Viking ESFR Service Manual download pdf (Page 15)

solution above freezing for air below the primary check valve. Due to

difficulty in servicing and insulating the check valve, it is recommended to

install the deluge and check valve near floor level at the base of the main

riser in the heated area allowing approximately 1 to 2 ft between the

outlet of deluge valve and inlet of the primary Easy Riser

Check Valve

and install the maximum length of pipe from the primary Easy Riser

Check Valve to the Isolation check valve that is between the freezer wall

and the primary check valve.

Air vent valves or manual bleed valves must be installed at the highest

and most remote points on the tree piping system in order to vent out all

air during fill of the 35% or 50% premix of propylene glycol/water solution

in the system. Additional vent or bleed valves shall be installed on the end

of each branch line at high points and feed mains at high points to ensure

air is vented from the system. This is required in order to eliminate

compressible gas (air) from the system when setting supervisory pressure

from the antifreeze CS-1 pump system. Also, the manual vent valves may

be used for multiple sample points of the system for quality testing of the

antifreeze solution. The Viking Model AV-1 Automatic Air/Vent Valve is

recommended for this use. It automatically vents air during fill and breaks

the vacuum for faster drainage of the system when performing

maintenance or draining the system after operation.

AV-1 Air Vent Assembly

5.1.1.1 General Piping and Material Recommendations

• In order to prevent leaks and preserve the antifreeze

solution, it is imperative that grooved pipe ends are smooth,

round, and free of burrs, flat spots, and weld seam

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Viking ESFR Service Manual Page 15