Norlake CAPSULE PAK Manual De Instalación página 17

N -L , I . C P ™ O
OR AKE NC APSULE AK PERATION
LOW TEMPERATURE (FREEZER) SYSTEMS
The low temperature, automatic electric defrost Capsule Pak™ Refrigeration System is the most dependable
readily understood equipment available. It employs a basic refrigeration system with electric elements to
provide heat for defrosting.
Important: It is the installing contractor's responsibility to check the operation upon start-up and make necessary
temperature control or thermal expansion valve adjustments as required for proper operation.
Note: Capsule Pak™ Refrigeration Systems that are designed for outdoor installation will be fitted with electric
crankcase heaters, electrically heated condensate drain tubes, automatic head pressure control valve, and the
"pump-down cycle".
Time clock adjustments:
Setting the correct time of day: Simply rotate the minute hand clockwise until the correct time of day on the outer
dial is aligned with the triangle marker on the inner dial. In referring to the illustration, the correct time of day shown
is 8:00 a.m.
Number of defrosts per day: The time switch is factory set to provide four
defrosts per day. If more defrosts are required, move additional white tabs at
the desired time. No more than two consecutive tabs should be set at
any one time. Each white tab constitutes 15 minutes of defrost time. If the
four defrost periods provided are more than necessary, push white tabs back
toward the center of the dial.
Fail-Safe feature: The fail-safe of the timer is factory set at 30 minutes. The
function of this device is to terminate the defrost cycle and revert back to the
cooling cycle if a system malfunction occurs during defrost. No adjustment of
this device should ever be necessary. Lengthening the fail-safe time will not
lengthen the defrost cycle.
Note: The defrost times are factory set at 10:00 a.m., 4:00 p.m., 10:00 p.m.,
and 4:00 a.m. This setting will provide adequate defrosting for a normal
installation.
Defrost Cycle (Freezer System Only)
Under low temperature conditions, the air being forced through the evaporator coil is well below freezing at all times,
even during each compressor "off" cycle. Therefore, a source of heat must be supplied to melt the accumulated
frost. To achieve a complete defrost, electric heater elements are attached to the evaporator coil and to the drain
pan. An electric time switch initiates a predetermined number of regular defrost periods per day. When a defrost
period occurs, the time switch stops the evaporator fan(s) and the condensing unit, and energizes the electric
heaters in the evaporator coil and in the drain pan beneath it.
Note: For 220V 50Hz models, in which the model number ends with "ACE" or "CE", a programmable control is
used in place of the time switch. This unit is used to control the temperature and the defrost settings. Please see
the separate instructions that are included on the operation of this control.
Defrost Cycle Termination
As the defrost cycle progresses and the frost accumulation melts from the fins of the evaporator coil, the temperature
of the finned surfaces of the evaporator coil will rise proportionately with the removal of the frost. When this
temperature reaches about 50°F, a point where the evaporator coil should be completely free of frost, a defrost
termination thermostat attached to the evaporator coil will energize a solenoid coil in the defrost time switch which
will revert the system to the cooling cycle. The fan(s) in the evaporator housing will not start, however, until the fan
delay cycle has expired. See the "Fan Delay" below.
© 2008 Nor-Lake 4/08 PN 121430
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