Powrmatic VPC 30, VPC 80, VPC 110, VPC 52, VPC 130 User, Installation And Servicing Instructions
Page 1
Issue 5.1 Sept 2014
Users, Installation and Servicing Instructions
(Brahma Control, L4064)
WARNING: THIS APPLIANCE MUST BE EARTHED
IMPORTANT: Reset from Lockout is by a switched Neutral
GB & IE H E A T I N G / / V E N T I L A T I O N / / A I R C O N D I T I O N I N G
VPC Gas Cabinet Heater Range
Industrial & Commercial Heating Systems.
Page 2
powrmatic
Certificate of Guarantee
Dear Customer
This is to certify that this heater is guaranteed for two years parts and one year labour
from the date of original commissioning. The heater must be commissioned within 4
weeks of installation.
To make a claim
In the first instance you must contact your appliance supplier, or installer and provide:-
1. The appliance type and serial number.
2. The original commissioning documentat
ion.
3. As much detail as possible on the fault.
Your supplier, of installer, will then contact Powrmatic to make a guarantee claim on
your behalf.
Conditions of Guarantee
1. The heater must have been installed by a competent regognised instraller, and in
accordance with the manufactures instructions, building regulations and local
regulations.
2. The heater has been professionally commissioned
, within 4 weeks of installation,
and a copy of the Commissioning Sheet returned to Powrmatic.
3. The heater has been maintained on a yearly basis by a competent servicing
company.
4. The heater has been used in accordance with the manufactures instructions.
5. The correct specification fuel has been used.
6. No unauthorised repairs of modifications have been made.
7. Powrmatic ‘General Conditi
ons of Sales’ have been observed.
8. Except for the obligation of Powrmatic Ltd to perform warranty repairs during the
guarantee period Powrmatic will not be liable in repect of any claim for direct or
indirect consequential losses, including loss of profits or increased cost arising from
loss of use of the heater, or any event arising there from.
Exclusions
1. Gaskets and fan belts are not included in the guarantee.
----------------------------------------------------
Powrmatic Ltd, Hort Bridge, Ilminster, Somerset, TA19 9PS
Tel:01460 53535 Fax: 01460 52341
Web: www.powrmatic.co.uk e-mail service@powrmatic.co.uk
Important: This certificate must
be kept with the appliance
Failure to provide a copy of the commissioning sheet invalidates the heater waranty
Page 2 VPC Range Users, Instrucons & Service Instrucons Issue 5.1 Sept 2014
Installer
Date :_____________ Signed ____________________________________________Installer
Commissioned
Date :_____________ Signed _______________________________Commissioning Engineer
Page 3
Dear Customer - thank you for choosing Powrmac.
We appreciate you buying one of our high quality products and know that you have made the best
choice. By choosing Powrmac, you are invesng in UK manufacturing & its workforce. We pride
ourselves by manufacturing products that provide clean, comfortable and safe working environments worldwide together with the personal & professional service and back-up you deserve. If you
have any quesons or concerns regarding this product, please contact our Technical Support Team by
calling 01460 53535.
Users, Installaon and Servicing Instrucons
CONTENTS
Title Secon Contents Page
User Instrucons 4
Pre Installaon
1.1 Introducon 5
1.2 General Requirements 6
1.3 Size Data 8
Installaon
2.1 Fing the unit 9
2.2 Fing the Flue 10
2.3 General Idenficaon of Electrical Items 13
2.4 Electrical Cable Instrallaon 14
2.5 Commissioning and Tesng 14
Data
3.1 Technical Data 17
3.2 Short List of Parts 19
Addional Documents
4.1 Servicing 21
4.2 Funconal Flow Diagram 23
VPC Range Users, Instrucons & Service Instrucons Issue 5.1 Sept 2014 Page 3
Page 4
Users Instructions
Page 4 VPC Range Users, Instrucons & Service Instrucons Issue 5.1 Sept 2014
A) First Start Sequence
Follow the sequence below before lighting the heater(s)
for the first time.
a) Ensure that the gas supply to the unit is
turned OFF.
b) Turn on the electrical supply to the heater
and program the controls in accordance
with their instructions.
c) Ensure that the controls are not calling
for heat i.e. the thermostat is at minimum
or the clock control is set to an OFF
period or the function switch is set to
OFF.
d) If necessary reset the internal control
from lockout by pressing the reset button
on the external control for 1-2 seconds.
e) Press the limit interlock reset switch on
the front panel of the heater. (Note: This
step is not performed again unless there
is an interruption in the electrical supply
to the heater).
f) Ensure that the Summer/Winter switch is
in the Winter position.
g) On ducted systems check that all warm
air delivery outlets are open.
h) Turn ON the gas supply.
B) Lighting the Air Heater
NOTE:On initial lighting of the heater(s), it may
take some time to purge the internal pipework of
air. If it is not possible to light the heater after
several attempts contact the local service company.
1. Set the controls to call for heat and the ignition
start up sequence will commence. The internal
exhaust fan will run. When sufficient combustion
airflow is proved by the air pressure switch the
ignition spark will be generated and the main gas
valves energized. The burners will then light.
2. If the burner fails to light the control box will
attempt four further ignition attempts before going
to lockout. The lockout light on the MC200 or
Powrtrol will be illuminated (Note: If an integral
MC200 or Powrtrol are not used a remote lockout
indicator/reset will be fitted). To restart the ignition
sequence, depress the reset button on the control
for 1-2 seconds. If the unit will not light after two
or three attempts then shut down the unit and call
in a service engineer.
C) To Shut Down the Air Heater
1) For Short Periods:
Turn the room thermostat to the OFF or lowest setting.
2) For Long Periods:
Complete step 1) above. Wait for 5 minutes and then turn
OFF the electrical supply at the isolator.
D) Description of Operation
Important: All heaters must be controlled by the
fitted external controls and not by use of the main
switch in the electrical supply to the heater.
1) Standard Units
The ignition sequence will commence each time that the
external controls e.g. Time clock, room thermostat etc.
call for heat. Approximately 15 – 30 seconds after the
main burners light the heater fan will be automatically
started. When the external controls are satisfied the main
burners will be turned off and approximately 2 - 3 minutes
later the heater fan will be automatically stopped.
2) High / Lo & Modulating Units
When the main burners are alight the heat output will be
controlled either to high fire or low fire or, in the case of
modulating units, to any point between high and low fire;
depending on the requirements of the space being heated
and the control system.
3) Summer / Winter Modes
The integral MC200 or Powrtrol controls, and certain
types of external controls, will provide for two modes of
operation i.e.
Summer: The heater fan alone will run at the
dictate of the external controls to provide
air movement.
Winter: The heater will operate normally.
