Specifications

Delta “T” Systems
www.deltatsystems.com
AC Fan Control Systems
P/T4 and T4 Fan Control Systems
Delta “T” Systems
600-T4 Automatic Ventilation
Con tro l System
IN STAL LATIO N &
OP ERATI ON M ANUAL
P ro p r i e t a r y M a t e r i a l - A l l R i g h t s R e s e r v e d - D e l t a “ T ” S y s t e m s, I n c . - C o p y r i g h t 2 0 0 9
P r o j e c t N u m b e r
Overview - The P/T4 and T4 Series Ventilation Control
Systems are state-of-the-art digital ventilation control
systems that are designed and manufactured specically
for the rigors of the marine engine room.
Delta “T” Systems has supplied thousands of the P/T4 and
T4 Fan Control Systems to vessels all over the world,
and has added the features that the captains and ship’s
engineers have requested to make the PT4 and T4
the control systems of choice for offshore vessels of
every type.
The P/T4 and the T4 each may be run in automatic or
manual mode. Normal operation is in automatic mode
which goes into effect as soon as the vessel’s engines
are started. In Automatic mode, engine room temperature
and combustion air intake are automatically controlled to
optimum levels based on temperature and pressure for the
P/T4, and by engine room temperature alone for the T4.
These systems include a color touch screen Fan Control
Interface (FCI) and an integrated alarm output that can
be connected to a vessel’s central alarm system. Help
screens and simplified parameter and monitoring screens
make operation and adjustment fast and easy. The
P/T4 and T4 Series Systems allows the variable speed
control of two or more three-phase fans via a digital touch
screen Fan Control Interface (FCI). Each system may
be congured to accept single or three phase AC
input power to the ASDs (Adjustable Speed Drives),
depending on the available power aboard the vessel.
Auto Mode: Both the P/T4 and the T4 systems start in
Auto Mode when the engines are started. When the P/
T4 system switches to Auto Mode, the exhaust fan(s)
speed is adjusted automatically as the temperature
increases, measured by a sensor located within the
engine room. The intake fan(s) speed is controlled by
an engine room pressure sensor. This sensor requires a
sensing tube to the outside atmosphere as well as to the
engine room space to measure the differential pressure.
As the engines demand greater volumes of air and the
exhaust fan(s) ow increases as temperature rises, the
intake fan(s) speed will increase to supply the required
airow, thus maintaining the correct pressure and volume
under any conditions.
In Auto Mode, the T4 system regulates both the intake and
exhaust fans based on engine room temperature alone.
Quiet Run: Upon main engine shut down, the P/T4
and the T4 ventilation control systems switch
to the Quiet Run Mode which cools the engine
room down at a user specied xed fan speed.
Once the user specied temperature has been
reached, the fans will stop thermostatically.
Manual Mode: In addition to the two automatic
modes of operation there is a Manual Mode. The Manual
Mode allows the operator to control the fan speed and
direction independently for maintenance or unusual situa-
tions. This mode of operation is not recommended for use
when underway and the main engines are running.
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