GREENSTAR HEATSLAVE EXTERNAL 12/18, 18/25, 25/32kW FLOOR STANDING EXTERNAL OIL FIRED CONDENSING COMBINATION BOILER USING BALANCED FLUE SYSTEM FOR OPEN VENT AND SEALED CENTRAL HEATING SYSTEMS WITH DOMESTIC MAINS FED HOT WATER THE APPLIANCE IS FOR USE WITH KEROSENE ( 28 SECOND OIL) ONLY GB INSTRUCTION MANUAL INSTALLATION COMMISSIONING & SERVICING
INSTALLATION & SERVICING INSTRUCTIONS SYMBOLS USED IN THIS MANUAL: PLEASE READ THESE INSTRUCTIONS CAREFULLY BEFORE STARTING INSTALLATION. THESE INSTRUCTIONS ARE APPLICABLE TO THE WORCESTER APPLIANCE MODEL(S) STATED ON THE FRONT COVER OF THIS MANUAL ONLY AND MUST NOT BE USED WITH ANY OTHER MAKE OR MODEL OF APPLIANCE. Domestic hot water THE INSTRUCTIONS APPLY IN THE UK ONLY AND MUST BE FOLLOWED EXCEPT FOR ANY STATUTORY OBLIGATION. Central heating THIS APPLIANCE MUST BE INSTALLED BY A COMPETENT PERSON.
SAFETY & REGULATIONS CONTENTS IMPORTANT INFORMATION AND SYMBOLS 1 SAFETY PRECAUTIONS AND INSTALLATION REGULATIONS 3 APPLIANCE INFORMATION SAFETY & REGULATIONS APPLIANCE INFORMATION GENERAL INFORMATION 4 TECHNICAL DATA 5 LAYOUT & COMPONENTS 6 CLEANING PRIMARY SYSTEMS 7 MAINS SUPPLIES 8 9 WATER SYSTEMS & PIPEWORK 10-11 CONDENSATE & PRESSURE RELIEF PIPEWORK 12 BOILER LOCATION & CLEARANCES 13 CABINET MOUNTED LOW LEVEL FLUE TERMINAL POSITIONS 14 HIGH LEVEL FLUE TERMINAL POSITIONS 15 E
SAFETY & REGULATIONS SAFETY PRECAUTIONS INSTALLATION REGULATIONS OIL SMELLS, LEAKS OR FUMES FROM THE APPLIANCE: Extinguish any naked flames. Isolate the electrical supply. Isolate the fuel supply to the boiler. Rectify fault. HEALTH & SAFETY: The appliance contains no asbestos and no substances have been used in the construction process that contravene the COSHH Regulations (Control of Substances Hazardous to Health Regulations 1988).
GENERAL INFORMATION STANDARD PACKAGE: 770mm 640mm A A - Floor standing oil fired condensing boiler for open vent and sealed domestic central heating and mains fed hot water. B - Literature pack. D - 100mmØ services duct. E - Cabinet key 950mm APPLIANCE INFORMATION C - Condensate trap kit. B C D E Check List Item Qty Greenstar Heatslave External Installation/Servicing Instructions........1 Users Instructions ........................................................................................
TECHNICAL DATA DESCRIPTION UNITS 12/18 18/25 25/32 Central Heating APPLIANCE INFORMATION Primary water capacity (total) litres 69 69 72 Maximum static head metres 30 30 30 Minimum static head metres 1 1 1 metres water 4.7 4.0 4.2 bar 2.5 2.5 2.5 colour Lime — — litres/min 15 18 22 Minimum inlet pressure (dynamic) for optimum flow rate bar 1.5 1.2 0.
LAYOUT & COMPONENTS The diagram opposite excludes the top, front and RH side casing panels. 44 43 i) 44 iii) ii) 43 i) 42b v) ii) iii) iv) 13 v) 42a 18 14 12 10 15 11 16 8 9 4 5 6 17 7 19 3 1 41 40 2 39 38 37 35/36 34 33 32 20 21 31 30 26 29 25 24 23 22 27 28 CONTROL BOX ASSEMBLY DIVERTER VALVE PRESSURE GAUGE AUTO AIR VENT CH CONTROL AND MANUAL RESET OVERHEAT THERMOSTAT PHIAL 6. CASING SIDE PANEL 7. CIRCULATING PUMP 8. AUTO-RESET HIGH LIMIT THERMOSTAT PHIAL 9.
