Reveal ZERO ZONE, Installation & Operation Manual, Page: 21 / 25

Refrigeration • 19
REfRIgERATION
After all of the refrigeration piping and system components have been assembled, the entire system must be pressurized and checked for leaks.
When the system is leak free, evacuate with a deep vacuum pump. Triple evacuation should be done to 500 microns or less, and nitrogen
sweep is recommended. After the system has been thoroughly evacuated of all moisture and non-condensable gas, charge the system with the
specified refrigerant.
Cases will be equipped with a liquid-line filter drier by default.
Glycol cases typically have a balance valve located in the outlet line inside of the case. If a stop solenoid is provided, it will also be located in
the outlet line. Schrader valves are provided inside the case on the right-hand side of the coil for venting and draining the system.
Operation Set points
Refer to the case spec sheet for btu/h requirements and electrical requirements. Operate the case at the proper settings to maintain product
temperature of 41°F or below, per food safety regulations ( See Figure 38 ). Note: Set points based on flat shelves. Alternate shelving—
such as angled or tiered shelving, peg hooks, or produce inserts—may require lower operating temperatures.
Off-Cycle Defrost
See Figure 39 for off-cycle defrost settings. During off-cycle defrost, refrigerant is stopped either by stopping the compressor or by closing the
liquid line solenoid valve and allowing the compressor to pump down. The fans and lights remain on during off-cycle defrost.
If temperature termination is selected, set the termination temperature at 45°F for discharge air and coil temperature. Note: Stocking or
shopping during off-cycle defrost may cause premature defrost termination.
FIGURE 39: Defrost Settings
SETTING MEAT DAIRY/DELI/PRODUCE BEVERAGE
Defrost Type Off-Cycle Off-Cycle Off-Cycle
Frequency 4 per Day 4 per Day 4 per Day
Duration 36 Minutes 30 Minutes 30 Minutes
FIGURE 38: Case Temperature Internal Control Options (R-404A)
SETTING MEAT DAIRY/DELI/PRODUCE BEVERAGE
Evaporator Temperature 22°F 26°F 28°F
Condensing Unit Cut-In 62 psig 67 psig 71 psig
Condensing Unit Cut-Out 54 psig 59 psig 62 psig
Return Air Temperature Cut-In 44°F 48°F 50°F
Return Air Temperature Cut-Out 40°F 44°F 46°F
Discharge Air Temperature Cut-In 31°F 35°F 37°F
Discharge Air Temperature Cut-Out 27°F 31°F 33°F
Superheat Setting 6-8°F 6-8°F 6-8°F
Note: For high-glide refrigerants, use dew point for unit sizing. Adjust evaporator pressure as needed to maintain
discharge air temperatures. To receive the full benefit of high-glide refrigerant properties, the superheat may need to
be lowered to 4-6°F. Contact Zero Zone with questions.