Alpha Alpha CB24 Guide de démarrage rapide

Instructions for adjusting a

replacement printed circuit board

Alpha CB/SY/C Boiler Range

1. GENERAL

When the Printed Circuit Board (PCB) is replaced the following adjustments must be carried out:-

a. Set the ignition gas rate so that the ignition of the burner is smooth and quiet.

b. Adjust the central heating output.

c. Ensure that the JP1 plug is correctly positioned for the type of gas the boiler is being used with.

MET - Natural Gas LPG - Liquefied Petroleum Gas

d. Ensure that all electrical plugs and connectors are pushed fully home and soundly connected.

Note: Before fitting a new PCB ensure the polarity of the electrical supply is correct by testing the supply, using a

suitable multimeter, as follows:-

Live to Neutral 240 Volts AC

Live to Earth 240 Volts AC

Neutral to Earth zero Volts AC

Note: i) Before fitting the PCB, carefully bend the red and yellow neons through 180° so that they locate into the

control panel - see Fig. 1 or 2.

ii) When the selector switch is turned to the reset position, there will be a delay of approximately 30 seconds

before the PCB will reset.

2. FIT AND ADJUSTTHE REPLACEMENT PCB

Refer to the Installation and Servicing instructions for gaining access to and for replacement of the PCB. To adjust the

PCB the gas valve burner pressures must be measured. Loosen the burner test point screw on the gas valve and

connect a pressure gauge. After adjusting the PCB disconnect the pressure gauge, tighten the test point screw and

test for gas soundness using a suitable leak detection fluid.

Set the Ignition Gas Rate (IGR)

When there is a demand for either Heating or Hot Water, the burner will light at the IGR approximately 5 - 10 seconds

until the flame sensing electrode detects the flame, then the burner pressure will increase to the required output.

During the first 5 seconds the IGR pressure must be read on the pressure gauge. If the ignition gas rate is incorrect,

adjust the IGR pressure as follows:-

a. Set the selector switch to (DHW only) and turn the hot water thermostat to the maximum position.

b. Carefully locate a small insulated screwdriver into the potentiometer P3 (IGN CAP) - see Fig. 1 or 2.

c. Fully open a hot water tap so that the boiler fires and record the IGR.

d. If the IGR is incorrect, rotate the screwdriver (Clockwise to Increase - Anticlockwise to Decrease), to achieve a

smooth ignition (see table below).

e. After each adjustment of the potentiometer, repeat the above process from paragraph c.

IGR Pressure (Approx.)

Nat. Gas LPG

mbar

5.0

3.0

5.0

mbar

10.0

in w.g.

2.0

1.2

2.0

in w.g.

5.2

Boiler

CB24, CB24X, SY24

CB28, CB28X

CB50

C23/27

Compiled and designed by Publications 2000, Tel (01670) 356211 0/04/D134

Fig. 1 - CB24/28, SY24 and C23/27

Adjustment of the Central Heating Output

The Central Heating Output will normally be set to maximum. If however the system needs to be Range - Rated, adjust

the CH output as follows:-

a. Set the selector switch to and the heating thermostat to maximum to operate the boiler on central heating.

b. Carefully locate a small insulated screwdriver into the potentiometer P4 (CH CAP) - see Fig. 1 or 2, which should be

fully clockwise.

c. To Range - Rate the heating output, the potentiometer can be turned anticlockwise to the required output.

Fully clockwise Maximum output

Fully anticlockwise Minimum output

Half way Approximately 16.1 kW (55 000 Btu/h) for CB24, CB24X, SY24 & C23

Approximately 20.5 kW (70 000 Btu/h) for CB28, CB28X, CB50 & C27

Fig. 2 - CB50

These instructions have been carefully prepared but we reserve the right to

alter the specification at any time in the interest of product improvement.

Alpha Therm Limited.

NepicarHouse,LondonRoad,WrothamHeath,

Sevenoaks, Kent TN15 7RS

Tel: 0870 3001 964

email: info@alphatherm.co.uk

website: www.alpha-innovation.co.uk

N/A C23/27

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