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Summary of Contents for Strebel S-ASX 30
- Page 1 STREBEL S-ASX Air Source Heat Pump Models 30 – 35 – 40 – 45 - 50 Installation, Operating & Maintenance Manual Please read and understand before commencing installation and leave the manual with the customer for future reference. 2021-06-01 v1...
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Page 3: Table Of Contents
6.1.1 Transport Weight ....................... 20 Installed – Dry Weight ....................... 20 6.1.2 Installed – Filled Weight ....................20 6.1.3 S-ASX 30 – 50: DHW 3 W ....................20 ALVE NOISE LEVELS ............................20 PRESSURE DROP ............................ 21 ..........21 RESSURE... - Page 4 13.2 ......................28 YDRAULIC ONNECTIONS 13.3 ....................29 ONDENSATE RAIN ONNECTION – F 13.4 ................29 LYCOL OLUME REEZING EMPERATURES – P 13.5 ............... 29 INIMUM ATER ONTENT RIMARY EATING IRCUIT 14 ELECTRICAL INSTALLATION ......................... 30 14.1 ............................30 ENERAL 14.2 ..........................
- Page 5 19 DOMESTIC HOT WATER MANAGEMENT ....................59 20 CASCADE CONTROL ..........................60 20.1 .......................... 60 ASCADE IRING 20.1.1 Cascading S-ASX 30-50 Heat Pumps Together ............... 60 20.1.2 Master Unit Wiring ......................61 20.1.3 Slave Unit Wiring ....................... 61 20.2 ......................... 62...
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Page 6: Introduction
The following symbol is used in this manual: Warning: Important information concerning the safety of persons and/or the appliance. Strebel Ltd is not accountable for any damage caused by incorrect following the mounting instructions. For service and repair purposes use only original Strebel spare parts. -
Page 7: Declaration Of Conformity
The installation must be carried out in accordance with the following regulations plus relevant codes & standards: Due consideration must be given to current Health & Safety Legislation while this product is being installed. Key Approved Documents to the Building Regulations, in the region of the United Kingdom that this product is being installed. -
Page 8: General Information
2 GENERAL INFORMATION Unit Description This series of air to water S-ASX heat pumps satisfies the heating and domestic hot water production requirements of installations of small and medium size. The possibility to produce up to 65c temperatures makes these units particularly suitable to radiators circuits as well as to fan coil and under floor heating circuits. All the units are suitable for indoor and outdoor installation. - Page 9 The 4 Way Valve (6): The 4 way valve changes the direction of flow for the defrost cycle. Liquid Receiver (7): To compensate the different refrigerant charge required in heating and pressure connections SAE 5/16” – UNF ½” – 20 equipped with pin, gasket and blind nut, as required for the use of R410A refrigerant (they allow the complete check of the refrigerant circuit: compressor inlet pressure, compressor outlet pressure and expansion valve upstream pressure).
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Page 10: Technical Specifications
3 TECHNICAL SPECIFICATIONS Frame Model U.M. Power supply 400 -3N- 50 400 -3N- 50 400 -3N- 50 400 -3N- 50 400 -3N- 50 V-ph-Hz Refrigerant Type R410A Total Volume 11.5 11.5 Compressor Type Scroll with vapor injection (EVI) Quantity n° Power steps 0 - 100 Oil charge... -
Page 11: Performance Data
Performance Data 3.1.1 EMPERATURE OF Frame Model U.M. Power supply V-ph-Hz 400 -3N- 50 400 -3N- 50 400 -3N- 50 400 -3N- 50 400 -3N- 50 Heating A7W35 (Source: Air in 7°C d.b. 6°C w.b. / Plant: Water in 30°C out 35°C) Heating capacity 29.2 34.4... -
Page 12: Flow Temperature Of 45C
