Bard MC500 Series User Manual

Manual 2100-746D
Page 28 of 59
Humidication/Dehumidication Demand Staging
Humidication staging begins when the space humidity
is less than the humidication set point. Staging will
increase when the space humidity is less than the
humidication set point and humidication interstage
differential combined. Staging increases will continue
each time space humidity decreases greater than
the humidication interstage differential setting.
Humidication stage decreases will happen inversely to
the staging increases.
Dehumidication staging begins when the space
humidity is greater than the dehumidication set
point. Staging will increase when the space humidity
is greater than the dehumidication set point and
dehumidication interstage differential combined.
Staging increases will continue each time space
humidity increases greater than the dehumidication
interstage differential setting. Dehumidication
stage decreases will happen inversely to the staging
increases.
Alternating and Non-Alternating Setup
Alternating/Non-Alternating Logic
The MC5000 series controller offers two staging
sequence options: Alternating (default) or Non-
Alternating.
Alternating
Alternating Logic will be the default for this controller.
In the Alternating Logic stage, increases will start
with the lead unit for the rst stage and then alternate
to the next available unit for sequential stages.
Decreases in staging will happen in the exact opposite
sequence. See example of a 3-unit system with 2 stage
compressor and economizer in Table 2.
Non-Alternating
Non-Alternating Logic stage increases will start with
the lead unit and exhaust all available stages prior to
staging the next unit. Decreases in staging will happen
in the exact opposite sequence. See example of a
3-unit system with 2 stage compressor and economizer
in Table 3.
TABLE 2
Alternating Logic: 3-Unit System with 2 Stage
Compressor and Economizer
Stage Unit 1 Unit 2 Unit 3
1 Y1 OFF OFF
2 Y1 Y1 OFF
3 Y1 Y1 Y1
4 Y1, Y2 Y1 Y1
5 Y1, Y2 Y1, Y2 Y1
6 Y1, Y2 Y1, Y2 Y1, Y2
TABLE 3
Non-Alternating Logic: 3-Unit System with 2 Stage
Compressor and Economizer
Stage Unit 1 Unit 2 Unit 3
1 Y1 OFF OFF
2 Y1, Y2 OFF OFF
3 Y1, Y2 Y1 OFF
4 Y1, Y2 Y1, Y2 OFF
5 Y1, Y2 Y1, Y2 Y1
6 Y1, Y2 Y1, Y2 Y1, Y2

Bard MC500 Series Specifications

General

Brand	Bard
Model	MC500 Series
Category	Controller
Language	English