High Pressure Switch Operation; Vent Connection Plug; Pressure Service Ports - Bard W42HC-A Installation Instructions Manual

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 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 control panel 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 on
the side of the control panel behind the front vent door
(behind the filter access door). 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 33 and 34. 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.
Manual 2100-711F
Page 27 of 45