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Direct Fired Air Make-Up Unit - IM-500

1. Aerovent IM 500 August 2013 General Installation Operation and Maintenance Instructions For Aerovent Products Direct Fired Air Make Up Unit Table of Contents Unit Informationen en Ea A 1 Special Precautions Installation Codes Unit Location Restrictions Sound and Vibration Infotmation une 3 Installation INfFOtTMAtION uu Electrical Installation nasiona Gas Piping Installation asini Operating Instructions and Parts Start Up Procedure Sequence of Operation Circuit Analyzetr Troubleshooting essences 15 16 Maintenance Recommendations une 16 18 Terms amp Conditions Wartanty sees 19 21 Start Up Repot hesr aa AER 22 24 FOR YOUR SAFETY If you smell gas 1 Open windows 2 Do not touch electrical switches 3 Extinguish any open flame 4 Immediately call you gas supplier WARNING Improper installation adjustment alteration service or maintenance can cause property damage injury or death Read the installation operating and maintenance in structions thoroughly before installing or servicing this equipment Gas fired appliances are not designed for use in atmo spheres containing flammable vapors or duct or atmo spheres containing chlorinated or halogenated chlori nated or halogenated hydrocarbons Recirculation of room ait may be hazardous in the presence of a flammab
2. Aerovent Part 25941 01 All units are equipped with a Honeywell RM7895C flame safety relay This relay senses if a pilot flame and main burner flame have been established through the use of an ultraviolet UV scanner For more information about the Honeywell flame relay visit the Honeywell web site The flame safeguard relay has a built in component self checking module pre purge timer and an ignition timing flame sensing circuit The pre purge timer allows purg ing of any residual gas or fumes in the unit before a try for ignition Pre purge is approximately 10 seconds After pre purge occurs the spark ignition will start If the pilot flame is not proven within the time period allowed 10 to 25 seconds the relay will go into lockout and it will have to be manually reset before a try for re ignition can occut This can be accomplished by pressing the reset button on the remote station or at the unit thus preventing a trip to the air make up unit If after several 2 3 tries the unit won t light off have a maintenance man inspect the unit to determine cause of relay lockout Note The power light will blink this is a normal operating condition Figure 5 Flame Relay C7027 Ultra Violet Scanners Aerovent Part 2281 01E Units are equipped with a C7027A UV scannet This device is shipped removed from the flame sighting tube to prevent damage during shipment Unwrap the device and mount on the sighting tube The UV scanner is
3. Figure 12 and turn regulator pres sure adjusting screw to obtain desired manifold pressure 7 in wc MAXIMUM Clockwise rotation increases pressure The manifold pressure must not exceed 7 in w c The flame must always be checked visually The Aerovent IM 500 flame MUST be a clean blue flame A little yellow tipping is acceptable but the flame should be blue The flame length should be a maximum of 10 12 in 3 Reconnect the wires to terminals 4 Low Fire or By Pass Adjustment 1 Disconnect wire from terminal 8 on the A1044 or A1014 Amplifier This causes valve to call for continu ous low fire 2 Remove cap B Figure 12 and loosen lock screw C Turn D to desired low fire adjustment Clockwise rotation reduces minimum flow rate Flame should be stable over full length of burner 3 Tighten set screw C replace cap B and reconnect wire to terminal 8 NOTE This procedure is in the Maxitrol bulletin found at www maxitrtol com Please consult it for further information Blocking Main Gas and Vent Valve Systems for FM and or IRI Insurance Requirements To meet the national insurance requirements of FM Factory Mutual or IRI Industrial Risk Insurers these controls are furnished in addition to the gas controls required by ANSI Motorized Main Gas Valve s FM and IRI and some local codes require the use of one ot two motorized main gas shut off valves and depends on the BTU input capacity of th
4. combination method of process in which or in the manufacture or testing of which any such product may be used not withstanding that such product may have been designed only for use in or may be useful in such other patented product or such patented equipment assembly combination method or process or in the manufacturing or testing thereof and that such product may have been purchased by Buyer and sold by Seller for such use This covenant by Seller is upon the condition that Buyer shall give Seller a prompt notice in writing of such suit or infringement full opportunity to conduct the defense thereof and full assistance and cooperation in said defense No cost or expense shall be incurred for the account Aerovent IM 500 22 of Seller without its written consent When Buyer orders articles Buyer is licensed to have made for Buyer Seller is hereby authorized to manufacture said articles under Buyet s license and Buyer will be responsible for such royalties as may be due and for such notification to its licensor as Buyer is obligated to make 12 CHANGES After acceptance by Seller Buyer order shall not be subject to cancellation change ot reduction in amount not to any suspension by Buyer of deliveries without Seller s prior written consent Buyer acknowledges that Seller engages in continuous product improvement and makes changes to its products from time to time The Seller reserves the tight to make reasonable changes and use subs
5. 21 Check to make sure the flame sensor and flame safe guard relay is operating correctly To check shut off the pilot gas hand valve while the pilot is still on The pilot igniter should try for ignition within 2 to 4 sec onds If pilot cannot be reestablished the flame safe guard control should go into lockout If the flame safeguard does not go into lockout contact factory 22 Turn the pilot gas hand cock to the on position and reset the flame safeguard relay using the manual reset button on the relay Allow the unit to establish pilot 23 Check the airflow sensing device switch by blocking off 30 of the inlet to the unit The system should shut down With the pilot established increase the pressure setting of the airflow proving switch by turn ing the adjustment screw on the switch clockwise Increase the setting until the pilot drops out Back off of this setting two turns enough to allow the pilot to reignite If pilot does not drop out during this check inspect the switch for damage and replace if required 24 Check continuity of limit control contacts and wiring Unit will not try for ignition if limit control is faulty The high limit control is factory set and does not require field adjustment NOTE THE MAXIMUM GAS PRESSURE GAS MANIFOLD CAN SAFELY HANDLE WITHOUT DAMAGING THE CONTROLS IS 5 PSI 25 Open main gas cock and check gauge gas pressure reading The pressure reading on the gauge should be at factory
6. 6 Make final unit connections to the electric power supply and remote control circuits Connect gas lines NOTE Blow lines clean of shavings and sealant before connecting to the unit pipe train strainers are recom mended between gas supply lines and manifold pipe train Caulk all utility clearance holes and seams on the unit after connections have been made If the unit is to be rail or slab mounted use similar direc tions as noted in this installation section Slab Mounted Units For ground level installation of unit prepare a level con crete slab at least 4 thick and extending 6 inches beyond the unit on an adequate footing and a generous bed of gravel for proper drainage The slab should include thread ed anchor bolts to fit mounting holes and spaced according to unit mounting dimension per unit drawings for securing the unit in place The anchor bolts should extend at least 2 above surface of the mounting slab to allow clearance for mounting washers and nuts bolts mounting washers and nuts by others Other Notes Units are not always shipped in one piece Some field assembly is typically required Hardware is included sealant and gaskets are not in all cases FCBT units include a seal ing tape for the flanges ALL others units do not include any sealants Please contact your local representative for the breakdown of the number of pieces prior to shipping Aerovent ships units in the most economical way Should it be de
7. RM7895 relay terminals Burner observation and adjustments Reference Maxitrol operating description on page 9 Adj Hi Fire Burner pressure reading ___ w c Adj Lo Fire Does entire burner exhibit flame Yes ___No Is flame clean and stable ___ Yes ___ No Review Maxitrol bulletin for adj high and low fire Flame safeguard functioning correctly Time required to go into lockout ___ Seconds 36 Mild weather control cycled and reset to proper setting 65 F 37 Air flow proving switch cycled for functionality by blocking off 3 of system inlet 38 High temperature limit control cycled for test by lowering set point checked for functionality required manual reset 39 Low temperature limit amp timer Set low limit above the ambient temperature Set timer to 1 minute Unit should shut down after timer times out After shut down reset timer to 3 minutes Reset unit and restart 40 Does flame modulate in response to temperature set point changes 41 Recirculating Systems ONLY Burner by pass and return air damper operating correctly when setting changes on rheostat or static pressure sensing device dampers should modulate to new position and maintain stability 42 Do all dampers return to closed position with power interruption On recirculation system return air open outside air closed USE BACK OF REPORT FOR COMMENTS DATE OF INSTALLATION Name address and phone number of company doing installation Techn
8. defective 2 Contacts and setting of mild weather thermostat 3 Ambient temp above MW setting If lamp 8 does not light check 1 Is lamp 8 getting power or is the bulb defective 2 Selector in summer position 3 Continuity between 7 and 8 on the selector switch If lamp 9 does not light check 1 Is lamp 9 getting power or is the bulb defective 2 Line gas pressure 3 Low gas pressure switch Manual reset If lamp 10 does not light check 1 Is lamp 10 getting power or is the bulb defective 2 High gas pressure switch Manual reset Aerovent IM 500 If lamp 11 does not light check 1 Is lamp 11 getting power or is the bulb defective 2 High temperature limit thermostat Manual reset 3 Not properly set If lamp 12 does not light check 1 Is lamp 12 getting power or is the bulb defective 2 Airflow switch adjustment 3 Dirty filters or loose belts If lamps 13 amp 14 do not light check 1 Are lamps 13 and 14 getting power or are the bulbs defective 2 Reset button on the RM7890 flame relay 3 Connection of the wire 13 to terminal 10 on the flame relay and wire 14 to terminal 8 4 C7027A flame sensor Remove from the sighting tube and observe UV tube during new sequence If it lights bright orange or flickers when fan starts it is defective Replace It should flicker when it sees a flame If it glows solid replace 5 If it does not flicker occasio
