Certikin COH110 User guide

Operating, Installation and Servicing Instructions for
Indirect oil red pool & spa heaters
M3491G
Models: COH110, COH180, COH220, COH280

COH Oil Pool Heater 1 GB, IE
HEALTH AND SAFETY
Information for the installer, user & service engineer
Certikin International takes every reasonable care to ensure that these products are designed and
constructed to meet current safety requirements, when properly used and installed. To full this
requirement products are comprehensively tested and examined before despatch.
When working on the appliance it is the Users/Engineers responsibility to ensure that any neces-
sary personal protective clothing or equipment is worn appropriate to parts that could be consid-
ered as being hazardous to health and safety. This appliance may contain some of the materials
below.
INSULATION & SEALS
Glass Rope, Mineral Wool, Insulation Pads, Ceramic Fibre, Fibre Glass Insulation: may be harmful
if inhaled and/or may be irritating to the skin, eyes, nose or throat. When handling avoid inhalation
and contact with the skin or eyes. Use (disposable) gloves, face masks and eye protection. After
handling wash hands and other exposed parts. When disposing, reduce dust with water spray,
ensure parts are securely wrapped.
KEROSENE & GAS OIL FUELS (MINERAL OILS)
1. Avoid as far as possible any skin contact with mineral oil or clothing contaminated with mineral oil.
2. Skin rashes (oil Acne). Seek immediate medical attention for any rash, wart or sore developing
on any part of the body, particularly the scrotum.
3. Never breath any mineral oil vapours. Do not operate the burner in the open (i.e. out of the heater)
as a misre will cause unburnt oil vapours.
4. Barrier cream containing lanolin such as Rosalex Antisolv, is highly recommended together with
a strict routine of personal cleansing.
5. Under no circumstances should mineral oils be taken internally.
OFTEC Code of Practice OCP/1: For the Safe Installation, Commissioning, Maintenance and
Fault Rectication of Oil Firing Equipment should be consulted.
Due to a policy of continual development the manufacturer reserves the right to alter or amend the
design of its products without prior notice.
WARNING: If the information in these instructions are not followed exactly, a re or
explosion may result causing property damage, personal injury or death.
Do not store or use gasoline or other ammable vapors and liquids in the vicinity of this or
any other appliance.
THIS APPLIANCE MUST BE INSTALLED:-
• By a competent person.
• In accordance with the rules in force.
• in accordance with these operating, installation and servicing instructions.
• In open air or in a room which is separated from living rooms and provided with ap-
propriate ventilation directly to the outside.
READ THESE INSTRUCTIONS BEFORE INSTALLING AND OPERATING THIS APPLIANCE

COH Oil Pool Heater 2 GB, IE
SECTION 1 - USER INSTRUCTIONS
1:1 Safety Notes
1:2 Air Supply
1:3 Connections
1:4 Installation & Commissioning
1:5 Quick Start
1:6 Summary of Controls
1:7 Re-pressurising
1:8 Running the Pool Pump
1:9 Switching o󰀨, temporarily
1:10 Switching o󰀨 for the winter
1:11 Oil delivery
1:12 Maintenance
1:13 Trouble shooting
1:14 Service
1:15 Water Quality
SECTION 2 - GENERAL INFORMATION
2:1 Introduction
2:2 Flue Options
2:3 Commissioning
2:4 Safety
SECTION 3 - TECHNICAL DATA
3:1 Liquid Fuels
3:2 Heater Technical Details
3:3 Burner Details
3:4 Electrics
3:5 Dimensions
3:6 Commissioning Data
SECTION 4 - INSTALLATION
4:1 Standards and Regulations
4:2 Heater Controls
4:3 Installation Wiring
4:4 If combined with heating
4:5 Siting & Positioning
4:6 The Hearth
4:7 Oil Storage
4:8 Oil Supply
4:9 Oil Burner
4:10 Sensor positions
4:11 Wiring Diagrams
SECTION 5 - FLUES
5:1 Conventional Flues
5:2 Air Supply
5:3 Balanced Flue Heaters
5:4 Balanced Flue Terminals
5:5 Terminal Guards
5:6 Positioning the Heater
SECTION 6 - BALANCED FLUE INSTAL-
LATION
6:1 Horizontal Balanced Flues
6:2 Vertical Balanced Flues
6:3 Outdoor Flue Kits
SECTION 7 - COMMISSIONING
7:1 General Information
7:2 Filling the Heater
7:3 Setting up the Controls
7:4 Pressure Switch
7:5 Responsibility
7:6 Reporting
7:7 Commissioning Check List
7:8 Commissioning Tests
SECTION 8 - MAINTENANCE
8:1 Maintenance
8:2 Air Shutter Adjustment
8:3 Ba󰀪e Arrangement
SECTION 9 - SPARES & ACCESSORIES
9:1 Spare Parts
9:2 Accessories
9:3 Burner Parts
SECTION 10 - FAULT FINDING
10:1 General
10:2 Control Fault Diagnosis
10:3 Fault Finding Chart
CONTENTS

