Technical data

© MHG Heating Ltd
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MHG Heating Ltd Unit 4 Epsom Downs Metro Centre, Waterfield, Tadworth, Surrey KT20 5LR
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Web www.mhgheating.co.uk
010109
RVA47 Cascade Manager Wiring Terminals.(Housing)(Housing designed for use with additional RVA46 Zone controller)
Terminal Designation
Tag Voltage Description/Operation/Function
DB <25V
Boiler Communication
(LPB Data connected in parallel to boiler mounted OCI420 Clips))
MB <25V
Boiler Communication
(LPB Ground connected in parallel to boiler mounted OCI420 Clips)
A6 <25V QAA70/50/10 Room Unit (PPS Data)
MD <25V QAA70/50/10 Room Unit (PPS Ground)
B9 <25V
Outside Air Sensor
(QAC31/32) or (620Ω Substitute Resistor = -1
0
C)
(Mounted on North Facing Wall)
M <25V Ground Connection for all Sensors/Inputs
B10 <25V
System Flow Sensor (QAD21)
(To be positioned on system side of system Low Loss Header)
B3 <25V
Hot Water Sensor (QAZ21)/Volt Free Enable via Calorifier Thermostat/BMS
(Parameter alteration required if Volt Free Enable Used)
B70/
B4
<25V
System Return Sensor (QAD21)
(To be positioned on boiler side of system Low Loss Header)
H1 <25V 0-10 Volt Input via BMS/Volt Free Enable via Room Thermostat/BMS
Q1 230V Heating Pump Output (Max 2 Amp)
Q3 230V Hot Water Charging Pump/3 Way Valve Output (Max 2 Amp)
N 230V Permanent Neutral
PE - Permanent Earth
L 230V Permanent Live (Max 6 Amp)
(All ‘M’ Terminals are Internally Linked)