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Ice Making (Auto to Ice Making to Ice
Making Complete)
The following figure shows the transition from auto to
ice making, to ice making complete.
Figure 43. Sequence of events: ice making (auto to ice making to ice making complete)
Command Ice Making Via
1. Front Panel OD (On)
2. Tracer (On)
3. External Input (Close/Short)
Auto
Auto
(Waiting to
(Starting
Start)
Compressor)
Head Relief Request Relay
Delay (1 to 60 Minutes)
HDWA-SVX001D-EN
Evaporator Entering Water
Temperature Falls Below the
Ice Termination Setpoint
Running
(Ice Building)
Load Chiller at
Max Rate
Ignore Softloading and
Set Demand Limit=100%
Energize Ice
Building Relay
Energize Head Relief
Request Relay
Evaporator Entering Water Temperature Rises
Above the Ice Termination Setpoint
Preparing Shutdown
(Ice Building Complete)
MBC Levitation Will Stop When
RPM < 1200 For 60 Secconds
De-Energize
Compressor
De-Energize Ice
Building Relay
Head Relief Request Relay
Delay (1 to 60 Minutes)
No Evaporator Pump
S S t t a a r r t t - - u u p p a a n n d d S S h h u u t t - - d d o o w w n n
Remove All Ice Making Commands Via
1. Front Panel OD (Auto)
2. Tracer (Auto)
3. External Input (Open)
Shutting Down
(Ice Building
(Ice Building Complete)
Close IGV
De-Energize Condenser
Water Pump Relay
Close Motor Cooling
Valve
Close Drive Cooling
Valve
De-Energize Head
Relief Request Relay
De-Energize Evap
Water Pump Relay
Off Delay for
Ice Building
Close Economizer Valve
Stopped
Stopped
to
Complete)
Starting
De-Levitate
Magnetic Bearings
Close MBC
EXV
59
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