Non-Hazardous Air and Immersion heater
THE USER SHOULD NOTE THAT THESE ARE ABRIDGED INSTRUCTIONS. FOR FULL DETAILS, REFER TO THE
CONTRACT SPECIFIC INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS SUPPLIED FOR THE
EQUIPMENT.
IF IN DOUBT, CONTACT TP Fay (KIRKBY) LTD, WITH DETAILS, AS PER SECTION 1.
Prior to placing the equipment into service, the installer should provide language translation of the Installation,
Operation & Maintenance Manual as applicable, such that these instructions are available in the language
representative of the end user.
1. Contact Details
2. Safety
3. Preservation and Storage Instructions
4. Erection and Installation Instructions
5. Pre-Commissioning / Commissioning Instructions
6. Operating Instructions
7. Maintenance Instructions
– Heater
8. Fault Finding and Correction
– Air Heater
– Immersion Heater
9. Specification
– Customer Requirement
– Design Criteria
– Materials
– Power Requirements
– Operation Instructions
– Wiring Diagram
– Assembly Drawings
– Component Drawings
Appendix B – Installation, Commissioning and Maintenance Schedule
(ICMS)
SECTION 1. Contact Details
TPFay (KIRKBY) LTD
55-65 ADMIN ROAD
KNOWSLEY INDUSTRIAL PARK
LIVERPOOL
MERSEYSIDE
L33 7TX
Telephone 03703 50 50 58
Fax 03703 50 50 59
info@tpfay.co.uk
Contact
Service / Spares:
Email: sales@tpfay.co.uk
TPFay (Kirkby) Ltd has a team of fully trained engineers who can offer a specialist inspection and maintenance
service for equipment they manufacture.
For further details, please contact our service department.
SECTION 2. SAFETY
This section is in addition to specific safety requirements detailed elsewhere in this manual.
General
Electrical equipment must be designed, tested and installed such that, when properly used, health and safety
risks are kept to a minimum. Information must be provided to advise the user of any necessary safety conditions
and warn of any possible hazards that may arise during normal operation and how to avoid them.
The user must ensure that his employees are fully trained and supervised in the proper working procedures in
order to ensure their safety. The plant must be maintained in a safe condition.
Provided the above conditions are adhered to, the equipment should be safe for use under normal operating
conditions.
When it becomes necessary for authorised and competent persons to carry out maintenance, testing or setting
up to work on the equipment requiring internal access by opening doors or removing covers, safety hazards may
arise. In most of these cases the equipment cannot be completely isolated before working on it.
As it is virtually impossible to achieve conditions, which are completely hazard free when working on energised
circuits, responsibility for safe conduct of the competent person or persons operating on the equipment rests
with those under whose authority they act.
Where the Pressure Equipment Directive (97/23/EC) applies, the Essential Safety Requirements as stipulated in
Appendix 39; of the contract specific Installation, Operation and Maintenance Instructions shall be complied with.
Installation
Ensure that the equipment is correctly installed in a suitable location by technically qualified and competent
persons.
Before operating the equipment, the installation should be approved by a supervisor to ensure that the system is
safe for operation.
It is the responsibility of the purchaser of the equipment to ensure that safe systems of work are adopted for all
personnel operating and maintaining the equipment including testing when ‘live’.
The purchaser should comply with any instructions and information provided in this manual and on the drawings
supplied.
Normal Use
The following notes provide a guide to minimise the risk of accidents to personnel when using electrical
equipment: –
Ensure that all persons operating the equipment are fully trained. This must include training in
procedures for emergency shutdown.
Operators should be trained to recognise signs of maloperation of the equipment and be familiar with
the actions to be taken in these circumstances.
Maintain all control cubicle doors closed and locked whilst the equipment is in operation and comply
with any safety warning notices.
Access to keys for control cubicle doors should be restricted to competent authorised personnel and
issued to them only as part of a written safe system of work which provides for isolation of electrical
supplies before doors are unlocked and for verification of the doors being locked before restoration of
supplies for normal operation of equipment.
The user must ensure that safety interlocks are provided and maintained to ensure that the heater may only be
energised when the design flow rate through the heater is attained and that the heater is de-energised should
this flow rate be reduced or stopped.
Maintenance and Testing
The purchaser must ensure that maintenance, setting up and testing of the equipment is only carried out by
authorised and competent persons.
