Strebel Geneva C3 Installation guide

STREBEL
GENEVA CE
ATMOSPHERIC GAS BOILER
INSTALLATION, OPERATING AND
MAINTENANCE MANUAL

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INDEX
TABLE 1 TECHNICAL DATA
SECTION 1 GENERAL
SECTION 2 LOCATION
SECTION 3 VENTILATION
SECTION 4 GAS SUPPLY
SECTION 5 FLUE SYSTEM
SECTION 6 WATER CIRCULATION SYSTEM
SECTION 7 ELECTRICAL SUPPLY
SECTION 8 INSTALLATION
SECTION 9 COMMISSIONING AND TESTING
SECTION 10 SERVICING
SECTION 11 FAULT FINDING
FIGURE 1 CONTROL PANEL LAYOUT
FIGURE 2 NOVA SIT 822 GAS VALVE
FIGURE 3 ELEKTROGAS VM-L GAS VALVE
FIGURE 4 LPG CONVERSION

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TECHNICAL DATA
BOILER MODEL C3 C4 C5 C6 C7 C8 C9
Number Of Sections 3 4 5 6 7 8 9
Input kW
Btu/hr 21.4
73,017 31.7 108,160 42 143,304 52.3 178,448 62.7 213,932 73.7 251,464 83.8 285,926
Output kW
Btu/hr 19.3
65,852 28.6 97,583 37.7 128,632 47.1 160,705 56.5 192,778 66.4 226,557 75.6 257,947
Water Content Lits 10 12.5 15 17.5 20 22.5 25
Maximum Working
Pressure Bar Psi 4
58 4 58 4 58 4 58 4 58 4 58 4 58
Maximum Working
Temperature °C 90 90 90 90 90 90 90
Flow Rate 10°C
Differential Lt/sec M³/h 0.47
1.70 0.71 2.55 0.95 3.42 1.10 3.96 1.40 5.04 1.60 5.76 1.90 6.84
Water Resistance
10°C Differential mbar in Wg 9.5
3.7 20 7.8 36.5 14.4 23 9.1 34 13.4 46 18.1 57 22.6
Gas Consumption
Natural M³/h Ft³/h 2.0
70.21 2.9 104.00 3.9 137.79 4.9 171.58 5.8 205.70 6.8 241.79 7.8 274.93
Gas Consumption
LPG Kg/h Lbs/h 1.54
3.40 2.29 5.04 3.03 6.68 3.77 8.31 4.52 9.97 5.31 11.71 6.04 13.32
Burner Pressure
Natural mbar in Wg 14.8
5.8 14.5 5.7 13.2 5.2 14.5 5.7 14.5 5.7 14.5 5.7 14.5 5.7
Supply Pressure
Natural mbar in Wg 18
7 18 7 18 7 18 7 18 7 18 7 18 7
Burner Pressure
LPG mbar in Wg 31.8
12.5 30.8 12.1 30.3 11.9 29.7 11.8 29.4 11.6 29.1 11.4 31 12.2
Supply Pressure
LPG mbar in Wg 37
14.5 37 14.5 37 14.5 37 14.5 37 14.5 37 14.5 37 14.5
Main Injectors
Natural
LPG
mm
mm
2.6
1.75
2.6
1.75
2.7
1.75
2.6
1.75
2.6
1.75
2.6
1.75
2.6
1.65
Shipping Weight Kg
Lbs 87
192 110 243 136 300 164 362 186 410 213 470 234 516
Geneva ‘PV’ as above with these changes.
BOILER MODEL ‘PV’ PV 3 PV 4
Maximum Working
Pressure Bar Psi 3
44 3 44
Expansion Vessel
Capacity Lits Gal 8
1.76 10 2.20
Shipping Weight Kg
Lbs 94
207 118 260
TABLE. 1

