pick heaters 6X7 - Noisy Heater Operation

PICK VARIABLE FLOW SERVICE MANUAL
8
PROBLEM: Noisy Heater Operation.
OBSERVATION PROBABLE CAUSE ACTION PAGE
Air trapped in a high point
of the cold water supply or
the hot water header,
creating an unstable
condition
Bleed air from the
water system
Install automatic air
vent valve(s)
23
Distribution branches not
connected to the top of
water headers
Check connection of
distribution branches,
re-pipe if necessary
or
Add automatic air
bleeds at system high
points
23
USE-POINT control valves
opening or closing too
rapidly
-Readjust rapid-acting
control valves
-Adjust or repair valves
as necessary to allow
smooth operation
-Eliminate sources of
water pressure spikes or
upsets
Cross-connection between
the hot water line and
another water line
-Visually trace all lines
to locate possible cross-
connections
-Eliminate the cross-
connection with
installation of check
valves or other valving
Water and steam pressures
too close together
-Check operating
pressures
-Reduce water pressure
or increase steam
pressure
23
Unstable water pressure
valve in system
-Observe operation of
all valves with steam to
the heater turned off
-Adjust or replace
faulty valves as
necessary
Shock absorber or pulsation
dampener device in the
system
Remove all shock
absorber devices (surge
tank)
Continued next page
Supply water pressure may
be unstable
-With steam off,
inspect water supply
system or pressure, and
correct as necessary
-Install water pressure
control valve if
required