Desa FLAME-MAX VML27PR Owner's Operation And Installation Manual

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Desa FLAME-MAX VML27PR Owner's Operation And Installation Manual Manual pdf 12 page image

111115-01D12For more information, visit www.desatech.comFor more information, visit www.desatech.comWARNING: Test all gas piping and connections,internal and external to unit, for leaks after installingor servicing. Correct all leaks at once.CHECKING GAS CONNECTIONSPressure Testing Gas Supply Piping SystemTest Pressures In Excess Of 1/2 PSIG (3.5 kPa)1. Disconnect appliance with its appliance main gas valve (controlvalve) and equipment shutoff valve from gas supply piping sys-tem. Pressures in excess of 1/2 psig will damage heater regulator.2. Cap off open end of gas pipe where equipment shutoff valvewas connected.3. Pressurize supply piping system by either opening propane/LP sup-ply tank valve for propane/LP gas, or opening main gas valve lo-cated on or near gas meter for natural gas, or using compressed air.WARNING: Never use an open flame to check fora leak. Apply a noncorrosive leak detection fluid toall joints. Bubbles forming show a leak. Correct allleaks at once.CAUTION: For propane/LP gas, make sure exter-nal regulator has been installed between propane/LPsupply and heater. See guidelines underConnectingto Gas Supply, pages 11 and 12.INSTALLATIONContinuedInstallation must include an equipment shutoff valve, union, andplugged 1/8" NPT tap. Locate NPT tap within reach for test gauge hookup. NPT tap must be upstream from heater (see Figure 19).IMPORTANT: Install equipment shutoff valve in an accessiblelocation. The equipment shutoff valve is for turning on or shuttingoff the gas to the appliance.Check your building codes for any special requirements for locatingequipment shutoff valve to fireplaces.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.Figure 18 - External Regulator With Vent Pointing Down (pro-pane/LP gas only)Propane/LPSupply TankExternalRegulatorVentPointingDownWe recommend that you install sediment trap in supply line asshown in Figure 19. Locate sediment trap where it is within reach forcleaning. Install in piping system between fuel supply and heater.Locate sediment trap where trapped matter is not likely to freeze. Asediment trap traps moisture and contaminants. This keeps themfrom going into heater controls. If sediment trap is not installed oris installed wrong, heater may not run properly.CAUTION: Avoid damage to control. Hold fittingwith wrench when connecting it to gas piping and/orfittings.* Purchase the optional CSA design-certified equipment shutoffvalve from your dealer. See Accessories, page 27.** Minimum inlet pressure for purpose of input adjustment.Figure 19 - Gas ConnectionGas Control3" MinimumCSA Design-Certified EquipmentShutoff Valve With1/8" NPT Tap*Approved FlexibleGas Hose (if allowedby local codes)TeeJointPipeNippleCapSedimentTrapNatural GasFrom Gas Meter(5" W.C.** to 10.5"W.C. Pressure)Propane/LP GasFrom ExternalRegulator (11"W.C.** to 14" W.C.Pressure)INSTALLATIONConnecting To Gas Supply (Cont.)Checking Gas Connections