4) Fan and Limit Control
The fan and limit controls are mounted towards the top of
the air heater inner bulkhead and are accessed via the
front door.
i) Main Air Fan MAN / Auto
When the white button (Refer to Figure 1) is pushed in the
fan will run continuously i.e. not controlled by any external
controls e.g. Time clock. When the white button is pulled
out the fan will start and stop automatically in conjunction
with the burner. See Section 2.5
ii) Limit Thermostat
This operates if high temperatures within the heater are
detected, the burners are turned off and a red indicator
light on the front of the heater is illuminated. The fault
Page 5
condition must be identified and rectified and the thermostat manually reset.
When the unit has cooled push the reset switch on the
front of the heater to reset the limit thermostat interlock
relay, the red indicator light will go out and the unit is operational again.
Note: The limit thermostat(s) can only be reset
once the unit has cooled down.
Unless the cause of the fault condition is readily
obvious, for example a power cut whilst the
heater was operating, a service engineer should
be contacted.
Note: The limit thermostat interlock relay will
require resetting after loss of the electrical supply
to the heater regardless of whether the limit
thermostat has operated.
E) Maintenance
Regular servicing is essential to maintain efficient, reliable
and safe operation of the heater. Users are strongly
recommended to have the heater serviced by a qualified
person at least annually and preferably at the end of the
heating season.
F) IMPORTANT
Free access must be maintained to and around
the heater for servicing purposes and the air
supply to the heater must not be restricted in any
way.
Combustible materials must not be stored adjacent to the heater.
If at any time a gas leak is suspected turn OFF
the as supply - DO NOT USE A NAKED FLAME and contact the local gas undertaking immediately.
All Powrmatic heaters use gas and electricity to
power them, they may also contain moving parts
such as pulley belts. It would be hazardous to
tamper with or attempt to service unless you are
a competent person in the field of Gas and Electrical work. If you have any safety questions reference the servicing and installation of any of
our heaters please do not hesitate to contact our
head office for expert advice.
Your safety is paramount to us.
Gas Safety (Installation & Use) (Amendment)
Regulations
It is law that all gas appliances are installed,
adjusted and, if necessary, converted by qualified
persons* in accordance with the current issue of
the above regulations. Failure to install appliances correctly can lead to prosecution. It is in your
own interests and that of safety to ensure
that the law is complied with.
* An approved class of person listed on the gas
register.
VPC Range Users, Instrucons & Service Instrucons Issue 5.1 Sept 2014 Page 5
1.1 Introduction
The VPC range are highly efficient gas fired, fanned circulation floor standing air heaters that cover heat outputs of
30kW to 130kW. The units have a single closed flue
system that can be either vertical or horizontal and feature
a single burner assembly which as standard is ON/OFF
but can also be supplied in High/Low or Modulating
formats. High/Low or Modulating formats give a turn down
facility of approximately 2:1. The heaters are certified for
use on Natural Gas, Group H - G20, and Propane - G31
only.
Appliance Categories are Cat II2H3P (GB, IE).
The heaters intended primarily for heating commercial or
industrial premises. They must not be used where the
atmosphere inside the premises could be contaminated
e.g. Dust, oil mist etc. or in areas classified as hazardous
as defined in BS 5345: Part 2. They are not suitable for
siting externally.
VPC heaters have a centrifugal fan assembly fitted at the
base of the heater to circulate the air being heated past
the formed tube heat exchanger.
Heaters are fitted as standard with one set of atmospheric
inshot burners having a fully automatic control for ignition,
PUSH MAN
PULL AUTO
Honeywell
Fig 1. Limit Thermostat
White
Fan
button
Page 6
Page 6 VPC Range Users, Instrucons & Service Instrucons Issue 5.1 Sept 2014
1.2 General Requirements
1.2.1 Related Documents
The installation of the air heater(s) must be in accordance
with the rules in force and the relevant requirements of the
Gas Safety Regulations, Building Regulations and the
I.E.E. Regulations for Electrical Installations.
It should also be in accordance with any relevant requirements of the local gas region, local authority and fire
authority and the relevant recommendations of the following documents.
Institution of Gas Engineers & Managers
IGE/UP/1 (Ed.2) Strength and tightness testing and purging of industrial and commercial gas installations.
IGE/UP/1A Soundness testing and direct purging of small
low pressure industrial and commercial gas installations.
IGE/UP/2 Gas installation pipe work, boosters and compressors on industrial and commercial premises.
IGE/UP/10 Installation gas appliances in industrial and
commercial premises.
British Standards Code of Practice
BS 5588 Fire precautions in the design and construction
of buildings.
Part 2 : 1985 Code of Practice for Shops
Part 3 : 1983 Code of Practice for Office Buildings
BS 6230: 1991 Installation of Gas Fired Forced Convection Air Heaters for Commercial and Industrial Space
Heating.
Those appliances having a gross input rating not exceeding 60kW viz. VPC30, and installed so as to take their
combustion air from within the building must be installed
in accordance with the relevant recommendations of the
following document.
BS 5440 Flues and Air Supply for gas appliances of rated
input not exceeding 60kW (1st and 2nd family gases),
Part 2 – Air Supply
1.2.2 Location
The location chosen for the air heater must permit:
- the provision of a satisfactory flue system and an
adequate air supply.
- adequate space for servicing and air circulation around
the air heater.
The heater(s) must not be installed in conditions for which
it is not specifically designed e.g. where the atmosphere is
corrosive or salty. Standard units are not suitable for
outdoor location.
Where the location of the air heater is such that it might
suffer external mechanical damage e.g. from overhead
cranes, fork lift trucks, it must be suitably protected.
VPC units are designed to operate within an ambient
temperature range of -10 to 25°C.
1.2.3 Gas Supply
1.2.3.1 Service Pipes
The local gas undertaking should be consulted at the
installation planning stage in order to establish the availability of an adequate supply of gas. An existing service
pipe must not be used without prior consultation with the
local gas undertaking.
1.2.3.2 Meters
A gas meter is connected to the service pipe by the local
gas undertaking or a local gas undertaking contractor. An
existing meter should be checked, preferably by the gas
undertaking, to ensure that the meter is adequate to deal
with the total rate of gas supply required.
1.2.3.3. Installation Pipes
Installation pipes should be fitted in accordance with
IGE/UP/2. Pipework from the meter to the air heater must
be of adequate size. Do not use pipes of a smaller size
than the inlet gas connection of the heater. The complete
installation must be tested for soundness as described in
the above Code.
1.2.3.4. Boosted Supplies
Where it is necessary to employ a gas pressure booster
the controls must include a low pressure cut off switch at
the booster inlet. The local gas undertaking must be
consulted before a gas pressure booster is fitted.
flame sensing, gas supply control and safety functions
and an internal exhaust fan, as well as the main air fan(s)
and limit thermostat.
IMPORTANT
Service and Maintenance Engineers shall ensure
that replacement items are fitted, adjusted and
set in accordance with the data and detail set out
in these instructions. If in doubt consult Powrmatic Technical Department.
