Robur F1 81 User manual

Heaters Line F1 Series
Gas fired unit heaters
for heating medium-large areas
Natural gas/LPG fired
Installation, use and
maintenance manual

Ed. 11/2006
F1 GAS FIRED UNIT HEATERS
TABLE OF CONTENTS
SECTION 1 GENERAL WARNINGS:.................................................................page 3
SECTION 2 GENERALITY AND CHARACTERISTICS:.....................................page 4
Operation of the unit....................................................................................page 4
Constructive characteristics ........................................................................page 4
Safety and Control devices .........................................................................page 5
Technical Characteristics............................................................................page 6
Dimensions .................................................................................................page 7
SECTION 3 INSTALLATION:.............................................................................page 8
General rules...............................................................................................page 8
Size and installation of the air inlet/flue exhaust..........................................page 10
Support bracket installation.........................................................................page 16
Installation of Remote control box...............................................................page 16
Burner pressure adjustment........................................................................page 17
Conversion to another type of gas ..............................................................page 18
Operating Wiring diagram ...........................................................................page 20
Installation Wiring diagram..........................................................................page 21
Wiring Diagram for Multiple unit installation ................................................page 22
SECTION 4 USE AND OPERATION:.................................................................page 24
Start and Stop of the unit ............................................................................page 24
SECTION 5 MAINTENANCE AND SERVICING:................................................page 26
Removable burner ......................................................................................page 26
Operating failures........................................................................................page 27
Types of failures and servicing series.........................................................page 27
Case N°1 - The units locks out during the first ignition phase.............page 27
Case N°2 - The units locks out during operation ................................page 27
Case N°3 - Temperature limit thermostat (M1) stops the burner........page 28
Case N°4 - The burner goes out and does not re-ignite even
if the room thermostat requires it....................................page 28
Case N°5 - The exhaust fan will not start............................................page 28
Case N°6 - The exhaust fan starts but the unit does not ignite...........page 28
Troubleshooting Flow Chart........................................................................page 29

Ed. 11/2006
User, Installation and Service Manual for F1 Gas Unit Heaters2

Installation, Start-Up and Service Manual for F1 Gas Unit Heaters 3
Ed. 11/2006
SECTION 1 - GENERAL WARNINGS
- This manual is an integral and essential part of the product and must be given to the user.
-Qualified service engineers are those having specific technical experience in the field of
heating installation unit for domestic and industrial use. In the case of any doubt,
contact your local agent or Manufacturer.
-This unit must be exclusively used for the purpose it was intended. Any other use is to be
considered improper and therefore dangerous.
The manufacturer will not be held responsible for damages resulting from installation errors or
failure to comply with the manufacturer’s instructions.
-Do not obstruct the fan intake opening or the air delivery grids.
-In case of failure and/or poor operation, isolate the unit (disconnect it from the power supply
and close the main gas cock), do not attempt any repair or direct servicing.
Call qualified service engineers only.
The manufacturer’s authorised service centres using only original spare parts must only carry
out any repair to the products.
Misapplication of the above might compromise the safety of the unit.
To ensure unit efficiency and correct operation, it is essential that qualified service engineers
carry out annual maintenance following the manufacturer’s instructions.
-Should the unit be sold or transferred to another owner, please ensure that the manual
remains with the unit for use by the new owner and/or installer.
- Before turning the heater on, a qualified service engineer must check:
•that electric and gas supply ratings are the same as those given in the data plate.
•that the exhaust duct operates correctly.
•that combustion air feed and exhaust occur correctly according to the existing standards.
•the internal and external tightness of the pass supply line.
•fuel flow control according to the heater’s power requirements.
•that the heater is supplied with the type of fuel for which it is pre-set.
•that the gas supply pressure is within rating limits.
•that the gas supply system is suitable to the heater and all safety and check-over devices
prescribed by existing standards are duly installed.
-Do not use gas pipes to ground the appliance, or any other electrical appliance.
-Avoid unnecessary supply when unit is not in use and always close the main gas cock.
-If the appliance is turned-off for a longer time period, close the main gas supply cock and cut
off the electrical supply.
WARNING!
If you smell gas
•do not operate electric switches, telephones or any other object or device which may cause
sparks;
•open immediately doors and windows to create a cross-current of air to purify the room;
•shut-off the gas supply;
•call for a qualified service engineer

