Manual 2100-670
Page
29 of 32
Bard Guard Anti-Theft System Option
The unit has the option to be shipped from the factory
with a low pressure switch, panel sensors and a
speaker. These devices are used with the Bard Guard
BG1000 anti-theft controller to provide an anti-theft
measure. These sensors and switch form a loop that
when connected to the BG1000 controller will cause
the system to go into alarm if any of the front panels or
coil assemblies are removed without being disarmed.
The speaker provides an audible alert that the system
is being tampered with. The Bard Guard anti-theft
control sensor connection is wired to terminals 7 and
8 on the wall unit. The speaker connection is wired to
terminals 5 and 6 on the wall unit. See the BG1000
Installation Instructions 2100-672 for directions on
connecting the wall units to the BG1000 controller.
Smoke Detector Option
The unit is equipped with an input that requires a dry
contact. This will disable unit operation and is intended
to be used with a smoke detector (not supplied). When
this input indicates a smoke event, the system will be
shut down. The alarm will automatically clear when the
alarm condition is no longer present.
Inverter Option
The inverter is only used in applications where a
generator is not present and the units must run during
a power loss. The inverter will detect when power is lost
to the wall unit and automatically turn on. The inverter
will convert 48 vdc to 230 vac. It will also energize
a power loss relay that will only allow the blower and
economizer to run while powering the controller. A relay
output from the inverter will also communicate to the
controller that a power loss event has occurred. This
data point will be communicated back to the LV1000
(powered by -48 vdc all the time). This variable
will then be available as a relay output for remote
communication applications or communicated through
the board Ethernet port for integration into building
management system. The units will continue to run
in economizer-only operation until power has been
restored or the battery power has been depleted.
The economizer may be disabled by the LV if the
system determines it needs to enter dehumidification
mode. More information about the dehumidification
sequence can be found on page 12 and in LV1000
Service Instructions 2100-673. In addition to dehum
mode, the economizer may be disabled for 30 minutes
(adjustable) if the dust sensor indicates the outdoor air
is not acceptable for cooling. After the time has expired
and on a call for cooling, the economizer will open
again to sample the air. The unit will either return to
normal operation or remain locked out for another 30
minutes.
Emergency Ventilation Mode
If the shelter temperature is above the high
temperature alarm 2 on the LV, the unit will be
commanded into emergency ventilation mode. In this
mode, the unit will open the economizer to 100%. The
compressor may run during this mode. This will stay
active until the LV returns the unit to normal operation.
This mode is only available when connected to the LV.
Model/Serial Number Configuration
The system will automatically configure some settings
based on the model number input into the unit. The
model and serial number are entered at the factory.
During a program update, the model and serial number
may be lost and need to be re-entered.
The unit will look at model number character number
10 to determine if the economizer should be disabled.
If the character is a E or e, the economizer operation
will be disabled.
The unit will look at model number characters 8 and 9
to determine how many heat stages are available. If the
characters are 0Z, 0z, MZ, Mz, mZ or mz, the unit will
be set to 0 stages of heat. If the characters are 05, m5
or M5, the unit will be set to 1 stage of heat.
Electric Heat Option
Electric Heat Components
Electric Heating Element
The unit is optionally equipped with a 5kw heat strip.
The heat strip is located next to the blower assembly
and uses resistive heat.
Thermal Overload
The heater assembly has a thermal overload wired in
series with the heating element. This device has a
cycling limit which opens at 130°F and resets at 80°F.
The limit is also equipped with a redundant thermal
fuse that will open at 150°F.
Electric Heat Operation
The heat strip will be activated on a call for heat.
This call can be generated by the LV or the wall unit
operating in stand alone mode.
