Design Dynamics VF-18N-EMU Owner's Operation And Installation Manual

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Design Dynamics VF-18N-EMU Owner's Operation And Installation Manual Manual pdf 11 page image

111826-05For more information, visit www.desatech.com1111INSTALLATIONContinuedINSTALLATIONInstalling Heater Assembly (Cont.)Connecting to Gas SupplyWARNING: This appliance requires a 3/8" NPT(National Pipe Thread) inlet connection to the pres-sure regulator.WARNING: A qualified service person must con-nect heater to gas supply. Follow all local codes.CAUTION: Never connect propane/LP fireplacedirectly to the propane/LP supply.This heater requiresan external regulator (not supplied). Install the ex-ternal regulator between the heater and propane/LPsupply.WARNING: Never connect natural gas fireplace toprivate (non-utility) gas wells. This gas is commonlyknown as wellhead gas.Installation Items NeededBefore installing heater, make sure you have the items listed be-low.• external regulator (supplied by installer)• piping (check local codes)• sealant (resistant to propane/LP gas)• equipment shutoff valve *• test gauge connection *• sediment trap• tee joint• pipe wrench• approved flexible gas line with gas connector (if allowed by localcodes) (provided)* A CSA design-certified equipment shutoff valve with 1/8" NPTtap is an acceptable alternative to test gauge connection. Purchasethe optional CSA design-certified equipment shutoff valve fromyour dealer. See Accessories, page 27.For propane/LP units, the installer must supply an external regu-lator. The external regulator will reduce incoming gas pressure. Youmust reduce incoming gas pressure to between 11 and 14 inches ofwater. If you do not reduce incoming gas pressure, heater regulatordamage could occur. Install external regulator with the vent point-ing down as shown in Figure 12. Pointing the vent down protectsit from freezing rain or sleet.CAUTION: Use only new, black iron or steel pipe.Internally-tinned copper tubing may be used in cer-tain areas. Check your local codes. Use pipe of 1/2"diameter or greater to allow proper gas volume toheater. If pipe is too small, undue loss of volume willoccur.CONNECTING TO GAS SUPPLYInstallation must include an equipment shutoff valve, union, andplugged 1/8" NPT tap. Locate NPT tap within reach for test gaugehook up. NPT tap must be upstream from heater (see Figure 13page 12, depending on your model).IMPORTANT: Install equipment shutoff valve in an accessiblelocation. The equipment shutoff valve is for turning on or shuttingoff the gas to the appliance.Apply pipe joint sealant lightly to male NPT threads. This willprevent excess sealant from going into pipe. Excess sealant in pipecould result in clogged heater valves.WARNING: Use pipe joint sealant that is resistantto liquid petroleum (LP) gas.We recommend that you install a sediment trap in supply line asshown in Figure 13 page 12, depending on your model. Locatesediment trap where it is within reach for cleaning. Install in pip-ing system between fuel supply and heater. Locate sediment trapwhere trapped matter is not likely to freeze. A sediment trap trapsmoisture and contaminants. This keeps them from going into heatercontrols. If sediment trap is not installed or is installed wrong, heatermay not run properly.CAUTION: Avoid damage to gas control. Hold gascontrol with wrench when connecting it to gas pipingand/or fittings.Control Valve to Supply Tank-Vanguard BT GRH/PV 019BPropane/LPSupply TankExternal RegulatorFigure 12 - External Regulator With Vent Pointing DownVent Pointing Down