TLV COS Series User Manual

7. Troubleshooting
This product is shipped after stringent checks and inspection and should perform its intended
function for a long period of time without failure. However, should there be any problem
encountered in the operation of the COS/COSR, consult the troubleshooting guide below.
Major causes for the above problems are usage under non-specified conditions (out of
specification), insufficient pressure, flow rate and clogs by dirt and scale.
To ensure performance for a long period of time, it is recommended that the Safety
Considerations and Adjustment sections be reviewed.
Problems are classified as follows:
1. Secondary pressure does not increase
2. Secondary pressure cannot be adjusted or increases abnormally
3. Hunting occurs (fluctuation in secondary pressure)
4. Chattering occurs (heavy mechanical noise)
5. Steam leaks from the steam trap or condensate is not discharged
6. Abnormal noises
Problem Symptom Cause Remedy
Troubleshooting Chart
Secondary
pressure
cannot be
adjusted or
increases
abnormally
Secondary
pressure
does not
rise
Adjustment is
difficult, and set
pressure varies
The body is warm,
but pressure does
not increase
The body is not
warm
The screens are clogged
The pilot screen is clogged
Piston is clogged with dirt
The piston ring is worn
There is insufficient steam
flow
The diaphragm is distorted
or damaged
There is a fluctuation in
steam consumption
Flow rate exceeds rated
flow rate
The adjustment screw has
seized
There is dirt build-up on the
sliding surfaces of the pilot
valve, piston or main valve
The selected model is
inappropriate for the service
conditions (specifications)
No steam is being supplied
or the inlet valve is closed
Clean or blow down
Clean
Clean; check the piston ring
Replace with a new piston
ring
The small hole on the piston
is clogged
Clean
Check the flow, replace the
COS/COSR if necessary
Replace with a new
diaphragm
Check the flow rate, replace
the COS/COSR if necessary
Check the flow rate, replace
with a larger size
Replace with a new
adjustment screw
Clean
Check the model selection,
replace the COS/COSR if
necessary
Check the valves
English
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TLV COS Series Specifications

General

Brand	TLV
Model	COS Series
Category	Control Unit
Language	English