The following rules must be adhered to:-
Before commencing maintenance work, isolate the equipment completely whenever possible.
Comply with safe working conditions.
Do not work alone on the equipment when energised.
Be aware of hazards which may arise when work is being carried out on energised equipment and take
all precautions necessary.
Familiarise all persons working on the equipment with instructions and information provided in this
manual.
Providing that the equipment is functioning correctly and all personnel responsible for operating it are complying
with the conditions specified, the electrical equipment may be deemed to be ‘properly used’.
SECTION 3. PRESERVATION AND STORAGE INSTRUCTIONS
Where the equipment has been supplied suitably packed for short term storage:-
On receipt of the equipment into the storage area, examine the equipment against the packing list to check that
the quantity received and its identity is complete.
Examine all the equipment for any damage that may have occurred in transit. Any damage must be logged and
reported to the site manager and subsequently to TPFay (Kirkby) Ltd within 7 days of receipt of goods.
Unless otherwise agreed, the equipment should be stored in an inside location that is dry, clean and well
ventilated.
Ensure that equipment is not stacked and observe any “This Way Up” markings.
Especially in areas of high humidity, the following preservation instructions must be adhered to:
1. The storage period must not exceed 3 months
2. The equipment should remain in its original sealed packaging until required for installation.
3. Where provided, anti-condensation heaters should be temporarily energised during storage and prior to
installation. These must be disconnected following the equipment being put into full operation.
4. Should it be necessary to open the packing / heater terminal box, for example to cable in an anti-
condensation heater. The terminal box lid must be replaced immediately after the work has been
carried out, and the packaging re-sealed.
N.B. The equipment warranty could be invalidated if the above is not adhered to.
All design lifting points must be used whenever moving equipment from one area to another.
Caution: Where lifting eyes, are fitted in the tubesheet of immersion heater bundles, these are designed for
supporting the bundle only during removal and re-fitting in conjunction with slings; not the combination weight of
fitted heater in vessel.
Care must be taken at all times to ensure safe movement and that no out of balance occurs during movement.
Ensure equipment is stored in a proper manner to minimise the risk of accidental damage.
Monthly inspections of the equipment during storage are to be made by the erection contractor to detect any
signs of deterioration, check on limitations of time in storage, ensure maintenance of proper conditions and to
determine the current state of materials.
Upon completion of periodic inspections, the ICMS form as per Appendix B of this manual should be completed.
Additionally, should it be necessary to enter the main heater terminal box, the VCI pads or similar should be
replaced and the preservation record (found within the main heater terminal box) completed accordingly.
Where the equipment has been supplied suitably packed for long term storage:-
Additionally, to the above:
1. The storage period must not exceed 12 months.
2. Moisture indicators, where fitted to the packaging, should be checked every 3 months and the VCI pads
or similar replaced as required and packaging resealed.
N.B. The equipment warranty could be invalidated if the above is not adhered to.
SECTION 4. ERECTION AND INSTALLATION INSTRUCTIONS
Scope of Work
This section covers the erection and installation requirements for the TPFay (Kirkby) Ltd range electric heaters,
for use in a non-hazardous area.
Reference should be made to the relevant code of practice for selection, installation and maintenance of
electrical apparatus for use in potentially explosive atmospheres.
Note: A completed ICMS or equivalent will be required in the event of any safety or warranty claim.
Extent of Equipment to be erected / installed
Responsibilities
This section outlines the erection contractor’s responsibility for the erection and installation of the equipment
supplied under this contract.
The equipment shall be installed by the erection contractor under the surveillance of the client’s site engineers,
in accordance with these instructions.
The installation shall be carried out in complete accordance with this document, which shall be read as
complimentary to all associated contract documents (such as site conditions, contract specifications and
drawings) and national legislation / regulations.
The erection contractor shall ensure that his employees are fully trained and supervised in the appropriate site
working procedures in order to ensure their safety. The site must always be maintained in a safe condition .
The erection contractor shall ensure that his site installation personnel are issued with copies of all relevant
drawings, material schedules and specifications to enable him to fulfil his obligations.
The erection contractor shall be responsible for providing all tools and equipment necessary to carry out the
installation as required on the schedule drawings.
Equipment Erection
Inspection of the Equipment Prior to Installation.
Before installation, the equipment must be inspected to ensure that all items are available and that all crates
and/or packaging are in good condition and undamaged. Any damages must be reported to the site manager and
subsequently to TPFay (Kirkby) Ltd.
