Installation & Operation Manual
11 Operating information (continued)
Cascade | Access modes |
When multiple water heaters are installed, they can be wired together in a cascade sequence. A maximum of eight water heaters can be controlled from a single control. In this application one water heater would be designated as the Leader control and all others would be designated as Member controls. If installing the water heaters in an existing system, the new water heater should be programmed as the Leader and/or the higher number addresses. The Leader control can be programmed to use Lead/Lag or Efficiency Optimization control methods.
Once the Leader water heater receives a call for heat from a tank sensor, BMS or Modbus, the control will determine what the set point will be. A fixed temperature set point can be programmed into the control. See page 57 of this manual to program the set point.
If the water temperature at the tank is less than the set point - differential, then the control will initiate a call for heat on the Cascade (see the Armor Water Heater Service Manual for an explanation of the differential). The Leader will energize the lead water heater on the Cascade. For a new startup this will be the Leader water heater.
Sequence of the cascade
To equalize the runtime of all water heaters on the Cascade, the firing sequence will automatically be changed at set intervals.
For the first 24 hours after initializing the Cascade, the sequence will be changed every hour. After that the sequence will be changed once every 24 hours. The switching on/off sequence will be as follows:
User
The user can adjust tank target temperatures by pressing the NAVIGATION dial when “SETPOINTS” is flashing at the bottom of the display. The date and time, and the temperature units can also be changed (see page 58).
Installer
Most parameters are available only to the installer, accessible by entering the installer password, see the Armor Water Heater Service Manual.
Saving parameters (reference the Parameter Table in the Armor Water Heater Service Manual)
NOTICE | Please note that the brackets ([]) denote |
| screen status. |
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To save parameters and exit programming:
Press the RIGHT SELECT [SAVE] key and then press the RIGHT SELECT [HOME] key.
To enter a parameter and continue programming:
Press the RIGHT SELECT [SAVE] key 1 time to return to the parameter listings; press again to return to the menu listings. Remember to press the RIGHT SELECT [HOME] key when finished programming in order to save the changes made.
See the Armor Water Heater Service Manual for a detailed description of parameters and access modes.
DAY | SWITCHING ON SEQUENCE |
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Day 1 | |
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Day 1 + 1 hour | |
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Day 1 + 2 hour | |
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Night Setback operation with cascade
Night Setback operation of the water heaters within the Cascade is available. Programming of the Night Setback will be done through the Leader water heater. Refer to the Armor Water Heater Service manual for information regarding Night Setback.
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