Gas Safety (Installation & Use) Regulations
It is law that all gas appliances are installed,
adjusted and, if necessary, converted by qualified
persons* in accordance with the current issue of
the above regulations. Failure to install appliances correctly can lead to prosecution. It is in your
own interests and that of safety to ensure that the
law is complied with.
* An approved class of person listed on the gas
register.
Page 7
1.2.4 Flue System
VPC units must be used with a closed flue system and
have an internal exhaust fan, mounted downstream of the
heat exchanger, to both assist the evacuation of the products of combustion and to draw in air for combustion.
The flue should terminate in a freely exposed position and
must be so situated as to prevent the products of combustion entering any opening in a building in such concentration as to be prejudicial to health or a nuisance.
1.2.5 Combustion Air Supply
Where VPC units are to be installed within the space
being heated and take the air for combustion from that
space then for buildings having a design air change rate
of less than 0.5/h, and the heated space has a volume
less than 4.7 m³/kW of total rated heat input grilles shall
be provided at low level as follows:-
(1) for heaters of heat input less than 60 kW, the
total minimum free area shall not be less than
4.5 cm² per kilowatt of rated heat input.
(2) for heaters of heat input 60 kW or more, the total
minimum free area shall not be less than
270cm² plus 2.25 cm² per kilowatt in excess of
60 kW rated heat input.
Where the air heater(s) are to be installed in a plant room
the plant room must have permanent air vents communicating directly with the outside air, at high level and at low
level. Where only high level air vents are available, ducting down to floor level for the lower vents should be used.
All air vents should have negligible resistance and must
not be sited in any position where they are likely to be
easily blocked or flooded or in any position adjacent to an
extraction system which is carrying flammable vapour.
Grilles or louvres should be so designed that high velocity
air streams do not occur within the plant room.
The basic minimum effective area requirements of the air
vents are as follows:
(a) Low Level (inlet)
1. for heaters of total rated heat input less than
60kW: 9cm² per kilowatt of rated heat input.
2. for heaters of total rated heat input 60kW or
more:540 cm² plus 4.5 cm² per kilowatt in
excess of 60kW total rated input.
(b) High Level (outlet)
(1) for heaters of total rated heat input less than
60kW: 4.5cm² per kilowatt of rated heat input.
(2) for heaters of total rated heat input 60kW or
more: 270 cm² plus 2.25 cm² per kilowatt in
excess of 60kW total rated input.
1.2.6 Air Distribution System
VPC units used in buildings having a low heat loss i.e.
where single units are required to cover a large floor area,
and in buildings with high roof or ceiling heights Calecon
thermal economiser units should be fitted to ensure even
heat distribution and minimise stratification.
Care should be taken to avoid impeding the air throw with
racking, partitions, plant or machinery etc.
Care must be taken to ensure that return-air intakes are
kept clear of sources of smells and fumes, and where
there is any possibility of pollution of the air by dust, shavings etc., precautions must be taken to prevent contamination.
If necessary suitable barrier rails should be provided to
prevent any combustible material being placed within
900mm of the warm air outlets.
1.2.7 Electrical Supply
Wiring external to the air heater must be installed in accordance with the I.E.E. Regulations for Electrical Installations and any local regulations which apply. Wiring should
be completed in flexible conduit.
All standard heaters are supplied by 230V - 1N, 50Hz or
400V- 3N, 50Hz depending on the size.
The method of connection to the main electricity supply
must: o Facilitate the complete electrical isolation of the
unit(s)
o Be in a readily accessible position adjacent to
the unit(s)
o Serve only the unit(s)
o Have a contact separation of at least 3mm in all
poles. See the accompanying wiring diagram for
the heater electrical connections.
VPC Range Users, Instrucons & Service Instrucons Issue 5.1 Sept 2014 Page 7
Page 8
Page 8 VPC Range Users, Instrucons & Service Instrucons Issue 5.1 Sept 2014
Model
VPC 30
VPC 52
VPC 80
VPC 110
VPC 130
1108
1108
1412
1767
1767
750
750
750
750
750
1676
2132
2132
2043
2209
100
100
130
130
130
265
265
265
265
265
1378
1832
1756
1667
1835
142
142
220
220
220
237
237
237
237
237
286
286
340
340
400
581
581
672
672
788
256
256
308
308
358
657
657
960
1315
1315
650
650
650
650
650
A B C DØ E F G H J J1 K L M
1.3 Size Data
2
2
3
4
3
HEAD
PLAN
Head Plan 2 Head Plan 3 Head Plan 4
Page 9
VPC Range Users, Instrucons & Service Instrucons Issue 5.1 Sept 2014 Page 9
Before installation, check that the local distribution conditions, nature of gas and pressure, and adjustment of the
appliance are compatible.
The air heater must be installed in accordance with the
rules in force and the relevant requirements of any fire
regulations or insurance company's requirements appertaining to the area in which the heater is located, particularly where special risks are involved such as areas where
petrol vehicles are housed, where cellulose spraying is
carried out, in wood working departments etc.
2.1.1 Minimum Clearance
The following minimum clearances for installation and
servicing must be observed.
Blank Side 0.15m
Louvered side 0.5m
Top of the heater to ceiling 1.0m
Rear of heater to nearest wall 0.5m
Front of heater to nearest wall 1.0m
Fig 1 Minimum clearance distances.
Any combustible material adjacent to the air heater and
the flue system must be so placed or shielded as to
ensure that its temperature does not exceed 65 °C.
IMPORTANT:
1. Heaters shall not be installed in:a) Those parts of spaces within buildings that
have been classified as hazardous areas as
defined in BS 5345 : Part 2.
b) Where there is a foreseeable risk of flammable
particles or gases or corrosion inducing gases or
vapours being drawn into either the heated air
stream or the air for combustion.
c) In areas subjected to significant negative pressures due to extract systems.
2.1.2 Fitting the Air Heater
If necessary consideration should be given to mounting
the heater on resilient pads, or equivalent, to minimise
transfer of noise and vibration to the structure of the building.
Floor mounted heaters must be installed on a level
noncombustible surface.
Heaters mounted at high level must be supported on a
purpose designed platform or framework that is suspended from vertical drop rods, chains or straps or mounted on
specifically designed cantilever brackets from a non-combustible wall. The method of installation support must be
capable of adequately supporting the weight of the unit
(See Table 2 Page 16) and any ancillary equipment.
Before installing the heater the existing structure must be
inspected to ensure it is suitable. All supports should be
protected against the effects of rust or corrosion.
Any combustible material adjacent to the air heater and
the flue system must be so placed or shielded as to
2.1 Fitting the unit
1.0m
1.0m
0.5m
Model 30 52 80 110 130
L 657 657 960 1315 1315
N 757 757 1060 1415 1415
Page 10
Page 10 VPC Range Users, Instrucons & Service Instrucons Issue 5.1 Sept 2014
ensure that its temperature does not exceed 65 °C.
