Alpha 500E User's Instructions

User's

Instructions

Alpha 500E

Wall Mounted, Fan Assisted, Room Sealed, Gas Fired
Combination Boiler with Unvented Hot Water Storage

For Technical help or for Service call ...

ALPHA HELPLINE

Tel: [phone]

0051

Nepicar House, London Road,

Wrotham Heath, Sevenoaks,

Kent TN15 7RS

Service Listed

Alpha 500E G.C. No. 47 532 07

Building Regulations

Certificate No. ETC 00795

For use with Natural Gas only

Leave these instructions with the User

1 DESCRIPTION

The Alpha 500E boiler is a wall mounted, fan assisted room-sealed combination boiler incorporating an unvented hot water
storage cylinder. It provides both central heating and domestic hot water at mains pressure.

As supplied, the boiler is suitable for central heating systems requiring between 10.4 and 28.0 kW (35 500 and 95 550 Btu/h).
It will provide central heating (as required) during the 'on' times set on your clock (if fitted). Hot water is always available

whenever a hot tap is opened.

2 USER CONTROLS

Burner
Viewing
Window

Clock

0

Central
Heating
Thermostat

THERMOSTAT

Domestic
Hot Water
Thermostat

THERMOSTAT

0

Selector
Switch

SELECTOR

0

Indicator
Neons

RESET

White
Reset
Button

RESET

2

1

04

bar

Red
Reset
Button

3

System
Pressure
Gauge

(if fitted)

Fig. 1

3 BOILER CONTROLS

1. CENTRAL HEATING THERMOSTAT

This thermostat controls the temperature of the water leaving the boiler for the heating system. For maximum output from the
radiators the thermostat should be left at maximum. If lower heating temperatures are required, turn the thermostat anti-clockwise.

2. DOMESTIC HOT WATER THERMOSTAT

This thermostat controls the temperature of the domestic hot water leaving the boiler. For maximum hot water temperatures the
thermostat should be left at maximum. If lower temperatures are required, turn the thermostat anti-clockwise.

3. SELECTOR SWITCH

This control allows the boiler to provide central heating and hot water or hot water only. The '0' position will turn the boiler off.

4. PRESSURE GAUGE

This indicates the central heating system pressure. It should always be within the green band when cold, increasing slightly
when hot.
If the pressure falls below the green band, ie red area, the system needs re-pressurising. Contact your Installer to have the
system checked and pressurised.

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5. INDICATOR NEONS

When illuminated, the following conditions apply:-

Warning light (continuously on) - blocked flue or fan fault, contact your Service Engineer.
Overheat thermostat has operated - press white reset button (see Fig. 1) to reset.
Electrical supply to the boiler is on.
Boiler is supplying hot water.
Boiler is supplying central heating.

When the red reset button (
(see Fig. 1) and the ignition sequence will restart.

) is illuminated it indicates that the burner has failed to light - Press the red reset button

6. OVERHEAT THERMOSTAT

This thermostat automatically switches the boiler off in the unlikely event of the boiler overheating. When the thermostat
operates, the neon is illuminated. Press the white reset button (see Fig. 1) and the ignition sequence will restart.
If this continually happens, contact your Service Engineer.

7. PRESSURE RELIEF VALVES

If the central heating or hot water system overheats and steam or water is discharged from the pipe connected to the valve or from
the tundish, turn the boiler off and contact your Service Engineer. Your Installer should have told you where these pipes terminate.

8. FROST THERMOSTAT

The boiler has a built-in frost thermostat, which automatically operates the boiler if the water temperature falls below 5°C,
providing the electrical supply neon

is illuminated.

4 LIGHTING INSTRUCTIONS

Refer to Fig. 1 for boiler controls.

1. Ensure the following:­a. Electrical supply to the boiler is off.
b. All heating controls and thermostats are set to OFF or minimum position.
c. All isolation valves at the bottom of the boiler are in the open position (flats on the spindle in line with the valves).
d. The gas and water supplies are on at the mains.
e. The heating system pressure is within the green band as shown on the pressure gauge.

2. Turn the heating and hot water thermostats fully anticlockwise to 0 and set the selector switch to 0.

3. Switch on the electrical supply to the boiler.

4. Set any room thermostats to maximum and ensure that any clock is in an 'on' position. Refer to section 8, if a clock is fitted
in the boiler control panel.

5. Set the selector switch to

6. Turn the hot water thermostat fully clockwise. The main burner will light and the hot water storage cylinder will be heated.
After approximately 12 minutes (from cold) the boiler will be ready to provide hot water and the burner will go out.

7. Set the selector switch to
burner will light and the boiler will provide central heating.

8. Set the boiler and all other controls, ie room thermostat etc, to the desired positions.

(hot water only). The neon will illuminate, indicating the electrical supply to the boiler is on.

(central heating and hot water) and turn the heating thermostat fully clockwise. The main

To turn the central heating off i.e. in Summer:- Set the selector switch to
To turn the boiler off for short periods:- Set the selector switch to

Note: In this position the pump will automatically operate for 5 minutes in every 24 hours. If the water temperature falls below

5°C, the built-in frost thermostat will operate the boiler automatically until the temperature of the water in the heating system
has been raised.

To turn the boiler off for longer periods:- Set the selector switch to 0. Switch off the electrical supply to the boiler. If required,
all supplies i.e. gas, water and electricity may be turned off at the mains. If there is any possibility of the boiler being left during
frost conditions, then the boiler and system should be drained and a label attached to the boiler drawing attention that the
system has been drained. If this is required, contact your Service Engineer.

(hot water only).

(hot water only).

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