AAON RM SERIES

1 1RM SERIESHEATING COOLING & COMBINATIONROOFTOP UNITSINSTALLATIONINSTRUCTIONMANUALs! WARNINGIf the information in this manual is not followedexactly, a fire or explosion may result causingproperty damage, personal injury or loss of YOUR SAFETYDO NOT STORE OR USE GASOLINE OR OTHERFLAMMABLE VAPORS AND LIQUIDS IN THEVICINITY OF THIS OR ANY OTHER APPLIANCE. EXTINGUISH ANY OPEN FLAME. DO NOT TOUCH ANY ELECTRICAL SWITCH. DO NOT TRY TO LIGHT ANY APPLIANCE. DO NOT USE ANY PHONE IN YOUR BUILDING. IMMEDIATELY CALL YOUR GAS SUPPLIER FROM A NEIGHBOR'S PHONE. FOLLOW THE GAS SUPPLIER'S INSTRUCTIONS. IF YOU CANNOT REACH YOUR GAS SUPPLIER, CALL THE FIRE YOUR SAFETYWHAT TO DO IF YOU SMELL GAS7-2003 AAON 2 SECTION PAGE NUMBERGENERAL DESCRIPTION .. 03 UnpackingCertificationCodes and OrdinancesOWNER'S INFORMATION.

2 04 HEATING / COOLING SYSTEMS .. 05 INSTALLATION .. 06 Setting the Curb / Unit .. 07 Service ClearancesOutside Air 08 ElectricalGas 09 Condensate Piping .. 10 GAS UNIT LIGHTING INSTRUCTIONS .. 11 PERIODIC INSPECTION PROCEDURES .. 12 Gas Heating, Cooling, Electric, Steam, Hot Water & Chilled Water UnitsSERVICE, TROUBLE SHOOTING & MAINTENANCE .. 14 LubricationCleaningFILTER INSTALLATION / REPLACEMENT .. 15 SERVICING .. 16 Rooftop Unit Replacement Parts .. 18 SEQUENCE OF OPERATIONS .. 19 HeatingCoolingOptional EconomizerVAV Systems .. 20 Power Exhaust OptionsCOMPRESSOR CHECKOUT PROCEDURE .. 21 IGNITION CONTROL CHECKOUT PROCEDURE .. 22 FACTORY START-UP FORM .. 23 Owner should pay particular attention to the words: NOTE, CAUTION AND are intended to clarify or make the installation easier.

3 CAUTIONS are given to preventequipment damage. WARNINGS are given to alert owner that personal injury and/or equipmentdamage may result if installation procedure is not handled OF CONTENTSAAON It is the intent of AAON, Inc. to provide accurate and current specification information. However, in the interest of product improvement,AAON, Inc. reserves the right to change pricing, specifications and/or design of it's products without notice, obligation or liablity. 2003 AAON, Inc., all rights reserved throughout the & AAONAIRE are registered trademarks of AAON, Inc., Tulsa, (7-03)3 GENERAL DESCRIPTIONCERTIFICATION GAS HEAT MODELS(a)Design Certified as a forced air furnace with or without cooling unit.(b)Certified for outdoor installation only.(c)Certified for installation on combustible roof with a minimum of 12" high curb.

4 (d)Certified with heat exchanger located downstream from evaporator coil. STEAM OR HOT WATER HEAT MODELS(a)Certified as a forced air furnace with or without cooling unit.(b)Certified for outdoor installation only.(c)Certified for installation on combustible roof with a minimum of 12" high curb.(d)ARI certified hot water coils. ELECTRIC HEAT MODELS(a)Certified as an electric warm air furnace with or without cooling unit.(b)Certified for outdoor installation only.(c)Certified for installation on combustible roof with a minimum of 12" high curb. COOLING MODELS(a)Certified as a commercial central air-conditioner with or without electrically operated compressor.(b)Certified for outdoor installation only.(c)Certified for installation on combustible roof with a minimum of 12" high curb.(d)ARI certified units are designed as self-contained heating, coolingor combination units for outdoor installation only, usingthe refrigerant shown on the rating plate, chilled water,natural or propane gas, electric resistance, steam or received, the unit should be checked for damagethat might have occurred in transit.

5 If damage is found,it should be noted on the carrier's Freight Bill. A requestfor inspection by carrier's agent should be made inwriting at AND ORDINANCESS ystem should be sized in accordance with NationalWarm Air Heating and Air Conditioning AssociationLiterature, or the Guide of American Society of Heating,Refrigeration and Air Conditioning Engineers. Theinstallation must conform with local building codes or, inthe absence of local codes with (United States) NationalFuel Gas Code " ", (Canada) current CAN /CGA- or . 2. Installation Codes for Gas BurningAppliances and Equipment, current , Canadian Electrical Code Part 1, and B52 Mechanical Refrigeration Code, and LocalPlumbing or Waste Water ! WARNINGI mproper installation, adjustment, alteration,service or maintenance can cause propertydamage, personal injury or loss of and service must be performedby a qualified installer, service agencyor the gas : These units must not be used as a"construction heater" at any time during any phaseof construction.

