequency Of Lubrication

    Maintenance a higher than normal temperature and noise level. Excessive leakage of grease at the seals, and a high operating temperature suggest too much grease. Frequency of Lubrication Frequency of lubrication depends upon operating conditions. The bearing operating temperature is the best index for determining a relubrication schedule. Table 7 gives the frequency of relubrication based upon continuous operation for various operating temperatures and can be used as a satisfactory guide for determining when all ball and roller bearings should be lubricated.

  • Page 55: Belt Tensions And Adjustments

    Maintenance WARNING Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/tagout Dangerous procedures to ensure the power can not be inadvertently energized. Failure to Voltage! disconnect power before servicing could result in death or serious injury. Belt Tensions and Adjustments Belt tension is adjusted during the initial run-in and test periods at the factory.

  • Page 56: Optional Coils And Related Items

    Maintenance Optional Coils and Related Items Coil surfaces must be kept clean of dirt and lint in order to operate at rated efficiency. Coils should be inspected on a regular basis and cleaned as required. CAUTION Solutions used to clean coils must be non-corrosive to metals or materials in the manufacturing of this equipment.

  • Page 57: Heater

    Maintenance Heater At least a yearly inspection is recommended for heating installations and more frequently for process applications in year-round operation. Experience is the best guide in determining frequency of inspection, but as a minimum, the following procedure should be followed. WARNING Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing.

  • Page 58: Inspection And Maintenance Of Gas Ports

    Maintenance Replace all access panels which have been removed and operate the unit for a test period. 8. Check for normal response and function of all controls. 9. Check all gas piping for possible leaks using a soap bubble solution WARNING Exposure to hazardous gases from fuel substances have been shown to cause cancer, birth defects or other reproductive harm.

  • Page 59: Burner Operating Principles

    Maintenance Burner Operating Principles Fuel gas is fed directly to the make-up air burner. The air stream’s kinetic energy furnishes combustion air. It functions properly at the velocity and pressures associated with usual ventilating systems. The burner operates through a combination of velocity impact and suction generated by the combustion-baffles.
  • Page 60 Maintenance Figure 20. Gas burner section view Gas Manifold 65.0910.28 Flame Rod 71.0201.06 Plan View (Burner Plates Removed) Pin Vise Spark Ignitor 65.0910.28 Pilot Tubing (when required) #45 Drill Gas Manifold Gas Manifold Direct-Fired Make-up Air • MUA-SVX01A-EN...

  • Page 61: Valve Adjustments

    Maintenance Valve Adjustments MR212 Valve - High Fire Manifold Adjustments Disconnect wires from amplifier terminal #4 (Modulating Discharge Temperature-MDT controls), or #2 and #4 (Modulating Room Temperature - MRT controls). This will cause the valve to call for continuous high fire. 2.
  • Page 62 Maintenance M411, 511, 611 Valve - High Fire Manifold Adjustments Disconnect wires from amplifier terminal #4 (MDT controls), or #2 and #4 (MRT controls). This will cause the valve to call for continuous high fire. 2. Adjust the pressure regulator to obtain the desired manifold pressure (7" W.C.

  • Page 63: Trouble Shooting

    Trouble Shooting WARNING The maintenance and troubleshooting procedures recommended in this section of the manual could result in exposure to electrical, mechanical or other Hazardous Service potential safety hazards. Always refer to the safety warnings provided Procedures! throughout the manual concerning these procedures. When possible, disconnect all electrical power including remote disconnects before servicing.

