BAXI LUNA 310 Fi TECHNICAL INFORMATION

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BAXI LUNA 310 FiTECHNICAL INFORMATION

Baxi Luna Wall-Hung BoilerCommissioning ChecklistPlease attend to each of these items before calling for technical assistanceVenting connected and securePower supply properly polarizedRelay in place and properly wired to thermostatAll isolation valves are openAir has been purged from heating systemNo visible water leaks (drip stains)Pressure gauge stable at 1.5mbarGas pressure settings are correctHot system flush performedUser manual left on siteIt is very important that these steps be carried out in order to have the boileroperate without any additional service required.Baxi N.A.PO Box 4729Utica, NY 13504Tel. 1 844 422 9462Fax. 1 866 432 7329www.baxiboilers.com

Baxi Luna 310fiFeatures & ¾¾¾Gas-fired wall hung combination boilerInput from 126,000 BTUH to 45,000 BTUHOutput from 105,000 BTUH to 35,000 BTUHAutomatically modulates output to meet demand“On Demand” domestic hot water with no storage tankPrioritizes to domestic hot water & does not mix heating water with domestic hotwaterDirect vent, sealed combustionComes complete with 4” concentric vent termination, 90-degree vent elbow & valvekit (pre-swedged to accept ¾” & ½” copper pipe)Reduces mechanical room from 100 sq.ft. to 6 sq. ft. --saving valuable floor spaceCan be mounted in closets or between kitchen cabinetsVirtually silent operationUser friendly control panel, featuring individual heating & DHW controlsEasy service access from front of unit and diagnostic LED’s for easy trouble shootingBuilt-in circulation pumpBuilt-in relief valveBuilt-in pump timer (circulates pump for 5 minutes every 24 hours if system has notoperated)Built-in automatic air ventBuilt-in expansion tankBuilt-in backflow preventerBuilt-in Hi-Limit, frost protection, low water cut-out controlsBuilt-in pressure gauge10-year warranty on heat exchangers; extended parts and labour warranties availableOutdoor reset control optionAttractive leasing programs availableBaxi N.A.PO Box 4729Utica, NY 13504Tel. 1 844 422 9462Fax. 1 866 432 7329www.baxiboilers.com

With the boiler in placeon the wall, measurethe distance from theface of the flue elbowto the outside of thewall (X) fig.3. Transferthis measurement ontothe outside air duct.Take this measurementfrom a spot about ½inch back from theterminal fixing screw.Do this so that if youever need to removethe termination capyou can access thescrews.Mark around the ductand cut off the excessduct.Transferthemeasurement of thewaste piece of ductonto the smaller flueduct fig.4 and cut thisoff.Make sure that the flueduct is not cut short,as this will causeproblemsStandard ventingDuct can be cut with a hacksaw

Coaxial ventingThe coaxial (concentric) venting has a maximum operating length of4mtr. (13.2 ft) in either the horizontal or vertical configuration. Theelbow supplied with the standard horizontal flue is not included in anyequivalent length calculations. Any additional “in line” bends in theflue must be taken into consideration.A 45 bend 0.5 mtr (19.5”). A 90 bend 1.0 mtr. (39.5”)The illustrations above show examples of maximum equivalent ventlengths. Note in the vertical configuration the vent is measured fromthe top of the boiler to the underside of the vertical termination fitting.Coaxial venting is classed as‘0’ clearance to combustibles.

Vent restrictor and clampsThe boiler is supplied with a vent restrictor ring (fig.5) fitted in theflue connection. This is needed if the vent length is less than 1.5 mtr.(5ft). For venting lengths more than 1.5 m., remove and discard.The venting is joined together with clamps. These clamps aresupplied with each piece of vent ducting or fitting. The inner flueduct uses a metal clamp. This clamp is used as is, no sealant isrequired. The outer air duct is used with the silicone gasket seal. Thisgasket allows the air duct to be fitted with a gap between the airducts if in a tight spot; the gap allows the inner clamp to betightened before the outer clamp is tightened.

