Figure 17 8201-169 Compressor Control Module - Bard W24G4 Installation Instructions Manual

Brownout Protection with Adjustment
Brownout protection may be necessary if the utility
power or generator power has inadequate power to
prevent the voltage from dropping when the compressor
starts. This is rare but can happen if the generator
is undersized at the site or if the site is in a remote
location far from the main power grid. Under normal
circumstances, allowing the brownout to be ignored for
a time period should not be needed. The 8201-169 is
shipped in "0" do not ignore position, with all the DIP
switches off (see Figure 17).
If ignoring the brownout is needed because of the
above conditions, three preset timers can be set by DIP
switches in order to delay signaling a power brownout
for a specific length of time after compressor contactor
is energized. This allows the compressor a time period
to start even if the voltage has dropped and allows the
voltage to recover. This delay only happens when the
CC terminal energizes. The delay can be set to 1 second
(A DIP switch), 5 seconds (B DIP switch) or 10 seconds
(C DIP switch); time is not cumulative—only the longest
setting will apply. If the voltage recovers during the
brownout delay period, the compressor will start.
High Pressure Switch
18-30 VAC Input
Y Input from Thermostat
and High Pressure Switch
Troubleshooting Light
Manual 2100-721B
Page 36 of 54
FIGURE 17
8201-169 COMPRESSOR CONTROL MODULE
Jumper
Brownout Ignore Time DIP Switches*
* Turn on only one switch for that specific ignore time setting.
10 seconds is the maximum brownout ignore time.
If a brownout condition is detected by the 8201-169,
the troubleshooting light will flash blue. The light will
continue to flash until the cooling call is satisfied 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 satisfied; this process will continue
until call is satisfied.
If user chooses the "0" do not ignore position 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
field 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.
Compressor Contactor Output
Alarm Output
Common
Delay-on-Break Time
Adjustment Potentiometer