Bard MC5000 Series User Manual

Manual 2100-746
Page 31 of 55
Triples: Simultaneous Unit Operation
See Figure 16.
Using groups of three for the purpose of staging can
give the end user even tighter temperature control.
• Triples – Only available with six units. Units will
operate in sets of three.
FIGURE 16
Triples: Simultaneous Unit Operation
STAGE
1
Using groups of three can reduce the number of stages and maintain a tighter temperature band. With the twinning option,
the user can select All, Pairs or Triples.
NOTE: All units connected in "home run" configuration only.
STAGE
1
STAGE
1
STAGE
2
STAGE
2
STAGE
2
• Units will stage simultaneously in sets of three.
Units 1, 2 and 3 will be one set and units 4, 5 and
6 will be the second set.
• Lead would be units 1, 2, 3 & 4, 5, 6. Lead will
still rotate one unit at a time. When a unit in the
group is lead, that group is lead.
Cooling Sequence of Operation
The controller will utilize Y1 and Y2 to control cooling
for each configured unit. If the units are configured for
single stage cooling, Y1 will be energized for cooling
and Y2 will not be used. If the units are configured
for 2 stage cooling, Y1 will be energized for the first
stage and Y2 will be energized for the second stage for
each configured unit. Each terminal energized per unit
will count as a single stage for cooling staging logic.
Cooling stages may be either economizer or mechanical
cooling depending upon the unit's configuration.
Heating Sequence of Operation
Electric Heat
The controller will use the W1 and W2 terminals
to control conventional heating operation for each
configured unit. If units are configured for single
stage electric heat then W1 will be energized at each
configured unit and W2 will not be used. If units
are configured for 2 stage electric heat then W1 will
be energized first and W2 will be energized for an
additional stage of electric heat at each configured
unit. Each terminal energized will count as a single
stage for staging logic. If units are configured for heat
pump operation in conjunction with electric heat, the
electric heat (W1 & W2) will be added as additional
stages of heat with preference given to heat pump
stages.
Heat Pumps
The controller will use terminals Y1, Y2 and O/B
to control heat pump operation for each configured
unit. If units are configured for single stage heat
pump operation, Y1 will be energized and O/B will
be energized (or de-energized depending upon
configuration) for heat pump operation. If units are
configured for two stage heat pump operation, Y1 will
be energized and O/B will be energized (or de- energize
depending upon configuration) first and Y1, Y2 and
O/B will be energized (or de-energized depending upon
configuration) for an additional stage of heat pump
operation. O/B configuration will determine if O/B will
energize or de-energize for heat pump operation and
will be included in the Guided Setup options.

Bard MC5000 Series Specifications

General

Brand	Bard
Model	MC5000 Series
Category	Controller
Language	English