Certikin MB20S User guide

Operating, Installation and Servicing Instructions for
Indirect fired condensing pool & spa heaters
M2709 Rev J
Models: MB20S, MB35S, MB50S
Genie
IMPORTANT : FOR YOUR SAFETY READ THIS
MANUAL BEFORE OPERATING THE HEATER
RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE

Condensing pool heater 2 Genie S
Blank page

1.0 Technical data 3 Genie S
1.0 TECHNICAL DATA 4
1.1 User operating and safety instructions 5
2.0 REQUIREMENTS 7
2.1 Pool chemistry 7
2.2 Cleaning 7
2.3 Safety and maintenance 7
2.4 Water temperature settings 7
2.5 Winterisation 7
2.6 Gas safety regulations 8
2.7 Location of heater 8
2.8 Gas supply 9
2.9 Gas conversion 9
2.10 Flueing 9
2.11 Air supply 9
2.12 Outdoor heaters 9
2.13 Flue terminal positions 10
2.14 Condensate drain 11
2.15 Pool pump and pipe work 11
2.16 Electricity supply 11
3.0 INSTALLATION OF HEATER 12
3.1 Procedure 12
3.2 Outdoor terminal 12
3.3 Other fl ue systems 12
3.4 Wall terminal 12
3.5 Heater & terminal dimensions 13
3.6 Flue examples and fl ue kit part codes 15
3.7 Terminal guard and roof terminal 17
3.8 Pool water plumbing 17
3.9 Condensate connections 17
3.10 Electrical connections 19
3.11 Gas connection 19
3.12 Wall mounting kit 20
3.13 Multiple heater kit 22
4.0 COMMISSIONING 24
4.1 Removal of primary air 24
4.2 Prior to burner operation 25
4.3 Pool water pressure switch 25
4.4 Conversion to LPG 25
4.5 Commissioning the burner 26
4.6 User setup mode 27
5.0 FAULT FINDING 28
5.1 Operation, safety controls & lockouts 28
5.2 Setup modes 28
5.3 Fault codes & diagnostics 29
5.4 Schematic wiring 32
6.0 SERVICING 33
6.1 Routine servicing 33
6.2 Changing components 34
6.3 Spares 36
6.4 Heater components illustrations 36
7.0 INSTALLATION & SERVICE HISTORY 38
Section Page
Contents

Condensing pool heater 4 Genie S
PERFORMANCE SPECIFICATIONS
GAS CATEGORY, TYPE AND SUPPLY PRESSURE II2H3P G20 @ 20 mbar
G31 @ 37 mbar
NATURAL GAS PROPANE
MODEL MB20S MB35S MB50S MB20S MB35S MB50S
Corgi Work Code TBA 1036909 1036910 TBA 1036913 1036914
HEAT GROSS kW 21.5 38.0 51.5 23.1 38.0 51.5
INPUT Btu/h 73,305 129,650 179,100 78,941 129,650 179,100
NET kW 19.5 34.2 46.4 21.3 35.0 47.5
Btu/h 66,392 116,700 158,300 72,842 119,400 162,000
TYPICAL EFFICIENCY % gross 92 - 94 92 - 94 92 - 94 92 - 94 92 - 94 92 - 94
% net 102 - 104 102 - 104 102 - 104 102 - 104 102 - 104 102 - 104
HEAT kW 20.0 36.9 50.0 21.5 36.9 50.0
OUTPUT Btu/h 68,175 121,870 165,170 73,415 121,870 165,170
GAS RATE (NG, Propane) m3/h 1.98 3.45 4.64 0.87 1.43 1.9
MAXIMUM RATE, CO ppm 20 - 60 120-150 80-120 35 - 70 130-160 100-130
COMBUSTION SETTINGS, NG, CO2 % 8.7 - 9.0 9.2 - 9.4 9.0 - 9.4 9.9 - 10.1 10.3 - 10.5 10.0 - 10.3
OFFSET SETTING pA -3.0 -3.0 -3.0 -3.0 -3.0 -3.0
ORIFICE mm Not required 4.4 4.4 5.2
GENERAL SPECIFICATIONS
WATER CONTENT MB20S & MB35S/MB50S 5.0 Litres / 6.0 Litres
WEIGHT (net) MB20S & MB35S/MB50S 53 kg / 55kg
DIMENSIONS, OVERALL 375 mm wide, 520 mm deep, 980 mm high
SERVICE CLEARANCE 300mm Left, Right and Above. 800 mm In front
CORE DRILL DIAMETER 175 mm
MINIMUM MB20S 50 l/m (3.0 m3/h) or 11.0 gpm
RECOMMENDED MB35S 80 l/m (4.8 m3/h) or 17.6 gpm
FLOW RATE MB50S 120 l/m (7.2m3/h) or 26.4 gpm)
MAX PRIMARY WATER PRESSURE 2½ bar (37 psi)
INTERNAL PUMP SETTING Speed 3
MAXIMUM POOL TEMP Pool 32°C (90°F) Spa 41°C (106°F)
ELECTRICAL SUPPLY 230V 50Hz, FUSED AT 5A, 130W
PROTECTION LEVEL IP44
FLUE SYSTEM 80/125 PP, to a max. Flue Equivalent Length of 20m
1.0 TECHNICAL DATA
GB, IE

