Manual 2100-614K
Page
7 of 61
IMPORTANT NOTE:
Older Bard R-22 models employ an
electronic blower control that has a 60-second blower
off-delay. Current production R-410A models do not
use a blower off-delay device and the remainder of this
(paragraph) does not apply. In order to have immediate
shutdown of the blower motor, in addition to disabling
the run function of the air conditioners will require a
simple wiring modification at the blower control located in
the electrical control panel of the air conditioners being
controlled by the lead/lag controller. To eliminate the
60-second blower off-delay, disconnect and isolate the
wire that is factory-connected to the “R” terminal on the
electronic blower control, and then connect a jumper from
the “G” terminal on the blower control to the “R” terminal
on the blower control. The electronic blower control will
now function as an on-off relay with no off-delay, and the
blower motor will stop running immediately when the F1-
F2 fire suppression circuit is activated (opened).
STAGING DELAY PERIODS
The following delays are built in for both cooling and
heating:
Stage 1
– 0 seconds for blower (if not already on as
continuous)
10 seconds for cooling or heating output
Stage 2
– 10 seconds after Stage 1 for blower
10 additional seconds for cooling or heating
output
Stage 3
– 10 seconds after Stage 2
Stage 4
– 10 seconds after Stage 3
NOTE:
For cooling Stages 1 and 2, the stage LED will
blink for 10 seconds while the cooling output is delayed
after that stage is called for. There is also a delay after
the stage is satisfied, and after the LED stops blinking,
the stage will turn off. There is a minimum 10-second
delay between stages 2 & 3, and 3 & 4, but no delayed
output when stage is turned on or off, and LED for those
stages will not blink.
BLOWER OPERATION
The controller can be configured to have main HVAC
blowers cycle on and off on demand; have all blowers
run continuously; or have the lead unit blower run
continuously with the lag unit blower cycling on demand.
Default setting is the blower(s) start and stop on demand.
There is also an option to have all blowers cycle on if one
remote sensor is connected, and a temperature difference
of more than 5F between any two sensors is observed.
This helps to redistribute the heat load within the
structure and should reduce compressor operating time.
When any of the stages are satisfied, the stage LED will
blink for ten (10) seconds before the stage is actually
turned off.
ADVANCE (SWAP) LEAD/LAG UNIT
FEATURE
Pressing the Advance button for one (1) second will cause
the lead and lag units to change positions. This may be
useful during service and maintenance procedures. This
function not available when LLCO is set to zero.
ACCELERATE TIMER FEATURE
Pressing the UP arrow button for five (5) seconds
will activate an accelerate (speed-up) mode, causing
the normal changeover time increments of days to
be reduced to seconds. Example: 7 days becomes
7 seconds. When “ACC” displays, release button.
Whichever LED is on, indicating lead unit will blink over
for each second until the controller switches. This is a
check for the timer functionality.
