Baxi Genesis 80 User guide

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Please leave these Instructions with the User
Baxi Genesis
Gas Fired Wall Mounted Combination Boiler
Natural Gas, Propane & Butane
Comp No. 236463 - 10/96
Baxi Genesis 80 – G.C.No47 077 01
Baxi Genesis 96 – G.C.No47 077 02
Installation
and
Servicing
Instructions

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Baxi Heating Ltd is one of the leading manufacturers of
domestic heating products in the U.K.
Our first priority is to give a high quality service to our
customers. Quality is built into every Baxi product -products
which fulfil the demands and needs of consumers, offering
choice, efficiency and reliability.
To keep ahead of changing trends, we have made a
commitment to develop new ideas using the latest
technology - with the aim of continuing to make the products
that customers want to buy.
Baxi is also the largest manufacturing partnership in the
country. Everyone who works at the company has a
commitment to quality because, as shareholders, we know
that satisfied customers mean continued success.
We hope you get a satisfactory service from Baxi. If not,
please let us know
Baxi is a BS-EN ISO 9002 Accredited Company

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Contents – Page 3
Introduction PAGE 4
General Layout PAGE 5
Appliance Operation PAGE 6
Technical Data PAGE 7-8
General Dimensions & Fixings PAGE 9
System Details PAGE 10-12
Central Heating circuit
Bypass
System Control
System Filling & Pressurising
Pressure Vessel
Pressure Relief Valve
Domestic Hot Water Circuit
Showers
Hard Water Areas
Site Requirements PAGE 13-16
B.S. Codes of Practice
Clearances
Location
Ventilation of Compartments
Gas Supply
Electrical Supply
Flue
Terminal Guard
Installation PAGE 17-24
Initial Preparation
Flushing
Preparing the Boiler
Fitting the Boiler
Fitting the Flue
Making the Electrical Connections
Commissioning the Appliance PAGE 26
Servicing The Appliance PAGE 27
Changing Components PAGE 28-41
Pressure Switch
Fan
Gas Valve Solenoids
Domestic Hot Water Heat Exchanger
Heat Exchanger
Pump
PCB & Spark Generator
Thermistors
Safety Thermostat
Expansion Vessel
Pressure Relief Valve
Pressure Gauge
Flow Switches
Flame Sensing Probe
Spark Electrode
Injector Manifold
3-Way Valve
Water Filters
Automatic Air Vent
Flow Regulator
Fault Finding PAGE 42-50
Short Parts List PAGE 51

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Introduction – Page 4
Description
The Baxi Genesis is a fully automatic gas fired wall mounted
combination boiler. It is room sealed and fan assisted, and
will serve central heating and mains fed domestic hot water.
Genesis 80
The boiler is preset to give a maximum output of 23.25 kW
(79,347 Btu/hr) for both hot water and central heating
modes.
Genesis 96
The boiler is preset to give a maximum output of 28.0 kW
(95,555 Btu/hr) for both hot water and central heating
modes.
It is designed for use on natural gas (G20). Using the
conversion kit it can be used on LPG (Propane G31 or
Butane G30).
The boiler is suitable for use only on fully pumped sealed
heating systems. Priority is given to domestic hot water.
The appliance data badge is positioned on the electrical box
behind the outer case.
A label on the user door panel gives details of the model,
serial number and Gas Council number.
Optional Extras
KIT PART No
Flue extension 1 M (Use two kits for 2M etc.) 236439
Flue Extension 0.25M 238605
Flue Extension 0.5M 238604
DHW Expansion Vessel Kit 238395
Wall liner/internal fixing 236441
Programmable room thermostat 24 hr. 236254
Programmable room thermostat 7 day 238326
Integral 7 day Electronic Timer Kit 238399
Integral 12 hr. AM/PM 8ectro-Mechanical
Timer Kit 238398
80 LPG Conversion - Propane & Butane 235983
96 LPG Conversion - Propane & Butane 237474
Flue bend - 45º 236467
Flue bend - 90º 236466
Vertical Flue Equipment -
See Installer’s Guide or Notes For Guidance