If the method of mounting allows for any movement of the
heater it is essential that all gas, duct, and electrical
connections to the heater are made with flexible connections to maintain continuity of connection.
2.1.3 Gas Connection
To facilitate servicing a servicing valve and downstream
union must be fitted at the inlet to the air heater. The gas
supply to the air heater must be completed in solid pipe
work and be adequately supported. Heaters suspended
by drop rods, straps or chains must have a flexible
connection as the final link between the gas supply pipe
work and the heater. Sufficient slack must be left in the
connection to take account of normal movement of the
heater.
Warning
When completing the final gas connection to the
heater do not place undue strain on the gas pipe
work of the heater.
2.1.4 Air Distribution System General
VPC heaters, if required, can be used with duct work
either to more precisely define the point of air delivery,
and /or provide ducted return air or ducted fresh air inlet.
The system should be checked to ensure that the installation work has been carried out in accordance with the
design requirements. Particular attention should be given
to the correct arrangement of delivery ducts and registers, return air ducts and grills and general adequacy of
return air paths. Ensure that the total duct system resistance does not exceed the available air pressure of the
equipment supplied refer to Table 2 Page 16. If the duct
system resistance is less than the available air pressure
of the equipment supplied additional resistance must be
introduced e.g. by adjustment of duct outlet nozzles and
balancing of the duct system. Conversely if the duct
system resistance is greater than the available air pressure of the heater supplied the system resistance must
be reduced.
2.1.5 Room Thermostat Siting
If a separate room thermostat is used it should be fitted at
a point which will be generally representative of the
heated area as far as temperature is concerned. Draughty areas, areas subjected to direct heat e.g. from the sun,
and areas where the air movement is relatively stagnant
e.g. in recesses, are all positions to be avoided for siting
the thermostat. The thermostat should be mounted about
1.5m from the floor. Any room thermostat, frost thermostat, time clock etc. must be suitable for switching 230V,
5A and must be of the 'snap action' type to minimise
contact bounce. For electrical connections of external
controls see the accompanying wiring diagram.
2.2 Flue/Combustion Air Duct System
All models are supplied as standard with a top flue outlet
and combustion air inlet.
2.2.1.1. Conversion to Side Flue Outlet
(1) Remove the two blanking plates from the flue
/combustion air openings at the side of the unit.
(2) Disconnect the flexible pipe from the exhaust
spigot.
(3) Remove the four screws securing the exhaust
spigot and reposition the spigot to the side of the
heater using the top position. Refit the flexible
pipe.
(4) Remove the four screws securing the combustion
air spigot and reposition spigot to the side of the
heater.
(5) Refit the blanking plates to cover the holes in the
top of the heater.
2.2.1.2 Internal Combustion Air
1. If ducted combustion air is not required (see Section
3.5) fit the mesh inlet plate (supplied loose) behind the
unused combustion air inlet hole.
2.2.2. General Requirements
See Figures 2a to 3b Page 11 for the different types of flue
installation. In all cases the flue outlet socket must be
connected via the provided flue system to outside air. The
maximum permitted length of flue system is 6m, or 12m if
the flue outlet only is used. If an offset is required two sets
of 45° bends may be used each set being equivalent to
0.5m of flue length. The minimum flue length (end of flue
terminal to side or top of heater) shall not be less than
1.3m.
All outer joints must be finished with the provided locking
bands. A smear of silicon grease to the inside of sockets
will assist in fitting components together. All flue and combustion air ducts must be supported independently of the
air heater. The flue or flue/combustion air terminal must
not be installed so as to be less than:
- 300mm below an opening e.g. window, air brick
etc.
- 200mm below eaves or gutter.
- 300mm from an internal or external corner.
- 1200mm from a surface facing the terminal.
- 1500mm vertically from another terminal on the
same wall.
- 300mm horizontally from another terminal on the
same wall.
- 2000mm from ground level.
2.2.3 Installation of Flue System
2.2.3.1 Horizontal System - Side Outlet
1. Locate the position of the flue terminal, allowing
for a slight gradient running down from the heater
to the terminal of 2° - 3° and cut a hole in the
building wall to suit.
2. Fit the flue terminal, securing via the wall plate
and weather with silicon sealant or similar.
3. Fit the twin to concentric adaptor to the terminal
section and extend the flue and combustion air
ducts to the heater using straight lengths. Fit an
adjustable length prior to the unit, to facilitate flue
disconnection for servicing. Extend the
adjustable lengths to make the final connection to
the appropriate heater inlet/outlet spigots.
4. Ensure that internal silicon sealing rings are in
place and that all tubes are pushed fully home.
Secure concentric lengths with the locking bands
provided.
2.2 Flue fitting
Page 11
VPC Range Users, Instrucons & Service Instrucons Issue 5.1 Sept 2014 Page 11
air heater. The flue or flue/combustion air terminal must
not be installed so as to be less than:
- 300mm below an opening e.g. window, air brick
etc.
- 200mm below eaves or gutter.
- 300mm from an internal or external corner.
- 1200mm from a surface facing the terminal.
- 1500mm vertically from another terminal on the
same wall.
- 300mm horizontally from another terminal on the
same wall.
- 2000mm from ground level.
2.2.3 Installation of Flue System
Note: A terminal guard, as supplied by Powrmatic
Ltd, must be fitted to horizontal flue terminals.
2.2.3.1 Horizontal System - Side Outlet
1. Locate the position of the flue terminal, allowing
for a slight gradient running down from the heater
to the terminal of 2° - 3° and cut a hole in the
building wall to suit.
2. Fit the flue terminal, securing via the wall plate
and weather with silicon sealant or similar.
3. Fit the twin to concentric adaptor to the terminal
section and extend the flue and combustion air
ducts to the heater using straight lengths. Fit an
adjustable length prior to the unit, to facilitate flue
disconnection for servicing. Extend the
adjustable lengths to make the final connection to
the appropriate heater inlet/outlet spigots.
4. Ensure that internal silicon sealing rings are in
place and that all tubes are pushed fully home.
Secure concentric lengths with the locking bands
provided.
2.2.3.2 Vertical System - Top Outlet
1. Locate the position of the flue terminal cut a hole
in the roof to suit.
2. Fit the flashing and the flue terminal so that the
lower edge of the outer case is over the top of the
flashing. Weather with silicon sealant or
equivalent.
Fit a condensate drain length into the flue socket
on the heater and an equivalent straight length
onto the combustion air socket.
3. Fit the twin to concentric adaptor to the terminal
section and then extend down to the heater using
straight lengths. Fit adjustable lengths as the final
connection pieces, to facilitate flue disconnection
for servicing. Extend the adjustable lengths to
make the final connection but do not exceed the
maximum extended length so as to maintain joint
integrity.
Extend the drainage off take of the condensate
drainage length to a suitable gully or drain.
4. Ensure that internal silicon sealing rings are in
place and that all tubes are pushed fully home.
