Unmixed Central Heating With Under-Floor - Bosch Worcester Greenstar HIU E Installation And Maintenance Instructions Manual

4.7.2

Unmixed central heating with under-floor

Fig. 16
Option 1: Control of under-floor with Sense II (EMS controller)
example
Fig. 17
Connections/
Symbol Function
Limiter thermostat (under-floor safety cut-off)
• Potential free
LR L
Sense II connection
EMS • EMS2 Room control
2 1 – Not polarity sensitive
Outdoor temperature sensor
• Not polarity sensitive
2 1
6 720 808 928 (2017/06)
T
Option 2: Control of under-floor with 230V programmable room
thermostat example
Fig. 18
Connections/
Symbol Function
Limiter thermostat (under-floor safety cut-off)
• Potential free
LR L
230 V feed to external time and temperature
control
120/230 VAC
• 230V programmable room thermostat
LR L N
– Switch live demand input [LR]
– Live output [L]
– Neutral output [N]
– Earth output [
Pre-installation requirements
120/230 VAC
LR L N
]
21