1.0 Technical data 5 Genie S
Before Start Up
Pool water must be flowing through the heater and the
pressure gauge must be showing between 1.0 and 2.5
bar for it to operate
Quick Start
Check that the electricity and gas supplies are
turned on. Turn on the pool pump. Using the switch
on the front facia turn on the heater. Adjust the pool
temperature set point using the pool temperature
control knob. Within a few seconds the heater will
begin its ignition sequence.
Summary of Controls (Left to Right)
Pressure Gauge - This should normally be between
1.5 to 2.0 bar, re-pressurise if too low.
ON/OFF Switch - Turns the heater On and Off.
Lock/Reset Button - If it is pressed for 2 seconds
it locks the pool temperature setpoint so the pool
temperature knob is inoperative. To unlock, press
again for 2 seconds. When locked a short press
flashes the set temperature.
It also resets gas control lockouts, GAS and OH2.
Pool Temperature Display - This normally shows
the pool temperature but also shows the pool set
point when the pool temperature control knob is
rotated. The display is also used for commissioning
and diagnostic purposes. (see 5.2 for details)
If the display alternates the temperature with ‘SEr’ it
is recommended that the heater is serviced. In the
mean time the heater will continue to function.
1.1 USER’S OPERATING INSTRUCTIONS
DO NOT use this heater if any part has been under
water. Call a qualified service engineer to inspect
the heater and its gas controls.
There are NO user serviceable parts inside this ap-
pliance. DO NOT interfere with any sealed compo-
nents.
BEFORE OPERATING after a prolonged time off,
Check all around the appliance area for the smell
of gas.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance
• Do not touch any electric switch
• Do not use any phone in your building
• Immediately call your gas supplier from a
neighbour’s phone. Follow the gas supplier’s
instructions.
• If you cannot reach your gas supplier, call the
fire service.
• Isolate the appliance with the Service Cock
immediately next to this appliance. If this is not
accessible, isolate at the gas meter.
IMPORTANT SAFETY INFORMATION
• Drinking alcoholic beverages before or during
spa or pool use, could cause drowsiness or
physical impairment and significantly increas-
es the risk of drowning.
• Persons taking medications which induce
drowsiness should not use spas or pools.
• Persons with a medical history of heart dis-
ease, circulatory problems, diabetes, epilepsy
or blood pressure problems should seek medi-
cal advice before using pools or spas.
• Spa or pool temperatures should never ex-
ceed 40OC (104OC). 38OC (100OF) is consid-
ered safe for a healthy adult. Check the water
temperature using an accurate thermometer
before entering the pool or spa.
• Pregnant Women Beware! Soaking in water
hotter than 39OC (102OF) can be especially
dangerous during the first three months of
pregnancy
On/OffSwitch Reset/Lock
button
Temperature
display
Pool temperature
control knob
Pressure
gauge
FOR YOUR SAFETY READ BEFORE OPERATING

1.0 Technical data 6 Genie S
Pool demand LED - Green
Off- There is no pool heating demand.
On - There is pool heating demand and the pool
temperature is below set point.
Flashing - The pool heating demand is met, the pool
temperature is at or above set point.
Pool temperature control knob
16°C to 32°C (60°F to 90°F)
(Maximum is changed in setup mode, see 5.2)
Rotate clockwise to increase the pool temperature.
The temperature set point is shown whilst rotating
the control knob and when released flashes 3 times
to confirm setting.
To lock the required temperature set point see 1.1
Pool Pump & primary system pressure
-Yellow LED, display = pool temperature
On - If the pool pump is operating and there is insuf-
ficient flow pressure, possibly due to a blocked pool
filter, the heater will not operate.
On - If the internal primary system pressure has
dropped below 1.0 bar, the heater will not operate.
Refil the system and check for leaks.
Overheat - Flashing red LED, display = OH2
Flashing - This indicates the heater has overheated
and it has shutdown. Wait for the heater to cool then
press the Lock/Reset button to start the heater again.
If this problem persists this should be investigated by
a service engineer.
Overheat - Red & Yellow LED, Display = GAS
On - This indicates the heater ignition control has
locked out. Press the Lock/Reset Button to start the
heater again. If this problem persists this should be
investigated by a service engineer.
Condensate - Display = HI
This indicates that the condensate drain is blocked
and the heater has shutdown. When the blockage is
cleared, the heater will operate again.
Pool water pressure switch
A water pressure switch is provided in the heater to
shut offthe burner in the event that pool water flow is
interrupted. The water flow pressure switch should
be checked and adjusted for proper operation by a
qualified service person at the time of installation,
and thereafter checked at each service.
Internal water pressure switch
A water pressure switch is provided in the primary
water circuit of the heater, to shut offthe burner in
the event that no primary circuit water exists or is at
very low pressure. When the primary water pressure
is re-established the heater will operate again.
IMPROPER USE
This appliance has been designed and manufac-
tured to comply with the current European stan-
dards of safety. However, following an improper
use, dangers could arise concerning the safety
and life of the user or of other people, or damage
could be caused to the appliance or other objects.
This appliance is designed to be used in a pumped
swimming pool or spa heating system. Any other
usage of this appliance will be considered improp-
er.
Certikin declines any responsibility for any damage
or injuries caused by an improper use. In order to
use the appliance according to its designed scope,
it is essential to carefully follow the instructions
given in this manual.
USER COMPETENCY
This appliance is not intended for use by persons
of reduced physical, sensory or mental capabilities,
or lack of experience and knowledge, unless they
are given supervision or instruction concerning the
use of it by a person responsible for their safety.
Children under the age of 12 should not be permit-
ted to use this appliance.

