2006 LAND ROVER FRELANDER 2 heater

Publi s hed: 11-May-2011
Auxiliary Climate Control - Electric Booster Heater
Des cript ion and Operat ion
COMPONENT LOCATION
ItemPart NumberDescription1-Heater as sembl y
2-Electric boos ter heater
OVERVIEW
Due t o t he s lower warm up t imes as s oci at ed wi th the di es el engi ne, an elect ric booster heat er may be fit ted t o i ncreas eheat er performance. The el ect ri c boos t er heater does t hi s by heati ng the ai r leaving t he heater as sembl y.
The electric boos ter heater compris es cerami c coat ed t hermis t or el ements and a microcontroll er. A reques t for el ect ri cboos t er heat er operat ion origi nat es in the Aut omati c Temperature Control (ATC) module. Thi s reques t is t rans mi tt ed to theCentral Junct ion Box (CJB) over t he medium speed Controll er Area Network (CAN) bus . The CJB int erpret s t hi s reques t andoutputs a Puls e W idth Modul ati on (PW M) s ignal t o t he electric boos ter heater mi crocont roll er. The durat ion of t he puls esprovided by t he CJB is proport ional t o t he amount of heat ing requi red.
The amount of heat ing reques ted by the ATC i s bas ed on:
Ambient air t emperat ureEngi ne Coolant Temperature (ECT)Heati ng request .

• NOTE: There i s als o a mini mum bl ower motor s peed required el ect ri c boost er heat er operat ion.
The electric boos ter heater is limit ed to 1.25 kW . If electrical load management is i n force, el ect ri c boos t er heaterperformance wil l be reduced.
• NOTE: Vehicles fit ted wit h an electric boos ter heater and heated wi nds hiel d wi ll als o be fit ted wit h an uprat ed 180 ampgenerator.For addit ional informat ion, refer t o: Generator - TD4 2.2L Dies el (414-02 Generat or and Regulat or, Des cript ion andOperat ion).

Publi s hed: 11-May-2011
Auxiliary Climate Control - Fuel Fired Booster Heater
Des cript ion and Operat ion
COMPONENT LOCATION - VEHICLES WITHOUT FFBH REMOTE CONTROL
ItemPart NumberDescription1-Automat ic Temperat ure Cont rol (ATC) modul e
2-Fuel Fi red Boos ter Heater (FFBH)
3-Auxili ary coolant pump4-Ambi ent ai r temperat ure s ens or
5-Auxili ary fuel pump
COMPONENT LOCATION - VEHICLES FROM 2009MY WITH FFBH REMOTE CONTROL

ItemPart NumberDescription
1-Automat ic Temperat ure Cont rol (ATC) modul e2-Fuel Fi red Boos ter Heater (FFBH)
3-Auxili ary coolant pump
4-Ambi ent ai r temperat ure s ens or5-Auxili ary fuel pump
6-FFBH Recei ver
7-FFBH antenna mat chi ng unit
OVERVIEW
The Fuel fired Boos t er Heat er (FFBH) is rated at 5 kW and compensat es for t he rel ativel y low coolant t emperaturesinherent i n the di esel engine. The uni t is locat ed behind t he Right Hand (RH) front fender s plas h s hield and heat s enginecool ant downs tream of t he heat er core.
Operat ion of t he FFBH is controlled by the Aut omati c Temperature Control (ATC) module via the medi um s peed ControllerArea Net work (CAN) bus . Operati on of the FFBH i s influenced by:
Ambient air t emperat ureEngi ne cool ant temperat ure.
The FFBH wil l operate i f the ambient air t emperature is lower than 5 °C (41 °F) and s top if ambient t emperature reaches 8°C (46 °F). Operat ion of t he FFBH may als o be inhibit ed if t he fuel l evel drops below a predet ermi ned level .
Remote Operation - Vehicles from 2009MY
On vehicles from 2009MY the FFBH has remote operati on. The remote sys tem includes t he addi ti on of a FFBH receiver,

