Tc5-Ita Operation; Basic Principle Of Operation - Airstream TC5-ITA User Manual

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 OPENING
(in seconds or
% of the Total
Opening Time)
TOTAL
OPENING TIME
CLOSED
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).
Opening of the Air Inlet
based on Ventilation Stages
STEP 1
STEP 0
0.4 °F
STEP 0
Stage 1
SET POINT
STEP 2
STEP 1
HI
Bandwidth Offset
Stage 2
starts starts
STEP 3
ROOM
Stage 3
TEMP.
starts
TC5-ITA rev.02
15