CLEANING PRIMARY SYSTEMS IMPORTANT: All the following Pre-Installation sections must be read and requirements met before starting boiler or flue installation. CAUTION: ISOLATE THE MAINS SUPPLIES BEFORE STARTING ANY WORK AND OBSERVE ALL RELEVANT SAFETY PRECAUTIONS. IMPORTANT: Debris from the system can damage the boiler and reduce efficiency. Failure to comply with the guidelines for t he use of wat er treatment with the appliance will invalidate the appliance warranty.
IMPORTANT: The appliance provides a permanent external electrical supply for servicing and must therefore be fed via a circuit breaker incorporating earth leakage protection. MAINS SUPPLIES ELECTRIC SUPPLY: • Supply: 230V - 50Hz. • Cable: PVC insulated 0.75mm2 (24 x 0.2mm) temperature rated to 90°C. • Protection IP45. • External 5A fuse to BS 1362. • The appliance must be earthed. • Please refer to IEE regulations for cross bonding requirements.
A B C D E F G H J K L M N - Oil storage tank - Isolating valve - Oil strainer & water seperator - Fire valve to BS5410 - External casing - Fire valve sensor - Oil burner OIL SUPPLY - Oil supply pipe - Oil pump - Full base (plastic tanks) - Non-return valve - De-aerator - Oil filter (16µm max filtration size) This appliance is suitable for kerosene (28 second oil) only, no other fuel must be used. OIL SUPPLY: • Plastic or steel tanks should be installed to BS 5410.
WATER SYSTEMS & PIPEWORK IMPORTANT: The boiler should not be allowed t o operat e wit h a ret urn temperature of less than 40°C when the system is up to operating temperature. PRIMARY SYSTEM PLASTIC PIPEWORK: • Plastic pipework used for underfloor heating must be correctly controlled with a thermostatic blending valve limiting the temperature of the circuits to approx. 50°C with 1000mm (minimum) length of copper or steel pipe connected to the boiler. TYPICAL OPEN VENT SYSTEM 1000mm min.
WATER SYSTEMS & PIPEWORK Water main supply Heating return Hose return Non return Non return valve valve Stop cock Temporary hose Test cock Stop cock FILLING PRIMARY SEALED SYSTEMS: • Filling the system must comply with one of the methods shown opposite. • The filling point must be at low level and must never be a permanent direct fixing to the mains water supply. • Filling loops must be WRAS approved.
CONDENSATE & PRESSURE RELIEF PIPEWORK a C CONDENSATE PIPEWORK: A D 75mm min. b • The condensate pipework must fall at least 50mm per metre towards the outlet and should take the shortest practicable route and not exceed 3 metres outside the building. If a run greater than 3m is required, 32mmØ polypropylene pipe must be used. c C E C A • All national and, where appropriate, local regulations for the discharge and neutralisation of condensate should be followed.
BOILER LOCATION & CLEARANCES 600mm WARNING: This appliance should not be installed where there is a potential for excessive ground water coverage. 2500mm* FRONT 600mm This boiler is only suitable for installing externally at a suitable location onto a fixed permanent rigid surface c apable of supporting the boiler weight. There must be a sufficient hard standing around the appliance to allow for servicing.
CABINET MOUNTED LOW LEVEL Minimum dimensions of flue terminal positions for oil fired appliances: FLUE TERMINAL POSITIONS TERMINAL POSITION B(H) • Flue terminals must be positioned to avoid combustion products entering into buildings.
Minimum dimensions of flue terminal positions for oil fired appliances: TERMINAL POSITION B(V) POSITIONS A1 2 Directly below an opening, air brick, opening window, etc 600mm N/A B1 2 Horizontally to an opening, air brick, opening window, etc 600mm N/A 75mm N/A Below a plastic/painted gutter, drainage pipe or eaves without protection to combustible material 600mm N/A E From vertical sanitary pipework 300mm N/A F From an external or internal corner or from a surface or boundry alongside t
BALANCED EXTERNAL OILFIT L = 2000mm FLUE OPTIONS IMPORTANT: The weather seal (supplied) must be fitted to every flue joint to give the required level of weather protection. L F * B The diagrams (opposite) show the components used and the maximum flue length (L) for each flue configuration. 125mmØ x2 ** High level horizontal terminal (rear outlet) In all cases L is measured from the outside of the boiler casing.
