True GDM - User Manual

This document is an installation manual for True Manufacturing Co., Inc.'s GDM Freezer/Refrigerator models, providing comprehensive instructions for setup, operation, and maintenance.

Function Description:

The True GDM Freezer/Refrigerator is a commercial refrigeration unit designed to maintain optimal temperatures for food storage. It is built for durability and trouble-free operation, ensuring products are kept cool or frozen as required. The manual emphasizes proper installation by trained professionals to ensure the unit's longevity and to validate the warranty. These units are rated for open food storage and are designed for indoor use, not suitable for outdoor environments or areas where pressure washers or hoses might be used.

Important Technical Specifications:

The manual outlines various clearances required for different GDM models to ensure proper ventilation and operation. For instance, the GDM-05/05F requires 12" (304.8 mm) open space at the top, 1" (25.4 mm) on the sides, and 1" (25.4 mm) at the back. Other models, like the GDM-10/12/10-58, require 1" (25.4 mm) at the top, 0" on the sides, and 1" (25.4 mm) at the back. GDM Freezers generally require 12" (304.8 mm) open space at the top and 3" (76.2 mm) at the back. These units are tested to IEC EN 60335-2-89 Climate Class 5 (109°F/43°C, 40% relative humidity) for safety and EN 23953-2:2015 Climate Class 3 (77°F/25°C, 55% relative humidity) for performance. Ambient temperatures for proper operation should not be less than 60°F (15.5°C).

Electrical specifications highlight the use of NEMA plug configurations (5-15R, 14-20R, 5-20R, 6-15R) for 115V and 230V systems, with a strict warning against using adapter plugs or extension cords, which will void the warranty. The unit must be plugged into its own dedicated electrical circuit. The shelf weight capacity is 47lb/ft² (230kg/m²). Refrigerant types can include Hydrocarbon (R290), R404A, or R134A, with specific warnings regarding handling flammable refrigerants and the need for trained service personnel for repairs.

Usage Features:

The GDM Freezer/Refrigerator is designed for straightforward use. Upon initial setup, the unit should be run empty for 24 hours to verify proper operation before loading products. The compressor is ready to operate when plugged in. Temperature control and light switch locations vary by model; most have the light switch on the right side of the ceiling, next to the temperature control, or integrated into an electronic temperature control with a digital display. Mechanical or electronic temperature controls without digital displays are typically found inside the top right ceiling or back wall.

The manual details the general sequence of operation for both refrigerator and freezer cabinets, including how interior lights illuminate, electronic controls activate, and the compressor/evaporator fans start (potentially with a short delay). Defrost cycles are initiated by a timer or electronic control to prevent frost and ice buildup. Refrigerators with mechanical controls defrost during every compressor off-cycle, while freezers with mechanical controls defrost by time initiation. Some models (TFM, TDC, THDC, TMW) require manual defrost. The electronic control displays "def" during defrost.

Slide door operation includes instructions for removal and adjustment. The "hold-open" feature allows the door to remain in an open position, which can be engaged by latching the door in the open position from the back side of the door (notch in track).

Maintenance Features:

Routine maintenance is crucial for the efficient and successful operation of the unit. Key maintenance tasks include:

Condenser Coil Cleaning: This is a critical task that should be performed every 30 days or as needed. Tools required include a 1/4" nut driver, 3/8" nut driver, stiff bristle brush, tank of compressed air, vacuum cleaner, flashlight, and eye protection. The process involves disconnecting power, removing the front louvered grill, brushing accumulated dirt from the coil fins, and vacuuming the area. If the view through the coil is still blocked, the condensing unit may need to be carefully slid out for a more thorough cleaning with compressed air or CO2. The manual explicitly states that condenser coil cleaning is NOT covered by warranty.
Stainless Steel Care & Cleaning: The manual provides detailed instructions for cleaning stainless steel surfaces to prevent corrosion. It warns against using steel wool, abrasive, or chlorine-based products. Instead, it recommends using non-abrasive tools like soft cloths and plastic scouring pads, cleaning along polishing lines, and using alkaline, alkaline-chlorinated, or non-chloride cleaners. Prompt rinsing and drying are essential, especially after using chlorinated cleaners. The use of hydrochloric acid (muriatic acid) is strictly prohibited. Water treatment to soften hard water and remove corrosive elements is also suggested. Regular restoration and passivation of stainless steel are recommended to maintain its protective chromium oxide layer.
Component Replacement: Any servicing or replacement of components should be done with OEM (original equipment manufacturer) parts by a licensed service provider to minimize risks and ensure safety. Before any repairs or cleaning, the unit must be unplugged, as setting temperature controls to "0" or powering off an electronic control may not remove power from all components.
Cabinet Adjustments: The cabinet must be level and properly supported. Leveling legs or castors are installed and adjusted to ensure the cabinet is stable and level, which is critical for effective condensate removal and door operation. For models with a center leveling screw, castor, or leg, it must make full contact with the floor after leveling. Sealing the cabinet to the floor with NSF-approved sealants is recommended, especially for asphalt floors, to protect against chemical attack.

The manual also includes contact information for warranty and technical support in North America, Mexico, Latin America, UK, Ireland, Middle East, Africa, India, European Union, Commonwealth of Independent States, and Australia.