Thermostatic Mixing Valve; Servicing - GAH Electrastream User And Installation Instructions Manual

Note
For more information see 4-5.
2 2 2 2 2
2-5

Thermostatic Mixing Valve

Fig. 2-5a Thermostatic Mixing Valve
2-6

Servicing

14
it is caused by the heating system or hot water system and do the following:-
1. Turn ON a hot tap to relieve the pressure.
2. Turn OFF the immersion heater.
3. Turn OFF the heating system.
4. Investigate possible cause for high pressure from the hot water system e.g:-
i Cylinder Thermostat is set too high.
ii Restriction in hot water pipework.
iii Loss of air pressure in the accumulator resulting in no expansion
(Electrastream Plus only)
If the heating heating system is the cause then :-
5. Check that the radiators are turned on, the heating system should never be operated
with all radiators OFF.
If all radiators are fitted with thermostatic valves, these can all be in a shut condition
if the temperature in the dwelling is sufficient. In this circumstance the heating
system should have a bypass that should be open - see fig. 1-2a & 1-2b.
6. Investigate possible cause for high pressure e.g. air in the heating system.
7. Contact the installer before restarting the system.
The Mixing Valve will be fitted in the supply to the hot taps/outlets, it may be in a different
location than the cylinder. This valve mixes hot water from the cylinder with cold water to
provide hot water of a constant temperature at the taps.
The recommended maximum hot water temperature at the taps is 60ºC.
The recommended setting of the valve is between No.4 and 6 (49º to 58ºC).
The Mixing Valve is factory set to the following approximate mixed outlet temperatures:-
Knob Position Min
Output Temp. ºC 27º
WARNING
Do not set the water temperature too high as this can cause scalding
especially to the young and old.
It is recommended the system is inspected by an approved engineer once per year.
The service procedure is included in section 6.
OPERA OPERA OPERA OPERA OPERATOR CONTROLS TOR CONTROLS TOR CONTROLS TOR CONTROLS TOR CONTROLS
1 2 3 4
32º 38º 44º 49º
2 2 2 2 2
5 6 7 Max
53º 58º 63º 67º