Technical data

18
GEMINI HSC
15.0 water
connections
primary water connections
Primary flow and return connections should be made to the calorifier using appropriate sized fittings
with a male BSP component that allows for disconnection of the unit. Care must be taken to ensure that
connections are watertight to avoid unseen leakage and external corrosion damage to the exterior tank and
to avoid water entry into electrical components.
secondary water connections
All of the secondary connections are located on the top of the unit and are male BSP threaded stainless
steel.* Connections should be made via fittings that do not allow galvanic corrosion between the calorifier
and the system pipework.
Connections to the unit must allow for complete disconnection and removal of local pipework in order
that the removal of the inspection access port cover is not impeded.
* Models 200-i, 300-i and 500-i when being installed on a vented system are supplied with 2no.
1
1
/
2
" x 1” BSP FF reducing sockets which then creates 1
1
/
2
" BSP female cold feed and hot draw
off connections.
It is important to ensure that all pipework is flushed to avoid the damage that foreign particles could
do to control valves, this is particularly important where the installation is unvented.
1. Ensure the calorifier is correctly connected to the primary and secondary circuits.
2. The secondary (domestic) inner tank must be filled first.
3. Open all outlet taps.
4. Turn on water supply and allow the calorifier to fill.
5. Close taps in turn after having purged the system of air.
6. Check for water leaks around the appliance and in particular around any valves or controls.
Check again when the appliance is hot.
7. Check that no water is passing to waste through any relief valves.
8. Test the operation of any temperature and pressure relief and expansion valves by lifting/turning
the manually operated test lever/cap and observing that water flows freely and safely to waste.
9. Check that the discharge pipe is installed so that it falls continuously and that no taps, valves or
other shut off devices are installed in the pipe.
16.0 filling the water heater/
commissioning the water system