T M 1 0 - 4 5 1 0 - 2 0 6 - 14
TO 4OP1-6-2-1
CONTROLS AND INDICATORS
Key
C o n t r o l o r I n d i c a t o r
Function
1
H o t W a t e r O u t p u t V a l ve
2
Water temperature Gage
3
H i g h L i m i t C o n t r o l
4
Operating Control
Calibrated for water temperature from 0 to
2 5 0 ° F ( - 1 6 t o 1 2 1 ° C ) . C o n t r o l s w a t e r h e a t er
burner to maintain water temperature between
160 and 210°F (71 and 99°C) .
5
Load Limit Switch
C o n t r o l s a l l e l e c t r i c a l p o w e r t o t h e w a t er
h e a t e r . Before PBU100442, provides overload
p r o t e c t i o n t o p r o t e c t m o t o r , i g n i t i o n
t r a n s f o r m e r,
a n d e l e c t r i c a l c o n t r o l s .
6
Fuel Pressure Gage
7
Fuel Shut Off Valve
8
Blower Shutter
9
Combustion Chamber
Enables operator to visually check combustion
Sight Glass
Sight Glass in combustion chamber.
Controls hot water output from the water
h e a t e r t o t h e m i x i n g v a l v e.
I n d i c a t e s t e m p e r a t u r e o f w a t e r i n s i d e w a t er
h e a t e r.
Preset at the factory. Operates when operating
c o n t r o l ( 4 ) f a i l s . D e a c t i v a t e s f u e l s o l e n o id
valve when water temperature exceeds 190°F
( 8 8 ' C ) t u r n i n g o f f f u e l t o t h e w a t e r h e a t e r.
I n d i c a t e s p r e s s u r e o f f u e l s u p p l i e d t o t he
b u r n e r.
(Normal indication is 100 psi 690kPa).
C o n t r o l s f u e l f l o w t o b u r n e r . 1 . C l o c k w i s e
r o t a t i o n c l o s e s v a l v e . 2 . C o u n t e r c l o c k w i s e
r o t a t i o n o p e n s v a l v e ,
C o n t r o l s a m o u n t o f a i r t o b u r n e r . 1 . T u r n e d
downward increases air to burner. 2. Turner
upward decreases air to burner.
10
Burner Assembly Sight
E n a b l e s o p e r a t o r t o v i s u a l l y c h e c k e l e c t r o d es
Glass
s p a r k g a p t o s e e i f t h e y a r e f i r i n g.
11
Motor Contactor
O v e r c u r r e n t r e s e t d e v i c e s t h a t b r e a k t h e
Reset (On Model PBU-100
c i r c u i t t o e a c h o f t h e b l o w e r m o t o r t h r e e-
b e f o r e s e r i a l n u m b er
phase windings,
i f m o t o r i n p u t s a r e
PBU100442 and for Model
overloaded.
HEI-100)
2-2 Change 7
