© MHG Heating Ltd
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MHG Heating Ltd Unit 4 Epsom Downs Metro Centre, Waterfield, Tadworth, Surrey KT20 5LR
Telephone 08456 448802 Fax 08456 448803 Email info@mhgheating.co.uk Web www.mhgheating.co.uk
020315 Draft
Wiring Diagram Legend
Module 1 Main Power Switch
Combustion Fan Control Voltage
Module 2 Main Power Switch
Module 3 Main Power Switch
Module 4 Main Power Switch
Control & Limit Thermostats
Module to Module Internal Communication
Module Fan Damper Switch (Upper)
Module Fan Damper Switch (Lower)
Pump Differential Switch (Upper Module Only)
HWS Sensor / Volt Free Enable
Module Rectification Electrode (Upper)
Module Rectification Electrode (Lower)
HWS Charging Pump (Supplied By Others)
Module Ignition Transformer (Upper)
Mixing Zone 1 Pump (Supplied By Others)
Module Ignition Transformer (Lower)
Mixing Zone 2 Pump (Supplied By Others)
Module Flue Thermal Fuse (Upper)
Main Heating Circuit Pump (Supplied By Others)
Module Flue Thermal Fuse (Lower)
Module Flow Sensor (Upper)
Module Flow Sensor (Lower)
Module Return Sensor (Upper)
Module Return Sensor (Lower)
Module Flue Gas Thermostat
Module Control Thermostat (Upper)
Module Control Thermostat (Lower)
Mixing Zone 1 Valve (Supplied By Others)
Mixing Zone 2 Valve (Supplied By Others)
HWS, Common Flow Sensors Plug
Control Panel Light (Optional Extra)
Power Supply (2 Pin, 1 Amp Max)
Lockout Auxiliary Relay (System Limit Controls)
Lockout Auxiliary Relay (System Temperature Control)
E-Bus Cascade Communication Plugs
Main Heating Circuit Pump Plug
Module Pump Differential Pressure Switch
Module Combustion Fan Motor (Upper)
Module Combustion Fan Motor (Low)
System Water Low Pressure Switch
RS485 Cascade Communication Plug
System Water High Pressure Switch
Condensate Level Limit Pressure Switch
Cascade Communication Terminals
Anti-Sludge Sensor (Optional Extra)
Theta Controller Main Power Switch
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