3
Application notes
Please follow these pre-installation instructions carefully. Failure to install your CombiBoost
in accordance with these instructions will invalidate your warranty.
1. Location of CombiBoost
The best possible location of the CombiBoost is on the cold water mains supply to the house,
by the mains stop tap or the combi boiler inlet, depending on the installation.
1.1 Cooling and ventilation
The CombiBoost should be placed in a position where there is adequate air flow to cool the
motor and separated from any other appliances that generate heat.
1.2 Frost protection
CombiBoost must be protected from frost damage.
2. Cold supply to the CombiBoost
CombiBoost must be fitted directly to the cold water mains house supply, or the mains
water inlet to the combi boiler as indicated in the pre-installation checklist. Never fit to
communal risers (e.g. block of flats), restrictive or collapsed supply pipework (eg lead main)
or secondary circuits that are pumped.
3. General plumbing
Please note that the CombiBoost is designed to boost incoming water flow under low
pressure conditions. It cannot overcome restricted incoming pipework and replacement
water pipes should be installed in this scenario.
Installation must comply with the relevant requirements or local byelaws.
It is recommended that CombiBoost is installed vertically, and every effort should be made
to accommodate this. However, CombiBoost will function correctly if installed horizontally. It
must be adequately vented, protected from frost, and with access provided for servicing.
Jointing compounds, Boss White, hemp and steel wool MUST NOT BE USED. SOLDER
FLUXES MUST NOT COME INTO CONTACT WITH THE PUMP. THIS WILL INVALIDATE YOUR
WARRANTY.
Supplied inlet strainer must be fitted to the inlet supply of the CombiBoost. All outlets which
are located between the mains stop tap and the CombiBoost must be protected by non-return
valves. This is to prevent backflow of water and air from these outlets to the CombiBoost,
which will cause damage to the pump.
Suitable for maximum inlet pressure of 1MPa (10 bar).
In line with good plumbing practice and Water Regulations, ensure that a non-return valve
has been fitted directly after the mains stop tap to the house. Earth continuity must be
maintained with 4mm
2
earth connection cable.