Programming the stages
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77
How variable heating stages work
When the temperature is above the
off at
temperature, the heater is off.
When the temperature drops below the
off at
temperature, the heater is at the
min heat
output.
The heater continues to operate at the
min heat
until the temperature drops to the
set point
.
When the temperature is between the
set point
and the
on full at
temperatures, the heater output
increases or decreases proportionally with the temperature.
When the temperature is below the
on full at
, the heater is at full output.
If you need to connect more heating elements than you have relays, and you are
not using all the variable stages, you can use any available variable stage as an
ON/OFF stage.
Set
min heat
to 100% and
off at
to the temperature at which you want the stage to
switch on/off.
You no longer have “variable” speed or power; you have either “
full on
”
or
“
full
off
”
, the same as a regular heating element. The
set point
and
on full at
settings
have no effect when you use a variable stage this way.
Temp
er
at
ur
e
Heater output
Heater output increases as the temperature drops, or
decreases as the temperature rises.
The heater is at full output.
The heater is at its min heat output.
The heater is off.
On full at
Off at
Min heat
Set point
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