2.0 Requirements 7 Genie S
2.4 WATER TEMPERATURE SETTINGS
The heater is designed to provide maximum heat output
up to 1OC below set point. Output is gradually reduced
over the last 1OC. If the pool is used before the tem-
perature reaches set point, the water entering the pool
from the heater may be noticeably warmer than the
pool water. This is not a fault but part of the design. It
will reduce for the fi nal 1OC up to set point.
Operation without pool water circulation
will cause long term and severe damage to
the heater.
2.5 WINTERISATION
Anti-freeze Inhibitor
As supplied this heater includes a dose of Sentinel
X500 anti-freeze/inhibitor. Subject to not being removed
or diluted, the appliance is protected to -10oC. If the pri-
mary circuit of the appliance is drained for any reason,
the correct quantity of new anti-freeze/inhibitor must be
added to give the level of protection required.
To add anti-freeze/inhibitor to the heater, it is recom-
mended that it is introduced into the side vent after the
primary system has been de-pressurised.
As antifreeze/inhibitor is introduced via the side vent
the top vent can be opened to minimise air venting (see
4.1 for details on venting).
Swimming pool water
With the exception of heating the water and/or keeping
the pool pump operating 24 hours per day, pool water
can not be protected against freezing.
If the above methods are not adopted in the winter
months, it is recommended that the pool water is com-
pletely drained from all pipe work and the secondary
heat exchanger.
To completely remove pool water from inside the sec-
ondary heat exchanger it may be necessary to undo the
6 bolts from one end of the heat exchanger to allow the
water inside to run out.
Failure to follow these guidelines could
cause damage to the heater which will not
be covered by warranty.
These instructions cover a range of indirect, fl oor
mounted, gas fi red, condensing pool heaters which
are room sealed and fan assisted. The fl ue system
available is concentric, left, right, rear, and vertical,
all up to 20 metres ‘FEL’. There is also an outdoor
top terminal for use where the heater is installed out
of doors. The ignition system is fully automatic.
There are three models with diff erent outputs (see
1.0 for details). These models can be installed in
multiples to obtain a larger, combined output.
2.1 POOL CHEMISTRY
This heater uses a high performance cupro nickel
heat exchanger and are suitable for connection to
pools using chlorinated and salt chlorinated wa-
ter provided the following levels of chemicals are
maintained:-
pH 7.2 to 7.8
Alkalinity 100 to 150 ppm
Calcium Hardness 200 to 400 ppm
Salt concentration < 30,000ppm
Free Chlorines 1 to 4 ppm
Bromine 2 to 4 ppm
Chlorine < 150 ppm
All chemicals must be introduced and completely
diluted into the pool water before being circulated
through an operating heater. Do not place chlorine
tablets or bromine sticks in the skimmer, high chem-
ical concentrations will result when the pump is not
operating. Turn the heater off when shock dosing
Chlorinators must feed downstream of the heater &
have an anti-siphoning device to prevent chemical
back-up into the heater when the pump is shut off .
High chemical concentrates from feed-
ers and chlorinators that are out of
adjustment will cause corrosion to the
heat exchanger inside the heater. Such
damage is not covered under the war-
ranty.
2.2 CLEANING
It is recommended that periodically the casing is
cleaned and sprayed with WD40 or similar liquid,
and any exposed threads are lightly coated in
grease.
2.3 SERVICE & MAINTENANCE
It is recommended that the Heater is serviced
every 2000 hours of operation, or at least every
12 months. The display will alert when you when it
reaches this period by its display, ‘SEr’ alternating
with the temperature.
2.0 REQUIREMENTS
Side
vent
Si
v
e
Top
vent
End bolts

