True TMC-49-HC - User Manual

This document outlines the installation, operation, and maintenance of a True Manufacturing milk cooler, designed for commercial refrigeration. The manual emphasizes proper setup and care to ensure long-lasting, trouble-free operation and to maintain warranty validity.

Function Description

The True Manufacturing milk cooler is a commercial refrigeration unit engineered to maintain an approximate internal temperature of 35°F (1.6°C), suitable for storing milk and other perishable products. Its primary function is to provide reliable cooling, ensuring product freshness and safety in commercial environments. The unit utilizes a compressor and evaporator fans to circulate refrigerated air, with temperature controls managing the cooling cycles. Some models feature a reversing condenser fan motor, which periodically reverses its rotation to blow dirt off the condensing coil, enhancing efficiency. The cooler is designed for continuous operation and is equipped with various safety features to prevent electrical hazards and ensure proper grounding.

Usage Features

The milk cooler is designed for straightforward operation, with several features aimed at user convenience and product preservation.

Temperature Control: The unit comes factory-set to maintain an approximate temperature of 35°F (1.6°C). Depending on the model and age, temperature controls can be mechanical or electronic. Mechanical controls are typically located inside or behind the cabinet, or behind front/rear access grills, and are adjusted using a dial with settings from #1 (warmest) to #9 (coldest), with #0 being the off position. Electronic controls, found in countertop or louvered panels, offer a digital display and more precise adjustments. The manual advises against excessive tampering with controls to avoid service difficulties.
Loading Guidelines: Proper air flow is crucial for efficient operation. Users are instructed to load products carefully, ensuring they do not press against the back wall or come within four inches of the evaporator housing. This allows refrigerated air to circulate effectively down the back wall, maintaining consistent temperatures throughout the cabinet.
Startup Procedure: After installation, the unit should be plugged in. It is recommended to allow the cooler to run empty for several hours (or even two to three days) to fully cool the cabinet and verify electrical wiring and installation before loading products. If the unit is disconnected or shut off, a five-minute waiting period is advised before restarting.
Door Locks (Optional): For models equipped with door locks, the keys are located in the warranty packets.
Electronic Control Interface (LAE Models): For units with LAE electronic controls, a digital display provides information on refrigeration/heating mode, fan operation, and defrost mode.
- Locking/Unlocking Controller: The controller can be locked to prevent accidental program changes. This involves pressing and holding the "Info" button, navigating to "Loc" using the "Down" button, and then using "Up" or "Down" to toggle between "no" (unlocked) and "yes" (locked).
- Turning Off Control: The electronic control can be turned off by pressing and holding the "Stand-by" button until "OFF" appears. It's important to note that this only deactivates electrical components; the cabinet must be unplugged for complete power shut-off during repairs.
- Light Control: Interior and sign lights can be controlled via the LAE controller by pressing the "Manual Activation" button, or by an interior rocker switch located on the inside top right of the ceiling in some models.
- Changing Set Point: The set point (target temperature) can be adjusted by pressing and holding the "Info" button, then using the "Up" or "Down" buttons to change the value.
- Manual Defrost: A manual defrost can be initiated to clear accumulated frost or ice. The method varies depending on whether the controller is preprogrammed for "Regular Time Defrost (TIM)" or "Real Time Clock (RTC)," involving specific button presses and holds.
- Changing Defrost Intervals: For controllers set to "TIM" defrost mode, the defrost interval (time between defrost cycles) can be adjusted. This involves accessing specific parameters through the "Info" and "Stand-by" buttons and then using "Up" or "Down" to change the interval time.
- Display Readout (Fahrenheit to Celsius): The display readout can be switched between Fahrenheit and Celsius by pressing and holding the "Info" and "Stand-by" buttons simultaneously, then navigating through parameters to change the "readout scale."
- Displaying Probe Temperatures: The controller can display temperatures from various probes (T1, T2, T3) within the cabinet by pressing and releasing the "Info" button.
Mechanical Temperature Control Adjustment (High Altitude): For high-altitude locations, mechanical temperature controls may require adjustment to obtain warmer operating temperatures. This involves using a jeweler's screwdriver to turn a calibration screw clockwise, with each 1/4 turn equating to approximately 2°F warmer.
Danfoss Temperature Control Adjustment (High Altitude): For Danfoss mechanical controls, high-altitude adjustments involve using an Allen wrench (5/64") and a Torx screw (T-7) to adjust "cut-in" and "cut-out" set points. Turning each adjustment screw 1/4 of a revolution clockwise will warm up both set points by about 2°F.