Ed. 11/2006
User, Installation and Service Manual for F1 Gas Unit Heaters
4
SECTION 2 - GENERALITY AND CHARACTERISTIC
OPERATION OF THE UNIT
- The F1 gas fired air heater is an independent heater appliance with airtight combustion circuit
and forced air draft.
- It’s designed for an indoor installation - inside the area to be heated.
-It’s adjustable for the use of Natural Gas (G20) or LPG (G30/G31).
-The combustion circuit is airtight regarding heated room and conforms the standard EN 1020 for
the C type appliances: the air inlet of the combustion air and the flue exhaust are outdoors and
are ensured through the operation of combustion blower. The appliance is certified either for the
B type installations, where is allowed combustion air inlet from indoors (from the area to be
heated).
-A room thermostat, (not supplied with the unit) controls the heater operation.
-When the thermostat is turned on the flame control box, after the pre-purge period (about 40
seconds), ignites the burner.
-The flame sensor controls the ignition of the burner. If the flame does not appear the flame
control unit locks out the heater:
-The combustion products pass through the heat exchangers, the air flow given by the axial fan
provides warm air to the room.
-The airflow direction is regulated by means of adjustable louvres. A ‘’vertical louvres kit’’ is also
available on request for horizontal regulation of the airflow.
-The fan control thermostat allows the axial-flow fan to start automatically only when the heat
exchangers are hot and to turn off when they are cold. This prevents cool air being blown into
the room
-If heat exchangers overheat due to malfunction, the temperature limit thermostat cuts off the
supply to the gas valve, thus interrupts fuel flow and turns off the main burner
NOTE
After removing the cause of overheating, Qualified service engineer should carry out resetting of
the temperature limit thermostat,
-Ahead of the burner is installed the flue fan which makes the air-gas mixture and forces draft of
the exhaust flues.
-In case of obstructions in the intake duct or flue fan malfunction, a differential pressure switch
closes the gas valve and consequently stops fuel flow to the burner.
-In the summer time it’s possible to activate only the axial fan to provide pleasant and refreshing
air movement in the room. (see Section 4 - Paragraph “Summer”).
CONSTRUCTIVE CHARACTERISTICS
-premix burner made of stainless steel
-high head blower; models F1 51/61/81 are provided with electronic board that controls and
guarantees constant speed of the blower;
-cylindrical combustion chamber made of stainless steel
-heat exchanger patented by Robur made of special aluminium alloy, fining horizontally on the
air side and vertically on the flue side with extremely high capacity of thermal exchange
-insulated steel casing painted with epoxy powders
-axial fan with high air flow capacity
-according to the norms in force regarding the radio interference
-heat recovering post-ventilation

User, Installation and Service Manual for F1 Gas Unit Heaters 5
Ed. 11/2006
SAFETY AND CONTROL DEVICES
-High temperature limit switch: 100°C with manual reset (prevents the overheating of the heat
exchangers)
-Pressure differential switch: for the control of the correct flue fan operation; when fan not
operates correctly or the flue/air inlet ducts are obstructed the pressure switch stops the gas
supply by closing the gas valve.
-Gas valve: in the case that one of the safety devices is activated (limit thermostat, safety
thermostat etc.) the gas valve is automatically de-energised with contemporary cut-off the
burner’s gas supply.
-Electrical supply: 230 V – 50 Hz
-Operational temperature: 0°C to + 60°C
-Model: HONEYWELL VK 4125A for the Heaters F1 21. 31. 41. 51. 61
BM 762 for the Heater Model F1 81
-Ignition and flame control box: controls the ignition and flame of the premix burner; if the is
flame not detected during the safety period the flame control box will stop the appliance; with
manual reset.
-Safety time: ignition 10 seconds
-Purge time: 40 seconds
-Power supply: 230V – 50 Hz
-Flame control box model: BRAHMA CM32PR
-Ignition transformer: BRAHMA TC2LTCAF / EICHHOFF 4718/2
A
) flame control box
B) pressure switch
C) fuse 6,3A 5x20
B
AE
C
DD) speed regulation board
E) ignition transformer
Figure 1