COH Oil Pool Heater 3 GB, IE
1: USER INSTRUCTIONS
1:1 Important Safety Notes
To obtain the best possible performance and trouble
free operation from your heater, it is important that
you read these instructions carefully. Your pool heater
has built-in safety features, which are detailed in the
relevant section of this manual.
Please note: It is essential in the interest of the heater
efficiency and reliable performance that once the
heater has been installed it is rst commissioned by an
OFTEC.* registered engineer. It is the responsibility of
the installer to ensure that the heater is commissioned.
If it is known or suspected that a fault exists on the
Heater, it MUST NOT be used until the fault has been
corrected by a competent engineer (see Section 1:13,
Trouble Shooting - Failure to Start)
It is essential that these instructions are strictly
followed for safe and economic operation. Failure to
observe these instructions may invalidate your right
to free breakdown cover during the guarantee period.
As this an oil burner appliance some parts will become
very hot and so care must be taken.
We recommend that you keep these instructions in a
place near your Heater for easy reference.
1:2 Air Supply to Heater - Conventional
Flue
Where your Heater is used on an open conventional
ue system, a permanent air supply is required for
combustion. Clearances provided for air entry at the
rear of the appliance and into the building in which it is
installed, must be kept free of obstruction. For further
explanation please refer to section 5:1 and 5:2.
1:3 Connections
Your Heater should be connected to an electrical sup-
ply complying with the Electrical Wiring Regulations
(BS7671): as well as an oil supply complying with
BS541; and an appropriate ue system.
ALWAYS SWITCH OFF THE ELECTRICAL SUP-
PLY before removing any of the covers for cleaning.
If any part of the Heater or its ue has been modied
without the manufacturers approval, the guarantee
will be invalidated.
1:4 Installation & Commissioning
After your Heater has been installed it MUST be
commissioned preferably by an OFTEC*. Registered
installer, or by one of our recommended service
engineers. Commissioning involves testing the Heater
to ensure that it is working correctly, and also set-
ting the Burner correctly to ensure the most e󰀩cient
operation and use of fuel. If the Heater has not been
commissioned, it may not be operating at the maxi-
mum e󰀩ciency possible, and may also invalidate the
guarantee.
*The Oil Firing Technical Association Ltd 01473 626298
1:5 Quick Start
Check the Electricity and Oil supplies to the Heater
are on. If the Pool Pump is not controlled by the
Heater, turn it on. Turn on the Heater by turning the
Pool Temperature Control Knob clockwise to show
the required Pool temperature, the Heater will re.
If the Heater fails to light see Section 1:13, Trouble
Shooting - Failure to Start)
1:6 Summary of Controls (left to right)
Heater Pressure Gauge
Normal - The needle should be in the area indicated
as * * NORMAL * * , if low, re-pressurise, see Section
1:7
Pool Demand LED - GREEN
O - There is no Pool Heating Demand , pool heating
is o󰀨.
On -There is a Pool Heating Demand the pool is not
yet up to temperature.
Flashing - The Pool Heating Demand is Met , the
pool is up to temperature.

