Vapac, Virtuoso VE Humidifier, Installation Manual, EN 2024-01, D301474 Iss 0 Page No 53 of 80
FF
Fault
Possible Cause
Remedy / Action
Humidifier on line but does not
provide steam - no demand
No on / off demand signal from
VFC (if used as input - terminals 57
and 59)
Verify the requirement from / setting of the
control input
No 0-10V DC external demand
signal (if used as input - terminals
58 and 59)
Verify the requirement from / setting of the
control input
No demand from Humidity Sensor
(if used as input - terminals H0V,
H24V, 60, 61 and 62)
Verify the setting of the Humidity sensor. The
setting can be changed from commissioning
screen page 1
Fire stop / fire alarm interface
operated (if fitted - terminals 13
and 14)
Check the EPO / fire alarm interface for
operation and reset after investigating cause.
Airflow not detected by airflow
/ pressure switch (if used e.g.
humidifier is part of an AC or AHU
system - terminals 13 and 14)
Check the fan operation and reset after
investigating cause
Fan interlock operated (if fitted e.g.
humidifier is part of an AC or AHU
system - terminals 13 and 14)
Check the fan operation and reset after
investigating cause
High limit humidistat has operated
(if fitted - terminals 13 and 14)
Check the humidistat and reset after
investigating cause
Control wires are not properly
secured to the terminal blocks
Check and secure the connections of the
control wires to the terminal blocks
Humidifier on line but
inadequate or no steam
production
Cylinder fault
Inspect cylinder and elements. Replace as
necessary
No water in the steam cylinder
or humidifier does not stop
draining
Humidifier is being filled with water
but has not yet reached the water
high level sensor
Check that the drain pump is off
Check that the shut off valve on the water
supply line is fully open
Verify the operation of the fill valve
Humidifier is not being filled with
water
Check if the fill valve strainer (and strainer in
water supply to the unit if fitted) is blocked
and clean as required
Humidifier does not drain
Drain pump is clogged
Check and clean the drain pump if required
During a drain cycle, the water level
sensor has sensed that the water
level is not decreasing
Check that the drain pump is operating
correctly by using the manual drain facility.
Check the fill and drain water pipe
connections and remedy any fault found
Check the water level sensor is not
obstructed
Check operation of LSI PCB
"Service Due" at display
Service due
Carry out service then reset from service
mode page 2 on the touch screen
"Caution Alarm" at display
Caution alarm
Investigate cause of alarm, remedy any fault
found then reset alarm from service mode
page 2 on the touch screen.
"Critical Alarm" at display
Critical alarm
Investigate cause of alarm, remedy any fault
found then reset alarm from service mode
page 2 on the touch screen.