Two pipe ventingFor venting lengths greater than 4 mtr. (13.2 ft) two separate air ductsare requiredThe maximum vent length for two pipe venting in the horizontalconfiguration is 8 m. (26.3 ft). Any “in line” bends must be takeninto consideration for the equivalent vent length calculation.A 45 bend 0.25 m (10”). A 90 bend 0.5 m (19.5”).IMPORTANT: ensure a minimum downward slope of 1 cm pereach metre of duct length toward the outside (1/4” per each 3ft).The maximum vent length for two pipe venting in the verticalconfiguration is 12 m. (39.3ft). Any “in line” bends must be taken intoconsideration for equivalent vent length calculation.A 45 bend 0.25 m. (10”). A 90 bend 0.5 m. (19.5”).IMPORTANT: if the flue duct exceeds 6 mtrs the condensate collectorkit (supplied as an accessory) must be fitted close to the boiler.2 pipe venting will have to have the flue vent pipeinsulated from combustible materials

Luna 310 control panelThe control panel selector switch (#1) has three positions: center isthe off position; to the right is hot water mode only, and to the leftis the heating and hot water mode. If the switch is turned fully tothe left, this will reset the controls if a fault light is flashing.The reset is spring operated and will return to the normal position.The heating thermostat control (#2) will control the heating closedloop temperature with the T.RISC. in the off position from 30 C(85 F) to 85 C (180 F). With the T.RISC. in the on position theheating closed loop temperature will operate from 30 C (85 F) to45 (110 F).The domestic hot water thermostat (#3) will control the temperatureof the hot water to a maximum of 65 C (149 F). The domestic hotwater temperature at the tap will depend on three factors,1. The set position of the thermostat knob.2. The temperature of the cold water entering the boiler.3. The flow rate of hot water leaving the boiler.The minimum flow of hot water needed to bring the boiler on is 2.5l/m (0.5 gpm). The maximum flow is controlled by the flowregulator to 12.7 l/m (2.8 gpm. Imperial, 3.3 gpm US).

Boiler LED displayThe control panel pressure gauge #4 shows the pressure of theclosed loop heating system. The system pressure must be between1Bar and 1.5 Bar (15 psi and 21 psi). If the pressure falls below 0.5Bar (7.5 PSI), the low water cut off will operate and the boiler willnot fire. If the water pressure in the closed loop has to becontinually topped up, there is a leak in the system, which must befound and repaired.The other symbols and LED lights on the control panel are for theclosed loop temperature display and for troubleshooting. The redLED’s numbers 6-11 have a duel function, they will light up inprogression to show the temperature of the closed loop and remainconstantly illuminated. If a fault develops, the appropriate LED willbegin to flash.LED 12 will be on all of the time the boiler is turned on. LED 13 or14 will light up when there is a call for Hot water (13) or Heating(14), there will only ever be one or the other of these LED’s on,never both at the same time. LED 15 will light and stay on to showthat the burner is alight and operating.The flashing LED’s will indicate the following faults: 6. Flame failure 7. High Limit thermostat operated 8. Fault with the Fan, Air pressure switch or the Venting 9. Fault with the Pump or Low system pressure 10. Faulty Hot Water Sensor 11. Faulty Heating Sensor

Electrical and room thermostatThe BAXI LUNA 3.10 issupplied with a 1-metercord, ready to plug into anearby power outlet.This boiler is polaritysensitive, beforecommissioning the boilerelectrical system checksshould be done.These should be performedwith a suitable meter, andinclude checks for GroundContinuity, Resistance toGround, Short Circuit andPolarity.To connect an externalcontrol to the boiler,remove yellow link wirebetween terminals 1 and 2and connect the cables hereIMPORTANT: The externalcontrol MUST be suitablefor 120V switching. Theoutput from terminal 1and2is 120VLine120VTo gain access to thecontrol PCB, undo thescrews that keep thecontrol panel in place andlower the control panel.On the back left side of thecontrol panel is the PCBcover. Remove the twoscrews holding this cover inplace, push the retainingclips and lift the cover upand toward you. If you arejust checking the 3.15ampfuse do not remove the fullcover, just ‘pop’ the accesspanel on the left.

Electronic PCB jumper settingsOn the electronic PCB, you will find four jumpers, which allow youto make some changes to the operation of the boiler. Thesejumpers have two pins; with the jumper fixed on the two pins(Fig.30), the switch is ‘on’, with the jumper on the left pin only(Fig.29), the switch is ‘off’. When you unpack the boiler from theshipping carton, you will find that the only jumper in the ‘on’position is the T-off jumper. This will allow the burner to re-lightafter a 10 second delay, when operating in the heating mode; werecommend this be moved to the ‘off’ position. This will allow theburner to stay off for 3 minutes, once the boiler thermostat hasturned it off. This will stop the boiler from ‘short cycling’ andcreating low temperatures in the vent during cold weather, thuspreventing the vent from icing up.The T.RISC. jumper in the ‘off’ position allows the boiler to operatefrom 30 C - 85 C (85 F - 180 F). In the ‘on’ position, it will operatefrom 30 C - 45 C (85 F - 110 F). This is for systems requiring lowtemperatures such as radiant floor systems.The GPL jumper will be set by the factory for natural gas orpropane.The POMPA jumper in the ‘off’ position starts and stops the boilerpump when the boiler operates. In the ‘on’ position the boiler pumpwill run continuously when the heating operation is selected.Turn off the power when changing jumper positions

