Robur Line F1, F1 21, F1 31, F1 41, F1 51 User, Installation And Service Manual

Heaters Line F1 Series

Gas fired unit heaters

for heating medium-large areas

Natural gas/LPG fired

Installation, use and
maintenance manual

User, Installation and Service Manual for F1 Gas Unit Heaters 1

F1 GAS FIRED UNIT HEATERS

TABLE OF CONTENTS

SECTION 1 - GENERAL WARNINGS ................................................................................3

SECTION 2 - GENERALITY AND CHARACTERISTIC......................................................5

OPERATION OF THE UNIT......................................................................................................................... 5

CONSTRUCTIVE CHARACTERISTICS...................................................................................................... 5

SAFETY AND CONTROL DEVICES ........................................................................................................... 6

TECHNICAL CHARACTERISTICS..............................................................................................................7

DIMENSIONS OF THE UNITS..................................................................................................................... 8

SECTION 3 - INSTALLATION ............................................................................................9

GENERAL RULES .......................................................................................................................................9

SIZE AND INSTALLATION OF THE AIR INLET / FLUE EXHAUST ......................................................... 11

SUPPORT BRACKET INSTALLATION .....................................................................................................17

INSTALLATION OF REMOTE CONTROL BOX........................................................................................ 17

BURNER PRESSURE ADJUSTMENT......................................................................................................18

CONVERSION TO ANOTHER TYPE OF GAS.......................................................................................... 20

OPERATING WIRING DIAGRAM.............................................................................................................. 22

INSTALLATION WIRING DIAGRAM.......................................................................................................... 23

WIRING DIAGRAM FOR MULTIPLE UNIT INSTALLATIONS .................................................................. 24

SECTION 4 - USE AND OPERATION ..............................................................................27

START AND STOP OF THE UNIT............................................................................................................. 27

SECTION 5 - MAINTENANCE AND SERVICING.............................................................29

REMOVABLE BURNER............................................................................................................................. 29

OPERATING FAILURES............................................................................................................................ 30

TYPES OF FAILURES AND SERVICING.................................................................................................. 30

CASE N°1: The unit locks out during the first ignition phase. ................................................................................30

CASE N°2: The unit locks out during operation. ....................................................................................................30

CASE N°3: The temperature limit thermostat (M1) stops the burner. .................................................................... 31

CASE N°4: The burner goes out and does not re-ignite even if room temperature requires it...............................31

CASE N°5: The exhaust fan will not start...............................................................................................................31

CASE N°6: The exhaust fan starts but the unit does not ignite..............................................................................31

TROUBLESHOOTING FLOW CHART ......................................................................................................32

User, Installation and Service Manual for F1 Gas Unit Heaters

2

User, Installation and Service Manual for F1 Gas Unit Heaters 3

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

User, Installation and Service Manual for F1 Gas Unit Heaters

4

User, Installation and Service Manual for F1 Gas Unit Heaters 5

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

6

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

A

E

C

D

D) speed regulation board

E) ignition transformer

Figure 1

User, Installation and Service Manual for F1 Gas Unit Heaters 7

TECHNICAL CHARACTERISTICS

MODEL UNIT F1 21 F1 31 F1 41 F1 51 F1 61 F1 81

Appliance Category II

2H3+

Appliance type C13 - C

33

- B

23 - C63

- C

53

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 2120 2860 4180 5100 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 250 300 350 410 640 900
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 52 60 63,5 70 90 108

Table 1

1 At 20°C - 1013mbar
2 At 15°C - 1013mbar
3 THROWS FOR GUIDANCE ONLY. THROW DEP ENDS 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

8

DIMENSIONS OF THE UNITS

A B C D E F G H J L N

F1 21 630 651 800 490 370 405 440 430 120 285 95
F1 31 630 671 800 490 370 405 440 430 120 285 95
F1 41 770 626 800 490 510 405 580 430 120 285 95
F1 51 880 658 800 490 620 405 690 430 120 285 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

I

M

3

0

5

0

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

User, Installation and Service Manual for F1 Gas Unit Heaters 9

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 10

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

A

A

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

User, Installation and Service Manual for F1 Gas Unit Heaters 11

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:

- B

23

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).

