Mechanical · M-HZEVV

Glycol Make-Up System and Venturi Installation Detail

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The glycol make-up system includes a translucent poly mixing tank on a steel frame support, a make-up pump, an expansion tank, and a control panel with pump start, pump stop, pump light on, and tank low level light indicators. A low level switch in the mixing tank energizes remote alarm contacts and indicates when the level drops below one-quarter full. The cold water supply features a one-inch line with an air gap with a plain end. The pump discharge connects to an expansion tank and routes toward pump suction with high and low pressure switches and pressure indicator monitoring. A separate detail specifies venturi installation requirements, mandating a minimum of seven pipe diameters of straight pipe distance upstream and four pipe diameters downstream for valid pressure drop readings, with the venturi installed to allow unobstructed access to the read-out hose attachment.

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