Baxi MainEco Heat 15 Service Manual download pdf (Page 18)

18 MainEco Heat

3 Technical Specifications

7215845 - 01 (08/14)

4.2 Operating Principle

1. Switched Live On: When the boiler switched live turns on

the boiler, a 20 second check cycle takes place. If the flow

temperature is less than the boiler set-point temperature the

ignition cycle will start. Pre-purge, Ignition and Burner on.

2. Fan Pre-Purge: The boiler has a 10 second pre-purge (Fan

On, Spark Generator and Gas Valve off) before the start of the

ignition sequence.

3. Ignition: The boiler has a 5 second ignition period (Fan,

Spark Generator and Gas Valve on) and burner on occurs when

a flame is detected. If a flame is not detected within the 5

second ignition period then 4 more ignition attempts are made.

If a flame is not detected after the 5 ignition attempts the boiler

goes to an ignition lock-out and an error code is displayed.

4. Burner on: After a successful ignition, Burner on occurs (Fan

and Gas Valve on, Spark Generator off). The boiler flow

temperature is controlled by varying the fan speed (and thereby

the gas rate) to achieve the optimum boiler operation. If the

boiler flow temperature exceeds the boiler set-point, the burner

will turn off (Fan and Gas Valve off).

5. Overtemperature: If a boiler overtemperature event occurs

(triggering the safety thermostat) the burner shuts down (Fan off

and Gas Valve off). A locking signal is generated and an error

code is displayed.

6. Lockout: If a lock-out error is displayed (Fan, Spark

Generator and Gas Valve off) the boiler can only be reset by

manually pressing the reset button. If 5 lock-outs are reset

within a 1 hour period then boiler becomes inoperable. It is

necessary to switch off the power supply to the boiler, and when

reinstated the reset button pressed again to operate the

appliance.

Any lock-out errors that occur regularly will require further

investigation and rectification.

Technical Enquiries: 0844 871 1555.

Mains On.

(CH or DHW demand)

Self test cycle for 20s

(output setting displayed)

Flow

temperature less

than set point ?

10 second pre-purge

5 second ignition

Burner on

Modulate output

Ignition Lockout

Burner Off

Lockout

Mains Off

(Demand satisfied)

Flame detected ?

5th ignition attempt ?

YES

Flow temp or

rate of rise too

high ?

Over Temp

Fault ?

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Baxi MainEco Heat 15 Service Manual Page 18

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