Zero Zone Highlight MERCHANDISER 1RHCC30, Руководство по установке и эксплуатации

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Installation & Operation • 17
INSTALLATION & OpERATION
DEFROST HEATER ELEMENT
On 30" door cases, one half of the U-shape heater is located on the front of the coil and the other half is located on the rear of the coil. . The
electric wire leads are connected in the junction box behind the front kick rail.
HEATER ELEMENT REMOVAL
Front and Rear Heater Location (RHZC30 and RHZC30T)
The U-shape defrost heater has one leg located on the front of the coil and one leg located on the rear of the coil. The front heater is located
approximately 1" off the floor and the rear heater is approximately 2" off the floor. The heater is secured to the coil by a number of stainless steel
heater retaining clips. The heater is fastened to the floor on the right-hand side of the coil. Remove fasteners holding the heater to the floor.
The U-shape defrost heater can be removed by first pulling the front leg of the retaining clip away from the coil and sliding the heater out from
under the clip. The rear leg of the heater can then be removed by raising the retaining clips 2 inches at a time, working from right to left on the
coil. Repeat this process until the retaining clips are free of the coil. The heater will slide up with the retaining clip.
Heaters are installed in the reverse order of how they were removed.
Defrosting - Medium Temp
GENERAL
Periodic defrosting to keep the coil free of frost is accomplished automatically by a time clock. Medium temperature cases generally operate
at temperatures that allow for off-cycle defrost. Medium temperature cases used for fresh meat products are often set to run slightly colder
than ordinary refrigerated cases. For evap temps down to 25°F, ordinary off-cycle defrost cycles at 2 per day usually defrosts adequately and
still keeps meat fresher longer than open cases. For operators that want to soft freeze their meat (i.e., evaporator temps colder than 25°F), an
optional electric or hot-gas defrost may become necessary to ensure a complete defrost depending on the application.
DEFROST SETTINGS AND CONTROLS
Off-Cycle Defrost
Frequency: Two off-cycle defrosts per day are recommended.
Duration: Generally defrost is terminated on time with the recommended setting of 30 minutes. If temperature termination is selected, the
termination temperature is set for 45°F for discharge air and coil temperature. Stocking or shopping activities during temperature-terminated
defrost may result in premature defrost termination.
ELECTRIC AND HOT GAS DEFROST
Follow the setting recommendations found in the section "Defrosting - Low Temp" on page 14 .
DEFROST OPERATION
Off-Cycle
For off-cycle defrost, refrigeration to the unit is stopped either by stopping the compressor or closing the liquid line solenoid valve and allowing
the compressor to pump down. During an off-cycle defrost, the fans, lights, and anti-sweat heaters remain on.