CABINET MOUNTED BALANCED HORIZONTAL FLUE OPTIONS • The horizontal flue is fitted to the rear or either side of the cabinet. REAR FLUE OUTLET A+C IMPORTANT: It is strongly recommended that the flue terminal faces away from walls to minimise the occurance of wetting. PRE INSTALLATION Plan view FRONT A - External horizontal flue kit Part No. 7 716 190 052 LEFT HAND FLUE OUTLET A+B+C B - 90° inline elbow 80/125mm Part No. 7 716 190 034 Plan view C - Terminal guard Part No.
IIMPORTANT: All the previous Pre-Installation sections must be read and requirements met before starting boiler or flue installation. UNPACKING THE BOILER LIFTING AND CARRYING PRECAUTIONS: • Lift only a manageable weight, or ask for help. 1 • When lifting or putting things down, bend the knees, and keep the back straight and feet apart. • Do not lift and twist at the same time. • Lift and carry objects close to the body. • Wear protective clothing and gloves to protect from any sharp edges.
All dimensions in mm 256 374 PIPEWORK & FLUE POSITIONS Flue CAUTION: Ensure there are no pipes, electric cables, damp proof courses or other hazards before drilling. 171 Services 58 SAFETY: All relevant safety precautions must be undertaken. Protective clothing, footwear, gloves and safety goggles must be worn as appropriate.
WARNING: THIS APPLIANCE IS SERVICED AND REPAIRED EXTERNALLY. BOILER INSTALLATION EXTERNAL EQUIPMENT OPERATED AT 230V SHOULD NOT BE INSTALLED, SERVICED OR REPAIRED UNDER ADVERSE WEATHER CONDITIONS. THIS APPLIANCE IS INSTALLED AND SERVICED EXTERNALLY TO THE PROPERTY, BUT THE ENGINEER MUST HAVE ACCESS TO THE INSIDE OF THE PROPERTY WHEN INSTALLING OR SERVICING THE APPLIANCE. Note: The cabinet is not load bearing it only provides weather protection for the boiler inside.
FLUE INSTALLATION INSTALLATION NOTES: Ensure all the seals are in good condition and seated properly. To ease assembly of flue components, grease seals lightly with the solvent free grease supplied. A terminal guard must be fitted if the terminal is 2m or less above a surface where people have access. INSTALLATION All flue options: 1 Lightly grease the flue cowl seal with the solvent free grease supplied.
COMBUSTION CHAMBER F E Combustion chamber: 1 Release retaining nuts and washers (B). Remove combustion chamber access door (A). 4 2 Ensure the baffles (C) and baffle retainer (D) are correctly fitted for the boiler output as shown in the plan views opposite. A 3 Refit combustion chamber door (A). Secure with nuts and washers (B) and tighten until the door is firmly secured, do not over tighten the nuts. B 4 Unscrew screws (E) and remove flue manifold access cover (F).
CAUTION: ISOLATE THE OIL & WATER MAINS SUPPLY BEFORE STARTING ANY WORK AND OBSERVE ALL RELEVANT SAFETY PRECAUTIONS.
PIPEWORK CONNECTIONS - Flue manifold condensate outlet Condensate outlet (21.5mmØ) - supplied Condensate pipe - not supplied Condensate trap with clamp - supplied Pressure relief (15mmØ) CONDENSATE CONNECTION: The condensate trap (L) must be installed onto the bracket supplied. Measure condensate pipe (J) mark and cut square to length required. Fit sealing washer inside condensate pipe nut and connect to the flue manifold outlet (H). Connect 21.
OIL BURNER & PUMP 12/18 & 18/25 kW 1 Electrode gap 2.5 - 3.0mm CAUTION: ISOLATE THE OIL & WATER MAINS SUPPLY BEFORE STARTING ANY W OR K AN D OB S E RVE ALL R E LE VANT SAFETY PRECAUTIONS. OIL BURNER: B 1 Check the nozzle (A) and electrode (B) settings are correct for the relevant burner as shown opposite. A 5mm Ensure nozzle (A) is aligned centrally within the combustion head (C). 5mm Inspect for any visible defects. C 7.