Secure concentric lengths with the locking bands
provided.
2.2.3.3 Internal Combustion Air Systems
1. Complete the run of flue sections from the
terminal spigot to the flue outlet socket of the
heater generally as described in 2.2.3.1 and
2.2.3.2, ensuring that the internal silicon sealing
rings are in place.
2. Ensure that the mesh inlet plates have been fitted
(see 2.2.1.2) to both the top and side combustion
air inlet positions.
i) Final overall length of adjustable disconnection
piece must be between 360 - 415mm.
ii) 45° offsets may be used if required. Each set is
equivalent to 0.5m of flue length.
iii) Where VPC heaters are used in clean
environments it is permissible to take the
combustion air directly from the heated space.
The supplied mesh intake plate, must be fitted to
the combustion air inlet on the rear of the heater.
Page 12
Page 12 VPC Range Users, Instrucons & Service Instrucons Issue 5.1 Sept 2014
Fig 2a Exhaust only system - horizontal Fig 3a Individual system - horizontal
Fig 3b Individual system - vertical
6m maximum
Terminal
Lengths
Adjustable
lengths
Single to twin
adaptor
Flashing
Flue socket
Combustion air
socket
Condensate drain
length
Fig 2b Exhaust only system - vertical
12m maximum
Terminal
Lengths
Adjustable
length
Flashing
Flue
socket
Combustion air entry
(fitted with inlet grille)
Condensate drain
length
Terminal
Lengths
Adjustable
length
Flue
outlet
Combustion air entry
(fitted with inlet grille)
12m maximum
Terminal
Lengths
Adjustable
length
Single to twin
adaptor
Flue socket
Combustion
air duct
6m maximum
Combustion
air socket
Combustion air entry
(fitted with inlet grille)
Combustion air entry
(fitted with inlet grille)
Page 13
VPC Range Users, Instrucons & Service Instrucons Issue 5.1 Sept 2014 Page 13
2.3 General Identification of Electrical Items
Fan/Limit Stat
Exhaust Fan
Pressure Switch
Gas Valve
Manual O/Ride
Burner Reset
High Limit Reset
MC200
Contactor
Overload
Page 14
Page 14 VPC Range Users, Instrucons & Service Instrucons Issue 5.1 Sept 2014
2.4 Electrical Cable Installation
2.4 Electrical Connections
All units are fully prewired and only require final connections for the incoming mains supply and fitment of the
MC200. The control is shipped inside the heater burner
compartment. Pass the connection cable through the hole
in the front door, fit the control onto the outside of the door
and connect the cable to the P.C.B. inside the heater. If a
MC200 or Powrtrol are not being used, complete the
control circuit (230V) via a room thermostat, time clock
etc. All units must be earthed. The electrical supply must
be run to a point adjacent to the heater and be suitably
terminated to provide an isolation point that will prevent
remote activation of the unit during servicing. Reference
must be made to Table 4 (Page 3) to ascertain the electrical loading of the unit(s) being installed so that cables of
adequate cross-sectional area are used for the electrical
installation. The length of the conductors between the
cord anchorage and the terminals must be such that the
current carrying conductors become taut before the earth
conductor if the cable or cord slips out of the cord anchorage. All external controls must be of an approved type.
See the wiring diagram accompanying these instructions.
A = 2 core and earth
B = Powrtrol = 4 core and earth
Powrtrol RR = 6 core and earth
MC200 On/Off= 6 core and earth
MC200 Hi/Lo = 7 core and earth
MC200 Mod = 8 core and earth
C = Screened 2 core
(MC200 models only)*
* (screen must be grounded only at
the MC200, See instructions
supplied with controller for wiring
sizing, Max. 100m)
RUNNING
MODEL PHASE AMPS
(A)
VPC 30 1 4.5
VPC 52 1 5.2
VPC 80 1 11.4
VPC 110 1 9.3
VPC 130 1 10.7
VPC 110 3 3.4
VPC 130 3 4.5
2.5 Commissioning and Testing
2.5.1 Electrical Installation
Checks to ensure electrical safety must be carried out by
a qualified person.
2.5.2 Gas Installation
The whole of the gas installation, including the meter,
should be inspected and tested for soundness and
purged in accordance with the recommendations of
IGE/UP/1 (Edition 2) or IGE/UP/2A as appropriate.
2.5.3 First Start Sequence
Follow the sequence below before lighting the heater(s)
for the first time.
a) Ensure that the gas supply to the unit is turned
OFF.
b) Turn on the electrical supply to the heater and
program the controls in accordance with their
instructions.
c) Ensure that the controls are not calling for heat
i.e. the thermostat is at minimum or the clock
control is set to an OFF period or the function
switch is set to OFF.
d) If necessary reset the internal control from
lockout by pressing the reset button on the
external control for 1-2 seconds.
e) Press the limit interlock reset switch on the front
panel of the heater. (Note: This step is not
performed again unless there is an interruption
in the electrical supply to the heater).
f) Ensure that the Summer/Winter switch is in the
Winter position.
g) On ducted systems check that all warm air
delivery outlets are open.
h) Turn ON the gas supply.
2.5.4 Lighting the Air Heater
2.5.4.1 All Models
1. Adjust the controls to call for heat and the
ignition sequence will commence. After a delay
of approximately 45 seconds the ignition spark
will be generated and the main gas valves
energized. The burners will then light followed in
15 - 30seconds by the main air fan.
2. If the burners fail to light the control box will
attempt two further ignition tries before going to
lockout and the lockout light on the internal pcb
will be illuminated. To restart the ignition
sequence depress the reset button adjacent to
the lockout light for at least 3 seconds.
3. SHUT OFF
Set the clock control to OFF or set the room
thermostat to MIN.
2.5.5 Adjustments
2.5.5.1 Burner Gas Pressure
This is set for the required heat input before despatch. In
the case of Hi/Lo and Modulating units both high and low
pressures are set. Pressures should be checked in the
following manner.
Page 15
VPC Range Users, Instrucons & Service Instrucons Issue 5.1 Sept 2014 Page 15
c) Ensure that the controls are not calling for heat
i.e. the thermostat is at minimum or the clock
control is set to an OFF period or the function
switch is set to OFF.
d) If necessary reset the internal control from
lockout by pressing the reset button on the
external control for 1-2 seconds.
e) Press the limit interlock reset switch on the front
panel of the heater. (Note: This step is not
performed again unless there is an interruption
in the electrical supply to the heater).
f) Ensure that the Summer/Winter switch is in the
Winter position.
g) On ducted systems check that all warm air
delivery outlets are open.
h) Turn ON the gas supply.
2.5.4 Lighting the Air Heater
NOTES: On initial lighting of the heater(s), it may
take some time to purge the internal pipework of
air.
IMPORTANT:
The internal pipework of the appliance has been
tested for soundness before leaving the factory.
