Bard W42AC-A - Pressure Service Ports

Manual 2100-692H
Page 27 of 44
FIGURE 22
8201-169 Compressor Control Module
High Pressure Switch Compressor Contactor Output
Alarm Output
Common
Delay-on-Break Time
Adjustment Potentiometer
Brownout Ignore Time DIP Switches*
18-30 VAC Input
Y Input from Thermostat
and High Pressure Switch
Troubleshooting Light
Low Pressure Switch
* Turn on only one switch for that specic ignore time setting.
10 seconds is the maximum brownout ignore time. If all
switches are "off", the control is in "do not ignore".
If a brownout condition is detected by the 8201-169,
the troubleshooting light will ash blue. The light will
continue to ash until the cooling call is satised or
power is removed from the Y terminal. This condition
does not prevent operation, it only indicates that a
brownout condition was present at some point during
the cooling call. If a brownout condition is detected,
CC will be de-energized and will retry after the delay-
on-make timer is satised; this process will continue
until call is satised.
If user chooses the 'do not ignore' position (all three
DIP switches "off") when the site has inadequate utility
or generator power, this could lead to the compressor
never starting. The control will
see the brownout
immediately and not start.
A common scenario and one that has been seen in the
eld is when a unit or units switches from utility power
to generator power. With slower transfer switches, the
time delay between the utility power and generator
power didn’t cause a problem. The units lost power,
shut off and came back on line normally. With the
introduction of almost instantaneous transfer switches,
the millisecond long power glitch can be enough that
the compressor will start to run backwards. In this
scenario, the CCM will catch this and restart the units
normally.
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 31 and 32. It is imperative to match
the correct pressure table to the unit by model number.
This unit employs high-ow 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 rst 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.