Gas Valve and how to set the gas pressuresThe gas valve has a working inlet pressure of 7”w.c. for natural gas,and 11”w.c. for LP gas. There is a pressure drop through the valve ofapproximately 1”w.c. As the maximum operating gas pressure fornatural gas is 5.6”w.c. and 9.8”w.c. for LP gas, it is important to testthe gas pressure at the inlet test point with the hot water running.The gas valve on the LUNA boiler is a fully electronic modulating gasvalve. That is to say, it will automatically adjust the operating gaspressure to meet the demand on the boiler at that time. When there isa high demand, the gas pressure will go up to high fire to satisfy thatneed. As the temperature of the water in the boiler increases, the gaspressure will automatically reduce to save energy. With conventionalfiring boilers or furnaces, the appliance is either on or off, firing at thepreset heat output of that particular unit. If it is say, a 75,000 BTUfurnace, it will fire at 75,000 BTUs until either the appliance thermostator the room thermostat is satisfied, and then shut off, then fire up at75,000 BTUs again and so on until the end of the heat cycle. Withmodulation, the boiler will start at 75,000 BTUs, but will recognize thatas the system starts to heat it no longer need the same 75,000 BTUs todo the same job, and will start to fire at 70,000 BTUs then 65,000 andthen 60,000 and so on until either of the thermostats are satisfied. Theboiler will modulate in both the heating and the domestic hot watermode. When operating in the domestic hot water mode, the burnermust stay alight to avoid fluctuating hot water from the hot tap,therefore, you must check the high and low gas pressures.

Checking and setting the high and low gas pressureContrary to popular belief, most gas appliances are not factory set.Even if they say they are factory tested, an on-site check will invariablyreveal varying degrees of accuracy.With this in mind, after installing the boiler we strongly recommendthat you set up the gas pressure. There are two gas pressures to set,high fire and low fire. Once these are checked and adjusted ifnecessary, the boiler will then modulate automatically between highand low fire.Set the high fire before the low fire setting.To set the high fire, open anunrestricted hot tap, the boilerwill fire up and go up to highfire. The high fire gas pressuremust be 5.6”w.c.If this is not correct, you willneed to adjust the gas valve inthe following manner.With a 10mm wrench on the gasvalve modulating pin (see foto1); turn the nut clockwise toincrease the gas pressure, orturn it counter clockwise toreduce the gas pressure. If theboiler starts to modulate downbefore you have set the gaspressure, remove one wire fromthe solenoid coil for a short timeto cool the boiler.The low fire gas pressure can onlybe set once the high fire setting iscorrect. The low fire gas pressuremust be 0.7”w.c.After you have checked the highfire, and with the hot tap stillrunning remove one of the wiresfrom the solenoid coil (see foto2); the burner will drop to lowfire. If the low fire gas pressure isnot correct, it can be adjusted byturning the red philips screw inthe center of the modulating pin(see foto 2). Turn the red screwclockwise to increase the gaspressure, or turning counterclockwise will reduce the gaspressure. Reattach the solenoidwire.

Diverter valve assemblyThe 3-port valve and pressure differential valve are located on the left sideof the boiler. This valve diverts the hot water from the primary heatexchanger either to the hydronic-heating loop or to the secondary plateheat exchanger to heat the domestic hot water. The default position of thisvalve is in the heating mode. The valve does not change position until a hottap is opened. The cold water from the main or from a well passes throughthe inlet manifold and operates the DHW differential valve. The valve willmove forward closing the port to the heating loop and opening the port tothe secondary heat exchanger. The output from the boiler is either 100% inthe heating mode or 100% in the DHW mode, never both together.

DHW venturi and flow regulatorPosition ofthe flowregulator andventuriFig.36 shows the flow regulator and venturi assembly. The venturimakes the DHW pressure differential valve operate. Water flowingthrough the inlet manifold passes quicker through the venturi;this lowers the pressure on the front of the DHW diaphragm andincreases the pressure on the back. This allows the diaphragm tomove forward, which in turn allows the 3-port valve to moveforward closing the heating port and opening the DHW port.To remove this assembly, close the cold-water inlet valve underthe boiler and open a hot tap to relive the pressure in theplumbing pipe work. Fig.18 shows the position of the assemblyunder the pump. The assembly can be removed by un-screwingcounterclockwise and lifting out. Check the filter, flow regulatorand venturi for debris, rinsing in clean water as necessary.Reassemble in reverse order.

