Secondary loop pump issue and solution

[Temp]

Local water main burst about an hour ago. Wife ran hot tap for some reason and drained the water so secondary loop pump was practically dry and making a noise. Currently all switched off hoping the pump isn't kna456d. 

 

Is it worth installing a pressure sensor to turn off the loop pump if the pressure drops? Anyone done something like this?

 

 

[JohnMo]

Do you have a check valve installed to stop reverse flow?

[Temp]

You mean on the secondary loop? 

 

Don't think we have. Are you thinking the loop pump might have sucked air in via the open tap? 

[JohnMo]

This is what our instructions said that came with the pump

 

When using pump models with pump housing code 65B (item 9 in Figure 3), use the G1/2 check valve (item 14 in Figure 3) supplied in the packaging. This prevents water from flowing through the pump backwards when any faucet is opened, thus causing damage. 
• When using a check valve other than the factory supplied one, pay attention to the 
appropriate closing pressure. 
• Install the check valve after the pump in the direction of flow, so that the arrows on the pump housing and on the check valve point in the same direction