ARP Control v5.x Troubleshooting Guide 0 © 2013-2020 ARPC L.L.C. All rights reserved.
4 04/20/202
2.8 OPn Process Value
The OPn value is a count of how many times the ARP
boiler sensor has had a wiring or sensor open condition.
Please see section 3.4 OPn for further information.
If there is an intermittent problem due to vibration or a
bad crimp connection, OPn will record the total number of
times the circuit opens and closes. Push the SetUp
button to zero the OPn value. Any changes must be
stored, see 2.22 Store Setting.
2.9 SHt Process Value
The SHt value is a count of how many times the ARP
boiler sensor has had a short circuit. When the ARP
Control is in the ARP mode of operation, and either the
wiring or sensor is measured as a short circuit, SHt will
flash on the screen. SHt will record the total number of
times the boiler sensor has an intermittent short circuit
and then returns to normal operation. A short in the
sensor circuit is usually do to either the two sensor wires
touching or a sensor wire shorted to chassis ground.
See 3.5 SHt and RTD TROUBLESHOOTING for further
information.
2.10 SSH Process Value
On/Off
Display
SetUp
The SSH value measures the boiler steady-state
maximum temperature. This value is only valid if the
control has been set to the PID control mode, see Set-
Point Function Setting section below.
If the control is tripping in the PID control mode, this
variable is very valuable for troubleshooting when
combined with the above AbS value. If the AbS value is
greater than the AtS value, the start up is tripping the
fridge. If the SSH value is greater than AtO value, the
control is tripping when in steady-state operation.
2.11 FAn Setting
FAn is the temperature setting at which the ARP will turn
On/Off the fan. There are six fan temperature settings to
select from.
For a non-fan type ARP Control, the fan setting is a fixed
number 0 and cannot be changed.
By momentarily pressing the SetUp button the fan control
temperature can be set to a desired value. Any changes
must be stored, see 2.22 Store Setting.
4 is the default fan setting value.
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