© MHG Heating Ltd
19
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
Enhanced electrical connection for ProCon HM (Units supplied with an integral Cascade manager)
Legend
High Voltage Output Terminals 230 Volts
BW
N
Neutral Terminal for Hot Water Charging Pump
E
Earth Terminal for Hot Water Charging Pump
L
230 Volt Output For Hot Water Charging Pump (Max 1Amp)
HK/ZB
N
Neutral Terminal for Heating Circuit Pump
E
Earth Terminal for heating Circuit Pump
L
230 Volt Output For Heating Circuit Pump (Max 1Amp)
Low Voltage Control terminals < 25 Volts
H1
M
H1 Ground Terminal
H1
Controller Operating Input (Volt free Enable/0-10 Volt Control/Mode Alteration)
RL
M
System Return Sensor (QAD 36) Terminal Not Polarity Sensitive < 25 Volts
B70/B4
VL
M
System Flow Sensor (QAD 36) Terminal Not Polarity Sensitive < 25 Volts
B10
BW
M
Hot Water Sensor (QAZ36) or Hot Water Volt Free Enable (Thermostat/BMS).
Not Polarity Sensitive < 24Volts
B3
AF
M
Outside Air Sensor (QAC34) or
(3000
Ω
Substitute Resistor = -1
0
C)
Not Polarity Sensitive < 24Volts
(Required to Activate Direct On Boiler Weather Compensation)
B9
RU
MD
Cascade Controller Output to Slave Boilers. Polarity Sensitive (Screened Cable Required)
(X41 Terminal 2 (Right) OCI420 Communication Clip)
A6
Cascade Controller Output to Slave Boilers. Polarity Sensitive (Screened Cable Required)
(X41 Terminal 1 (Left) OCI420 Communication Clip)
Please note that two outside air sensors are available. Please ensure that the units are wired as follows.
QAC34
Wired to the either AT terminals.
In either case the outside air temperature will be communicated to all controllers.
