Troubleshooting Tables - pick heaters 6X7 Service Manual

PICK VARIABLE FLOW SERVICE MANUAL
TROUBLESHOOTING
Pick heaters rarely require troubleshooting or repair, thanks to the simplicity of design and
operation. Many apparent difficulties with heater operation are actually the result of a problem or
adverse condition in the steam supply system, or product supply and distribution lines.
The following pages are to direct the technician through a logical approach for system
troubleshooting. General problem are shown in the header of each table. Key physical
observations are listed in the OBSERVATION column. PROBABLE CAUSE is the likely cause
of the problem and ACTION indicates the suggested operation to resolve the problem. The PAGE
column directs the technician to additional service or repaid instructions for the suggested action,
if applicable.
If you are not able to solve a problem with your heater as described in these pages, or if your
problem is not cocered in this manual, please contact your local Pick representative or call Pick
Heaters at (800) 233-9030. (Outside the US and Canada, call 262-338-1191 or Fax 262-338-
8489.)
PROBLEM: Heater will not heat liquid to the desired temperature.
OBSERVATION
Steam control valve is
FULL CLOSED
Steam control valve is
PARTIALLY OPEN
Steam control valves
is FULL OPEN
PROBABLE CAUSE
Insufficient supply air
pressure
Temperature controller
problem
RTD failure, or polarity on
I-to-P Transducer (+/-) may
be reversed (optional
electronic controller only)
Improper controller
calibration
Inadequate air pressure
I-to-P tranducer calibration
(optional)
Steam valve actuator spring
out of adjustment
Water flow is higher than
originally specified
ACTION
Check air supply, set
filter regulator at 20 psi
Check temperature
controller components
and air supply. See
separate manual for
optional temperature
controller.
Check wiring for loose
connections, refer to
separate manuals for
wiring diagrams.
Increase controller
setting and re-calibrate
Check air pressure
supplied, set filter
regulator at 20 psi
Calibrate I-to-P per
separate manual
Adjust actuator per
separate manual
Reduce water flow rate
Check specifications on
heater order, compare
to actual operating
conditions
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