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INSTALLATION INSTRUCTIONS
1.0 GENERAL
1.1 The STREBEL GENEVA ‘PV’ & ‘C’ range of Gas Fired Boilers are floor mounted open flued units for
connection to indirect heating and hot water systems.
The Geneva heat exchanger body is constructed of cast iron sections with a stainless steel atmospheric gas
burner suitable for Natural Gas and LPG (site conversion) the boilers as standard are fitted with electronic
ignition. The boilers are fitted with full safety devices including “Spillage Control System” (SCS) which
shuts down the boiler if Spillage is occurring and so prevents any escape of flue gases out the flue diverter,
also on the C60 & C68 models there is a Gas pressure switch for low gas inlet pressure.
The boilers are delivered completely assembled jackets fitted and fully insulated.
The Geneva ‘PV’ range is also fitted with three speed circulating pump, expansion vessel for use with a
sealed systems, 3 Bar safety valve, pressure gauge and water fill point (manual).
1.2 The installation of this boiler must be carried out in accordance with the relevant requirements of the gas
safety (installation and use) Regulations 1984, the I.E.E. Wiring Regulations and the Bylaws of the Local
Water Undertaking, and the Building Regulations 1985.
Detailed recommendations are contained in the following:
British Standard Code of Practice CP. 341 : 300-307 ; CP 342 : Parts I and 2 : BS. 5440 parts 1 & 2 :
BS.5854 : BS. 6644 :BS. 6798 : BS. 6891 and British Gas Publications :- IM/11 Flues for Commercial and
Industrial Gas Fired Boilers an Air Heaters
"The Gas Safety (Installation and Use) Regulations 1984:
It is the law that all gas appliances are installed by CORGI registered contractors in accordance with the
above regulations. Failure to install appliances correctly could lead to prosecution. It is in your own
interest, and that of safety, to ensure that the law is complied with".
2.0 LOCATION
2.1 The boiler must stand on a level non combustible base, which is capable of adequately supporting the weight
of the boiler, water content an any ancillary equipment.
The location chosen for the boiler must permit the provision of a satisfactory flue and termination.
The location must also permit an adequate space for combustion and ventilation purposes (see Section 3 on
Ventilation) and adequate space for servicing and air circulation around the boiler.
3.0 VENTILATION
3.1 It is important that there are sufficient areas of air inlet and ventilation provided to the boiler room detail
recommendations for air supply are given in BS. 5440 part 2 & BS. 6644. The following notes are intended
to give general guidance.
3.2 Natural Ventilation.
Where both low- and high-level openings are used, the grilles shall have a total minimum free area as
follows:
Low level (inlet): 540 cm² plus 4.5 cm² per Kilowatt in excess of 60 kW total rated input;
High level (inlet): 270 cm² plus 2.25 cm² per Kilowatt in excess of 60 kW total rated input.

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3.3 Mechanical Ventilation.
The minimum quantity of air required for combustion and boiler house ventilation shall be supplied at a
minimum flow rate in accordance with BS. 6644.
All air inlet and extract fans shall be fitted with automatic controls causing safety shut-down or lockout of
the boiler(s) in the event of the inlet or extract air flow failing.
4.0 GAS SUPPLY
4.1 An existing meter should be checked preferably by the Gas Supplier, to ensure the meter is adequate to deal
with the rate of gas required.
4.2 Pipework from the meter to the boiler must be of adequate size. Pipes of smaller size than the boiler inlet gas
connection should not be used. All gas pipework should be fitted and on completion of installation tested, in
accordance with BS. 6891 : IGE/UP/2 Gas Installation Pipework, Boosters and Compressors on Industrial
and Commercial Premises.
4.3 Gas supply connections is as follows:
Geneva PV 3 & PV 4 = 1/2" BSP
Geneva C 3, C 4, C 5, C 6 & C 7 = 1/2" BSP
Geneva C 8 & C 9 = 1" BSP.
4.4 A gas service cock must be fitted immediately adjacent to the boiler.
5.0 FLUE SYSTEM
5.1 Detail recommendations for flueing are given in B.G.C. Publications:- “Flues for commercial and Industrial
Gas Fired Boilers and Air Heaters” 1M/11.
Reference should also be made to BS. 5440 Part 1 : BS. 6644 where applicable.
The following notes are intended to give general guidance.
5.2 The nominal flue size should not be less than that of the boiler flue connection, and must be at least
equivalent to a vertical height above the boiler outlet of 1 M (3 ft 3 in), due allowance being made for any
horizontal or inclined length, and consideration being given to the position of the outlet.
The boiler flue hood is not load bearing and the flue must be supported independently. The flue should be
easily disconnected for servicing.
6.5 WATER CIRCULATION SYSTEM
6.1 Flow and return connections are from the back of the boiler with BSP connections.
6.2 In combined heating and hot water systems the hot water storage vessel must be of the indirect cylinder or
calorifier type.
6.3 The boiler maximum working pressure is 3 Bar (43.5 Psi) for ‘PV’ models and 4 Bar (58 Psi) for ‘C’ models
which includes pump circulation head. The minimum head being 1 meter above the top of the boiler.
6.5 Hydraulic Resistance and Flow Rates
The differential temperatures across the flow and return water connections to the boiler is recommend as
10°C temperature difference (Max. temperature difference 20°C).
Water flow rates and water pressure drops across the boilers are detailed on Table 1.
6.6 If three-way mixing or diverting vales are installed in the systems they should not be of such a type that the
flow through the boiler is totally closed. If such valves are used, a by-pass should be fitted.

