Bosch Worcester Greenstar HIU E Installation And Maintenance Instructions Manual page 11

Control unit connections
Component connections
Connections/
Symbol Function
Circulation pump
• Live output [Brown]
63 N • Neutral output [Blue]
• Earth output [Green/Yellow]
Flow turbine connection
• Red [4]
4 3 2 1 • -
• Yellow [2]
• Black [1]
Flow sensor NTC (district heating)
• White [2]
2 1 • White [1]
Domestic Hot Water sensor NTC
• Blue [2]
2 1 • Blue [1]
Central heating control valve
• Brown [4]
4 3 2 1 • Black [3]
• White [2]
• Yellow [1]
Domestic Hot Water control valve
• Blue [4]
4 3 2 1
• Green [3]
• Grey [2]
• Red [1]
Flow sensor NTC (central heating)
• Yellow [2]
2 1 • Yellow [1]
Return sensor NTC (district heating)
• Green [2]
2 1
• Green [1]
Not used
2 1
Control panel fuse
Table 3
6 720 808 928 (2017/06)
Installer connections
Connections/
Symbol Function
Limiter thermostat (under-floor safety cut-off)
• Potential free
LR L
230 V feed to external controls modules
230V
• Live output [L]
OUT
L N • Neutral output [N]
• Earth output [
230 V supply to the appliance
230V
• Live input [L]
IN
L N • Neutral input [N]
• Earth input [
Not used
BUS
2 1
Sense II connection
EMS
• Not polarity sensitive
2 1
Outdoor temperature sensor
• Not polarity sensitive
2 1
Not used
PW2
14 N
230 V feed to external time and temperature
control
120/230 VAC
• Switch live demand input [LR]
LR L N
• Live output [L]
• Neutral output [N]
• Earth output [
Not used
PW1
14 N
Not used
2 1
Table 4
Appliance information
]
]
]
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