Menu Item Description
RTHC-SVD01B-EN 9
• Soft Load Control (Enable/Disable)
• Soft Load Starting Current Limit (40-100%)
• Soft Load Current Limit Rate of Change (0.5 to 5%/min.)
• Soft Load Leaving Water Temperature Rate of Change (0.5 to 5 F/
min.)
Factory Defaults:
• Soft Load Control (Enable/Disable) = Disable
• Soft Load Starting Current Limit (40-100%) =100%
• Soft Load Current Limit Rate of Change (0.5 to 5%/min.) =5%
• Soft Load Leaving Water Temperature Rate of Change (0.5 to 5 F/
min.) =5
For example, if soft load control is enabled.
Soft load starting current limit is set for 40%.
Soft load current limit rate of change is set for 5%/min.
Soft load leaving water temperature rate of change is set for 5 F/min.
The chiller will start and load normally (i.e.: as fast as needed) until the
soft load starting current limit (40%) is reached. At this point, UCP2 will
monitor both the current draw and the leaving water temperature
ensuring that neither exceed the rate of change set in the menu (5%/
min. and 5 F/min. respectively in this example).
2-4. External Base Loading
Base loading is a control feature used to load the chiller at a constant
rate, in an open loop fashion. This feature, working in conjunction with
the chiller's limit controls, can force the chiller to a specified operating
point by appropriately setting limit set points. The unit can then be held
at this operating condition indefinitely, as long as sufficient load exists.
Such a feature is typically used to force one or more chillers on a mul-
tiple chiller water loop to operate at a specified condition. The base
loading control feature can only be enabled or disabled by a higher
level building management system. There is no front panel means to
start base loading control. Differential to start and stop are still
enforced.
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