Ed. 11/2006
User, Installation and Service Manual for F1 Gas Unit Heaters
6
TECHNICAL CHARACTERISTICS
MODEL UNIT F1 21 F1 31 F1 41 F1 51 F1 61 F1 81
Appliance Category II2H3+
Appliance type C13 - C33 - B23 - C63 - C53
Nominal heat input (5) kW 23,08 30,77 37,15 48,35 61,32 77,14
BTU 78804 105046 126841 165072 209357 263369
Nominal heat output kW 21 28 33,8 44 55,8 70,2
BTU 71698 95597 115407 150224 190520 239668
Efficiency (5) % 91 91 91 91 91 91
Nominal air flow (1) m3/h 2000 2700 3400 4200 5200 7800
Temperature rate K 31,1 30,7 29,5 31 31,8 26,7
Gas Consumption (2) Natural Gas m3/h 2,43 3,25 3,93 5,11 6,49 8,16
LPG G30
LPG G31
kg/h
kg/h 1,80 1,78 2,42 2,38 2,93 2,87 3,81 3,74 4,84 4,75 6,09 5,97
Inlet gas pressure Natural Gas
LPG. G30
LPG G31
mbar 20
30
37
Diameter gas inlet " 3/4F
Pipe Diameter air mm 80
flue mm 80
Voltage 230V - 50Hz
Wattage W 260 400 450 640 900
Operating temperature °C 0° +35°(4)
Fuse A 6,3
Throw
(residual air speed >1m/s) (3) m 14 16 20 22 25 29
Noise level 6 m distance
in free field dB(A) 41 43 44 46 47 49
in tipycal installation dB(A) 53 55 56 57 60 63
Weight kg 55 59 68 80 90 108
Table 1
1 At 20°C - 1013mbar
2 At 15°C - 1013mbar
3 THROWS FOR GUIDANCE ONLY. THROW DEPENDS ON HEIGHT OF THE BUILDING, MOUNTING HEIGHT OF THE HEATER, ROOM TEMPERATURE AND LOUVRE
SETTING.
4 WARNING: THE ROOM OPERATIONAL TEMPERATURE IS BETWEEN 0° AND +35°C ;THE APPLIANCE’S COMPONENTS OPERATIONAL TEMPERATURE IS BETWEEN
0° AND +60°C
5 DATA REFERED TO THE LOW HEAT VALUE (9,45 kWh/m3- 15°C 1013 mbar)
WITH THE AIM OF CONTINUOUSLY IMPROVING THE QUALITY OF ITS PRODUCTS, THE
MANUFACTURER RESERVES THE RIGHT TO VARY ABOVE INFORMATION WITHOUT ANY PRIOR
NOTICE.

User, Installation and Service Manual for F1 Gas Unit Heaters 7
Ed. 11/2006
DIMENSIONS OF THE UNITS
A B C D E F G H J L N
F1 21 630 640 800 490 370 405 440 430 120 285 95
F1 31 630 640 800 490 370 405 440 430 120 285 95
F1 41 770 670 800 490 510 405 580 430 120 285 95
F1 51 880 700 800 490 620 405 690 430 120 285 95
F1 61 1070 640 800 490 810 405 880 430 120 285 95
F1 81 1270 700 800 490 1010 405 1080 430 120 285 95
P Q R S T U V W X Y Z
F1 21 390 435 340 600 720 90 3/4 - 80 80 355
F1 31 390 435 340 600 720 90 3/4 - 80 80 355
F1 41 460 435 340 600 720 90 3/4 - 80 80 410
F1 51 515 435 340 600 720 90 3/4 - 80 80 410
F1 61 398 435 340 600 720 90 3/4 432 80 80 355
F1 81 468 435 340 600 720 90 3/4 495 80 80 410
Y
X
T
S
R
N
U
J
P
W
Z
4
V
123
VISTA POSTERIORE
F1 81-61
C
Q
F
D
B massima
VISTA LATO DESTRO
A
G
E
L
H
VISTA FRONTALE
Y
X
T
S
R
N
U
J
P
Z
VISTA POSTERIORE
F1 21-31-36-41-51
V
123
4
1 SCARICO FUMI
2 PRESA ARIA
COMBURENTE
3 INGRESSO CAVO
DI ALIMENTAZIONE
4 ATTACCO GAS
IM3050
Figure 2
REAR VIEW REAR VIEW
RIGHT SIDE VIEW FRONT VIEW
B maximum
1. Flue Exhaust
2. Air Supply
3. Power Line
4. Gas Connection

