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Live steam hazard. If the Burner and the Pump stop at the same time, wait at least 15 minutes before starting the filter pump to avoid severe damage to the heater. PRESSURE RELIEF VALVE Canadian code requires and some U.S. local codes may require installation of a pressure relief valve. Purchase separately and install a 3/4” pressure relief valve complying with the ANSI/ASME Boiler and Pressure Vessel Code, having a capacity equal to the Btu/hr rating of the heater. The relief pressure of the valve MUST NOT EXCEED 50 PSI. A 3/4” NPT connection is provided in the manifold for installing a pressure relief valve. The relief valve must be installed vertically. To install the valve, use a 3/4” brass nipple and elbow (user supplied), as illustrated in Figure 20. No valve is allowed to be placed between the manifold adapter and the relief valve. Pipe relief valve discharge to a drain or other safe disposal site. 2681 1096 Relief Valve Installed User supplied pipe fittings Lower Pressure 2734 1296 CAN Raise Pressure Raise pressure set point if pressure switch is More than 2 feet (.6M) below water level Lower pressure set point if pressure switch is more than 5 feet (1.5M) above water level Back of pressure switch has a reference scale. FIGURE 20: Relief Valve FIGURE 19: Water Pressure Switch Adjustment FIGURE 18: Remove cover for access to Switch 19 To avoid water damage or scalding from operation of the relief valve, install a drain pipe in the outlet of the pressure relief valve that will direct water discharging from the valve to a safe place for disposal. Do not install any reducing couplings or valves in the drain pipe. The drain pipe must be installed so as to allow complete drainage from the valve and drain line. The relief valve should be tested at least once a year by lifting the valve lever. Explosion hazard. Any heater installed with restrictive devices in the piping system downstream from the heater (including check valves, isolation valves, flow nozzles, or therapeutic pool valving) must have a relief valve installed as described above. 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 21 (above). 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 top covers 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 21, above). 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 blowe...

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