© MHG Heating Ltd
17
MHG Heating Ltd Unit 4 Epsom Dow ns Metro Centre, Waterfield, Tadw orth, Surrey KT20 5LR
Telephone 01737 358000 Fax 08456 448803 Email
Web w w w .mhgheating.co.uk
010717
6.4 Hydraulic Design Single Unit (Option 5)
Electrical Connections Cascade System (Option 5)
Master Boiler
High Voltage
Input/Output
Terminal Description/Label
Type
Mains power
Input
Brown=Live, Blue=Neutral, Yellow/Green=Earth
230Volts-50Hz
External Boiler Pump
Output
Q1 Boiler Circulation Pump max 0.5Amp
230Volts-50Hz
Heating Circuit1 Pump
Output
Q2 Central Heating Pump Max 0.5Amp
230Volts-50Hz
DHW Pump
Output
Q3DHW Storage Pump Max 0.5Amp
230Volts-50Hz
Low Voltage
Input/Output
Terminal Description/Label
Type
Cascade Communication
Output
Cascade Module. Screened Cable must be used
Coms
Outside Air Sensor
Input
Outside temperature Sensor. QAC34 sensor
provided
**Room Thermostat HC1
Input
Room thermostat, Volt free Enable
<24 Volts
**0-10Volt Enable HC1
Input
0-10Volt Enable H3
0-10Volts
Mixed Circuit Sensor
Input
Additional internal wiring required at
Commissioning QAD 36 sensor required
<24 Volts
DHW Demand
Input
Volt free thermostat or sensor
<24Volts
MHG Pressure Manager
Input
Multifunctional to be configured during
commissioning
<24 Volts
**Only one enable to be used per installation. Volt Free or 0-10.
Slave Boiler
High Voltage
Input/Output
Terminal Description/Label
Type
Mains power
Input
Brown=Live, Blue=Neutral, Yellow/Green=Earth
230Volts-50Hz
External Boiler Pump
Output
Q1 Boiler Circulation Pump max 0.5Amp
230Volts-50Hz
Low Voltage
Input/Output
Terminal Description/Label
Type
Cascade Communication
Input
Cascade Module. Screened Cable must be used
Coms