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Startup
Liebert
®
CRV
™
42
9.3 Chilled Water Valve: Chilled Water Models
The 3-way valve controls the chilled water flow and operates as follows (refer to Figure 4):
• When the valve is fully open (i.e., maximum chilled water flow), the actuator slot is set to “1.”
• 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.
For more details, see the technical bulletin for chilled water valves and related actuators. Technical
bulletins are enclosed with documentation onboard the unit.
Figure 30 Position of the chilled water valve actuator (for 2- or 3-way valve)
9.4 Adjust Baffles to Direct Air Properly
The Liebert CRV has been equipped with an adjustable, modular supply air baffle system. The baffles
should be adjusted prior to start-up to direct air towards the racks the cooling unit is intended to
condition. Ideally, these should be the same racks the cooling unit is pulling hot air from. The baffles
can be readjusted at any time as cooling needs change.
The Liebert CRV is shipped with the baffles in an alternating pattern to direct cold air left and right.
This configuration should be used when the cooling unit is located between racks. If a Liebert CRV is
installed at the end of a row, all the baffles should be adjusted to blow air down the cold-aisle, toward
the racks. The baffle segments at the top of the panel will direct more air than the segments at the
bottom. The supply air will travel the furthest when all baffle segments are pointed in the same
direction, left or right.
NOTE
1. In the unlikely event of control system failure, the valve can be manually controlled with
the rotary knob. It can be used to drive the actuator into any position between 0 and 1.
2. When the actuator stem is completely down, the valve is open and chilled water coil is
supplied.
!
WARNING
Risk of electric shock. Can cause injury or death.
Disconnect all local and remote electric power supplies before working within.
Ensure that the Liebert CRV is shut down and power has been disconnected before beginning
any work on the unit.
0
1
0
1
Position indicator on
0 = CLOSED valve
(3-way valve: bypass open)
Position indicator on
1 = OPEN valve
(3-way valve: by-pass closed)