Ed. 11/2006
User, Installation and Service Manual for F1 Gas Unit Heaters8
SECTION 3 - INSTALLATION
GENERAL RULES
WARNING!
- A qualified service engineer following the manufacturer’s instructions must carry out the
installation.
- Qualified engineer means those having specific technical competence according to
national/international standards. In any case all necessary information could be obtained
directly by Qualified Engineer or Manufacturer.
- An incorrect installation can cause damages to people, animals and property. In case of
erroneous installation, the manufacturer cannot be held responsible for such damages.
- The units must be installed according to the national and international norms regarding this
type of appliances and applications.
Install the gas supply lines, the electric power lines and a suitable support bracket for the unit
according the approved installation project.
Installation procedures should be as follows:
A. Unpack the unit, carefully checking that it has not been damaged. Every unit is factory tested before
shipment, therefore, if there are damages, report them immediately to the carrier.
B. The minimum distance from the wall behind the unit must be enough for air circulation. The
minimum distance from the lateral walls is given by Figure 3.
C. The recommended height from the floor to the heater base is 2.5 to 3.5 m. It is not
recommended to install the appliance under the 2.5m height.
D. A gas cock and a pipe union must be provided for gas supply.
E. Make sure that an adequate gas supply from the gas network is provided, particularly if the unit
is supplied with:
Natural gas - G20:
Be sure that the pressure of the gas network, with the unit in operation, is set at 20 mbar (0.29
psig, 8.03 in.WG.) allowed tolerance between 17 and 25 mbar (0.25 to 0.36 psig; 6.9 to 10.0
in.WG.).
LPG (Propane – Butane mix) - G30:
For the first pressure drop required in the supply, it is advisable to install a pressure
governor near the liquid gas tank so as to reduce the pressure to 1.5 bar (22 psig). A
pressure governor for a second pressure drop should be placed near the heater to reduce
the pressure to 30 mbar (0.43 psig; 12.0 in.WG.) allowed tolerance between 20 and 35
mbar (0.29 to 0.50 psig; 8.1 to 14 in.WG.).
LPG (Pure Propane) - G31:
For the first pressure drop required in the supply, it is advisable to install a pressure
governor near the liquid gas tank so as to reduce the pressure to 1.5 bar (22 psig). A low
pressure governor for a second pressure drop should be placed near the heater to reduce
the pressure to 37 mbar (0.43 psig; 12.0 in.WG.) allowed tolerance between 25 and 45
mbar (0.29 to 0.50 psig; 8.1 to 14 in.WG.).
NOTE: In the case of doubt, adjust the appliance as for the propane- butane mix.
F. Carry out the electrical connections according to the installation wiring diagram (see figure 19),
checking that the voltage supply is 230/50Hz single-phase. For this operation make sure that:
- all electrical supply parameters are according to those required on the type plate of the appliance.
- wire type is H05 VVF 3x1 mm2 with a maximum external diameter of 8.4 mm.
- when connecting, ensure that the earth wire is longer than the live wires, so that it will be the last
wire to break if the supply cable is stretched, thus ensuring a good earth continuity.

User, Installation and Service Manual for F1 Gas Unit Heaters 9
Ed. 11/2006
NOTE
The electrical safety of the unit is attained only when the unit itself is correctly connected and
efficiently grounded according to the existing safety standards. Do not use gas tubes to earth
electrical apparatus.
G. The unit should be connected to the electric supply line by means of an omnipolar switch with a
minimum contact opening of 3 mm. An omnipolar switch is a '’Double pole isolating switch’’, i.e.
a switch capable of disconnecting both on phase and neutral. This means that when the switch
is opened, both contacts are disconnected.
H. It is mandatory to install a room thermostat connected to the unit according to the installation
wiring diagram (figure 19). It is recommended to place the sensor at about 1.5 m from the floor,
protected against air draughts, direct exposure to sun rays and direct heat sources (lamps, hot
air flows from the unit itself, etc.). If possible, DO NOT place the thermostat on walls
bordering the outside, to avoid false temperature readings and therefore system operation. IF
THE ROOM THERMOSTAT IS PROPERLY INSTALLED, UNWANTED STARTING AND
STOPPING OF THE SYSTEM WILL BE AVOIDED AND ADEQUATE ROOM COMFORT
WILL BE ENSURED. As an alternative to the room thermostat it’s possible to install the
programmable remote control which could be supplied on request as an optional accessory.
I. To obtain the maximum system efficiency it is advisable to comply with the following rules:
-Install units as close as possible to the work area, taking care that the air flow does not come
directly into the contact with people.
-Take obstacles into consideration (columns, etc.)
-For better heat distribution in the case of multiple unit installation, create alternate flows of hot
air (see figure 4).
-In some cases it may be suitable to place the units close to the main doors, so they can
operate as an air barrier when doors are opened.
2,5 - 3,5 m
min 0,4 m 0,35
min
0,2m AA
A= Lunghezza
del generatore
Figure 3
CLEARANCES TO BE RESPECTED
A= LENGTH OF
THE UNIT
min 0,4 m
2,5
–
3,5 m
min
0,2 m A A

