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8
1/22 Rev. F 171375
Defrost Cycle Termination
The electronic controller will run the coil heater until the coil is above 32°F. At this point it will work very different
than a traditional defrost cycle. The heaters will pulse on and off allowing the heat to radiate through the coil until
both coil sensing probes reach 50°F or 30 minutes whichever happens first. The fan(s) in the evaporator housing
will not start, however, until the fan delay cycle has expired. See the "Fan Delay" below.
Fan Delay
When a defrost cycle is terminated the evaporator fan(s) will not start until the evaporator coil temperature is
reduced to about +30°F. Once this temperature is reached, the fan delay cycle will turn the fans back on continuing
the refrigeration cycle.
The fan delay feature is an important part of defrosting. If the fan(s) was permitted to start immediately following
a defrost period, the heat that accumulated in the evaporator housing would be circulated throughout the walk-in,
raising the temperature considerably. In addition, any droplets of moisture that remained clinging to the fins of the
evaporator coil would be blown into the storage space. The fan delay feature provides for a short refrigeration cycle
WITHOUT the evaporator fan(s) to prevent these conditions.
Note: During the initial startup of a Capsule Pak Refrigeration System on warm walk-in, the evaporator fan(s) will
not start until the evaporator coil reaches +30°F. Further, the evaporator fans may cycle "on" and "off" several times
until the evaporator coil reaches and maintains +30°F.
Drain Tube Heater
Low temperature ceiling mounted Capsule Pak refrigeration systems employ a low wattage, electric heater
wire. This heater is spirally wound around the condensate drain tube that extends from the drain pan below the
evaporator through the Capsule Pak evaporator section housing wall. This heater is energized continually to allow
the free flow of the condensate water to the outside of the evaporator section.
Medium temperatures mounted Capsule Pak employ the same condensate drain tube that extends from the drain
pan below the evaporator through the Capsule Pak evaporator section housing wall but has no heater wire.
Drainage of Condensate Water
Indoor Models
On indoor self-contained Capsule Pak systems, the condensate drain tube is factory plumbed to discharge
the condensate water into an evaporative drain pan located under the compressor in the condensing unit. The
compressor discharge line is routed inside this pan to heat the condensate water to aid evaporation.
In locations where high moisture content exists, it is possible that the evaporative drain pan may overflow. In this
case the drain line must be plumbed to an optional electric condensate pan evaporator (part number 133141 or
132962).
Outdoor Models
On outdoor self-contained Capsule Pak systems, the condensate drain line must be plumbed by the installer. The
installer will need to provide a drain line connected to the drain tube exiting the evaporator section, route it thru
the provided knock-out holes on either side of the Capsule Pak system, wrap the line with suitable heater wire and
insulation if subject to below freezing temperatures and install a P-trap at the termination. The line can flow to an
optional condensate evaporator pan or to a drain.
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