FIGURE 7
Synchronized Dehumidification
Four units were
selected in setup for
Synchronized Dehum
HEAT
1
HEAT
3
5
6
SYNCHRONIZED DEHUM utilizes a pair of units. Unit 1 (of pair) will run in heat and Unit 2 (of pair) will run in cooling.
All dehum units MUST BE placed at the lowest number (1). Lead unit for dehum is always unit number 1 regardless of
rotation lead location.
NOTE:
Synchronized Dehum in pairs only, Mechanical Dehum 1 thru 6.
Manual 2100-746
Page
25 of 55
Synchronized Sequence (see Figure 7)
The controller will use 50% of the configured units
for heating and 50% of the configured units for
cooling for Synchronized Dehumidification. This
option will not be available unless there are at least
two configured units with electric heat capability.
Dehumidification will be limited to 2, 4, or 6 units.
These options will be selectable in the Equipment
Setup pages once Synchronized has been selected.
The controller will energize W1 + W2 on the units
allocated for heating and Y1 + Y2 on the units
allocated for cooling if dehumidification demand is
present. Unit allocation will begin with heating in the
lead unit and cooling in the first lag unit and continue
alternating until all available units are active. Stages
will increase according to the set point plus the inter-
stage differential. Synchronized Dehumidification will
only activate an even number of units (2, 4, or 6). If
configured to do so, the Aux. Out terminal will change
state for economizer disable.
If any configured unit is actively heating or cooling,
dehumidification will be unavailable until heating/
cooling demand is satisfied.
Humidification Operation
The controller will use the H terminal for control of
the humidification if configured. If configured for
humidification, H will energize when humidification is
required and de-energize once satisfied.
Staging
Staging in the MC5000 series controller can be
configured by the user in an alternating or non-
alternating format. In addition, heating or cooling
staging will consider space temperature, heating/
cooling set point and interstage differentials.
Humidification and dehumidification staging
will consider space humidity, humidification/
dehumidification set point and interstage differentials.
Staging Sequence
• Heating, cooling, dehumidification and
humidification will all use the same staging
structure in either a direct acting or reverse acting
manner.
• All staging will utilize a set point, interstage
differential, off differential, staging delay and
minimum on time.
Set Point: The starting point for each operation.
Interstage Differential: The temperature distance
between each stage.
Off Differential: This is how much a particular stage
needs to decrease from the on point before the stage
will turn off.
COOLING
2
COOLING
4