2.0 Requirements 8 Genie S
2.6 GAS SAFETY REGULATIONS
General
It is the law that all gas appliances are installed by
a competent person (e.g. a Gas Safe registered
engineer) in accordance with the Gas Safety Regu-
lations. Failure to install appliances correctly could
lead to prosecution.
It is in your own interest, and that of safety, to ensure
that the law is complied with. The installation of the
heater MUST also be in accordance with the cur-
rent I.E.T. Wiring Regulations, the Local Building
Regulations, Building Standards (Scotland), the Bye
Laws of the Local Water Undertaking, any relevant
requirements of the Local Authority.
Detailed recommendations are contained in the fol-
lowing British Standard Codes of Practice.
CODES OF PRACTICE
BS.6798 Installation of gas fi red hot water boilers of
rated input not exceeding 70kW.
BS.5440: Part1 and Part 2. Flues (for gas appliances
of rated input not exceeding 70kW).
BS 6891 Specifi cation for installation of low pressure
gas pipework.
BS5482:1 Code of practice for domestic butane &
propane gas burning installations.
Building Regulations Part L1.
IMPORTANT.
No external control devices should be directly con-
nected to this appliance - unless covered by these
‘Installation and Servicing Instructions’ or otherwise
recommended by the manufacturer. If in doubt,
please enquire.
Any direct connection of a control device not
recommended by the manufacturer could infringe
the Gas Safety (Installation & Use) Regulations, the
above regulations and the normal appliance war-
ranty.
Manufacturer’s notes must NOT be taken, in any
way, as overriding statutory obligations.
2.7 LOCATION OF HEATER
This heater MUST be installed on a fl at and level
fl oor, capable of adequately supporting the weight of
the heater and any ancillary equipment. Provision is
provided for the heater to be fi xed to the fl oor.
It is IP 44 Rated and can be installed out of doors in
a suitable position. In all cases the choice of position
should take into account the fl ue, the plume and the
condensate drainage.
IMPORTANT
If the heater is to be fi tted in a timber framed building
please refer to “IGE/UP7 Gas installations in timber
framed buildings” for guidance
The heater may be installed in any room or internal
space. Particular attention is drawn to the require-
ments of the current I.E.T. Wiring regulations (cur-
rently 18th edition)
Where installation will be in an unusual location
then please refer to the guidance given in “BS 6798
Specifi cation for selection, installation, inspection,
commissioning, servicing and maintenance of gas-
fi red boilers of rated input not exceeding 70kW”. De-
tails of essential features of cupboard compartment
design are also to be found in this standard.
Any compartment used to enclose this heater MUST
be designed and constructed specially for this pur-
pose. An existing cupboard, or compartment, may
be used provided it is modifi ed for the purpose.
In siting the heater, the following limitations MUST
be observed:
1. The position selected for installation MUST allow
adequate space for servicing in front of the boiler
and for air circulation around the boiler.
2. This position MUST also permit the provision of a
satisfactory balanced fl ue termination.
3. This position MUST also permit the provision of a
satisfactory connection to the condensate drain.

2.0 Requirements 9 Genie S
2.8 GAS SUPPLY
An existing meter and pipework should be checked,
preferably by the Gas Supplier, to ensure that they
are adequate to deal with the rate of gas supply
required.
Supply pipes should be sized to suit the installa-
tion and obtain a working pressure of 20 mbar (for
natural gas), 37 mbar (for propane) and 29 mbar (for
butane). Installation pipes should be fi tted in accord-
ance with BS.6891.
2.9 GAS CONVERSION
This heater is supplied setup for Natural Gas (G20)
It can be converted to LPG by the addition of an ori-
fi ce which is supplied with the heater (see 1.0 for the
setup data & 4.4 for conversion instructions).
2.10 FLUEING
Only fl ue components specifi ed by the manufacturer
should be used with these appliances. Detailed
recommendations for fl ueing are given in “BS.5440-
2 Flueing and ventilation for gas appliances of rated
input not exceeding 70kW”. The following notes are
intended for general guidance:
1. Be aware of the plume from the fl ue and the
wetting eff ect it can have to adjacent property
(refer to 3.2 & 3.3 for advice).
2. The fl ue can be taken upwards, left, right or to
the rear of the appliance, but never downwards.
3. This heater is supplied separate to the chosen
fl ue set. It can be fi tted with up to 20 metres
equivalent length of concentric fl ue (see 3.0 to
3.6 for advice and parts selection).
WARNING
It is absolutely ESSENTIAL to ensure in practice,
that the products of combustion discharging from the
terminal cannot re-enter the building, or any other
adjacent building, through ventilators, windows,
doors, other sources of natural air infi ltration or
forced ventilation/air conditioning.
If this should occur, the appliance MUST be
turned OFF IMMEDIATELY and a Gas Safe
engineer consulted.
2.11 AIR SUPPLY
It is NOT necessary to have a purpose provided air
vent in the room or internal space in which the boiler
is installed. Where the boiler is installed in a cup-
board or compartment no air vents are required.
However, it is recommended that the space is venti-
lated to provide air circulation around the heater.
2.12 OUTDOOR HEATERS
This heaters is suitable for outdoor installation, when
equipped with the approved terminal.
WARNING
Please note the following advise when locating a
heater outdoors:
• Do not locate this heater in an area where water
sprinklers, or other devices, may cause water to
spray through the cabinet openings and into the
inside of the heater.
• Do not locate this heater directly below roofi ng
overhangs (even guttered roofs) where there is a
potential for large fl ows of water to pour directly
onto the top of the heater.
Failure to follow the advice above could cause heavy in-
ternal rusting or damage some electrical components,
and this would void the warranty.
It is recommended that periodically the casing is
cleaned and sprayed with WD40 or similar liquid, and
any exposed threads are lightly coated in grease.