After establishing the main burners test round the
gas inlet connection using a leak detection fluid
e.g. soap solution.
2.5.4.1 All Models
1. Adjust the controls to call for heat and the
ignition sequence will commence. After a delay
of approximately 45 seconds the ignition spark
will be generated and the main gas valves
energized. The burners will then light followed in
15 - 30seconds by the main air fan.
2. If the burners fail to light the control box will
attempt two further ignition tries before going to
lockout and the lockout light on the internal pcb
will be illuminated. To restart the ignition
sequence depress the reset button adjacent to
the lockout light for at least 3 seconds.
3. SHUT OFF
Set the clock control to OFF or set the room
thermostat to MIN.
2.5.5 Adjustments
2.5.5.1 Burner Gas Pressure
This is set for the required heat input before despatch. In
the case of Hi/Lo and Modulating units both high and low
pressures are set. Pressures should be checked in the
following manner.
2.5.6.1.1 Standard Units
1. Set external controls to ensure that the main burner is
off.
Open the access door. Connect a pressure gauge to the
burner pressure test point on the multifunctional control.
2. Set external controls so as to turn on the main burner.
Compare the measured burner gas pressure to that stated
on the data plate.
If necessary adjust the burner gas pressure by turning the
regulator screw anticlockwise to decrease the pressure,
or clockwise to increase the pressure.
3. In addition it is advisable to check the gas rate using the
gas meter dial pointer. Ensure that no other appliances
supplied through the meter are in operation.
If required, after checking or setting the burner pressures,
the CO2 content in the flue gases can be checked by sampling in the first section of flue fitted to the flue outlet of the
unit.
Nominal CO2 values are 8-9%.
4. Turn off the main burner as in 6.5.1. and disconnect the
pressure gauge and replace the sealing screw. Turn on
the main burner as above and test for gas soundness
around pressure test joint using a leak detection fluid e.g.
soap solution.
2.5.6.1.2 High/Lo Regulator
1. Set external controls to ensure the main burner is off.
Open the side access panel. Connect a pressure gauge to
the burner pressure test point on the multifunctional
control.
2. Set external controls to turn on the main burner and
maintain high fire. Compare the measured burner gas
pressure to that stated on the data plate. In addition it is
advisable to check the gas rate using the gas meter dial
pointer ensuring that no other appliances supplied
through the meter are in operation.
Page 16
Page 16 VPC Range Users, Instrucons & Service Instrucons Issue 5.1 Sept 2014
3. Repeat 2 above with external controls set to maintain
low fire.
4. If it is necessary to adjust either the high fire or low fire
pressures proceed as follows after levering off the plastic
cover from the Hi/Lo regulator.
Note: High fire setting must be adjusted first after which
the low fire setting can be set. Any adjustment of the high
fire setting alters the minimum setting.
Maximum Setting
With the controls set to high fire use an adjustable or 8mm
spanner to turn the adjustment screw for high fire pressure, clockwise to increase and counter-clockwise to
decrease, until the required pressure is obtained. Turn the
burner On and OFF several times to check the pressure
setting and then turn off.
Minimum Setting
Disconnect electrical connection of high/low regulator and
turn burners back on and wait until the burner pressure
has stabilized.
Use a screwdriver to turn the slotted adjustment screw for
low fire pressure, clockwise to increase and counter-clockwise to decrease, until the required pressure is
obtained. Reconnect high/low regulator and check high
fire pressure.
Repeat both steps if necessary and then replace cover
cap.
5. Turn off the main burner, disconnect the pressure
gauge and replace the sealing screw. Turn on the main
burner and test for gas soundness around pressure test
joint using a leak detection fluid. Replace access panel.
2.5.6.1.3 Modulating Regulator
1. Set external controls to ensure that the main burner is
off. Open the side access panel. Connect a pressure
gauge to the burner pressure test point on the multifunctional control.
2. Set external controls so as to turn on the main burner
and maintain high fire. Compare the measured burner gas
pressure to that stated on the data plate. In addition it is
advisable to check the gas rate using the gas meter dial
pointer ensuring that no other appliances supplied
through the meter are in operation.
3. Repeat 2 above with external controls set to maintain
low
fire.
4. If it is necessary to adjust either the high fire or low fire
pressures proceed as follows after removing the plastic
cover from the Modulating regulator.
Note: Minimum fire setting must be adjusted first after
which the high fire setting can be set. Any adjustment of
the minimum fire setting alters the maximum setting.
Minimum Setting
Disconnect electrical connection of modulating regulator
and turn burners back on and wait until the burner pressure has stabilised. Turn 9mm adjustment nut for low fire
pressure clockwise to increase and counter-clockwise to
decrease until the required pressure is obtained. Reconnect modulating regulator and check high fire pressure,
readjust if necessary.
Maximum Setting
Disconnect electrical connection of modulating regulator
and turn burners back on and wait until the burner pressure has stabilised. Push shaft gently downwards to the
maximum adjustment screw and hold there. Turn 7mm
adjustment nut for high fire pressure, clockwise to
increase and counter-clockwise to decrease, until the
required pressure is obtained. Release shaft. Repeat both
settings if necessary and then replace cover cap.
5. Turn off the main burner, disconnect the pressure
gauge and replace the sealing screw. Turn on the main
burner and test for gas soundness around pressure test
joint using a leak detection fluid. Replace access panel.
Fig 8 High/Low Regulator
Cover
Lever point
Hexagonal
adjustment screw for
maximum pressure
setting
Internal slotted
adjustment screw for
minimum pressure
setting
Fig 9 Modulating Regulator
‘O’ ring
Cap
Shaft
6.3mm AMP terminals
Adjustment nut (9mm)
for minimum pressure setting
Adjustment nut (7mm)
for maximum pressure setting
Page 17
VPC Range Users, Instrucons & Service Instrucons Issue 5.1 Sept 2014 Page 17
3.1 Technical Data
Table 3.1 Injector Sizes & Burner Pressure Natural Gas – Group H
– G20 Net CV (Hi) = 34.02MJ/m
3
Inlet pressure
20mbar
Inlet
INJECTORS
High Fire
Low Fire
Pressure Burner
Gas Rate
Burner
Gas Rate
20mb Pressure Pressure
MODEL No. Size Marked mbar m³/h mbar m³/h
mm
VPC30 6 1.94 194 13.8 3.45 4.6 1.9
VPC52 12 1.94 194 10.4 5.98 3.0 3.22
VPC80 12 2.54 254 8.1 9.19 2.1 4.44
VPC110 10 3.00 300 10.2 12.64 3.2 6.50
VPC130 12 3.00 300 10.0 14.94 3.6 8.26
2.5.6.2 Air Heater Controls
1. Close the gas service tap and ensure that the gas valve
is heard to close within 1 second and that the lockout light
is illuminated. Note that the heater will attempt three
reignitions before going to lockout. Open the gas service
tap and reset the unit from lockout.
