I would like to change out my current Pentair WhisperFlo WF-24 single speed pump to a Pentair WhisperFlo WFDS-4 dual speed (Low @ 1725 RPM and High @ 3450 RPM) for energy savings. The current pump is controlled by Hayward/Goldline Aqua Plus automation unit.
The automation unit is also operated the 7 FAFCO Revolution solar panels (4 ft x 10 ft each panel): a) 4 panels are on the roof of first story; and b) 3 panels are on the roof of second story with the solar system vacuum relief valve (VRV) at the highest point. The solar pool heating system is temperature sensor operating system.
Below are information about pump timing and pump speed from the Aqua Plus Operation Manual:
Filter T1 Time
For two speed or variable speed pumps, this setting will be the period of time when the pump runs at high speed. If the high speed and low speed periods overlap, then the pump will operate in low speed during the overlap period.
Filter T2 Time
For two speed or variable speed pumps, this time clock will set the normal time period for filter pump low speed operation. If the filter pump was off prior to the start of this time period, the filter pump will first turn on at high speed for 3 minutes to prime and establish water flow. Afterwards, it will drop down to low speed for the remainder of the programmed low speed time period.
Allow Low Speed
This menu only appears if the pool filter is configured for 2-speed or variable speed operation. During default operation, high speed mode is used whenever the solar heater is on. If Allow Low Speed is enabled, low speed pump operation will be allowed during solar heating except for the first 3 minutes after solar heat turns on.
I am currently operating my single speed pump at only 4 hours a day during the winter; however, the pump is running between 7-8 hours during the summer because my pool solar is set at 92F. My house electric bill is very high during the summer months. I am planning to run the potential new 2-speed pump at Low Speed at all time, except for manually pool cleaning. Here are my questions:
1. Are 3 minutes of High Speed running long enough to prime my solar heating system?
2. Will I have any air issue with the solar VRV when the pump is at Low Speed running during the solar system is on?
Thanks in advance for all your help.