Bailey Unicorn - Draining Freshwater; Heat Transfer Fluid; Filling

64
HEATINGSYSTEMS
Draining Freshwater
1. Switchoffthewaterpump.
2.Openallwatertaps,showers,etc.
3.Open the safety/drain valve by lifting the
yellow tab (Fig.1 [M]): see page 62, or by
turningtheblueknob(Fig1.[K])90°.
4.The system will drain directly below the
vehiclethroughtheclearplastichoseonthe
safety/drain valve. Check that all water has
emptied out (7–10 litres). Leave the valve in
theopenpositionuntilthenexttimethehot
watercylinderisused.
NB: Check that the red breather valve (Fig.1
[N]) is allowing air to enter the hot water
cylinder,whenitisbeingdrained,andthatthe
clearplastichoseisnotobstructed.
Fig.1
Heat Transfer Fluid
Thecentralheatingsystemislledwith
heattransferuid(HTF),asolutionof50%
ethyleneglycolantifreezeand50%water.
!
Theboilermustnotbeswitchedonif
thereisnoHTFinthesystem.
The antifreeze manufacturer will
have a maximum water hardness
recommendation. Read the product
label or contact the product
manufacturerfordetails.
Alde recommends antifreeze meeting VAG
G12++ or G13 specication, and deionised
water(0ppm).
50:50 ethylene glycol antifreeze and water
willprotectagainstfrostdownto-35to37°C.
A refractometer and/or hydrometer can be
usedtomeasurethestrengthoftheantifreeze
solution.
Corrosion protection will vary depending on
thelifespanoftheantifreeze.Readtheproduct
labelorcontacttheproductmanufacturerfor
details.
!
AlwaysreplacetheHTFinaccordance
withtheantifreezeproduct’slifespan.
Ifinanydoubt,replacetheHTFafter
2years.
The corrosion inhibitors found in ethylene
glycolantifreezemaynotbecross-compatible.
WhentoppinguporreplacingtheHTF,ensure
the new antifreeze is compatible with the
currentantifreezeproduct.Readtheproduct
labelorcontacttheproductmanufacturerfor
details.
i
Asaroughguideline,blueandred
antifreezeproductsarenot
compatiblewitheachother,butVAG
G12++andG13specantifreeze
(purple/magenta)iscompatiblewith
both.
Failuretollwith suitableHTF mayresultin
severedamagetoyourAldesystem,whichis
notcoveredunderwarranty.
Filling
ThecentralheatingsystemislledwithHTF
throughtheexpansiontank,eitherbyhand,or
usingthe Alde servicepump.Anycontainers
used for handling or storing the HTF should
be checked rst, and must be visibly clean
toavoidintroducing contaminantsor foreign