30 Hour Dial

The unit defrost is controlled by a timer in the control box. After removing the condenser grille, the control box will slide out until the defrost timer is visible. The factory set defrost is two times in 24 hours with a maximum timed interval of 30 minutes. The unit contains a defrost termination sensor so in actual use the defrost time will be less than 30 minutes in most cases. The timer can be converted to operate for a timed defrost termination by disconnecting the blue/white from the X terminal. NOTE: When disconnected, it is recommended that the terminal be cut off of the blue/white wire and the wire end be capped with a wire nut.

The defrost time is set by switching a white key from the center to the outside edge of the dial. Each key is 15 minutes so two successive keys must be switched outward for a 30 minute maximum time defrost. If it is noted that more defrost time is needed, then switch outward the third successive key for a 45-minute maximum timed defrost. If another defrost in 24 hours

is needed then more keys can be switched outward as needed. If possible, try to keep defrosts evenly spaced in

a 24 hour period.

30 Hour Dial

Pointer

The current time can be set by turning the outer dial in the direction of the arrow until the correct clock time is shown and the small arrow aligns with either the AM or PM scale.

NOTE: The cabinet serial number for the GT is on the data plate located on the end opposite the condensing unit.

REFRIGERATION SYSTEM AND OPERATION

The cabinet utilizes a Hermetic compressor and operates with refrigerant 404A. Cabinet operates on 115/60/1 power. The cabinet has a bare tube type condenser, which virtually eliminates the possibility of condenser blockage by dust and dirt.

The cabinet operates with a specific charge of refrigerant 404A. The amount of the charge of refrigerant is listed on the cabinet nameplate in ounces. These systems use one or two captubes to meter refrigerant to the evaporator. They include automatic electric defrost systems which are time initiated (by the timeclock) and terminated by a defost termination thermostat which is mounted on a coil supporting bracket in the gravity coil section directly beneath the top of the cabinet. This defrost termination overrides the time clock and turns the compressor back on line when the gravity coil is defrosted. This is the point at which the coil has reached sufficient temperature to incure complete defrost. If the defrost termination control should fail to operate, the time clock will automatically turn off defrost and again turn on the compressor after the 34 minute (or the time interval you selected) interval set on the time clock. If the time clock fails to turn the heaters off, a final back-up safety thermostat will shut off the heaters when gravity coil temperature reaches +80 oF.

Cabinet has a refrigeration system known as automatic defrost gravity coil with cold wall construction. This means the inner liner of the cabinet below the load level line is refrigerated by gravity flow of air from a fin and tube coil, as well as copper refrigerant lines attached to the back of the inner liner tank on all sides and the bottom.

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Master Bilt GT-80, GT-60, GT-50 manual Refrigeration System and Operation
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GT-80, GT-50, GT-60 specifications

Master Bilt has established itself as a leader in the refrigeration industry, particularly with its range of commercial refrigerators and freezers, including the popular GT series. The GT-60, GT-50, and GT-80 models exemplify the brand's commitment to quality, efficiency, and advanced technology.

The Master Bilt GT-60 is designed for maximum storage capacity with a generous interior space that allows for easy organization and access to stored items. Its exterior is crafted from durable stainless steel, ensuring longevity and resistance to corrosion. One of its standout features is the advanced digital thermostat, which provides precise temperature control and easy monitoring of internal conditions. The GT-60 is also equipped with a self-contained refrigeration system, which simplifies maintenance and enhances energy efficiency.

Similarly, the GT-50 model is engineered with the same focus on reliability and performance. With a slightly smaller footprint compared to the GT-60, it is ideal for establishments with limited space but still requires ample storage capacity. The GT-50 features energy-efficient LED lighting that not only illuminates the interior but also reduces overall energy consumption. This model also includes secure locking doors, ensuring that valuable inventory remains safe.

The GT-80 stands out for its impressive cooling capacity, making it exceptionally suitable for busy commercial kitchens and restaurants. It is designed to maintain optimal temperatures even under heavy load conditions. The model incorporates an innovative airflow design that promotes uniform cooling throughout the unit, preventing temperature fluctuations that can compromise food quality. Additionally, the GT-80 boasts easy-to-clean interiors, with removable shelving that makes cleaning a breeze.

All three models feature environmentally friendly refrigerants, aligning with global standards for energy efficiency and sustainability. Each unit is designed to operate quietly, reducing noise pollution in busy kitchen environments. The GT series combines robust construction with advanced technology, ensuring that each unit not only meets but exceeds the demands of the modern food service industry.

In summary, the Master Bilt GT-60, GT-50, and GT-80 models offer exceptional features that cater to the diverse needs of commercial users. With their focus on efficiency, durability, and advanced refrigeration technology, these machines have become indispensable assets for restaurants, cafes, and food service operations.
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