REFITTING COMPONENTS 1 Align burner combustion head (A) into boiler housing tube with gasket (B) correctly fitted. Push firmly down to compress the gasket (B). Tighten burner retainers (C) sufficiently to ensure a good seal. IMPORTANT: Ensure the gasket is a good seal between the burner combustion head and the boiler housing to prevent flue gases escaping from the combustion chamber into the cabinet. B A C Attach the flexible air duct and tighten clamp(D) to secure to the burner air intake.
ELECTRICS B 1 DANGER - 230V: ISOLATE THE MAINS ELECTRICITY SUPPLY BEFORE STARTING ANY WORK AND OBSERVE ALL RELEVANT SAFETY PRECAUTIONS. C B IMPORTANT: THIS APPLIANCE PROVIDES A PERMENANT EXTERNAL ELECTRICAL SUPPLY FOR SERVICING AND MUST THEREFORE BE FED VIA A CIRCUIT BREAKER INCORPORATING EARTH LEAKAGE PROTECTION. 230V MAINS SUPPLY IMPORTANT: OBSERVE ELECTRONIC STATIC DISCHARGE PRECAUTIONS. DO NOT TOUCH THE PCB CIRCUITS.
ELECTRICS Electrical components: 1 Printed circuit board 2 Thermostat - boiler high limit 3 Thermostat - DHW control 4 Thermostat - CH control 5 Indicator lamp - boiler mode 6 Indicator lamp - lock-out 7 Manual reset - overheat thermostat 8 Manual reset - flue overheat thermostat 9 Manual reset - burner lock-out 10 External programmer (not supplied) 11 Burner socket 12 Burner plug 13 Burner control box (12/18 & 18/25 shown) 14 Flow switch 15 Circulating pump 16 Diverter valve 17 Frost stat 18 Frost stat 1
PRE-COMMISSIONING CHECKS APPLIANCE 1 CAUTION: ISOLATE THE MAINS SUPPLIES BEFORE STARTING ANY WORK AND OBSERVE ALL RELEVANT SAFETY PRECAUTIONS. 3 1 Check that the service and water pipes are connected correctly. 2 Check that all unused sockets are capped. 2 Check that the oil supply is kerosene and that the pipework is connected correctly to the oil pump via the supplied flexible oil hose. Turn on the main oil supply valve at the tank, check the oil supply pipework and connections.
FILLING THE SYSTEM 1 B 1 Pull lever (C) up and push to the left to move the diverter valve to the mid-position between ports A and B. A C Push and hold lever (C) down to lock. 2 Loosen the automatic air vent cover. 4 Sealed systems only; check and if required, adjust the expansion vessel pressure using the Schraeder type valve (D). 2 The charge pressure of the built-in 12 Litre expansion vessel is 0.5 bar as dispatched, which is equivalent to a static head of 5 metres (16.7 ft).
STARTING THE APPLIANCE IMPORTANT: Never run the appliance when the appliance/system is unpressurised (sealed systems) or empty. 1 1 Check the oil supply is correctly fitted and in good working order before turning on the oil supply valves to the boiler.
2 STARTING THE APPLIANCE E D 25/32 (on top of burner control box) D 12/18 & 18/25 (under control box) 4 3 K DANFOSS SUNTEC RIELLO BFP 11 L3 OIL PUMP AS47C OIL PUMP RDB OIL PUMP A If after-spurting occurs: Release the burner retainers. Remove the burner, combustion head (F). and electrodes, hold the burner vertical to unscrew the nozzle and fill the nozzle holder with oil. Refit nozzle, electrodes, combustion head (F) and the burner.
STARTING THE APPLIANCE Domestic hot water: 1 Set the CH/DHW programmer to OFF. Fully open a hot water tap. 1 The burner should be OFF and the circulating pump ON. 2 on max service max lockout flue reset boiler reset GREENSTAR HEATSLAVE EXTERNAL C 3 Fully open a hot water tap. The burner should be ON with the circulating pump.
