Setting The Automatic By-Pass Valve - Heatrae Sadia ELECTROMAX Installation & Servicing Instructions Manual

Hot Water
"BOOST" On
Indictator
Hot Water
"ON" Switch
Diagram 19 Fascia Panel Features - Radiator Model Graphics Shown
modulates the power.
(g) Check the primary FLOW pipework
from the Electromax begins to rise in
temperature.
(h) When the boiler is operating at its
maximum power output ("HEAT" indicator
fully illuminated) set the pump speed to
give a 5° to 10° C differential between the
primary flow and return connections at the
boiler.
(i) Set the programmable room thermostat
to be satisfied (not calling for heat). The
"HEAT" and
should no longer be illuminated, however
the pump may continue to run for a short
period (pump over-run facility) to dissipate
the heat from the boiler heat exchanger if
required.
(j) When the system is hot bleed all radiators
and air vents to remove any residual air
from the system.
26 Installation & Servicing Instructions
Boiler Status
Display
Hot Water
Primary Flow
"BOOST"
Temperature
Switch
Adjustment
"DEMAND" indicators
Primary System
Pressure Gauge
Central / Underfloor Heating
"ON" Switch

7.7 Setting the Automatic By-pass Valve

(a) Loosen the brass locking screw on top of
the adjustment cap of the by-pass valve
(see diagram 42, page 39).
(b) Turn the adjustment knob fully clockwise
so that the number 5 coincides with the
indicator arrow on the body of the valve.
(c) 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.
(d) Turn the adjustment knob clockwise by
half a turn. Lock in position by tightening
the brass locking screw.