9. of lading or other appropriate shipping documents covering each shipment All costs of collection shall be borne by Buyer If shipment or delivery is delayed by Buyer payment shall be due when Seller is ready to make the shipment or delivery Unless otherwise set forth on the face of the Agreement all payments shall be made in U S Dollars If Buyer fails to fulfill the terms of payment or if Seller shall have any doubt at any time as to Buyer s financial condition Seller may decline to make further deliveries except upon prompt receipt of cash or satisfactory security as decided by Seller This requirement will not release Buyer from any previous obligation Seller s right under this Section shall be in addition to all other rights and remedies available to Seller upon Buyers default In addition if reasonably requested by Seller Buyer shall establish an irrevocable letter of credit in favor of Seller in an amount sufficient to cover the price of products and all related expenses which are for Buyer s account and which includes such other terms and conditions and issued or confirmed by a US bank as may be acceptable to Seller 4 ORDERS No order shall be valid until accepted by Seller at its office in Minneapolis Minnesota U S A 5 FORCE MAJEURE Seller shall not be liable for any delays in the delivery of orders or any other failure to perform due in whole or in part directly or indirectly to fire storm flood earthquake war insur
10. on pressure in the building will tend to become mote negative The building pressure switch senses this change in pressure and causes the floating damper motor to adjust its position to bring the building pressure back to near atmospheric by intro ducing more outside air and reducing the amount of return ait supplied to the unit The dampers can be adjusted for a maximum of 100 outside ait and a minimum of 20 outside air When power is interrupted to the motors the return air damper closes and the profile damper opens The discharge damper closes also giving a 100 shut off from outside air CAUTION The building pressure control s low pressure tap MUST be vented to the outdoors and fitted with a wind and rain shield The desired building pressure is maintained by adjusting the pressure set point on the floating pressure switch The differential is adjusted by the null adjustment in the pres sute switch The smaller the null zone the mote sensitive the setting The larger the null zone the less sensitive the setting Settings should be such that the dampers stabilize and hunting of the damper motors does not occur The larger the null zone the more stable the control loop will be Reset Timer Aerovent Part 21749 01 Timed bypass of the low temperature switch A timed freeze protection system is supplied with most units This system includes a reset timer and a discharge air tempera ture sensor freeze stat On initial st
11. opened 6 After pilot is lit and proven the main gas valves are ener gized and the burner fires at low fire The burner On light is energized on the remote panel when the main valves are completely open and the end switch is made 7 Burner remains on low fire until the main valves are 100 open and the end switch is made The tempera ture controls then take over and modulate burner firing based on load demands NOTE If the unit has been supplied with a dirty filter switch the filter light will come on if the pressure drop across the filters becomes excessive If a flame failure should occur lock out time 17 sec onds the burner light on the remote panel will go out The flame safeguard relay will go into lockout The unit selector switch must be turned off before the unit can be restarted again The flame safeguard reset button optionally located on the remote station must be manually reset in order to restart the burner If you have a remote reset travel to the unit is not required CAUTION After resetting the reset button on the flame safeguard relay three times and the unit fails to light off have service department check unit to determine cause of failure Using the Circuit Analyzer to Isolate Defective Components Troubleshooting the Aerovent ait make up control systems has been simplified by the use of the circuit analyzer The light numbers are the same as the wite numbers for each circuit They are also ar
12. provides extreme accu racy and rapid response to small temperature changes Compensates for process heat while maintaining the room temperature Go to the Maxitrol web site at www maxitrol com for the Maxitrol bulletin that pertains to the system supplied with your unit The front specification page lists the type of temperature control system Maxitrol Temperature Control Modulating Gas Valves MR212 valve Units are supplied with a Maxitrol Series 14 or 44 tempera ture control modulating system The Maxitrol temperature control responds to a DC voltage signal from the Maxitrol Series 14 or 44 amplifier When the DC voltage is in the range of 0 to 5 volts the main valve is at low fire modulates between 5 and 15 VDC at 15 volts the valve is full open and is at high fire operation As the DC voltage changes a solenoid valve in the main valve modulates Low fire is accomplished by means of a mechanical bypass built into the valve body This adjustment is located under the valve covet and should be adjusted on all installation start ups Figure 11 MR212 Valve Maxitrol Modulating Valve Adjustment NOTE Low fire adjustment should be checked whenever the high fire adjustment is changed Figure 12 i MIS TCE MAMI Lila Valve ie High Fire Manifold Adjustments 1 Disconnect wires from terminals 2 and 4 on the A1044 or 4 on A1014 Amplifier This causes the valve to call for continuous high fire 2 Remove seal cap A
13. vent valve is a normally open solenoid type valve This valve is normally open when the unit is not operating It vents the pipe connecting the two safety shut off valves to the outdoors The vent valve should be checked for proper operation at least once a year at the beginning of the heating season Obviously if this valve should fail large quantities of fuel would be wasted as this would be bypassed to the outside The purpose of the vent valve is to divert the gas flow to the outdoors in the event the first motorized valve fails to close during a shut down operating condition Aerovent IM 500 12 Figure 15 Vent Valve Building Pressure Controls Optional When units are provided with an 80 20 recirculating fea ture a separate outside air and return ait damper control is supplied with the unit The control includes a floating pressure switch Units utilizing a building pressure control are provided with an outside air burner bypass damper and a return air damper The outside ait burner bypass damper and return air damp er ate controlled by a floating damper motors The dampers are connected to the motor by a damper linkage Figure 16 Floating Pressure Switch The purpose of the building pressure switch is to sense the difference between the indoor building pressure and outdoor atmospheric pressure This system is used when varying exhaust loads are handled by one make up ait unit As more exhaust fans are turned
14. 5 feet of piping between any high pres sure regulator and the unit control pipe train Gas Supply Pressure 5 Ibs or less The Aerovent air make up unit is standardly furnished with the Maxitrol modulating system This device controls the firing rate of the burner to maintain the desired operating temperature It functions as a regulator and modulator which will not allow the burner manifold pressure to exceed that which produces the maximum firing rate and also will reduce the pressure below this value to modulate the burner through out the normal 25 to 1 turn down ratio The upstream pressure supplied to the unit pipe train must not exceed 5 pounds This is the maximum for suitable operation The minimum operating pressure will vary depending upon the unit size and pipe train size This pressure is marked on the pressure gauge As long as the gas pressure supplied to the unit is maintained at some value between the minimum as marked on the gauge and 5 pounds maximum the air make up unit will perform at its rated capacity If the gas supply system is designed for a pressure higher than 5 pounds it is necessary to install an additional regulator upstream of the connection to the unit See fol lowing instructions for gas supply over 5 pounds The downstream pressure from the line regulator will vaty somewhat depending upon the firing rate of the air make up unit Variations can also be caused by other gas equipment connected to the distr
15. Airflow Switch EXAMPLE Low limit opens during operation or remains open on initial start up due to insufficient heat Manually reset the unit by turning the selector switch to OFF then back ON AIl other controls will require manual reset at the control except the airflow switch Notes Usually nuisance shut downs are one of two things a Low temperature limit The unit shuts down as soon as the reset timer times out b Air Flow Switch Typically these are periodic shut downs and do not happen predictably FOR TROUBLE SHOOTING TEMPERATURE CONTROLS CONSULT THE MAXITROL BULLETIN FOUND AT WWW MAXITROL COM Annual Maintenance Recommendations MAINTENANCE SCHEDULING Prior to heating season each year the following inspections and tests should be made to be sure the unit is in proper operating condition for the heating season Turn off power at the main disconnect switch Examine the inside of the air make up unit See that the thermostat and temperature sensing elements are in place and their support brackets are solid Examine the damper blades and linkage to insure that they have not been damaged Turn the propeller by hand to be sure the bearings turn freely with no tough spots or noise Be sure the grease lines and fittings are intact Check the velocity monitor to be sure the venturi and the tubing to the airflow switch are not obstructed BLOWER ASSEMBLY The blower assembly includes the fan bearings drive sh
16. I NFPA 70 LATEST EDITION UNIT MUST BE ELECTRICALLY GROUNDED IN CONFORMANCE TO THIS CODE ANY WIRING DIFFERENT FROM WIRING DIAGRAM SUPPLIED SHOULD BE CLEARED WITH FACTORY ENGINEERING WITH WRITTEN APPROVAL FOR VALIDATION OF UNIT WARRANTY Any damage to or failure of this equipment caused by incorrect wiring of the unit is not covered under the stan dard product warranty Electrical wiring diagrams are furnished with each unit and can be found in the O amp M manual and a permanent laminated diagram is located on the inside of the electric control cabinet door All units are supplied with a labeled terminal strip for ease of wiring The power supply to the standard unit is be protected with a lockable type fused disconnect switch If a discon nect switch is not supplied with the unit the field supplied disconnect must have adequate ampacity and must be installed in accordance with Article 430 of the National Electrical Code ANSI NFPA 70 External electrical service connections which must be made include 1 Main power supply to unit 120 208 240 480 or 575 volt 2 Remote control panel Consult unit wiring diagram 3 Separate 120V service for lighting and receptacles as required 4 Control wires connected to the remote temperature selector must not be run close to or inside conduit with power or ignition wires Doing so may cause the unit to function erratically or may destroy the amplifier If shielded wites are used shiel
