Manual A.O. Smith COF 199 (page 19 of 28) (English)

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The electricity supply must comply with the requirements

below:

Supply voltage Frequency Fuse

230 V AC 50 Hz 6 A

(-15% / +10%) (+/- 2%)

The electrical diagrams of all connections in the control

box are shown in the appendix, (see figure 9: Electrical

diagram).

2.2 Commissioning

2.2.1 Filling the heater

1. Fit drain valve and check that it is closed.

2. Open the cold-water tap to the heater and all

hot-water outlets in order to remove all air from the

system. The heater has been filled when cold water

runs out at all outlets.

3. Close all taps at the hot water draining points. The

heater is now under water mains pressure. At this

pressure, which can be read on a manometer, the

relief valve must not release any water.

2.2.2 Turning on the burner

The burner must be turned on in accordance with the

installation manual supplied with the front-mounted

burner.

2.3 Shutting down

For brief periods:

1. Turn the temperature control knob fully clockwise

(up to 40°C) and set the ‘I/0’ switch to ‘0’.

For longer periods:

1. Switch off the supply voltage by operating the

bipolar main switch;

2. Close the inlet gas valve;

3. Close the water inlet tap;

4. Empty the heater to prevent frost damage.

2.4 Usage / temperature control

The water temperature is controlled by the control box on

the heater. If the temperature in the water heater drops

below the set value, the control box will send a voltage

signal to the ventilator burner. The burner automation of

the ventilator burner will then ignite the burner and keep it

burning until the control box ceases to supply voltage

signals.

The desired water temperature can be set between 40°C

and 80°C. High water temperatures cause more calcium

precipitation in the water heater. Moreover, the stand-by

losses of the water heater are greater with higher

temperatures. Therefore, it is recommended to set the

control thermostat to approx. 60°C.

For reasons of safety, the water heater is equipped with a

high-limit thermostat and an overheating cut-out. If the

high-limit thermostat is activated, the heater is not locked

and the control thermostat will take over the temperature

2.1.3 Gas connection

The gas supply to this appliance must be installed in

accordance with BS 6891 (1988) and British Gas

Publications UP1 and UP2. No heat or soldered joints

should be applied in the vicinity of the gas control, as

they could cause damage to the control. All connections

and joints should be tested for gas soundness with a

suitable leak detector (do not use a naked flame). When

operating this unit on LPG a suitable gas supply cock

should be used.

2.1.4 Flue gas exhaust

For the COF 199 and 700 the adapter ring supplied must

be fitted prior to connecting the flue gas exhaust. For the

other models (COF 245, 315, 385, 455 and 700) the flue

gas exhaust can be connected direct to the water heater.

The flue pipe, which is protected against corrosion, must

at least have the same diameter as the mounting flange

on the water heater. For units with an oil-fired burner, a

stainless steel flue pipe must be installed.

The following diameters of flue gas exhaust pipes apply:

2.1.5 Burner connection

For connecting the ventilator burner, please refer to the

instructions supplied with the burner.

Read these instructions carefully before attempting to

install and connect the burner.

2.1.6 Electrical connection

All electrical connections must be carried out in

accordance with IEE regulations by an accredited

electrical installation company.

The control box must be connected to the mains by

means of a permanent electrical connection. A bipolar

main switch with a contact opening of at least 3 mm must

be fitted between this permanent connection and the

heater.

The supply cable must have cores of at least 3 x 1.0

. The connecting clamps for the supply voltage are

located on the connector strip in the control box. Always

check with a voltage tester if the live and the neutral have

indeed been connected correctly in the control box. This

is essential for the functioning of the ventilator burner’s

flame detection.

COF 199 150

COF 245 200

COF 315 200

COF 385 200

COF 455 200

COF 700 250

UNIT Diameter flue gas

exhaust pipe [mm]

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A.O. Smith COF 199 Manual

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