Desa VYM27NRPR Owner's Operation And Installation Manual

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Desa VYM27NRPR Owner's Operation And Installation Manual Manual pdf 12 page image

110398-01AFor more information, visit www.desatech.comFor more information, visit www.desatech.com12INSTALLATIONConnecting To Gas Supply (Cont.)Checking Gas ConnectionsINSTALLATIONContinuedWe recommend that you install sediment trap in supply line asshown in Figure 14. 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 24.** Minimum inlet pressure for purpose of input adjustment.Figure 14 - Gas ConnectionGas Control3" MinimumCSA Design-CertifiedEquipment Shutoff ValveWith 1/8" NPT Tap*Approved FlexibleGas Hose (if allowedby local codes)Cap Pipe TeeNipple JointSediment TrapNatural GasFrom Gas Meter (5"W.C.** to 10.5" W.C.Pressure)Propane/LP GasFrom ExternalRegulator(11" W.C.** to 14"W.C. Pressure)WARNING: Test all gas piping and connectionsfor leaks after installing or servicing. Correct all leaksat once.CHECKING GAS CONNECTIONSWARNING: Never use an open flame to check fora leak. Apply a noncorrosive leak detection fluid to alljoints. Bubbles forming show a leak. Correct all leaksat once.CAUTION: For propane/LP gas, make sure exter-nal regulator has been installed between propane/LPsupply and heater. See guidelines underConnectingto Gas Supply, page 11.Pressure Testing Gas Supply Piping SystemTest Pressures In Excess Of 1/2 PSIG (3.5 kPa)1. Disconnect appliance with its appliance main gas valve (con-trol valve) and equipment shutoff valve from gas supply pip-ing system. Pressures in excess of 1/2 psig will damage heaterregulator.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.4. Check all joints of gas supply piping system. Apply a noncorrosiveleak detection fluid to gas joints. Bubbles forming show a leak.5. Correct all leaks at once.6. Reconnect heater and equipment shutoff valve to gas supply.Check reconnected fittings for leaks.Test Pressures Equal To or Less Than 1/2 PSIG (3.5 kPa)1. Close equipment shutoff valve (see Figure 15).2. 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.3. Check all joints from propane/LP supply tank to equipmentshutoff valve (see Figure 15). Apply a noncorrosive leak de-tection fluid to gas joints. Bubbles forming show a leak.4. Correct all leaks at once.Pressure Testing Heater Gas Connections1. Open equipment shutoff valve (see Figure 15, page 12).2. Open main gas valve located on or near gas meter for naturalgas or open propane/LP supply tank valve.3. Make sure control knob of heater is in the OFF position.4. Check all joints from equipment shutoff valve to control valve(see Figure 16 or 17, page 13). Apply a noncorrosive leak de-tection fluid to gas joints. Bubbles forming show a leak.5. Correct all leaks at once.6. Light heater (see Operating Heater, pages 14 through 16).Check all other internal joints for leaks.7. Turn off heater (see To Turn Off Gas to Appliance, page 15).ONPOSITIONOFFPOSITIONFigure 15 - Equipment Shutoff ValveOpenClosedEquipmentShutoffValve