February 26, 1997

GUIDE FOR SETTING WEIR PLATES AND LEVEL SWITCHES ON MILNOR CBW'S

Use this on 50 kg CBW's only, model 76032***.

1. Level Switches:
Level switches are used to insure proper water level for successful transfer in the CBW. They are also used for indicating level when modules are filled by a fast fill valve. There are varying settings of the level switch rod used in the field. However, in order for the rod to be long enough, they must be cut in the following manner:

a) Remove the clips from the rod.
b) Insert the rod through the level switch lever.
c) Let the float sit on the bottom of the float tube. If the machine is full of water, push the rod to the bottom of the float tube.
d) Hold down the level switch actuator, marking the rod at the top of the level switch actuator. (See sketch A of the attachment)
e) Place the float rod clips at the bottom and top of the rod, leaving 3" between the bottom clip and the top clip. (See sketch B of the attachment)

2. Weir Plates:
a) Water flows toward the front of the CBW in any zone. The level in the module is dictated by the weir plate (not the level switch). The factory settings of weir plates starts at the front of the zone (i.e. first module of the zone ) at an 8" weir setting. Each subsequent module will have a weir plate setting 1/2" higher than the previous module. If the module 2 is set at 8", module 3 will be set at 8 1/2", module 4 set at 9" (considering that these modules flow to each other).

b) Set a standing bath at 10" level. If module 2 has a flow not valve, set module 1 at the 8" weir wetting and module 2 at the 1/2" , etc.

NOTE: When flowing water through a CBW, there must be level over the weir in order to flow. As flow rates increase, the resultant level in each module goes higher. In some cases, the resultant level may e as much as 3" higher than the weir setting in a given module. On welded CBW's, the divider plate, between modules, is at the 14" water level. If the weir plate in module is set at 12" and the flow through the zone is set such that the level in the module is 3" higher than the weir plate, then obviously water would be able to flow over the divider in the module. This is counter productive to washing and should always be avoided.

This issue is most likely to surface in the last module of the rinse zone where water flow is highest and water level is traditionally set high. The result is sometimes water splashing or flowing over the divider into the last module where sour, softener (and sometimes starch) is applied. The result is a dilution of this bath which sometimes requires increased chemical dosing. If the wire setting is reduced in the rinse zone, this problem will simply disappear.


(This was submitted by Harold Daigle on 08/25/97)