  • Page 64: Connection Of Mrt Controls

    Trouble Shooting MDT/MRT Controls After test, remove the test resistor and reconnect the discharge air sensor to terminals 3 and 4. If remote temperature selector has been moved, return it to its original position. Figure 13, p. 66 for resistance lookup for RTC solutions on the following page.
  • Page 65 Trouble Shooting MDT/MRT Controls 3. Turn test potentiometer slowly to maximum resistance. The DC voltage should gradually increase to at least 18 volts. If proper voltages are observed in both Section 1 and 2, the amplifier is satisfactory. If proper voltages are not observed, continue testing to identify the difficulty.
  • Page 66 Trouble Shooting MDT/MRT Controls Section 4 4. With proper voltages observed thus far, and modulator responding correctly, wire the system (Wire 1 diagram) with exception to -connect the discharge air sensor in place of the jumper. 5. Set the MIN temperature selector on the amplifier at least 10°F above the outdoor temperature.
  • Page 67 Trouble Shooting Flame Relays WARNING The maintenance and trouble shooting procedures recommended in this section of the manual could result in exposure to electrical, mechanical or other Hazardous Service potential safety hazards. Always refer to the safety warnings provided Procedures! throughout this manual concerning these procedures.
  • Page 68 Trouble Shooting flame relays Table 14. Trouble shooting guide for flame relays (continued) Run Period a. No flame present. b. Airflow lockout feature is enabled and the airflow switch opens. c. Interrupted pilot valve terminal is energized (RM7895C/ D,EC7895C, RM7896C/D). d.
  • Page 69 Trouble Shooting Figure 24. Wiring subbase and sequence chart for RM7895A/B, EC7895A, RM7896A/B Q7800 For Direct Spark Ignition (Oil or Gas) Ignition Transformer Line Voltage Alarm Main Valve Blower Motor (Blower) Burner Controller/Limits (See Note 2) Lockout Interlock Including Airflow Sw. Intermittent Pilot Ignition Main Fuel Valve(s) Ignition...
  • Page 70 Trouble Shooting Figure 25. Wiring subbase and sequence chart for RM7895C/D, EC7895C/D, RM7896C/D Q7800 For Direct Spark Ignition (Oil or Gas) Ignition Transformer Line Voltage Alarm Blower Motor (Blower) Main Valve Burner Controller/Limits (See Note 2) Lockout Interlock Including Airflow Sw. 10-Sec.

  • Page 71: Operation

    Trouble Shooting Flame Relays Operation The RM7895, EC7895 and RM7896 has the operating sequence as shown in figures 14 and 15. The LED provides positive visual indication of the program sequence for power, pilot, flame, main and alarm. Initiate The relay module enters the initiate sequence when it is powered. The RM7895A/ B/C/D, EC7895A/C and RM7896A/B/C/D can also enter the initiate sequence if the relay module verifies voltage fluctuations of +10/-15% or frequency fluctuations of ±10% during any part of the operating sequence.

  • Page 72: Ignition Trials

    Trouble Shooting Ignition Trials The pilot flame establishing period (PFEP) begins when: • The pilot valve and ignition transformer, terminals 8 and 10, are energized. The RM7895A/B, EC7895A, and RM7896A/B modules have an intermittent pilot valve, (terminal 8). The RM7895C/D, EC7895C, and RM7896C/D modules have an interrupted pilot valve (terminal 8).
  • Page 73 Trouble Shooting Flame Relays PFEP for the C and D relay modules if terminals 8 and 9, or 9 and 21 are jumpered. Note: When the relay module is switched to the "test" mode, it stops and holds at the next run/test switch point in the operating sequence. Ensure that the run/test switch is in the "run"...

  • Page 74: Settings And Adjustments

    Trouble Shooting Flame Relay Settings and Adjustments The relay module has three site-configurable jumper options. Table 15. Jumper options Jumper # Description Intact Clipped Pilot Flame Establishing Period (PFEP) 10-Sec 4-Sec Flame Failure Action Recycle Lockout Airflow Switch (1LK) Failure Recycle Lockout If necessary, clip the site-configurable jumpers with side cutters and remove the...

  • Page 75: Operation Of The Direct Spark Ignition Control Gas Valve

    Trouble Shooting Gas Control Valve WARNING Maintain proper clearance between the unit heat exchanger, vent surfaces and combustible materials. Refer to unit nameplate and installation instructions for Combustible proper clearances. Improper clearances could result in a fire hazard. Failure to Materials! maintain proper clearances could result in death or serious injury or property damage.

