The numbers in the steps correspond to the numbers on the pump below, indicating the specific part being addressed. If you have any problems during this process, please don't hesitate to contact tech support at (800) 724-0046. You can also download a copy of the Snomax Troubleshooting Guide.

Open valve (1) on discharge plumbing, start the pump. Once a steady stream of water is bled out, close the valve.

Now isolate the calibration column by closing the ball valve on the main supply plumbing and check the draw out of the vertical calibration column to determine injection rate. MAKE sure to open main valve when complete. If it’s still not injecting, go to step 2.

2. CLEAN THE BOTTOM CHECK VALVE

Remove bottom check valve (2) to ensure that it’s free of debris. This allows the ball to seat properly to build pressure. Remove any debris; reattach the plumbing, making sure the white nylon washers in the pump head remain in place and that you put the ball and guide/cage in properly. Refer to diagram. Now reattach the plumbing, start pump, close main ball valve to isolate the calibration column to check injection rate. Make sure to open ball valve when complete. Nine times out of ten, this is the problem. If it’s still not injecting, continue to step 3.

3. CLEAN THE TOP CHECK VALVE

Remove top check valve (3) to ensure it’s free of debris and that the ball can seat properly. If it’s plugged, remove debris, reattach plumbing, start the pump, close main ball valve to isolate calibration column to check injection rate. Make sure to open ball valve when complete. If still not injecting, continue to step 4.

4. CHECK THE DIAPHRAGM

Checking the oil quality is often a good place to start to determine if your diaphragm has been cracked. If the oil is milky in color and consistency, the Snomax solution has passed into the pump chamber through the crack. To begin you'll need to remove the intake and discharge plumbing from the pump head, then remove the pump head (4) to check the integrity of the diaphragm and to clean the inside of the pump face. A small amount of oil will drain as you remove the head.

• If the diaphragm is cracked, you'll need to drain and change the pump oil. It's likely that water entered the pump case through the crack in the diaphragm.

• If the diaphragm is only warped it's not necessary to change the oil but you'll need to replace the diaphragm. Here is a list of common reasons for damaging a diaphragm.

5. PRIME THE OIL SIDE OF THE PUMP

This step is the trickiest and most important but if you take your time and follow these instructions, you should be good.

• Remove cap and using a flat head screwdriver, unscrew the threaded plug from the oil chamber (5).

• Remove spring from the oil chamber with the blade of the screwdriver.

• Using your funnel, tightly place/screw the funnel into the oil chamber. Ensure the fit is airtight. This is critical to prevent air from being drawn into the oil chamber.

• Fill the funnel with Snomax Pump Oil keeping the intake and discharge plumbing off.

• Start the pump to prime the oil chamber by bleeding out all the trapped air in the head. Run the pump at 100%, topping off the funnel with oil as necessary, until all air bubbles are bled out of the oil in the funnel. This should take approximately 30 seconds. Turn the pump stroke in and out a couple of times to help bleed out ALL the air. Turn off the pump and remove the funnel with oil in it.

• Place the oil spring back into oil chamber (5) immediately to prevent air from entering and screw the threaded plug into place. Tighten the plug until it stops and loosen by 1 turn. Replace cap.

Now that the diaphragm and head are back in place and the oil side is primed, reassemble the intake and discharge plumbing. Make sure the check valves (cage and ball) are seated in pump head properly. Make sure they white nylon washers are in place. The pump will not build pressure if this isn’t done properly. Using the calibration column, check the injection rate.

If the pump is still not injecting, curse loudly three times, then call your local representative or Johnson Controls technical Support at (800) 724-0046.