Specialized refrigeration equipment for floristry is not just cold chamber, but a complex climate system that requires precise calibration of parameters. Setting up a flower refrigerator is fundamentally different from adjusting a household unit, since living plants continue to breathe, emit heat and ethylene even after cutting. Errors in setting the temperature or humidity can lead to rapid withering of the buds, the appearance of mold on the stems, or, conversely, to their drying out.
Owners of salons and greenhouses need to understand that each type of plant has its own preferences, but there are basic principles of operation floristic chambers. The correct configuration of the control system Microtech or Dixell allows you to extend the life of cut flowers several times, maintaining their presentation and the elasticity of the petals. Ignoring the requirements for air circulation often becomes fatal for delicate orchids or roses.
Before proceeding with manual adjustment of the controller, it is important to ensure that the seals are in good condition and the condenser is clean. The optimal temperature for most cut flowers is from +2°C to +5°C, however, this range may vary depending on the season and the type of product being loaded. Next, we will analyze in detail all the stages of the initial and seasonal setup of the equipment.
Principles of operation and basic parameters of the microclimate
The main task of the phyto-chamber is to slow down the metabolism of plants without putting them into a state shock. This is done using precise temperature and humidity control. Unlike food warehouses, air exchange is critical here, since flowers emit ethylene a gas that accelerates aging. If the ventilation system is not configured correctly, the concentration of ethylene will increase, and the bouquets will lose freshness in a matter of hours.
The second key parameter is the relative humidity of the air. Too dry air causes moisture to evaporate through the petals faster than the roots (or stems in water) can replenish it. However, excess moisture creates ideal conditions for the development of fungal diseases such as botrytis. Balance these indicators based on the hygrometer readings.
⚠️ Attention: Sudden temperature changes when loading warm products can cause condensation to form on the leaves, which provokes rotting. Try to pre-cool the flowers before placing them in the chamber.
Modern controllers allow you to set complex algorithms for the operation of the compressor and fans. For example, night mode may involve a slight decrease in temperature to simulate natural conditions. Understanding the physics of the processes of evaporation and condensation will help you avoid typical mistakes when operating refrigerated display cases for flowers.
Setting temperature and defrosting controller
The central control element is an electronic controller, most often brand Dixell, Carel or Evco. It is through its interface that Settings you set target values. Initial setup begins with setting the settings (set-point). For standard flower mode, the value is usually set within +4°C. Lower temperatures can damage tropical plants, and higher temperatures will not stop the development of bacteria.
Particular attention should be paid to defrosting (thawing) cycles. In flower chambers where humidity is high, the evaporator becomes overgrown with frost very quickly. However, frequent or prolonged defrosting leads to temperature fluctuations. It is recommended to set the defrost interval (dFi) to about 6 hours, and the duration (dFd) to no more than 20-30 minutes, if the defrost end sensor does not work earlier.
- 🌡️ Set-point: Target storage temperature (usually +2...+5°C).
- ❄️ dFi (Defrost Interval): Compressor operating time between defrosts (360-480 minutes).
- ⏱️ dFd (Defrost Duration): Maximum operating time of the heating element (15-30 minutes).
- 🌡️ dFs (Defrost Termination): End defrost temperature (usually +10...+12°C).
It is important to correctly set the hysteresis (differential) of turning on the compressor. Too narrow a range will result in frequent switching on and off, which will shorten the life of the equipment. A spread of 1.5-2 degrees from a given point is considered optimal. This ensures climate stability without unnecessary wear and tear on the mechanics.
☑️ Checking the controller settings
Adjusting the humidity and ventilation system
Maintaining humidity at 85-95% is the key to turgor (elasticity) of flowers. In professional cameras, ultrasonic humidifiers or evaporators with a large heat exchange area are often used for this purpose. Setting up the ventilation system directly affects this parameter. If the evaporator fan is running constantly, it will dry out the air by forcing it through a cold and dry radiator.
It is recommended to set the controller so that the evaporator fan stops at the same time as the compressor or runs intermittently. This reduces the speed of air movement over the heat exchanger and reduces the freezing of moisture from the air. However, a complete stop of circulation is also unacceptable, as this will lead to the formation of “warm pockets” and uneven cooling.
| Plant type | Temperature (°C) | Humidity (%) | Ventilation |
|---|---|---|---|
| Roses, Carnations | +1...+3 | 90-95 | Moderate |
| Orchids, Anthuriums | +10...+13 | 85-90 | Weak |
| Bulbs (Tulips) | +0...+2 | 85-90 | Active |
| Greens (for bouquets) | +2...+5 | 95-98 | Minimum |
To control humidity, use a hygrometer placed in the center of the chamber, away from doors and direct air flows. If the humidity drops, check for water in the humidifier tray or increase the frequency of defrost cycles, as water draining from the evaporator is also a source of humidification.