3.1.2 EMPERATURE OF Frame Model U.M. Power supply V-ph-Hz 400 -3N- 50 400 -3N- 50 400 -3N- 50 400 -3N- 50 400 -3N- 50 Heating A7W45 (Source: Air in 7°C d.b. 6°C w.b. / Plant: Water in 40°C out 45°C) Heating capacity 29.6 34.8... -
Page 13: Flow Temperature Of 55C
3.1.3 EMPERATURE OF Frame Model U.M. Power supply V-ph-Hz 400 -3N- 50 400 -3N- 50 400 -3N- 50 400 -3N- 50 400 -3N- 50 Heating A7W55 (Source: Air in 7°C d.b. 6°C w.b. / Plant: Water in 47°C out 55°C) Heating capacity 30.0 35.3... -
Page 14: Flow Temperature Of 65C
3.1.4 EMPERATURE OF Frame Model U.M. Power supply V-ph-Hz 400 -3N- 50 400 -3N- 50 400 -3N- 50 400 -3N- 50 400 -3N- 50 Heating A7W65 (Source: Air in 7°C d.b. 6°C w.b. / Plant: Water in 55°C out 65°C) Heating capacity 30.7 36.1... -
Page 15: Erp Specification Datasheet
ErP Specification Datasheet Data declared according to the European Regulation 811/2013 Model: S-ASX 30 S-ASX 35 S-ASX 40 S-ASX 45 S-ASX 50 Air to Water Heat Pump: Water to Water Heat Pump: Brine to Water Heat Pump: Low Temperature Heat Pump:... -
Page 16: Dimensions & Clearances
4 DIMENSIONS & CLEARANCES Dimensions With the S-ASX 30 to 50 heat pumps, there are 2 configurations on the air suction and air expulsion available for an outdoor installation. – S 4.1.1 & S UCTION XPULSION TANDARD UPPLY – A 4.1.2... -
Page 17: Required Clearances
Required Clearances To guarantee the correct operation and accessibility to facilitate full maintenance procedures, please ensure the free area around the appliance is as shown below to all models. 600 mm 600 mm 700 mm – S 4.2.1 & S UCTION XPULSION TANDARD... -
Page 18: Standard Supply, Additional Options & Accessories
5 STANDARD SUPPLY, ADDITIONAL OPTIONS & ACCESSORIES Standard Supply The following items and software are supplied as standard with each S-ASX 30 -50 air source heat pump: • 1 x Complete ASHP as described in chapter 2.2: Pre-fitted, pressure tested and pre-charged. -
Page 19: Additional Options
Additional Options Depending on the installation requirements , we can provide additional options to be installed within the appliance casing to facilitate. These options will need to be ordered with the appliance so that they can be fitted in our factory on building the appliance. -
Page 20: Weights
S-ASX 30 – 50: DHW 3 Way Valve If the internal DHW 3 way valve option is added to the S-ASX 30 - 50 air source heat pumps, then the below weight must be added to the above weights to confirm a total weight:... -
Page 21: Pressure Drop
8 PRESSURE DROP Pressure Drop Through Heat Pump Plate Heat Exchanger The below table shows the pressure drop through the system side of the plate heat exchanger for all five models: Pressure Drop Through DHW 3 Port Valve The below table shows the pressure drop through the DHW 3 port valve:... -
Page 22: System Pump Selection & Operating Limits
9 SYSTEM PUMP SELECTION & OPERATING LIMITS System Pump Selection We offer two pump selections which will need to be confirmed on ordering the heat pump as this pump is fitted within the heat pump housing and wired up to the heat pump control panel. The selections of pumps are the “modulating” model (standard supply) or a “high head”... -
Page 23: Operating Limits - Deltat
This graph is refered to the unit operating with a temperature at 10c (Density 1000 kg/m3) Example - S-ASX 40 at 45c flow temperature at 7c air temperature: Flow rate = 7,716 l/h Pump head available = Approx. 115 kPa Pressure drop through DHW 3 port valve = Approx. -
Page 24: Corrective Factors
10 CORRECTIVE FACTORS 10.1 Heating Performances... -
Page 25: Taking Delivery Of The Heat Pump
11 TAKING DELIVERY OF THE HEAT PUMP 11.1 Receiving The heat pump is supplied on a pallet suitable to withstand the transport weight and is wrapped in protective packaging. As soon as the unit is received, immediately check its integrity. All heat pumps are tested and will only be released from our factory once it has passed all testing therefore the heat pump leaves our factory in perfect condition. -