Heater Installation
Ensure that the equipment is correctly moved and installed by technically qualified and competent persons
experienced in the class of work involved.
Before moving the equipment, carefully remove packaging from each item and check for damage. Any damage
must be reported to the site construction manager immediately and subsequently to TPFay (Kirkby) Ltd.
Before installation, the insulation resistance of the heating elements should be checked. This can be carried out
by taking a reading between the element sheath and the phase terminals using a 500v DC megohmeter. A
reading better than 2 megohm should be obtained. If the readings are lower than this, contact TPFay (Kirkby) Ltd
for advice – see Leading Particulars for contact details.
Move the equipment by either crane or fork lift truck using suitable lifting chains / slings to prevent
damage to the heating elements, observing the following safety points: –
All lifting tackle / equipment must have a safe working load (SWL) capacity in excess of that of the
equipment weight and include for snatch factors etc.
The slings or ropes must have sufficient length to keep the angle between the slings / ropes and the top
of the equipment greater than 45°.
Too short a sling / rope will reduce this angle and so lead to unacceptably high stresses on the eyebolts /
lifting lugs.
Certain equipment configurations may require a lifting beam to achieve a safe lift.
Additional support should be provided, as necessary, when lifting, to counteract any out of balance that
may be present.
The swinging of the suspended load must be prevented and / or eased by suitable means.
Caution: Where lifting eyes, are fitted in the tubesheet of immersion heater bundles, these are designed for
supporting the bundle only during removal and re-fitting in conjunction with slings; not the combination weight of
fitted heater in vessel. The same is true where lifting points are provided on the terminal boxes of air duct heaters
– use these for bundle lift only. Package lift should be made via the lift points on the duct section
Forklift arms should be spaced as far as the configuration of the equipment allows and be long enough
to go completely under the equipment.
Move equipment by forklift truck only as far as is absolutely necessary, particularly at the assembly site
and on uneven ground.
Preference should be given to crane handling whenever possible.
The load should be set down carefully and without bumping, ensuring that destination position is free
from obstructions.
Move the equipment into position and check alignment prior to bolting in position.
In the case of non-installed immersion heater bundles, the gasket face should be inspected prior to installation
and any damages reported to the site manager and subsequently to TPFay (Kirkby) Ltd.
It is the installation contractor’s responsibility to ensure that the equipment is suitably supported both internally
and externally and not subjected to undue stress or vibration.
For a heater bundle supplied without housing, adequate support of the immersed part must be provided within
the respective vessel, tank, or duct.
Ensure that there is sufficient room around the heater to remove the heater bundle for maintenance.
Each heater is fitted with safety devices as detailed on the supplied contract drawings. It is a mandatory
requirement that they are in good working order and connected into the dedicated trip system as stated on the
schedule drawings.
Safety interlocks must be installed to ensure that the heater may only be energised when the design flow rate
through the heater is attained and that the heater is de-energised should this flow rate be reduced or stopped.
Ensure that the supply cable is of the correct type and is sized for the current being carried. Maximum ambient
temperatures, cable routing method and volt drops due to cable runs must also be considered.
Ensure that the supply cables are suitably supported to prevent undue force / stress on the terminal points.
Check that the voltage on the heater nameplate is compatible with the mains supply being used.
Under no circumstances should any TPFay internal cabling or connections be interfered with.
This includes cable re-routing and ‘bunching’ thereof, which can have a serious adverse effect on the heat build-
up generated within the terminal enclosure.
Terminal Points
The terminal points for each heater are as follows: –
i. Power terminals and cable gland plates (or cable entries) for heater power supply.
ii. Control terminals and cable gland plates (or cable entries) for heater trip/alarms.
iii. Equipment earth terminals.
Ensure that the equipment is earthed in accordance with the plant earthing philosophy.
The heater should be protected by a suitable earth leakage protection system, with a maximum trip response
time of 10 milliseconds, wired to shut down the heater in the event of heating element failure to earth.
Before commissioning the equipment, the completed installation should be approved by a qualified supervisor to
ensure that it has been carried out correctly and that the system is safe for commissioning.
Heaters must only be immersed in the fluid they are designed to heat.
The introduction of alternative fluids even in small concentrations for purposes such as sterilising may cause
serious damage to the heater and will invalidate the warranty.
Before switching the heater on, check that the heater elements and temperature sensors are fully immersed and
that the rated process flow is passing over the heating elements.