17. T TO ANY WARRANTY EXPRESSED OR IMPLIED WHETHER STATUTORY OR OTHERWISE INCLUDING ANY WARRANTY OF MERCHANTABILITY INFRINGEMENT OR FITNESS FOR A PARTICULAR PURPOSE MADE IN CONNECTION WITH ANY CONTRACT FORMED HEREUNDER BUYER AGREES THAT SUCH FAILURE TO PAY SHALL CONSTITUTE A VOLUNTARY WAIVER OF ANY AND ALL SUCH WARRANTIES ARISING PURSUANT TO SUCH CONTRACT Seller makes no other warranties of any kind and any repair or attempt to repair products by anyone other than an authorized representative of Seller automatically voids any warranty of those products Any oral or written statement concerning the products inconsistent with the warranty contained herein shall be of no force ot effect 9 LIMITATIONS ON LIABILITY Under no circumstances shall Seller by liable for any indirect consequential collat eral special or incidental damages including without limitation increased manufacturing costs loss of profits or goodwill whether such claim is based on contract negligence strict tort warranty or any other basis Seller liability shall in no event exceed the purchase price of the particular products with respect to which a claim is made Tools dies and other equipment furnished to Seller by Buyer shall be at Buyet s risk and expense Seller does not insure Buyer under any of its insurance poli cies including liability or workers compensation Seller will not provide Buyer with indemnification for any matter nor does Seller agree to prov
18. a ultra violet light sensing device It takes advantage of the fact that a flame will emit some of its light in the low frequency ultra violet light range The scanner uses an electronic eye to scan for the presence of this ultra violet light If flame is detected it sends this signal to the RM7895C flame relay Figure 6 UV Flame Detector Purple Peeper Gas Pipe Train Configuration Aerovent Part 2281 01E The type of manifold supplied with the unit varies depend ing on whether the unit was ordered with a FM or IRI manifold To determine which arrangement was supplied with the unit see the manifold descriptions noted on the product specification and general description page in the front of this manual Figure 7 FM Piping sl n i ni T i ra 7 Na Ii ra ali FTT Ay ir ANNALI i Fr ei l Cia ry 5 Figure 8 IRI Piping STi WE 4 TE s on ovis Pilot Solenoid Gas Valve Aerovent Part 422 05E The pilot solenoid gas valve serves as a separate shut off valve for the pilot gas during normal operation and pro vides means for interrupted pilot and main flame supervi sion during normal operation of the unit Figure 9 Pilot Valve Aerovent IM 500 Adjustable Pilot Aerovent Part 1192 01E The pilot is properly adjusted at the factory however the conditions of the installation can affect this pre adjusted pilot so that it may require resetting The pilot has a needle valve adju
19. agreement shall be binding and shall inure to the benefit of the successors and assigns of the entire business and good will of either Seller or Buyer or of that part of the business of either used in the performance of this Agreement but shall not be otherwise assignable 16 MODIFICATION OF STANDARD TERMS AND CONDITIONS No addition to or modification of any of the provisions upon the face or reverse of this form shall be binding upon Seller unless made in writing and signed by a duly authorized employee of Seller 17 ARBITRATION Buyer agtees that all claims demands disputes controversies and differences arising under any con tract made hereunder shall be settled exclusively in arbitration in accordance with the rules then prevailing of the American Arbitration Association Upon prevailing in any such arbitration Seller shall be entitled to an award of its costs and attorneys fees Judgment on the award thus rendered shall be binding on the Buyer and may be entered in any court having jurisdiction thereof Unless the parties agree otherwise in writing such arbitration will be conducted in Minneapolis Minnesota U S A 18 EXPORT REGULATIONS PERMITS Buyer will comply with the provisions of the United States Government s Export Administration regulations and related documentation requirements and internal control procedures Buyer shall be responsible for obtaining any necessary export or import licenses and permits 19 APPLICABLE LAW T
20. and are subject to receipt of all necessary Buyer information letter of credit if required and all necessary licenses permits and other documents 7 INSPECTION AND ACCEPTANCE Buyer must inspect delivered products and report claims for damages or short ages in writing within ten 10 days of delivery or the products shall be deemed irrevocably accepted and such claims be deemed waived Aerovent IM 500 21 8 LIMITED WARRANTY AND REMEDIES Seller warrants to the original purchaser that the products sold hereunder shall be free from defects in workmanship and material upon delivery under normal use and service except in those cases where the materials are supplied by Buyer The liability of Seller under this warranty is limited to replacing repairing or issu ing credit at cost FOB factory and at Seller s discretion for any part or parts which are returned by Buyer within one year from the date of original installation or eighteen 18 months from the date of shipment whichever occurs first provided that a Seller is notified in writing within ten 10 days following discovery of such defects by Buyer or within ten 10 days after such defects should reasonably have been discovered whichever is less b the defective unit is returned to Seller trans portation charges prepaid by Buyer c payment in full has been received by Seller for said products d Sellet s examination of such unit shall disclose to its satisfactory that suc
21. art up the reset timer allows the unit to go through the normal ignition sequence The reset timer is set to engage the discharge air sensor after a period of 3 minutes In the event the unit fails to fire after this time period the discharge air sensor will sense the cold air and will shut down the entire unit This is done to prevent freeze up of water lines and minimize discomfort to personnel in the area Figure 17 Reset Timer Aerovent IM 500 Mild Temperature Control Aerovent Part 1175 01E A mild weather temperature stat is supplied with most units The purpose of the mild temperature stat is to shut the main burner down 100 during mild weather days so undesirable temperature build up in the space will not occur This device is normally set at 60 65 F Adjustable Figure 18 Mild Weather Control Damper Motor Aerovent Part 26758 02 or 26758 20 The damper is operated with a rotary spring return damper motor capable of 133 in Ibs of torque Full opening of the motor requires 120 seconds An internal adjustable auxiliary switch set at 65 open closes and allows the starter to pull in and start the fan On power interrupt the motor is driven closed by the spring return device Figure 19 Damper Motor Start Up Procedure and Check List After the unit has been installed and the preliminary checks have been made the following start up procedure must be performed Regulators are shipped separately
22. ated Turn the unit on in the Winter position and observe its operation on the circuit analyzer If it is a warm day it will be necessary to increase the setting of the mild weather thermostat in order to get the unit to fire Watch the burner when it first lights It should light off with a low flame then increase in size and stabilize out somewhere in between This would indicate that the modulating system is working 11 If you have cleaned the burner plates or if the burner plates are dusty there will be a lot of color in the flame and luminous particles will be present These will dis appear after the burner operates for a while If the unit fails to operate refer to the section on trouble shooting and analyze the problem After you are satisfied with the checkout be sure to set the mild weather control to the desired heat off temperature This is usually 60 to 65 GAS AND ELECTRIC CONTROLS Inspect for general cleanliness and tightness of electric and mechanical connections Check gas valves a minimum of once pet year for tightness of the safety shut off valves using the leak test ports on the valves Aerovent IM 500 CARE OF HEATER FOR EXTENDED SHUTDOWN 3 If the unit is supplied with filters remove and store PERIODS filters If the unit is to be shut down for an extended period of 4 Protect outside air opening to prevent the unit from time the following precautions should be followed being soiled 1 Turn o
23. bustible material shall not exceed 90 F above an ambient temperature of 77 E 10 Do not block or modify combustion or ventilation air openings Installation must conform to all local codes ot in the absence of local codes with National Fuel Gas Code ANSI Z223 1 latest edition in Canada install according to CAN CGA B149 Installation Code for Gas Burning Appliances and Equipment or CAN CGA B149 2 Installation Code for Propane Burning Appliances and Equipment 11 Do not operate unit without exhaust fan or fans oper ating Insure proper interlock with exhaust fan system Direct fired units operate by heating air directly when the air is passed over the burner flame On initial burn er start up or on burner shut down some gas odor may be detected The presence of gas odors under these temporary intermittent conditions does not indicate an equipment problem nor do they indicate a hazardous or unsafe operating condition Direct fired equipment is not recommended for installations that may be high ly sensitive to temporary gas odors If gas odors persist after initial burner ignition or for extended periods after burner shut down discontinue use of unit and call a qualified service technician 12 Installation in airplane hangars must be in accordance with the Standard for Aircraft Hangars ANSI NFPA 409 and in public garages in accordance with the Standard for Parking Structures ANSI NFPA 13 Use spreader bars when lifti
24. ch in the Off position the unit is shut down and either the blower or burner will operate Aerovent IM 500 Remote Switch in Summer Position With the remote switch in the Summer position the fol lowing sequence of operation will occur 1 Inlet and or discharge damper is energized 2 When damper is 65 open the internal damper motor end switch will make and allow power to be supplied to the motor or motor starter Fan will start and supply air to the distribution system The blower light will come on 3 The gas controls and temperature controls are locked out to prevent heating during the Summer mode Note The burner will not come on with the switch in Summer The fan will continue to run as the temperature drops Remote Switch in Winter Position If freeze protection is furnished with the unit the freeze protection timer will be energized at this time to provide power to the inlet and or discharge dampet With the remote switch in the Winter position the above sequence continues 4 The running interlocks supply power to the flame relay through contacts on high temperature limit control and high and low gas pressure switches mild weather tem perature stat proof of airflow switch proof of closure switch and freeze protection sensor 5 After 7 seconds of pre purge time the flame safeguard ignition sequence is energized the ignition transformer is energized and pilot valve is