Page 26: Postioning For Installation
With an indoor installation, air ducts must be fitted to the air supply and air exhaust connections. The required ducting is a non Strebel supply. The ducting must run from the heat pump direct to outside air. This will need to be supplied and sized by a specialist – see chapter 12.4. -
Page 27: Plinth / Base
Plinth / Base It is recommended that the S-ASX 30 – 50 heat pump is installed on a mounting plinth / base, levelled perfectly horizontal, with a size similar to the heat pump footprint and must be able to support the overall filled weight listed... -
Page 28: Hydraulic Installation
Pipework Insulation: All interconnecting pipework must be insulated with appropriate and correct thickness insulation. 13.2 Hydraulic Connections The below drawing with table confirms the location and sizes of the hydraulic connections on the heat pump. Model: S-ASX 30 S-ASX 35 S-ASX 40 S-ASX 45 S-ASX 50 Type 1 = System Return –... -
Page 29: Condensate Drain Connection
All S-ASX 30 -50 heat pump models come with a condense tray within the casing to collect condense generated by the finned coil when in operation. -
Page 30: Electrical Installation
14.1 General All S-ASX 30 – 50 air source heat pumps are shipped with all internal components within the casing factory wired up to the main heat pump controller ready for the mains power supply to be connected. The mains power supply cables must enter the heat pump through the holes on the lateral support and must be connected to the power supply terminals of the unit. -
Page 31: Main Controller - Siemens Rvs21.826 With Avs55.199
Extension Modules – Siemens AVS75.370 14.4 Two extension modules are supplied, fitted, and prewired per S-ASX 30-50 heat pump as shown within chapter 14.3. A maximum of on further extension modules can be fitted = 3 in total. -
Page 32: Sensor Values
14.5 Sensor values There are two types of NTC sensors that work with the S-ASX heat pumps: SENSOR TYPE SENSOR VALUE Temperature Sensor NTC-10K Outside Air Sensor NTC-1K 14.5.1 EMPERATURE ENSOR Conversion table temperature v Resistance all sensors except outdoor sensor = NTC-10k Temperature Resistance Temperature... -
Page 33: Inputs And Outputs
14.6 Inputs and Outputs The following tables shows the list of the inputs and outputs on the main controller of the heat pump with the pected settings. Some inputs and outputs can be configured in a different way onsite to manage other plant compo- nents which are not within the heat pump casing –... -
Page 34: Avs75.370 (Mod3) - Inputs
AVS75.370 (MOD3) – I 14.6.5 NPUTS Available for Description Features the User BX21 Outdoor air temperature sensor Temperature sensor NTC 1K BX22 Compressor inlet temperature Temperature sensor NTC 10K Compressor inlet pressure 0-10 Vdc input Voltage free digital input; Or 0-10 Vdc input EX21 E5/E6 Low tariff / Electrical utility lock... -
Page 35: Basic Setup Examples
15 BASIC SETUP EXAMPLES 15.1 1 x S-ASX ASHP to 1 x Thermal Store Drawing Number Part Description Outside Air Temperature Sensor Thermal Store / Buffer Vessel Flow Temperature Sensor Thermal Store / Buffer Vessel Return Temperature Sensor 15.2 1 x S-ASX ASHP to 1 x Thermal Store & 1 x Indirect DHW Cylinder Drawing Number Part Description Outside Air Temperature Sensor. - Page 36 15.3 2 x S-ASX in Cascade to 1 x Thermal Store & 1 x Indirect DHW Cylinder Drawing Number Part Description Outside Air Temperature Sensor Common Flow Temperature Sensor DHW Three Way Valve DHW Secondary Circulation Pump DHW Immersion Heater DHW Tank Temperature Sensor Thermal Store / Buffer Vessel Flow Temperature Sensor Thermal Store / Buffer Vessel Return Temperature Sensor...
