Ambirad UPA 30 Guide

0710UPA-AMEN
UPA 30 - 90
Gas-fired fan assisted flue unit heater
INSTALLATION
COMMISSIONING
SERVICING
TheseappliancesmeetthefollowingECDirectives:
DIR CE 90/396/EEG:GAD
DIR CE 89/336/EEG:EMC
DIR73/23/EEG:LVD
DIR89/392/EEG:MD
Pleasereadthisdocumentcarefullybeforecommencinginstallation,commissioningand/orservicing.
Leave it with the user or attached to the appliance or gas service meter after installation.
WARNING:
Improperinstallation,adjustment,alteration,serviceormaintenancecancausepropertydamage,injuryordeath.
Allwork must be carried out byappropriatelyqualifiedpersons.
Themanufacturerdoesnottakeanyresponsibilityintheeventofnon-observanceoftheregulationsconcerningthe
connectionoftheapparatuscausinganeviloperationpossiblyresultingindamagetotheapparatusand/orenviron-
ment in which the unit is installed.
Ambi-Rad Limited, Fens Pool Avenue, Brierley Hill, West Midlands DY5 1QA (United Kingdom)
Tel : [phone] Fax : [phone]

0710UPA-AMEN, Pag. 2/33
INDEX
Warnings ......................................................................................................................... 3
1. General...................................................................................................................... 4
2. Installation codes ...................................................................................................... 4
3. Warranty.................................................................................................................... 4
4. Uncrating and preparation......................................................................................... 4
5. Dimensions ............................................................................................................... 5
6. Technical data ........................................................................................................... 6
7. Flueing requirements ................................................................................................. 7
8. Unit heater location ................................................................................................... 10
9. Hanging the unit ........................................................................................................ 11
10. Gas piping and pressures.......................................................................................... 13
11. Electrical supply and connections............................................................................. 14
12. Check installation and start up .................................................................................. 16
13. Maintenance schedule ............................................................................................... 21
14. Heat exchanger maintenance ..................................................................................... 22
15. Burner maintenance ................................................................................................... 23
16. Burner orifice ............................................................................................................ 25
17. Ignition system .......................................................................................................... 25
18. Fan motor ................................................................................................................. 26
19. Fan motor, fan blades and guard .............................................................................. 26
20. Venter motor and wheel ............................................................................................ 27
21. Gas valve...................................................................................................................28
22. Combustion air pressure switch................................................................................ 29
23. Limit controls ............................................................................................................ 29
24. Flue and combustion air system ............................................................................... 30
25. Troubleshooting ........................................................................................................ 30
26. Parts list .................................................................................................................... 33

0710UPA-AMEN, Pag. 3/33
FOR YOUR SAFETY
What to do if you smell gas:
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your
building.
• Immediately call your gas supplier.
• Evacuate all personnel.
WARNINGS
FOR YOUR SAFETY
Do not store or use petrol or other flammable vapours and liquids in the
vicinity of this or any other appliance.
WARNING: Improper installation, adjustment, alteration, service or
maintenance can cause property damage, injury, or death. Read the
installation, operation, and maintenance instructions thoroughly before
installingor servicing thisequipment.
WARNING: Gas-fired appliances are not designed for use in hazourdous
atmospheres containing flammable vapours or combustible dust, in
atmospheres containing chlorinated or halogenated hydrocarbons or in
applications with airborne silicone substances.
WARNING: Should overheating occur, or the gas supply fail to shut off,
shut off the manual gas valve to the appliance before shutting off the
electricalsupply.
WARNING : Do not use this appliance if any part has been immersed in
water. Immediately call a qualified service technician to inspect the
appliance and replace any gas control that has been immersed in water.