Note: The client should ensure that the terminal box is not subjected to direct sunlight at ambient temperatures
above 30°C.
Under no circumstances shall the thermal space (area between the back of the terminal box and process
connection flange/plate) be insulated.
When shown on contract specific drawings, it is a mandatory requirement that the over temperature devices
(excluding spares) are connected back to the dedicated trip system to shut down electrical power to the heater
in the event of over-temperature.
When connecting to thermocouples / RTD’s / transmitters or thermostats as applicable, it is important to note
the polarity of the circuit for the sensor / device to operate correctly and also to ensure that the correct
instrument cable is used for the type of sensors installed. If there is any uncertainty contact TPFay (Kirkby) Ltd for
advice – see Section 1 for contact details.
Where applicable, thermostats that have been factory set require no further adjustment.
Thermostats that have been supplied un-set shall be adjusted to meet process requirements.
Where capillary thermostats require replacement, refer to Appendix D of this manual.
SECTION 5. PRE-COMMISSIONING / COMMISSIONING INSTRUCTIONS
Pre-Commissioning
The following checks should be made prior to commissioning and the equipment should not be energised until all
the items have been completed.
Heater
Check overall physical condition of the heater for any signs of damage.
Installation layout should be neat in appearance.
Check for any loose components and tighten as required.
Remove all debris from enclosures.
Ensure that any preservation items such as VCI pads / silica gel bags are removed.
Disconnect main electrical supply cable and check the insulation resistance of the heater. This can be carried out
by taking a reading between the element sheath and the phase terminals, using a 500v DC megohmmeter. A
reading better than 2 megohm should be obtained. If the readings are lower than this, contact TPFay (Kirkby) Ltd
for advice – see leading particulars for contact details.
Reconnect the cable ensuring terminations are secure.
Ensure both heater and instrument enclosure covers are closed and all fastenings are tight.
Ensure all trip devices are functioning correctly including low flow / no flow safety interlocks.
Check that labels and tags are secure and correct.
Note: A completed ICMS or equivalent will be required in the event of any safety or warranty claim.
Commissioning
The following procedure should be carried out after completion of all the above pre-commissioning checks. All
prevailing site safety regulations should be adhered to at all times.
Heater
Ensure that the correct process flow is available.
Set the control devices to approximately the required temperature.
Switch on the power supply.
Allow the process temperature to stabilise.
Check the temperature and adjust the control devices to achieve the required temperature.
Temperature Controller (If fitted)
The temperature controller should be configured and tuned in accordance with the operating instructions
available from TPFay (Kirkby) Ltd. Refer to section 1 for contact details.
SECTION 6. OPERATING INSTRUCTIONS
General
Heat is transferred to the process by means of resistive electric heating elements. Over temperature protection
is provided by sensing devices as detailed on the general arrangement drawing.
Normal Start-Up
Ensure process flow conditions are correct.
Providing that the controls are set correctly, the heating and temperature control is automatic.
Normal Shutdown
The heater may be de-energised by operating the “off” button either at the control panel or locally where this
facility is provided.
Temperature Control (If fitted)
The control temperature set points can only be changed by adjusting the thermostat inside the heater terminal
enclosure.
If an increase in the process operating temperature is required of more than 10°c, then TPFay (Kirkby) Ltd must
be consulted to verify the resultant element surface temperature is acceptable.
Fault Condition – Over temperature Trip (If fitted)
The trip device fitted to the Heater will only operate in the event of an over-temperature fault occurring. The
reason for the tripped condition should be investigated prior to resetting the system.
Over-temperature trip device located inside the heater terminal box:
In the event that a manual reset trip device operates, this can only be reset at the heater. The device and reset
button are located inside the main heater terminal enclosure and can only be reset when the temperature at the
sensor has fallen below the trip temperature set point.
The trip device will only operate in the event of an over-temperature fault occurring.
Only an authorised person is permitted to reset the trip device.
SECTION 7. MAINTENANCE INSTRUCTIONS
The following preventative maintenance should be carried out at the intervals shown below.
Heater
3 Monthly
i. Generally inspect the equipment for external damage.