COH Oil Pool Heater 4 GB, IE
Pool / Spa Temperature Control Knob
16°C to 41°C (60°F to 106°F)
O󰀨 - There is no Pool Heating Demand , pool heating
is o󰀨.
Pump - Runs Pool Pump only, if connected via
heater. ‘P’ is indicated on Pool Temperature Display.
- Pool + - Setting for pool temperatures. Requested
temperature is displayed when setting, actual Pool
Temperature is displayed after 3 seconds.
- Spa + - Setting for Spa Temperatures. Required
temperature is displayed when setting, actual Spa
Temperature displayed after 3 seconds.
(NOTE: The Heater is delivered set to display in
Fahrenheit. For a Centigrade display, see 7:3 Com-
missioning Section of Installation Instructions)
Pool Temperature Mechanical Stop
Stop – This can be used to obtain a repeatable set-
ting and to limit maximum pool temperature. To set,
loosen the screw, adjust as required and then re-
tighten.
Pool Temperature Display
Display - Normally shows the actual Pool Tempera-
ture, but also displays the Setting Temperature and
a Setting Dot lit whilst being adjusted. The display is
also used for commissioning and diagnostic pur-
poses.
Heating Demand LED - GREEN
(Only in use when heating system connected)
O - There is no Heating Demand , heating is
switched o󰀨.
On - There is a Heating Demand, heating is on but
not yet up to temperature.
Flashing - The Heating Demand is met , heating is
up to temperature.
Heating Temperature Control Knob (60 - 80oC)
(Only used when heating system connected)
O - There is no Heating Demand, heating is
switched o󰀨.
Normal - Normal setting for heating, it can be ad-
justed lower if required.
(NOTE: Supplied set for Pool Priority. It will satisfy
the Pool Temperature before supplying full Heating.
To change the priority, see 7:3 Commissioning Sec-
tion of the Installation Instructions)
Filter LED - YELLOW
On - Pool lter blocked - Insu󰀩cient pressure, pos-
sibly due to a blocked pool lter. The heater will not
run.
Flashing - Clean pool lter - The lter may require
back washing. The heater will run. Can be reset by
turning the pool temperature knob o󰀨 and back on
again.
Lockout - Oil? LED - RED
On - Lockout - Oil? - This indicates that the burner
cannot re, the probable cause is lack of fuel oil.
Check the oil tank. After 3 minutes press the But-
ton on the front of the burner to reset. If the problem
persists consult your service engineer.
Heater Overheat LED - RED
On - Heater Overheat - This indicates that the
Heater has overheated and shut down. See Press to
Reset Button instructions below.
Press to Reset Button
Press Reset Button when heater has cooled down. If
the problem persists consult a service engineer.
Automatic Frost Protection
Will operate in any control mode (except completely
powered o󰀨). Activated if the heater temperature
falls below 3oC (37oF). The burner and internal pump
are turned on (pool pump is turned o󰀨) until the
heater temperature rises above 10oC, when normal
operation will resume.
1:7 Re-Pressurising
Connect a Mains Water supply then connect the free
end of the braided exible hose (the Filling Loop)
(see Fig.2:1b) to the incoming mains connector.
Open the Valve to the supply, then, slowly open the
Valve on the Side Panel until the Pressure Gauge
shows 1 Bar.
Close both valves then disconnect the Filling Loop.
1:8 Running the Pool Pump
If this option has been installed the Heater can run
the Pool Pump on its own. Turn the Pool Tempera-
ture Control Knob to ‘Pump’, just next to O󰀨.

COH Oil Pool Heater 5 GB, IE
Fig 2:1b
Oil Filter
& line
Cold water
Mains inlet
Safety Outlet
From Pool
COH180 & COH220
Burner Lockout
Reset
Stop cock
1:9 Switching the Heater Off -
temporarily
The heater may be stopped by turning the Pool
Temperature Control Knob and/or the Heating Tem-
perature Control Knob to OFF on Control Panel.
Alternatively, the Heater may be stopped by turning
o󰀨 the mains switch controlling the Heater.
1:10 Switching off for the Winter
Turn both temperature control knobs to o󰀨. If the
built in frost protection is required, do not isolate the
heater from its electrical or oil supply.
If the heater is to be shut o󰀨 for the Winter, it is
advisable to have it thoroughly serviced when rst
shut down. Thorough cleaning will minimise corro-
sion during the idle period. Remember, when the
heater is required, to ensure that the oil supply is
open before switching on.
1:11 Oil Delivery
Always ensure the tank is topped up at regular in-
tervals rather than wait till it is nearly empty. This
will avoid tank deposits and water being sucked in
to the burner.
Where possible, it is advisable to temporarily switch
the heater o󰀨, and to keep it o󰀨 for one hour after the
delivery. This is to allow any sediment to settle and
not be drawn into the heater. Failure to do this could
result in a blockage of the oil burner nozzle.
Please ask your supplier, or the driver to notify you
before the oil is discharged.