0710UPA-AMEN, Pag. 4/33
3. Warranty
4. Uncrating &
preparation
Warranty is void if :
a. Wiring is not in accordance with the diagram furnished with the heater.
b. The unit is installed without proper clearances as soon as clearances are
required regardless of the material being combustible .
c. A fan model is connected to a duct system or if the air delivery system is
modified.
These units must be installed in accordance with BS6230 or BS5440 as appropriate
plusall local buildingcodes.
1. General Models UPA30 through 90 are design certified to the CE EN1020 standard for use in
industrialand commercial installations only.All models and sizes are available for use
with either natural or propane gas. The type of gas, the input rate and the electrical
supply requirement is shown on the heater rating plate. Check the rating plate to
determine if the heater is appropriate for the intended installation.
This installation manual is shipped with the heater. Verify that the literature is correct
for the heater being installed. If the manual is incorrect for the heater, contact the
supplierbefore beginning installation.
The instructions in this manual apply only tothe models listed.
Installation should be done by a suitable qualified installer in accordance with these
instructions. The installer is responsible for the safe installation of the heater.
2. Installation
codes
This unit was test operated and inspected at the factory prior to crating and was in
proper operating condition. If the heater has incurred damage in shipment, document
the damage with the transport company and contact your supplier.
Check the rating plate for the gas and electrical specifications of the heater to be sure
that they are compatible with the gas and electric supplies at the installation site.
Readthis bookletand become familiar with theinstallation requirements of your heater.
If you do not have knowledge of local requirements, check with the gas supplier and
any other local agencies who might have requirements concerning this installation.
Before beginning, make preparations for necessary supplies, tools, and manpower. If
the installation includes optional vertical louvers or downturn nozzle etc .
install these options before the heater is suspended. Follow the instructions
included in the option package.

0710UPA-AMEN, Pag. 5/33
5. Dimensions & Clearances (horizontal orientation=standard)
Topview
Frontview
Legend:
1. Combustion air inlet
2. Flue connection
3. External gas connection
4. Electrical connections
5. Service panel
Rear view (mod. 40&50)
Side view
Rear view ( mod. 30, 60, 70 & 90)
Figure 1
TypeABCDEFGHJ KMNPQ
30 588 702 516 404 774 549 368 193 222 124 413 17 98 350
40 512 975 440 601 1132 900 372 195 126 166 622 37 150 600
50 512 975 440 601 1152 900 372 195 126 166 622 37 150 600
60 665 975 593 601 1141 900 355 207 145 166 622 37 150 600
70 665 975 593 601 1141 900 355 207 145 166 622 37 150 600
90 868 1045 796 651 1141 900 564 213 300 187 672 37 150 600
Table 1 : Dimensions (mm)

0710UPA-AMEN, Pag. 6/33
Clearances (mm) Units must be installed so that the minimum clearances in the following table are
provided for combustion air space, inspection and service and for proper spacing
from combustible materials.
Attention :
The clearance distance from
the flue system must be
minimum150mm at all points!
Flue system diameters
Diameter gas
connection
Table 2 : Clearances (mm)
Table 3 :
Model 304050607090
Diaflue/airinlet(mm) 100 100 100 130 130 130
Diagas connection 1/2" 3/4" 3/4" 3/4" 3/4" 3/4"
Model X Y Z (*) U V
30 450 50 50 50 850
40 -90 450 100 100 100 850
6. Technical data
Table 4
Type 30 40 50 60 70 90
Gas category
Comb. air & flue, type B instal.1
Flue & combustionairconnectioncollars mm 100 100 100 130 130 130
Heat input (Hs) kW 32,74 48,28 59,71 68,15 82,13 109,88
Heat input (Hi) kW 29,50 43,27 53,80 61,40 74,00 99,00
Heat output kW 27,18 39,87 49,22 56,80 68,64 90,75
Thermalefficiency % 929292929292
Gas consumption rate
nat. gas G20 m3/h 3,12 4,60 5,69 6,50 7,83 10,48
prop.G31 kg/h2,303,394,204,795,777,72
Gas connectionsize (not supplyline size) 21/2" 3/4" 3/4" 3/4" 3/4" 3/4"
Temperaturerise K 333032302930
Airflow m3/h 2385 3885 4535 5540 6810 8825
Motorspeed rpm 950 950 950 950 1425 950
Suggested mounting height 3m 3,5 3,5 3,5 3,5 4,0 4,0
Electrical service (protection classIP20)
Total electricalrating W 273 333 490 490 677 848
Weight(net) kg 56 93 104 114 123 163
II2H3+
B22
230/240V 1N ~ 50Hz
1) Gas Appliance Classifications for Approved Venting Methods based on CEN-report CR1749:2001
2) There is a difference between the gas connection diameter and the diameter of the supply line. Always use the most adequate dia of the supply
line to minimize the pressue drop through the gas pipes - if necessary, reduce the diameter of the supply line at the inlet of the unit.
3) Height from floor to bottom surface of heater. These are recommendations only. Positioning of unit heaters for proper performance is
application dependent. Operation is affected by other air moving equipment in the space, obstructions to the airflow, draughts and/or close
proximity to doors or windows, etc ... Care should be taken to avoid mounting the heaters above thse recommendations, unless downturn nozzle
options are used, as significant stratification may occur resulting in poor floor coverage and higher energy losses through the roof structure.
(*) : Heaters can be base mounted on suitable non combustible supports.

