REMEHA Selecta Manual

Remeha Selecta

• High-efficiency condensing

boilers for wall mounted

installation

• Output: 16 kW (CH)

24 kW (DHW)

Technical information

Remeha Selecta combi and

Selecta system boiler

Remeha Selecta

TABLE OF CONTENTS

Preface 5

1 General requirements 6

2 Appliance introduction 7

2.1 Central Heating Control 7

2.2 Working principle 9

2.3 Combi boiler operation 9

2.4 Advanced boiler control (‘abc’- control) 9

3 Dimensions and technical data 10

3.1 Dimensions 10

3.2 Technical details 12

3.3 General Specifications 13

3.4 Optional Accessoiries 14

4 Installation instructions 15

4.3 Boiler mounting 15

4.3.1 Clearance requirements 15

4.1 General 15

4.2 Boiler positioning 15

4.3.2 Mounting frame 16

4.3.3 Wall bracket 17

4.4 Flue gas discharge and air supply 17

4.4.1 Flue terminal positions 18

4.5 Type of arrangement in connection with flue gas discharge 19

4.5.1 Single boiler, concentric room sealed flue 19

4.6 Installation data 21

4.6.1 Condensate drain 21

4.6.2 Water treatment 21

4.6.3 Safety valve discharge 22

4.6.4 Expansion vessel 22

4.6.5 Circulation pump 23

4.6.6 Heating Water flow 24

4.6.7 Water connections 24

4.6.8 Filling the system/ make up water 26

5 Gas connection 26

5.1 Gas connection 26

5.2 Gas pressures 26

5.3 Gas/air ratio regulation 26

6 Electrical connection 27

6.1 General 27

6.1.1 Mains voltage 27

6.1.2 Control connections 27

7 Controls 31

7.1 Control box 31

7.2 Boiler control 32

7.2.1 Introduction 32

7.2.2 Simple time clock and on/off room thermostat (control based on

time and room temperature) 32

7.2.3 Modulating OpenTherm® room controller (control based on time

and room temperature) 32

7.2.4 Outside-temperature sensor (control based on outside temperature

and settings as in Fig. 20) 32

7.2.5 Frost protection 34

7.2.6 Boiler temperature control 34

7.2.7 Low water level protection 34

7.2.8 Maximum protection (over heat thermostat) 34

8 Commissioning 36

8.1 Putting into operation 36

8.2 Gas rate measuring 37

8.3 Handing over 38

9 Control 39

9.1 The instrument panel 39

9.1.1 General 39

9.1.2 Instrument panel structure 39

9.2 Meaning of the various modes 40

9.2.1 General 40

9.2.2 Temperature mode 40

9.2.3 Programming mode 40

9.2.4 Service mode 43

9.2.5 ‘Forced High’ mode 43

9.2.6 ‘Forced Low’ mode 44

9.3 Adjusting parameters for the installer 44

9.3.1 DHW three-way valve (J) 46

9.3.2 Pump speed - central heating operation (L) 46

9.4 Putting the boiler out of operation 46

Remeha Selecta

For user instructions: See inside boiler control cover.

10 Fault finding 47

10.1 Fault finding table 47

10.2 Fault codes 47

11 Service & maintenance 50

11.1 General. 50

11.2 Inspection 50

11.2.1 Checking the boiler combustion 50

11.2.2 CO2/O2 adjustment 51

11.2.3 Cleaning the siphon 53

11.2.4 Checking the ignition electrode, cable and gasket 54

11.2.5 Checking and cleaning the inspection glass 55

11.2.6 Checking for leakage (water, gas and flue gas side) 56

11.2.7 Checking the expansion vessel 57

11.3 Maintenance 58

11.4 Part list Selecta system boiler 62

11.5 Part list Selecta combi boiler 66

PREFACE

These technical instructions contain useful and important information for the correct instal-

lation, operation and maintenance of the Remeha Selecta combi and system boilers.

