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temperature point (OutTempLW + OutTempLW band) is
equal to 27
C, where the longest pulses (HOT) will be
o
applied, depending on the cooling demand (left column on
Screen E).
The cooling demand is expressed in % as shown in Graph
1. For each percentage range, there is an associated pulse
length range in seconds, as shown on Screen E. For example,
for a 0 to 20% cooling demand, the pulse length LOT is 6
seconds and HOT is 10 seconds. Then the associated pulse
length range is 6-10 seconds.
The next three graphs represent the settings as shown on
Screen D and Screen E.
Cooling demand (CD) changes pulse length
60
50
50
41
40
32
30
23
20
14
10
6
0%
20%
40%
COOLING DEMAND
Graph 5 Pulse length range vs cooling demand (according to
parameters on Screen E)
RANGE MODE
HOT
10
9
8
7
LOT
6
21
C
22
C
23
C
o
o
o
OUTSIDE TEMPERATURE
OutTempLW
Graph 6 Pulse length vs outside temperature (cooling demand
from 0 to 20%) (according to parameters on Screen D
and Screen E). The higher the OT, the longer the pulse
for the same cooling demand range.
8
HOT
LOT
Pulse length variation depending on OT
60%
80%
100%
PROP MODE
24
C
25
C
26
C
27
C
o
o
o
o
OutTempLW + OutTempLW band
HOT
20
18.5
17
15.5
LOT
14
21
C
22
C
o
o
OutTempLW
Graph 7 Pulse length vs outside temperature (cooling demand
from 20-40%). (according to parameters on Screen D
60
and Screen E) The higher the OT, the longer the pulse
for the same cooling demand range.
50
MODE SET TO PROP: According to Graph 5 and Graph 6,
if the cooling demand is from 0 to 20%, the pulse length will
40
be from 6 to 10 seconds. If the outside temperature is 22
30
or below, the pulse length will be 6 seconds (LOT). If the
outside temperature is 27
20
be 10 seconds (HOT). If the outside temperature is anywhere
between 22
C and 27
o
o
10
within the corresponding 6-10 sec. range.
As another example, according to Graph 5 and Graph 7,
0
if the cooling demand is from 20 to 40%, the pulse length
will be from 14 to 20 seconds. If the outside temperature is
22
C or below, the pulse length will be 14 seconds (LOT). If
o
the outside temp. is 27
20 seconds (HOT). If the outside temperature is within the
22
C-27
C range, the pulse length will be proportional within
o
o
the corresponding 14-20 sec. range.
MODE SET TO RANGE: According to Graph 5 and Graph
6, if the cooling demand is from 0 to 20%, the pulse length
will be either 6 or 10 seconds. If the outside temperature is
22
C or below, the pulse length will be 6 seconds (LOT). If
o
the outside temp. is 27
10 seconds (HOT). If OT rises and passes 22
remains at 6 seconds. If OT drops and passes 27
pulse remains at 10 seconds.
According to Graph 5 and Graph 7, if the cooling demand
is from 20 to 40%, the pulse length will be either 14 or 20
seconds. If the outside temperature is 22
pulse length will be 14 seconds (LOT). If the outside temp.
is 27
C or above, the pulse length will be 20 seconds (HOT).
o
If OT rises and passes 22
If OT drops and passes 27
NOTE: In these Proportional and Range examples, pulse
lengths are over a 60-sec. period (PER), which is adjustable
by the user.
Screen F is shown when Ladder 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).
RANGE
PROP
23
C
24
C
25
C
26
C
o
o
o
o
OUTSIDE TEMPERATURE
OutTempLW + OutTempLW band
C or above, the pulse length will
o
C, the pulse length will be proportional
C or above, the pulse length will be
o
C or above, the pulse length will be
o
C, the pulse
o
C or below, the
o
C, pulse remains at 14 seconds.
o
C, pulse remains at 20 seconds.
o
27
C
o
C
o
C, the
o
R
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