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

Diagram 19 Fascia Panel Features - Radiator Model Graphics Shown
Hot Water
"BOOST" On
Indictator
Hot Water
"ON" Switch
d. S e t t h e P r o g r a m m a b l e R o o m
Thermostat to be calling for heat (the
set programme may need to be
over-ridden to do this, refer to
the instructions supplied with the
Programmable Room Thermostat to
do this).
e. The boiler "DEMAND" indicator will
flash green and the pump should
run.
f. A f t er approx. 2-3 minutes th e
"DEMAND" indicator will remain
illuminated green (no longer flashing)
and the "HEAT" indicator will illuminate.
The height of the "HEAT" indicator will
vary as the boiler heat input 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
between the primary flow and return
connections at the boiler.
i. S e t t h e P r o g r a m m a b l e R o o m
Thermostat to be satisfied (not
calling for heat). The "HEAT" and
Boiler Status
Display
Hot Water
Primary Flow
"BOOST"
Temperature
Switch
Adjustment
to 10 C differential
o o
Primary System
Pressure Gauge
Central / Underfloor Heating
"ON" Switch
"DEMAND" indicators 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.

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).
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.
Installation & Servicing Instructions 25