Delta "T" Systems
P/T4 Automatic/Manual A/C Fan Control System
P/T4 Automatic/Manual A/C Fan Control System

The P/T4 Series Ventilation Control System is a state-of-the-art digital ventilation control system designed and manufactured by Delta "T" Systems specifically for the rigors of the marine engine room.

Delta "T" Systems has supplied thousands of the P/T4 Fan Control Systems to vessels all over the world. This has given us the ability to refine and fine-tune this control system into the most reliable and robust system of its type in the world. Over the years, we have added the features that the captains and ship's engineers have requested to make the P/T4 the control system of choice for offshore vessels of every type.

The PT/4 may be run in automatic or manual mode. Normal operation for the P/T4 is in automatic mode, which starts up 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 inputs within the engine room.

This system includes a color touch screen Fan Control Interface with the ability to attach up to a total of ten remote displays. Also included is 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 Series System allows the variable speed control of two or more three-phase fans via a digital touch screen Fan Control Interface. The specific P/T4 System may be configured to accept single or three phase AC input power (50 or 60 Hz) to the ASDs (Adjustable Speed Drives), depending on the available power aboard the vessel. The ASDs allow the fan motors to be speed-controlled with full reversing capability, and virtually eliminates the high starting loads associated with typical single-phase fan installations.

The P/T4 is a demand-based system, which automatically operates the fans at levels that are optimum for cooling and combustion purposes. By automatically speed controlling the fans, the electrical loads and noise levels are kept to a minimum level based upon the prevailing operating conditions.

Auto Mode
When the main engines are started, the system automatically switches to Auto Mode, where 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) flow increases as temperature rises, the intake fan(s) speed will increase to supply the required airflow, thus maintaining the correct pressure and volume under any conditions. Among the features of the P/T4 fan control system is the automatic fire shutdown feature, which will shut down the fans in the event of an engine room fire.

Quiet Run
Upon main engine shut down, the ventilation system switches to the Quiet Run Mode which cools the engine room down with the exhaust fan(s) running at a user specified fixed speed. The intake fan(s) continue to run via pressure sensor input to maintain correct airflow. Once a user specified temperature has been reached, the fan(s) will stop thermostatically, lowering noise and electrical load levels.

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 situations. This mode of operation is not recommended for use when underway and the main engines are running.


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Application Data Worksheet