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Raising or
Lowering the System Setpoint
• For W model heaters:
a) If ADJUST > System Settings > System > Modbus Mode parameter = OFF or Monitor, use this
procedure to raise or lower the system setpoint.
b) If ADJUST > System Settings > System > Modbus Mode = Temp or Rate, the system setpoint
can only be changed via the EMS or BMS system.
• For H model heaters:
a) If ADJUST > Operation Settings > Target Mode parameter = SETP, use this procedure to raise
or lower the system setpoint.
Note: For H model heaters set to operation mode 3 in a DHW only application >71
setpoint is changed via the Pump C Controller aquastat – refer to instructions supplied with the
Pump C Controller.
b) If ADJUST > Operation Settings > Target Mode = EMS or MODB, the system setpoint can only
be changed via the EMS or BMS system.
c) If ADJUST > Operation Settings > Target Mode parameter = RSET, the VERSA control board
varies the system setpoint temperature based on the outdoor air temperature as detected by
the optional outdoor air sensor S4.
To change the system setpoint if Modbus Mode parameter = OFF or Monitor (W model heaters), or if
Target Mode parameter = SETP (H model heaters without an aquastat):
1.
Turn heater OFF and isolate power supply to heater by switching off electrical isolator
located adjacent to heater.
2.
Remove front upper panel then remove six hex head screws retaining touchscreen surround panel
and remove panel.
3.
Switch VERSA DIP switch 1 to the ON (up) position.
4.
Restore power supply and turn heater ON.
5.
Reboot touchscreen TOOLS > Screen Reboot > Screen Reboot.
6.
Tap the MENU button to enter the home screen.
7.
Tap the ADJUST button to enter the adjust menu.
8.
Tap the System Settings button to enter the system settings menu.
9.
Tap the System button to enter the system screen.
10. Tap the Target Setpoint (Tank Setpoint for W models) up ▲ or down ▼ buttons to adjust the
setpoint value to the desired temperature. The value will change and the green bar above the value
will change to red.
11. Tap the Target Setpoint SET button. The red bar above the value will change to green at which
time the new value is accepted.
12. Turn heater OFF and isolate power supply to heater by switching off electrical isolator
located adjacent to heater.
13. Switch VERSA DIP switch 1 to the OFF (down) position.
14. Reassemble in reverse order of steps 2 ~ 1.
15. Reboot touchscreen TOOLS > Screen Reboot > Screen Reboot.
83
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