Can I make my wfe-6 a 2 speed pump?

adl6009 said:

I have the pump set to run at 2700 rpm for 4 hours, then 1700 for 20 hours. Seems to be ok so far, is that a reasonable schedule?

Click to expand...

Using the sample system curves, the flow at 2,730 rpm is estimated to be between about 63 gpm and 93 gpm.

Since the heater only needs 35 gpm, the pump speed is excessive and just wastes energy.

Assuming the system curve is not horrible, the speed should not need to exceed about 1,725 to 1,925 rpm even with the heater on.

Here is a chart showing the expected temperature rise from heater inlet to outlet based on flow in gpm.

Before starting the heater check to see if the heater water temperature display is the same as the SWG temperature display.

Once the heater is on, give the SWG temperature sensor time to stabilize at the new temperature.

When changing pump speed, allow the SWG temperature sensor to stabilize.

The temperature rise should not exceed 16 degrees.

If the temperature rise is more than 16 degrees, the water flow is too slow.

Hopefully, the pump gpm and the temperature rise data will be in agreement.

GPM.....Temp. rise

35.............15.9

40.............13.9

45.............12.4

50.............11.2

55.............10.1

60.............9.3

65.............8.6

70.............8.0

336,000 btu per hour heater temperature rise

It's not super important to get all the data.

The main thing is to make sure that the minimum flow rate is achieved when the heater is on.

There's no reason to go above 40 gpm.

You should be able to use the pump's control panel to check the flow in gpm.

The data would help fine tune the operation if it's easy enough to get.

Also, get the power usage in watts when you get the other data.