Pressure Service Ports; Sequence Of Operation; Cooling; No Economizer - Bard WA Series User Manual

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 with all the DIP switches in the 'off' or 'do not
ignore' position (see Figure 22).
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.
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 '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.

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 can be found on page 32.
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!
Manual 2100-720C
Page 26 of 42
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.

Sequence of Operation

Cooling

No Economizer

Stage 1: (Y1) cooling call activates Step 1 (partial
capacity, 66%) of compressor capacity.
Stage 2: (Y2) cooling call activates Step 2 (full
capacity, 100%) of compressor capacity. (Jumper
installed)
Stage 2 Balanced Climate: 3 stage thermostat required.
Y2-Y3 jumper must be removed. (Y1, Y2) cooling call
activates Step 2 (full capacity, 100%) of compressor
capacity and Balanced Climate mode.

With Economizer

Stage 1 (Y1) cooling call goes to economizer controls
for decision:
• If enthalpy control decides outdoor conditions
are suitable for free cooling, the economizer will
operate.
If Stage 2 cooling call is issued during

economizer operation, the economizer will
close and the compressor will go straight to
Step 2 full capacity operation.
• If enthalpy control decides outdoor conditions
are not suitable for free cooling, the economizer
will not operate (or close) and Step 1 of the
compressor will operate.
If Stage 2 cooling call is issued, the

compressor will shift to Step 2 full cooling
capacity operation.
(See NOTE under CONDENSER FAN OPERATION
on page 24 concerning models equipped with low
ambient control.)
The G (indoor motor) circuit is automatically completed
by the thermostat on any call for cooling operation or
can be energized by manual fan switch on subbase for
constant air circulation. On a call for heating, circuit
R-W1 makes at the thermostat pulling in heat contactor
for the strip heat and blower operation. On a call for
second stage heat, R-W2 makes bringing on second
heat contactor, if so equipped.
Balanced Climate Mode
TM
Balanced Climate™ is a great comfort feature that can
easily be applied under any normal circumstances. If
the Bard air conditioning system is being set up in a
typical environment where 72°F is the lowest cooling
setpoint, remove the Y2/Y3 jumper and install a
3-stage cooling thermostat (no economizer with JADE