- C

13

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 C

13

see figures

8/9) or vertical ones (for C

33

see figure 10).

- C

53

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).

- C

63

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 12

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

User, Installation and Service Manual for F1 Gas Unit Heaters 13

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 45o elbow an increment of 1,2 m in length should be added.

User, Installation and Service Manual for F1 Gas Unit Heaters 14

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 C

13

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

User, Installation and Service Manual for F1 Gas Unit Heaters 15

F

D

E

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 16

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

User, Installation and Service Manual for F1 Gas Unit Heaters 17

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 mm

2

section (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 18

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

CO2 in 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

CO2 in flue (%)

10,2 – 11,0 10,5 – 11,0

CO in flue (ppm)

0 - 30

Table 6

User, Installation and Service Manual for F1 Gas Unit Heaters 19

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

CO2 in flue (%)

10,1 – 10,9 10,4 – 10,9

CO in flue (ppm)

0 - 30

Table 7

Figure 14

VALVOLA
SIT 830 TANDEM

VALVOLA BM 762

A

B

E

B

E

A

HONEYWELL VK 4125A

A

B

E

A) Burner pressure adjustment

screw (by BM 762 the

protection must be removed)
B) Inlet gas pressure check tap
E) Burner pressure check

User, Installation and Service Manual for F1 Gas Unit Heaters 20

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.

User, Installation and Service Manual for F1 Gas Unit Heaters 21

Figure 15 Figure 16

C) Loosen, without removing, 4 screws for

fastening the gas supply pipe to the gas valve
(figure 16);

D) Shove off the gas pipe and take off the nozzle.

If necessary use the screwdriver as to lever it

(see figure 17);
E) Take off the gasket and mount it at the new nozzle
F) Thread the new nozzle at the seat;
G) Re-assembly the gas pipe, Check that the

round gasket inside the ring nut and the

square one at the valve fitting are positioned

correctly. Tight the ring nut whit tightening

torque of 62±2Nm; tight the valve screws;

Figure 17

H) Proceed then with the adjustment of the unit, as described in previous chapter ‘’Burner

pressure adjustment’’
I) When appliance is on, check for gas leakage with soapy solution or other suitable method.

Check all fittings - even those which were not handled during the operation;
J) Replace the label showing the type of gas for which the unit is set with the other one

indicating the type of gas actually used.

NOZZLES FOR NATURAL GAS AND LPG
F1 21 F1 31 F1 41 F1 51 F1 61 F1 81
Natural Gas (G20) (mm)

Code

4,40

072

5,60

073

6,10

075

8,00

076

9,00

077

11,10

078

LPG (G30-G31) (mm)
Code

2,50

079

3,00

080

3,25

081

3,65

129

4,20

098

4,80

130

Table 7

NOZZLE

User, Installation and Service Manual for F1 Gas Unit Heaters 22

OPERATING WIRING DIAGRAM

Figure 18

LEGEND:

M9 fuse 5x20 6.3 A F NP pressure switch
M2 fan thermostat CS combustion blower capacitor (only for F1 21,31,41)
CV fan capacitor (2 pcs. for F1 61/81) S combustion blower motor
V fan motor ((2 pcs. for F1 61/81) TR ignition transformer
Z1 summer/winter switch RP7 ignition electrode
Z9 room thermostat RP8 flame sensor
M1 temperature limit thermostat Q1 gas valve
M4 flame control unit L El. Supply – phase
L1 lockout warning lamp N El. Supply – neutral
P1 reset button GND ground
BSRB Blower Speed regulation Board

BSRB

User, Installation and Service Manual for F1 Gas Unit Heaters 23

INSTALLATION WIRING DIAGRAM

Figure 19

INSTALLATION WIRING DIAGRAM OF F1 SERIES HEATERS (SEE LEGEND FOR FIGURE 18)

