Technical data

Procon
. S T 
Typical multiple Procon , ,  &  boiler installation utilizing an RVA Cascade Manager serving a heating
and domestic hot water with individual charging pumps, using a low velocity mixing header. RVA Controller
& Housing (complete with  No QAD/ sensors), and OCI Communication Clip-In Modules ( per boiler)
required.
Please note;
• The Procon,  &  models include an internal pump and therefore an external boiler pump is
not required.
• The wiring of the internal pump on the Procon  MUST be relocated from K (Terminals  & )
to K (Terminals  & )
• The boiler pump on the Procon  must be wired to K (Terminals X-)
Essential Boiler Parameter Changes Applicable to System Type .
Line ID Description
Default
Setting
New Setting for
This System
H Summer/Winter Changer Over  
H Hydraulic System Con guration
 { & }
 { & }

H
Boiler Numbering In Cascade
{ = Boiler No,  = Boiler No,  = Boiler No,…  = Boiler
No}
  – 
Fig .a – Hydraulic Layout
Fig .b – Wiring Diagram for Models ,  & 
Fig .c – Wiring Diagram for Model 
Legend
C External Controller, (either
QAA, QAA, QAA)
Room Unit, or Volt Free En-
able.
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
NRV Non-Return Valve
RVA Cascade Manager
FS Flow Sensor (QAD/)
RS Return Sensor (QAD/)
