Fläkt Woods
9206 GB 2011.11
4
Specifications are subject to alteration without notice
Maintenance
LQQA Humidifier, for circulated water
Water quality
Evaporation causes an increase in the concentration of
minerals in the circulating water, which necessitates
continuous bleed-off and make-up with fresh water.
The bleed-off rate is dependent on factors such as:
■
the pH of the water
■
the bicarbonate concentration (HCO3 ), mg/l
■
the calcium concentration (Ca2+), mg/l
This data can be obtained from a municipal water autho-
rity or by analysing the water.
Lime precipitation can be prevented by plotting the per-
tinent data in Chart 1 on page 4 to determine the current
risk zone. Water level monitor B can then be set according
to the relevant zone. If the water is too hard, it may be
necessary to subject it to partial softening.
In addition to the risk of lime precipitation, the concentra-
tion of chlorine (Cl) and copper (Cu) must be taken into
account. To ensure acceptable performance, the concen-
tration of Cl in the fresh water must not exceed 50 mg/l
and that of Cu must not exceed 0.02 mg/l.
To set the timer for emptying and flushing
For normal function, the timer should be preset to
”ON”. When emptying, which can be programmed to
occur once or several (optional) times every 24-hour
period, the timer will reset itself to the ”OFF” setting
for 10 minutes. After that, the timer will reset itself to
”ON” for 2 minutes to allow flushing.
The timer will then reset itself to the ”OFF” setting
for 3 minutes for additional emptying before resetting
itself back to ”ON” for normal operation.
In the following example, emptying and flushing
are required once every 24 hours from 12.00 to 12.15 as
scheduled below.
Period
Timer setting Activity
00.00–12.00
ON
Normal operation
12.00–12.10
OFF
Emptying
12.10–12.12
ON
Flushing
12.12–12.15
OFF
Additional emptying
12.15–24.00
ON
Normal operation
This can be done most easily by programming the ope-
ration times from 12.15 to 12.00 and from 12.10 to 12.12
on a daily basis! Emptying and additional emptying
will then occur from
