Martel Electronics MECP500 - Manual (Page 2)

counterclockwise will decrease pressure. NOTE: The vacuum
reading increases when the vernier knob is turned
counterclockwise.
8. When the calibration procedure is completed, bleed the pressure
before disconnecting the unit. CAUTION: To prevent personal
injury, the pressure must be reduced to zero before
disconnecting any element of the system.
9. Store the unit in a carrying case or other safe location.
Pump Valve Assembly Cleaning Instructions
Occasionally, the MECP500 may not work properly due to dirt or other
contamination of the internal valve assembly. Use the following procedure
for cleaning the valve assembly. If this procedure does not fix the problem,
a repair kit (part number 1010043) may be ordered.
1. Using a small screwdriver, remove the 2 valve retention caps located
on opposite sides of the pump below the pressure/vacuum switch.
2. After the caps have been removed, gently remove the spring and o-
ring assembly.
3. Set aside the valve assemblies in a safe area and clean out the valve
body using a cotton swab soaked in IPA (isopropyl alcohol).
4. Repeat the process several times using a new cotton swab each time
until there is no remaining evidence of contamination or dirt.
5. Operate the pump handles several times and recheck for
contamination.
6. Clean the o-ring assembly and the o-ring on the retention caps with
IPA and inspect the o-rings closely for any damage or excessive wear.
Replacements are included in the repair kit, if needed.
7. Inspect the springs for wear or loss of tension. They should be
approximately 8.6 mm long in the relaxed state. If shorter, they may
not provide sufficient sealing tension. Replace if needed.
8. Once all parts have been cleaned and inspected, reinstall the o-ring
and spring assembly into the valve body.
9. Reinstall the retention caps and gently tighten each cap.
10. Seal the output port and operate the pump to at least 50% of
capacity.
11. Release the pressure and repeat several times to ensure that the o-
rings seat properly.
To prevent damage use a wrench
to hold the pump body when
attaching a gauge or fitting