6 Monthly
i. Isolate the electrical supply and remove the terminal enclosure cover taking care not to damage the
flame paths (see note 3).
ii. Ensure that internals are clean, dry and free from debris.
iii. Ensure that electrical terminations are undamaged and secure.
iv. Measure insulation resistance of the heating elements.
v. This can be carried out by taking a reading between the element sheath and the phase terminals, using
a 500v DC megohmmeter. A reading better than 2 megohm should be obtained. (see note 2).
vi. Ensure that all earth conductors are correctly fitted between all earth points and main structure.
vii. Check functionality of low flow / no flow safety interlocks.
Annually
i. Check for element failure by comparing phase resistance values. (see note 2).
a. On a healthy three phase system these values should be equal.
b. Only TPFay (Kirkby) Ltd or their approved agent are authorised to carry out element
replacement.
Notes:
1. If heaters are not used for a period in excess of 3 months, they must be tested for insulation resistance.
2. In the event of element failure or low insulation resistance, TPFay (Kirkby) Ltd should be contacted for further
advice – see section 1 for contact details.
3. Do not remove the terminal enclosure cover during wet or humid conditions as this will lead to a reduction in
insulation resistance of the heater.
4. Where capillary thermostats require replacement, refer to Appendix D of this manual.
General Safety Precautions
All prevailing site safety regulations shall be adhered to at all times.
Before removal of the terminal enclosure cover, sufficient time shall be allowed for the internal components to
cool down after electrical isolation.
Before and whilst any maintenance activity is carried out, it must be ensured that there are no hazardous gases
present.
Equipment is to be fully isolated from the electrical supply before and whilst any work is being carried out.
SECTION 8. FAULT FINDING AND CORRECTION – AIR HEATER
Note: Reference should be made to section 7 – maintenance instructions, for procedures relating to these
corrective actions.
FAULT POSSIBLE CORRECTION
Heater fails to achieve required design air temperature
– Isolate power supply
– Check supply fuses
– Check that the temperature control device set points are correct.
– Check that all elements are still operative by taking a load resistance reading. Resistance
between phases should be equal. If they are not equal then contact TPFay (Kirkby) Ltd for
advice
– see section 1 for contact details
– Check that the air flow is not greater than the design rating.
Air temperature too high
– Check that the temperature control device set points are correct.
– Check that the air flow is not less than design rating.
Heater trips
– Check that the air flow is not less than design rating and is evenly distributed across the
duct cross section.
– Check that the supply voltage is correct- Check all trip devices are functioning correctly
and sensors have not failed
– Check ambient temperature is within design limits.
FAULT FINDING AND CORRECTION – IMMERSION HEATER
Note: Reference should be made to section 7 – maintenance instructions, for procedures relating to these
corrective actions.
FAULT POSSIBLE CORRECTION
Heater fails to achieve required design process temperature
– Isolate power supply
– Check supply fuses
– Check that the temperature control device set points are correct.
– Check that all elements are still operative by taking a load resistance reading. Resistance between phases should be equal. If they are not equal then contact TPFay (Kirkby) Ltd for advice – see section 1 for contact details.
– Check that the process flow is not greater than the design rating.
Process temperature too high
– Check that the temperature control device set points are correct.
– Check that the process flow is not less than the design rating.
Heater trips
– Check that the process flow is not less than design rating.
– Check that the supply voltage is correct
– Check all trip devices are functioning correctly and sensors have not failed
– Check ambient temperature is within design limits.
SECTION 9. Specification
Customer Requirement Liquid Immersion Heater Design Criteria
British Standard Specification for Industrial Immersion Heaters using Metal-Sheathed Elements BS 7798 1998
Materials
Screw-plug Brass / Stainless Steel
Element Alloy 800 / Alloy 304 / Alloy 316 sheath
Nickel Chrome Resistance Wire
Magnesium Oxide Powder
Aluminium Oxide Insulating Bead
Mild Steel Terminal Pin 11SMN30
Thermostat Pocket Alloy 800 / Alloy 304 / Alloy 316
Terminal Cover Die-Cast Aluminium / Mild Steel / Stainless Steel / Thermoplastic
Gasket (vessel seal) Compressed Fibre C4324 / Other
Gaskets Terminal Cover Nitrile Rubber
Silicone Sponge
Fixings Brass, Stainless Steel
Power Requirements
Operation Instructions
The heater should be installed and operated in accordance with the requirements of the vessel or equipment to which it is to be fitted.