User, Installation and Service Manual for F1 Gas Unit Heaters 24

WIRING DIAGRAM FOR MULTIPLE UNIT INSTALLATIONS

230 V
50 Hz

GND

Figure 20

WIRING DIAGRAM FOR MULTIPLE HEATERS INSTALLATION WITH ONE PROGRAMMER AND MORE ROOM THERMOSTATS

P programmatore
TA termostato ambiente
RL1-2-3 relè comando
programmato

230 V
50 Hz

Figure 21

WIRING DIAGRAM FOR MULTIPLE HEATERS INSTALLATION WITH ONE PROGRAMMER AND ONE ROOM THERMOSTATS (MULTIPLE RELAY
SOLUTION)

P Programmer
TA ambient thermostat

RL 1-2-3 programming
command relay

P Programmer
TA ambient thermostat

RL 1-2-3 programming
relay

GND

User, Installation and Service Manual for F1 Gas Unit Heaters 25

P programmatore
TA termostato ambiente
RL relè comando
programmato

50 Hz

230 V

Figure 22

WIRING DIAGRAM FOR MULTIPLE HEATERS INSTALLATION WITH ONE PROGRAMMER AND ONE ROOM THERMOSTATS (ONE RELAY
SOLUTION)

P Programmer
TA ambient thermostat

RL programming relay

GND

User, Installation and Service Manual for F1 Gas Unit Heaters 26

User, Installation and Service Manual for F1 Gas Unit Heaters 27

SECTION 4 - USE AND OPERATION
START AND STOP OF THE UNIT

WARNING

Qualified service engineer must fulfil the first start-up of the appliance.
Before turning on the heater, a qualified service engineer must check:

• that electric and gas supply ratings are the same as those given in the data plate.

• that the setting is compatible to the heater’s power

• that the exhaust duct operates correctly

• that the gas supply pressure is within rating limits

• that combustion air feed and exhaust occur correctly according to the existing standards.

Winter

1) Set the room thermosta t to the highest temperature.

2) Check that the gas cock is open.

3) Supply the unit with electric power by closing the omnipolar switch.

4) Press the button A summer/winter in the position winter

(see figure 23)

5) After the pre-purge period (about 40 seconds), the gas solenoid valve opens and the ignition
electrode begins to sparkle and lights the burner.

6) When flame detected the flame control box is keeping the gas valve opened.

7) Otherwise the flame control unit locks out the heater: the gas supply to the burner is shut off
and a lock-out light C on the reset button B lights up (see figure 23).

8) When default described at item 7) occurs, press the reset button B.

9) If ignition has occurred regularly set the room thermostat to the desired temperature.

WARNING

After a long period of inactivity of the unit or at the first start-up, it may be necessary to repeat the

ignition operation a few times due to the presence of air in the piping.

Figure 23

REMOTE CONTROL SWITCH

☼

C

A

B

A summer/winter switch:

winter position

for the heating, function

summer position

☼ for the ventilation

B reset button
C lck-out light

User, Installation and Service Manual for F1 Gas Unit Heaters 28

Stop of the unit

- To turn off the unit, set the room thermostat to the lowest temperature. The burner is turned off,
while the fan will continue to operate until the unit is completely cold.

WARNING

In case of long inactivity, after carrying out the above operation and after the fans have turned off,
close the gas cock and disconnect the electric supply by using the omnipolar switch placed on the

supply line.

NOTE

It is not good practice to turn the unit off by disconnecting the electric power supply, as this may

damage the unit. In fact, this causes the immediate stop of the fans, unit overheating and possibly

the activation of the temperature limit thermostat.

Summer operation

- Close the gas cock and check the power supply

- Press the button A in the position summer

and fan will start.

End of the season

- Turn off the appliance and wait the arrest of the
fans

- Cut off the gas supply of the appliance

- Cut off the electrical supply if summer ventilation

is not foreseen

Reset of high limit temperature switch
High limit temperature switch stops the burner if
appliance is overheated. It must be reset manually, by
pushing the reset button placed on the rear panel of
the appliance (remove the protection cap first see
figure 24). After resetting replace the protection cap.

WARNING

The activation of the High Limit Temperature Switch indicates ALWAYS the malfunction of the appliance.

In case of frequent stops of the unit please contact Client Support service.

Figure 24

RESET BUTTON OF
THE LIMIT SWITCH

User, Installation and Service Manual for F1 Gas Unit Heaters 29

SECTION 5 - MAINTENANCE AND SERVICING

REMOVABLE BURNER

The burner mounted inside the F1 Gas Unit Heaters is removable type: this particular construction
characteristic allows the cleaning of the burner.