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Page 37: Start Up
16 START UP The following must be carried out only by properly trained personnel / engineer. 16.1 Preliminary Checks Before Turning On Verify that: 1. The unit has not suffered visible damages due to transport or positioning. 2. The unit is placed on a horizontal surface able to bear its full operating weight. 3. -
Page 38: User Interface / Remote Controller
17 USER INTERFACE / REMOTE CONTROLLER The remote controller supplied per installation is the Siemens QAA74 controller. This controller should be used as only an “operator unit” with the S-ASX heat pumps to change settings / parameters. An external control system will be required to create a heat demand signal. 17.1 Remote Control Design 17.1.1... -
Page 39: Technical Specifications
17.2 Technical Specifications Power supply Via bus (2-wire) Bus power BSB Via controller (3-wire) DC 12 V (to connection G+ on the controller) With external power supply (3-wire) DC +12 V - Power consumption SELV 36 mA - Power limitation (external power supply) Wiring of terminals Power supply and bus... -
Page 40: Dimensions
17.3 Dimensions Overall dimension of the Siemens QAA74 controller. Unit Controller Model Siemens QAA74 Length: Height: Depth: 27.6 17.4 Installation of the User Interface / Remote Controller To install the controller, the following is required: At least 3 to a maximum of 7 screws. Maximum screw diameter = 3.5mm. -
Page 41: Fitting The Mounting Plate To A Surface
17.4.2 ITTING OUNTING LATE URFACE Use the drilling template within the installation guide supplied with the product. For stability purposes, at a minimum, include the screws highlighted by the arrows shown below. Additional screws maybe required if the connection between the mounting plate and mounting surface is not sufficient. For surface mounting, maintain at least a 10mm between the top edge of the mounting plate and the end of the cable duct. -
Page 42: User Interface / Room Controller Wiring
17.4.3 NTERFACE ONTROLLER IRING The required cable ends are as below: Terminal assignment: User Interface / Room Controller Terminal Number Siemens RVS61.843 Terminals G+ (+12v DC Supply) CL- (GND) CL+ (BSB) Remove the cable access panels from the controller: Connect the cables to the controller: Rigid cables are easier to mount on the green screw terminals, if the terminals are already snapped on... -
Page 43: Uninstall User Interface / Room Controller
Connect the room controller cables to the main Siemens RVS21.826 controller on the bottom input rail, terminals 5,6 & 7 under X86 (G+, CL-, CL+). Located below by the arrow. Once the wiring has been completed, insert the top of the user interface / room controller into the top of the mounting frame. -
Page 44: Basic Information
17.5 Basic Information The user interface / room controller starts up automatically as soon as the controller is supplied with power and begins to communicate with the main controller. 17.5.1 & D PERATING LEMENTS ISPLAY 1. Control Knob (Push and Rotate). 2. -
Page 45: Navigating & Setting Using The Control Knob
17.5.3 & S AVIGATING ETTING SING THE ONTROL The icons within the navigation bar can have three states: Not selected: The operating object is displayed normally, black on white background. Preselected: The operating object is framed. Selected: The operating object is inverted with white on black background. To go through the navigation bar: Turn control knob. -
Page 46: Symbol Meanings
17.5.4 YMBOL EANINGS The following symbols are located within the navigational bar: Accessible for end-user and experts: Start page: Plant status. Access to plant switch (or zone switch). Temperature page. Access to heating. Ventilation page. Access to ventilation. Domestic hot water page. Access to hot water handling. Info pages: •... -
Page 47: Basic Menu Structure
17.5.5 ASIC TRUCTURE The room controller basic menu structure showing various types of application. Type of application/User/View Example display Structure and handling Daily use Main functions: Direct page access. End-user End-user view (without Info pages: Sorted by plant components. Scroll access protection) by selected page titles. -
Page 48: User Operation
17.6 User Operation You can conduct the operating steps described below on either a room unit or operator unit. Differences between the information provided on the operator and room unit are limited to the following areas: • The room units start page ( ) presents the values relevant to the room. -
Page 49: Commissioning The Controller Using The Wizard
17.7 Commissioning the Controller Using the Wizard NOTICE Startup response of the commissioning wizards. ● Depending on the controller, operating line 39 (OEM) of the room/operator unit-specific section or the entire commissioning wizard can be suppressed at initial power-up (initial commissioning). ●... -
Page 50: Time Of Day And Date
User Level Key within Table: • E = End User. • I = Commissioning. • F = Heating Engineer. • O = Expert Level The below table lists room and operator unit parameters Operating Line (one-up) User Level Function [value range] Standard Unit Time of Day and Date... -
Page 51: Operator Section
17.7.2 PERATOR ECTION 17.7.2.1 Parameters 20 & 30 Operating line Settings Language English, Deutsch, Français, Italiano, Nederlands, Español, Português, Dansk, Suomi, Svenska, Polski, Słoweński, Český, Slovenčina, Pyccknn, Magyar, Ελληνική, Türkçe, Serbian, Lietuvių Commissioning menu Off ¦ On • Language: Select language. •... -
Page 52: Operate Service / Setting
17.7.2.4 Parameters 50 to 59 – Room Sensor Operating line Settings Room temperature Room temperature min Room temperature max Readjustment room sen- sor (Temperature). Room humidity Readjustment room sensor (Humidity). * Operating lines only available on QAA74. QAA74 must be configured as room unit. The above setting will only be required if the user interface is addressed as a “room unit.”... -
Page 53: Special Operations / Settings
The OEM under the Expert level allows the engineer for full diagnostics, complete parameter access and to start the commissioning wizard This must not be accessed by the onsite user – please contact Strebel Technical if this is required to be accessed without an expert / engineer onsite. - Page 54 Complete the same process for the rest of the 5 digit OEM password. You will receive feedback on a successful login, that you confirm with “continue.” 11. The user symbol ( ) with the corresponding level is displayed on the status bar. Within the expert level, there are two additional chapters: Diagnostics Adjust / Repair...