Ed. 11/2006
User, Installation and Service Manual for F1 Gas Unit Heaters10
Figure 4
POSITION OF THE UNITS
SIZE AND INSTALLATION OF THE AIR INLET / FLUE EXHAUST
F1 Series gas fired unit heaters can be installed as following:
-B23 type installation, combustion air taken directly from the room and flue exhaust gases to the
outside. This exhaust flue duct can be either horizontal or vertical. This type of installation is not
sealed regarding the heated room (see figures 6/7).
-C13 e C33 type installation; room sealed combustion circuit. Appliance with inlet air supply and
outlet of exhaust gases with, either, concentric or separate ducts - horizontal (for C13 see figures
8/9) or vertical ones (for C33 see figure 10).
-C53 type installation: room sealed combustion circuit; appliance with inlet air supply and outlet of
exhaust gases by using separated ducts and terminals n different walls, for example, the air inlet duct
from the wall behind the appliance and the flue exhaust duct on the roof (see figure 11).
-C63 type installation: allows installing the certified air inlet/flue exhaust ducts, elbows and
terminals purchased on the market. Moreover, it permits to use the pipe diameters bigger than
80mm: for example when the installation requires using the pipe of the larger diameter, caused
by the longer ducts. With this typology, for the calculus of the flue/air inlet duct refer to the duct
manufacturers data and furthermore to the flue composition, flue flow and its temperature. (see
table 2).
Use only approved ducts for the installation of the units. Upon request, manufacturer can supply
approved rigid pipes, coaxial pipes and terminals.
To determine a correct size of the flue system its total pressure drop has to be calculated.
The allowed pressure drop in the pipe system depends on the model of the unit (see table 2).
Table 3 shows the maximum allowed pressure drop for each unit - diameters Ø80 and Ø100; it
shows the losses of the exhaust and air intake flues regarding the coaxial ducts supplied by
manufacturer.
External terminals pressure losses are negligible since it is very low.
Check the total inlet/outlet pipes pressure losses regarding maximum values given by table 2. On
the next page follows the example of pressure loss calculation and respective duct project. It must
be checked that the total amount of the flue system pressure losses are within the minimum and
the maximum losses allowed for the unit (see table 2).
Table 4 gives the lengths of the air supply and flue exhaust ducts for different types of installation.
These values are APPROXIMATE for the types of installation shown on the figures 6,7,8,9,10 and
11.

User, Installation and Service Manual for F1 Gas Unit Heaters 11
Ed. 11/2006
Note: When horizontal pipes with lengths above 1 metre are installed, the flue pipe must be
mounted with a slope of 2 to 3 cm each 1 metre length (see fig. 5), to prevent entering the
condense drops into the unit. In addition, to install correctly the flue exhaust and the air intake
terminals, follow the details given in figure 8.
SLOPE
2-3 CM PER METER
Figure 5
SLOPE OF THE HORIZONTAL FLUE PIPE
Note:
When vertical pipes with length above 3 metres are installed, to prevent that condense drops
enter the unit, on base of the vertically mounted flue pipe a T-shaped piece MUST be fitted,
in order to collect the condense.
Figure 6 Figure 7
INSTALLATION TYPE B23 WITH WALL TERMINAL INSTALLATION TYPE B23 WITH ROOF TERMINAL
FLUE
AIR
TOP VIEW SIDE VIEW

