User manual

SEC-HD user manual Programming the parameters
31
 If you need to connect more cooling elements than you have relays available,
and you are not using both variable stages, you can use an available variable
stage as an ON/OFF stage (for 120/230 VAC-powered equipment only).
 Set the Idle speed to 100% and Idle range to the temperature at which you want
the stage to switch on/off. You no longer have “variable” speed or power;
instead, you have either "full on" or "full off", the same as a regular cooling stage.
The Set point and Differential settings have no effect when you use a variable
stage this way.
 The Set point and Differential settings must be greater than the idle range .
To program variable stage settings
The examples in the following procedure use program A and variable stage 1.
 Program A displays as
a p r
, program B displays as
b p r
, program C displays
as
C p r
, and so on.
 Variable stage 1 uses Program settings menu items 2, 3, 4, and 5. For variable
stage 2, use menu items 6, 7, 8, and 9.
1. Press Program until the program you want to adjust displays, for
example
A pr
for program A.
2. Press Select.
The display shows
Π0
, the first item in the Program menu.
3. Press Up until the setting you want to adjust displays, for example
Π2
for Stage 1 idle speed and then press Select.
The display shows the current setting.
4. Press Up or Down to adjust the setting and then press Select.
The control returns to the Program menu.
5. Repeat steps 3 to 4 for each setting you want to adjust.
6. To return to the Main menu, press Back once. To return to the
Main display, press Back twice.
Programming relay stages, parameters 10 to 14
There are two types of heating and cooling stage setups: normal and proportional . Normal is
available for stages 3 to 5. Proportional is available only for stage 5.
For a detailed description of how normal settings work together with all others, read Understanding
how the SEC-HD operates on page 26.
A pr
Π2
* 20