2.0 Requirements 10 Genie S
Fig. 1.0
2.13 FLUE TERMINAL POSITIONS
Minimum Distance mm
A Directly below an opening, air brick, opening window etc 300
B Above an opening, air brick, opening window etc 300
C Horizontally to an opening, air brick, opening window etc 300
D Below gutters, soil pipes or drainpipes 75*
E Below eaves 200
F Below a balcony or car port roof 200
G From vertical drain or soil pipe 150
H From an internal or external corner or to an alongside boundary 300
I Above ground, roof or balcony level 300
J From a surface or a boundary line facing a terminal 600
K From a terminal facing a terminal 1200
L From a opening in a carport (e.g. door, windows) into the building 1200
M Vertically from a terminal on the same wall 1500
N Horizontally from a terminal on the same wall 300
P From a roof structure N/A
Q Above the highest point of intersection on a roof 1200
Terminal adjacent to windows or opening on pitched and fl at roofs
The fl ue should not
penetrate the shaded
area
* Only if combustible material is protected. Otherwise a clearance of 600mm should be allowed.
Fig. 1.0a
Terminals should be so
positioned as to avoid
products of combustion
entering openings into
buildings or other flues or
vents
Source of data : Building regulations Part J : 2010 Gas appliances up to 70 kW

2.0 Requirements 11 Genie S
It is permissible to fi t an isolating valves on the pipe-
work on either side of the heater. In these circum-
stances it is recommended to fi t a fl ow switch in the
heaters mains supply.
2.16 ELECTRICITY SUPPLY
Wiring external to the appliance MUST be in accord-
ance with the current I.E.T. Wiring Regulations and
any Local Regulations that apply.
This heater is supplied with a plug and lead for 230V
~ 50Hz. Single phase. Fuse rating is 5A.
The method of connection to the mains electricity
supply MUST facilitate complete electrical isola-
tion of the heater, preferably by the use of a fused
double pole switch having a 3mm (1/8in.) contact
separation in both poles and servicing only the
heater and its controls.
The point of connection to the mains should be
readily accessible and adjacent to the heater.
2.14 CONDENSATE DRAIN
(see 3.9 for details)
A 75mm condensate trap is provided on this heater
and is satisfactory when connected to soakaways,
gullies, rainwater pipework and internal drainage
systems. All pipework and fi ttings in the condensate
drainage system MUST be made of plastic, unless
they carry other liquid waste. No other materials
may be used. The pipework should be insulated if
run out of doors.
The drain outlet on the boiler is :
40 mm Hunter waste pipe.
2.15 POOL PUMP & PIPE WORK
This heater is an indirect design and uses two very
high performance heat exchangers. The pool water
passes through the secondary, the water in the
primary is completely separate. This heaters con-
trols modulate the input when approaching the set
temperature for greater accuracy and economy. It
is recommended that pool pump overrun is used to
maximise the life of this heater.
If a new pump is being fi tted consult the pressure
loss graph (Fig 2.0) to determine its size. This
heater is provided with 1½” plastic pool connections.
As built the connections are ‘From Pool’ on the left,
‘To Pool’ on the right, however these can be easily
reversed.
With the exception of automatic dosing equipment,
this heater should be plumbed as the last piece of
equipment before the pool.
Fig. 2.0
Genie Resistance
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
0 50 100 150 200 250
l/m
m head

