Water Flow Switches; Optiview Control Center Introduction; Control Panel - York YK Manual

FORM 160.75-EG1 (519)
Equipment Overview (Cont'd)

WATER FLOW SWITCHES

Thermal type water flow switches are factory mounted in the chilled and condenser water
nozzles, and are factory wired to the OptiView™ control panel. These solid-state flow sen-
sors have a small internal heating-element. They use the cooling effect of the flowing fluid
to sense when an adequate flow rate has been established. The sealed sensor probe is
316 stainless steel, which is suited to very high working pressures.
OPTIVIEW™ CONTROL CENTER
The chiller is controlled by a stand-alone microprocessor based control center. The chiller
control panel provides control of chiller operation and monitoring of chiller sensors, actua-
tors, relays and switches.

Control Panel

The control panel includes a 10.4-in. (264 mm) diagonal color liquid crystal display (LCD)
surrounded by "soft" keys which are redefined based on the screen displayed at that
time, mounted in the middle of a keypad interface and installed in a locked enclosure.
The screen details all operations and parameters, using a graphical representation of the
chiller and its major components. Panel verbiage is available in eight languages and can
be changed on the fly without having to turn off the chiller. Data can be displayed in either
English or Metric units. Smart Freeze Point Protection will run the chiller at 36°F (2.2°C)
leaving chilled water temperature, and not have nuisance trips on low water temperature.
The sophisticated program and sensor monitors the chiller water temperature to prevent
freeze-up. When needed, Hot Gas Bypass is available as an option. The panel displays
countdown timer messages so the operator knows when functions are starting and stop-
ping. Every programmable point has a pop-up screen with the allowable ranges, so that
the chiller cannot be programmed to operate outside of its design limits.
The chiller control panel also provides:
A. System operating information including:
1. Return and leaving chilled water temperature
2. Return and leaving condenser water temperature
3. Evaporator and condenser saturation pressure
4. Differential oil pressure
5. Percent motor current
6. Evaporator and condenser saturation temperature
7. Compressor discharge temperature
8. Oil reservoir temperature
9. Compressor thrust bearing positioning (K compressors only)
10. Operating hours
11. Number of compressor starts
12 JOHNSON CONTROLS