Heatrae Sadia ELECTROMAX SOLAR Installation & Servicing Instructions Manual page 38

4. After 2-3 minutes the demand indicator will remain illuminated and the heat indicator will
illuminate. The height of the heat indicator will vary as the boiler heat input modulates the
power.
5. Check the central heating flow pipework from the Electromax Solar begins to rise in tem-
perature.
6. When the boiler is operating at its maximum power output the heat indicator should be
fully illuminated. Set the pump speed to give a 5 - 10ºC differential between the central
heating flow and return connections at the boiler. The pump speed can be set between 1
and 3 ( 1 = 1700 rpm, 2 = 2100 rpm and 3 = 2300 rpm ). The switch to adjust the pump
speed is located on the top of the pump housing. You will need to lift the central heating
expansion vessel to gain access to the switch.
7. Set the programmable room thermostat to be satisfied (refer to the programmable room
thermostat instructions). The heat and demand indicators should switch off. The pump
may continue to run for a short period to dissipate the heat from the electric boiler.
8. When the system is hot, bleed all the radiators and air vents to remove any residual air
from the system.
4.6 COMMISSIONING - AUTOMATIC BY-PASS VALVE
1. Switch off all radiators with TRV's
2. Loosen the brass locking screw on top of the adjustment cap of the by-pass valve
3. Turn the adjustment knob fully clockwise so that the number 5 coincides with the
indicator arrow on the body of the valve.
4. With the boiler on (demand and heat indicators illuminated) and the pump running, slowly
turn the adjustment knob anti-clockwise until hot water can be felt on the outlet side of the
by-pass valve.
5. Turn the adjustment knob clockwise by half a turn. Lock in position by tightening the
brass locking screw.
FIGURE 23: AUTOMATIC BYPASS VALVE
ADJUSTMENT KNOB
38
BRASS LOCKING SCREW