3.0 Installation 12 Genie S
Space required for installation and
servicing:
Left, right and above 300mm
Front 800mm
3.1 PROCEDURE
Site to suit the pool, terminal, plume and condensate
drain limitations. The terminal position should fol-
low BS 5440 and be at least 600mm away from any
opening or obstacle.
1. For an indoor installation only : Mark & drill
fl ue hole. (See 3.5 for dimensions)
2. Fix the heater to the fl oor using the holes pro-
vided in the front channel.
3. This heater is provided with a three pin plug and
lead. This can be connected to a suitable power
supply.
If it is required to operate this heater using an exter-
nal time clock follow the guidance below :
• Remove front top panel after releasing the re-
taining M5 screw under the lip.
• Remove the electrical Cover to access the
mains connector.
• Pull out the mains connector and replace the
mains lead and link wire with a permanent and
switched live supply (see 5.4). Pipe to the 22mm
gas connection.
5. Plumb to the pool pump and fi lter.
6. Fill primary system with water using the supplied
hose connector. This heater is supplied with one
litre of Sentinel X500 Inhibitor/ Anti-Freeze in the
pipework.
7. IMPORTANT. It is essentual that all air is re-
moved from the primary system through use of
the air vent on the right-hand side panel and the
vent on the top of the primary heat exchanger
(see 4.1 for details).
8. Test for leaks.
9. Replace the electrical cover and panels.
3.2 OUTDOOR TERMINAL
A specifi c outdoor top terminal must be used for an
outdoor installation. There must be at least 600mm
clearance around the terminal and complete clear-
ance above. The outdoor top terminal is a push fi t
into the fl ue adapter and locked in position with a
clamping ring. (See 3.2 for details)
If lubrication is required only Centra Cerin or
silicone grease should be used.
3.3 OTHER FLUE SYSTEMS (inc FEL)
The maximum Flue Equivalent Length (FEL) permit-
ted is 20 metres, horizontal or vertical. The compo-
nent parts have the following FELs:
1 metre of concentric fl ue 1.0
2 metres of concentric fl ue 2.0
A 45 degree concentric bend 1.1
A 90 degree concentric bend 1.5
A concentric Roof Terminal 3.3
A concentric Wall Terminal 3.9
Sum of the Flue Equivalent Lengths used in
the design must not exceed 20 metres.
All items assemble by a push fi t/clamp system. If it is
required to lubricate the seals only Centra Cerin sup-
plied by the manufacturer or silicone grease should
be used. The pipes should be assembled so the
socket end is always furthest from the heater. Flues
should be supported by brackets every metre of run.
Horizontal fl ues should incline back to the heater by 3
degrees (5mm in 100mm)
3.4 WALL TERMINAL
The horizontal wall terminal is supplied with two rub-
ber wall plates, one for inside and one for the outside.
The core drill diameter required is 175mm and should
incline upwards to the outside.
Because of the incline the height of the centre of the
fl ue hole on the wall is determined by the distance of
the heater from it. Calculate as follows:
1. Ensure service clearance is available.
2. Fit the 90 degree elbow to the heater and meas-
ure from its outlet face to the wall.
3. Add 5 mm for every 100 mm distance.
Example: Distance measured = 480 mm
(5 x 480) / 100 = 25 mm
Flue centre 1065 + 25 = 1090mm
If it is required to reduce the length of the terminal
the minimum overall length is 300mm. The fl ue duct
should be cut 10mm longer than the air duct.
Fig. 3.0
3.0 INSTALLATION OF HEATER

3.0 Installation 13 Genie S
3.5 HEATER DIMENSIONS
Pipe Connections
& Locations
Fig. 3.1
Dimensions
Model A B C
Genie 20 / 35 138mm 226mm 361mm
Genie 50 170mm 258mm 425mm D
E
Connections
D Multi Heater Connection
E Electric & External Control (CCP01)
F Gas Supply - 22mm Copper
G Safety Valve Outlet - 15mm Copper
H Condensate Drain - 1¼” or 40mm Hunter Plastic
I From Pool - 1½” Plastic Demountable Fittings
Fig. 3.2
Service Access
Left, Right or Above 300mm
In Front 800mm
Rear Flue Left/Right Flue
Horizontal Wall Terminal
Dimensions
Horizontal Wall Terminal
(MBHT)
F
G
H
I
940
980
374
78 90
773
134
253 (LH)
341
342
94
A
B
307
C
533
265 (RH)
SW WT
WT 136 188
93°
93°
1065 1065
52mm
1000mm
3°

3.0 Installation 14 Genie S
Outdoor Terminal
Dimensions
Fig. 3.3
Outdoor Flue Terminal
(MBOT)
Fig. 3.4
Clamp Assembly Screw
Pitched Roof Instal-
lation
Vertical Roof Terminal
Dimensions Flat Roof
Installation
Use Seldeck Flashing
System for all Roof
Installations
Vertical Roof Terminal
(MBVT)
1 metre Horizontal/
Vertical Extension Pipe
(MBHVE)
45 degree bends
(MB45DB)
550
500
500

3.0 Installation 15 Genie S
3.6 FLUE EXAMPLES
Flue Kit Part Codes
Type of Flue System
Kit Code Description Outdoor Kit Horizontal Terminal Vertical Terminal
MBHT Horizontal Wall Terminal n/a Yes n/a
MBHVE 1 metre Horizontal/Vertical Extension Pipe n/a Option Option
MBVT Vertical Roof Terminal n/a n/a Yes
MBOT Outdoor Terminal Yes n/a n/a
MB45DB 45 degree bend n/a Option Option
MB90DB 90 degree bend n/a Option n/a
Outdoor Terminal
Extended Horizontal
Wall Terminal
Extended Vertical
Roof Terminal
Horizontal Wall Terminal
MBOT
MB90DB
MBHVE
MBHT
(not shown)
TO OFFSET
USE MB45DB
)
MB90DB
MBHT
(not shown)
n
n)
n)
n)n)
n)
n)
n
)
)
n)
)
)
MBVT
MBHVE
TO OFFSET
USE MB45DB
SET
Fig.4.3
Fig.4.0
Fig.4.1
Fig.4.2
E
EEE
E
E
E
E
E
E
E
Determine the type of fl ue system you require and
choose from the list of kits available below:

3.0 Installation 16 Genie S
Flue Kit Part Codes (cont.)
Kit Code Description FEL Photo of Kit
MBHT Horizontal Wall Terminal 3.9m
MBHVE 1 metre Horiz./Vertical Extension Pipe 1.0m
MBVT Vertical Roof Terminal 3.3m
MBOT Outdoor Terminal n/a
MB45DB 45 degree bends (pair) 1.1m
MB90DB 90 degree bend 1.5m
Flue
Equivalent
Length (m)
The Maximum Flue Equivalent Length (FEL) permitted is 20 metres, horizontal or vertical. The fl ue kits available
below list the FEL for each component. Add up all the FEL’s used in your design and check that this does not
exceed 20 metres (see 3.3 for details).
(per bend)

3.0 Installation 17 Genie S
Pool pump fl ow rate
This heater has a very low resistance to pool water
fl ow and will tolerate a wide range of fl ows.
The minimum recommended fl ow is:
80 litres/min
3.9 CONDENSATE CONNECTION
The direction of the plastic condensate drain pipe
connection can be altered from the factory position
on the left, to the right.
• Remove the blanking plate from the right hand
side (See illustration in 3.5).
• Loosen the two screws holding the trap
bracket and swivel the trap through 90 degrees.
• Secure the bracket and fi t the supplied 40 mm
pipe.
• Example installations are shown on next page
• Fit blanking plate to the left hand side (See illus-
tration on next page).
Where possible an internal termination of the con-
densate discharge pipework should be used. If this is
not possible external pipes should be kept as short
as possible and insulated.
Where fi tted in pipework that includes another trap
or a pump, for example the fi lter backwash pipework
to drain, an air break should be fi tted between the
heater and that pipework. Avoid connecting to a
kitchen sink trap as the solids and fats in the drain
will cause a blockage.
It is permissible to connect to an external gully or
rain water hopper provided they connect to a com-
bined system. The condensate should not be run into
a ‘grey water’ recycle system.
If the condensate pipe is connected to a stack it
should join not less than 450 mm above the foot of
the stack. In addition it should be positioned so there
no chance of cross-fl ow to another connection.
Installation pipework must be in 40 mm Hunter
plastic pipe to a suitable drain location with a gradi-
ent of 2.5° (45mm/ metre run) minimum. If connected
to another drainage trap, an air break is required
between the heater drain and that trap (See illustra-
tion on next page).
Horizontal external pipework should be avoided if at
all possible. If not possible, the pipes should be insu-
lated or trace heated to help prevent the condense
liquid freezing.
Check during commissioning that there is a leak
free working connection from the heater to the drain.
The simplest way to do this is to carefully pour some
water into the boiler fl ue and check it emerges at the
drain. This will also fi ll the trap ready for operation.
3.7 TERMINAL GUARD & ROOF
TERMINAL
The fl ue outlet from this heater is low temperature
(normally below 60OC) so a guard is only required
if the terminal is in a position where it may be dam-
aged or blocked. A suitable guard is available from:
TFC Ltd. 01732 351555, Model DK6
The vertical roof terminal should be fi tted in a mini-
mum of 300mm clear unobstructed space. It is not
permitted to alter the construction of the terminal,
above the roof line, however the concentric section
below the roof line can be altered to suit the installa-
tion.
It is recommended that:
1. The Installation of the fl ues are completed before
connection to the heater. This will ensure that
any debris from the construction of the fl ue does
not enter the heater.
2. Whenever possible bends in vertical fl ues are 45
degrees.
3. Flues may be reduced in length by cutting. The
inner fl ue pipe should be cut so it is 5 to 10mm
longer than the outer Air duct. It will ease assem-
bly if the cut edges are cleaned, chamfered and
greased before assembly.
3.8 POOL WATER PLUMBING
The heater requires pool water to be fl owing to operate
and this is achieved via a pressure switch in the pool
water fl ow. It must therefore be installed downstream
of the fi lter and pump.
A typical installation is plumbed as follows:
1. The Pump outlet is plumbed to the inlet of the fi lter.
2. The outlet side of the fi lter is then plumbed to the
inlet of the heater.
3. The outlet of the heater is plumbed to the return
line to the pool or spa. The pump, fi lter and heater
are plumbed in series.
If it is necessary to install a valve on the return to the
pool then it is recommended that a fl ow switch is in-
stalled and interlocked with the heater supply.
The heater must be located so that any water leaks
will not damage the structure of adjacent area. The
heat shunt connections of the heater, can be made in
standard plastic 1½” pipe supplied demountable.
Use the pressure loss chart in 2.15 to specify a suit-
able pump.
Connection to the heater can be made from either
left to right, or right to left, it is supplied with the
‘From Pool’ connection on the left. To change, undo
the demount connection on the right, complete with
blanking plates, and swap with the connections on
the left. Ensure that the pool sensor is correctly posi-
tioned in its pocket after the change.

