Prestige ACVMax Control Supplement

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7.0 Cascade
7.5.1 Navigation:
Home Screen>Installer Menu>Cascade>Cascade Settings
The Cascade Settings menu contains settings related to cascade operation.
Each line contains a Cascade Setting followed by its current value. Six
Cascade Settings are displayed on the screen at one time. Press the UP
or DOWN buttons to scroll through additional Cascade Settings.
Cascade Setting changes must be made only on the Cascade Master.
Cascade Autodetection must be performed after making any
changes to a Cascade Setting before the change will take effect.
7.5.2 Stage Delay Default: 60 Seconds
Stage Delay sets the time delay before enabling or disabling a boiler in the
Cascade System. The Stage Delay begins once the Master boiler determines that
a boiler must be enabled to reach the setpoint or when the Master boiler deter-
mines a boiler should be disabled because of a decreasing load. Press the LEFT
or RIGHT buttons to adjust the Stage Delay then press the OK button to store
the setting. Adjusting the Stage Delay will have the following effects:
• Increase Stage Delay
- Reaching the setpoint could take longer due to a longer delay
between enabling boilers.
- Overshooting the setpoint could occur due to boilers staying on
longer before being disabled.
• Decrease Stage Delay
- Overshooting the setpoint could occur due to boilers being
enabled quicker.
- Boilers will be disabled quicker, possibly increasing boiler
cycling and decreasing runtimes.
7.5.3 Minimum Firing Rate Default: 25%
Minimum Firing Rate is the minimum firing rate of a single boiler in the Cascade
System. The Master boiler uses this setting to determine when boilers can be
enabled and disabled. Setting the Minimum Firing Rate below the recommend-
ed minimum will result in boilers being enabled too quickly which may cause
sharp increases in temperature from the Cascade System. Setting the Minimum
Firing Rate above the recommended minimum will delay the enabling of boilers
which may lower the system efficiency. Press the LEFT or RIGHT buttons to
adjust the Minimum Firing Rate then press the OK button to store the setting. For
the minimum and maximum recommended settings refer to Table 6 on page 52.
NOTICE
7.5 Cascade Settings
Cascade Setting
Stage Delay
Minimum Firing Rate
Max. Firing Rate
CH/DHW Boilers
Auto Rotation
CH Prop. Gain
60 sec
25%
398 MBH
0
Enabled
7
0%
100%
25%
Minimum Firing Rate
0sec.
255sec.
60Sec.
Stage Delay