QUICKDRAW→ Boiler Water Heater

WATER INLET / OUTLET CONNECTIONS

Important: Do not use galvanized or steel pipe nipples when making waterside connections. Use non-ferrous nipples only.

Make inlet and outlet water connections directly to the threaded bolt-on bronze tank flanges. Over tightening connections to the flanges may cause damage to the flange or tank and are not covered by warranty. For ease of service, install unions on inlet and outlet piping to the unit. Do not use galvanized nipples to make tank connections as these will cause corrosion and rust. Piping and components connected to the water heater must be suitable for potable water, for the water temperatures they will experience and for their application.

CAUTION: Flush all water supply lines before connecting the unit.

FILLING THE UNIT

1.Fill the system with water. To be sure that the unit is not “air bound,” open the relief valve. Leave the valve open until a steady flow of water is observed. Close valve and complete filling the system.

2.In hard water areas, potable water treatment should be used to reduce introduction of minerals into the system. Minerals in the water can collect on the tubes and heat-exchanger surfaces reducing the life of the product. Heat exchanger failure due to scale accumulation is not covered by the product warranty.

3.Make sure there are no system leaks. DO NOT use petroleum based stop-leak products. All system leaks must be repaired.

RELIEF VALVE PIPING

The water heater is supplied with a pressure and temperature relief valve, sized in accordance with ASME requirements. Each relief valve should be piped to a suitable floor drain. No reducing coupling or other restriction can be installed in the discharge line. It is strongly recommended that this valve should be manually operating at least once a year.

WARNING: Make sure the safety relief valve is piped to a proper drain per instructions. Scalding injury and/or water damage can occur from either the manual lifting of the lever or the normal operation of the valve if it is not piped to a proper drain. Insure that the safety relief valve piping is of the proper material and rating for the temperature and pressure of the system and that it is secured to prevent possible injury. If the valve fails to flow water or reseat, consult factory. The relief valve is a primary safety device.

SEQUENCE OF OPERATION (Refer to figure on page 7)

1.When power is supplied through the unit’s On-Off switch, if the stored water temperature is below the operating thermostat set point, the limit operating circuit closes creating a call-for-heat-demand, which energizes the actuator on the three-way mixing valve.

2.The three-way mixing valve returns circulating boiler water to the boiler supply loop through its bypass ports. On a call-for heat, the actuator motor runs and the actuator shaft extends causing the valve to divert the boiler water through the heat exchanger before it is returned to the boiler supply loop.

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