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7.0 ELECTRICAL SUPPLY
The electrical supply should be 220/250V, 50Hz, and fused at 3 amps. A suitable independent switch fuse
should be installed for each boiler, adjacent to the boiler.
WARNING : This appliance must be earthed.
7.1 GENEVA ‘C’ & ‘PV’ SCHEMATIC WIRING DIAGRAM
With Electronic Ignition.
Legend.
A. ON/OFF SWITCH I. IGNITION ELECTRODE
B1. LOCK-OUT LAMP L. CONTROL BOX
B2. FLUE GAS SPILLAGE DETECTOR LIGHT N. MAINS IN (230 VOLTS)
C. FUSE 6.3 Amp O. TIME SWITCH CONNECTIONS
D. FLUE SPILLAGE DETECTOR P. PUMP INTERLOCKS (PV MODELS)
E. BOILER CONTROL THERMOSTAT Q. ROOM THERMOSTAT (WHERE FITTED)
F.
G. BOILER LIMIT THERMOSTAT GAS VALVE R. GAS DIFFERENTIAL PRESSURE SWITCH (C 8 & C 9)
H. FLAME DETECTION PROBE S. GAS SAFETY VALVE (C 8 & C 9)

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8.0 INSTALLATION
8.1 The boiler is delivered assembled, on a wooden crate with protection for transportation and site positioning.
Do not remove protection before final positioning.
8.2 The boiler jackets and control panel are fitted.
8.3 The following minimum clearances around the boiler, for installation and servicing purposes, are
recommend:
Above the top of the boiler (space for cleaning the flueways) 600mm, one side of the boiler should allow
access of 500mm.
In addition a minimum clearance of 350mm should be available at the front of the boiler to enable servicing
to be carried out.
8.4 BOILER DIMENSIONS
GENEVA ‘C’
MODEL ‘C’ 3 4 5 6 7 8 9
DIMENSIONS MM
L 365 450 600 750 750 900 900
P 600 600 600 650 650 705 705
Ø A 1" 1" 1" 1 1/4" 1 1/4" 1 1/4" 1 1/4"
Ø B 1" 1" 1" 1 1/4" 1 1/4" 1 1/4" 1 1/4"
Ø C 1/2" 1/2" 1/2" 1/2" 1/2" 1" 1"
G 135 205 205 335 335 405 405
H 80 80 90 105 105 125 125
Ø I 130 130 150 180 180 220 220
M 40 40 115 80 80 80 80
N 40 40 115 55 55 55 55
O 70 70 150 55 55 55 55
Q 160 160 160 150 150 150 150
R 540 540 540 550 550 550 550

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GENEVA ‘PV’
MODEL ‘PV’ 3 4
DIMENSIONS MM
L 365 450
G 135 205
H 80 80
Ø I 130 130
M 40 40
CIRCULATING PUMP CHARACTERISTIC

