Wiring examples - S plan heating
S PLAN HEATING SOFTWARE SETTINGS
FIGURE 20. S PLAN SOFTWARE
SETTINGS
SOFTWARE SETTINGS EXPLAINED.
In this system we have one sensor for space heating and one for DHW. Relay 2 is
reserved for DHW. The example system does not have cooling capabilities so these
settings remain untouched.
The space heating valve (Valve 2) is connected to Relay 3, therefore, Relay 3 is
selected for “Zone 1 Kitchen”. Since the boiler is fired through the end switch on
Valve 2, Relay 1 is not selected for the heating zone. If selected, Relay 1 would fire
the boiler when the zone called for heat, before Valve 2 had time to open.
HOT WATER has been set to YES to make Relay 2 reserved for DHW control. RELAY
1 CALL is set to NO because we don’t want Relay 2 to fire the boiler when there is a
need for DHW, instead we want the boiler to fire when Valve 1 is fully open.
If your system doesn’t have a DHW sensor installed the SE1 can still control the
DHW, but without temperature control. From the app you will be able to turn DHW
generation ON/OFF, or you can set up an hourly schedule for DHW generation.
For this kind of system you will need a DHW Thermostat/High Limit Thermostat
connected between terminal T_L and T_SL. This is to make sure that the DHW
generation stops when the hot water reaches the desired temperature. This
thermostat is not only important to save energy and prevent scalding, but also to
prevent the water from boiling which can cause overpressure in the system.
OPTIONAL WIRING FOR S PLANS -
RELAY 2
FIGURE 21. ALTERNATIVE WIRING
FOR S PLAN HEATING
Valve 1 with N/O
end switch
DHW valve
to 6 (any of a to d)
to 7 (any of a to d)
DHW Thermostat
and/or
High Limit Thermostat
SE1 DEVICE SETT INGS
SETUP BOARD
REMOVE
EDIT
BLINK
HOT WATER
YES
NO
RELAY 1 CALL
YES
NO
ZONE 1 KITCHEN
RELAY 1R
ELAY 2
HOT WATER
RELAY3
RELAY 5
RELAY 4
RELAY 1R
ELAY 2
HOT WATER
RELAY3
RELAY 5
RELAY 4
HEATING
COOLING
