FIGURE 9
Cooling with Six Single Stage Units (w/Economizers)
Heating Off Differential Off
59.0 59.5 60.0 60.5 61.0 61.5 62.0
58.0 58.5
Electric Heater 1
Electric Heater 2
FIGURE 8
Heating Staging
Stage 2
78.0 80.0 82.0 84.0 86.0 88.0
74.0 76.0
Stage 1
75.0
77.0 79.0 81.0 83.0 85.0
87.0
89.0
Stage 4
Stage 3
Stage 6
Stage 5
Stage 8
Stage 7
Stage 10
Stage 9
Stage 12
Stage 11
Cooling
Cooling Deadband
Off
Defaults
Setpoint: 77°F
Interstage Differential: 1°F
Off Differential: 2°F
Manual 2100-746
Page 26 of 55
Heating Staging
Heating staging begins when the space temperature
is less than the heating set point. Staging will
increase when the space temperature is less than the
heating set point and heating interstage differential
combined. Staging increases will continue each time
space temperature decreases greater than the heating
interstage differential setting. Heating stage decreases
will happen inversely to the staging increases.
Figure 8 illustrates a simple two stage sequence of
operation for heating with set point of 59.5°F, 1°F
interstage differential and 2°F off differential.
Cooling Staging
Cooling staging begins when the space temperature
is greater than the cooling set point. Staging will
increase when the space temperature is greater than
the cooling set point and cooling interstage differential
combined. Staging increases will continue each time
space temperature increases greater than the cooling
interstage differential setting. Cooling stage decreases
will happen inversely to the staging increases.
NOTE: If a Unit Power Loss or Lock Out Alarm is
present, the unit in alarm will not be considered in
staging sequence—it will be skipped.
Adjustable Interstage Differential (.5° TO 5°F)
User-selectable interstage differential based on
specific shelter applications. The first stage will cycle
on when crossing the set point. Subsequent stages
will be energized when crossing the set point plus the
differential for each stage until all required stages are
used. For example: 77°F set point/.5° differential.
Stage one is energized at 77.1°F, stage two at 77.6°F
and so on (default is 1°F).
Adjustable Off Differential (.5° TO 5°F)
User selectable off differential stages cycle off in
reverse order as the temperature crosses the on point
minus the off differential (default is 2°F).
Cooling with Economizer (Single Stage Compressor and
Economizer Available Alternating Sequence)
Figure 9 shows the temperature band from the set point
of 77°F to the last unit turning on in 11°F.
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