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9.0 COMMISSIONING AND TESTING
Before commencing to commissioning the boiler, check the following:-
9.1 Electrical
Electrical supply is switched off.
All electrical connections are sound and correctly made.
Electrical system is correctly earthed.
9.2 Gas Supply
Gas supply is purged of air, and tested for soundness as described in BS. 6891 : IGE/UP/2 Gas Installation
Pipework, Boosters and Compressors on Industrial and Commercial Premises.
All appliance gas cocks are turned off.
Gas supply is on at meter.
9.3 Water
Boiler and system have been flushed through and are filled, and circulating pumps operational.
Flow and return valves are open.
9.4 To Test Soundness of Safety Shut-Off Valve
1. Ensure that the main gas cock and electricity supply are turned OFF.
2. Remove plug from pressure test point on inlet side of the safety shut off-valve and connect pressure gauge.
3. Turn ON main gas cock to pressurise the system up to the seat of the safety shut-off valve.
4. Turn OFF main gas cock, leave for two minutes checking for any drop in pressure on the gauge. If any
pressure loss is observed, re-pressurise by opening and closing the main gas cock, and test the assembly
for leaks using a leak detector solution.
5. If no external leaks are detected and loss of pressure occurs, this is the result of a let-by at the safety shut-
off valve.
9.5 To Light The Boiler
9.5.1 Fully Automatic Models (see Fig. 2 & 3)
1. Connect pressure gauge to burner pressure test point.
2. Switch on mains electrical supply.
3. Turn ON main gas cock.
4. Depress reset button on limit thermostat to ensure stat is “made”.
5. Set control thermostat to required temperature and push button “I” (on control panel) to the ON position.
6. After switching on, ignition spark should appear, followed by ignition of the main burner at pilot setting .
If flame is not established control box will lock out in approximately 5 seconds. This may occur in
initial start due to air in the gas line. The control box may be reset after a delay of approximately 15
seconds by pressing the red button (B1) on the control panel, the red light should go out.
7. When pilot flame is satisfactory the gas valve will open to main flame.
8. Check main burner pressure (as per TABLE 1).
Adjust burner pressure on gas control if necessary.
Burner pressure should be rechecked after about 30 minutes of operation and adjusted if necessary.
9. Switch Off electrical supply with button “I” (on control panel). Check that main burners are extinguished.
Remove pressure gauge and replace plug in test point.
9.6 All Models
After lighting the boiler as described above, the operation of the thermostat should be checked. All gas lines
should be re-checked for soundness, using a leak detector solution.
The gas rate should be checked at the meter, but unless this differs significantly from the rated heat input
quoted in TABLE 1, the setting pressure given should be maintained.
9.7 LPG
If gas conversion is required refer to Fig. 4.

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10.0 SERVICING
Before servicing the boiler, switch off electricity supply and then turn off main gas cock.
10.1 To Clean Boiler
1. Remove jacket front panel.
2. Disconnect pilot line.
Fully Automatic Models: Disconnect leads for ignition and probe electrodes
3. Remove nuts retaining burner door and assembly.
4. Withdraw burner assembly from boiler.
5. Remove jacket top panel and insulation.
6. Remove the access plate from the top of flue hood.
7. Clean burner (see 12.2).
8. Clean boiler flueways from the top with flue brush. After cleaning, sweep all debris from under the boiler.
9. Check ignition and probe electrodes (fully automatic models) for correct alignment.
10. Re-assembly is a reversal of the above procedure.
10.2 To Clean Burners
1. Remove burner assembly from boiler as described in 12.1
2. Release screws holding burners.
3. Lift burners at rear and withdraw off injectors.
4. Brush out inside of burners and clean off outside surfaces.
5. Inspect injectors and sealing washers on manifold. Replace if necessary.
6. Re-assembly is reversal of the above procedure.
7. Check electrical connections to electrodes, and electrodes for correct alignment.
10.3 Test Soundness of Safety Shut-Off Valve
Proceed as detailed in 11.4
10.4 Re-commission boiler as described in Section 10
11.0 FAULT FINDING
11.1 Fully Automatic Models
1. Boilers does not attempt to light. Control box does not lock out
(a) No electrical supply to boiler, time switch and other external controls.
(b) Limit thermostat tripped.
(c) Control thermostat set to low.
(d) Control fuse blown.
(e) Faulty thermostat connections.
(f) Faulty control box.
2. Ignition sparks. Pilot stage does not light and control box locks out.
(a) Gas supply turned off at meter.
(b) Air in gas supply line.
(c) Solenoid valve or connections.
(d) Lead not plugged into junction box.
3. No ignition spark. Control box lock out.
(a) H.T. lead disconnected or faulty.
(b) Ignition electrode incorrectly set. Distance between ignition and ground electrode should be about 3
mm.
(c) Faulty electrode.
(d) Faulty igniter or connections.
(e) Faulty control box.
4. Pilot stage lights, Control box locks out.
(a) Probe lead not connected to electrode.