Read these instructions carefully before putting the boiler into operation, familiarise

yourself with their control functions and operation, strictly observing the instructions

given. Failure to do so may invalidate warranty or prevent the boiler from operating

correctly.

Installation must be in accordance with current gas safety (installation and use) regula-

tions, the building regulations and relevant codes of practice.

The installation, commissioning and servicing of the boiler must be carried out by a

competent person who holds valid ACS certification and to be a member of CORGI.

All electrical work must be carried out by a competent person and to be installed in

accordance with the current IEE regulations.

Note: On completion a copy of the commissioning certificate should be completed and

left with the customer.

If you have any questions, require an engineer to call on site, or if you need more

information about specific subjects relating to this boiler, or it’s installation please do

not hesitate to contact our technical help line 0118 978 3434.

The data published in these technical instructions is based on the latest information (at

date of publication) and may be subject to revisions.

We reserve the right to continuous development in both design and manufacture,

therefore any changes to the technology employed may not be retrospective nor may

we be obliged to adjust earlier supplies accordingly.

Remeha Selecta

1 GENERAL REQUIREMENTS

Under the Gas Safety (Installation & Use) Regulations 1998, the Remeha Selecta, in

common with all gas appliances, must be installed by a competent person in accordance

with that regulation. Statutory regulations in any country, cannot be overridden by any

of the notes or instructions from the manufacturer. Compliance with National Standards

does not provide any degree of immunity from legal obligations. In the UK, the instal-

lation must be in accordance with the national and local norms and requirements. In

normal operation, the boiler will produce a visible white “plume” of condensation. In

addition, the condensate produced by this type of condensing boiler is drained from the

appropriate point indicated within the instructions. For any issues or circumstances not

addressed within these instructions, please call our Customer Care Department.

The boiler meets the requirements of the EC regulations at the folowing directives:

- 90/396EEC Gas appliances directive

- 92/42/EEC Efficiency directive

- 73/23/EEC Electrical low voltage directive

- 89/336/EEC EMC directive

- 97/23/EEC Pressure equipment directive (art. 3, sub. 3)

The Remeha Selecta (Combi and System) is a Kiwa (Water regulations) approved

product. Certificate number: A030497

Fig. 01 Kiwa logo

pdf

Remeha Selecta (Combi and System) - PIN: 0063BL3537

Gas Council numbers: Remeha Selecta combi: 47-673-01

Remeha Selecta system: 41-288-01

Classification type for evacuation of the combustion products; according EN 483: see

Par. 4.4 and Par. 4.5.

Health and safety information

- The weight of the Selecta system and combi boilers exceed the maximum lift weight

for one person.

- All sealants and gaskets are free from harmfull products. On first firing the boiler, a

smell of these products may be present and should cease after a short period.

2 APPLIANCE INTRODUCTION

The Remeha Selecta is a wall mounted, fully modulating, condensing boiler, which is

available in two versions:

- Remeha Selecta combi - boiler for central heating and the production of instantane-

ous domestic hot water.

- Remeha Selecta system - boiler for central heating and hot water production via a

calorifier.

The Remeha Selecta series incorporates a pre-mix burner, frost protection, self diag-

nostic servicing LED, and lap-top/PDA connection forsetting and or interrogating the

controller. The boiler can be installed with either a vertical or horizontal concentric (fan

assisted) flue.

The boiler is designed for sealed systems only and is not intended for use with open

vented systems.

The Remeha Selecta combi is equipped with a plate heat exchanger for a rapid hot

water supply. The specially constructed cast aluminium heat exchanger is suitable

for recovery of both tangible and latent heat from the flue gas. The Remeha Selecta

combi can be used as a post-heater for solar heating panels. A continuously monitored

fully pre-mixed burner ensures low NOx and CO emissions. The closed air box means

it can be positioned in almost any space. The appliance is suitable for natural gas or

LPG (only with optional kit, available from Broag).

