Manual 2100-742B
Page
30 of 57
Low Pressure Switch Bypass Operation
The control has a selectable (SW1) low pressure switch
bypass set up to ignore the low pressure switch input
during the first (30, 60, 120 or 180 seconds) of “Y”
operation.
After this period expires, the control will then monitor
the low pressure switch input normally to make sure
that the switch is closed during “Y” operation.
High Pressure Switch Operation
The control has a built-in lockout system that allows
the unit to have the high pressure switch trip up to two
times in 1 hour during same compressor call and only
encounter a “soft” lockout. A “soft” lockout shuts the
compressor off and waits for the pressure switch to
reset, which at that point then allows the compressor
to be restarted as long as the 5-minute short cycle
timer has run out. If the high pressure switch trips a
third time within 1 hour, the unit is in “hard” lockout
indicating something is certainly wrong and it will not
restart itself.
Vent Connection Plug
All units are equipped with a vent connection plug in
the side of the low voltage box inside the control panel
on the left side for the different ventilation packages to
plug in to. If the compressor will not start and there is
no "Y1" at the compressor control module, first check
to make sure that either the optional vent is plugged
into the vent connection plug or the supplied jumper
plug is in place.
The unit will not operate without
anything plugged in.
This plug is located in the side of
the low voltage box inside the control panel on the left
side behind the inner control panel cover. If the unit is
supplied with a factory-installed vent package, it will
be plugged in but the jumper plug will also be tethered
next to the connection for troubleshooting purposes, if
necessary.
Pressure Service Ports
High and low pressure service ports are installed on
all units so that the system operating pressures can be
observed. Pressure tables covering all models can be
found on pages 39 and 40. It is imperative to match
the correct pressure table to the unit by model number.
This unit employs high-flow Coremax valves instead of
the typical Shrader type valves.
WARNING! Do NOT use a Schrader valve core removal
tool with these valves. Use of such a tool could result
in eye injuries or refrigerant burns!
To change a Coremax valve without first removing the
refrigerant, a special tool is required which can be
obtained at www.fastestinc.com/en/SCCA07H. See the
replacement parts manual for replacement core part
numbers.