0710UPA-AMEN, Pag. 7/33
7. Flue
requirements Model UPA heaters may only be installed as Type-B installations.
Flue must be in accordance with BS6230 or BS5440. Local requirements may
apply in addition to national requirements. These unit heaters are designed to
operate safely and efficiently with either a horizontal or vertical flue system when
installed with the specific requirements and instructions .
If this heater is replacing an existing heater, be sure that the flue is sized properly
for the heater being installed and that the existing flue is in good condition. A
properlysizedflue systemis required forsafe operationofthe heater.Animproperly
sized flue system can cause unsafe conditions and/or create condensation.
The air heaters may only be installed as a power vented heater (type B) (the
combustion air is taken from the space where heater is installed), which requires
only a flue pipe exhausting to outdoors.
All products of combustion must be flued to outdoor atmosphere.
Each heater installed as a type B appliance must be fitted with an individual flue
pipe and the combustion air inlet opening is provided with a protection grill.
Flue pipe diameters and maximum pipe lengths in table 5 apply to both horizontal
and vertical systems. Add all straight sections and equivalent lengths for elbow.
The total combined length must not exceed the maximum flue length.
Diameter & maximum
flue pipe lengths
IMPORTANT :
The flue must be installed in accordance with national and local
regulations. Failure to provide proper flueing could result in death, serious
injury and/or property damage. The air heater must be installed with a
flue to the outside of the building. Safe operation of any power vented
gas apparatus requires a properly operating flue system, correct provision
for combustion air and regular maintenance and inspection.
Table 5 : Maximum flue pipe lengths
Model UPA 30/40/50 60/70/90
Heater socket & pipe dia mm flue pipe 100 130
Max. straight length m flue pipe 14 14
Equivalent length of 45° elbow m flue pipe 0,75 0,75
Equivalent length of 90° elbow m flue pipe 1,50 1,50
• Use only one diameter of flue pipe on an installation.
• Minimum flue is 1m.

0710UPA-AMEN, Pag. 8/33
Flues for power
vented installations
(type B appliances)
Approved appliances type B
Figure2 : B22 - roof
Flue outlet Venteroutlet attachmentrequirements:
Depending on the size of the flue pipe as determined in table 5, attach either the
flue pipe directly to the collar or a taper-type connector.
Figure3 : B22 - wall
If the air heater is to be installed as a type B appliance, air for combustion will be
taken from within the space where the heater is installed. Ensure that an adequate
airsupplyforcombustion andventilationisprovidedwithinthebuildinginaccordance
with BS6230/BS5440 plus other relevant regulations and rules in force.
Single wall flue seamless aluminium or stainless steel pipes are required.All joints
mustbe sealed to prevent products of combustion from leaking into the building. If
the flue passes through a combustible element of the building it must be enclosed
byasleeve of non-combustiblematerial and separatedfrom the sleeveby a minimum
of 25 mm air break. The temperature of any combustible material near to the flue
must not exceed 65°C when the heater is in operation. The flue must be at least
150 mm away from any combustible material.
Single wall flue pipe exposed to cold air or run through unheated areas should be
insulated. Where condensation is unavoidable, provision must be made for the
condensation to flow freely to a point to which it can be released, i.e. a drain or
gully.Thecondensation drain fromthe fluemust be constructedfrom non-corrodible
material not less than 20 mm diameter. Copper or copper based alloys must not be
used for condensation drains.