To clean the burner proceed as follows:

1. Cut off the electricity and gas supply;

2. Open the side panel of the heater;

3. Demount the hexagonal nut which connect gas pipe and the air blower (see figure 15);

4. Move the gas pipe and remove the gas nozzle (see figure 17);

5. Remove 4 nuts, which fix the casing of air blower;

6. Remove the deflector and gasket;

7. Loose 4 screws which fix the burner, and when the burner is leaned on the bottom unscrew and

remove them completely;

8. Insert a pipe inside the burner (ATTENTION: don’t bend the burner and don’t damage the

deflectors inside the burner) and use the pipe as a lever to pull it up and than to remove the
burner;

9. Clean the burner with compressed air;

10. Reinsert the burner (MOTE: slot inside the burner must be in the upper position);

11. Fix the lower screws first and than the upper ones. Cross-tighten the screws;

12. Reinsert the diaphragm and relative gaskets;

13. Fix the casing of the air-blower with 4 screws;

14. Insert the nozzle and gasket in the holder of the nozzle;

15. Screw tight the hexagonal which fix the gas pipe to the blower;

This procedure is to be applied once in 2/3 years by normal working conditions, or once per year
when there is a lot of impurities in the combustion air (example: “B type” installation of the heater in
factories with welding process).

The cleaning of the burner is to be done by qualified personal.

Erroneous or not correct operation of the gas pipeline can cause dangerous gas leakages on

all circuit and particularly on the tamped segment.

WARNING

User, Installation and Service Manual for F1 Gas Unit Heaters 30

WARNING

Only qualified service engineer authorised by Manufacturer must carry out the operation of
servicing and maintenance.

OPERATING FAILURES

Before checking for possible failures, ensure that:
A) Correct electric supply: 230-240V ±10% 50Hz and adequate earthing are provided.
B) The gas is supplied.
C) Pressures and flows are within the limits recommended by the manufacturer. A pressure lower

than the given limits will result in insufficient gas inlet. The causes for this may be the following:

If the unit is fed with natural Gas:

a) Poor gas meter performance.
b) The length of the pipes and the number of elbows are excessive with respect to the

diameter.

If the unit is fed with L.P.G.:

a) It can happen that after the first time the burner turns off, the unit locks out at the moment

of ignition. In this case it may be that the reducer flow is insufficient.

b) If the required pressure is not reached, it may be either that the meter does not provide

adequate flow or the length of the pipes and the number of elbows are excessive with
respect to the diameter.

Only at this point proceed with the specific trouble shooting.

WARNING

Before opening the side door to access the control panel, CUT OUT THE POWER
SUPPLY to the unit using the omnipolar switch.

TYPES OF FAILURES AND SERVICING

In case of a failure, call a qualified service engineer.

CASE N°1: The unit locks out during the first ignition phase.

a) The ignition electrodes are broken or badly positioned.
b) The flame sensor is broken or incorrectly positioned or touches the unit ground.
c) Failure in the flame control unit or in its electrical connections.
d) Failure in the gas valve or in its electrical connections.
e) Check that the unit has a good earth.
f) Air is inside the gas pipes.
g) Wrong adjustment of the gas pressure on the burner.

CASE N°2: The unit locks out during operation.

a) The gas supply is suddenly cut off due to a failure in the gas system. The ignition control

repeats the ignition cycle, after which the gas valve closes locking out the unit (accidental gas
inlet cut off).

b) The power supply is suddenly cut off due to a failure in the electrical supply mains. If the

electrical cut off period is prolonged, the temperature limit thermostat (M1) locks out the unit,
thus preventing re-ignition. When electricity returns, push the reset button which is placed

User, Installation and Service Manual for F1 Gas Unit Heaters 31

externally, on the rear panel, under the black screw plug (accidental power supply break - see
figure 23).

c) The flame sensor touches the unit ground , or it is disconnected.
d) The gas valve does not open due to a failure of the valve itself or of its electrical connections.