Ed. 11/2006
User, Installation and Service Manual for F1 Gas Unit Heaters12
Mod. Flue Temperature °C Flue flow (weight)
kg/h Max. Allowed
Pressure loss (Pa)
F1 21 195 38,2 19
F1 31 197 51,0 25
F1 41 205 61,6 30
F1 51 195 80,0 60
F1 61 198 101,5 80
F1 81 195 127,7 85
Table 2
TECHNICAL DATA FOR PIPES SUPPLIED ON REQUEST BY MANUFACTURER
Component’s pressure loss Ø 80 Component’s pressure loss Ø 100
Pipe (Pa/m) Elbow 90° (Pa) Coaxial Pipe (Pa/m) Elbow 90° (Pa) Coaxial (Pa)
Mod Flue Air Flue Air Wall
(OSCR007) Roof (OSCR008) Flue Aur Flue Air Roof (OSCR009)
F1 21 0,9 0,5 1,0 1,0 1,7 2,1 0,2 0,2 0,5 0,5 1,2
F1 31 1,4 0,7 2,6 1,3 3,2 8,7 0,3 0,3 1,7 0,8 5,1
F1 41 2,0 1,0 4,2 1,8 4,9 N.P. 0,6 0,6 2,8 1,3 10,1
F1 51 2,3 1,6 6,5 3,5 N.P. N.P. 1,3 1,0 5,0 2,5 16,9
F1 61 3,5 2,4 9,9 5,7 N.P. N.P. 2,1 1,1 7,4 4,7 N.P.
F1 81 9 3,4 14,8 11,0 N.P. N.P. 2,5 1,4 10,9 8,1 N.P.
Table 3
N.P.: INSTALLATION NOT POSSIBLE N.D.: INSTALLATION NOT AVAILABLE
TECHNICAL DATA FOR PIPES Ø 130 SUPPLIED ON REQUEST BY MANUFACTURER
Component’s pressure loss Ø 130
Pipe (Pa/m) Elbow 90 (Pa) Coaxial (Pa)
Mod Flue Air Flue Air Roof
(OKTC001) Wall (OKTC004)
F1 51 0,8 0,2 2,8 1,2 14 14
F1 61 1,1 0,3 3,2 1,4 19 19
F1 81 1,4 0,5 4,2 1,8 25 25
Table 3A
Note:
For each T-shaped piece an increment of 3 m in length should be added.
For each 45oelbow an increment of 1,2 m in length should be added.

User, Installation and Service Manual for F1 Gas Unit Heaters 13
Ed. 11/2006
MAXIMAL PIPE LENGTH BY VARIOUS INSTALLATION
Type of Installation
B 23 C 13 C 33 C 53
Coaxial pipe wall Coaxial pipe Roof
Pipe Ø 80 Ø 125
(OSCR007) Ø 180 (OKTC004) Ø 125
(OSCR008) Ø 150 (OSCR009) Ø 210 (OKTC001)
Horiz. Verti.
Separate
pipe
Ø 80 pipe
Ø 80 pipe Ø 130 pipe Ø 80 pipe Ø 100 pipe Ø 130
pipe 80
Mod
flue flue air/flue air/flue air/flue air/flue air/flue air/flue air/flue
F1 21 21 16 13+13 12+12 N.D. 8+8 15+15 N.D. 1+15
F1 31 17 14 11+11 10+10 N.D. 5+5 7+7 N.D. 1+14
F1 41 15 11 10+10 8+8 N.D. N.P. 4+4 N.D. 1+12
F1 51 25 23 14+14 N.P. 15+15 N.P. 8+8 15+15 1+15
F1 61 20 18 11+11 N.P. 12+12 N.P. 6+6 15+15 1+14
F1 81 8 6 5+5 N.P. 10+10 N.P. n.r. 14+14 1+6
Table 4
N.P.: INSTALLATION NOT POSSIBLE N.D.: INSTALLATION NOT AVAILABLE
NOTE
When Your installation does not coincide with values indicated by table 4 (for example installation
type C13 with air pipe 10m length and flue pipe 16m length) must be checked the total amount of
the flue system pressure loss. It is to be within the maximum loss allowed for the unit (see
example below).
CALCULUS EXAMPLE
F41 unit with following air/flue system is to be installed:
- 8 meters of flue pipe Ø 80
- 2 elbows 90° Ø 80 on the flue pipe
- 8 meters of air pipe Ø 80
Piping calculus is to be done watching out the maximum allowed pressure drop, which is
30Pa (see table 2).
Quantity Pressure drop
Flue pipe Ø 80 8 x 2,0 Pa = 16,0 Pa +
90° Elbow 2 x 4,1 Pa = 8,4 Pa +
Air pipe Ø 80 8 x 1,0 Pa = 8,0 Pa =
Total pressure drop 32,4 Pa
The total pressure drop of the system is BIGGER than allowed pressure drop (32,4 Pa
HIGHER THAN 30 Pa), therefore the installation is NOT POSSIBLE.
This flue system will be possible only if one of the following actions is taken:
- reduce the flue/air pipe length
- Increase the pipe diameter by using the pipe, Ø100

