Chilled Water Valve - Liebert himod Service Manual

S Filtered new air is injected into the air stream via
the Fresh Air Intake.
S The treated air passes through the fans, which op-
erate continuously, and is then dispersed out of the
unit.
S Under unit only: the air passes from the underfloor
void into the room via air distribution outlets.
For "UNDER" units installed on raised floor:
switch off the machine before removal of the floor
panels within a distance of 850 mm from the ma-
chine, to avoid risks of contact with rotating devices
(see Fig. 15).
N.B.: Manual control can be performed using the control
system (see Control manual).
7.1 −

Chilled water valve

The 3−way valve controls the chilled water flow. It op-
erates as follows (Fig. 14):
S When the valve is fully open (i.e. max. chilled water
flow) the actuator slot is set to '1'.
S When the valve is closed (i.e. no chilled water flow)
the actuator slot is set to '0'.
The valve running time is set to the value specified in
the Control Manual.
Note 1: In the unlikely event of control system failure,
the valve can be manually controlled by means of a 3
mm allen key placed into the actuator slot.
NEVER PERFORM THIS OPERATION USING A
SCREWDRIVER.
Note 2: For models 90−10−12−14 UC the chilled wa-
ter valve is not foreseen for the manual operation.
When actuator stem is completely down the valve is
closed (by−pass 100%), when actuator stem is com-
pletely up the valve is open (by−pass 0%) and all water
flows into the coil.
English
Fig. 14 − Position of the chilled water valve actuator
3
m
m
3 mm
Fig. 15 − Floor panels removal on a safety way
HIMOD−C
3 mm
Manual
ment with 3 mm al-
A
len key
B
B
A
Position indicator in
Position 0 = CLOSED
Valve Closed
(by−pass open)
Position indicator in
Position 1 = OPEN
Valve fully Open
(by−pass closed)
850 mm
adjust-
25