STARTING THE APPLIANCE 1 on max service max lockout flue reset C boiler reset GREENSTAR HEATSLAVE EXTERNAL Central heating: 1 Open all radiator valves. Set room thermostat to maximum. Set programmer to ON for CH. Turn the DHW thermostat control (C) fully anti-clockwise. Turn the CH thermostat control (D) to max. The burner should be ON with the circulating pump. The diverter valve (E) should open to port B for CH.
WATER TREATMENT IMPORTANT: Debris from the system can damage the boiler and reduce efficiency. Failure to comply with the guidelines for the use of water treatment with the appliance will invalidate the appliance warranty. 1 FLUSHING (Central Heating): 1 Switch off the boiler. Open vented systems only: turn off the water to the system header tank. Open all radiator valves/drain cocks (C) and drain the system while the appliance is hot. Close drain cocks (C).
FINISHING COMMISSIONING APPLIANCE 1 Refit the top panel and press down to compress the seal when fitting the securing screws (A). 2 Push the front panel up behind the top panel and push in at the base to secure the screws (B) with the tool provided. A A Always apply pressure at the edges of the panels when securing to avoid accidental damage. 1 2 COMMISSIONING C B B K Handover: Complete the guarantee registration card, combustion record (page 49) and a CD11 or an equivalent commissioning form.
INSPECTION AND SERVICE CAUTION: ISOLATE THE WATER, ELECTRICITY AND OIL MAINS SUPPLIES BEFORE STARTING ANY WORK AND OBSERVE ALL RELEVANT SAFETY PRECAUTIONS. on DO NOT USE PRESSURE WASHERS OR STEAM CLEANERS ON THIS APPLIANCE OR ITS CABINET.
INSPECTION AND SERVICE 1 Clean the Burner: 12/18 & 18/25 P Remove the air intake cover (H) and clear any debris from the air intake and air damper. Disassemble the burner to allow access to the fan impeller. Check the condition of the gaskets between these parts and replace if necessary. Note the position of the air damper adjustment and check the air damper moves freely. Clean both sides of the fan impeller and remove any debris from the burner housing. Check that the impeller rotates freely.
INSPECTION AND SERVICE External oil filter: Remove the paper element from the external oil filter and replace it. If the filter contains a washable element, thoroughly clean in kerosene and reassemble into the filter. Clean the boiler: Manifold access: E F J H K G or J H G A SERVICING & SPARES B Plan sectional view Plan sectional view 25/32kW 12/18kW & 18/25kW C C Remove top cover by releasing the screws at each corner and lift free.
INSPECTION AND SERVICE B A C Re-commission the burner: 1 Align burner combustion head (A) into the boiler housing tube with gasket (B) correctly fitted. Push firmly down to compress the gasket (B). Tighten burner retainers (C) sufficiently to ensure a good seal. D IMPORTANT: Ensure the gasket is a good seal between the burner combustion head and the boiler housing to prevent flue gases escaping. Refit flexible air duct and secure with clip (D). 2 Plug burner lead (E) into control box (F).
SHORT PARTS LIST 12/18 1 2 1 Burner - Sterling 40 Part Number: 8 716 112 507 0 2 Combustion head - burner Part Number: 8 716 112 604 0 3 Control box Satronic DKO 970 Part Number: 8 716 142 396 0 4 Photocell Satronic MZ770s 3 4 5 6 Part Number: 8 716 156 692 0 5 Control box base Satronic S98 12 pole Part Number: 8 716 142 782 0 6 Ignition electrode Part Number: 8 716 156 683 0 7 Motor Part Number: 8 716 156 645 0 8 Oil pump - Danfoss BFP 11 L3 7 8 8a 9 Part Number: 8 716 142 736 0 8a Oil pump - Su
SHORT PARTS LIST 18/25 1 2 1 Burner - Sterling 50 Part Number: 8 716 112 570 0 2 Combustion head - burner Part Number: 8 716 108 573 0 3 Control box Satronic DKO 970 Part Number: 8 716 142 396 0 4 Photocell Satronic MZ770s 3 4 5 6 Part Number: 8 716 156 692 0 5 Control box base Satronic S98 12 pole Part Number: 8 716 142 782 0 6 Ignition electrode Part Number: 8 716 156 683 0 7 Motor Part Number: 8 716 156 645 0 8 Oil pump - Danfoss BFP 11 L3 7 8 8a 9 Part Number: 8 716 142 736 0 8a Oil pump - Su
SHORT PARTS LIST 25/32 3 2 1 4 1 Burner - Riello RDB 2.
