Electrical Schematic - Bosch Worcester Greenstar HIU E Installation And Maintenance Instructions Manual

Appliance information
2.9

Electrical schematic

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Fig. 6 Electrical schematic
[1] Control unit
[2] Low voltage connections (rear in service position)
[3] 230V connections (rear in service position)
[4] Low voltage connections (front in service position)
[5] 230V connections (front in service position)
[6] Sense II connection
[7] Outdoor weather sensor
[8] 230V external control system
[9] Limiter connection (pre-wired link) remove link to connect limit
thermostat (for under-floor heating circuit protection)
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7 8
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PW1 120/230 VAC PW2
LR L N
14 N 14 N
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[10] Mains 230V supply
[11] Circulating pump
[12] Flow sensor NTC (central heating)
[13] Return sensor NTC (district heating)
[14] Central heating control valve
[15] Domestic Hot Water control valve
[16] Supply sensor NTC (district heating)
[17] Domestic Hot Water outlet sensor NTC
[18] Flow turbine
[M] Provision for heat meter M-Bus connection
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6 720 808 928 (2017/06)