  • Page 76: Check Safety Shutdown Performance

    Trouble Shooting Gas Control Valve – using a screw driver, turn the inner adjustment screw for HI pressure clockwise to increase or counterclockwise to decrease the gas pressure to the burner. 6. After high pressure has been checked, check low pressure regulation. Two stage appliance operating sequences vary.
  • Page 77 Trouble Shooting Gas Control Valve Figure 29. Spark rod diagram 7 1/2” New Flame Rod 71.0213.00 4 1/4” 45° Flame Rod 3” Spark Ignitor Step 1 Opening 71.0213.12 Bend Rod at 45° Angle (3”) From Fitting (Ensure Pilot Tubing Porcelain is not Damaged). (when required) 2”...
  • Page 78 Trouble Shooting The maintenance and troubleshooting procedures recommended WARNINGS in this section of the manual could result in exposure to electrical, Hazardous Service mechanical or other potential safety hazards. Always refer to the Procedures! safety warnings provided throughout this manual concerning these procedures.
  • Page 79 Trouble Shooting Table 16. Trouble shooting guide for systems with pilot (continued) Symptom Probable Cause Solution Motor may be burned or a. Turn power off and check incorrectly wired. motor and wiring. Motor overheating. a. Check burner firing rate. 2. If there is no voltage at HEAT-OFF-ON switch in OFF a.
  • Page 80 Trouble Shooting Table 16. Trouble shooting guide for systems with pilot (continued) Symptom Probable Cause Solution 5. If pilot does not light after Flame safeguard relay run/ a. Place in run position (see prepurge has timed out and test switch in test position or technical cut sheet on flame there is no voltage at flame functioning problem.
  • Page 81 Trouble Shooting Table 16. Trouble shooting guide for systems with pilot (continued) Symptom Probable Cause Solution Photohelic or null switch not a. Check wiring. installed correctly. Temperature control a. Install correctly (see defective. manufacturers cut sheets). Temperature control wired a. Check and/or replace. incorrectly.
  • Page 82 Trouble Shooting on the DFC and measure the voltage across terminals 5 and 6 with a voltmeter. The meter should read between 20 to 24 volts. If it does not, disconnect the wires from the valve and measure the output without the valve connected.
  • Page 83 Trouble Shooting Table 17. Trouble shooting guide for Modulating Discharge Temperature (MDT) Controls Symptom Probable Cause Field Test Solution 1. No gas flow. Modulating valve Arrow on side of valve a. Install improperly installed. should point in direction properly. of gas flow. 2.
  • Page 84 Trouble Shooting Table 17. Trouble shooting guide for Modulating Discharge Temperature (MDT) Controls (continued) Symptom Probable Cause Field Test Solution 5. Incorrect minimum Incorrect by-pass See valve adjustments on a. adjust to fire erratic or pulsating metering valve page 35. proper flame.
  • Page 85 Trouble Shooting Table 17. Trouble shooting guide for Modulating Discharge Temperature (MDT) Controls (continued) Symptom Probable Cause Field Test Solution b. If erratic operation is noted only over a small range of 2 or 3-volts, the voltage sources may contain surges. Consult factory for other solutions.
  • Page 86 Trouble Shooting Table 17. Trouble shooting guide for Modulating Discharge Temperature (MDT) Controls (continued) Symptom Probable Cause Field Test Solution 11. Discharge air Override temperature Check override a. Reset to temperature too low setting is too low. temperature selector of correct when room override remote temperature...
  • Page 87 Trouble Shooting Table 18. Trouble shooting guide for Modulationg Room Temperature (MRT) controls Symptom Probable Cause Field Test Solution 2. Continuous low fire No voltage to the Check for 24V AC at a. Provide 24V (electronics problem). amplifier. amplifier terminals 8 & 9. AC to the amplifier.
  • Page 88 Trouble Shooting Table 18. Trouble shooting guide for Modulationg Room Temperature (MRT) controls Symptom Probable Cause Field Test Solution Excessive negative Close main gas supply, a. If reading is burner pressure. and measure manifold greater than pressure with blower 1.5" negative operating.
  • Page 89 Trouble Shooting Table 18. Trouble shooting guide for Modulationg Room Temperature (MRT) controls Symptom Probable Cause Field Test Solution Short in room sensor/ Remove wires connected a. If reading is selector or room to amplifier terminals 4 & incorrect, temperature sensor/ 5.
  • Page 90 Trouble Shooting Table 18. Trouble shooting guide for Modulationg Room Temperature (MRT) controls Symptom Probable Cause Field Test Solution Incorrect space Follow procedures a. If proper temperature calibration. outlined in “Burner action is Operating Principles,” obtained, first p. 59 check room sensor/ selector.

  • Page 91: Warranty

    1-year coverage through the fifth year. These extended warranties apply only to new equipment installed in domestic Trane Commercial Systems Group sales territories and must be ordered prior to start-up. MUA-SVX01A-EN • Direct-Fired Make-up Air...
  • Page 92 Warranty Direct-Fired Make-up Air • MUA-SVX01A-EN...
  • Page 93 Warranty MUA-SVX01A-EN • Direct-Fired Make-up Air...
  • Page 94 Trane A business of American Standard Companies www.trane.com Trane has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice. For more information, contact your local Trane office or e-mail us at comfort@trane.com...

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