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operation <br /> CAUTION 3/4" to 1" <br /> Start-up and adjustment procedures should be performed <br /> by a qualified serviceman. <br /> Gas pressure to unit heater controls must never exceed <br /> 14" W.C. When air pressure testing piping systems for <br /> leaks,be sure that test pressure does not exceed 14"W.C. % 3re" to 112" <br /> if unit heaters are already installed.Check the gas supply + <br /> pressure at the unit upstream from the pressure regulator. <br /> For the purpose of input adjustment,the minimum supply Thermocouple <br /> pressure should be 6"W.C.on natural gas br 11"W.C.on <br /> propane. The maximum inlet pressure on natural gas r <br /> should be 7" W.C. and 14" W.C. on propane. The pilot !� <br /> flame must be adjusted as described on page 9. Supply <br /> pressure with any gas must never exceed 14"W.C.;if so, <br /> install an additional pressure regulator upstream of the <br /> combination gas valve.Purging of air from gas lines,pip- <br /> ing, and lighting the'pilot should be performed as de- <br /> scribed in ANSI Z223.1,— Latest Edition "National Fuel <br /> Gas Code" (CAN/CGA-B149 in Canada). <br /> Be sure no obstructions block draft diverter or air intake <br /> and discharge of unit heater. Figure 7 <br /> Correct pilot flame <br /> Normally, this flame will produce satisfactory thermocouple <br /> PRIOR TO OPERATION output.To adjust flame,use pilot adjustment screw on control <br /> Although this unit has been assembled and fire-tested at the valve. If the pilot flame is longer and larger than shown by <br /> factory,the following pre-operational procedures should be Figure 7 it is quite possible that it will impinge on the heat <br /> performed to assure proper on-site operation: exchanger header causing burnout. If line pressures higher <br /> 1. Ensure that the electricity supply is off. than 6"-7"W.C.on natural gas are anticipated or experienced, <br /> 2. Check burner(s) to insure proper alignment. it is recommended that a pressure regulator be installed upstream <br /> of the unit heater gas control valve.A short flame,while pressure <br /> 3. Check fan clearance. Fan should not contact casing is constant,indicates a dirty pilot orifice or pilot valve.A weak <br /> when spun by hand. pilot flame causes poor burner ignition and can reduce ther- <br /> 4. Check all electrical connections to be sure they are mocouple output enough to shut off gas supple. Pilot flame <br /> secure. condition should be observed periodically to assure trouble- <br /> 5. Check that all horizontal deflector blades are open a free operation. <br /> minimum of 30' as measured from vertical. <br /> MANUAL MAIN GAS VALVE <br /> LIGHTING INSTRUCTIONS(ALSO ON UNIT) (ALSO MANUAL PILOT VALVE AND SAFETY RESET FOR STANDING PILOT) <br /> For Unit w/Standing Pilot <br /> DEPRESS TO RELIGHT <br /> 1. Turn off power. Turn thermostat down. Close manual STANDING PILOT <br /> main gas valve and wait 5 minutes. <br /> 2. Open manual pilot valve.Depress safety reset while light- ELECTRICAL <br /> CONNECTION <br /> ing and hold for 1 minute. TERMINALS <br /> � ,` <br /> 3. Open manual main gas valve.Turn on power.Set ther- <br /> INLET <br /> mostat at desired setting. <br /> Wa.• <br /> For Unit w/Intermittent Pilot ' <br /> 1. Turn off power. Turn thermostat down. Close manual <br /> •• v PRESSURE <br /> main gas valves and wait 5 minutes. r' REGULATOR <br /> 2. Open all gas valves.Turn on power. xA ADJUSTMENT <br /> 3. Set thermostat at desired setting.(Pilot and main burner PILOT LI i <br /> will light automatically when thermostat calls for heat). <br /> CONNECTION <br /> Shut Down Instructions MANIFOLD ` <br /> Turn off power and close all gas valves. PREssuRE TAP <br /> AFTER INITIAL START UP OUTLET Figure 8 <br /> 1. Check pilot flame adjustment as shown below. Typical gas valve <br /> 2. Check gas piping for leaks with a soap bubble solution to <br /> insure safe operation. <br /> 3. Check gas input rate, as described on next page, to <br /> assure adequate gas volume and pressure. NATURAL GAS FLAME CONTROL <br /> PILOT FLAME ADJUSTMENT Control of burner flames on unit heaters utilizing natural gas <br /> The pilot is orif iced to burn properly with an inlet pressure of is achieved by resetting the gas manifold to either increase or <br /> 6"-7"W.C.on natural gas and 11"-14"on propane gas,but its decrease primary combustion air.Prior to flame adjustment, <br /> pressure cannot be easily measured.Therefore,adjust pilot operate unit with casing bottom closed for about fifteen min- <br /> valve to give a soft steady flame 3/4"to 1" long and encom- utes.Operation can be viewed after loosening and pushing <br /> passing%"to 1/2'of the tip of the thermocouple. aside the blue gas designation disc on rear of unit. <br /> Page 9 <br />