APPENDIX “B” INSTALLATION, COMMISSIONING & MAINTENANCE SCHEDULE (ICMS)
CHECK ITEM INSPECTION
INITIAL PERIODIC PERIODIC PERIODIC PERIODIC
1.0 Upon receipt of equipment at site, all equipment is in good order and in original packaging (within 48 hours of receipt of equipment)
2.0 Long term storage (every 3 months) Equipment checked in accordance with Preservation & Storage Instructions” included within TPFay IOM manual.
3.0 After installation Date Equipment checked in accordance with "Erection & Installation instructions included within TPFay IOM manual.
4.0 Before operation.
Equipment checked in accordance with & Precommissioning & Commissioning Instructions included within TPFay IOM manual. (See Note 4)
5.0 Ongoing maintenance checks in accordance with Maintenance Instructions included within TPFay IOM manual. (See Note 4)
Notes:
1. This sheet, duly completed, must be submitted with any safety or warranty claims.
2. A separate “ICMS” must be completed for each item of equipment.
3. Where equipment is removed from service a new “ICMS” must be completed upon re-commissioning.
TPFay (Kirkby) Ltd has a team of fully trained engineers who can offer a specialist inspection and maintenance service for equipment they
manufacture.
For further details, please contact our service department.
TPFay (KIRKBY) LTD, 55-65 ADMIN ROAD, KNOWSLEY INDUSTRIAL PARK, LIVERPOOL, MERSEYSIDE L33 7TX UNITED KINGDOM
Telephone +44 (0)3703 50 50 58
Fax +44 (0)3703 50 50 59
info@tpfay.co.uk
This blank form may be photocopied, as required, to record the full service history of the equipment.
APPENDIX ‘D’ – REPLACEMENT OF CAPILLARY THERMOSTATS SUPPLIED BY
TPFay (Kirkby) LTD
Important note: Unless advised in writing to the contrary, only TPFay (Kirkby) Ltd, or its approved agent may undertake replacement of the supplied thermostats.
Scope:
This Appendix is applicable to Non-Hazardous Air and Immersion heater equipment where over-temperature capillary
thermostats have been supplied and either require replacement, or are supplied as commissioning or operating spares.
Procedure:
Customer removal and replacement of the thermostat/s is only permitted, where approval in writing has been given by TPFay
(Kirkby) Ltd, prior to commencement of work.
Removal:
Ensure that the equipment has been fully isolated prior to commencement of work and is safe to work on.
Remove the heater terminal enclosure cover.
Free access to the original thermostat, including the pocket in which its capillary is inserted is required.
It may be necessary therefore to disconnect external cabling, together with the dismantling of the internal bus-bar or
terminal rail.
The capillary may be retained in the pocket by shrink sleeve, which needs to be removed before the capillary can be
withdrawn.
Extreme care should be taken during the removal operation to avoid both personal injury and damage to surrounding cables
and components.
Once the shrink sleeve is removed, the capillary can be carefully withdrawn, along with any rubber-seating washer inserted in
the pocket.
Proceed with dismantling the thermostat body from its rail and remove it, retaining the fixings.
Inspect the pocket to confirm it is free of debris.
Replacement:
Where the replacement thermostat supplied by TPFay (Kirkby) Ltd is an over-temperature protection device it may have been
supplied factory sealed at the required trip setting. No further adjustment is either required or permitted.
Where the replacement thermostat supplied by TPFay (Kirkby) Ltd is an adjustable over-temperature protection device the
device will require adjustment to the desired setting during installation.
Where the thermostat is for process temperature control (or similar), it is likely that the device will require adjustment to the
desired setting during installation.
In either case, the thermostat should be inspected to confirm it matches the device previously removed.
Any discrepancies should be brought to the attention of TPFay (Kirkby) Ltd.
The replacement thermostat may have have been supplied with shrink sleeve, suitable for installation.
Reference should now be made to the thermostat installation drawing included in this Appendix, ensuring the following
requirements are observed:-
The thermostat pocket should be clean and free of grease.
The bulb must locate at the end of the thermostat pocket.
Proceed with installing the thermostat body to its rail, using the existing fixings.
Re-assemble and connect any external cabling, together with the internal busbar or terminal rail using the wiring diagram as a
reference.
Upon completion, an electrical continuity check on the thermostat/s in accordance with TPFay (Kirkby) Ltd electrical test
procedure should be made.
Where the thermostat is not supplied pre-set, adjust to the desired temperature.
Upon successful completion of testing, ensure all debris is removed from the terminal enclosure and re-fit the cover.