Heatrae Sadia Megaflo solar Installation Manua page 31

Table 2 - Fault Finding Chart
F A U L T
N o hot w ater ow
W at er from hot t aps is
c old
W at er dis c harges
from E x pans ion R elief
V alve
W at er dis c harges from
T& P R elief V alve
P O S S IB L E C A U S E
1. M ains s upply o
2. S t rainer bloc k ed
3. C old W at er C om bination
V alve inc orrec t ly tt ed
1. D IR E C T im m ers ion
heater not s w it c hed on
2. D IR E C T im m ers ion
heater t herm al c ut -out has
operat ed
3. IN D IR E C T program m er
s et to C ent ral H eating only
4. IN D IR E C T boiler not
w ork ing
5. IN D IR E C T therm al c ut -
out has operated
6. IN D IR E C T m ot oris ed
valve not c onnec t ed
c orrec tly
7. S O LA R ins u c ient s olar
gain w it h no aux iliary
heating s w it c hed on
1. IN TE R M ITTE N TLY
E x pans ion volum e has
reduc ed w ithin E x pans ion
V es s el
2. C O N TIN U A LLY
a. C old W at er C om bination
V alve P res s ure R educ er not
w ork ing c orrec tly
b. E x pans ion V alve s eat
dam aged.
1. Therm al c ontrol failure
N O TE w ater w ill be very hot
R E M E D Y
1. C hec k and open s t op c oc k
2. Turn o w at er s upply .
R em ove s t rainer and c lean (s ee
S ec tion 9. 3)
3. C hec k and re t as required
1. C hec k and s w it c h on
2. C hec k . R es et by pus hing
but ton. (S ee D iagram 11)
3. C hec k . S et t o a D om es tic
H ot W ater program m e
4. C hec k boiler operation. If fault
is s us pec t ed c ons ult boiler
m anufac t urer's ins t ruc t ions
5. C hec k . R es et by pus hing
but ton on c ut-out. C hec k
operation of indirec t therm os t at
(s ee D iagram 13)
6. C hec k w iring and/ or plum bing
c onnec t ions to m ot oris ed valve
(s ee D iagram s 14 & 15)
7. C hec k aux iliary heat s ourc e
is s w it c hed on and is c ont rolled
t o provide heat gain if no s olar
out put is available.
1. S ee S ec tion 9. 6 for re-
c harging proc edure
a. C hec k pres s ure from C old
W at er C om binat ion V alve. If
greater than 3 bar replac e
P res s ure R educ er c art ridge
b. R em ove E x pans ion V alve
c artridge. C hec k c ondition of
s eat . If nec es s ary t new
E x pans ion V alve c art ridge.
1. S w it c h o pow er t o
im m ers ion heat er(s ), s hut dow n
boiler and s olar prim ary c irc uit .
D O N O T turn o w at er s upply .
W hen dis c harge s t ops c hec k
all therm al c ont rols , replac e if
fault y .
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