Honeywell HON HSV086, Operation & Maintenance Manual, Page: 39 / 48

© 2017 Honeywell International Inc
Operation and maintenance manual HON HSV086 39
6 Failures
Failure Possible cause Solution
Switching device does
not or wrongly respond
at too low a pressure Setpoint spring for under-
pressure incorrectly set Repeat adjustment and
check threshold value
Handle H (figure 2) is not
horizontal at average value
of threshold value Place handle H horizontally
Switching device does
not or wrongly respond
at too high a pressure Setpoint spring for over-
pressure has been set
incorrectly Repeat adjustment and
check threshold value
Handle H (figuur 2) is not
horizontal at average value
of threshold value Place handle H horizontally
Switching device does
not respond without
the lower switch-on
pressure having been
reached Diaphragm in pressure
converter is fractured Check diaphragm in
pressure converter and
replace, if necessary
Valve cannot go up Pressure upstream and
downstream of the valve is
not yet or not fully in
equilibrium Equilibrate pressure using
the by-pass line
Control and switch
mechanism cannot be
reset Handle H (figure 2) is not
horizontal, so that switch pin
M cannot be locked Check that the pressure in
the pressure converter is
below the higher, resp.
above the lower threshold
value. If necessary, place
handle H horizontally.
After the valve has
dropped, the outlet
pressure increases Pressure converter seal is
leaking Inspect seal and seat of the
valve and, if necessary,
replace seal or seat
For HON HSVs equipped with accessories only
Switch in SVC086 and
K1 indication valve
position indicate valve
open. Indication valve
position on body cover
indicates valve closed. Proximity switch in valve
position indicator does not
function properly. Check locally whether valve
has dropped (check
indication position valve K1).
If necessary replace
proximity switch
Breaking of a cable Replace cable
Indication valve
position K1 and
indication on body
cover indicate valve
open, but valve
position indicator in
SVC086 indicates
valve closed (Proximity) switch valve
position indicator in SVC086
does not function properly Check locally whether valve
has dropped (check
indication position valve K1).
If necessary replace
proximity switch
Breaking of a cable Replace cable