Follett fzr1, Инструкция по установке, эксплуатации и обслуживанию

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Temperature Control
The temperature control system is preset by the factory to maintain a product temperature of –28 C (–18 F). If
desired, the set-point temperature can be raised as high as –17 C (0 F) by following the instructions in
Controller
Operation for changing the temperature set point.
Defrosting
This unit is equipped with an electric defrost circuit designed to keep the evaporator “frost free”. Defrost cycles
are automatically initiated every six (6) hours. The cycle is terminated following a maximum twenty (20) minute
duration, or when the evaporator surface reaches a temperature of 5 C (41 F) as measured by defrost P2 probe.
During defrost there will be warmup in cabinet temperature, but the stored product will remain below –15 C (5 F)
with the setpoint at the factory default of –28 C (–18 F).
Controller Operation
The controller is pre-programmed with a –28 C (–18 F) set point. If this set point does not meet your specific
application needs, instructions for changing the set point are found below.
Controller Display
In normal operation, the controller displays simulation bottle temperatures in degrees celsius (C) or user-selected
degrees fahrenheit (F). Temperatures can be displayed to one decimal point.
The controller has system indicators above the temperature display to let you know when: the compressor is
energized (
COMP), the evaporator fan is energized (FAN) or the unit is in defrost (DEF).
To display temperature Set-point
Step Input Display
1 Press and release SET Current set-point temperature will display for approximately 5 seconds.
Display will return to current product temperature.
To change temperature Set-point
Step Input Display
1 Press and hold SET for 3 seconds Set-point will flash.
2 Press UP or DOWN arrows to desired
set-point
New temperature set-point will flash on the display.
3 Press and release
SET to accept
Product temperature will display.
The compressor cut-in temperature is determined by the setpoint (SET) plus an offset (doF). The compressor
cut-out temperature is determined by the cut-in minus the differential (DIF).
Default settings of offset (doF) and differential (DIF) are in the second level menu (L2):
§
Cut-in = (SET) + (doF) = –28 + 1.1 = –26.9 C
§
Cut-out = (cut-in) – (DIF) = –26.9 – 2.2 = –29.1 C
FZR1/FZR2 Compact Freezers 13