Ed. 11/2006
User, Installation and Service Manual for F1 Gas Unit Heaters14
F
DE
A
Cod. P3370
A F1 Unit Heater
D Pipe Ø 80
E Pipe Ø 80
F Coaxial Pipe
TOP VIEW
flue
air
TOP VIEW
Figure 8 Figure 9
C13 INSTALLATION WITH SEPARATE WALL TERMINAL C13 INSTALLATION WITH COAXIAL WALL TERMINAL
SIDE VIEW
Figure 10 Figure 11
C33 INSTALLATION ROOF COAXIAL TERMINAL C53 INSTALLATION WITH ROOF FLUE TERMINAL AND WALL AIR SUPPLY
PIPE

User, Installation and Service Manual for F1 Gas Unit Heaters 15
Ed. 11/2006
Figure 12
WALL TERMINAL POSITION
Note: If the total length of the flue system exceeds 8 metres, it is advisable to contact the Authorised
Engineer or Manufacturer.
1 = FLUE
2 = AIR SUPPLY
RECOMMENDED
2 1 ALLOWED
2
1
FORBIDDEN
2
1

Ed. 11/2006
User, Installation and Service Manual for F1 Gas Unit Heaters16
SUPPORT BRACKET INSTALLATION
Manufacturer supplies an optional, easy-to-install bracket, specifically designed for each heater.
Should you wish not to use these accessories, please refer to the diagram below. Fasten the unit
to the support brackets using four M10 bolts.
840
SIDE VIEW
FRONT VIEW
2,5 - 3,5 m
Model A
F1 21 370
F1 31 370
F1 41 510
F1 51 620
F1 61 810
F1 81 1010
Figure 13
SUPPORT BRACKETS
INSTALLATION OF REMOTE CONTROL BOX
F1 Series appliances are supplied with remote control box, equipped with summer/winter switch,
lockout lamp and the reset button (see figure 23). The remote control must be wired according the
norms and installed at suitable position. The wiring numeration between 1 – 7 must be respected.
The wiring n° 4 and 8 are not connected (free).
WARNING!
Qualified personnel must carry out this operation. Before performing this operation, cut off the
electrical supply. The section of every cable core to be used for this operation must be1 mm2.
To install the remote control box proceed as follows:
- Isolate the unit from power supply.
- Fix the control box in the desired position (maximum distance 20 metres from the gas unit
heaters) using expansion bolts.
- Mount the supplied cable of cable with 8 x 1 mm2section (maximum length 20 meters). In
the case you need longer cable than the supplied one, please contact your local dealer or
Robur SpA.
- Connect the control box to the cable.
- Connect the cables of the terminal board inside the unit following the indications given in the
installation diagram (see figure 19)
- Connect the power supply
- Start the unit.
- Check that, when the gas supply is cut off, the lock out warning light C on the control box
lights up (see figure 23). This operation takes about 40 seconds.
- Press reset button C and check that the unit restarts and the light goes out.
- Press the button A ( ) in order to control the correct operation of the summer/winter
function (the burner remains off while the fans are running).