2. Check that the room thermostat and all automatic
controls are operating satisfactorily.
2.5.7 Limit Thermostat - Honeywell
L4064B
NB. Ensure that the fan and limit settings are as follows:-
Fan ON - 122°F (50°C), Fan OFF - 86°F (30°C)
Limit Thermostat settings:VPC 30, 52 194°F (90°C)
VPC 80, 110, 130 248°F (120°C)
2.5.8 Handing over the Air Heater
Hand the Users Instructions to the user or purchaser for
retention and instruct in the efficient and safe operation of
the air heater and associated controls.
Adjust the automatic controls to those values required by
the User.
Finally, advise the user or purchaser that, for continued
efficient and safe operation of the air heater, it is important
that servicing is carried out annually.
In the event that the premises are not yet occupied turn off
the gas and electricity supplies and leave instructional
literature adjacent to gas meter.
Table 2 Specifications
MODEL
INPUT
(Nett)
OUTPUT
INPUT
(Nett)
OUTPUT
kg
kW kW m³/s Pa kW
VPC 30
32.6 30.0 18.0 15.7 0.8664
VPC 52
56.5 52.0 30.4 26.1 1.5884
VPC 80 87.0 80.0 42.0 36.8
2.3372
VPC 110
119.5
110.0
61.5 53.3 2.9568
VPC 130
141.3 130.0 78.1
69.0
3.6288
HIGH FIRE LOW FIRE
AIR
VOLUME
MAXIMUM
DUCT
RESISTANCE
FAN
MOTOR
WEIGHT
NOISE
LEVEL
dB(A) @ 3m
150 0.370 60.0 178
200 1.218 68.0 248
225 1.40 76.0
305
150 1.50 72.0 362
200 2.20
74.0 410
Page 18
Page 18 VPC Range Users, Instrucons & Service Instrucons Issue 5.1 Sept 2014
Table 3.2 Injector Sizes & Burner Pressure Propane – G31
Net CV (Hi) = 88.00MJ/m
3
Inlet pressure
37mbar
Inlet
INJECTORS
High Fire
Low Fire
Pressure Burner
Gas Rate
Burner
Gas Rate
20mb Pressure Pressure
MODEL No. Size Marked mbar m³/h mbar m³/h
mm
VPC30 6 1.36 136 21.7 1.33 7.0 0.74
VPC52 12 1.25 125 27.0 2.31 8.0 1.24
VPC80 12 1.55 155 24.1 3.55 6.0 1.72
VPC110 10 1.94 194 26.5 4.89 7.0 2.51
VPC130 12 1.94 194 25.0 5.78 7.9 3.19
Table 4 Electrical Loading
MODEL
START
AMPS
(A)
RUN
AMPS
(A)
VPC30
VPC52
0.80
1370
6.5
4.5
1.10
930
9.2
5.2
VPC80
3.00
930
20.0
11.4
VPC130
2.76 1420
40.0
10.7
ELECTRICAL
SUPPLY
POWER INPUT
(Kw)
NOMINAL
MOTOR R.P.M.
VPC110
1.93
1420
PLATE
AMPS (A)
28.0
9.3
230V 1N
3.3
3.1
11.5
9.4
14.05
VPC130
2.70
1420
25.1 4.5
VPC110
2.37
1420
17.5
3.4
3.5
4.8
230V 1N
230V 1N
230V 1N
230V 1N
400V 3N
400V 3N
FUSE
RATING
(A)
5
7
15
15
15
5
7
Page 19
VPC Range Users, Instrucons & Service Instrucons Issue 5.1 Sept 2014 Page 19
3.2 Short List of Parts
ITEM USAGE PART #
MFC 30 - 80 145035204
MFC 110, 130 141378715
Ignition Electrode 30 - 80 142423002
Ignition Electrode 110, 130 142423004
Rectification Electrode 30 - 130 142423003
Burner 30 - 80 142400240
Burner 110, 130 142400241
Fan & Limit Thermostat All 143000306
Control Box All 145030844
Hi/Lo Governor Head 10-140 -/HL 142466402
Modulating Governor Head 10-140 -/MOD 142466403
Modulating Driver 10-140 -/MOD 142400303
Only original specified parts may be fitted as service replacements. Please refer to Powrmatic
Ltd for any parts not detailed in the lisitng below.
Page 20
Page 20 VPC Range Users, Instrucons & Service Instrucons Issue 5.1 Sept 2014
Exhaust Fan 30,52 140210499
Exhaust Fan 80 - 130 140201505
Pressure Switch 30, 52 146522174
Pressure Switch 80 - 130 142961107
Contactor All 143000610
Page 21
VPC Range Users, Instrucons & Service Instrucons Issue 5.1 Sept 2014 Page 21
4.1 Servicing
WARNING: Always switch off and disconnect
electricity supply and close the gas service valve
before carrying out any servicing work or
replacement of failed components.
NOTE:
If a suspended air heater is to be serviced do not
lean ladders against the heater. Ensure that an
access tower or equivalent is used.
4.1.1 General
Full maintenance should be undertaken not less than
once per year by a qualified person. After any servicing
work has been complete or any component replaced the
air heater(s) must be fully commissioned and tested for
soundness as described in Section 2.5.
4.1.2 Main Burner Assembly Removal
1. Ensure that the gas service valve is turned OFF and
then unscrew the union nut situated immediately downstream of it.
2. Disconnect the spark and rectification leads from the
P.C.B. and remove the electrical plug connections from
the top of the gas control valve assembly.
3. If required remove the manifold by first removing the
front heat shield and then removing the four screws
securing the manifold to the burner assembly.
4. Remove the two screws that secure the top of the
burner assembly to the bulkhead and lift out burner
assembly
5. Using a stiff brush, not a wire brush, brush the burners
to dislodge accumulated deposits. Inspect the burners
both internally and externally to ensure that they are
clean. Examine the injectors and if damaged or deteriorated, replace with new ones of the correct size and
marking. If deemed necessary, clean the injectors. Do
not broach out with wire.
6. Reassemble the injectors, manifold and burners in
reverse order to that above.
4.1.3 Ignition and Rectification Electrodes
1. Inspect the electrodes, making sure that they are in a
sound and clean condition. In particular check that the
ignition electrode is clean and undamaged. Check that
the spark gap is 2.5mm.
Fig 10 Ignition and Rectification Electrodes
4.1.4 Heat Exchanger
Whilst the main burner assemblies are removed from the
unit check that the primary sections that the burners fire
into are clean.
4.1.5 Main Fan Assembly
Inspect the fan blades to see that they are not damaged
and that there is no excessive build up of deposits that
could give rise to an imbalance.
4.1.6 Replacement of Faulty Components
4.1.6.1 Multifunctional Control
1. Remove the electrical plug connections from the top of
the gas control valve assembly
2. Release the flanged connections at the inlet and outlet
of the multifunctional control and remove the multifunctional control.