COH Oil Pool Heater 6 GB, IE
1:14 Servicing
To ensure e󰀩cient and reliable operation of the
Heater it is essential that the oil burner is initially
commissioned by a qualied engineer, and that an
annual service is given thereafter by an OFTEC
trained and registered engineer.
1:15 Water Quality
Chemical imbalance can cause severe damage to
your Heater and associated equipment.
Maintain the water pH between 7.4 and 7.6 and
ensure that the free chlorine levels are within the
range recommended by the chemicals manufacturer
for your size of pool.
Check the lter regularly and keep the pool free of
debris such as leaves and grass cuttings.
1:12 Maintenance
For normal cleaning of the outside casing, simply wipe
with a dry cloth. To remove stubborn marks and stains,
wipe with a damp cloth and nish o󰀨 with a dry cloth. DO
NOT use abrasive cleaning materials. A spray of WD40
or similar will also help to protect it.
The Heater must be serviced at regular intervals by a
qualied service engineer. Failure to have the Heater
serviced at the recommended intervals will invalidate
the guarantee.
If using Kerosine Class C2 fuel, the Heater should be
serviced at twelve monthly intervals.
If using Gas Oil Class D fuel, the Heater should be
serviced at six monthly intervals.
All air intakes must remain clear at all times and so it
is advisable to inspect and clean these areas regularly.
Please refer to 4:6 later in this Installation manual for
further explanation.
1:13 Trouble Shooting - Failure to Start
If the Burner fails to start, adopt the following procedure:-
1. Check that there is oil in the tank and that the supply
valve is open.
2. Check that the Pool pump is operating and that the
Filter lamp is not illuminated.
3. Check that the Heater Control Thermostat is set high
enough to be “ON” and that the Pool Demand lamp
is on.
4. Check whether the Heater overheat light on the
control fascia is glowing, if so it indicates an overheat
situation. Press the reset button once the tempera-
ture has dropped su󰀩ciently.
5. Check whether the red Lockout indicator on the
Control Panel and Burner Control box are glowing.
This indicates that the Burner has attempted to start
but has not red successfully. Press the reset button
on the Control box, when released, the lights will go
out and the Burner will again attempt to start. If the
Burner does not run and again goes to lockout with
red indicators glowing:-
· Wait three minutes.
· Repeat the procedure by pressing the button.
· Failure to start on the second attempt indicates a fault
requiring attention.
· Switch o󰀨 the mains supply and call your service
engineer.

COH Oil Pool Heater 7 GB, IE
2: GENERAL INFORMATION
2:1 INTRODUCTION
This Manual covers Operation, Installation, Commis-
sioning and Maintenance of the Oil Fired Pool Heat-
ers.
The Pool Heaters are :-
· Designed for heating pools and spas by utilising an
internal water to water heat exchanger.
· Incorporates its own sealed system
components; pressure vessel, lling loop, safety
valve, and pressure gauge.
· Can also be used for space heating.
· Supplied with a manual reset limit thermostat.
· Suitable for new installations and for replacing
existing Heaters.
· Include an internal thermostatic bypass to maxim-
ise the life of the heat exchanger.
All models are supplied as standard with a low level
horizontal ring Oil Burner suitable for connection to a
conventional ue.
Note: The nozzle on this appliance is only covered by
a 1 year guarantee.
2:2 FLUE OPTIONS
The Heaters are designed to operate with high e󰀩-
ciency compliant with Section L of the Building Regu-
lations, clean combustion, and low noise levels.
Choice of ue systems are as follows:
· For connection to a conventional ue.
· Low level balanced ue, left, right or rear.
· Outdoor.
· Vertical Balanced ue.
See Section 9:2 for parts/accessories detail.
The tested balanced ue terminal and connection
a󰀨ords an adequate supply of air for combustion and
equalisation of pressure between exhaust and intake
as required for operation under unfavourable wind
conditions.
Balanced ues are supplied in a carton that includes
ALL parts for a balanced ue installation.
The horizontal terminals are designed to avoid the
possibility of staining outer walls through which they
pass.
2:3 COMMISSIONING
It is essential in the interest of Heater e󰀩ciency and
reliable performance that once the Heater has been
installed it is rst commissioned by a qualied engi-
neer.
If an engineer is not known, The Manufacturer will be
pleased to provide details of an OFTEC*
approved commissioning and servicing engineer from
their list of approved engineers.
See Section 7 for Commissioning Procedure.
It is the responsibility of the Installer
to ensure that the Heater is
commissioned by an OFTEC*
Registered Commissioning Engineer.
*The Oil Firing Technical Association, Ipswich,
IP5 2QQ Tel: [phone].
2:4 SAFETY
Should you wish to remove or
dismantle any covers or parts of the
Heater for cleaning or maintenance
ALWAYS FIRST SWITCH OFF THE
ELECTRICITY SUPPLY.
1. On no account should any part of the Heater or its
Flue be modied.
2. The wiring of the control panel should be as the
wiring diagrams included in this Manual. Wiring
should not be tampered with, modied or changed
for any reason.
3. Only use The Manufacturer’s replacement parts.
Noncompliance with the above will invalidate the
Guarantee.