25. checked and reset if necessary turn the temperature controls down to their lowest setting and recheck the low fire burner flame It should still be stable and burning clean Aerovent IM 500 NOTE RECOMMENDED FREQUENCY OF TEST IS ONCE PER MONTH 32 Safety shut off valve leak test Remove cap from test cock Close the manual valve on the vent line The main S S and blocking valves are closed Open the test cock check for gas leak If no leak detected close test cock and cap Open the manual valve in the vent line 33 Check gas input rate Actual input rate should be checked and necessary adjustments made after the unit is installed Over firing a gas pressure result of too high an input reduces the life of the unit increases maintenance lowers burner efficiency and can result in poor combustion Under no circumstance should the input exceed that shown on the unit specifica tion description The following procedure describes how the gas input check is accomplished Pressure Method The pressure method determines input by measuring the pressure of the gas in the burner manifold in inches of water Designed for 7 in wc MAXIMUM 1 Close manual valve 2 Remove the s pipe plug test port at the burner and attach water manometer of U tube which is at least 12 high or pressure gauge calibration with a range of 0 to 15 in we Open manual valve and start unit 4 If pressure as indicated by U tube or gau
26. ck to make sure that all filters are in place and they are installed properly with arrows pointing in the direc tion of air flow 8 Perform a visual inspection of the unit to make sure no damage has occurred during installation Make sure all service doors have been closed 9 With the Summer Off Winter switch still in the Off position energize the electric supply to the unit with the power disconnect switch 10 Move the Summer Off Winter switch to the Summer position The inlet and or discharge air dampers should open approximately 120 seconds When in the 65 open position the damper end switch should make and allow the blower motor starter to be energized Aerovent IM 500 11 Turn unit off IMMEDIATELY and check the blower for proper rotation of wheel Correct if required by reversing two of the three leads supplying power from the starter If soft start or VFD is installed consult the instruction manual that was included with the unit to change rotation 12 Turn unit back on and check to make sure that the damper opens fully without binding also check the motor and blower speed with the strobe for rpm 13 With the voltmeter check motor voltage on all three phas es of the systems to make sure all legs are in balance 14 With the amp meter check motor amp draw to make sute it does not exceed the motor nameplate rating On three phase systems check all legs to insure system is balanced NOTE The first main
27. d Considerations CAUTION Units must not be installed where they may be exposed to explosive or flammable atmospheres In Canada only 100 make up air direct fired units may be installed and they must be applied solely for replacing exhausted inside air with heated outside air 1 Do not locate any gas fired equipment where chlori nated or acid vapors are present in the combustion air atmosphere 2 When locating units consider general space and heat ing requirements and availability of gas and electrical supply 3 Maintain minimum clearances to combustibles The minimum clearances are 12 from the top 12 from the bottom 12 from the sides and 12 from the ends 4 Where necessary to provide working clearance beneath the unit the unit shall be installed at a suitable height above the floor or otherwise adequately protected 5 Allow 36 clearance on both sides of the unit for ser vice access 6 Do not modify or block combustion or ventilation openings Do not modify burner profile opening 7 Do not install direct fired units down stream from any cooling system that utilizes refrigerants for cooling 8 Be sure the structural support at the unit location is adequate to support the weight of the unit 9 Units require field support of the accessory filters and inlet hood 10 Some models may be split shipped to accommodate maximum shipping widths When assembling unit sec tions make sure that the sections are pr
28. d above utility areas corridors restrooms and other non critical areas Generally a unit should be located within 15 feet of a primary support beam Smaller deflections mean less vibration and noise transmission Field installed factory supplied vibration iso lators are available for suspended or rail slab mounted units Internal factory mounted blow er and motor isolation may be ordered as an option at the time the unit is ordered Installation Duct Connections To assure proper airflow from the discharge of the unit follow these recommendations 1 Be sure properly sized and designed discharge ducts ate installed Velocities should be selected from 2 000 ft min to no more than 3 000 ft min for optimum effi ciency of operation 2 Units should have a common discharge plenum of at least three 3 hydraulic duct diameters 3 As a general rule all discharge ducts should have a straight run of at least three 3 hydraulic duct diameters before making turns in the ductwork Hydraulic Duct Diameter for Rectangular Ducts Dh 4A P Hydraulic Duct Diameter for Circular Ducts Dh D Where Dh Hydraulic Diameter A Cross Sectional Area of Rect Duct P Perimeter of Rectangular Duct D Diameter of Round Cut Aerovent IM 500 Return ducts should be designed in the same manner Where ductwork or other enclosure is installed to the inlet or outlet of the unit in such a way as to cause a possible gas trap and accumulat
29. d must be insulated and grounded at the amplifier location only Supply voltage must be within 10 percent of the power rat ing with each phase balanced to within 2 percent of each other If not advise the power company Before powering unit make sure all multi voltage components transformers motors etc are wired in accordance with the correct supply voltage The lighting circuits and unit receptacles require the installation contractor to supply a separate 120 volt single supply source to the unit and be installed in accordance with Article 210 of the National Electrical Code ANSI NFPA 70 1987 Gas Piping Installation CAUTION Gas pressure to main gas manifold must NEVER EXCEED 5 psi The unit and its individual shutoff valve s must be disconnected from the gas supply during any pressure testing of the piping system Before assembling piping to unit manifold contractor should be sure all rust piping compound and shavings have been removed from new piping Strainers are recommended between unit pipe train and supply piping Always check the unit s data form to determine the cor rect gas supply pressure for which the unit was designed Installation of piping must be in accordance with local codes and ANSI Z223 1 latest edition National Fuel Gas Code In Canada CAN CGA B149 Code 2 Piping to units must conform to local and national requirements for type and volume of gas handled and pressure drop a
30. d of the unit The accessory lifting eyes should only be used to steady the load The main load should be placed on the unit s lifting lugs The unit lifting lugs are supplied at the top of the Aerovent units and provide maximum strength for lifting In order to lift the unit without damaging the case SPREADER BARS MUST BE USED A bead of caulking must be applied to the face of all flanges just prior to mounting and bolting Then bead should be applied to outside seams after installation CAULKING IS NOT SUPPLIED WITH THE UNIT Unit Installation Follow the site preparation instructions for applicable cutb tail or slab mounted as noted in this section of the manual Check the nameplate of the unit before lifting to insure that the model and serial number shown matches that shown on the shipping papers Check unit dimensions and mounting holes prior to installation to ensure smooth installation experience If the unit is mounted on a factory supplied curb 1 Install roof curb using roof curb instructions as noted in this section of the manual 2 Thoroughly clean and dry the top of the curb surface 3 Attach a curb gasket around the top perimeter of the curb 4 Lift the unit into place and set the unit down evenly on curb Check to make sure unit is level and is firmly seated on all corners of the curb 5 If units are supplied with accessories for field mount ing attach all accessories after the unit has been set in place
31. e burner The motorized gas valve contains a heavy duty spring which will return the valve to the closed position if power is interrupted to the valve The valve uses a hydraulic pump to open the valve The use of self closing heavy duty return springs provides a positive shut off in the event of a power loss to the valve A second blocking valve prevents gas escaping into any occupied space should the main gas valve not provide tight shut off when the unit is shut down Figure 13 Valve Actuator and Gas Valve High Low Gas Pressure Switch FM IRI Aerovent Part 470 01E A high and low gas pressure switch is included with all units These switches monitor the gas pressure downstream from the safety valves and shuts off the electric supply to the safety valves if excessive or insufficient gas pressure is experienced This will shut down all gas flow to the burner The switches must be manually reset when the gas pressure is returned to the set point pressure of the respective pres sure switches Figure 14 High Low Gas Pressure Switch RELET WI TUHEG Normally Open Vent Valve CAUTION Units mounted indoors and supplied with a vent valve MUST have the vent valve vented to the outdoors Venting of the valve is the responsibility of the installer Normally two motorized main gas valves are supplied and an open vent valve is also supplied between the two valves The vent valve MUST BE VENTED TO THE OUTDOORS The ASCO
32. eaves and belts Bearings should be checked for any unusual wear and replaced if needed Also make sure beatings are secure and locking collars tight Check the belt drive for proper tightness and align ment If belts are beginning to wear replace them If the sheaves show signs of wear in the grooves replace both fan and motor sheaves and the belts New belts should be retightened after 24 hours of operating and again after a week s operation Aerovent IM 500 LUBRICATION INSTRUCTIONS FOR FANS AND BLOWERS Bearings and grease lines on fans are lubricated on assembly When lubrication is required add grease slowly while shaft is rotating until grease comes rapidly out of the relief port on the fitting For extreme conditions lubricate according to experience Check lubrication table in Aerovent IM 100 for frequency recommendations LUBRICATING DOOR HINGES Door hinges should be lubricated on a monthly basis even though they are stainless steel to keep hinges from freez ing up due to lack of use Apply oil at the hinge and work the oil in by opening and closing the door several times LUBRICATION INSTRUCTIONS FOR MOTOR Grease lubricated beatings as furnished are adequate for a long period of operation without relubrication A good maintenance schedule for regreasing will vary depending on motor size speed duty and environment See lubrica tion table in IM 100 The table suggests relubrication intervals for motors on no
