1Service (continued)
Maximum Cascade Outlet Set Point
This parameter determines the set point used by the individual water heaters in a Cascade. When a water heater is commanded to fire by the Leader water heater, it will attempt to achieve this temperature at its outlet. The Leader water heater will limit the modulation of the water heater in order to hold the temperature at the tank sensor to the user set point. If any of the water heater outlet temperatures reach the maximum cascade outlet set point, the water heater will then modulate down on its own in order to keep its outlet temperature within the maximum cascade outlet set point. Therefore, this parameter can be used to limit the outlet temperatures of all the water heaters in a Cascade. This parameter is adjustable by the installer by accessing parameter F7. The default maximum cascade set point is 185°F (85°C).
Minimum On/Off Time
In order to prevent units in a Cascade from short cycling, this parameter defines the minimum ON and OFF time for each unit. The installer can adjust this time by accessing parameter F8. The minimum setting is 0 seconds and the maximum setting is 10 minutes. The default is 30 seconds.
Minimum Next On Time
In order to reduce the risk of temperature overshoot with a Cascade, this parameter defines the minimum time delay from starting one unit until the next unit may be started. The installer can adjust this time delay by accessing parameter F9. The minimum setting is 0 minutes and the maximum setting is 10 minutes. The default is 60 seconds.
Boiler Size
Not used.
G: Circulation pumps
DHW Pump Delay
The DHW pump delay parameter sets the length of time the pump (if connected) will run after a DHW demand has been satisfied. This parameter is adjustable by the installer by accessing parameter G1. The time range for this parameter is 0 minutes to 40 minutes. The default time is 30 seconds.
DHW Pump Anti-Seize Delay
If the water heater pump does not run for 24 hours, it will be turned on briefly to prevent it from seizing. The length of time it runs is determined by parameter G2. The range of this setting is 0 seconds to 40 minutes. The default setting is 20 seconds.
Service Manual
H: BMS
BMS Type (Power / Set Point)
When programmed for BMS control through the 0 - 10V BMS input or through ModBus, the 0 - 10V signal can be interpreted as either a modulation command or a set point. When parameter H1 is set to POWER, the 0 - 10V signal will control the modulation. When set to SETPOINT, the 0 - 10V signal will control the tank set point. The default setting is
SETPOINT.
Volts at Minimum
When programmed for BMS control through the 0 - 10V BMS input or through ModBus, parameter H2 should be set to the minimum voltage signal sent to the SMART SYSTEM control. The range of this parameter is 0.0V to the Volts at Minimum value (parameter H3). The default setting is 2.0V.
Volts at Maximum
When programmed for BMS control through the 0 - 10V BMS input or through ModBus, parameter H3 should be set to the maximum voltage signal sent to the SMART SYSTEM control. The range of this parameter is the Minimum value (parameter H2) to 10.0V. The default value is 10.0V.
Rate at Minimum Volts
When programmed for BMS control through the 0 - 10V BMS input or through ModBus and the BMS Type is programmed as POWER, the modulation percentage represented by the Volts at Minimum parameter (H2) is set by parameter H4. The minimum value is 0% and the maximum is the Power at Maximum Volts setting H5. The default value is 20%.
Rate at Maximum Volts
When programmed for BMS control through the 0 - 10V BMS input or through ModBus and the BMS Type is programmed as POWER, the modulation percentage represented by the Volts at Maximum parameter (H3) is set by parameter H5. The minimum value is the Power at Minimum Volts setting H4 and the maximum is 100%. The default value is 100%.
Set Point at Minimum Volts
When programmed for BMS control through the 0 - 10V BMS input or through ModBus and the BMS Type is programmed as SETPOINT, the set point represented by the Volts at Minimum parameter (H2) is set by parameter H6. The minimum value is 32°F (0°C) and the maximum is the Set Point at Maximum Volts setting H7. The default value is 70°F (21°C).
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