Maintenance Features

Regular maintenance is crucial for the longevity and efficient operation of the milk cooler, and to ensure warranty coverage.

Condenser Coil Cleaning: This is a critical maintenance task that should be performed every 30 days, or as needed. Dirty condensers can lead to compressor failure, product loss, and increased electrical costs, and these issues are not covered by warranty.
- Procedure: Disconnect power, remove the rear lower grill assembly (by removing four side screws), and if necessary, remove bolts connecting the frame rail cross bar to access the compressor. Clean accumulated dirt from the condensing coil with a stiff bristle brush, then vacuum the dirt from the coil and interior floor. Lift the cardboard cover above the fan to clean fan blades. After cleaning, reassemble the compressor assembly, replace the cardboard cover, and reinstall the louver assembly. Reconnect power and verify the condenser is running.
- Tools Required: Phillips screwdriver, stiff bristle brush, adjustable wrench, air tank or CO2 tank, and a vacuum cleaner.
- Safety Precaution: When using compressed air to clean the condenser, eye protection is recommended to avoid injury.
Stainless Steel Equipment Care and Cleaning: To prevent rust and maintain the appearance of stainless steel surfaces, specific cleaning guidelines must be followed.
- Avoid Abrasives: Do not use steel wool, abrasive cleaners, or chlorine-based products, as these can damage the passive layer of the stainless steel, leading to corrosion.
- Cleaning Tools: Use non-abrasive tools like soft cloths and plastic scouring pads.
- Polish Lines: When cleaning, scrub parallel to the visible polish lines or "grain" on the stainless steel.
- Cleaners: Use alkaline, alkaline chlorinated, or non-chloride containing cleaners. Avoid traditional cleaners loaded with chlorides, as they can cause pitting and rusting. Contact the cleaner supplier if unsure about chloride content.
- Water Treatment: Soften hard water if possible to reduce deposits. Filters can remove corrosive elements.
- Cleanliness: Clean food equipment frequently to prevent hard stain build-up.
- Rinsing: After using chlorinated cleaners, rinse and wipe dry immediately. Allow stainless steel equipment to air dry, as oxygen helps maintain the passivity film.
- Avoid Hydrochloric Acid: Muriatic acid should never be used on stainless steel.
- Recommended Cleaners: For routine cleaning, soap, ammonia, and detergent medallion are suitable. Products like Arcal 20 or Lac-O-Nu Ecoshine provide a barrier film. For stubborn stains, Cameo, Talc, or Zud First Impression can be used. Easy-off and De-Grease It are effective for grease and burnt-on foods. Commercial detergents work for grease and oil. Benefit, Super Sheen, or Sheila Shine are recommended for restoration/passivation.
- Plastic Parts: Warm water and soap are sufficient for cleaning plastic parts; stainless steel cleaners are not recommended.
General Maintenance (Interior Cleaning): To clean the interior of the cooler, move the unit close to a floor drain. Remove floor racks, wash the interior of the tank, and then remove the tank drain plug located at the rear of the unit (below the grill) to release waste. Reinsert the plug once all waste is gone.

The manual strongly recommends professional installation by a trained refrigeration mechanic and electrician to ensure proper setup and to avoid voiding the warranty. It also emphasizes that loss or spoilage of products due to improper installation or maintenance is not covered by warranty.

True TMC-49-HC Specifications

General

Temperature Range	33°F to 38°F
Number of Doors	2
Horsepower	1/2 HP
Color	Stainless Steel
Door Reversible	No
Freezer Compartment	No
Type	Refrigerator
Exterior Dimensions (W x D x H)	54 x 29.5 x 78 inches
Voltage	115V