0710UPA-AMEN, Pag. 9/33
Air supply
WARNING:
When these air heaters are
installed in type B applica-
tions,designedtotakeairfor
combustionfromthespacein
which it is installed. Do not
restrict the combustion air
intake.
It is important to ensure that there is an adequate air supply at all times for both
combustion and heating requirements. Modern buildings involve greater use of
insulation, improved vapour barriers, and weather proofing. These practices mean
that buildings are sealed much tighter than in the past.
Proper combustion air supply for a power vented Type B installation requires
ventilation of the heated space. Natural infiltration of air may not be adequate. Use
of exhaust fans aggravates this situation. It is important to ensure that there is
adequate combustion air supply at all times. Reliance on doors and windows is not
allowed.
Always ensure that adequate combustion air is provided to suit the total
installation of all combustion equipment in accordance with BS6230 or BS
5440 as appropriate.
Ensure that the air combustion inlet opening at the rear side of the unit cannot be
obstructed (cfr. fig. 4 & 5).
Type B appliances : Combustion air & flue pipe sockets
Figure4
Mod.40&50 Figure5
Mod. 30, 60, 70 & 90

0710UPA-AMEN, Pag. 10/33
Thepresence of chlorinevapors inthe combustionair of gas-firedheating equipment
presents a potential corrosion hazard. Chlorine, found usually in the form of freon
or degreaser compounds, when exposed to a flame will precipitate from the
compound, and go into solution with any condensation that is present in the heat
exchanger or associated parts. The result is hydrochloric acid which readily attacks
all metals. Care should be taken to separate these vapours from the combustion
process. This may be done by wise location of the unit flue and combustion air
terminalswith regard to exhausters or prevailing winddirections. Chlorineis heavier
than air. Keep this fact in mind when determining installation location of the heater
inrelation to buildingexhaust systems.Where chlorinevapours are prevalentheaters
with special grade 316 A1S1 stainless steel heat exchangers are recommended.
Hazards of Chlorine -
apply to the location
of the combustion air
inlet
8. Location heater
Remark:
Flue requirements may
affect location. Consult
section 7 before making
a final determination.
WARNING:Iftouched, theventpipe andinternal heatersurfacesthat
are accessible from outside the heater will cause burns. Suspend the
heatersuch thatthesecomponents cannotbe touched.
Use the minimum clearances and venting table in section 5 and the throw data in
the technical data table of section 6 when determining where to suspend the heater.
CAUTION : Do not locate the heater where it may be exposed to water.
Recommended minimum height is 2.5m.
For best results, the heater should be placed with certain rules in mind. Always
ensure that minimum clearances are obtained. Locating a unit heater above the
maximum recommended height can result in significant air stratification. When
possible, heaters should be arranged to blow toward or along exposed wall surfaces.
Suspended heaters are most effective when located as close to the working zone
aspossible, but care should beexercised to avoid directing thedischarged air directly
on to room occupants.
Partitions,columns, counters, orother obstructionsshould be taken into consideration
whenlocating the unit heater so that a minimum quantity of airflowwill be deflected
by such obstacles.
When units are located in the centre of the space to be heated, the air should be
discharged toward the exposed walls. In large areas, units should be located to
dischargeair alongexposed walls with extra units provided todischarge airin toward
the centre of the area. For optimum results heaters are best used in conjunction
with recirculating air fans suspended at high level.
At those points where infiltration of cold air is excessive, such as at entrance doors
and shipping doors, it is desirable to locate the unit so that it will discharge directly
toward the source of cold air, typically from a distance of 4.5 to 6.0 meters or install
a downflow unit over the door opening.

0710UPA-AMEN, Pag. 11/33
9. Hanging
the heater
Warning : Do not place or add additional weight to the suspended heater.
Before suspending the heater, check the supporting structure to verify that it has
sufficient load-carrying capacity to support the weight of the unit.
WARNING:
Checkthesupporting
structuretoverify thatit
hassufficientload-carrying
capacitytosupportthe unit
weight.Suspend theheater
onlyfromthethreadednut
retainersorwith a
manufacturerprovidedkit.
DONOT suspendfromthe
heatercabinet panels.
Be sure that the threaded hanger rods are locked to the heater as illustrated in
figure 6. Recommended maximum hanger rod length is 1.8m. Where longer drops
are required, ensure that restraints are fitted to prevent excess lateral movement
and supports are adequately sized.
Leave the unit on the pallet. If the bottom of the unit is not supported or protected
damage can occur.
Figure 6 : Suspending the heater with rods from the threaded nut retainers
Add a nut (4x) to lock the M10x1.5 hanger
rod to the heater
Table 6 : weights (kg)
The heater is supplied with four point suspension. All points must be used. Two
threaded nut retainers are provided on each side of the top of the heater. See
figure 6 for hanger rod size.
Size 30 40 50 60 70 90
kg 56 93 104 114 123 163
Detail