CASE N°3: The temperature limit thermostat (M1) stops the burner.

a) The heat exchangers have overheated. Check the operation of the fan, gas pressure and

nozzles.

b) The exchangers overheat due to accumulation of dirt. Clean the exchangers (dirt can also

obstruct and supply grille).

To reset the thermostat, when electricity returns, push the reset button which is placed externally,
on the rear panel, under the black screw plug (see figure 24).

CASE N°4: The burner goes out and does not re-ignite even if room temperature requires it.

a) Check the performance of the room thermostat and its electrical connections.
b) Check the position of the room thermostat (check that it is not influenced by external heat

sources).

CASE N°5: The exhaust fan will not start.

a) Check that the room thermostat is set on the desired temperature.
b) Check the electrical connections of the exhaust fan and its capacitor.
c) Check integrity of the unit’s protection fuse.
d) Make sure that neither the limit nor the safety thermostat have operated.

CASE N°6: The exhaust fan starts but the unit does not ignite.

a) Intake and/or exhaust duct are obstructed or too long.
b) The electrical or pneumatic connections of the pressure switch are faulty
c) The flame control unit does not start the cycle: replace the internal fuse of the flame control unit

or the control unit itself.

d) Pressure switch out of setting: replace or adjust it.

User, Installation and Service Manual for F1 Gas Unit Heaters 32

TROUBLESHOOTING FLOW CHART

Consult your

installer

The heater does not

start neither for heating

nor for ventila tion

Main switch

ON

Check the fuse. Is

it burnt-out?

Open the gas supply.

Main switch

OFF

Check for

correct electric

supply and phase

Electric supply

is 230-240 V -

50 Hz ?

Phase reaches

the correct

terminal

With unit on and off

check for correct

gas pressure

Is it correct as in

the installation

manual?

The Summer /
Winter switch is
in winter
position?

Is the unit equipped

with a timer

thermostat?

The thermostat
requires heating

Replace the combustion
blower capacitor. If this
action does not resolve the
problem, replace the flue fan.

Check for

correct

ambient

thermostat

operation. Is

the contact

open?

Check for correct

temp. limit thermostat

operation.

Is the contact open?

Check the

pressure switch

for correct

operation.

Pressure switch

locked out in

N.A. position?

Check installation

conditions.

1) Pipe length

2) Pipe clogging

3) Pressure switch

silicone pipe
obstructed. If
necessary,
calibrate the
pressure switch.

Replace the

defective

thermostat, then

check fan again

Replace the defective

thermostat, then

check flue fan again

Troubleshoot for

overheating (excessive

gas supply, fan failure,

etc...)

Replace the

defective press.

switch

Place the

thermostat on

heating

Place the ambient

thermostat on

maximum

temperature

Replace the

fuse

Exchange the live

wire with the

neutral wire

Correct pressure using

proper

pressure reducers (as regard s

L.P.G. units) trn to the gas

supplier

YES

YES

NO

Any unit

overheating?

Continues
on page 27

YES

YES

YES

NO

NO

NO

NO

YES

NO

YES

NO

YES

NO

NO

NO YES

NO

NO

YES

NO

YES

YES

Switch the
summer/winter
switch to winter
position

Turn on the thermostat

Does the
combustion
blower starts?

Is the

combustion

blower live?

User, Installation and Service Manual for F1 Gas Unit Heaters 33

continued

User, Installation and Service Manual for F1 Gas Unit Heaters 34

With the aim of continuously improving the quality of our products, Robur S.p.A.

reserves the right to vary above instructions and drawings without any prior notice.

Robur S.p.A

Via Parigi 4/6

24040 Verdellino/Zingonia (BG) Italy

Phone: [phone] Fax:[phone]

http://www.robur.it e-mail: [e-mail]

Robur is dedicated to dynamic progression
in research, devepment and promotion
of safe, environmentally-friendly, energy-efficiency products,
through the commitment and caring
of its employees and partners.

Robur Mission

Robur Spa
advanced heating
and cooling technologies
Via Parigi 4/6
24040 Verdellino/Zingonia (Bg) Italy
T [phone] F [phone]
www

.r

obur.com [e-mail]

Revision: H Code:D-LBR158 14MEDSDC003 05/02/2014