Section 6
MAINTENANCE
53
6.9 TROUBLESHOOTING - GUIDE (CONTINUED)
SYMPTOM PROBABLE CAUSE CORRECTIVE ACTION
VACUUM UNIT SHUTS
DOWN WITH DEMAND
PRESENT
(CONTINUED)
Discharge Temperature Switch
Open (Continued)
Clogged fluid pump suction strainer; clean.
Leaks in fluid pump suction pipe; tighten fit-
tings.
Inlet vacuum too low; adjust Sullicon spring to
increase vacuum below inlet valve.
Defective or Improperly Set Fluid
Pump or Cooling Fan Motor
Overload Relay
Adjust or replace.
Low Fluid Pressure Switch Open Low fluid level; add fluid.
Clogged fluid filter; replace the element.
Fluid pressure regulator set too low; adjust
or repair.
Fluid pump relief valve set too low or
defective; adjust or repair.
Clogged fluid pump suction strainer; clean.
Leaks in fluid pump suction piping; tighten
fittings.
Defective or improperly set fluid pressure
switch; adjust or replace.
Leak at fluid pump shaft seal; replace.
VACUUM UNIT WILL
NOT ATTAIN
REQUIRED
VACUUM
Gas Volume Introduced Into
System Too Great
Check system line for leaks or open valves.
Dirty Inlet Filter Check filter gauge and change or clean
element if required.
Vacuum Regulator or Vacuum
Switch (Dual Control Only) Out of
Adjustment
Adjust regulator according to controladjustment
instructions in the Maintenance section.
Defective Vacuum Regulator Check diaphragm and replace if necessary
(kit available).
Defective Sullicon Diaphragms Replace.
Sullicon Spring Out of Adjustment Restriction in system piping.
SYSTEM VACUUM
RISES ABOVE SET-
TING OF VACUUM
REGULATOR
Leak in Control System Causing
Loss of Vacuum or Air Signals
Leak in control system: tighten fittings. Loss of
vacuum or air signals: eliminate leak; replace
parts if required.
Defective Vacuum Regulator Check that diaphragm and seals are not dam-
aged. Replace if necessary.
Defective Sullicon Control Spring Replace.
Continued on page 54
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