Adjustment Variables; C Or F; C-H, C-L, Or Pid Set-Point Methods; Fan Temperature Diagnostic - ARP Fridge Defend Troubleshooting Manual

ARP Control v5.x Troubleshooting Guide
refrigerator boiler temperature. If Auto
Tune is preformed at temperatures lower
than 16°C (~60°F), it is possible that SP
will have to be set higher than the default
value of 5 to compensate for a raise in
ambient temperature.
8.3 OS
The OS value is the temperature overshoot
value. The default setting of 5 is adequate for
most Norcold and Dometic refrigerators; a
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ADJUSTMENT VARIABLES

9.1 C or F

This function simply toggles between
Celsius and Fahrenheit. Default is Celsius.
This setting only changes the LED display
by toggling the units of temperature
measurement. The ARP does not change
its operation, just the manner in which it
calculates temperature on the display.
Please see 2.15 for adjustment.
9.2 C-H, C-L, or PID Set-Point
Methods
This function toggles between set-point
control methods. Also see
C-H is control-high method. This is the
default setting and one should only need to
use the other control methods if one wants
to fine tune the ARP for C-L, or your
particular fridge requires the PID Set-Point
function.
C-L is the control-low method. C-L allows
the operator of the ARP Control to fine tune
their control for higher sensitivity.
PID is the proportional-integrated-derivative
method. A PID control is necessary on
Amish (Dutch Aire) and newer Norcold
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04/20/202 0 © 2013-2020 ARPC L.L.C. All rights reserved.
2.16 for setting.
higher value is needed for some older
Dometic refrigerators and Dutch Aire cooling
units.
Purpose:
Because the ARP turns off the refrigerator
heat source when the ammonia is not
returning to the boiler, when the heat source
is turned back on, a higher temperature is
needed to re-start the refrigeration process.
side-by-side fridges and older Dometic
side-by-side. The PID control method
precisely adjusts the Set-Point for the
startup peak and steady-state on these
fridges. Purpose: The ARP is designed to
work on any absorption refrigeration system.
Therefore, the operator has the ability to
choose between the default (C-H) and the
Operator Adjustable Control Method (C-L).
C-L will take on the default Auto Tune
values and increase the sensitivity of the
ARP. Whereas, the PID setting is required
on some newer style cooling units.
Please see 2.16 for adjustment method.

9.3 Fan Temperature Diagnostic

This function controls the temperature at
which the fan will be turned on/off.
See section 2.11 and the User Guide for
more fan control details. The preferred
location for the fan thermistor is on the
absorber coils. Combining the fan
temperature with the boiler temperature
reading will help diagnose problems with
the cooling unit. We will post more on our
website www.ARPrv.com
troubleshooting methods using these two
instrumentation inputs.
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