Raypak Xtherm 1505A Installation & Operating Instructions Manual

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21Gas SupplyGas piping must have a sediment trap ahead of theheater gas controls, and a manual shut-off valve lo-cated outside the heater jacket. It is recommendedthat a union be installed in the gas supply piping adja-cent to the heater for servicing. The gas supplypressure to the heater must not exceed 10.5 in. WC fornatural gas or 13.0 in. WC for propane gas. A pounds-to-inches regulator must be installed to reduce the gassupply pressure if it is higher than noted above. Thisregulator should be placed a minimum distance of 10times the pipe diameter upstream of the heater gascontrols. Refer to Table H for maximum pipe lengths.Gas Supply ConnectionThe heater must be isolated from the gas supply pip-ing system by closing the upstream manual shut-offvalve during any pressure testing of the gas supplypiping system at test pressures equal to or less than1/2 psi (3.45 kPa). Relieve test pressure in the gassupply line prior to re-connecting the heater and itsmanual shut-off valve to the gas supply line. FAILURETO FOLLOW THIS PROCEDURE MAY DAMAGETHE GAS VALVE. Over-pressurized gas valves arenot covered by warranty. The heater and its gas con-nections shall be leak-tested before placing theappliance in operation. Use soapy water for leak test.DO NOT use an open flame.DANGER: Make sure the gas on which the heaterwill operate is the same type as specified on theheater’s rating plate.CAUTION: The heater must be disconnected fromthe gas supply during any pressure testing of the gassupply system at test pressures in excess of 1/2 psi(3.45 kPa).Gas Supply PressureA minimum of 4.0 in. WC upstream gas pressureunder full load and a maximum gas supply pressuresetpoint of 10.5 in. WC under load and no-load condi-tions for natural gas. A minimum of 4.0 in. WCupstream gas pressure under full load and a maximumgas supply pressure setpoint of 13.0 in. WC is requiredfor propane gas. The gas pressure regulator(s) sup-plied on the heater is for low-pressure service. Ifupstream pressure exceeds 1/2 psi at any time, anintermediate gas pressure regulator, of the lockuptype, must be installed. This regulator should beplaced a minimum distance of 10 times the pipe diam-eter upstream of the heater gas controls.When connecting additional gas utilization equipmentto the gas piping system, the existing piping must bechecked to determine if it has adequate capacity forthe combined load.The gas valve pressure regulator on the heater isnominally preset as noted in Table I.During normal operation, carbon dioxide should be9.0% ± 0.2% at full fire for natural gas and10.2% ± 0.2% for propane gas. Carbon monoxideshould be ‹100ppm.Fig. 19: Gas Supply ConnectionCAUTION: Do not use Teflon tape on gas line pipethread. A pipe compound rated for use with naturaland propane gases is recommended. Applysparingly only on male pipe ends, leaving the twoend threads bare.CAUTION: Support gas supply piping withhangers, not by the heater or its accessories. Makesure the gas piping is protected from physicaldamage and freezing, where required.CAUTION: For proper operation, no more than a30% drop in gas supply pressure from no-load to full-load conditions is acceptable. Under nocircumstances should the pressure be outside thelisted operational range.