Potterton Titanium 12 Heat Guida rapida

Titanium Heat

12 - 15 - 18 - 24 - 30

Condensing Central Heating Boiler

United Kingdom

Engineer’s Service Manual

1. Contents

1 Contents 2

2 General Description 3

2.1 Alpha Codes 3

2.2 Main component parts 3

3 Sequence of operation 4

4 Boiler layout 5

5 HMI 6

5.1 L.E.D sequences 6

6 Electrical connections 7

6.1 Wiring diagrams 7

6.2 Boiler electrical diagram 8

6.3 Useful electrical checks 9

6.4 Checking the operational (working)

gas pressure 9

6.5 Measuring the gas rate 9

7 Setting and checking the air/gas ratio 10

7.1 Setting the boiler to full & part load 10

8 Error codes 11

8.1 Shutdowns and lock-outs 11

8.1.1 Blocking 11

8.1.2 Lock out 11

8.1.3 Hard Reset 13

9 Maintenance 14

9.1 General 14

9.2 Standard Inspection & Maintenance

Operation 15

10 Spare parts 17

10.1 General 17

10.2 Spare Parts List 17

11 Notes 18

7668920

Code

Number

Alpha

Code

Gas Council

Number

Model

Potterton Titanium 12 Heat RWW 41-592-61

7668922 Potterton Titanium 15 Heat RXE 41-592-62

7668923 Potterton Titanium 18 Heat RXF 41-592-63

7668924 Potterton Titanium 24 Heat RXM 41-592-64

7668925 Potterton Titanium 30 Heat RXX 41-592-65

2.1 Appliance Alpha Codes

Burner

Heat Exchanger

Gas Valve

PCB

Fan

Premix

Aluminium

SIT 848 1:1 ratio

SIT-R

Natalini DC

The Potterton Titanium Heat models use the following component parts:

2.2 Main component parts

1. The Potterton Titanium Heat models are gas fired wall mounted powered flue condensing boilers.

2. The boiler modulates automatically to the system load up to the set output. It is designed for use on Natural Gas

(G20) only.

3. The two illuminated User Interaction Controller push buttons provide information about the operating condition of

the boiler.

4. The boiler is suitable for fully pumped open vented central heating and domestic hot water systems and sealed

systems.

5. An information label giving details of the model, serial number and Gas Council number is situated on the front left

underside of the outer case and is accessed by pulling forward gently.

6. The boiler data label is positioned on the inside lower right-hand side of the boiler and can be seen when the outer

case panel is removed.

7. The boiler is intended to be installed in residential/domestic environments on a governed meter supply only.

8. The boiler is installed with one of the purpose designed flues such as one of the standard telescopic flue kits

detailed in the Flue Accessories & Fitting Guide.

9. All systems must be thoroughly cleansed, flushed and treated with inhibitor.

10. This Engineer’s Manual should be read in conjunction with the Installation & Service Manual supplied in the

Literature Pack.

2. General Description

3. Sequence of Operation

Mains ON

(CH or DHWdemand)

Self-test cycle for 20 s

(output setting displayed)

Flow temperature

less than set point

10 second pre purge

5 second ignition

Flame detected

5th ignition attempt

Ignition lockout

Burner ON

Modulate output

Flow temperature or

rate of rise too high

Burner OFF

Over temperature

fault

Lock out

Mains OFF

(demand satisfied)

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 light 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. Over temperature: If a boiler over temperature

event occurs (triggering the safety thermostat) the

burner shuts down (Fan off and Gas Valve off). A

locking signal is generated and an error lightis

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 a hard reset is required see section 8.1.3

Baxi Customer Support 0344 871 1525

4. Boiler Layout

Potterton Titanium Heat main components

1. Heat Exchanger

2. Combustion Control Unit

3. Condensate Trap

4. Exhaust Tube

5. Inlet Silencer

6. User Interaction Controller

7. Gas Cock

8. Air Pressure Switch (24 & 30 model only)

9. System Drain Cock

10. Air Vent

5.0 HMI

5.1 LED sequences

Boiler in operation

Demand

Blocking

Temperature protection

Blocking input

Flame loss

Communication error

Parameter or id fault

Miscellaneous

Lockout

Sensor error

Max temp protection

Ignition fault

Fan fault

Parameter error

Miscellaneous

Reset

Working with reset

The HMI has 2 illuminating push buttons which provide information about the operating condition of the boiler.

