Product Overview

BAC-1xx36/1xxx36 Series (3 Relays and 6 Analog Outputs) Section 62 Application Guide S
band, the second stage of heating will be deenergized. Upon further rise
in temperature above the active heating setpoint, the rst stage of heat-
ing will be deenergized.
Staged Cooling
If the economizer option is set to modulating economizer and the econo-
mizer mode is enabled, the stage(s) of cooling will be held o until the
outside air damper is 100% open. When the outside air damper is fully
open, normal staging of cooling is allowed. If the economizer option is
set to “Econ Dis/En” and the economizer mode is enabled, cooling is al-
lowed to stage normally.
If at any time there is a fan failure alarm or a low limit alarm, all stages
of heating and cooling are stopped at priority 5 bypassing any mini-
mum on times (minimum on times added by others, not part of the base
sequence).
One Cooling Stage
If the space temp rises above the active cooling setpoint plus the cooling
proportional band AND the rst stage of cooling has been o for at least
the minimum o time, the rst stage of cooling will be energized. Upon
decrease in space temp below the active cooling setpoint, the rst stage
of cooing shall be deenergized.
Two Cooling Stages
If the space temp rises above the active cooling setpoint plus one half the
cooling proportional band AND the rst stage of cooling has been o for
at least the minimum o time, the rst stage of cooling will be energized.
If the space temp further rises above the active cooling setpoint plus the
cooling proportional band AND the rst stage of cooling has been en-
ergized for at least the stage delay AND the second stage of cooling has
been o for at least the minimum o time, the second stage of cooling
will be energized. Upon decrease in space temp below the active cooling
setpoint plus one half the cooling proportional band, the second stage of
cooling shall be deenergized. Upon further decrease in space temp below
the active cooling setpoint, the rst stage of cooing shall be deenergized.
If at any time there is a low limit or fan fail alarm, all stages of cooling
and heating are deenergized.
• With the fan mode set to “Auto,” the heating valve will open
100% if the space temperature falls below active heating setpoint
minus heating proportional band and fully close when space
temp rises above active heating setpoint. The cooling valve simi-
larly opens 100% if the space temp rises above the active cooling
setpoint plus cooling proportional band and fully closes if the
space temp falls below the active cooling setpoint.
If at any time there is a low limit alarm, the cooling valve is forced
closed and the heating valve opens fully.
If at any time there is a fan failure alarm, the cooling and heating
valves are both forced closed.
Staged Heating and Cooling Parameters
On applications with staged heating and cooling, there will be a 3 min-
ute (adjustable) delay between calls for stages (stage delay). Once a stage
of heating or cooling turns o, there is a 3 minute (adjustable) minimum
o time before that stage’s output can be reenergized. Once all stages of
heating and cooling have turned o, the fan will remain energized for 3
minutes (adjustable, o delay).
One Heating Stage
If the space temperature drops below the active heating setpoint minus
the heating proportional band AND the rst stage of heating has been
o for at least the minimum o time, the rst stage of heating will be
energized. Upon rise in temperature above the active heating setpoint,
the rst stage of heating will be deenergized.
Two Heating Stages
If the space temperature drops below the active heating setpoint minus
one half the heating proportional band AND the rst stage of heating
has been o for at least the minimum o time, the rst stage of heating
will be energized. If the space temp further drops below the active heat-
ing setpoint minus the heating proportional band AND the rst stage of
heating has been energized for at least the stage delay AND the second
stage of heating has been o for at least the minimum o time, the sec-
ond stage of heating will be energized. Upon rise in temperature above
the active heating setpoint minus one half the heating proportional