- Page 55 The maintenance symbol on the status bar indicates that an output test is active. You can see the present output value at the value for “Output signal UX1.” A unit is indicated below the value (e.g. voltage V). Conclude Output Test Conclude the output test as follows if the testing of the output is completed: Press the control knob to select the test value.
- Page 56 To navigate through the complete parameter list, complete the following: Turn the control knob and select ‘Complete parameter list.’ Press the control knob. The ‘Complete parameter list’ opens – the title of the first parameter list page is preselected. Press the control knob and select the title of the parameter list page. Turn the control knob and go to additional technology topics.
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Page 57: On / Off Demand Signal For Heat Pump
18 ON / OFF DEMAND SIGNAL FOR HEAT PUMP There are two control methods to turn on / off the heat pump: Volt free open / close – terminals M & H1. 0-10v on temperature control – terminals M (-) & H1 (+). Both controls are wired back to the main heat pump controller to the same terminals. -
Page 58: Climatic Curves Based On Outdoor Air Temperature
18.1.2 LIMATIC URVES ASED ON UTDOOR EMPERATURE The heating setpoint is calculated based on the outside temperature via the outdoor air temperature sensor. To select the curve, the two below parameters as well as parameter 740 & 741 must be set: Parameter 720: Heating Curve Slope Each slope value identifies one of the different curves shown in the above diagram. -
Page 59: Domestic Hot Water Management
19 DOMESTIC HOT WATER MANAGEMENT The domestic hot water (DHW) is controlled by a water temperature sensor (B3) installed into the DHW cylinder and 2 different setpoints (nominal & reduced) enabled as a function of the selected switch mode (24 h/day) or as a function of a hourly program switch for DHW). -
Page 60: Cascade Control
When using the cascade control, the demand signal, temperature sensors, DHW three way valve and any immersion heaters need to wired to back to the ‘master’ heat pump. The following setup example is for a 2 x S-ASX 30-50 cascade setup: Drawing Number... -
Page 61: Master Unit Wiring
20.1.2 ASTER IRING The below wiring shows the wiring of the demand signal, temperature sensors, DHW three way valve and immersion heater. Drawing Number Part Description DHW Three Way Valve DHW Secondary Circulation Pump S-ASX Internal Circulating Pump (Pre-fitted & Wired) DHW Immersion Heater Thermal Store / Buffer Vessel Flow Temperature Sensor Thermal Store / Buffer Vessel Return Temperature Sensor... -
Page 62: Cascade Parameters
20.2 Cascade Parameters Once all the cascade wiring has been completed as per chapter 20.1, before giving the master heat pump a heat demand, the following parameters within all heat pumps will need set: Parameter Description Default Setting Unit Lead Strategy Late on, late off Output Band (Min) Output Band (Max) -
Page 63: Max Source Force Charge Ot (3517)
20.2.5 OT (3517) OURCE ORCE HARGE Defines the attenuated outside temperature at which the maximum number of generators are released. During forced charging, at least one generator is always released. Additional generators are released in a linear manner, depending on the temperature differential of 15 °C, "Max source force charge OT", and the attenuated outside temperature. 20.2.6 (3518) UMBER... -
Page 64: Substitute Common Flow Temperature (3538)
