iGrow 1800 Installation Guide
Page4
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Ramping
In addition, you have the option of a temperature
ramp
between the setpoints. Each setpoint time period ends
with a Ramp time. The benefit of ramping allows for you to make smooth transitions within the greenhouse so
that the plants don’t experience temperature shock. Ramping also saves energy, which translates directly into
lower operating costs.
In the example below, the start time is 8:00a with a 30-minute ramp time. The ramp time enables a smooth
transition of the target temperatures between the setpoint time periods. Of course, the ramp times can be set to
0 and in this case there will be an immediate step transition in the set points. This is best explained by the
illustration shown below.
12am
1
2
3
4
5
6
7
8
9
10
11 12pm
1
2
3
4
5
8
6
7
9
10
11
65°F
70°F
75°F
Setpt 1
72.5°F
Setpt 1
68.0°F
Setpt 2
70.5°F
B
egin
n
in
g o
f
R
am
p
ti
me
8:
00
am
En
d
o
f
R
am
p
ti
me
9:
00
am
Cool Stage 1
Cool Stage 2
Cool Stage 3
Cool Stage 4
Heat Stage 1
Heat Stage 2
Setpt 2
67.0°F
En
d
o
f
R
am
p
ti
me
6
:3
0pm
B
egin
n
in
g o
f
R
am
p
ti
me
6
:0
0pm
1°F Deadbands
in this Example:
Setpoint 1
is set to 9:00am with a 30minute Ramp, Temp is set as 68 to 72.5
°
F
Setpoint 2
is set to 6:30pm with a 60minute Ramp, Temp is set as 67 to 70.5
°
F
Figure 2.1 Example of Setpoints, Staging, & Deadbands
Normal
Temp
Range