NTC (Negative Temperature Coefficient) sensors, also known asthermistors. There are two sensors in the LUNA 3.10 Fi boiler. Theprimary flow sensor is located in a dry well, on the outlet pipe from themain heat exchanger. The DHW sensor is located in the outlet manifoldof the secondary heat exchanger, this is in the waterway. Both sensorsare the same part number. A thermistor is a heat sensitive resistor, andshould show a resistance if electrically tested. Although any givenresistance is directly proportional to a corresponding temperature,measurement of resistance at a specific temperature is usually beyondthe scope of the installer. If the primary sensor is replaced, a suitablethermal grease must be used, failure to do so will result in ineffectivetemperature sensing. One fault with an NTC sensor is that it could go‘open circuit’ at high temperature.

Grundfos PumpThe pump used in the Luna 3.10 Fiboiler is the Grundfos UPS high headseries. This pump has been speciallydesigned by Grundfos for BAXI. Thepump body incorporates an automaticair bleeder for venting the air from theboiler. If the boiler is the highest pointin the heating system, the air will ventthrough the AAV. If you have pipe workor equipment above the boiler this AAVwill not vent all of the air from thesystem, a suitable vent must be fitted atthe highest point in the system.Available pump head for the heatingsystem see the graph below.The pump moves the water in the boilerand the heating system through theprimary heat exchanger, and when inthe DHW mode through the secondaryheat exchanger also. Whatever is in theheatingsystempipeworkandequipment will pass through the pump.If the installation, be it new or old hasnot been flushed correctly the debris,oil and flux in the system will damagethe rotor and barings in the pump. Werecommend that the system be flushedbefore opening the shut off valves tothe boiler; this will prevent debris frombeing pushed through the boiler. Thenrun the boiler to maximum temperature,drain and flush again. This will removeany oil and flux remaining in thesystem.

Luna 310 & 1.31 Flushing ProcedureThe procedure for flushing the closed loop is as follows: Connect a hose to the system drain tap Close the boiler heating supply valve (this will allow clean water to be flushedthrough the boiler first) Open the drain tap on the closed loop Open the fill valve on the boiler (the blue handle under the boiler)] When you see clear water coming from the hose, close the fill valve Now open the boiler heating supply valve and close the return valve Open the fill valve on the boiler (this will flush the rest of the system) When you see clear water coming from the hose, close the fill valve Close the drain tap and remove the hose Pressurize the system to the correct pressure on the pressure gauge

BAXI LUNA 310 Fi Troubleshooting GuideBefore getting started, remember Most of the faults experienced on start up are field issues associated with itemsexternal to the boiler. These are mostly simple problems, such as: Venting installed incorrectly Air in the system (system must be fully purged) Air in the gas line Undersized gas line System not flushed (cold flush then hot flush) Incorrect connection of external equipment Leaks in the Heating system and pipe-workAll BAXI LUNA boilers are tested during manufacture for correct operation and areshipped to you factory tested for correct operation. Notwithstanding, whilecommissioning the boiler, a few items need to be checked: Inlet gas pressure (static and working inlet pressure of boiler running atmaximum output) Maximum and minimum burner pressures Power supply for polarity and groundWhen troubleshooting BAXI LUNA boilers, avoid changing parts prematurely do notjump to the conclusion that a boiler component is defective. For example: Parts such as the control PCB are changed incorrectly, when it is anothercomponent supplying false information to it. The pump is sometimes changed unnecessarily because it has stoppedoperating. A pump operational fault is normally the result of contaminationfrom a dirty hydronic system – in which case, the pump can be removed andcleaned (after which the heating system must be flushed and cleaned), and thenreturned to normal operation.Get all the information before going to the job site Get as much information from your customer before you go to the boiler: model ofboiler; type of venting; type of system and layout connected to the boiler; how long hasthe system been installed, and is this an isolated breakdown or are they repeatedlyresetting the boiler? Don’t be afraid to ask the obvious questions! Does yourcustomer know how to reset the boiler? (Just unplugging the lead and replacing it, orturning the boiler off and on again will not reset the logic board.) They have to turnthe switch to “R” to restart the boiler. Is there any water in the system? Where is theneedle on the pressure gauge? This may save an unnecessary trip to the job site.

BAXI LUNA 310 Fi troubleshooting guideFaultCauseBoiler does not startNo power at theno LED's lit.boilerBoiler does

BAXI LUNA 310 Fi TECHNICAL INFORMATION . Baxi Luna Wall-Hung Boiler . User manual left on site It is very important that these steps be carried out in order to have the boiler . The BAXI LUNA 3.10 is supplied with a 1-meter cord, ready to plug into a nearby power outlet.

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