3.0 Installation 18 Genie S
3.9 CONDENSATE CONNECTIONS DISPOSAL METHODS
Condensate
Drain from
heater
Condensate Pressure
Switch Pipe
Connection
Connect To
Waste
(Option to
exit heater
left or right)
Drain Cap, (behind vessel)
can be removed for
Winterisation
D
CONDENSATE SYPHON (75 MM)
Fig.7.1
Removable Plate
(Use to close off
unused Waste exit
on panels)
R
(
1:20 Fall ( 2.5 Degrees )
Strap-On
Boss
200mm Land Drain
Filled with Lime
chippings 400mm
deep
Insulate against
freezing
Note: Do not reduce the pipe size below the 40mm provided.
Fig.7.0
Soakaway
Stack Attachment
Soil Pipe or
Drain

3.0 Installation 19 Genie S
3.10 ELECTRICAL CONNECTIONS
WARNING: The appliance
MUST be earthed.
All wiring for the heater and system controls MUST
conform to I.E.T. Wiring Regulations, and work
should be tested using a suitable meter, for Earth
Continuity, Polarity, Short Circuit and Resistance to
Earth.
The heater supply must be through a common iso-
lator, a double pole 5A fused isolating switch with a
contact separation of 3mm minimum on both poles.
The cable used should be no less than 0.75mm2 to
BS.6500 PVC, 3 core, and fi xed ensuring the earth
connection is longer than the Live and Neutral.
Access to the heater connections is made by the
removal of the front top panel and the electrical
chassis cover, two screws.
The simplest and most fl exible control scheme is to
use a Certikin CCP01 Control Unit. This provides an
electrical safety trip and timer with outputs for the
heater, lights and an auxiliary voltage free output. It
is pre-wired and tested and provided in a standard
IP55 plastic control box.
The heater’s internal wiring is illustrated in 5.4
Connections are as follows :-
4 Way Terminal Supply Connection
Earth
N Mains Neutral
SL Switched Live
L Permanent Live
A factory installed link has been fi tted between SL
and L which should be removed if the heater is to
have its own switched supply.
For systems using an external programmer, the
electrical wiring should follow the relevant control
manufacturer’s recommendations, with the switched
live from the controls returning to SL in the 4 way
push-fi t connector.
It is possible to connect several heaters together
using the multiple heater kit. Details for the parts
and installation of this kit are given in 3.13.
3.11 GAS CONNECTION
The 22mm copper gas connection provided can be
positioned to exit the heater on either the left or the
right hand side. A minimum of 19mb. (NG), 35mb
(propane) 26 mbar (butane) must be available at the
heater inlet, with the heater and other connected gas
appliances operating at nominal load.
NB: If the gas valve test point is used
there is a 2-2.5 mbar drop for the Genie
50 at full rate.
Check for gas tightness (B.S. 6891: 1988) in pipework
to boiler using a manometer. Gas leakage and sound-
ness within the heater should also be checked using
sense of smell and leak detection fl uid.
Inlet pressure
tapping

3.0 Installation 20 Genie S
3.12 WALL MOUNTING KIT
Overview
The Genie models can be wall hung using the wall
mounting kit.
Kit Part Code: MBWMK35/50
Instructions
• Select a suitable wall and position to mount the
heater. (Note the heater weighs up to 53kg).
• Screw the top wall mounting bracket level to the
wall (Fig 10.4).
• Attach the top handle bracket to the rear of the
heater by using the 3 M4 screws supplied (Fig
10.5).
• Attach the bottom wall mounting bracket to the
rear of the heater by using the existing 3 gold
screws that fi x the base to rear panel (Fig 10.5).
• Hang the heater on top wall mounting bracket
locating it on the two 5mm studs.
• With the heater now in position drill and screw
the bottom wall mounting bracket to the wall.
See (Fig 10.4)
Fig. 10.4
Fig. 10.3
476
376
940
170
46
HEATER
OUTLINE
TOP WALL
MOUNTING
BRACKET
HORIZONTAL
WALL
TERMINAL
CORE DRILL
POSITION
BOTTOM WALL
MOUNTING
BRACKET (FITTED TO
HEATER BEFORE
WALL HUNG)
FLOOR
DRILL HOLES AFTER
HEATER HAS BEEN
WALL HUNG
5MM STUD (2 PLC'S)
HEATER CABINET HEIGHT
HEATER CABINET WIDTH
80
REQUIRED CLEARANCE