20.2.11 (3538) UBSTITUTE OMMON EMPERATURE If a common flow sensor B10 is not connected, the cascade flow temperature is calculated depending on the setting of parameter "Substitute common flow temp." There are 4 options available: None - No backup temperature is used for the cascade flow temperature. If a cascade is installed, the order the cascade operates is calculated solely based on the output balance. -
Page 65: Fault & Run Indication
21 FAULT & RUN INDICATION With the S-ASX 30-50 heat pump controller, there is no specific terminal number for either a fault or run indication. However as per chapter 14.6 “Input and Output,” there are QX outputs available as a spare which can be addressed for fault &... -
Page 66: Fault / Alarm Code Table
22.3 Fault / Alarm Code Table Fault Code Fault / Alarm Description Reset Input Heat Pump Lock Outdoor Air Temperature Sensor Flow Sensor Solid Fuel Boiler Common Flow Sensor Flue Gas Sensor Flow Sensor Heating Circuit 1 Flow Sensor Heating Circuit 2 Heat Pump Flow Sensor Plant Side Heat Pump Return Sensor Source Side Compressor 1 Outlet Sensor... - Page 67 Fault Code Fault / Alarm Description Reset Input Heat Pump Lock H3 / H33 Alarm Contact 4 Active Water Pressure 2 too High Water Pressure 2 too Low Limit Thermostat Heating Circuit 1 Limit Thermostat Heating Circuit 2 Frost Alarm Fan Overload A / M High Pressure in Heat Pump Operating Mode...
- Page 68 Fault Code Input Heat Pump Lock Fault / Alarm Description Reset E21 / E22 / E23 Power Supply Voltage Asymmetric A / M Plant Side Flow Switch A / M Soft Starter Compressor 1 A / M Reversing Cycle Valve Y22 Missing Sensor B91 Missing Sensor B92 Missing Sensor B84 Missing...
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Page 69: Maintenance
23 MAINTENANCE MAKE SURE THE UNIT IS NOT ELECTRICALLY POWERED BEFORE CARRYING OUT ANY CLEANING OR MAINTENANCE OPERATION. ALL ORDINARY AND EXTRAORDINARY MAINTENANCE OPERATIONS MUST BE CARRIED OUT BY SPECIALIZED AND AUTHORIZED PERSONNEL, IN ORDER TO ENSURE COMPLIANCE WITH THE CURRENT SAFETY REGULATIONS. -
Page 70: Safety And Pollution
24 SAFETY AND POLLUTION 24.1 Accessing the Heat Pump The access to the unit must be granted exclusively to qualified personnel trained to operate on this type of units and provided with the necessary protection equipment. Moreover, such personnel, to operate, must be authorized by the owner of the unit and recognized by the Manufacturer. -
Page 71: Fire Prevention Measures
24.4.5 REVENTION EASURES Specific Hazards: Increase in pressure. Dangerous Fumes: Halogen acids, traces of carbonyl halides. Fire-Extinguishing means Usable: All the known fire-extinguishing means can be used. Specific Methods: Cool the containers/tanks with water sprays. Special Protection Equipment: Use self-contained breathing apparatus in confined spaces. 24.4.6 EASURES GAINST... -
Page 72: Ecological Information
24.4.12 E COLOGICAL NFORMATION Effects Linked to Ecotoxicity: Pentafluoroethane (R125). Potential global warming with halo carbides; HGWP (R-11 = 1) = 0.84. Potential impoverishment of the ozone; ODP (R-11 = 1) = 0. 24.4.13 C ONSIDERATION ON ISPOSAL General: Do not dispose of where accumulation can be hazardous. Usable with reconditioning. -
Page 73: Other Information
24.4.16 O THER NFORMATION Recommended uses Refrigerant. Can cause suffocation in high concentration. Keep in a well ventilated place. Do not breathe the gas. The risk of suffocation is often underestimated and must be clearly explained during the training of operators. - Page 74 01276 685405 info@strebel.co.uk www.strebel.co.uk STREBEL LTD RESERVE THE RIGHT TO CHANGE ANY SPECIFICATIONS ON THIS BOILER RANGE WITHOUT NOTICE Further information on our complete product range is available from our website. CAST IRON – CONDENSING – STEEL SHELL – WATER HEATERS – RENEWABLES...
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