33. erly filled out and signed by the installer It then is to be mailed or faxed back to Aerovent 800 S High St Covington OH 45318 The fax number is 937 473 3793 Before continuing with the start up and checkout proce dure it is important to familiarize yourself with the safety controls furnished with the unit Airflow Proving Switch Aerovent Part 19240 01 The airflow proving switch monitors the differential pres sure across the venturi sensor located at the burner profile plate to insure that sufficient airflow exists before allowing the burner to operate The airflow proving switch is located in the gas controls cabinet and is electrically interlocked with the flame safeguard control system The air flow venturi is located at the burner profile plate with pressure taps leading from that location to the pressure switch The venturi amplifies the signal to the pressure sensing device and minimizes nuisance shutdowns High Temperature Limit Control Aerovent Part 18756 01E The high temperature limit control shuts down the burner if excessive discharge temperatures are experienced The limit control is located in the blower discharge air chamber The limit control is electrically interlocked with the flame safeguard control relay Figure 3 AIRFLOW SWITCH Del Wii Taree AIR FLOW VENTURI dettero i fa Pa ne Figure 4 High Temperature Limit Paul Sv fit Aerovent IM 500 Flame Safeguard Control
34. ff all manual shutoff valve s at the unit and in 5 Rotate prop wheel monthly to lubricate bearings in the the gas supply line to the unit fan blower and motor 2 Turn off the electrical supply to the unit at the unit s disconnect Lock the disconnect to prevent tampering Figure 20 Pan Vizo HP LE AIAFLO Gas Porta AS aro 43 Dell Size Encep i sari hay Bender ori tha mbe action of iZel best asd 30 ap i 3 AS Strabglht Sections Ten Schonn e ir ia 474 Aerovent IM 500 20 TERMS AND CONDITIONS OF SALE 1 AGREEMENT AND ACCEPTANCE The terms and conditions set forth in this Agreement shall constitute the entire agreement between Twin City Fan Companies Ltd doing business as Aerovent Seller and Buyer and supersede all other agreements and understandings whether written or oral between the patties with respect to the subject matter hereof Seller acceptance of any offer by Buyer is expressly made conditional upon Buyer s assent to the terms and conditions hereof and none of Buyet s additional or different terms shall apply Acceptance of Seller s offer to sell is expressly limited to acceptance of the terms and conditions hereof and no other terms or conditions shall apply unless expressly agreed to by Seller by writing 2 PRICE All prices exclude federal state or local taxes customs duties charges consular fees permit and license fees and any other taxes fees or expenses which shall be added to t
35. gas hand cock will have to be opened at this time and the high and low gas pressure switches must be reset However the second main hand valve located before the modulating gas valve should be kept in the closed position 15 Recheck gas supply pressure Gage should show pres sure as marked at the gage 16 Check pilot and pilot ignition Open pilot gas hand cock only 17 Check to make sure that all manual reset safety devices have been teset to their normal operating position 18 Move the Summer Off Winter switch to Winter Move temperature controls to call for heat NOTE The mild temperature control set point needs to be set above the ambient outside temperature to allow the pilot and igniter to function Do not forget to reset to 65 F after final system checks are completed 19 Check to see that the pilot lights properly The spark igniter should begin to spark in approximately 10 sec onds and pilot flame should be established within 10 seconds 20 The unit is supplied with an ultra violet flame detec tor UV scanner With the UV detector scanner the output of the detector should be stable and should be between 1 25 and 5V DC at the flame relay terminals Adjust pilot regulator if the readings are outside of the specified ranges by removing cap screw and adjusting pilot flame with pilot needle valve Best results are obtained with smallest possible flame 2 11 2 turns clockwise from fully closed position
36. ge is not more than 2 higher or lower than 7 in w c on the system spec description adjust the Maxitrol gas valve regulator as per the vendor literature that is shipped with the unit W If pressure as indicated by U tube is more than 2 higher or lower than 7 in w c check the inlet gas pressure at unit Adjust main gas regulator to supply the correct gas inlet pressure as described on the unit s system specification description Multi Speed Units Units with two speed motors or variable airflow options require the following additional start up checks Two Speed Units 1 Check the motor and blower speed at both high and low speed 2 Check motor amps at both high and low speed Variable Airflow Units 50 50 60 40 or 70 30 Options 1 Check to make sure that the outside air burner bypass damper and return air damper operate correctly without binding 80 20 Building Pressure Control 1 Check that the outside air burner bypass damper and return air damper operate correctly without binding 2 Check to make sure building pressure control is operat ing correctly The building pressure control is designed to open the outside air burner by pass damper and close the return air damper as the negative pressure in the building increases To check if this is occurring turn on an exhaust fan and observe the return air damper position It should start to close Turn on additional exhaust fans The return air dampe
37. h defects have been caused by misuse neglect improper installation repair unauthorized modification Buyer s design alteration act of God or accident No warranty made hereunder shall extend to any Sellet s product whose serial number is altered effaced or removed Seller makes no warranty expressed or implied with respect to the specific application which Seller s products are used or the design or operation of an entire system in which Sellet s products sold hereunder are mere components nor does Seller make any warranty expressed or implied with respect to motors switches controls or other components of Seller s product where such components are warranted separately by their respective manufacturers Repair or replacement of the products sold hereunder or refund of the pur chase price as provided in this warranty is the Buyer exclusive remedy This exclusive remedy will not be deemed to have failed its essential purpose so long as Seller is willing and able to repair or replace any defective product or refund the put chase price in the prescribed manner THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED WHETHER STATUTORY OR OTHERWISE INCLUDING ANY WARRANTY OF MERCHANTABILITY INFRINGEMENT OR FITNESS FOR A PARTICULAR PURPOSE BUYER S FAILURE TO PAY THE FULL AMOUNT DUE WITHIN SIXTY 60 DAYS OF DATE OF INVOICE SHALL OPERATE TO RELEASE SELLER FROM ANY AND ALL LIABILITY OR OBLIGATION ARISING PURSUAN
38. he price or billed separately to Buyer where Seller has the legal obligation to collect or pay such taxes fees or expenses All such taxes shall be paid by Buyer Prices quoted are firm for thirty 30 days unless extended in writing by Seller Prices are firm provided release to manufacturing and shipment is completed by Seller within one hundred and twenty 120 days of receipt of purchase order from Buyer However prices may increase as a result of delays due to changes requested by Buyer or Buyer s failure to furnish information requested Seller reserves the right to change this policy at any time without written notice Seller reserves the right to charge at any time a monthly service charge of one and one half percent 1 5 or the highest rate allowed by Law whichever is lower on accounts outstanding more than thirty 30 days from the date of Seller s invoice effective as of the thirty first 31st day from the date of the invoice 3 PAYMENT TERMS If Seller has extended credit to Buyer as evidenced by notation to that effect on the face of this Agreement payment shall be due net thirty 30 days after date of Seller s invoice The amount of credit may be changed and or credit withdrawn by Seller at any time On any order on which credit is not extended by Seller shipment or deliv ery shall only be made at Seller s election after payment in cash with order in whole or in part C O D or by a sight draft upon presentation of bill
39. heater creates a hazard to other fuel burning equipment in the building e g when the heater is providing make up air to a boiler room the unit is to be interlocked to open inlet air dampers or other devices Inlet Ducts When inlet ducts are installed the heater MUST exchange the air inside the duct a minimum of 4X prior to an ignition attempt Please consult the manufacturer for instructions Aerovent IM 500 Special Precautions THE INSTALLATION AND MAINTENANCE INSTRUCTIONS IN THIS MANUAL MUST BE FOLLOWEDTOPROVIDESAFE EFFICIENTAND TROUBLE FREE OPERATION IN ADDITION PARTICULAR CARE MUST BE EXERCISED REGARDINGTHESPECIALPRECAUTIONSLISTED BELOW FAILURETOPROPERLYADDRESSTHESE CRITICALAREAS COULD RESULT INPROPERTY DAMAGE OR LOSS PERSONAL INJURY OR DEATH 1 In Canada only 100 outside air unit may be installed They must be solely for replacing exhausted inside air with heated air 2 Unit must be installed such that no source of flam mable vapor gases or dust is located within 20 feet horizontally of the unit unless that source is separated from the unit by an enclosure of fire and vapor resis tive materials 3 Disconnect all power before making wiring connec tions to prevent electrical shock and equipment dam age All units must be wired in strict accordance with the wiring diagram furnished and the NEC 4 Turn off all gas before installing equipment 5 Gas pressure to the unit controls must never exceed the gas su
40. his agreement shall be governed by and construed in accordance with the internal laws and not the laws of conflicts of the State of Minnesota U S A and the Buyer submits to the personal jurisdiction of courts located in Minnesota U S A The United Nations Convention on Contracts for the International Sale of Products shall not apply to this Agreement 20 VALIDITY If any provision of this Agreement is found to be invalid or unenforceable in any respect the validity and enforceability of the remaining provisions shall not be affected 21 MISCELLANEOUS All clerical errors are subject to correction Seller may subcontract the furnishing of any products sold hereunder and any portion thereof Aerovent IM 500 23 Aerovent 800 S High St Covington OH 45318 Phone 937 473 3788 Fax 937 473 3793 DIRECT GAS FIRED AIR MAKE UP START UP REPORT INSTALLATION amp MAINTENANCE Job Name Date Address Model No City amp State Order No Serial No WARNING BEFORESTARTINGUPAIRMAKE UPUNITREADSAFETYINSTRUCTIONSOFTHEMAN UAL TO ENSURE THATYOUORANYPERSONNELATTHEINSTALLATION SITE ARE NOT EXPOSED TO AN UNSAFE OPERATING CONDITION WHICH COULD BE DETRIMENTAL TO THEIR SAFETY Note All 12 13 14 units were test run and fired at the factory The following steps assure no damage occurred in shipment Any visible shipping damage to unit Describe All shipping straps braces tie downs removed Unit i
