Unit installation

Startup
49
10.3 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 44 Position of the chilled water valve actuator (for 2- or 3-way valve)
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.
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)