Assessments - 2, GPA: 4
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WARNING Pipe relief valve discharge to a drain or other safe disposal site. 2681 1096 Relief Valve Installed User supplied pipe fittings Turn star wheel to raise pressure set point if pressure switch is more than 2 feet (0.6M) below water level FIGURE 19: Relief Valve FIGURE 18: Water Pressure Switch Adjustment Turn star wheel to lower pressure set point if pressure switch is more than 5 feet (1.5M) above water level Raise Pressure Lower Pressure A reference scale is on the back of pressure switch Star wheel Star wheel 19 Risk of fire and explosion. Improper installation, adjustment, alteration, service, or maintenance of the Combination Gas Control Valve can lead to fire or explosion, causing loss of life, personal injury, or property damage. These instructions are for the use of qualified service technicians only! Do not attempt this procedure unless you have been trained and certified in the care and repair of gas-fired appliances! Do not attempt this procedure if the following instructions are confusing! This appliance is equipped with an unconventional gas control valve that is factory set with a manifold pressure of –.2" (–0.5cm) wc. Installation or service must be performed by a qualified installer, service agency, or the gas supplier. If this control valve is replaced, it must be replaced with an identical control. The combination gas valve incorporates dual shut-off valves and a negative-pressure regulator. For proper operation, the regulated pressure at the outlet manifold of the valve must be 0.2" (0.5cm) wc below the reference pressure at the blower mixer inlet, and the gas valve ‘VENT’ tap must be connected to the endcap air orifice as shown in Figure 20. Do not attempt to adjust the gas input by adjusting the regulator setting. The correct gas regulator setting is required to maintain proper combustion and must not be altered. To check that the gas pressure setting is correct, use the following procedure: 1. Turn off the heater and remove the access door panels for access to the Combination Gas Control Valve. 2. Use a 3/16" hex key to remove the plug from the ‘PRESSURE TAP’ port on the outlet side of the Combination Gas Control Valve. 3. Install a 1/8" NPT barbed fitting into the ‘PRESSURE TAP’ port. Use a flexible tube to connect it to the low side of a differential pressure gauge or a slope gauge. NOTICE: If you are using a slope gauge or a differential pressure gauge of less than 3" capacity, close the shutoff valve of the gauge to avoid pulling the liquid out of the gauge when the blower starts. 4. Disconnect the tube from the Gas Valve ‘VENT’ port. Connect it to a tube with a tee running to the high side of a differential pressure gauge and to the blower’s air orifice grille (See Figure 20). 5. Turn on the heater and verify the gas supply pressure (Page 20). 6. After the burner ignites, open the shutoff valve of the gauge. The pressure gauge should then read 0.2" wc ±0.1" wc (0.5cm wc ± 0.25cm wc) (0.0" to 0.1" wc (0.0 to 0.2 cm) = rich mixture; 0.3" (.75 cm) and above = lean mixture). (Since the pressure tap is connected to the low side of the gauge, the pressure is actually negative.) Risk of fire or explosion if Combination Gas Control Valve is incorrectly adjusted. If it is necessary to adjust the gas valve, this must be done only by a qualified service agency. 7. Turn off the heater. 8. Replace the plastic hose between the ‘VENT’ port and the inlet of blower mixer. Remove the barbed fitting and replace the plug in the ‘PRESSURE TAP’ port of the gas valve, using a thread sealant approved for use with natural gas and propane. 9. Replace the access door panels and cycle the heater to check for proper operation. WARNING WARNING Instructions For Checking the Gas Pressure Through the Combination Gas Control Valve FIGURE 20: Connect Gas Valve to End Cap Air Orifice NOTE: The gas piping and unions have been omitted for clarity; make this test with all gas piping connected (as for normal service). To High Side of Differential Pressure Gauge To Low Side of Differential Pressure Gauge To Air Flow Switch Connection for Test To Gas Valve Vent Pressure Tap Vent Connection for Service To Gas Valve Vent To Air Flow Switch GAS CONNECTIONS The heater requires a gas supply of not less than 4" (10.2cm) wc and not more than 14" (35.6cm) wc. Gas supply pressures outside of this range may result in improper burner operation. A minimum flowing or dynamic inlet pressure of 4" (10.2cm) wc is required to maintain input rating. The gas supply must be installed in accordance with the National Fuel Gas Code, ANSI Z223.1, or standard CSA B149.1, Natural Gas and Propane Installation Codes, as applicable and all applicable local codes. Install a manual shut-off valve and a sed iment trap and union located outside the heater panels (Figure 21). Do not use a restrictive gas cock. The following minimum gas pipe sizes are recommended for natural gas supply piping. For low pressure LP gas, pipe size may be reduced by 1/4...
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