IMA Direct Gas-Fired Makeup Air Units

1 EXCELLENCE THROUGH PRovEn PERFoRMAnCEIMAD irect Gas-Fired Makeup Air UnitsINDUSTRIAL COMMERCIAL EQUIPMENT MANUFACTURING LTD. 21/9/08 1:54:46 PMINDUSTRIAL COMMERCIAL EQUIPMENT MANUFACTURING founded as Bullocks Manufacturing during the post-war residential housing boom, Manufacturing was recognized for innovation and excellence early in our history. After the company established a reputation for designing, manufacturing and installing natural gas conversion burners for oil and coal- fired furnaces, founder Don Bullocks returned from an ASHRAE trade show with a natural gas line burner. Inspired, he set out to manufacture the first Direct - fired Makeup air unit in his home country of , the natural gas revolution continues with Manufacturing at the forefront of the commercial Direct - fired industry.

2 Don had the vision long before many others by designing a product that has outlived his legend. Our BMA Series is named for him (Bullocks Makeup Air). This forward thinking has carried on through such advanced products as the HTDM, the gas valve technology available on the BMA, and the industrial-quality GIDM product of our products have withstood the test of time. Many new products are on the horizon to meet the ever-increasing concern over energy costs, consumption and impact on our environment. We are building on our heritage to bring exceptional Gas-Fired products to is committed to success the success of our customers and our employees. To us, success is driven by loyalty that comes from service, quality and innovation. With our vast experience in the HVAC industry, we continue to listen to and understand the needs of our customers.

3 And we trust we will be able to serve you well into the THROUGH PRovEn 31/9/08 1:54:49 PMTable of ContentsWhy Direct - fired Makeup air? / Selection GuiDe For Direct - fired Makeup air .. 1 StanDarD FeatureS / optional FeatureS / aDDitional optionS .. 2iM SerieS StanDarD teMperature control optionS / MiScellaneouS control optionS .. 3iM Direct - fired SerieS perForMance SpeciFicationS .. 4 Static preSSure Drop Due to acceSSorieS / GaS inlet SiZinG .. 6iMa SerieS Direct - fired heaterS hor. conFiGuration .. 7iMr SerieS 80/20 Direct - fired heaterS hor. conFiGuration .. 8iMa SerieS Direct - fired heaterS hor. conFiGuration W/ V-Bank & inlet plenuM .. 9iMa SerieS 80/20 Direct - fired heaterS hor. conFiGuration W/ V-Bank & inlet plenuM ..10iMa SerieS Direct - fired heaterS W/ plenuM Fan hor. conFiGuration W/ V-Bank & inlet plenuM.

4 11iMa SerieS 80/20 Direct - fired heaterS W/ plenuM Fan hor. conFiGuration W/ V-Bank & inlet plenuM .. 12iMa SerieS Direct - fired heaterS Vertical conFiGuration .. 13iMr SerieS 80/20 Direct - fired heaterS Vertical conFiGuration .. 14iMa SerieS Direct - fired heaterS W/ eVap hor. conFiGuration .. 15iMr SerieS 80/20 Direct - fired heaterS hor. conFiGurtion W/ V-Bank & hor. coil plenuM .. 16iMr SerieS 80/20 Direct - fired heaterS hor. conFiGuration W/ V-Bank, inlet & coil plenuM ..17iMr SerieS Direct - fired heaterS W/ conDenSor hor. conFiGuration W/ V-Bank, inlet plenuM & coil .. 18iMr SerieS 80/20 Direct - fired heaterS hor. conFiG. W/ V-Bank, coil plenuM & Final FilterS .. 19iMr SerieS 80/20 Direct - fired heaterS hor. conFiG. W/ V-Bank, inlet & coil plenuM & Final FilterS .. 20iMr SerieS heat recoVery Direct - fired heaterS hor.