The ‘RESET’ button lights up green when the boiler has a demand.

The ‘Chimney Sweep’ button can flash in a range of colours and at different frequencies.

The HMI also has one rotary knob. The rotary knob can be used to set the maximum flow temperature of the

heating water.

The temperature on this rotary knob must be set to a higher temperature than the cylinder thermostat to

achieve the required hot water demand.

Chimney sweep mode

Minimum

Maximum

PCB programming

1 Heating water temperature rotary knob

2 Chimney Sweep button and Status signals

3 RESET-button and on/off signal

1 2 3

The boiler is supplied with 1 metre of 3 core cable connect-

ed to the boiler.

Switched live must be connected to the brown (live) wire of

the 3 core cable.

Connecting External Devices:

This boiler operates on a switched live only.

To comply with Part L1 of the Building Regulations the

heating system into which the boiler is installed should

include the following:

a) Zone Controls

b) Timing Controls

c) Boiler Control Interlocks (Room & Cylinder

Thermostats)

Such a system needs to be fully pumped and must provide

independent temperature and time control to both the

heating and hot water circuits.

Connection diagrams for Y and S plan systems are shown

below.

6.1 Wiring Diagrams

‘S’ Plan, Room Thermostat System, CH Interlocked by Room

Thermostat. At least the Radiator(s) near the Room Thermostat

without TRVs. Pump runs from Switched Live.

‘Y’ Plan, Room Thermostat System, CH Interlocked by Room

Thermostat. At least the Radiator(s) near the Room Thermostat

without TRVs. Pump runs from Switched Live.

Key to colours

b Blue br Brown w White

o Orange gr Grey g/y Green & Yellow

Y Plan

Diverter

Valve

Cylinder

Stat

Room

Stat

Boiler

PumpPump

Timer

230V

50Hz

L N E

CH on

HW on

HW off

LN E

L N P/FE

g/y w

C 2

g/y

S Plan

Valve

Cylinder

Stat

Room

Stat

Boiler

Pump

Timer

230V

50Hz

L N E

CH on

HW on

LN E

L NE

Motor

S Plan

Valve

Motor

g/y

6.0 Electrical Connections

3 Core Cable - 1 metre

supplied connected to boiler

6.2 Boiler Electrical Diagram

Pressure Switch

Titanium Heat 24 & 30 Models only

Gas Valve

Electrode

g/y

Electrical

Test Point

Mains

g/y

Safety

Thermostat

Return

Sensor

Flow

Sensor

Parameter

Unit

User Interaction

Controller

Not used

Loop Connector

(where no Pressure

Switch fitted)