The s olenoi d coil of the auxil iary fuel pump i s ins tal led around a hous ing which cont ains a pl unger and pis t on. The pi st onlocates i n a bus h, and a s pri ng is i nst all ed on t he pis ton bet ween the bus h and t he plunger. A fil ter i nsert and a fuel l ineconnector are ins tal led i n the inlet end of t he hous ing. A non return valve and a fuel line connect or are i nst all ed in the fueloutl et end of t he housi ng.
W hi le t he s olenoid coil i s de-energized, the spring holds t he pis t on and plunger i n t he clos ed pos i ti on at the i nlet end oft he hous ing. An O-ri ng s eal on the pl unger provides a fuel ti ght s eal bet ween t he plunger and t he filt er ins ert , prevent ingany fl ow t hrough t he pump. W hen the sol enoi d coi l is energi zed, t he pis ton and pl unger move t owards t he outl et end oft he hous ing, unti l the pl unger cont act s t he bush; fuel i s t hen drawn i n t hrough the i nlet connecti on and fi lt er. The i ni ti almovement of t he pis t on als o clos es t rans verse dril li ngs in t he bus h and is olat es the pumpi ng chamber at t he out let end oft he hous ing. Subsequent movement of t he pis ton then forces fuel from t he pumping chamber through t he non return val veand int o t he li ne to the fuel fi red boost er heat er. W hen the s olenoid de-energizes , the s pri ng moves the pi s ton andplunger back t owards t he cl osed pos it ion. As t he pis t on and plunger move towards t he clos ed posi ti on, fuel fl ows pas t t heplunger and through t he annul ar gaps and t rans vers e holes i n t he bus h t o replenis h the pumping chamber.
FUEL FIRED BOOSTER HEATER (FFBH)
The FFBH is ins tall ed in the coolant s uppl y li ne to the heat er as s embly and i s located behind the RH front fender s plas hs hield. Two el ect ri cal connectors connect the FFBH t o t he vehi cl e wi ri ng.
The FFBH compris es t he fol lowing:
A combus ti on air fanA burner housi ngA heat exchangerAn air i nlet hose and mufflerAn exhaus t pipe and mufflerA control modul e.
Sect ioned View of Typi cal Fuel Fired Boost er Heater

ItemPart NumberDescription
1-Combus t ion ai r fan2-Cool ant out let
3-Cool ant inlet
4-Burner ins ert5-Heat exchanger
6-Temperature s ens or
7-Exhaus t8-Fuel i nl et
9-Evaporat or
10-Air i nl et
Combustion Air Fan
The combus t ion ai r fan regul at es t he fl ow of air i nto t he FFBH t o s upport combus ti on of the fuel suppli ed by t he auxi liaryfuel pump. It i s als o us ed t o purge and cool the FFBH.
Burner Housing
The burner hous ing cont ai ns the burner i nsert and als o i ncorporat es connecti ons for t he exhaus t pipe, the coolant inl etfrom the auxil iary coolant pump and t he cool ant out let t o t he vehi cl e heater.
The burner ins ert i ncorporat es t he fuel combus t ion chamber, an evaporator and a gl ow pin and fl ame s ens or. Fuel from t heauxi li ary fuel pump is s uppl ied t o a vent uri, where it evaporat es and ent ers t he combust ion chamber to mix wit h air fromt he combus ti on air fan. The gl ow pin and fl ame s ens or provides t he igni ti on source for t he fuel:air mi xture and, oncecombus t ion i s es tabli shed, monit ors t he flame.
Heat Exchang er
The heat exchanger t ransfers heat generated by combus ti on t o the coolant . Two s ens ors are i nst all ed in t he heatexchanger cas ing t o provide the control modul e wi th i nput s of Engine Coolant Temperature (ECT). The cont rol module us est he temperat ure inputs t o control s ys tem operati on.
Air Inlet Hose and Muffler
A canis ter t ype muffler i s included in the ai r inlet s upply l ine. The muffler reduces the noi se caus ed by inducti on roar.
Exhaust Pipe and Muffler
The exhaus t pipe and muffl er di rects exhaus t combus ti on gases t o at mos phere below t he front RH wheel arch. Exhaus tvapor may be vi s ible when the FFBH i s running, dependi ng on atmos pheri c condit ions .
Control Module
The cont rol module cont rols and moni tors operati on of the FFBH sys tem. An int ernal flow of ai r from t he combust ion ai r fanvent il ates t he cont rol module to prevent i t overheat ing.

The cont rol module is powered by a permanent feed from the Bat t ery Junct ion Box (BJB), and communi cat es wi th t he ATCmodule over the medium speed Controller Area Network (CAN) bus .
AUXILIARY COOLANT PUMP
The auxi li ary coolant pump is mount ed on t he heater cas i ng and is us ed t o as si s t coolant flow through t he FFBH and t heheat er core.
The auxi li ary coolant pump runs conti nuous ly whi le the FFBH i s act ive. W hen t he FFBH is inact ive, cool ant flow is reli ant ont he engi ne cool ant pump. Operat ion of t he auxi li ary cool ant pump is controll ed by a power feed di rect from t he cont rolmodule wit hi n t he FFBH.
Stop/Start Vehicles - From 2010 MY
Duri ng a St op/Start cycle when the engine i s s hutdown and consequent ly the engine-driven coolant pump is st ati onary, thedesi red s et cabi n t emperature cannot be mai ntai ned for a prol onged period, especially in col d ambient t emperatures . Tocount eract this an auxi li ary electric coolant -pump, cont rol led by t he ECM (engi ne cont rol module), has been i ntegrat ed int ot he cooli ng s yst em t o mai ntai n the coolant flow t hrough t he cabi n’s heater core. This s upporti ng circulat ion prolongs thes et temperat ure set ti ng in the cabin and accordingly prevent s an earl y engi ne res t art .
On vehicles fit ted wit h a Fuel Fi red Boos ter Heat er (FFBH) t he addit ional auxil iary cool ant pump is not ins t al led. In it splace t he FFBH auxi liary cool ant pump is ut il ized t o circulat e t he cool ant i n an engine s hutdown s i tuati on. The pump isact ivat ed via t he FFBH by t he CJB (central junct ion box).For addit ional informat ion, refer t o: Starti ng Sys t em (303-06C Starti ng Syst em - TD4 2.2L Di es el, Vehicles Bui lt From:01-03-2009, Descripti on and Operat ion).
AMBIENT AIR TEMPERATURE SENSOR

