Alpha Alpha HE Boiler Range Operating instructions

Brand: Alpha

Model: Alpha HE Boiler Range

Type: Operating instructions

This manual is also suitable for

Alpha Alpha HE Boiler Range combines efficiency and reliability to provide ultimate home heating solutions. With its advanced modulating coil technology, it delivers precise temperature control and energy savings. The boiler's user-friendly interface allows for effortless operation, while its compact design ensures easy installation. Backed by Alpha's commitment to quality, this boiler offers peace of mind and exceptional performance.

Room sealed chamber

pressure tube

Modulating

coil wires

End cap (A)

Burner

pressure

test point

Inlet gas

pressure

test point

Modulating coil

Minimum adjustment

nut (B) 5 mm

Maximum adjustment

nut (C) 8 mm

Instructions for setting the burner

pressure on a replacement gas valve

Alpha HE/CB/SY/C Boiler Range

1. GENERAL

The maximum and minimum burner pressures are factory set and should not require adjustment. However, if the gas valve

has been replaced, then these burner pressures must be set by adjustment on the gas valve.

Refer to the Installation and Servicing instructions for gaining access to and for replacement of the gas valve.

Note: Ensure that the plastic tube between the gas valve and the room sealed chamber is correctly fitted.

2. SETTING THE MAXIMUM BURNER PRESSURE

a. Loosen the burner pressure test point on the gas valve (see

Fig. 1) and connect a pressure gauge.

b. Remove the end cap (A in Fig. 1) to reveal the two adjustment

nuts (B and C in Fig. 1).

c. Set the selector switch to (DHW only) and turn the hot

water thermostat to the maximum position.

d. Fully open a hot water tap to give the maximum water flow rate.

e. Using an 8 mm spanner, turn the maximum adjustment nut (C in

Fig. 1) to set the maximum burner pressure (see table below). If

the burner fails to light, continue to turn the adjustment nut (C)

clockwise until a burner pressure is obtained. During this

adjustment the selector switch may have to be turned to 'RESET'.

If so, wait 30 seconds each time before resetting.

Note: Clockwise to Increase the pressure. Anticlockwise to Decrease the pressure.

3. SETTING THE MINIMUM BURNER PRESSURE

a. After the maximum burner pressure has been achieved, the minimum pressure can be adjusted by removing one of the

modulating coil (Black) wires. The burner pressure will now be at the minimum setting.

b. Using a 5 mm spanner, turn the minimum adjustment nut (B in Fig. 1) to set the minimum burner pressure (see table below).

Note: It is advisable to hold the maximum adjustment nut (C) with an 8 mm spanner, when adjusting the minimum nut (B).

c. Reconnect the modulating coil (Black) wire and recheck the maximum pressure. Continue to readjust and recheck until

both the maximum and minimum burner pressures are as shown in the table.

d. Disconnect the pressure gauge and tighten the test point screw.

e. Test for gas soundness using a suitable leak detection fluid.

Fig. 1

Maximum Burner Pressure

Nat. Gas LPG

mbar

10.7

11.7

10.0

10.9

11.3

12.3

11.6

mbar

35.5

36.0

36.7

36.0

36.9

32.3

32.1

in w.g.

4.28

4.68

4.00

4.36

4.52

4.92

4.64

in w.g.

14.20

14.40

14.70

14.40

14.76

12.92

12.84

Boiler model

CB24, CB24X, SY24

CB28, CB28X

CB50

C23

C27

HECB25, HE25, HESY25

HECB33, HE33

Minimum Burner Pressure

Nat. Gas LPG

mbar

2.2

2.5

1.7

2.3

2.15

1.9

1.2

mbar

7.2

7.5

6.5

7.3

7.0

5.6

4.7

in w.g.

0.90

1.00

0.68

0.90

0.76

0.48

in w.g.

2.90

3.00

2.60

2.92

2.80

2.24

1.88

/80/30112653 )07610( :leT - 0002 snoitacilbuP yb dengised dna delipmoc launaM D217

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.

Nepicar House, London Road, Wrotham Heath,

Sevenoaks, Kent TN15 7RS

Tel: 0870 3001964

email: info@alphatherm.co.uk

website: www.alpha-innovation.co.uk

Alpha Alpha HE Boiler Range Operating instructions

Brand: Alpha

Model: Alpha HE Boiler Range

Type: Operating instructions

This manual is also suitable for

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Alpha Alpha HE Boiler Range Operating instructions

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