been fired for more
than one hour since
installation,
the
CO
levels
should
not
exceed 150 ppm at
high rate and 50 ppm at
low rate. If CO levels
above these values are
experienced,
the
combustion
chamber
and flue system should
be investigated.
The Q37 is factory set
for
combustion
and
should
need
no
adjustment.
However,
in the event adjustment
is required.
Check combustion errors are not a result of incorrectly installed flue and/or air system,
gas inlet pressure, gas rate, terminal location or damage or debris on the burner. If all
these factors are found to be in order precede as follows:
1)
Set any controls to call for heat.
2)
Press and hold the “2nd STAT ONLY” button until the display changes to flashing
“t99” then release the button.
3)
Measure the CO
2
reading in the flue gases and adjust, if necessary, the
adjustment screw (pos 4) to produce a CO
2
reading of 8.9% to 9.3% with a
corresponding CO level of 50 to 150 ppm for natural gas and 10.3 to 10.7% with a
corresponding CO level of 50 to 150 ppm for LPG. NORMAL ADJUSTMENT,IF
REQUIRED, SHOULD NEED NO MORE THAN HALF OF ONE ROTATION OF
THE ADJUSTMENT SCREW (pos. 4). ADJUSTMENTS, IF MADE, SHOULD BE
IN STEPS OF NO MORE THAN 1/8 OF A TURN. YOU MUST WAIT 1 MINUTE
AFTER EACH ADJUSTMENT TO ALLOW THE SETTING TO STABILISE
BEFORE TAKING A READING.
4)
Using the “-” button for “1st STAT” temperature control, adjust the display to “t00”
(minimum fan speed)
5)
Measure the CO
2
reading in the flue gases. The CO
2
reading must be 8.4% to
8.8% with a corresponding CO level of 5 to 20 ppm for natural gas and 9.5% to
9.9% with a corresponding CO level of 5 to 20 ppm for LPG. THE CO2 LEVEL AT
LOW RATE MUST ALWAYS BE LESS THAN THE CO2 LEVEL AT HIGH RATE.
ADJUSTMENTS, IF MADE, SHOULD BE IN STEPS OF NO MORE THAN 1/8 OF
A TURN. YOU MUST WAIT 1 MINUTE AFTER EACH ADJUSTMENT TO
ALLOW THE SETTING TO STABILISE BEFORE TAKING A READING
6)
Using the “+” button for CH temperature control, adjust the display back to
flashing “t99” and check the CO
2
level is in the range indicated at point 3)
IN THE EVENT THAT AN ACCEPTABLE COMBUSTION LEVEL CANNOT BE
OBTAINED AT EITHER HIGH OR LOW RATE, CONTACT KESTON TECHNICAL
SUPPORT ON 0208 462 0262. DO NOT LEAVE THE APPLIANCE RUNNING UNLESS
ACCEPTABLE COMBUSTION LEVELS ARE ACHIEVED.
5.8
CHECKING THE GAS PRESSURE
NB:
It is advisable to carry out this test with the user control knob turned to maximum
and the system water cold to ensure the boiler is running at maximum rate.
The gas setting is factory adjusted to within the required range and should not need
adjustment. If the reading is incorrect then check such factors as soundness of the air and
WD500 Chapter 5 : Commissioning
The Keston Q37 & Q37P Boilers
Installation & Servicing Instructions
Page : 28
