SPA
Page 55
7.3.2
Explanation of Jumper Functions
Jumper A
The standard setting for this jumper is open.
Jumper B
The standard setting for this jumper is open.
Jumper C
The standard setting for this jumper is open.
Jumper D / Stand-By Blow-Down Off
If this jumper is not jumpered, the “stand-by blow-down” function is
active.
If the remote switch/safety interlock is open for a long while, an auto-
matic stand-by complete blow-down occurs after a set period (24
hours).
The standard setting for the “stand-by blow-down” function is active.
Jumper E / Main Contactor Switched Off at Blow-Down
(Function only valid for electrode steam humidifiers)
The state of the circuit for the main contactor is specified with Jumper
E.
Main contactor on:
Jumper open
(standard setting)
Main contactor off:
Jumper jumpered
The setting “main contactor off” specifies that the electrodes are dis-
connected from the power supply during blow-down. This setting may
be advisable if the power line is run through a residual current circuit
breaker (FI).
Jumper F / Less Frequent Partial Blow-Down (-50%)
If this jumper is jumpered, the “less frequent partial blow-down (-50%)”
function is active.
The control periodically performs a partial draining of the cylinder (par-
tial blow-down) in order to dilute the cylinder water; salt concentrates in
it during routine operation because only pure water is evaporated.
If less conductive feed water is used ( = lower salt content), it may be
advisable to perform partial blow-downs less often to ensure that the
humidifier always attains nominal steam output efficiently (only applies
to electrode steam humidifiers).
Before modifying this parameter, please consult with HygroMatik.