0710UPA-AMEN, Pag. 12/33
Figure 7 :
Wall bracket kits (optional)
Type 30
When desired the heaters may be supported by wall brackets. Supporting in this
mannerallows theheaters tobe placed in close proximity to theceiling ormounted
directly to the vertical supporting structures of the building. There are 2 different
wall bracket designs for UPA models as shown in the illustrations below.
Mounting instructions are detailed in the literature supplied with these optional
kits
Types 40 - 90

0710UPA-AMEN, Pag. 13/33
Warning : This appliance is equipped for a maximum gas supply pressure
of 50 mbar.
WARNING : Pressure testing supply piping
Test pressures above 50mbar : Disconnect the heater and manual valve from
the gas supply line which is to be tested. Cap or plug the supply line.
Test pressures below 50mbar : Before testing, close the manual valve on the
heater.
10. Gas Piping and
pressures
All piping must be in accordance with requirements outlined in the National Gas
Codes (different for each country). Gas supply piping installation should also
conform with good practice and any local codes. Support gas piping with pipe
hangers, metal strapping, or other suitable material. Do not rely on the heater to
support the gas pipe.
Allsealing products shall be resistant to the action of liquefied petroleum gas or any
other chemical constituents of the gas being supplied.
Install a ground joint union and manual shutoff the gas cock upstream of the unit
control system.
Theunitisequipped withanipplethat extendsoutsidethecabinet. Thegasconnection
is 1/2” or 3/4”, dependent on the size of the unit.
Leak test all connections by brushing on a leak detecting solution.
WARNING:Allcomponents
of a gas supply system must
be leak tested prior to
placing equipment in
service.NEVERTESTFOR
LEAKS WITH AN OPEN
FLAME. Failure to comply
could result in personal
injury, property damage or
death.
Diameter gas connection
Figure 8 : gas connection
WARNING : Do not over
tighten and rotate the gas
valveinsidetheheatercontrol
compartment.
Table 7 : diameter gas connection Type 30 40 50 60 70 90
Nat gas G20 1/2 3/4 3/4 3/4 3/4 3/4
Prop G31

0710UPA-AMEN, Pag. 14/33
11. Electrical
supply and
connections
The electrical installation may only be carried out by an appropriately qualified
person current to IEE Regulations. The supply line to the heater should include a
main switch. The minimum clearance distance between the contacts must be more
than 3mm.
The electrical installation may only be carried out by appropriately qualified
persons observing the rules in force. The supply line to the heater should include
a main switch. The minimum clearance distance between the contacts must be
more than 3 mm.
All electrical connections should be made in the heater control compartment
(refer to figure 9). Screw type terminals are provided. Connections should be in
accordance with the terminal markings and the wiring diagram affixed to the air
heater.
Attention :
Serious damage can occur to burner relay when faulty connection of thermostat,
reset switch or burner failure lamp.
The minimum external control required for the air heater is a room thermostat.
It is essential that the main input line and neutral to terminals L and N
remain live at all times even when the heater is switched off to ensure
correct operation of the unit.
A burner reset switch with red indicator light is fitted on the heater. To add a
remote reset button, make connections to the terminals in the electric box as
indicated on the wiring diagram.
IMPORTANT: If the reset button requires activating for any reason, the
cause must be determined. After determining and correcting the
problem, restart the heater and monitor long enough to ensure proper
operation (approx. 5 minutes).
Ensure that all cables and installers wiring are fixed to the gas pipe and that they
do not touch the combustion collector box.
DANGER :
THIS APPLIANCE
MUST BE
EARTHED.
Thermostat location Do not attempt to control more than 1 air heater from a single
thermostat or control panel unless a properly wired relay is fitted.
Follow the instructions supplied with such panels.
The location of the room thermostat or sensor is very important. It should not be
positioned on a cold wall or cold surface. Avoid location in draughty areas or
where it may be influenced by heat sources e.g. the sun, process plant, etc. The
thermostat should be mounted on a vibration free surface and mounted about 1,5
metres above floor level. Follow the thermostat manufacturers instructions. The
thermostat must be suitable for potential free contacts.

