Safety Stop; Operating Logs; Fault Shutdowns; Figure 4 - Liquid Chiller Log Sheets - York YMC2 Operation And Maintenance

SECTION 2 - SYSTEM OPERATING PROCEDURES

SAFETY STOP

When depressed, the chiller will not run under any
condition. For safety reasons, this position is required
for many maintenance tasks to be completed. The safe-
ty stop button must be rotated clockwise to release the
stop condition. The safety stop is not intended for nor-
mal shutdown of the chiller. If used an immediate stop
occurs, which by passes the programmed controlled
shutdown.

OPERATING LOGS

A permanent daily record of system operating condi-
tions (temperatures and pressures) recorded at regular
intervals throughout each 24-hour operating period
should be kept. Automatic data logging is possible by
connecting the optional printer and programming the
DATA LOGGER function. An optional status printer
is available for this purpose. Figure 4 on page 22
shows an example log sheet used by Johnson Controls
Personnel for recording test data on chiller systems.
Log sheets are available in pads of 50 sheets and may
be obtained through the nearest Johnson Controls of-
fice.
DATE
TIME
Hour Meter Reading
O.A. Temperature Dry Bulb / Wet Bulb
Bearing Controller
* NOTE: A pad of 50 log sheets can be ordered from your local Johnson Controls branch by

FIGURE 4 - LIQUID CHILLER LOG SHEETS

22
LIQUID CHILLER LOG SHEET LIQUID CHILLER LOG SHEET
ry Bulb / Wet Bulb
Compressor Discharge Temperature Discharge Temperature T T
Input Power Input Power
% Input FLA % Input FLA
Motor
% Motor FLA % Motor FLA
DC Bus Voltage DC Bus Voltage V V
Motor Housing Temperature Motor Housing Temperature T T
Magnetic
Rotor Elongation Rotor Elongation
Evaporator Pressure Evaporator Pressure
Refrigerant Corrsponding Temperature Corrsponding Temperature T T
Small Temperature Difference Small Temperature Difference T T
Supply Temperature Supply Temperature T T
Supply Pressure Supply Pressure
Liquid Return Temperature Return Temperature T T
Return Pressure Return Pressure
Flow Rate - GPM (If equipped) Flow Rate - GPM (If equipped)
Condenser Pressure Condenser Pressure
Corresponding Temperature Corresponding Temperature T T
Refrigerant Drop Leg Temperature Drop Leg Temperature T T
Small Temperature Difference Small Temperature Difference T T
Refrigerant Level Refrigerant Level
Supply Temperature Supply Temperature T T
Supply Pressure Supply Pressure
Liquid Return Temperature Return Temperature T T
Return Pressure Return Pressure
Flow Rate - GPM (If equipped) Flow Rate - GPM (If equipped)
VSD Command VSD Command
Capacity
VGD Command VGD Command
Control
HGBP Command (If equipped)
Remarks:
requesting Form 160.84-MR1.
An accurate record of readings serves as a valuable
reference for operating the system. Readings taken
when a system is newly installed will establish normal
conditions with which to compare later readings.
For example, an increase in condenser approach tem-
perature (condenser temperature minus leaving con-
denser water temperature) may be an indication of
dirty condenser tubes.

FAULT SHUTDOWNS

The chiller is programmed to shut down on two kinds
of fault conditions. A Cycling fault will allow the chill-
er to automatically restart when the condition clears.
A Safety fault requires the cause for the condition
be determined and resolved before restarting. Safety
faults require the Clear Faults key on the panel Home
screen be pressed to allow restart. When the condition
is cleared and that key pressed, the chiller will restart
unless the local stop key was pressed or the remote run
command ceased.
CENTRIFUGAL CENTRIFUGAL
Chiller Location Chiller Location
System No. System No.
/ / / / / / / / / / / /
FORM 160.84-OM1
ISSUE DATE: 9/21/2017
/ / / / /
160.84-MR1 (813)
New Release
Issue Date: August 30, 2013
LD16236a
JOHNSON CONTROLS