⚠️ Warning: Excessive ventilation with outside air in hot weather can dramatically reduce the humidity inside the chamber. Use air recirculation or pre-cooling of the supply air flows.
Peculiarities of storage of different groups of plants
Not all flowers react equally to cold. There are so-called “chilling injury sensitive” plants. These include many tropical species: phalaenopsis orchids, anthuriums, heliconias, alstroemerias. For them, setting up the refrigerator should be gentle. Temperatures below +10°C can cause blackening of the petals and vitreous tissue, which is irreversible.
On the other hand, temperate climate flowers (tulips, daffodils, most roses) require close to zero storage for maximum preservation. It is important here to prevent water from freezing in the plant tissues. Therefore, setting the temperature to +0.5...+1°C is a safe limit. At this temperature, metabolic processes practically stop.
For mixed storage, it is necessary to zone the space or use separate chambers. If this is not possible, focus on the most demanding group of plants in the current load. Often florists use special preservatives in water, which allow them to slightly expand the permissible temperature range and reduce sensitivity to bacteria.
Plant compatibility table
Some flowers emit substances that are harmful to others. For example, daffodils secrete mucus, which clogs the blood vessels of tulips, accelerating their wilting. Store them in separate containers or chambers.
It is also worth considering the stage of development of the bud. Flowers in the “tight bud” stage tolerate lower temperatures and long-term storage better. Blooming flowers require higher temperatures and ideal humidity, otherwise the petals will quickly begin to crumble or rot at the base.
Maintenance and monitoring of equipment operation
Even a perfectly tuned refrigerator requires regular maintenance. Dust on the condenser reduces the efficiency of heat transfer, causing the compressor to wear out and increasing the temperature inside the chamber. The condenser should be cleaned at least once a month, and in dusty areas - every two weeks.
Checking door seals is another critical point. Warm, moist air enters the chamber through a loosely closed door, which leads to increased snow formation on the evaporator and temperature fluctuations. If the seal is dirty, clean it with warm water and a mild detergent. If it has lost elasticity, replace it.
- 🧹 Monthly: Cleaning the condenser and drainage system.
- 🚪 Weekly: Checking the tightness of the doors and the condition of the seals.
- 📉 Daily: Visual monitoring of the thermometer and hygrometer readings.
- 🔊 When there is noise: Checking the tightness of the fan and compressor fasteners.
Listen to the operation of the equipment. The appearance of extraneous noise, gurgling or humming may indicate a fan malfunction, ice getting into the impeller or problems with the refrigerant. Timely detection of anomalies saves expensive repairs and loss of inventory.
Typical errors and troubleshooting
One of the most common mistakes is overloading the camera. Flowers should be stored loosely to allow air to circulate around each stem. If the chamber is filled to capacity, stagnation zones will form in the center, where the temperature will be significantly higher than the set one, which will lead to spoilage of the product.
Another mistake is storing flowers together with fruits or vegetables. The fruits emit large amounts of ethylene, which even in microscopic concentrations accelerates the aging of flowers, the falling of petals and the yellowing of leaves. The flower refrigerator should be intended only for flowers and greenery.
⚠️ Attention: Technical characteristics and controller interfaces may vary depending on the model and year of manufacture of the equipment. Always check the official device passport (manual) before changing the factory settings.
If the temperature in the chamber does not hold, check if the drainage is clogged. Water from defrosting should drain by gravity. If the drainage hole is frozen or clogged with debris, water accumulates in the pan, freezes and blocks the operation of the fan or raises the overall humidity to critical values.
What to do if the chamber does not freeze?
Check whether the compressor operation indicator is on. If yes, but there is no cold, there may be a freon leak or a compressor malfunction. If the indicator does not light, check the controller settings or the integrity of the temperature sensors.
Frequently asked questions (FAQ)
Can food be stored in a flower refrigerator?
It is strictly not recommended. Products can be a source of bacteria and mold that are harmful to flowers, and flowers, in turn, can absorb foreign odors. In addition, the humidity requirements for products and flowers are often opposite.
How often do you need to completely defrost the chamber?
Modern chambers with automatic defrosting do not require manual defrosting in normal mode. However, once every 3-6 months it is recommended to carry out a complete sanitary defrosting to wash and disinfect the internal surfaces.
Why does a gray coating (botrytis) appear on flowers?
This is a fungal disease that develops with a combination of high humidity, low temperature and insufficient air circulation. It is necessary to improve ventilation and reduce humidity, and remove affected flowers immediately.
What temperature is considered critical for most flowers?
For most cut flowers, temperatures below 0°C will lead to freezing of the cell sap and death of the plant. Temperatures above +8°C sharply accelerate the aging process and the proliferation of bacteria.