Technical data

19
GEMINI HSC
Periodic checks must include:
a) Check and clean the line strainer.
b) Check pressure in expansion vessel and top up as necessary. Must be set 3.5 bar. Check should be
carried out with expansion vessel drained of water to avoid that you cross-read system water pressure.
c) Check manually by lifting the test lever on the temperature and pressure relief valve.
d) Check manually by turning the test knob on the expansion relief valve.
e) Check discharge pipes from both relief valves to ensure no obstructions.
10. Fill the primary side (outer tank) and ensure correct and proper venting via the primary air (manual) air
vent located adjacent to the primary flow in connection.
Note: failure to properly vent the primary side of the calorifier will result in
circulation noise and poor performance of the unit.
IMPORTANT OBSERVATIONS
Failure to observe the correct sequence of filling (ie. domestic first) may lead to irrepairable damage
to the calorifier.
11. Demonstrate operation to the user including the purpose and operation of any temperature and
pressure relief valve or expansion valve and what to do if these valves should self operate.
12. Hand over this manual to the user for future reference and advise that periodic checks of the
equipment are essential for safety. Advise that any expansion vessel in an unvented application may
need to be recharged periodically by the installer.
17.0 unvented
system controls
16.0 filling the water heater etc. (contd)