andrews R18 Series, Technical Documentation Manual

Page: 51 / 71

18IP22B
43
Fig. 29 Electronic temperature regulator Rwf40
7.4 Fault indications If there is insufficient water flow the water heater will turn off
RWF40
A Process value (actual temperature)
B Set point (temperature)
C Burner enable (not applicable)
D Mod. indicator (decrease fire rate)
E Mod. indicator (increase fire rate)
F Two-stage firing (not applicable)
G Limit comparator
H Manual operation
The keys K-L-M-N are used for displaying
values and changing parameters in the
temperature controllers configuration.
K Down key (reduce value)
L Up key (increase value)
M Programme key
N Exit key
and lock-out. Red lamps 2 and 5 on. Reset by pushing button
3.
If the flow temperature exceeds the high limit setting, the boiler
will mechanically lock out and red lamp 2 illuminates. Reset by
pushing button 3 and allow the unit to fire. If lamp 4 TA then
illuminates, reset button in high limit thermostat. Remove the
high limit thermostat cap nut placed at the right hand side of the
cover (see sticker high limit thermostat) with a 17 mm ring-
spanner. Press a screwdriver against the green peg until a light
click is heard. Lamp 4 turns off. Refit cap nut. Then press
button 3 to reset red lamp 2 (CA).
If an ionisation failure occurs, red lamp 2 will light, burner will
switch off. Reset by pushing reset button 3.
The pilot flame on the main burner can be observed through
the sight glass on the lower left hand side of the water heater.