6 Very low return air temperatures,harmful vapors, and misplacement of the filterswill damage the unit and its Clean Air Act of 1990 bans theintentional venting of refrigerant (CFC's andHCFC's) as of July 1, 1992. Approvedmethods of recovery, recycling or reclaimingmust be followed. Fines and/or incarcerationmay be levied for non-compliance.! IMPORTANT4 OWNER'S INFORMATIONWARNINGF ailure to observe the following instructions will resultin premature failure of your system, and possible void-ing of the EXPANSION (DX) COOLING UNITSN ever cut off the main power supply to the unit, exceptfor complete shutdown. When power is cut off from theunit, compressors with crankcase heaters cannot pre-vent refrigerant migration. The compressor will cooldown, and liquid refrigerant will accumulate in thecompressor.

7 The compressor is designed to pump onlyrefrigerant gas and damage may occur when power power must be cut off for more than an hour, turn thethermostat system switch to "OFF", and leave it off untilthe main power switch has been turned on again for atleast twenty four hours on units with compressor crank-case heaters. This will give the crankcase heater time toclear liquid accumulation out of the compressor before itis required to control the system from the thermostat, or con-trol panel, never at the main power supply (except in anemergency or complete shutdown of the system).During the cooling season, if the air flow is reduced dueto dirty air filters or other reasons, the cooling coils willget too cold and result in excessive liquid return to thecompressor. As the liquid concentration accumulates,oil is washed out of the compressor, leaving it starved compressors must be on a minimum of 4 minutesand off for a minimum of 5 minutes.

8 The cycle rate mustnot exceed 8 starts per COMPRESSOR LIFE WILL BE SERIOUSLYSHORTENED BY RESULTING REDUCED LUBRICA-TION, AND THE PUMPING OF EXCESS AMOUNTSOF liquid OIL AND OR ELECTRIC HEATINGThe system is designed to heat a given amount of air eachminute it operates. If the amount of air heated is greatlyreduced (approximately 1/3 capacity), the heat ex-changer / heater coil temperature will increase aboveacceptable level and result in shut down by a hightemperature safety switch incorporated either in theheat exchanger or the heater HEAT UNITS - WARNING: If, due to safety switchshut off or gas supply shut off failure; ALWAYS CLOSEMANUAL GAS VALVE TO UNIT PRIOR TO ANYELECTRICAL OVERHEATING OF THE HEATEXCHANGER WILL SHORTEN ITS : Improper installation, adjustment, alter-ation, service, or maintenance can cause property dam-age, personal injury or loss of life.

9 Installation andservice must be performed by a qualified installer, ser-vice agency or if gas fired units, the gas supplier. Referto installation instructions provided with the unit andthis : While the following incorrect operationsmay not cause damage to the system, they will impairthe performance, and may cause the built-in safetydevices to cut the system off LOW AMBIENT OPERATIONThe cooling section of a direct expansion (DX) unitwill not operate properly when the outdoor tempera-ture is below 55 F. Outside air intake options arenecessary if operation below 55 F is MULTIPLE UNIT OPERATIONWhen several units are used in conditioning thespace, and any are combination heating-coolingunits, all system thermostat switches must be set ateither heating, cooling, or set at "off". Do not runpart of a system switched to an opposite only units should be switched to "off" at thethermostat during the heating DIAGRAMSA complete set of unit specific wiring diagrams in bothladder and point-to-point form are laminated in plasticand located inside the control compartment PIPINGA drain trap is to be connected to the drainpan.

10 If codesrequire a condensate drain line, it should be the samepipe size as the drain nipple and should pitch downwardtoward condensate drain pipe ("P" trap) is factory suppliedand shipped in the control access compartment for fieldinstallation. An air break should be used with long runsof condensate ! WARNINGS croll compressors will be damaged byoperation with the wrong LOW PRESSURE SWITCH HAS BEENDISCONNECTED AFTER TESTINGAT THE wiring must be reconnected and properrotation determined at the time of start-up bya qualified service technician using suctionand discharge pressures alteration should only be made atthe unit power HEATING SYSTEMThe heating section is for use with natural gas supplypressure of 6" to " Water Column. The unit may alsoutilize propane gas with a supply pressure to the valveof 11" to 12" Water Column.