0710UPA-AMEN, Pag. 15/33
Figure 9 :
Wiring connections on the
terminal board
Legend : r = red bl = blue y = yellow
gr = green br = brown o = orange
b = black
8
b
y
12
11
9
10
o
gr
y/gr
br
bl
r
N
J2
6
7
5
4
J1
3
N
1
L
S0
F0
16AT
N
PE
230V
L

0710UPA-AMEN, Pag. 16/33
12. Check
installation
&
start-up
Check the instal-
lation prior to
start-up
Heater start-up


Check suspension. Unit must be secure.Verify that no other parts are
fitted which are not individually supported and secured.


Check clearances from combustibles. Requirements are in section 5.


Checkventsystem tobesure thatitis installedaccordingto theinstructions
in section 7, venting requirements.


Check piping for leaks and proper gas line pressure. Bleed gas lines of
trapped air.


Check electrical wiring and ensure that wiring conforms with the wiring
diagram. Be sure all wire sizes meet requirements.


Check polarity. Verify that line voltage exists between the black “L1”
and earth ground.


Verify that the appliance is earthed by conducting an earth continuity
test.
WARNING:
For your safety, follow the instructions exactly otherwise damage
or injury could occur.
•This heater does not have a pilot flame. It is equipped with an ignition
device which automatically lights the burner. Do not try to light the
burner by hand.
•Before operating, smell all around the heater area for gas. Be sure to
smell next to the floor because propane gas is heavier than air and will
settle near the floor.
•Do not use this appliance if any part has subjected to water ingress.
Immediately call a qualified service technician to inspect the appliance
and to replace any part of the control system and any gas control.
•When overheating occurs or when gas supply is not turned off, shut
the manual gas tap before turning off the electric power.

0710UPA-AMEN, Pag. 17/33
Operating instructions
and operating sequence 1. Set thermostat to the lowest setting.
3. Shut the gas cock at the inlet of the unit.
4. Wait five (5) minutes to clear out any gas. Then smell for gas, including
near the floor. If you smell gas, STOP! and follow the steps in the
WARNINGS printed on page 3. If you do not smell gas, proceed to the
next step.
5. Turn on the electric power to the heater.
6. Open the gas cock at the inlet of the unit.
7. If fitted, ensure that a time switch is set to an ‘ON’ period.
8. Adjust the thermostat to the required setting (must be above current room
temperature).
Note :
If the appliance does not operate, follow the instructions "To turn off gas
supply at theAppliance" printed below and call your service technician.
9. Thermostat calls for heat, energyzing the venter motor.
10. When adequate air flow for combustion is proven by an air proving switch
and a prepurge period has elapsed, the integral ignitor and multifunctional
gas control operate. The ignition spark ignites the gas creating the burner
flame.
11. Burner flame is sensed by a flame rod sensor and when the heat ex-
changer is warmed up (+/- 30 seconds) and the fan control relay closes,
the fan motor is energized.
12. If the flame is extinguished during the main burner operation, the inte-
grated control system closes the main valve and attempts to relight the
burner. The unit will attempt 5 ignitions before entering a “lock out” mode.
Lock out is indicated by the red warning light on the heater. To end this
mode push on the reset switch.
13. To turn the heater ‘OFF’for short periods : adjust the room thermostat to
its lowest setting or ‘OFF’. The fan will continue to run to cool the heater
and then switch off automatically.
14. To turn the heater ‘OFF’ for long periods : see ‘To turn off gas supply at
the appliance’below.
TO TURN OFF GAS SUPPLY AT THE APPLIANCE
1) Set thermostat to the lowest possible setting or ‘OFF’ position.
2) Shut off the gas tap when the fan has stopped.
Check installation after
start-up


Check gas pressure as described in detail below.


Turn the unit off and on, pausing 2 minutes between each cycle. Observe for
smoothignition.


Set the thermostat to the required room temperature.


Place this booklet and any control or optional information in an accessible
location near the heater or give this information to the end user.
2. Turn off all electric power to the heater.
3) Switch off electric power to the appliance.

