Operation of Dehumidifier


Objective: To establish a standard operating procedure for Dehumidifier (DHU)

Scope: This SOP is applicable for all the DHUs (Bry Air, Model: MVB 15BS, MVB 15B, FVB –3000, FLC-6200, FLC-5000 and FLC-2500) of (Company Name)

Responsibility:
1. Operator shall be Responsible to follow the procedure strictly.

2. Supervisor shall be responsible to ensure that the SOP is followed properly.

Accountability: Head of Engineering.

Precautions:
=>> Concerned personnel should be trained on the SOP
=>> Before starting the DHU ensure that the related AHU is running
=>> Check the door of the DHU. It should be properly closed.
=>> Check the position of chilled water inlet and outlet valves. They should be open. Check that the bypass valve is closed.

Procedure:
=>> Operational procedure for Model: MVB 15BS, MVB 15B and FVB –3000

Manual Operation:
To start the DHU, following steps are to be carried out sequentially:
=>> Check the position of reactivation air exhaust & process air supply damper. Both should be in particular position (open).
=>> Check the inlet steam pressure at steam heater coil where applicable.
=>> Select the “Manual” mode of operation from the MSSB panel.
=>> Switch “ON” the power from MSSB.
=>> Switch “ON” the circuit breaker from DHU control panel.
=>> Select the “Manual” mode of operation from the DHU control panel.
=>> Switch “ON” the system of DHU from control panel.
=>> Switch “ON” the heater of DHU (where applicable) from control panel.

To stop the DHU, following steps are to be carried out sequentially:
=>> Switch “OFF” the heater switch (where applicable) from DHU control panel.
=>> Wait atleast five minutes for the heater temperature to come down.
=>> Switch “OFF” the system switch of DHU control panel.
=>> Switch “OFF” the circuit breaker of DHU control panel.
=>> Switch “OFF” the power from the MSSB.

Operation Through BAS System:
=>> Check that the selector switch in the MSSB panel board is in “AUTO” mode.
=>> From the BAS control computer screen, enable the “DHU command”. Then the DHU will start automatically.
=>> Check the process fan and reactivation fan status. It should be “ON”.
=>> To switch “OFF” the DHU, disable the “DHU command” from the BAS control computer screen.

=>> Operational procedure for Model: FLC-6200, FLC-5000 and FLC-2500

To start the DHU following steps are to be carried out sequentially
=>> Check the position of reactivation air exhaust & process air supply damper. Both should be in particular position (open).
=>> Switch ON the power of Circuit breaker
=>> Select the “Auto or Manual” mode of operation from the DHU control pannel
=>> Push the “ON/OFF” button from control panel. (at that time it will be start )

To stop the DHU, following steps are to be carried out sequentially
=>> Push the “ON/OFF” button from control panel. (at that time it will be start )
=>> Switch OFF the circuit breaker.

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