PipeHot Gas Defrost, Sqe/Sbf | Heatcraft Refrigeration Products BN-LOPTB

3-Pipe Hot Gas Defrost

The hot gas defrost unit coolers conforms to the standard 3-pipe hot gas system using a check

valve assembly, an electrical control to terminate the defrost, and a hot gas solenoid valve. The

check valve assembly transports the hot gas between the drain pan loop and the sideport distributor of the coil. The check valve assembly kit

is available for shipped-loose or factory-installed for an additional cost.

The electrical control option includes an adjustable defrost termination and fan delay control (DTFD) which is standard. An optional

(2) control electrical system is available with one adjustable control for defrost termination (DT)

and one fixed control for the fan delay (FD) for an additional cost. For both the DTFD and DT adjustable controls, the remote bulb position is

with the bulb strapped to the suction line to insure a complete defrost. The remote bulb is positioned

by the installer. The hot gas solenoid valve must be

ordered separately and will be shipped-loose. The thermostatic expansion valve could be ordered separately and shipped- loose or the thermostatic expansion valve could be factory-installed with a liquid line for an additional cost.

The liquid line is designed for the body styles of the Sporlan SQE, SBF, EG and the Alco HFESC thermostatic expansion valves. The thermostatic expansion valve needs to be selected by the sales engineer. In a typical 3-pipe, multiple evaporator system, the compressor discharge defrosts the evaporator. The liquid/vapor mixture of refrigerant after defrost, however, returns to the common suction line of the system. In order to provide sufficient re-evaporation of the liquid vapor mixture and sufficient heat for defrost, no more than one-third of the system should be defrosted at one time. Some means of control in the 3-pipe hot gas system should be supplied to regulate the large amount of liquid returning to the compressor, refrigerant slugging can otherwise damage the compressor.

HGT 6 FPI

	Shipped-loose			Factory-installed
	TXV Liquid Line			TXV Liquid Line
SQE/SBF	EG	HFESC	SQE/SBF	EG	HFESC

035-075

090-160

180-280

50169410

50169411

50169412

50169413

50169414

50169415

50169416

50169417

50169418

52733901

52733902

52733903

52733904

52733905

52733906

52733907

52733908

52733909

HGT 4 FPI

041-080

102-204

235