Walchem WCT400 Instruction Manual download pdf (Page 28)

5.7 Bio1 and Bio2 Menus

These menus are only available on the WCT410 controller. The Bio 1 and Bio 2 menus are separate

from each other but operate in exactly the same way. Each menu provides the following independent

settings: Prog Bio Adds, Bio Pre-Bleed, Bio Lockout Time, Set Bio Mode, HOA. Bio menus may

display the following screens:

Bio 1 A

OFF

Indicates that the Bio 1 output is off.

Bio 1 A

PENDING

Indicates that Bio 1 is ready to begin a biocide cycle but is unable to begin due to NO FLOW,

or Bio 2 already ON.

Bio 1 A

PRE BLD

Indicates that Bio 1 is in the Pre-Bleed portion of its cycle.

Bio 1 A

4:50

Indicates that Bio 1 is adding and has 4 minutes and 50 seconds remaining to add, or that there

are 4 hours and 50 minutes of Bio 1 Lockout remaining. If the Bio 1 LED is ON, the timer is

for the Add. If the LED is OFF, the timer is for remaining lockout time.

Bio 1 A

NO FLOW

Indicates that there is no biocide activity and none is pending and that there is no flow past the

flow switch.

Note: When programming the unit for the first time, it is recommended that the Biocide Add Mode be

chosen first, then step through the rest of the Biocide Add menu indicated below and in figures 13 and

14. This will make programming simple and logical.

A number of built-in interlocks are part of the biocide feed program. When one biocide relay activates,

the other biocide will be locked out until the first biocide finishes its control cycle. Similarly, the bleed

relay is locked out once the biocide cycle begins (except for the pre-bleed portion of the cycle). Bear

this in mind, especially if the biocide feed time is very long or very frequent...very little time is left in

the day to control the conductivity.

The inhibitor feed relay interaction is more complex.

For Bleed and Feed mode

Since the bleed relay is locked out, the feed relay will be locked out as well.

For Feed as % Bleed

If the bleed is adjacent to the start of the biocide cycle, or is during the pre-bleed part of the

cycle, the feed time does not occur.

For Feed as % Time

The feed relay is locked out during the biocide add, the feed events are not stored in

memory, but the feed cycle time is reset once the biocide add cycle is over, so that as soon as

the biocide cycle is complete, one feed cycle will occur.

For Water Contactor or Paddlewheel

mode

The water flow is stored in memory, up to 256 contacts, and the correct feed time is activated

once the biocide cycle has completed.

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Walchem WCT400 Instruction Manual Page 28

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