Direct Fired Gas Heated Make Up Air Unit Operation ...

1 Direct Fired Gas Heated make up air UnitOperation/ installation ManualWARNING!Improper installation , adjustment, alteration, service or maintenance can cause propertydamage, injury or death. Read the installation , operating and maintenance instructions thoroughly beforeinstalling or servicing this YOUR SAFETYIf you smell gas:1. Open Don t touch electrical Extinguish any open Immediately call your gas YOUR SAFETYThe use and storage of gasoline or otherflammable vapors and liquids in open containers inthe vicinity of this appliance is Engineering & Manufacturing Box 978 Muskogee.

2 OK 74402918/682-7791 918/682-0134 2000 Form INFORMATION 2 Receiving EquipmentDirect Fired AND OVERVIEW 3 Temperature vs. HeatStatic Pressure vs. HorsepowerGas PRINCIPLES 8 VII. installation PROCEDURE 9 VIII. START UP SHOOTING DIAGRAMS NOTES 18 XII.

3 MAINTENANCE 18 XIII. PULLEY COMBINATION CHART 19 WARRANTY INFORMATIONR eceiving EquipmentInspect for damage upon receipt of manufacturer thoroughly inspects and testsall units before shipping. When a freight carriersigns for a shipment, they are acknowledgingreceipt of the shipment and the number of piecescontained in the shipment as compared to thefreight bill. When you receive the shipment,carefully read the freight bill and verify that allpieces are received.

4 Note at this time anydamaged or missing items on the freight bill beforesigning. You should get the driver s signature toconfirm any damaged or missing pieces (aphotograph is a sure way to document this).Most heaters have options that need to be fieldinstalled. Be sure all these are accounted forbefore the delivering carrier leaves. Check allitems received with the packing list enclosed withthe for any internal damage should also bemade. Any missing parts or damage discoveredat a later date may prevent you from having avalid claim with the carrier.

5 If the equipment is notgoing to be installed immediately, proper storagewill prevent Fired HeatingThis Direct Fired Heater is a make up air unit . It isonly to be used for installations requiring frequentair changes. Some examples are commercialkitchens, factories, foundries, and paint unit is NOT designed for space heating. Allunits can be used with either natural gas or LPgas. Read this manual before beginning3installation. Direct Fired heaters are designed tooperate in a fresh flowing air stream.

6 If the airflowstops or is different from the factory settings, theunit will shut down or perform below its designcapability. It is important to follow the installationand start-up procedures to maximize the heater sperformance. The manufacturer has designed aunit that is easy to install, start up and service. Ifyou have any questions, call the ServiceDepartment at INTRODUCTION AND OVERVIEWT here are many types of heaters available forcommercial use. We will concern ourselves with100% fresh air ( make up air ) Direct Fired Gas unitsfor commercial kitchen and industrial use.

7 Theadvantages of Direct Fired gas heaters include: Low cost per BTU of heating Readily available Most efficient heat transferThere are two general types of gas- Fired heaters, Direct and Fired heaters,like aresidential furnace, burn gas inside a metal tubecalled a heat exchanger. The air that is used toheat the application is Heated indirectly when it ispassed around the tubes. This air never comes incontact with the flame. The combustion productsfrom the flame inside the tubes are exhaustedthrough a flue pipe to the atmosphere.

8 Adirectfired heaterburns the gas directly in the air products of combustion are included in the airthat is used to heat the APPLICATIONST hese Direct Fired heaters are well suited for awide range of uses in the commercial andindustrial field. For kitchen ventilation, whereheated make up air is needed in large volume incool climates, the Direct Fired unit is a prime is able to handle large volumes of air withsubstantial temperature rise at minimal units are reliable, and most replacement partsare readily available in the plants and processes where there is alarge amount of air being exhausted are excellentcandidates for Direct Fired units.

9 Where weldinghoods and plasma tables are used, the Direct firedunit can provide fresh outside air at a comfortabletemperature for occupants. Today the trend istoward less user interaction with the heater customers prefer the unit to sit on the roof, turnon, and run by itself with no user interaction(temperature selection, summer-winter selection,etc.). This means that the field installation has to bedone properly; no user interaction can cover upinstallation problems. Now, more than ever, installation and start up is critical to customersatisfaction and product THEORYE nergy (heat) must be added to a specific volume ofair in order to change its temperature.

10 Direct Fired gasheaters create heat by burning gas. Heat is measuredin BTU s (British Thermal Units), which is a measureof heat, not vs. HeatThe temperature changes when the energy of aspecific volume of air increases or decreases. Energy(in the form of heat) is added to a volume of air andchanges the temperature. When this energy is addedto different volumes of air, different temperatures areachieved. To further illustrate this point, let s look athow to calculate temperature rise, , the differencebetween the air temperature after it is Heated andbefore it is s T = --------------CFM X equation shows that if the CFM sincreaseandthe BTU s remain constant, the temperature rise willdecrease.