Section 6
MAINTENANCE
37
6.8 TROUBLESHOOTING GUIDE (CONTINUED)
SYMPTOM PROBABLE CAUSE REMEDY
VACUUM UNIT SHUTS
DOWN WITH VACUUM
DEMAND PRESENT
(CONTINUED)
Discharge Temperature Switch
Open (Continued)
Ambient temperature is too high; provide
sufficient ventilation.
Low fluid level; add fluid.
Clogged filter; change the fluid filter
element.
Thermal valve not functioning properly;
replace element.
Defective discharge temperature switch;
check for a short or open circuit to probe
and correct wiring.
Defective discharge temperature switch;
check for a short or open circuit to probe
and correct wiring.
Inlet vacuum too low; adjust Sullicon spring
and/or control linkage to increase vacuum to
a minimum of 15 in-Hg. below inlet valve.
Incorrect fan motor rotation; reverse any
two fan motor leads.
Tripped Fan Motor Overload Relay Investigate overcurrent cause.
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 pressure drop across filter and
change element if required.
Vacuum Regulator or Vacuum
Switch (Dual Control Only) Out
of Adjustment
Adjust regulator according to control
adjustment instructions in the Maintenance
section.
Defective Sullicon Diaphragms Replace.
Sullicon Spring Out of Adjustment Adjust (see Control System Adjustment in
Section 6, Maintenance).
Restriction in System Piping Flush system piping.
SYSTEM VACUUM
RISES ABOVE SET-
TING OF VACUUM
REGULATOR
Leak In Control System Causing
Loss of Vacuum or Air Signals
Check system for leaks. Replace as neces-
sary.
Defective Vacuum Regulator Check that diaphragm and seals are not
damaged. Replace if necessary.
Defective Sullicon Control Spring Replace.
EXCESSIVE FLUID
CONSUMPTION
Separator Element Damaged or
Not Functioning Properly
Change separator.
Leak in the Lubrication System Check all pipes, connections and
components.
Continued on page 38
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