Universal Pump Service Manual
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14. Replace screw holding the ba ery connector (Figure 4, #2) and tighten.
15. Reinsert the ba ery, turn on the pump, and test the keypad (if applicable).
16. If the keypad is working properly, peel off the keypad backing to expose the adhesive, align it with the
indentations on the front of the pump, and adhere it to the pump case.
Not applicable to 44XR model.
17. Align and re-adhere the foam padding on top of the control board (Figure 8).
18. Replace the bu on cap on the side of the pump housing.
19. Align the control board wires with the right side of the stack (Figure 8).
20. Look for the original bend in the wiring and fold accordingly.
21. Loop the wiring around the bo om of the stack toward the le! .
22. Fit the fl owmeter assembly under the orange and yellow wires a ached to the motor and place the fl owmeter so
that it faces the window in the front case of the pump (Figure 1, #13).
23. A ach the short section of black rubber tubing on the fl owmeter to the stack (regulator) inlet (Figure 2, #14).
24. Loop the longer black rubber tubing that a aches the fl owmeter to the fi lter housing assembly under the yellow
and orange wires and over the motor. Slide the fi lter housing assembly into place (Figure 8).
25. Ensure that the stack is seated fi rmly and that it is level before replacing the back pump cover.
26. Recheck the pump for leaks (
see Functional Testing, Initial Leak Check
). If it leaks,
see Pump Disassembly, Locating and
Correcting Leaks.
27. Set the fl ow compensation (
see Reassembly, Se! ing Flow Compensation
).
Setting Flow Compensation
Compensation is factory preset. SKC recommends that compensation be checked periodically during routine maintenance
to assure pump accuracy. Flow compensation will need to be reset if non-factory repairs have been made. Do not set fl ow
compensation unless the ba! ery voltage is at least 6.1 volts.
Completely reassemble the pump before se ing fl ow compensation (
see Pump Reassembly).
1. Remove the compensation pot access screws from the le! side of the pump (Figure 1, #2 and 3).
2. Connect the fi lter housing inlet (Figure 1, #9) to the magnehelic gauge outlet and ensure minimum back pressure.
3. Turn on the pump.
4. Using a small fl at-head screwdriver, carefully adjust the high compensation pot (Figure 1, #3) for minimum fl ow.
The high compensation pot is also known as pot B. This is a 3/4-turn pot. It needs only a slight turn to
affect the pump fl ow. Consistently turning it too far can cause damage to the pot.
5. Turn the fl ow adjust pot on the front of the pump (Figure 1, #7) until the dual-ball rotameter reads 2000 ml/min.
6. Adjust the high compensation pot until the dual-ball rotameter reads 2100 ml/min.
7. Turn the fl ow adjust pot until the dual-ball rotameter reads 1000 ml/min.
8. Apply forty inches of water back pressure.
9. Adjust the low compensation pot (Figure 1, #2) to correct any deviation from 1000 ml/min.
The low compensation pot is also known as pot A. This is a 3/4-turn pot. It needs only a slight turn to
affect the pump fl ow. Consistently turning it too far can cause damage to the pot.
10. Turn the fl ow adjust pot until the dual-ball rotameter reads 2000 ml/min.
11. Apply 40 inches of water back pressure and note the fl ow.
12. If the fl ow does not change by more than 5%, check the fl ow and back pressure as indicated on the calibration
sheet found at the back of this manual. If all measurements are found to be within 5% of the nominal value, the
compensation has been set correctly.
13. If the fl ow noted in Step 11 changed by more than 5%, note the amount of increase or decrease. Release the back
pressure, and adjust the high compensation pot to cause the fl ow to change in the same direction and amount as
noted in 11. Repeat Steps 11 through 13 until the fl ow remains within 5%. Go back to Step 7 and repeat each step
up to Step 13.
