Air Conditioning and Refrigeration, Second Edition by Rex Miller & Mark R. Miller

Author:Rex Miller & Mark R. Miller [Miller, Rex]
Language: eng
Format: mobi
Tags: Science & Technical
ISBN: 9780071761406
Publisher: McGraw-Hill Education
Published: 2011-09-04T16:00:00+00:00

Flooded Floor-Type Blower (Gas- and Liquid-Leg Shutoff)

Figure 10-18 illustrates a flooded floor unit suitable for operation down to −70°F (−57°C).

The gas-pressure-powered valve used in this circuit has a solenoid pilot operator. This provides positive action with gas or liquid loads at high or low temperatures and pressures.

To defrost a group of evaporators without affecting the temperatures of the common surge drum, the gaspowered valve is used in each end of the evaporator. A reseating safety valve is a relief regulator. It controls the defrost pressure to the relief line accumulator. A check valve prevents back flow into the relief line. The in-line check valve prevents crossover between adjacent evaporators.

At high temperatures [above −25°F (−31°C)], use of the gas-powered check valve in place of the gas-powered solenoid valve is recommended.

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