Norlake CAPSULE PAK Manual De Instalación página 18

N -L , I . C P ™ O
OR AKE NC APSULE AK PERATION
Fan Delay
When a defrost cycle is terminated through the action of the defrost termination thermostat as described in the
section "Defrost Cycle Termination", the electric defrost heaters are de-energized, the compressor starts, and
evaporation resumes in the coil. The evaporator fan(s), however, will not start until the evaporator coil temperature
is reduced to about +20°F. Once this temperature is reached, the fan delay switch action of the defrost termination
thermostat energizes the evaporator fan(s) and they begin operating.
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 Kold Locker™ Walk-in, the
evaporator fan(s) will not start until the evaporator coil reaches and maintains +20°F. Further, the evaporator fans
may cycle "on" and "off" several times until the evaporator coil reaches and maintains +20°F.
Refrigeration Controller
All Capsule Pak™ Refrigeration Systems up to and including 100 series, designed for indoor installations, are
equipped with conventional temperature thermostats that sense the "cut-in" and "cut-out" temperatures of the
return air to the evaporator coil. These thermostats are adjustable and require a turn of the dial to change the
interior storage temperature. Note: The control can be reached through the interior louver for adjustment,
with a 6" long shaft flat blade screwdriver. Make adjustments in small increments until the desired
temperature is reached.
All low temperature 150 series refrigeration systems, for indoor and
outdoor installation, employ a "pump-down cycle" which permits the
compressor to pump most of the refrigerant from the evaporator into
its receiver after each "on" cycle. In this application, the refrigeration
controller regulates the operation of a solenoid valve in the liquid
line. A low-pressure control is installed in the low side of the system
that shuts down the compressor due to low pressure, which results
when the solenoid valve closes the liquid line. The temperature
thermostat is adjustable and requires a turn of the dial to change the
interior storage temperature.
© 2008 Nor-Lake 4/08 PN 121430
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