Technical data

Procon
. S T .
Typical single Procon , ,  &  boiler installation utilizing an RVA Controller serving two heating zones
each with a mixing valve, and domestic hot water (priority) with individual charging pumps, using a low veloc-
ity mixing header. RVA Controller & Housing,  No QAD/  ow sensors, and an OCI Communication
Clip-In Module required.
Please note;
• The Procon,  &  models include an internal pump and therefore an external boiler pumpis
not required.
• The boiler pump on the Procon  must be wired to K (Terminals X-)
Fig .a – Hydraulic Layout
Fig .b – Wiring Diagram for Models ,  & 
Legend
C Heating Zone  Temp Con-
troller (either QAA, QAA
or QAA) or Volt Free En-
able
C Heating Zone  Temp Control-
ler (either QAA, QAA or
QAA) or Volt Free Enable
OS Outside Air Sensor (QAC)
or 
Ω Resistor {Fitted to
RVA}
SV Safety Valve.
IV Isolation Valve
LSV Lockable Service Valve
S/T Hot Water Sensor (QAZ), or
Volt Free Enable
CWM Cold Water Main
DOC Drain O Cock
ZFS Zone Flow Sensor (QAD/)
