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RANGE MODE
HOT
10
9
8
7
LOT
6
21
C
22
C
23
C
o
o
o
OUTSIDE TEMPERATURE
OutTempLW
Graph 3 Pulse length vs outside temperature (cooling demand
at 20%) (according to parameters on screens A and B).
The higher the OT, the longer the pulse for the same
cooling demand.
RANGE
HOT
34
32.5
31
29.5
LOT
28
22
C
21
C
23
C
o
o
o
OUTSIDE TEMPERATURE
OutTempLW
Graph 4 Pulse length vs outside temperature (cooling demand
at 60%) (according to parameters on screens A and B).
The higher the OT, the longer the pulse for the same
cooling demand.
MODE SET TO PROP: According to Graph 2 and Graph 3,
if the cooling demand is 20%, the pulse length will be from 6
to 10 seconds. If the outside temperature is 22
the pulse length will be 6 seconds (LOT). If the outside
temperature is 27
C or above, the pulse length will be 10
o
seconds (HOT). If the outside temperature is anywhere
between 22
C and 27
C, the pulse length will be proportional
o
o
within the corresponding 6-10 sec. range.
As another example, according to Graph 2 and Graph 4, if
the cooling demand is 60%, the pulse length will be from 28
to 34 seconds. If the outside temperature is 22
the pulse length will be 28 seconds (LOT). If the outside
temperature is 27
C or above, the pulse length will be 34
o
seconds (HOT). If the outside temperature is anywhere
between 22
C and 27
C, the pulse length will be proportional
o
o
within the corresponding 28-34 sec. range.
MODE SET TO RANGE: According to Graph 2 and Graph 3,
if the cooling demand is 20%, the pulse length will be either 6
or 10 seconds. If the outside temperature is 22
pulse length will be 6 seconds (LOT). If the outside temperature
is 27
C or above, the pulse length will be 10 seconds (HOT). If
o
OT rises and passes 22
C, the pulse remains at 6 seconds. If
o
OT drops and passes 27
C, the pulse remains at 10 seconds.
o
R
PROP MODE
24
C
25
C
26
C
27
C
o
o
o
o
OutTempLW + OutTempLW band
PROP
27
C
24
C
25
C
26
C
o
o
o
o
OutTempLW + OutTempLW band
C or below,
o
C or below,
o
C or below, the
o
According to Graph 2 and Graph 4, if the cooling demand is
60%, the pulse length will be either 28 or 34 seconds. If the
outside temperature is 22
o
be 28 seconds (LOT). If the outside temperature is 27
above, the pulse length will be 34 seconds (HOT). If OT rises
and passes 22
C, the pulse remains at 28 seconds. If OT
o
drops and passes 27
C, the pulse remains at 34 seconds.
o
NOTE: In these Proportional and Range examples, pulse
lengths are over a 60-sec. period (PER), which is adjustable
by the user.
Screen C is shown when Scaler is set. No parameters
can be modified here. It shows the resulting pulse lengths
according to the cooling demand percentages that were set
(in our example).
SYSTEM SPECS (SCALER)
Demand:
0%
020%
040%
060%
080%
100%
Screen C
LADDER
Screen D and Screen E show an example of a Ladder
configuration.
SYSTEM SPECIFICATIONS
Pulse length: Ladder
PumpON when CD is: 010%
OutTempLW:
OutTempLW band:
OutTempLW mode:
Screen D
SYSTEM SPECS (LADDER)
Demand:
LOT HOT PER
0%-020%
006-010/060s
020%-040%
014-020/060s
040%-060%
023-030/060s
060%-080%
032-040/060s
080%-100%
041-050/060s
100%
050-060/060s
Screen E
In this example, the OutTempLW is set to 22
corresponds to the low outside temperature point where
the shortest pulses (LOT) will be applied, depending on
the cooling demand (left column on Screen E). Since the
OutTempLW band is set to 5
C or below, the pulse length will
Pulse
008/060s
008/060s
020/060s
031/060s
043/060s
055/060s
22.0C
05.0C
Prop
C, which
o
C, then the high outside
o
7
C or
o
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