Figure 8: Liquid chiller log sheets
Note: A pad of 50 log sheets can be ordered from your local Johnson Controls branch by
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 temperature (condenser temperature minus
leaving condenser 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 chiller 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.
Prolonged shutdown
About this task:
If the chiller is to be shut down for an extended period of time (for example, over the winter
season), the following procedure should be followed.
1. Test all system joints for refrigerant leaks with a leak detector. If any leaks are found, they
should be repaired before allowing the system to stand for a long period of time. During long
idle periods, the tightness of the system should be checked periodically.
YMC
2
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