41. ibution system It is neces sary therefore to be sure that the setting of the supply line regulator is such that the pressure supplied to the unit will always be at least equal to the minimum and not exceeding 5 psi NOTE DO NOT VENT THE VENT VALVE AND PRESSURE REGULATOR IN THE SAME VENT PIPE SEPARATE VENT LINES TO OUTSIDE ATMOSPHERE MUST BE RUN FOR THE UNIT TO OPERATE PROPERLY COMBINING THE VENT LINES TO ATMOSPHERE WILL CAUSE THE HIGH LIMIT GAS PRESSURE CONTROL TO LOCK OUT THE FLAME SAFETY SYSTEM AND SHUT DOWN THE UNIT NOTE A PRESSURE REGULATOR MAY BE REQUIRED TO MEET THE STATE OR LOCAL CODE CONSULT YOUR STANDARDS Gas Supply Pressure Over 5 Ibs When the supply line pressure to an air make up unit exceeds 5 pounds or may at times fluctuate above 5 pounds it is necessary to install a line pressure regulator ahead of the input to the air make up unit The size must be selected to handle the maximum capacity of the unit and the type of regulator selected to work at the maximum inlet pressure and having a capability of maintaining the outlet pressure at some value between 8 ounces and 5 pounds As a rule the outlet pressure from the line pressure regulator may be adjusted anywhere between 2 and 4 pounds If the regula tor was furnished by Aerovent it has been sized according to the information in the original order and shown on the parts list Regulators are sized according to capacity and pressure and not according
42. ician Signature Date Return the start up report to your sales representative to activate the warranty The represetative will then re turn the report to the factory Please keep a copy for your records Contact Aerovent at 937 473 3788 if there are any questions DATE OF START UP Name and address of company doing start up Technician Signature Date n Return the start up report to your sales representative to activate the warranty The represetative will then re turn the report to the factory Please keep a copy for your records Contact Aerovent at 937 473 3788 if there are any questions Aerovent IM 500 26 Aerovent IM 500 27 Aerovent IM 500 AGIO AEROVENT WWW AEROVENT COM 5959 Trenton Lane N Minneapolis MN 55442 Phone 763 551 7500 Fax 763 551 7501
43. ide Buyer with contribution for any damages Seller has no obligation to Buyer to direct Seller s insurance companies to waive their right of subrogation against Buyer in the event of an insured loss 10 LIMITATION OF ACTIONS Any actions or claims by Buyer under this Agreement shall be brought within 18 months after shipment of the products sold by Seller hereunder 11 PATENTS When Seller has manufactured any products or parts thereof in accordance with specifications or drawings furnished by Buyer or when a product or a part thereof is made to Buyer s design Buyer at its own expense will defend any suit against Seller for infringement of patents and will satisfy any final award of damaged for such infringement provided Seller gives Buyer notice in writing of any such suit for infringement opportunity to conduct the defense thereof and assis tance and cooperation in said defense As to other articles furnished by Seller Seller at its own expense will defend any suit against Buyer for infringement of United States patents by any such product purchased from Seller when used or sold for its normal purpose and in any such suit will satisfy any final award of damages for such infringement but Seller assumes no liability consequential or otherwise for infringement or patent claims covering any components switches motors or other parts purchased by Seller from third parties or covering any other product or any completed equipment or any assembly
44. ion of a flammable mixture a pre purge cycle shall be incorporated to provide not less than 4 complete air changes to the ductwork or enclosure by volume prior to an ignition attempt Fire Dampers Fire dampers installed in the inlet or outlet duct systems shall be provided with electrical interlocks connected in the safety limit control circuit so as to cause the heater to shut down in case of fire in the ductwork or heater The elec trical interlocks must be so arranged that the safety circuit is electrically energized only when the fire damper is in the wide open position Utility Connections Electric and control connections can be made from the side or the bottom of the unit The factory supplied gas connec tor is located on the side of the unit The units normally are supplied with factory mounted disconnects holes can be cut in the fixed side panels or bottom of the unit for elec trical connections Sealing of holes cut in the unit casing for utility connections should be done with care to prevent air and water leaks All external wiring connections for out door units must be made with seal tight conduit All wiring must be in accordance with the National Electric Code Rigging Instructions Each unit is supplied with four mounting and lifting brack ets with 1 clearance holes for lifting hooks When units ate supplied with factory mounted accessories DO NOT use the accessory lifting eyes to sup port the loa
45. ipped loose to prevent damage Check gas supply pressure at manifold and compare to gauge marking max pressure 5 psi Check all piping including internal to burner for gas leaks with soapy water test Pressure regulators and vent valves are vented to outside area installing contractor responsibility on inside units Check to be sure manual resets on gas pressure switches have been manually reset and set point are correct Electric supply to unit ___ Volts Hz Phase Verify that motor name plate and control panel agree with supply voltage phase and hertz Make sure all hand gas shut off cocks are in closed position Energize main control panel by engaging main disconnect Set selector switch to summer and turn start switch to on position When starter kicks in after damper opens turn off immediately and check to see if blower wheel is rotating in correct direction Inlet and or discharge dampers operating correctly with no binding Blower speed Hi Speed___ RPM Lo Speed___RPM Motor speed Hi Speed___ RPM Lo Speed ____ RPM Is unit excessively noisy ___Dba Motor voltage L1___V L2__V L3__ V Motor amps High Speed L1___ Amp L2___ Amp L3___ Amp Low Speed L1___ Amp L2___ Amp L3___ Amp Is there excessive vibration __ Yes ___ No CONTACT FACTORY IF YES Switch selector to winter position and open manual shut off cocks to main gas and pilot lines Pilot sensor volts UV Volts D C 1 25 to 5 Volts D C Measure at
46. le solids liquids and gases b explosive materials ie grain dust coal dust etc and c substances that may become toxic when exposed to heat An electrical disconnect must be installed having ad equate ampacity see marking on the heater for voltage and ampacity if the unit was not provided with one This disconnect shall be installed in accordance with Article 430 of the National Electrical Code ANSI NFPA 70 This manual is the property of the owner Please be sute to leave it with them when the installation and start up of this equipment has been completed As Aerovent has a continuous product improvement program we reserve the right to change designs and specifications without notice FOR YOUR SAFETY The use and storage of gasoline or other flammable vapors and liquids in open containers in the vicinity of this appliance is hazardous Aerovent Regional Office 800 S High St Covington OH 45318 937 473 3788 Aerovent Headquarters 5959 Trenton Lane Minneapolis MN 55442 763 551 7500 2013 Aerovent Recirculating Units WARNING On heaters which recirculate ait outside ventilation air must be provided in accordance with the information shown on the heater nameplate Building Relief Adequate building relief MUST be provided so as not to ovetpressureize the building when the heating system is operating at its rated capacity It should be noted that this can be accomplished by taking into accou
47. llowed in the line Refer to the air make up data form to determine the Btu capacity of the unit and the type of gas the unit is designed to use Using this information refer to the ASHRAE Guide Fundamentals Handbook or other gas pipe sizing guide to determine the correct supply pipe size Allow sufficient pipe size based on allowable pressure dtop in supply line Where several units ate served by the same main the total capacity of all the units served by the main must be used Avoid pipe sizes smaller than 1 7 a 3 After threading and reaming the ends inspect piping and remove loose dirt and chips 4 Support piping so that no strains ate imposed on the unit controls 5 Use two wrenches when connecting field piping to units 6 Provide a drip pocket before each unit and in the line where low spots cannot be avoided 7 Take off to unit should come from top or side of main to avoid trapping condensate 8 Piping subject to wide temperature variations should be insulated 9 Pitch piping at least 4 per 15 feet of horizontal run 10 Compounds used on threaded joints of gas piping must be resistant to action of liquefied petroleum gases Aerovent IM 500 11 Purge air from gas piping before lighting unit 12 After air has been purged check for gas leaks in the piping system using a soap water solution 13 Install a ground joint union and gas cock external of the unit for easy servicing of controls 14 Allow at least
48. nally or light replace the RM7890 NOTE 13 and 14 come on at the same time 13 will go out after flame is proven 14 will stay on for the ten second flame establishing period 15 is energized when 13 is turned off If lamp 15 does not light check 1 Is lamp 15 getting power or is the bulb defective 2 Are the valves opening and staying open 3 Is the flame light on the flame relay coming on The flame being proven during PFEP 4 See check out procedure for C7027A sensor under 13 amp 14 If lamp 16 does not light check 1 Is lamp 16 getting power or is the bulb defective 2 Operation of safety shut off valve 3 Auxiliary switch in the safety shut off valve NOTE If all lights come on for approximately one minute then 14 15 and 16 go out followed by a shutdown in 15 seconds check flow of gas through valves to burner and also burner port openings When unit has been checked turn the circuit analyzer off These ate 20 000 hour neon lamps and should last the life of the equipment unless the analyzer is left on after use NUISANCE SHUTDOWNS Occasionally the unit may shut down during normal opera tion Simply by turning the selector switch to the off position for 30 seconds then back to Winter the unit will start again through a complete cycle and run normally This condition could be caused by one of the following 1 Momentary Loss of Power 2 Low Temperature Limit 3
49. ng equipment 14 Consult piping electrical and venting instructions before installation Keep all literature shipped with the unit for future servicing Leave all literature with the owner 15 If the failure or malfunction of this heater creates a hazard to other fuel burning equipment in the building the unit must be interlocked to open inlet air dampers or other such devices Installation amp Manufacturing Codes Manufacturing A The units as constructed conform to ANSI Air Make Up std Z83 4 Z83 18 Z223 1 and HFPA54 B Wiring within the control panel meets and carries the UL508 label and meets ANSI INFPA 70 1987 C Piping within the unit meets ANSI Code Z223 1 National Fuel Gas Code D Fan performance tested in accord with AMCA 210 E Fan Sound tested in accord with AMCA 310 F Insurance codes IRI and FM as requested G Equipment components supplied carry the UL electri cal listings Installation codes governing unit installation by contractors A ANSI Z83 4 Z83 18 or Z223 1 latest edition as applicable Aerovent IM 500 w All installation of this equipment must be performed by a qualified installation agency only defined in ANSI Z223 1 Electrical ANSI INFPA 70 1987 Aircraft hangar NFPA 409 National Fuel Gas Code NFPA 54 Installation of air conditioning and ventilating systems NFPA 90A Parking Structures and Repair Garages NFPA 54 1 amo O Unit Location Restrictions an
