MHG Heating 15 - System Type 3: Heating & DHW (Priority) with Mixing Header

Procon
. S T 
Typical single Procon , ,  &  boiler installation serving a heating and domestic hot water (priority)
with individual charging pumps, using a low velocity mixing header.
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 External Controller, either
QAA Room Unit, or Volt
Free Enable
OS Outside Air Sensor (QAC)
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
DOC Drain O Cock
Notes
* Only  t one type of Room
Temperature Control.
* Parameter Change may be
required.
