Finned copper tube gas boilers & water heaters – Boiler Manual
Finned copper tube gas boilers & water heaters – Boiler Manual
33
F
T rouble s hoo t ing A S t ar t u p
A c t i o n
C he c k
I den t i f y S ou r c e
S y m p t o m
A n I n t e r l o ck i s t r i pped .
P r o c eed t o HeatNet
M anua l
Control
f o r
m o r e
de t a il s
an d
p r ob l e m
r e s o l u t i on .
1 .
1 . I s i t a 24 V A C I n t e r l o ck ?
2 . I s i t a 120 V A C I n t e r l o ck /
A l a r m ?
3 . I n t e r na l A l a r m s
1 . A ll 24 V A C I n t e r l o cks a r e
l o c a t ed on J 1 1 A and J 1 1 B .
E x a m p l e s o f 24 V A C I n t e r l o cks :
1 .S P A R E 3
2 . V a r i ab l e F r equen c y Dr i v e ( V F D )
3 . Lo w W a t e r C u t o f f ( L W C O ) ,
4 . G a s P r e ss u r e
5 . S pa r e 4
6 . O pe r a t o r O P L I M
7 . W a t e r Fl o w
8 . A i r P r e ss u r e f r o m U V S en s o r .
2 . A ll 120 V A C i n t e r l o cks /A l a r m s
a r e l o c a t ed on J 5 . T he s e i n c l ude :
1 . F L A M E SA F E A L A R M ( I gn i t i o n
CTRL ALARM)
2 . V alve Alarm (IRI ALARM)
3 .
XS_FACTORY
(Reserved)
4 . H I G H L I M I T
1 . O PE N SE N S OR
2 . S H O R T E D SE N S OR
3 . C O M B U S T I O N AI R D A M PE R
1 . U s e a m u l t i m e t e r and c he c k
f o r 24 V A C on J 1 1 A, J 1 1 B t o
i den t i f y w h i c h i n t e r l o ck ha s
t r i pped . R e s e t t he I n t e r l o ck o r
c he ck f o r d i sc onne c t ed w i r i n g
o r s ho r t s .
T he A i r P r e ss u r e f r o m U V
S en s o r i n t e r l o ck i f d i s p l a y e d
w ill a ll o w t he bo il e r t o
f un c t i on , bu t i t need s t o b e
f un c t i ona l w h il e t he bo il e r i s
r unn i ng f o r i t t o c l ea r .
1 . U s e a m u l t i m e t e r on J 5 t o
t o c he ck f o r 120 V A C o n
t he s e i n t e r l o cks ( e x c ep t t h e
H I G H L I M I T ) . T he H i gh L i m i t
I n t e r l o ck i s d i s p l a y ed w he n
t he r e i s no 120 V A C , s i n c e
t he H I G H L I M I T b r ea ks t h e
120 V A C t o t he I gn i t i o n
C on t r o l .
N O T E: St r a y V o l t age s
G r ea t e r t han 8 V A C and l e s s
t han 18 V A C on t he s e
i n t e r l o cks c an c au s e
i n t e r m i tt an t ope r a t i on . If t h i s
i s t he c a s e , c he ck f o r ba c k
f ed v o l t age s f r o m f i e l d
w i r i ng .
C he ck s en s o r v o l t age s a t
J 10 A and J 10 B. T h e
T e m pe r a t u r e s en s o r i npu t s
s hou l d be be t w een 0 V D C
and 5 V DC m ea s u r ed a c r o s s
t he s en s o r . E x a m p l e : At 77
°F,
t he v o l t age w ou l d r ead 2 . 5
V DC .
T he c o m bu s t i on a i r da m pe r
p r o v e s w i t c h m u s t be w i r e d
a c r o ss S P A R E 1 and m u s t b e
a " DR Y " c on t a c t. D o no t
app l y a v o l t age t o t h i s i npu t ,
t he i npu t s upp li e s i t ' s o w n
v o l t age / c u rr en t .
2 .
