Chapter 7 System Operation And Maintenance 49
Liebert.CRV+ Series Air Cooled Precision Air Conditioner User Manual
control board will start the humidification operation. The humidification control board adopts ON/OFF operation mode,
and it controls the humidification operation according to a programmed procedure. The humidification control board is
located in a metal box close to the humidifier and its interfaces are shown in Figure7-3.
C
o
n
d
u
c
ti
v
it
y
d
e
te
c
ti
n
g
H
u
m
id
if
ic
a
ti
o
n
s
e
tt
in
g
G
N
D
C
S
W
a
te
r
le
v
e
l
d
e
te
c
ti
n
g
O
u
tl
e
t
s
o
le
n
o
id
v
a
lv
e
D
ra
in
m
a
n
u
a
lly
A
la
rm
o
u
tp
u
t
Relay
control
Current
detecting
A
L
TLR
TLR
L
+
A
L
R
S
4
8
5
R
E
F
L
-
S
E
T
+
V
R
D
R
G
N
D
O
N
TAM
G
G0
L
S
E
V
1
G
E
V
2
R
e
m
o
te
O
N
/O
F
F
A
B
L
S
C
S
A
B
In
le
t
s
o
le
n
o
id
v
a
lv
e
2
4
V
p
o
w
e
r
in
p
u
t
Figure 7-3 Interface of humidification control board
7.7.2 Electrode Humidifier Replacement
As a consumable, the humidifier does not need regular cleaning. Because the sediment exists in the water drained
from the humidifier, the humidifier tray should be cleaned periodically to avoid clogging the tray and the drainage pipe.
The cleaning cycle varies with the water quality and humidification operation time. It is recommended to clean (when
necessary) the humidifier tray once a month. The humidifier tray is shown in Figure 7-4.
Figure 7-4 Humidifier tray
If the water stays entering the humidifier or the input voltage of the humidification electrode is normal, but the water
fails to boil. It indicates that the humidifier reaches its service life and needs to be replaced.
See the following procedures to replace the humidifier:
1. Turn off the humidifier by setting the humidity setpoint lower than the actual humidity in equipment room.
2. Place the RUN/DRAIN switch to DRAIN position to drain the humidifier forcibly.
3. Turn off the AC power.
4. Remove the connection cable of the humidification electrode and high water level probe from the canister.
Note
Canister and steam hose may be very hot! Allow time for the humidifier to cool before replacement.
