Nature Air RGRM-04*MAES Installation Instructions Manual
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38NEVER PURGE A GAS LINE INTOTHE COMBUSTION CHAMBER.NEVER USE MATCHES, FLAME ORANY IGNITION SOURCE FORCHECKING LEAKAGE. FAILURE TOADHERE TO THIS WARNING CANCAUSE A FIRE OR EXPLOSIONRESULTING IN PROPERTYDAMAGE, PERSONAL INJURY ORDEATH.To check for gas leakage, use anapproved chloride-free soap and watersolution, or other approved method.supply on or off. Install a drip leg inthe gas supply line as close to thefurnace as possible. Always use apipe compound resistant to the actionof liquefied petroleum gases on allthreaded connections.IMPORTANT: When making gas pipeconnections, use a back-up wrench toprevent any twisting of the main gasvalve and manifold. Do notovertighten gas valve on pipe.Any strains on the gas valve canchange the position of the gas orificesin the burners. This can cause erraticfurnace operation.IMPORTANT: Do not run a flexiblegas connector inside the furnace. Thegas pipe gasket in the cabinet doesnot seal around a flexible gas line.If local codes allow the use of aflexible gas appliance connector,always use a new listed connector.Do not use a connector which haspreviously serviced another gasappliance. Massachusetts lawrequires that all flexible connectors beless than 36”.It is important to have all openingsin the cabinet burner compartmentsealed for proper furnaceoperation.IMPORTANT: ENSURE that thefurnace gas valve not be subjected tohigh gas line supply pressures.DISCONNECT the furnace and itsindividual manual gas stop from thegas supply piping during anypressure testing that exceeds 1/2PSIG. (3.48 kPa).GAS PRESSURENatural gas supply pressure shouldbe 5" to 10.5" w.c. LP gas supplypressure should be 11" to 13" w.c.This pressure must be maintainedwith all other gas-fired appliancesin operation.The minimum gas supply pressure tothe gas valve for proper furnace inputadjustments is 5" w.c. for natural gas,however 6" to 7" is recommended.The minimum gas supply pressure is11" w.c. for LP gas.ELEVATIONS ABOVE 2000 FTREQUIRE THAT THE FURNACEINPUT RATING BE ADJUSTED ANDTHAT THE SIZE OF THE BURNERORIFICES BE RE-CALCULATEDBASED ON ELEVATION AND GASHEATING VALUE. THE BURNERORIFICES MAY (OR MAY NOT)NEED TO BE CHANGED. SEE THESECTION TITLED “HIGH ALTITUDEINSTALLATIONS” OF THIS BOOKFOR INSTRUCTIONS.! WARNINGTABLE 5NATURAL GAS PIPE CAPACITY TABLE (CU. FT./HR.)Capacity of gas pipe of different diameters and lengths in cu. ft. per hr. with pressure drop of 0.3 in. and specificgravity of 0.60 (natural gas).Nominal Length of Pipe, FeetIron PipeSize, Inches 10 20 30 40 50 60 70 801/2 132 92 73 63 56 50 46 433/4 278 190 152 130 115 105 96 901 520 350 285 245 215 195 180 1701-1/4 1,050 730 590 500 440 400 370 3501-1/2 1,600 1,100 890 760 670 610 560 530After the length of pipe has been determined, select the pipe size which will provide the minimum cubic feet per hourrequired for the gas input rating of the furnace. By formula:Gas Input of Furnace (BTU/HR)Cu. Ft. Per Hr. Required = Heating Value of Gas (BTU/FT3)The gas input of the furnace is marked on the furnace rating plate. The heating value of the gas (BTU/FT3) may bedetermined by consulting the local natural gas utility or the LP gas supplier.GAS VALVEThis furnace has a 24-volt gas valve.It has ports for measuring supply andmanifold gas pressure. The valvebody contains a pressure regulator tomaintain proper manifold gaspressure.A control switch is on the valve body.It can be set to only the “ON” or“OFF” positions. The gas valve is aslow-opening valve. See Figures 36and 38.When energized, it takes 6 to 8seconds to fully open.CAUTION!FIGURE 36TYPICAL GAS VALVE (WHITE RODGERS)INLETPRESSURE TAPOUTLETPRESSURETAPHIGH FIREMANIFOLDPRESSUREADJUSTMENTLOW FIREPRESSUREMANIFOLDADJUSTMENT |
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