© MHG Heating Ltd
18
MHG Heating Ltd Unit 4 Epsom Downs Metro Centre, Waterfield, Tadworth, Surrey KT20 5LR
Telephone 08456 448802 Fax 08456 448803 Email
Web www.mhgheating.co.uk
010711
6.0 Pressure (Safety) Relief Valve
In accordance with the prevailing British Standard 5440/6644, the installer shall install as suitably sized
Pressure (Safety) Relief Valve.
The location of this valve is important with respect to the applied pressure of the boiler circulation
pump, it is therefore recommended to locate the Pressure (Safety) Relief Valve on the flow pipe
immediately adjacent to the boiler; furthermore, there must not be any means of isolation between
the boiler and the Pressure (Safety) Relief Valve.
7.0 Electrical Connections
Basic electrical connection for all types of ProCon
Legend
Low Voltage Control terminals < 25 Volts
RU
1
QAA73 Room Unit Not Polarity Sensitive < 24Volts
(Link terminals to activate second heating zone control.)
2
RT
3
Heating Circuit 1 Volt Free Enable Not Polarity Sensitive (Room stat/BMS) < 24 Volts
4
AT
5
Outside Air Sensor (QAC34) Not Polarity Sensitive < 24Volts
(Required to Activate Direct on Boiler Weather Compensation)
6
BW
7
Hot Water Sensor (QAZ36) or Hot Water Volt Free Enable (Thermostat/BMS).
Not Polarity Sensitive < 24Volts
8
High Voltage Output and Input Terminals 230 Volts
E
9
Common Earth Terminal
BW/K3
10
Permanent 230 Volt Output for Motor Open Motor Close Hot Water Diverter Valve
11
Neutral Terminal for Hot Water Diverter Valve or Charging Pump
12
230 Volt Output For Hot Water Diverter Valve or Charging Pump (Max 1Amp)
K2
13
230 Volt Output For Heating Circuit Pump (ProCon 16-27)/Boiler Pump ProCon 47, 75&77)
(Max 1Amp)
14
Neutral Terminal for heating/Boiler Pump
E 15
Common
Earth
Terminal
K1
16
Neutral Terminal for heating/Boiler Pump
17 230 Volt Output For Boiler Pump (ProCon 16-27)/Heating Circuit Pump ProCon 47,75&77)
(Max 1Amp)
E
18
Permanent Earth Terminal
N
19
Switched Fused Permanent Neutral
L
20
Switched Fused Permanent 230 Volt Live (Max 5Amp)