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Primary Pipework
Pressure relief valve
Fill & Flush Valve
Piping insulation
Filter-Ball/ Y-Strainer
This section is applicable to both the Modul-AIR All-E and
Aqua variants.
The flow and return connections on the underside of the unit
are 15mm compression.
The Modul-AIR unit can be piped to in both rigid and flexible
pipe. Nuts and olives are supplied with the heat pump.
It is advised to increase the size of the primary pipes to 22mm
copper or 25mm Alu-plex to reduce the resistance.
Isolation valves must be installed directly below the unit to
allow for maintenance and/or repair of the Heat Pump.
Piping the Modul-AIR
The piping system must be flushed out before the Heat Pump is connected
so that any debris will not cause damage to the component parts
The Heat Pump does not have a pressure relief valve incorporated. The installer MUST ensure the system
is protected from over-pressurisation. The valve prevents abnormal water pressure from damaging the
system by opening at a maximum pressure setting of 3.0 bar.
The fill & flush valve must be installed on the primary return aer all system connections have been made.
This ensures that when purging air from the system, the entire system is being purged correctly.
Pipe insulation should comply with BS 5422:2009. Alternatively, insulation of a thickness that provides
reduction of heat loss equivalent to material having a thermal conductivity of 0.035 W/mK at 40°C and
thickness equal to the diameter of the pipe (or 40mm, whichever is smaller) may be used.
Installation of the filter/ strainer is essential to protect the Heat Pump from system debris.
The filter/ strainer must be cleaned aer one day of operation and it must be checked periodically to
maintain the minimum system flow rate.
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