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(b) Earth lead to burner not connected.
(c) Loose connections on probe lead or earth lead in junction box, control panel or plugs and sockets.
(d) Faulty Control box.
(e) No earth connection on incoming supply.
Note: The probe circuit may be tested with a micro ammeter connected in the probe lead. A reading of al lest
10 micro-amps should be recorded when the burner is alight.
5. Pilot stage lights. Main burners do not light. Control box does not lock out.
(a) Faulty connections to main valve.
(b) Faulty main gas valve.
(c) Faulty control box.
6. Noisy burner ignition
(a) Improper distance between electrode and burner.
(b) Faulty electrical connection of the electrode.
(c) Low gas pressure at the burner.
11.2 All Models
1. Presence of flue gases in the room.
(a) Flue size inadequate.
(b) Restriction in the flue.
2. Presence of unburnt fuel in the room.
(a) Boiler needs cleaning.
(b) Insufficient room ventilation.
3. Early soot formation in the boiler.
(a) Excessive consumption.
(b) Insufficient air supply.
4. Condensation
(a) Insufficient boiler output
(b) Boiler control thermostat setting to low.
(c) Main burner pressure to low.

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Fig. 1
GENEVA ‘C’ & ‘PV’ BOILERS
CONTROL PANEL LAYOUT
LEGEND
1 On / Off
Switch
2 Boiler Control Thermostat
3 Boiler Thermometer (Plus Boiler Pressure Gauge On ‘PV’ Versions)
4 Flue Gas Spillage Detector Light (B2)
5 Control Box Lock Out Light And Reset Button (B1)
6 Flue Gas Spillage Detector Reset (E2)
7 Boiler High Limit Thermostat Reset (E1)
Fig. 2 NOVA SIT 822 GAS VALVE
Inlet pressure test screw
Burner-pressure test screw
Burner-pressure regulator

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Fig. 3 ELEKTROGAS VM-L GAS VALVE
Slow Opening and Fast Closing Valve with Hydraulic Damper and Flow - Rate Control
- Slow opening time : It can be regulated from a fast speed of 4 sec, to a slow speed of 25 sec. (Valves
are delivered with a standard opening time of 10 - 12 seconds).
- Initial fast opening, followed by a slow opening : it can be regulated from 0 to 100 % of the whole lift.
B
C
A
ELEKTROGAS VM-L GAS
VALVE
Governor spring
Inlet pressure test screw
Governor
Burner pressure test screw
AOpening Time
Regulation
Slow opening valves are supplied with an opening time of 10 - 12 seconds.
By fully unscrewing the speed adjustment screw (anti-clockwise) the valve will open quickly in about 4
seconds.
By gradually turning the speed adjusting screw (clockwise) the opening time can be slowed up to about 25 -
30 seconds.
NOTE : Remove the red plastic cap to carry out following settings.
B Regulation of an Initial Quick - Opening Interval Followed by a Slow - Opening Interval
The initial quick interval can be regulated from 0 to 100 % of the whole valve movement, by acting on the
slow opening adjustment screw.
Valves are supplied with the screws completely closed and therefore with a slow shutter run.
When the screw is in a closed position and then gradually opened (anti-clockwise), each complete turn is
equal to an initial part of the fast run of 1 mm.
C Flow Regulation
The flow regulation screw (located inside screw B) stops the shutter, which can be stopped at any point of
the run. When the regulation screw is in the closed position (shutter stopped against the valve seat with zero
flow) and is gradually opened (anti-clockwise) the shutter can be raised 0.8 mm at each complete turn.
Fig. 4

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LPG CONVERSION
The boilers are supplied as standard to be run on natural gas. Should it be necessary to convert the boiler to
LPG the following operations must be carried out :
1. Remove jacket front panel.
2. Switch off electrical supply.
3. Turn off main gas cock.
4. Substitute the injectors on the main burner.
5. Nova Sit 822 gas valve : Remove the burner-pressure regulator cover and screw the governor spring fully
in, replace the cover with blank supplied.
Elektrogas VM-l gas valve : Replace the governor spring with the one supplied.
6. Test for soundness.
7. Re-commission boiler as described in section 11. Using LPG burner pressure as stated in Table 1.
NOTE : The gas supply pressure to the boiler should not exceed the pressure as stated in Table 1.

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The company reserves the right to change the specification and dimensions without prior notice 6/96
STREBEL Ltd.
1F, Albany Park Industrial Estate
Frimley Road, Camberley
Surrey GU15 2PL
Telephone : [phone]
Fax: : [phone]