User, Installation and Service Manual for F1 Gas Unit Heaters 17
Ed. 11/2006
Note: The control cables (specially those linked to the remote control and to the temperature
probe) must be kept far away from electrical cables this can be done using e.g shielding or
separate pipes for the two types of cables.
BURNER PRESSURE ADJUSTMENT
For correct operation, the burner pressure must be as given in table n°5, n°6 and n°7. The burner
gas pressure of each unit is set at the factory and is shown by the labels on the package and by a
label inside the control panel of each unit.
In the case the pressure adjustment is necessary keep in mind that:
- Natural Gas: the pressure is to be adjusted by turning the adjustment screw A (figure 14)
- LPG: the adjustment screw is to be screwed down completely to the stop in order to put the
pressure regulator out of operation. The reduction of the pressure from the mains is possible by
adjusting the low pressure governor installed on the gas supply line (see section 3 – General
rules for unit installation - page 6 item E).
Before adjustment of the burner pressure identify TYPE OF THE GAS VALVE installed in the
appliance (see figure 14), than proceed as following:
- Connect the manometer to the gas pressure tap E after unscrewing valve setting screw;
- Turn on the appliance;
- Turn clockwise/counterclockwise the setting screw A in order to set the required pressure value.
When LPG gas used turn completely the setting screw A, and if the pressure needs an ulterior
correction adjust the low pressure gas governor.
- Disconnect the manometer and close the gas tap by tightening adjustment screw.
- Two or three times turn on and turn off appliance to verify the correct and stabile adjustment.
- If necessary it’s possible to check the inlet pressure from the gas tap B.
WARNING!
•After setting the gas pressure, stop and start the unit, and check that burner pressure has
stabilised. If necessary perform a new adjustment.
•After completing the gas pressure adjustment, seal the valve setting screw.
•Check the gas leakage using the water/soap foam or other suitable method.
BURNER PRESSURE SETTING TABLE MODELS SERIES F1
SUPPLIED WITH NATURAL GAS (G20) (GAS SUPPLY PRESSURE 20 mbar)
F1 21 F1 31 F1 41 F1 51 F1 61 F1 81
Burner Pressure (mbar)
(mmH2O) 10,5
107 9,3 95 9,6 98 8,0 81 8,3 85 7,0 71
CO2in flue (%) 8,6 – 9,4 8,8 – 9,2
CO in flue (ppm) 0 - 30
Table 5
BURNER PRESSURE SETTING TABLE FOR UNITS
SUPPLIED WITH LPG (G30) BUTANE OR COMMERCIAL MIX (SUPPLY PRESSURE 30 mbar)
F1 21 F1 31 F1 41 F1 51 F1 61 F1 81
Burner Pressure (mbar)
(mmH2O) 28,5
290 28,5 290 28,5 290 27,8 283 28,0 285 26,5 270
CO2in flue (%) 10,2 – 11,0 10,5 – 11,0
CO in flue (ppm) 0 - 30
Table 6

Ed. 11/2006
User, Installation and Service Manual for F1 Gas Unit Heaters18
BURNER PRESSURE SETTING TABLE FOR UNITS
SUPPLIED WITH LPG (G31) PROPANE OR COMMERCIAL MIX (SUPPLY PRESSURE 37 mbar)
F1 21 F1 31 F1 41 F1 51 F1 61 F1 81
Burner Pressure (mbar)
(mmH2O) 36,5
372 36,5 372 36,5 372 35,5 362 35,5 362 33,3 339
CO2in flue (%) 10,1 – 10,9 10,4 – 10,9
CO in flue (ppm) 0 - 30
Table 7
A) BURNER PRESSURE ADJUSTMENT SCREW
(BY BM 762 THE PROTECTION CAP MUST BE
REMOVED)
B) INLET GAS PRESSURE CHECK TAP
VALVE HONEYWELL VK 4125A
VALVE BM 762
B
EA
C) BURNER PRESSURE CHECK TAP
Figure 14
CONVERSION TO ANOTHER TYPE OF GAS
WARNING!
Qualified engineers must carry out this operation. Wrong and careless assembly of the gas circuit
may cause dangerous gas leakage. Use adequate seals for all connections.
If the type of gas on the identification label does not correspond to the one that will be used, the
unit must be converted and adapted to the type of gas you wish to use.
For this operation proceed as follows:
A) Cut off power and gas supply.
B) Take off the hexagonal ring nut which clamp the gas pipe to the nozzle support (see figure 15).
Pay the attention to the internal round gasket, don’t lose or damage it.
A
BE