Keston C36 Installation Manual download pdf (Page 31)

used during manufacture curing within

the combustion chamber. On boilers

which have 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 C36 Combi 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, 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 “Summer” button until the display changes to blinking “t99”

then release the “Summer” button.

3) Measure the CO

reading in the flue gases and adjust, if necessary, the

adjustment screw (pos 4) to produce a CO

reading of 9.1% to 9.5% with a

corresponding CO level of 50 to 150 ppm for natural gas and 10.4 to 10.8% 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 CH temperature control, adjust the display to “t00”

5) Measure the CO

reading in the flue gases. The CO

reading must be 8.6% to 9%

with a corresponding CO level of 5 to 20 ppm for natural gas and 9.6% to 10%

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 “t99”

and check the CO

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 HEATING

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

flue pipe joints and the gas inlet pressure (pos. 3) (minimum 18 mbar required for natural

gas, minimum 31 mbar required for LP gas).

If all joints are sound and the gas inlet pressure is satisfactory check the gas input

by timing the gas meter as detail in Section 5.9 Timing The Gas Meter. If the gas

input cannot be measured then it’s compulsory to measure the combustion quality

as detail in Section 5.7 Combustion Testing.

WD388/0/2004 Chapter 5 : Commissioning The Keston C36 Combi & C36P Combi Boilers

Installation & Servicing Instructions Page : 26

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Keston C36 Installation Manual Page 31

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