Kolpak A421 Manuel D'installation, De Fonctionnement Et D'entretien page 10

Do not block the supply and return air grills or the air space around the air grills. Keep plastic wrappings, paper, labels, etc.
from being airborne and lodging in the grills. Failure to keep the air grills clear will result in unsatisfactory operation of the
system.
• The Drop-In refrigeration systems are of the draw through design. The walk-in air is drawn into the supply air grill,
through the evaporator coil, and discharged out the return air grill into the walk-in. Any interruption or obstruction of
the supply or return air streams will result in unsatisfactory operation of the system.
• Coolers: When powered on, the evaporator fan(s) run continuously, even during defrost cycles, and the
condensing unit will cycle on/off to maintain the walk-in temperature.
•
• Freezers: When powered on, the evaporator fan(s) run continuously except when the system is in defrost and for a
short period after the defrost cycle is complete. The condensing unit will cycle on/off to maintain walk-in
temperature.
NOTE:
Walk-in temperatures will elevate above the set point during defrost cycles (approximately 30 – 45 minutes, 4 times
per day) but will return to the set point once the defrost cycle is complete.
Johnson Control A421 Electronic Temperature Control
•
The front panel of the A421 Series Electronic Temperature Control has an LCD and a three-button UI
LCD
• The A421 Series Control has a backlit LCD screen. You can adjust the LCD brightness. During normal operation, the LCD
displays the Main screen, which provides the following information:
• Temperature sensed at the A99 sensor
• Selected temperature units (°F or °C)
• Mode of operation (Flame = Heating mode, Snowflake = Cooling mode)
• Binary Input status (BIN) when a user-supplied binary input (switch) is connected and closed to enable the
temperature setback feature.
Section 3
Operation
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