Key To Wiring Colours

b - Blue

r - Red

br - Brown

g/y - Green/Yellow

bk - Black

FROM TO COLOUR LINK

PRESSURE SWITCH

COMBI ONLY

FLOW TEMP

RETURN TEMP

FLOW SENSOR

HIGH LIMIT BLACK

BLACK

BLUE

RED

PSU

BLACK

HIGH LIMIT

13 1

23456

bk bk

RS232

HMI

PSU

APS

g/y

6.3. Useful Electrical Checks

RS232

Computer connection

Return sensor

Ignition transformer

Flow sensor

Ignition/ionisation electrode

PSU

Storage parameter

Power supply

HMI

Connection box

Safety thermostat

APS

Air pressure switch

Plug

Function

Pins

Colours

Voltage

Resistance

X1 Mains

1 – 2

G/Y – Br

240v AC

N/A

1 – 3

G/Y – B

0 -15v AC

N/A

2 – 3

Br – B

240v AC

N/A

Flow Thermistor

7 – 8

Bk – R

12kΩ @ 25°C

Return Thermistor

6 – 7

B – Bk

12kΩ @ 25°C

Safety Thermostat / Air

Pressure Switch

1 – 13 Bk – Bk

Closed circuit under

110°C

X8 Gas Valve

L – N

Br – B

240v AC

780Ω

N – E

B – G/Y

0 -15v AC

N/A

L – E

Br – G/Y

240v AC

N/A

Fan Part Load

C1 – C2

Y – Y

124 – 129v AC

75Ω

Fan Max CH Load

C1 – C2

Y – Y

238 – 243v AC

Fan Max HW Load

C1 – C2

Y – Y

263 – 265v AC

12 1.42

15 1.75

18 2.07

2.73

30 3.27

Model m3/hr

6.4. Checking the Operational (Working) Gas Inlet Pressure

Ensure that all controls are calling for heat and maximum load is applied to the system see ‘Chimney Sweep’ mode

(see section 7)

2. With the boiler operating in the maximum rate condition check that the operational (working) gas pressure at the

gas cock in accordance with B.S. 6798 & B.S. 6891.

3. Ensure that the 20mbar inlet pressure can be obtained with all other gas appliances in the property working.

Gas inlet pressure point

6.5. Measuring the gas rate

With any other appliances & pilot lights turned OFF the gas rate can be measured(see chart below).

U6 Gas rate = 100.8÷Time in sec for 1ft³ of gas=________M³/hr

E6 Gas rate = Two minutes of gas x 30=_______M³/hr

EV1

EV2

P. OUT

1 2 3 4

VENT

ADJ.

‘A’

Max Rate

Adjustment

Screw

(cover removed)

‘B’

MIN rate

Adjustment

Screw

(cap fitted)

Reduce CO 2

at MIN. rate

Increase CO

at MIN. rate

Reduce CO 2

at MAX. rate

7.0 Setting and checking the air/gas ratio

7.1 Setting the boiler to full load & part load

Use this procedure when Commissioning, Servicing &

Replacing the Gas valve.

The full load status can only be reached via the part load

status.

1. Press the Chimney Sweep button for around 3 seconds.

The status signal for the Chimney Sweep button is orange

and flashes green briefly; Part load is selected.

2. Press the Chimney Sweep button again twice. The

status signal for the Chimney Sweep button is orange and

goes off briefly twice; Full load is selected.

3. Remove the plug of the flue gas measurement point.

4. Insert the probe for the flue gas analyser into the

measurement opening. See Fig for the position of control

screw A for full load adjustment.

5. Check the CO

is 9.3% ±0.1% (Case OFF). If the CO

too low, turn the screw A anticlockwise to increase (2.5mm

Allen key). If the CO

is too high, turn the screw A clock-

wise to decrease. Now part load needs to be selected

6. Press the Chimney Sweep button again to return to part

load. The status signal for the Chimney Sweep button is

orange and flashes green briefly; Part load is selected.

See drawing for the position of control screw B for part

load.

7. Check the CO

is 8.9% ± 0.1% (Case OFF). If the CO

is too high, turn the screw B anticlockwise to reduce (4mm

Allen key). If CO

is too low, turn the screw B clockwise to

increase.

8. Briefly press the RESET button to return the boiler to

normal operating status.

9. Remove the probe for the flue gas analyser from the

measurement opening.

10. Refit the plug of the flue gas measurement point.

WARNING!

The full load value must be at least 0.4%

higher than the part load value. If this gap

has not been achieved the values must be

reset.

Plug

Analyser Probe

Flue Sampling

Point

After refitting the sampling

point plug ensure there is

no leakage of products !

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