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General Layout – Page 5
1Chassis with Expansion Vessel
2Combustion Box
3Fan Assembly
4Primary Heat Exchanger
5Combustion Chamber
6Burner Assembly and Electrodes
7Gas Valve Assembly
8Automatic Air Seperator and Vent
9Flow Switch Heating Circuit
10 Flow Switch DHW Circuit
11 Circulation Pump
12 Electrical Box
13 Safety Thermostat
14 By-Pass Valve
15 DHW Thermostat Sensor
16 CH Thermostat Sensor
17 Three Way Valve
18 DHW Plate Heat Exchanger
19 Selector Switch On-Off
20 DHW Temperature Adjustment
21 Heating Temperature Adjustment
22 Heating Temperature Indicator
23 Green Light - Power On
24 Orange Light - Boiler On
25 Red Light - Flame Failure
26 Flame Failure Reset Button
27 Pressure Gauge
28 Pressure Switch
29 Isolating Valves
30 Optional Integral Timers

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Appliance Operation – Page 6
CENTRAL HEATING MODE
With a demand for heating the pump (11) circulates water
through the primary circuit. At a flow rate of approximately
250 I/hr the central heating flow switch (9) operates,
commencing the ignition sequence.
The main burner (6) ignites at 1/3 rate then switches to full
gas rate. The gas valve (7) controls the gas rate “HIGH -
LOW” to maintain the heating temperature measured by the
thermostat sensor (16).
When demand is satisfied the burner is extinguished, the
pump continues to run. The duration of each OFF cycle is 3
minutes before re-lighting automatically. Each ON cycle
commences with a 45 second duration at third gas rate
before switching to full rate if necessary.
On completion of a heating period the pump will continue to
run for a period of 3 minutes (PUMP OVERRUN).
DOMESTIC HOT WATER MODE
Priority is given to hot water supply. A demand at a tap or
shower will override any central heating requirement.
The flow of cold water will operate the DHW flow switch (10)
which requests the 3 way valve (17) to change position to
allow the pump (11) to circulate the primary water through
the secondary DHW heat exchanger (18).
The appliance-will light automatically and the temperature of
the domestic water is controlled by the thermostat sensor
(15).
When the hot water demand ceases the burner will
extinguish and for a period of 3 minutes the appliance
remains ready in the DHW mode before returning to the
central heating mode.

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Technical Data – Page 7
GENESIS 80

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Technical Data – Page 8
GENESIS 96

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General Dimensions and Fixings – Page 9

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System Details – Page 10
The Genesis Combination Boiler is a ‘Water Byelaws
Scheme - Approved Product’.
To comply with the Water Byelaws your attention is
drawn to the following installation requirements and
notes (IRN).
1) IRN 001 - See text of entry for installation requirements
and notes.
2) IRN 116- Byelaw 90 and 91.
3) IAN 302 - Byelaw 14.
Reference to the WRc publications, ‘Water fittings and
materials directory’ and ‘Water supply byelaws guide’ give
full details of byelaws and the IRNs.
Central Heating Circuit
The appliance is suitable for fully pumped SEALED
SYSTEMS ONLY.
All systems should be thoroughly flushed prior to
connection of the appliance. If the installation is on an
existing sealed system, or a modified open system, it is
particularly important to flush preferably using an
appropriate descaling/flushing agent.
Where used, corrosion inhibitors, flushing agents/descalers
should be approved and suitable for all system metals.
BYPASS
The appliance has an integral pre-set bypass, therefore no
external bypass on the system is required. TRV’s can be -
used on all radiators.
SYSTEM CONTROL
Operation of the system under control of the boiler
thermostat only does not produce the best results. The
heating system should include a control system. This should
comprise of at least a single channel timer.
Integral Single Channel Timer Kits are available as optional
extras.
For optimum operating conditions and best economy the
fitting of a programmable thermostat is recommended.
Programmable thermostats - the ‘Baxi Genesis
Controllers’ are available as an optional extra.