12-Fuel fi red boos ter heat er
13-FFBH/DAB ant enna (Vehicles from 2009MY )
14-Fus e 32, BJB15-Fus e FA5, RJB
16-FFBH Remot e hands et (Vehi cl es from 2009MY )
PRINCIPLES OF OPERATION
If a heat ing reques t i s received and t he ambient air t emperature is les s t han or equal to 5°C (41 °F), t he ATC modulet ransmit s a 'supplement al heat' mes s age to the FFBH control modul e over the medi um speed CAN bus . The control modul eres ponds by ret urning a 's uppl ement al heat ' st atus mess age back to the ATC modul e. The control modul e wi ll now i nit iatet he FFBH st art s equence.
If the heati ng reques t is removed, or ambient air t emperat ure ris es t o 8°C (46 °F), the ATC modul e t rans mit s a 'heat er off'mes s age to t he FFBH cont rol module over t he medium s peed CAN bus . Again, t he cont rol module res ponds by returni ng a'heater off' s tat us mes sage back to the ATC modul e. The cont rol module wi ll now de-act ivate the FFBH.
If maxi mum heat ing i s reques ted, Engi ne Cool ant Temperature (ECT) becomes the overriding factor. In t his i nst ance, t heATC module wil l change the CAN bus mes sage from 'heater off' to 's uppl emental heat ' when ECT is bel ow or equal t o 70°C(158°F). If ECT ri ses to 78°C (172°F) t he ATC module returns the mess age t o 'heater off'.
The cont rol module wil l not s t art t he FFBH, or wil l dis cont inue operat ion, if any of the foll owing occur:
The cont rol module is i n t he error l ockout mode (see Diagnostics, below).The engi ne is not runni ng, or s t ops running for approxi mately 4 s econds . The ti me delay i s included for s t alldetecti on.A 'fuel cut -off' mes s age is recei ved from t he CJB over t he medium s peed CAN bus .For addit ional informat ion, refer t o: Air Bag and Safet y Belt Pretens ioner Supplement al Res traint Syst em (SRS)(501-20B Supplement al Res t raint Sys tem, Des cript ion and O perati on).A l ow fuel l evel mes s age is recei ved from t he CJB over t he medium s peed CAN bus (s ee t abl e below).For addit ional informat ion, refer t o: Ins t rument Clus ter (413-01 Inst rument Cl us t er, Des cript ion and Operat ion).
The cont rol module wil l control FFBH operat ion bas ed on t he fol lowi ng levels of fuel i n the tank.
Fuel Level, liters (US Gallons)Description
7.5 (1.98)St art
4.5 (1.18)St op10.5 (2.77)Res tart
Start Sequence
At t he begi nni ng of a s tart s equence, t he FFBH cont rol module;
energizes t he glow pi n and flame s ens or t o pre heat the combust ion chambers tarts t he combust ion ai r fan at s l ow s peedand energizes t he auxi liary cool ant pump.
Aft er approxi matel y 30 s econds , the control modul e energizes t he auxi li ary fuel pump at t he s tarti ng s equence s peed. Thefuel deli vered by the auxil iary fuel pump evaporates i n t he combus t ion chamber, mi xes wi th air from the combus ti on air fanand is ignit ed by t he glow pi n and fl ame s ensor. The cont rol module t hen progres s ively increases t he s peed of the auxil iaryfuel pump and t he combus t ion ai r fan. Once combus ti on is est ablis hed t he cont rol module swi tches t he glow pi n and fl ames ens or t o the fl ame s ens i ng functi on to monit or combus ti on. From t he begi nni ng of the st art s equence t o s tabl ecombus t ion at full load t akes approxi mately 150 seconds .
Full and Part Load Combustion
W hi le t he FFBH is running, the control modul e cycl es the heat er bet ween ful l l oad combus t ion, part load combus ti on and acont rol i dl e phase of operat ion, depending on the temperat ure of t he cool ant in t he heat exchanger.
The heat out put level at part l oad combus t ion i s 2.8 kW . Thi s ris es to 5 kW at full l oad combus ti on. The control modul et ransmit s t he amount of fuel us ed by t he FFBH to the i nst rument clus t er, and t he FFBH coolant t emperature t o t he ATCmodule.
Swit chi ng Point Temperatures