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TC5-ITA
TC5-ITA rev.02
Programming Inlet Openings
Once the calibration is completed, you must assign an inlet position to each
ventilation stage of the environment controller. This position can either be
specified as a moving time of the actuator or as a percentage of the total run
time, depending on the chosen option (see OPENING DISPLAY chapter).
BEFORE PROGRAMMING INLET OPENINGS
•
Install a static pressure measuring device or determine in advance
the position required at each reference point by calculating, ac-
cording to the fan airflow, the opening that will maintain the de-
sired air speed at the inlet.
•
Enter the total opening time of the inlet of each TC5-ITA unit.
PROGRAMMING INLET OPENINGS:
•
Select "
PROGRAMMING
" using the function selection buttons (note
that this menu is not available during the calibration) The opening
time or the inlet position (in %) associated with step 0 is displayed.
Moving times are displayed as follows:
- A negative time value signals a closing time;
- A positive time value signals an opening time;
- The word
"Off"
means that the inlet completely closes once
the temperature controller reaches the selected step.
•
Use the adjustment buttons to specify the opening time or the inlet
position (%) associated with step 0 (if required).
•
Press the right-arrow key to select the next step.
•
Use the adjustment buttons to specify the opening time that needs
to be added to the previous opening, or to specify the inlet opening
(in %) associated with the selected step.
•
Proceed in similar fashion for all steps.
15
TC5-ITA rev.02
TC5-ITA OPERATION
Basic Principle of Operation
The TC5-ITA operates in combination with an environment controller. It
adjusts the air inlet opening according to the ventilation level provided by
this controller. As the temperature increases and new stages are acti-
vated, the inlet is opened or closed accordingly. The user must assign a
moving time or an opening percentage to each ventilation stage (or refer-
ence point) of the environment controller.
The opening time (or %) of Step 0 defines the initial position of the air inlet
and corresponds to a room temperature of 0.4°F (0.2°C) below the con-
troller set point. This normally corresponds to the minimum ventilation cycle.
Inlet & Tunnel Modes:
When the last reference point is reached, the TC5-ITA can either open the
air inlet according to a user-defined value (internal switch #12 to OFF), or
it can fully open the air inlet up until the inlet reaches its limit switch
(internal switch #12 to ON).
INLET OPENING
(in seconds or
% of the Total
Opening Time)
TOTAL
OPENING TIME
CLOSED
STEP 0
Stage 1
starts
ROOM
TEMP.
SET POINT
0.4 °F
Bandwidth Offset
Stage 2
starts
STEP 1
HI
STEP 2
Stage 3
starts
STEP 1
STEP 0
STEP 3
Opening of the Air Inlet
based on Ventilation Stages