50. noted hash mark See unit rating or system spec for high fire burner pressure setting Also see manifold component dia grams 26 Observe low fire flame to make sure it LIGHTS ACROSS THE ENTIRE LENGTH of the burn er is stable and burning with a clean blue flame 27 Move the Maxitrol temperature setting control to its highest setting and observe the high fire flame Make sure that it is stable and burning clean A slightly orange tip may be evident and is acceptable 28 High Fire Adjustment Disconnect lead 4 on series 14 or leads 2 and 4 on series 44 from the amplifier which will cause the burner to go to a high fire condi tion The flame length should be 10 in and burn with a slight orange tip Adjust the pressure regulator in the Maxitrol valve accordingly by removing the seal cap adj pressure reg screw should give manifold pressure of 7 in Return wires to terminals when adjustments are complete 29 Low Fire Adjustment Disconnect wire from term 8 in the amplifier Remove cap and obtain a flame that is a ribbon across the entire burner being sure flame is stable Tighten the setscrew replace the cap and recon nect wire to term 8 30 Check the burner gas pressure at high fire to make sure the unit is not over or under fired If the burner is not firing at the pressure marked on the units gas pressure gauge adjust the main supply pressure regulator accordingly 31 After the high fire pressure has been
51. nstalled level and secure All seams properly caulked where unit was assembled in two or more sections All filters installed in racks properly with airflow in proper direction Bolts on taper lock bushings securing wheel and drive sheaves have been checked to be sure that they are tight Bolts on motors and bearings have been checked to be sure that they are tight and drives are properly aligned Bearings checked for proper lubrication Belt tension checked Rotate wheel to make sure nothing is rubbing and bearings allow to rotate without binding Check air inlet and discharge areas for debris which could be drawn into fan wheel or blown into dis charge area Check all electrical wiring to be sure connections are tight and are making good contact Blow out all new supply piping lines with air before connecting to the pipe train to be sure they are free from foreign materials that could prevent proper seating of safety shut off valves strainers are suggested Bleed gas supply line of air before starting unit Reference ANSI procedures Z223 1 latest edition Unit will lock out on safe shut down until raw gas reaches the gas train and pilot lights off Aerovent IM 500 15 16 17 18 19 20 21 22 23 24 25 26 2h 28 29 30 31 32 33 34 35 Gas supply to unit ___Natural ___ Propane Gas supply pressure to unit Wwe __ psig Mount UV sensor on sighting tube sh
52. nt through stan dard engineering methods the structure s designed infiltra tion rate by providing properly sized relief openings ot by interlocking a powered exhaust system or by a combination of these methods Control Wiring Entry for control wiring should be ran into the control room provided Please consult unit drawing and locate the control room on that drawing REFER TO THE HEATER RATING PLATE FOR DETERMINING THE MINIMUM GAS SUPPLY PRESSURE FOR OBTAINING THE MAXIMUM GAS CAPACITY FOR WHICH THIS HEATER IS SPECIFIED Insulated Units It is NOT recommended that a recirculation unit be installed in a building that is NOT insulated where the out side air temperature falls below 32 F Ventilation Air Excessive recirculation ot insufficient ventilation ait which results in inadeguate dilution of the combustion products generated by the heater may create hazardous concentra tions of carbon monoxide nitrogen oxide and other com bustion products in the heated space Fossil Fuel Powered Equipment If gas fork trucks or other fossil fuel powered equipment ate utilized in the conditioned area additional ventilation requirements for the factility must be addressed separately Applications If there is any doubt in the application of this heater con sult the manufacturer Ventilation Air All ventilation air to this heater MUST be ducted directly from the outdoors Interlocks If failure or malfunction of this
53. operly caulked and secured before operating the equipment 11 Provide sufficient airflow across the burner Refer to unit data sheet for required airflow cfm 12 Units with motor horsepower below 7 5 hp are sup plied with an adjustable motor sheave Units with 7 5 hp motors and above are supplied as standard with fixed motor and blower drives Units are supplied from the factory with drives set for static pressure conditions provided at the time of order Check to make sure the actual job site conditions match the conditions for which the unit was ordered If proper airflow cannot be established with the drives furnished with the unit contact the factory for information on drive changes 13 For economical installation and operation locate each unit close to the space it will serve and close to the utilities that will serve the unit Site Preparation Before attempting to install the unit be sure the site is properly prepared 1 Make sure there is enough clearance around the instal lation site to properly and safely rig and lift the equip ment 2 Watch for overhead power lines or nearby utilities to prevent accidental contact and damage 3 Make sure the unit supports are adequate to support the equipment Sound and Vibration Levels All mechanical equipment generates some sound and vibra tion that may require attenuation Locate the equipment away from critical areas whenever possible Frequently units can be mounte
54. or supplied by oth ers require field adjustment It is important to check to make sure that the gas supply pressure to the unit is in accordance with the input pressure rat ing shown on the unit specification description CAUTION Check gas supply pressure at the unit upstream from the pressure regulator Purging air from gas line and piping should be performed as described in ANSI Z223 1 latest edition National Fuel Gas Code or in Canada CAN CGA B149 Codes Strainers are recommended to prevent foreign material from preventing the safety shut off valve and blocking valves from properly seating To properly perform the start up the following instru ments are required Test Instruments Volt Meter 25 460 volt AC Amp Meter 0 50 amp Ohm Meter Slack Tube Manometer or 0 30 w c Pressure Gauge Hand Held or Strobe Type Tachometer 1 Turn off power to the unit at the disconnect switch Turn all hand gas cocks to the off position 2 Set the Summer Off Winter switch on the Remote Panel to the Off position and all temperature con trol stats to their lowest setting 3 Check to see that there are no obstructions to the inlet ait supply or the discharge air supply ducts and air make up compartments and return air recirculation section if supplied 4 Check to see that all wiring is secure and properly pro tected 5 Recheck belt tension and pulley alignment 6 Check bearings for proper lubrication 7 Che
55. pply pressure on the data sheet The unit and its individual shutoff valve must be disconnected from the gas supply during any pressure testing of gas sup ply piping system at pressures greater than the supply pressure shown on the unit s data sheet Maximum pressure to the unit shall never exceed 5 psig 6 Check the gas supply pressure at the pressure gauge upstream from the pressure regulator A pressure regulator which will satisfactorily limit the gas supply pressure must be installed with each heater Purging ait from gas lines and piping must be performed as described in ANSI 2223 1 latest edition National Fuel Gas Code or CAN CGA B149 codes in Canada STRAINERS BETWEEN THE SUPPLY LINE AND AIR MAKE UP UNIT ARE HIGHLY RECOMMENDED 7 Check damper operation to insure damper blades travel to their full open position and that the damper end switch is functioning properly 8 To prevent unit or building structural damage do not operate unit where combustion air may be exposed to chlorinated halogenated or acid vapor laden air 9 Minimum clearances to combustibles must be main tained The minimum clearances to be maintained are 6 from the top ends and sides of the unit Allow a 36 minimum clearance on the sides of the unit for servic ing Access doors are provided for servicing the gas controls electric components and drive adjustment The unit must be installed such that the surface tempera ture of any adjacent com
56. r should close further With all of the exhaust fans running the return air damper should be in the fully closed position and the burner by pass damper should be in the fully open position Check and adjust as necessary After all the initial start up procedures have been performed the unit is ready for commissioning Set the temperature controls for the recommended control safety device settings High gas pressure switch set at 12 in w c Low gas pressure switch set at 2 in w c High temp thermostat 150 F Low temp thermostat 40 F Mild weather thermostat set at 65 F Reset timer 3 min Room temp Set point as desired Airflow switch approx 2 3 turns from closed position Building pressure control 0 01 to 0 03 in w c If the unit is to be left for stand by operation set the Summet Off Winter switch to the Off position and turn the electric power off at the unit s disconnect switch NOTE LOSS OF WARRANTY OCCURS IF WARRANTY START UP REPORT IS NOT SUBMITTED TO AEROVENT Warranty Start up Report A Start Up Report form is included in the back of this manual Before turning the unit over to the owner make sute the Start Up Report has been completely filled out signed and dated Submit a copy of the start up report to Aerovent Company 800 S High St Covington OH 45318 The fax number is 937 473 3793 Operating Sequence Remote Switch in Off Position With Summer Off Winter swit
57. ranged to operate in sequence The analyzer is turned on by the toggle switch If any circuit is not energized the sequence will stop at that point until the fan shuts down approximately 90 seconds It should be emphasized that the circuit analyzer will show the location of a malfunction only during the starting cycle To start a new cycle turn the unit off wait 30 seconds and then turn it on again Observations are made with the discon nect switch closed and the selector switch in the Winter position If lamp 3 does not light check 1 Is lamp 3 getting power or is the bulb defective 2 The fuse Buss FNM 5 amp 3 Line voltage on the primary side of control transformer 4 Control voltage on secondary side of control trans former 5 Jumper between H and 1 on the terminal strip 6 Continuity between 1 and 3 on the selector switch If lamp 4 does not light check NOTE May not come on until flame is established 1 Is lamp 4 getting power or is the bulb defective 2 Contacts and operation of low temperature limit ther mostat Dial setting 30 Temp below setpoint If lamp 5 does not light check 1 Is lamp 5 getting power or is the bulb defective 2 Contacts and operation of reset timer If lamp 6 does not light check 1 Is lamp 6 getting power or is the bulb defective 2 Operation of shutter motor If lamp 7 does not light check 1 Is lamp 7 getting power or is the bulb