PROBLEM CAUSE REMEDY Combustion settings incorrect Set up as in installation instructions Faulty nozzle Replace nozzle FAULT FINDING LOCKOUT: Pulsation on start Intermittent lockout Bad electrical connection Check control box/electrical connections Intermittent flame detection fault See flame detection fault Faulty motor or electrical supply to motor Check for 230v at motor plug during startup period Control box fault Replace control box Flame detection Photocell filmed over (dirty) Wipe
PROBLEM CAUSE REMEDY Pump noise from air in pump or worn pump Bleed air from pump or replace pump Worn motor bearings Replace motor Fan out of balance Replace fan FAULT FINDING FAULTY BOILER OPERATION: Noisy operation Boiling Short Cycling Replace if necessary Short circuit boiler thermostat Take out of circuit to check Thermostat bulb not fully home in pocket Ensure bulb is pushed fully home No primary water circulation Check system / circulating pump Burner rating incorrect Correct bu
Yes Motor 40Ω No Check boiler controls & supply INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32 8 716 106 252b (07/06 No No Yes No No Replace motor Check connections/ replace leads Replace motor/ pump Replace control box Yes Lockout within 1 second? Replace pump No Replace oil pump Yes Oil to pump? No Drive coupling broken? No Pump produces pressure? Yes Replace transformer Yes Electrodes & leads OK? Yes 230V at transformer? No
FAULT FINDING 47 INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32 8 716 113 389b (09/07) Replace photo cell Replace control box Yes No No Yes Yes Unblock or replace pipe No Replace control box Replace solenoid coil Replace motor Replace oil pump Yes Oil to pump? No Drive coupling broken? No Purge pressure 1-2 bar? No Pump produces pressure? Yes Yes Replace solenoid coil No (100Ω)? Solenoid coil Yes functional No Solenoid operatin
MODE SWITCH SERVICE CONNECTION L N MAINS CONNECTION INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32 8 716 106 252b (07/06 X1 (PIN 3) ELECTRICAL SCHEMATIC C1 X4 (PIN 3) brown X2 (FS) N N DHW CH LINK (REMOVE) N ROOM THERMOSTAT X2 (LS) X2 (NS) X2 (LR) 3 2 1 4 N RELAY 1 grey X8 (PIN 2) 3 2 white X10 (PIN 1) 1 3 4 blue X6 (PIN 4) WATER FLOW SWITCH brown X6 (PIN 2) grey R1 C1 N X13 (PIN 5) RELAY 4 X13 (PIN 2) 4 4 2 X
OIL BOILER COMBUSTION RECORD BOILER MODEL COMMISSIONING ENGINEER SERIAL No. COMBUSTION CHECKS COMPANY NAME: PUMP PRESSURE (PSI): ADDRESS: CO2 %: SMOKE READING: ENGINEERS NAME: SIGNATURE: F.G.
SERVICE 1 DATE SERVICE 2 DATE ENGINEER NAME COMPANY NAME TEL No. OFTEC REG No. PUMP PRESSURE: NOZZLE CHANGED? F.G.T. °C COMMENTS ENGINEER NAME COMPANY NAME TEL No. OFTEC REG No. PUMP PRESSURE: NOZZLE CHANGED? F.G.T. °C COMMENTS psi CO2%: YES NO FLUE PRESSURE: SIGNATURE SIGNATURE SERVICE 3 DATE SERVICE 4 DATE ENGINEER NAME COMPANY NAME TEL No. OFTEC REG No. PUMP PRESSURE: NOZZLE CHANGED? F.G.T. °C COMMENTS ENGINEER NAME COMPANY NAME TEL No. OFTEC REG No. PUMP PRESSURE: NOZZLE CHANGED? F.G.T.
In the unlikely event the boiler does not give complete satisfaction, before calling for a service engineer, the installer should check the following:General checks 1. Is the mode switch in boiler mode (indicator on)? 2. Is there 230V across the boiler live and neutral terminals? 3. Is the polarity correct? (230V across live and earth, 0V across neutral and earth) 4. Is the air bled from the primary system? 5. Is the air bled from the oil supply? 6.