Raven Envizio Pro, Installation And Operation Manual

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Appendix A
198 Envizio Pro™ and Envizio Pro II® Installation and Operation Manual
Thus, as the volume per minute increases, the following tier switching should occur:
•
10 GPM [37.8 L/min] increasing to 20 GPM [75.7 L/min] = only tier 1 enabled
•
20 GPM [75.7 L/min] increasing to 30 GPM [113.6 L/min] = only tier 2 enabled
•
30 GPM [113.6 L/min] increasing to maximum flow rate = tier 1 and tier 2 enabled
Note:
Percent Tier Disable only affects tier switching when the required volume per minute is
decreasing.
As rates begin to decrease from maximum, the Percent Tier Disable value is figured in. Thus, using the Tier 2
Max of 30 GPM [113.6 L/min] previously calculated and with the Percent Tier Disable set to 10%, tier 1 and 2
will switch to only tier 2 when the target rate decreases to 27 GPM [102.2 L/min].
So, for rates in gallons per minute:
30 GPM – (10% of 30 GPM) = 30 GPM – 3 GPM = 27 GPM
or, for rates in liters per minute:
113.6 L/min – (10% of 113.6 L/min) = 113.6 L/min – 11.3 L/min = 102.3 L/min
In operation, as the volume per minute decreases, the following boom tier switching should occur.
•
Maximum flow rate decreasing to 27 GPM [102.2 L/min] = tier 1 and tier 2 enabled
•
27 GPM [102.2 L/min] decreasing to 18 GPM [68.1 L/min] = only tier 2 enabled
•
18 GPM [68.1 L/min] decreasing to 10 GPM [37.8 L/min] = only tier 1 enabled
1 2 1 2 1 2
10 - 20 GPM 20 - 30 GPM 30 GPM- Max. Flow
37.8 - 75.7 L/min 75.7 - 113.6 L/min 113.6 L/min - Max. Flow
1 2 1 2 1 2
Max. Flow - 27 GPM 27 - 18 GPM 18 - 10 GPM
Max. Flow - 102.2 L/min 102.2 - 68.1 L/min 68.1 - 37.8 L/min