2.1 Central Heating Control

The central heating output can be controlled by either a standard room thermostat or

alternatively, for higher system efficiency, via the integrated OpenTherm interface. This

option offers full-modulation (100 - 25% of operating load) by using a suitable universal

controller such as the Honeywell Chronotherm Modulating programmable room con-

troller available from Broag. 230 Volt switching controls can also be used in conjunc-

tion with the optional relay kit from Broag.

Remeha Selecta

Fig. 02 Boiler layout Selecta (combi illustrated)

pdf

1. Venturi

2. Fan

3. Gas combi block

4. Air inlet tube

5. Safety valve

6. Pump

7. Expansion vessel

8. Instrument panel

9. Flow temperature sensor

(DHW; combi boiler only)

10. Plate heat exchanger

(combi boileronly)

11. Siphon / condensate outlet

12. 3-Way valve (combi boiler only)

13. Temperature sensor return

14. Heat exchanger

15. Heat exchanger inspection cover

16. Inspection glass

17. Combined ignition/ ionisation probe

18. Burner

19. Temperature sensor flow

20. Flue outlet / air inlet (60/100 mm; on

top, not visable in this picture)

2.2 Working principle

The Remeha Selecta’s casing serves as a sealed air box, with air drawn in by the

fan. On the outlet side of the fan is a venturi, into which a measured quantity of gas is

injected based on the volume of air available. The fan speed control is dependent on

the settings of the heat requirement and the prevailing temperatures (measured by the

temperature sensors).

The method of gas/air combination ensures that the gas quantity is precisely adjusted

to the air quantity. This creates optimum combustion over the whole heat input range.

The gas/air mixture is mixed in the venturi and then flows to the burner. After com-

bustion, the hot flue gas is directed through a specially designed, high efficiency cast

aluminium heat exchanger with a large surface area, and transferring its heat to the

heating water. The water vapour in the flue gas condenses against the “pins” within the

heat exchanger, and the heat released during this process (the so-called latent or con-

densation heat) is also transferred to the heating water. The condensate water formed

is discharged via a siphon on the bottom of the heat exchanger.

NOTE: In normal operation, the boiler’s flue gas discharge will produce a visible white

condensing “plume” and care should be taken when choosing a location.

2.3 Combi boiler operation

The Remeha Selecta combi contains a facility for providing domestic hot water in addi-

tion to central heating. The opening of a hot water tap is detected by a temperature

sensor, which is located on the cold water inlet side of the heat exchanger. This sensor

then activates the motorised three-way valve to provide domestic hot water. Once the

demand for hot water stops the motorised valve automatically returns to the central

heating position. This three-way valve is electrically controlled by the control box and

only consumes power when it is changing to a different position.

2.4 Advanced boiler control (‘abc’- control)

An intelligent advanced boiler control (‘abc’) continuously monitors the boiler condi-

tions and ensures a very reliable supply of heat. This control system is adept at deal-

ing with negative influences from the system such as flow reduction, airflow problems

and alike. In the event of such influences, the boiler will not go into “lock-out” failure

mode, but will in the first instance modulate back. If necessary, depending on the

nature of the circumstances, it will temporarily switch off (shutdown or control stop),

and then after a short while simply try again.

NOTE: Provided that the situation is not actually hazardous, the Remeha Selecta will

always try to supply heat. The ‘abc’- control prevents unnecessary additional call outs.

Remeha Selecta

3 DIMENSIONS AND TECHNICAL DATA

3.1 Dimensions

All dimensions of relevance to the installation of the appliance are shown in Fig. 03

and Fig. 04. For clearance details, see Fig. 05.

Fig. 03 Dimensions Selecta system

04.W5H.79.00002

ÊReturn connection 22 mm Øo/d

ÉFlow connection 22 mm Ø o/d

ÏGas connection 15 mm Øo/d

ÐCombustion air supply connection 100 mm Øi/d

ÑFlue gas discharge connection 60 mm Øi/d

ÒCondensate connection 25 mm Ø

Ù Safety valve discharge 15 mm Ø

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