3. Reconnect the new valve in the reverse order to that
above ensuring that the valve is correctly orientated.
Renew the sealing 'O' rings if necessary.
4.1.6.2 Burners
1. Remove the burner assembly as previously described
in Section 4.1.2.
2. Remove the end plates of the burner assembly and
the central burner support plate.
3. Exchange burners as required and reassemble components in reverse order.
4. Re-commission the appliance as described in Section
2.5.
4.1.6.3 Electrode Assemblies
1. Disconnect the electrode leads from the P.C.B. terminal as appropriate.
2. Remove the screw securing the electrode assembly to
the burner assembly side plate and withdraw the assembly.
3. Fit replacement and reassemble in reverse order.
Check that the spark gap is 2.5mm (See Fig. 10).
4.1.6.4 Limit Thermostat - Honeywell
L4064B
1. Squeeze the sides of the cover and remove cover by
pulling forward.
2. Release wiring from clamp terminals by pushing a small
screwdriver into the clamp release holes adjacent to the
clamps.
3. Remove the 2 screws securing the thermostat to the
heater panel and withdraw thermostat.
4. Reassemble new unit in reverse order referring to the
heater wiring diagram to ensure correct wiring location.
To release the mechanical limit push a pointed object into
the small hole at the top of the dial. At the same time
prevent the dial from rotating and push the limit tempera-
ture adjuster around to the required setting.
2.5mm
Page 22
Page 22 VPC Range Users, Instrucons & Service Instrucons Issue 5.1 Sept 2014
4.1.6.4 Limit Thermostat - Honeywell
L4064B
1. Squeeze the sides of the cover and remove cover by
pulling forward.
2. Release wiring from clamp terminals by pushing a small
screwdriver into the clamp release holes adjacent to the
clamps.
3. Remove the 2 screws securing the thermostat to the
heater panel and withdraw thermostat.
4. Reassemble new unit in reverse order referring to the
heater wiring diagram to ensure correct wiring location.
Important: A replacement fan/limit thermostat may
have a brass link between the bottom fan terminal
and the bottom limit terminal (situated in the slot
between the two terminals). This MUST be
removed, by breaking the link off using a pair of
thin nose pliers, before the replacement thermostat is installed.
Fig 11 Thermostat Fan / Limit – Honeywell L4064B
Note: The new L4064B may be supplied with the
limit temperature mechanically limited to less than
the setting required.
To release the mechanical limit push a pointed object into
the small hole at the top of the dial. At the same time
prevent the dial from rotating and push the limit temperature adjuster around to the required setting.
4.1.6.5 Exhaust Fan
1. Disconnect the flexible pipe from the fan outlet.
2. Disconnect fan electrical connections from the terminals on the P.C.B.
3. Remove the fan and fan mounting plate from the
bulkhead (4 screws).
4. Fit replacement exhaust fan, using new gaskets, and
reassemble in reverse order.
4.1.6.6 Air Pressure Switch
1. Disconnect electrical connections.
2. Pull off the sensing tube from the air pressure switch.
3. Remove the screws fixing the air pressure switch and
remove switch.
4. Fit replacement in reverse order refitting the sensing
tube to the negative (- or L) tapping on the pressure
switch.
4.1.6.7 Control Box
1. Unplug all the electrical connections.
2. Remove the four screws that secure the control box in
place.
3. Fit replacement in reverse order.
4.1.6.8 Main Air Fan(s)
1. Remove the lower side panels.
2. Disconnect the fan motor electrical lead from the
controls.
3. Remove the screws securing the fan to the fan shroud
and slide fan out. Note that the fans on the VPC110 and
135 are removed through the rear of the heater.
4. Fit replacement in reverse order.
Page 23
VPC Range Users, Instrucons & Service Instrucons Issue 5.1 Sept 2014 Page 23
4.2 Fault Finding
Note: APS = Air Pressure Switch
Check Fuse ‘L’
Gas & Electrical supplies present at heater?
No
Turn supplies on, Check fuses/connections
230V Between 1 & 2 on Brahma control?
Limit thermostat tripped (red lamp on front panel on)?
Check fuse on Brahma control
Press reset switch on front panel when unit is cool
If it will not reset when cold - check/change thermostat, check limit interlock relay operation
Yes
No
Unit at lockout (lockout lamp on low level controls
and on internal control panel alight)?
No
Check for 230V at terminal 19
Yes
Replace (3.15A), ascertain cause of failure and rectify
Replace (4A), ascertain cause and rectify
Failed
Failed
Check for faulty connection. Replace as necessary.
Yes
START
OK
OK
Yes
Yes
No
Check APS sensing tube. Check negative pressure developed by exhaust fan. Adjust APS set point. Change APS
Yes
Yes
Ignition sparks?
Check/replace ignition probe/lead. Faulty Brahma control box
Yes
Burners light?
Check ignition electrode position. Is gas pipe work purged of air? Check gas pressures. Replace gas valve
Check rectication probe/lead. Faulty Brahma Control
4 more ignition attempts then lock out.
Exhaust fan continues to run APS has lost C. to N.O. continuity, slightly reduce APS set point.
Check for 230V between terminals 7 & 15 of the terminal strip
Absent
Replace motor, capacitor or fan/motor assembly
Check connections, overloads etc as applicable
Absent
Finish
Burners remain alight?
Check for 230V between terminals
12 & 11 of the terminal strip
Check connections, Faulty Brahma Control
Yes
230V at APS Terminal C ?
Present
230V at APS Terminal N.O ?
No
Check for 230V between terminals 13 & 14
of the terminal strip
Check connections, Faulty Brahma Control
No
Faulty Gas Valve
Yes
No
No
No
No
Main fan runs?
Main fan running - wait for unit temperature to reduce - Press reset switch on front panel.
If it will not reset when cold - change thermostat, check limit interlock relay operation
Check for 230V at terminal 1 of terminal strip
Absent
Absent
Absent
Absent
Absent
External control circuit not calling for heat
Press lockout reset button on low level controls or on internal control panel
Continuity between APS C and NO connections - check
for reason, adjust APS setting or change APS. Faulty
Brahma control or connections.
Check connections, Faulty exhaust fan and/or capacitor
Yes
Yes
Yes
Exhaust fan runs?
No
Yes
Yes
Gas valve opens?
Depending on fan /motor type - Check for 230V at
the main fan motor
Check connections. Fan/limit
thermostat faulty - check/replace
Present
Present
Page 24
Page 24 VPC Range Users, Instrucons & Service Instrucons Issue 5.1 Sept 2014
HEATING DIVISION
Hort Bridge
Ilminster, Somerset TA19 9PS
Tel: 01460 53535
Fax: 01460 52341
Every effort is made to ensure accuracy at time of going to press. However as part of our policy of continued product
improvement, we reserve the right to alter specification without prior notice.
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