5 ConFiG. W/ V-Bank & plate-to-plate heater eXch.. 21iMr SerieS heat recoVery Direct - fired heaterS hor. conFiG. W/ V-Bank & heat recoVery Wheel .. 22iM SerieS rooF curB .. 23iM SerieS acceSSorieS .. 24heat recoVery unit StanDarD Make-up & relieF operation .. 11/11/08 10:10:48 21/11/08 10:10:48 AMHow To - Determine whether the unit will be for heating and cooling, humidifying, dehumidifying, or any combination of the above. For cooling and humidifying visit for design guide. - Determine the maximum air volume requirement. this is generally 10% greater than the maximum air volume of the exhaust system for the space. this will allow the room to be positively pressurized. however, in some Makeup systems this may be reversed in order to keep the space negatively pressurized, keeping odors, toxins, etc.

6 Confined to the conditioned space. - once this is known, refer to the iMa Series performance Specifications to choose the model that can deliver this amount. - the corresponding horse power (hp) can then be taken from the iMa performance Specification chart, given the external static pressure (eSp Wc).note: add the necessary accessory pressure drop(s) to the eSp. Given the blower hp and line voltage, determine the running Motor amperage, inrush Motor amperage and Full load amps (Fla). - knowing the unit Model number and MBh capacity the corresponding gas connection size can be taken from the iMa Series Specification table. - Given the entering and leaving dry bulb temperatures or temperature rise, the equation below can also be used to calculate the required MBh capacity.

7 MBh capacity = (cFM x c x (lat-eat))/1000 MBh capacity: Btuh/1000 (British thermal Units per hour). cFM: cubic Feet per minute of air. c: Gas constant of based on an air density at 75 deg. F eat: entering air dry bulb temperature ( deg. F) lat: leaving air dry bulb temperature (deg. F)Examplea room is exhausting 8000 cFM. the desired room temperature is 70 deg. F. the winter design condition for the area is -10 deg. F. the unit chosen is to be an outdoor Direct - fired unit whose discharge is downwards. the eSp is the line voltage to the unit is 600/3/60. Gas connection is on the right hand :1. the supply air capacity Which unit is capable of delivering the required supply air volume, while not exceeding a Bhp of note: Because it is an outdoor unit you will require an inlet louver or hood and filter section.

8 For this example, we will use an inlet hood with running Motor the MBh capacity and corresponding gas connection size unit Since the exhaust air volume is 8000 cFM, the supply air capacity should be the same if no pressurization requirements were specified. therefore, the supply air capacity is 8000 referring to the iMa performance Specification table, the iMa 118 and iMa 120 are capable of delivering the required 8000 cFM of supply air. the unit must have a maximum of hp when the static pressures of the unit and eSp are added together and applied to the table. therefore: eSp= (Given) inlet hood w/filters = + tSp tSp use on the chart to be conservative. the corresponding hp s at iMa118.

9 5 hp IMA120 ..3 HP the Units that can be used are the iMa118 and the the running Motor amperage for a 5 hp motor at 600/3/60 is amps .4. the MBh input required for an eat of -10 deg. F and a lat of 70 deg. F (80 deg. F rise) is 760 MBh. MBh = (cFM x (lat - eat)) / 1000 MBh = (8000 x (70-(-10)))/1000 = 760 MBh the corresponding gas connection size required is 1 the unit configuration is hrB for a horizontal right hand unit with a bottom Direct - fired Makeup Air?Inexpensive to Operate Direct gas firing is 100% effective. in the majority of gas fired appliances which utilize heat exchanging devices approximately 20%, and usually more of the thermal content of the fuel is lost in vented flue gases as well as up to an additional 10-15% lost in piping or ducting.

10 With Direct firing, 100% of the fuel s energy is absorbed by the Makeup to Install and Maintain only a gas line to the burner and an electrical hook-up to the air blower motor and controls are required. the burner does not require an air gas premixer, consequently, installation and maintenance are considerably simpler and more Safe combustion is electronically supervised to provide shut down in the event of flame failure. an adequate supply of circulating air is ensured by an air velocity interlock switch or the burner is automatically shut down. excessive temperatures are guarded against by a manual reset high limit switch. the burner produces no harmful concentrations of carbon monoxide in the air stream. the nozzle design eliminates mechanical devices for mixing and controlling.