Arp Reset Procedure; Introduction To Fridge Repair; Refrigerant; Boiler Operation - ARP Fridge Defend Troubleshooting Manual

ARP Control v5.x Troubleshooting Guide

3.20 ARP Reset Procedure

The ARP can be turned off, and the
refrigerator will resume operation as it did
from the factory. We do not recommend
turning off the ARP if it has detected an over
heat situation, please let the ARP do its job
and allow it to restart the fridge. By turning
the ARP off and then back on, the control will
be reset and resume monitoring boiler
temperature.
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INTRODUCTION to FRIDGE REPAIR

4.1 Refrigerant

The SPAR RV refrigerator, when constructed
properly is extremely reliable due to the fact
that the process is quite simple. The
refrigerant (working fluids) consists of water,
ammonia, and sodium chromate.

4.2 Boiler Operation

The heart of your RV refrigerator is at the
boiler. The boiler can also be called the
generator because the boiler 'generates' the
ammonia refrigerant. The boiler performs a
distillation process, the ARP monitors this
process and detects when ammonia is not
being generated. Think of the ARP as a heart
monitor keeping your fridge alive.

4.3 Boiler Pump

The heat source that drives your SPAR
simply separates the water and ammonia
(distillation). Ammonia boils at a lower
temperature than water, thus the heat source
boils the ammonia. Just like a coffee
percolator, the ammonia gas transports the
liquid water up a pump tube, at the top of the
pump tube the ammonia gas raises and the
water descends by the effect of gravity.

4.4 ARP Control and the Boiler

The ARP control is effective because of the
simple physics. If there is no ammonia in the
boiler assembly of your SPAR, the boiler
pump will not work. The result, the normal
temperatures required to drive the SPAR
system will rise. It takes heat energy to
04/20/202 0 © 2013-2020 ARPC L.L.C. All rights reserved.
the ARP is turned off, the refrigerator will
resume operation if the fridge main power
button is not turned off before the reset
procedure. If your fridge has overheated,
there is a problem that should be addressed
by qualified persons.
change the ammonia from liquid to gas,
when this heat energy is not changing the
ammonia from liquid to gas; the heat energy
starts to destroy the SPAR. Restated, without
ammonia in the boiler, the heat energy will
cause the boiler temperature to rise until the
water in the SPAR starts to boil, this
damages your refrigerator. The ARP control
prevents the water from boiling in the SPAR
when installed and setup correctly.

4.5 Burping a SPAR

Folks that have been around RV and
stationary refrigerators such as a Servel
have heard of 'burping' the refrigerator.
Burping is necessitated by the fact that the
ammonia has not completed the SPAR
process and returned to the boiler. Burping
consists of turning the refrigerator over onto
its top. The burping procedure simply will
remix the ammonia and water in your SPAR.
As long as the system has not been
damaged by overheating and blockage of the
system, the refrigerator will resume operation
once the ammonia is returned to the boiler.
In most cases, burping is not necessary
when the ARP controls the boiler
temperature.
4.6 Abnormalities and Operator
Discretion
The ARP will turn off the heat source driving
your SPAR process before burping is
necessary. But it must be taken into account
that the ARP has sensed a rise in
temperature due to an abnormality in your
DANGER Please remember that when
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