58. rection labor disputes or shortages act of God strike shortage of raw materials supplies or components retooling upgrading of technology delays of carriers embargo government order or directive or any other circumstance beyond Seller s reasonable control Buyer agrees that Seller shall not be liable for any direct indirect consequential or special damages that may result from any such delays 6 DELIVERY TERMS RISK OF LOSS Unless otherwise agreed to in writing by the Seller all deliveries shall be RO B Seller factory Seller will attempt to meet the requirements of Buyer s delivery schedule but shall be obligated only to the delivery schedule shown on the order acknowledgment and Seller shall not be in default of performance due to a delay of reasonable duration resulting from any cause All delivery expenses including transportation freight insurance and any other shipping costs and tisk of loss during delivery and transportation shall be for the account of Buyer Claims for damages in transit must be assessed against the carrier Unless otherwise instructed selection of cartier and routing of all shipments shall be at Seller s discretion All boxing and packaging charges for sales shall be added to the price When special packaging is specified for domestic or export sales involving greater expense than that customarily supplied a charge may be made to cover such extra expense Shipment dates for export sales are approximate
59. rmal steady running light duty indoor loads in relatively clean atmosphere at 40 C 105 F ambient temperature or less Motors with no provision for lubrication are equipped with sealed beatings and require no maintenance Motors mounted in inaccessible locations are provided with extended grease lines to facilitate lubrication They are equipped with relief fittings to prevent overlubrication The grease lines are filled with lubricant at the factory SERVICE INSTRUCTIONS FOR FILTERS If the unit is supplied with a dirty filter switch and light clean or replace the filters any time the dirty filter light comes on Units which do not have a dirty filter warning light should have the filters checked monthly Clean or replace if necessary In dirty atmospheres filter maintenance may be required more often SERVICE INSTRUCTIONS FOR BURNERS Generally direct fired burners tend to be self cleaning however if the unit is installed in a severely dirty environ ment a periodic cleaning of the burner may be required Depending on the size of the burner it may not be prac tical to attempt to remove the burner from the unit The burner can still be cleaned by using the following steps 1 Turn off gas and power Remove the pilot and igniter assembly from burner 2 Break the gas union at the burner and isolate the burner piping from the manifold piping 3 Seal the open end of the manifold piping with duct tape or other means to prevent di
60. rt from entering the mani fold pipe and or gas controls 4 Using a high pressure air hose 40 to 80 psi flush the burner gas ports from the flame side of the burner Continue flushing until dust particles are removed NOTE If air pressure alone is not sufficient to clean the burner gas ports the ports may be cleaned by using the appropriately sized drill from a numbered drill set Consult Maxon literature at www maxoncorp com for the proper bit NP LE burners require different bits than that of an NP 47 See Figure 20 When using a drill to clean the burner gas ports be careful not to distort or enlarge the ports xxx CAUTION KNOW WHICH BURNER YOU HAVE PRIOR TO DRILLING 5 Examine the stainless steel mixing plates carefully They should be clean and not warped or cracked It is especially important to make sure the mixing plates nearest to the burner manifold are clear Mixing plates can be cleaned with compressed air or wire brush 6 Remove the protective cover which was placed on the manifold piping in Step 3 and reconnect the gas union 7 Reassemble pilot and igniter assembly to the burner 8 After cleaning and reassembly use a soap water solu tion to check for gas leaks in the piping 9 Restore power and gas to the unit Reset pressure switches 10 Run the fan in the Summer position to see that the damper is opening and closing properly Be sure that the gas is on and the proper pressure is indic
61. sired to ship a larger or vertical unit in one piece please contact your representative immediately Inspect all seams after installation and recaulk as needed A small hole in the caulk or a seam not caulked will allow water penetration Roof Curb Mounted Units Roof curbs should have a minimum height of 14 24 high roof curbs are available and raise the unit above roof water and snow levels where required and are special ordered The curb can be installed with the roof in advance of the unit The curb is shipped knocked down with separate instructions for its assembly flashing and sealing with the roof Rail Mounted Units To ensure longevity and integrity of the section joints con tinuous rail mounting is preferred When rail mounting the units use two continuous rails for the length of the unit in direction of airflow Where V bank filters dampers and inlet hoods are supplied additional supports are not Aerovent IM 500 required as structural design of accessories will support these items However rails should be extended to support cross members of the accessories Check the drawings in the front of this manual Electrical Connections CAUTION Disconnect power source before making wiring connec tions to prevent electrical shock and or equipment damage WARNING ALL UNITS MUST BE WIRED STRICTLY IN ACCORDANCE WITH THE WIRING DIAGRAM FURNISHED WITH THE UNIT AND IN ACCORDANCE WITH THE NATIONAL ELECTRIC CODE ANS
62. stment under the brass screw cap Remove the brass screw cap to make the pilot flame adjustment The pilot works best with the smallest possible flame and this is usually with the needle valve screw backed out 2 to 1 2 turns from the fully closed position Figure 10 Adjustable Orifice There are three 3 fully modulating temperature control systems offered 1 OUTLET TEMPERATURE CONTROL SYSTEM OTC Series 14 holds constant outlet temperature adjustable at the remote operating station and has out door temperature compensation The discharge air temperature thermostat actuates the modulating regulator to hold average outlet tempera ture to a set point located in the remote station 2 OUTLET TEMPERATURE CONTROL SYSTEM OTC RO Series 14 w T115 Override with room over tide Optional A T115 room space temperature control increases the discharge air temperature until room tem perature is satisfied The room set point is adjustable This system does not allow a room to fall below the set point of the Room Override thermostat Once the room thermostat is satisfied the temperature is then backed down to the TD114 set point The increase of temperature is controlled set by a selector dial on the back of the TD114 Discharge air temperature thermostat automatically limits extreme changes in discharge temperature 3 MODULATEDROOMTEMPERATURECONTROL MRTC Series 44 Optional maintains room tempera ture within very narrow limits
63. titute parts or products as long as such substitutions perform equal or better than the original product or part thereof and shall have the right to deliver revised designs or models and such substitute products or parts against any order 13 NONWAIVER OF DEFAULT Each shipment made under any order shall be treated as a separate transaction but in the event of any default by Buyer Seller may decline to make further shipments without in any way affecting its rights under such order If despite any default by Buyer Seller elects to continue to make shipments its actions shall not consti tute a waiver of any default by Buyer or in any way affect Seller legal remedy for such default Seller failure to deliver or nonconformity of any installment of this Agreement shall not be a breach of the entire Agreement 14 TERMINATION If the products to be furnished under this order ate to be used in the performance of a Government contract or subcontract and the Government terminates such contract in whole or in part this order may be cancelled in the same proportion and the liability of Buyer for termination allowances shall be determined by the then applicable regulations of the Government regarding termination of contracts No termination by Buyer for default shall be effective unless Seller shall have failed to correct such alleged defect within fifteen 15 days after receipt by Seller of a written notice specifying such default 15 ASSIGNS This
64. to pipe size therefore the size of the pipe at the inlet to the air make up unit may not be the same as the pipe size of the regulator To be sure the supply line is properly sized it is sug gested that the representative of the local gas company be consulted about pipe sizing The line regulator should be installed close to the air make up unit There should be no elbows couplings valves or fittings within at least ten pipe diameters of the inlet and the discharge of the pressure regulator A shut off cock should be placed upstream of the regulator so that it can be removed for servicing if nec essary It is a good idea also to install a pressure gauge on the upstream side having a scale range sufficient to indicate the supply line pressure It is very important to connect the regulator vent with pipe or tubing extended to the outside with the end pro tected from the weather Do not vent the regulator into the ait make up unit or the duct system or near the inlet to the air make up unit NOTE DO NOT VENT THE VENT VALVE AND PRESSURE REGULATOR IN THE SAME VENT PIPE SEPARATE VENT LINES TO OUTSIDE ATMOSPHERE MUST BE RUN FOR THE UNIT TO OPERATE PROPERLY COMBINING THE VENT LINES TO ATMOSPHERE WILL CAUSE THE HIGH LIMIT GAS PRESSURE CONTROL TO LOCK OUT THE FLAME SAFETY SYSTEM AND SHUT DOWN THE UNIT Figure 1 Typical Gas Regulator Wain Siljalle Spring Minn aphegm camilla alle Aerovent IM 500 Figure 2 Piping Config
65. uration Ge super Lito Maral Grou loin Shut oi Union wilh EA Arma wal TEA Spy Lii Piik Lar HPT Taal Fo Cage Cothen Ceno ta Min Drip Poskal Operation Instructions PRIOR TO OPERATION Although this unit has been assembled and test fired at the factory the following pre operational procedures should be performed to assure the unit has not been damaged or misaligned during shipment This will help assure proper on site operation 1 Remove all shipping straps braces and tie downs 2 Check burner to insure proper location and if airflow is moving across burner correctly The burner may be wrapped if so remove wrapping This is important if unit was split for shipping convenience Also check to be sure sections were caulked when assembled 3 Check blower and motor sheave alignment as well as belt tension 4 Check bearings for alignment and tightness of mounting bolts bolts securing taper lock bushings to shaft and that locking collars are secute 5 Check all electrical connections to insure wires are mak ing good contact and are secure in their terminals Check tightness of jumpers between terminals 6 Check gas piping for leaks using a soap water solution After these preliminary checks have been made the unit can be prepared for start up Start Up and Check Out Each unit is supplied with a service manual which includes a Field Start Up Form The Field Start Up Form must be followed and prop

Direct Fired Air Make-Up Unit - IM-500

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