IOM / ROOFTOP BALTIC Series - 0704-E Page 85
REACTIVITY : 3
DELTA +5
15%
75% 100%
DELTA +3
9%
45% 90%
DELTA +1
1% 15% 30%
1MIN 5MIN 10MIN
REACTIVITY : 6
DELTA +5
30%
100% 100%
DELTA +3
18%
90% 100%
DELTA +1
2% 30%
60%
1MIN 5MIN 10MIN
control software features
CLIMATIC 50 SOFTWARE FEATURES AND LOGIC
As a standard feature, CLIMATIC™50 provides 4
scheduling time zones per day on 7 days. On each of the 4
time zones, heating set point, cooling set point, minimum
fresh air, humidity set point high and up, and even the
different authorisations for cooling and heating can be
adjusted.
CLIMATIC™ 50 provides a choice of different remote
displays depending on customer requirement and applica-
tion of the system. As a standard feature, it is possible to
set alarms (adjustable value low and high) on room
temperature and humidity.
CONTROL SOFTWARE LOGIC
With the CLIMATIC™ 50 Lennox is going away from the
traditional step control
Capacity factor
It is used to determine the exact capacity required at any
time in order to react quicker and more accurately to any
change in demand.
The capacity factor is a percentage of the total cooling or
heating capacity.
Example:
On a three circuit rooftop unit with two compressors
running out of three has a capacity factor of 66%
In the same way, a three circuit rooftop with a modulating
electric heater running at 20% of its full capacity has a CF:
CF = 25%+25%+25%+5% = 80%
The Capacity factor will increase, decrease, or freeze
depending on the temperature difference between the set
point and the room temperature but also on the way this
room temperature is changing:
Reactivity.
The reactivity determines how fast the capacity factor
should vary.
It is given in: Percentage of capacity / Degree °C ( Room
Temp. VS Set Point) / minute
Example :
If the reactivity is set to 3 % / °C / min
Then:
Capacity factor can go from 0 to 30% in 10 minutes if Delta
Room Temp. VS Set Point is 1°C
Or capacity factor will go from 0 to 60 % in 4 minutes if
Delta Room Temp. VS Set Point is 5°C
The reactivity can be adjusted with the CLIMATIC™ 50 The
larger the reactivity the faster the rooftop will react to a
change.
The next table shows the effect of a change of the reactivity
on the capacity factor: This shows that by increasing the
reactivity, the unit reaches the set point quicker but the
energy consumption (capacity factor) is larger.
Delta vs
room set Room Cap. COMP COMP COMP
point Temp. factor 1 2 3
+0 Increasing 0% OFF OFF OFF
+1 Increasing 35% ON OFF OFF
+2 Increasing 70% ON ON OFF
+3 Increasing 100% ON ON ON
+2 Decreasing 100% ON ON ON
+1 Decreasing 100% ON ON ON
0 Decreasing 100% ON ON ON
-1 Decreasing 60% ON ON OFF
0 Increasing 60% ON ON OFF
Example:
The room set point is 25°C with a 3 compressor unit.
0
-2
+2
-4
+4
CAPACITY
FACTOR IS
FROZEN
CAPACITY FACTOR
IS
INCREASED
(ADD CAPACITY)
CAPACITY FACTOR
IS
DECREASED
(REDUCE CAPACITY)
CAPACITY
FACTOR IS
FROZEN
∆ Room Temp / Set Point
Room Temp / Decreasing
Room Temp / Increasing
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