COH Oil Pool Heater 8 GB, IE
3: TECHNICAL DATA
3:1 LIQUID FUELS
The Pool Heaters will burn liquid fuels complying with
BS2869 Part 2 1988 Classes C2 and D as specied
in the Code of Practice for Oil Firing BS5410 Part 1.
Heating Oil (Kerosine), also known as 28 sec oil
This fuel is suitable for all models. Burners are sup-
plied with the appropriate nozzle and pump pressure
as standard for this fuel.
They are set for the stated output. Details of all nozzle
sizes and pump pressure for all Heaters are shown on
the following pages.
Gas Oil (Red Diesel), also known as 35 sec oil
All models, can be adapted to burn Gas Oil. The
adaptation requires the alterations as detailed in the
data table 3:6.2.
The use of Class D (Gas Oil) for low level discharge
of combustion gases is NOT permitted under any
circumstances.
(Ref: OFTEC Technical Book 1).
3:2 HEATER TECHNICAL DETAILS
Maximum Heater working pressure 3 Bar (Class 2)
30.6m Water Head
Maximum hearth temperature less than 85°C
Maximum side panel temperature above room. less than 35°C
Minimum Conventional ue draught at Heater ue outlet 0.035”w.g. (8.75N/m²).
Maximum Conventional ue draught at Heater ue outlet 0.15”w.g. (37.5N/m²).
Water Resistance with 11°C temperature rise across the Heater 0.3m (1ft) wg
Recommended Filling Pressure 1 bar
Expansion Vessel 4 litres,
pre-charge pressure 1 bar
Fuses Heater 5 Amp
Control 250mA Anti-surge glass LRC
Pool Pump Output, maximum 3 Amp, 230V
3:3 BURNER DETAILS
Burner - Riello 40, 443T58, 459T55, 464T55. and RDB3 489T50
Manually adjustable air regulator. For further details of the burners, refer to the data sheets supplied in the
literature pack.
3:4 ELECTRICS
Electrical Supply 230v., 1 Ph., 50Hz.
All wiring to the supply and all system components external to Heater must comply with the latest edition of IEE
Wiring Regulations. This appliance must be e󰀨ectively earthed and connection to the supply must be through
a double pole isolating switch.
Note: Pool Heaters with Outdoor Flue Kits.
IMPORTANT: THE OIL POOL HEATER IS SUPPLIED WITH A 13 AMP PLUG, THIS SHOULD NOT BE
USED OUTDOORS. ENSURE POWER SUPPLY IS IN ACCORDANCE WITH I.E.T. REGULATIONS AND
ANY LOCAL REGULATIONS WHICH APPLY.

COH Oil Pool Heater 9 GB, IE
3:5 DIMENSIONS
Height Depth Widths Service Clearances
Model A B C D Flue F G H Internal Pool Water Weight
mm mm mm mm Dia. mm mm mm Pump Connection Content Empty kg
* Speed mm litres
110 860 700 470 127 100 750 500 500 1 38 30 130
180 1000 725 510 169 125 750 500 500 2 38 38 190
220 1000 725 510 169 125 750 500 500 3 38 38 190
280 1100 870 590 191 150 750 500 500 *3/**N/A 38 59 310
*WILO standard eciency (with speed adjuster) ** WILO High eciency (xed speed)
3:6 COMMISSIONING DATA
3:6.1 Class C2 Heating Oil (Kerosine), also known as 28 sec oil
Fig 3:5a
B
D
F
GCH
A
Flue
Centre Line
Model Output Burner Pump Air Firing CO² % Smoke Flue Gas
Nozzle Pressure Shutter Rate l/h +/- 0.5%
US-GPH (kg/h) Approx
kW Btu/h Type Head x Angle Bar psi
TempºC
x 1000 Setting
Gross
110 26.4 90 443T58 Fixed 0.85 (3.31)x60W 7.2 105 2.9 2.32 11.5 0 - 1 200
180 44.0 150 459T55 0 1.35 (5.17)x60W 8.3 120 2.6 4.04 11.5 0 - 1 220
220 51.0 175 468T55 2 1.75 (6.55)x60W 6.9 100 4.5 5.00 11.5 0 -1 240
280 70.0 239 490T51 2 2.25 (8.35)x60W 7.6 110 8.5 6.53 11.5 0 -1 250