Raypak 751 Water Piping, General, Relief Valve Piping, Hydrostatic Test, Low Temperature System

of 1 million BTUH. This opening(s) shall be either located at or ducted to a point neither more than 18 inches (450 mm) nor less than 6 inches (150

mm)above the floor level. The duct can also "Goose Neck" through the roof. The duct is pre- ferred straight down 18 inches from floor, but do not place near piping. This air supply opening requirement shall be in addition to the air opening for ventilation air required in (1).

3.When air supply is provided by natural air flow from outdoors for a power burner and there is no draft regulator, draft hood or similar flue gas dilu- tion device installed in the same space, in addition to the opening for ventilation air required in (1), there shall be a permanent air supply opening(s) having a total cross-sectional area of not less than 1 sq. in. for each 30,000 BTUH (70 sq. mm per kW) of total rated input of the burner(s), and the location of the opening(s) shall not interfere with the intended purpose of the opening(s) for ventila- tion air referred to (1). This opening(s) can be ducted to a point neither more than 18 inches (450

mm)nor less than 6 inches (150 mm) above the floor level. The duct can also "Goose Neck" through the roof. The duct is preferred to be straight down 18 inches from floor, but do not place near piping.

4.Refer to the latest version of CSA B149 for addi- tional information.

WATER PIPING

General

The boiler should be located so that any water leaks will not cause damage to the adjacent area or struc- tures.

All units should be plumbed in accordance with the appropriate diagram from the following sections or per a suitable engineered piping arrangement.

CAUTION: This boiler requires forced water circulation when the burner is operating. See Table E for minimum and maximum flow rates and water pump selection. The pump must be interlocked with the boiler to prevent boiler operation without water circulation.

Relief Valve Piping

WARNING: Pressure relief valve discharge piping must be piped near the floor close to a floor drain to eliminate the potential of severe burns. Do not pipe to any area where freezing could occur. Refer to local codes.

Hydrostatic Test

Unlike many other types of boilers, Raypak boilers do not require hydrostatic testing prior to being placed in operation. The heat exchanger has already been fac- tory-tested and is rated for 160 PSI operating pressure. However, Raypak does recommend hydro- statically testing the piping connections to the boiler and the rest of the system prior to operation. This is particularly true for hydronic systems using expensive glycol-based antifreeze. Raypak recommends con- ducting the hydrostatic test before connecting gas piping or electrical supply.

Leaks must be repaired at once to prevent damage to the boiler. NEVER use petroleum-based stop-leak compounds.

1.Connect fill water supply. Fill boiler with water (be sure bleed valve is open). When water flows from bleed valve, shut off water. Close bleed valve. Carefully fill the rest of the system, being sure to eliminate any entrapped air by using high point vents. Close feed valve. TEST AT standard oper- ating pressure for at least 24 hours.

2.Make sure constant gauge pressure has been maintained throughout test.

3.Check for leaks. Repair if found.

Low Temperature System

Boiler requires minimum inlet temperature of 105°F. Consult the following sections for piping details. (For Pool temperature requirements, See the Pool Heating Section).

Temperature & Pressure Gauge

The temperature and pressure gauge is factory- mounted in the inlet/outlet header.

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