0710UPA-AMEN, Pag. 18/33
Burner gas pressure
adjustment The gas pressure is set for the required heat input before the appliance leaves the
factory. Provided that the gas supply to the air heater is in accordance with the
supply pressure described on the appliance data plate, the operating pressure will
not require adjustment. To check the pressure use the following procedure:
* Ascertain from the heater’s data plate the correct operating gas pressure;
* Turn the room thermostat control to its lowest setting;
* Remove the screw from the burner pressure test point of the multi-functional
control valve. Connect a manometer to the test point( see figure 10a & 10b);
* Adjusttheroom thermostatto call forheat i.e.aboveroom ambienttemperature;
* Observethe burner gas pressure on the manometer andcompare to the required
pressure on the data plate;
* If necessary, adjust the burner gas pressure. Remove the cover screw (models
40 - 90) or cover cap (model 30). Turn the regulator screw anti-clockwise to
decrease pressure or clockwise to increase pressure (see figure 10a & 10b);
* Set room thermostat to lowest setting to turn OFF the burners. Replace the
test point screw/cap and with the main burner OFF, test for gas soundness
using a leak detector fluid.
Reset temperature control/room thermostat to comfort operating level.
Figure 10a : HONEYWELL gas valve (type 30)
Legend
1) Shut-off solenoid valve EV1
2) Pressure regulator setting device, or, alternatively, outlet flow setting screw
3) Inlet pressure test point
4) Outlet pressure test point
5) Shut-off solenoid valve EV2
6) Pilot outlet
7) Main gas outlet
8) Holes (M5) for fixing flanges
1
2
6
5
3
48
7

0710UPA-AMEN, Pag. 19/33
Figure 10b : HONEYWELL gas valve (types 40 - 90)
Legend
1) Gas inlet
2) Gas outlet
3) Inlet pressure tap
4) Outlet pressure tap
5) 6.3mm AMP terminals and screws for wiring
6) 6.3mm AMP terminals
7) Earth terminal/screw (line voltage models only)
8) Pressure regulator adjustment screw
Table8 : Burner jets and pressures
Mod. 30 40 50 60 70 90
Burner jet dia5,905,906,507,108,008,90
Burner pressure mbar 7,80 9,20 10,40 9,50 9,10 9,20 inlet pressure
20mbar
Burner jet dia2,653,253,653,904,305,10
Burner pressure mbar 36,60 35,40 35,20 34,70 34,40 34,00 inlet pressure
37 mbar
Natural gas
(G20)
Propane gas
(G31)
Minimum inlet pressure natural gas G20 : 16,6mbar
Minimum inlet pressure propane gas G31 : 35,2 mbar
2
6
3
1
4
57
8

0710UPA-AMEN, Pag. 20/33
Definitions
Start position: The system is not in lock-out position and can proceed with the start-up sequence upon a demand for heat.
Pre-purge time: This is a period of 20 seconds during which the combustion fan (venter) operates prior to activation of the ignition
device.
Safety time: The safety time is the delay between the gas valve being energised and the flame sensor checking for the presence of
a flame. This is a period of 5 seconds.
Note: If no flame is sensed, the burner relay will attempt ignition 5 times before going into lock-out mode.
Post-purge time: This is the time of 10 seconds between burner shut-down and the moment the combustion fan (venter) is de-
energized.
Normal Heat
Cycle Operating
Sequence
IgnitionIgnition
IgnitionIgnition
Ignition
systemsystem
systemsystem
system This heater is equipped with a direct spark integrated control relay. The control
relay monitors the safety devices and controls the operation of the venter motor
and the gas valve between heat cycles.
The time line below illustrates a normal heat cycle.
Start pre-purge
Energisation of venter motor.
If the differential pressure switch
is in normally closed position
(start position).
Power to gas valve and ignitor
Sensor checks for the presence of a flame
End of heat demand.
De-energisation of gas valve.
De-energisation of venter motor
First heat demand signal.
Check on pressure switch.
Must be in closed or start position.
If not, there will be no power to
the venter motor.
The power to the burner relay is off
until the pressure switch goes to
normally closed - or start position.
Safety check on flame sensor.
If there is a flame, the relay will
go to lock-out. The light in the red reset
switch, mounted visibly on the heater
will glow.
Line output during ignition time to control
high fire start on two stage or modulation
applications.
If no flame, then repeat starting
at pre-purge for 5 attempts.
If no ionisation after 5 attempts, then
lock-out.
Pre-purge
time
Ignition
time=
Safety
time Normal operation of burner relay Post-purge time
20 sec 5 sec 10 sec time
Start position