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RCA L Version 2.0 21
5.7 Counter Balance Springs
5.7.1 Pre-charging Springs
The springs must be pre-charged with the
door curtain in the up position. This pre
charge amount is listed on the spring bracket,
this should be should be stamped with
numbers for example 3 S and 4 T. With S
standing for the amount of pre-stretch in
inches and T for amount of pre turns. You
also stretch the spring at this time; this
amount is also located on the same tag. You
always charge in the up position as shown in
figure 13.
Installation
Figure 13