QUICK REFERENCE
6.2
NORMAL OPERATION
The Q37 and Q37P boilers feature a user display which shows actual flow temperature at
all times. However, the display can also be used to show other information about the
operation of the boiler. By pressing the “Installer” button once the display changes to show
the number 1. Each time the “Installer” button is pressed the number increases up to a
maximum of 7. Having select the required number in this way the display, if not touched
for a further 5 seconds the display changes again to show the value relative to that
number. The table below shows the values associated with each number
INSTALLER INFORMATION NUMBERS
N.A.
8
Actual flue temperature (of the flue temperature reaches 80C the boiler will drop to
minimum rate until the flue temperature drops to 70C. If the flue temperature
reaches 90C the boiler will shutdown.)
7
Software version of boiler (not relevant to normal fault diagnosis)
6
System water pressure, in bar. (Maximum 2.5 bar, minimum 0.6 bar. The boiler will
shut down if the water pressure drops below 0.5 bar)
5
N.A.
4
Actual CH return temperature (maximum 72C) (NB Flow temperatures more than
20C above return temperature may lead to overheat and noise problems. Check
the pump performance and the system for blockages)
3
Actual CH flow temperature (maximum 84C)
2
The flame current (in micro amps) detected from the burner (should be <2 when off
and >5 when burner on. Low flame current readings suggest poor combustion and
may lead to flame lockouts. Check gas supply, air supply and combustion setting.)
1
Meaning
Display
You can return to the normal display mode at any time by pressing the “Reset” button
once.
During normal operation the green lamps beside the “1st STAT” +/- buttons and “2nd
STAT” +/- buttons indicate the mode of operation. If the lamp is not lit then no demand for
that function (ie “1st STAT” or “2nd STAT”) is present. A demand is received by a 230V
signal to SL1 or SL2 or via the Keston Room Control unit.
If the lamp is lit the boiler is on, or is starting up, to serve the demand for that function. If
the lamp is flashing the demand is still present but the burner is off because the unit
exceeded the desired temperature and the forced anti-cycle delay has not elapsed.
WD500
Chapter 6 : Fault Finding
The Keston Q37 & Q37P Boilers
Installation & Servicing Instructions
Page : 32
