PICK VARIABLE FLOW SERVICE MANUAL
7
Malfunction in the pump
look check valve
Inspect and repair
check valve as
necessary
Capacity of heater is
exceeded
Consult Pick Heaters
for heater upgrade
information
Faulty temperature
controller
Repair or replace
controller
21
Boiler or supply not
adequately sized to provide
enough steam to
accommodate all demands
in the steam system
Check steam supply
sizing and boiler for
pressure fluctuations
22 Steam inlet pressure
varies
Steam quality may be poor
(excess condensate
entrained in system)
Install a drip leg with a
steam trap upstream of
the strainer, to maintain
high quality steam at
the heater.
See
Installation
Manual
Steam valve packing gland
too tight
Adjust steam valve
stem packing gland
21
Steam valve has a
jerky motion
Air leak in the control line -Use Soap solution to
detect any leaks
-Repair leaks or replace
line
21
Optional temperature
controller not properly tuned
*(PID Parameters)
Tune the controller per
controller manual.
Injection tube problem
Stuck piston
Plugged Orifices
Broken spring
Refer to detailed
instructions for
disassembly and
inspection of the heater
and injection tube
12-14
Air or gas trapped in a high
point of the supply or the
discharge piping creating an
unstable condition
-Bleed air from the
system
-Remove surge tank
-Install automatic air
vent valve(s) at system
high points
23
Steam valve oscillates
*PID- Proportional
Integral Derivative,
the tuning parameters
on some electronic
and pneumatic
temperature
controllers
Water and steam pressures
too close together
Check operating
pressures
Reduce water pressure
or increase steam
pressure
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