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11
Section 3
Operation
• 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.
Thermostat
•
The body of the thermostat is mounted inside the condenser compartment on both Top Mount and Side Mount
models.
•
The sensing bulb is placed in the return air stream inside the evaporator compartment.
•
The thermostat on Top Mount models can be accessed by removing the louvered front panel.
•
The thermostat on Side Mount models can be accessed by removing the left side panel on the condensing unit
assembly.
Air Defrost Thermostat Electric Defrost Thermostat
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.
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