Modine Manufacturing PDE Installation And Service Manual page 10

5 5 . . R R E E P P L L A A C C E E M M E E N N T T O O F F P P A A R R T T S S
CAUTION
!
Always turn off the gas supply at the gas cock and
disconnect the electricity supply to the appliance before
servicing or replacing any components.
T T o o r r e e p p l l a a c c e e : :
5 5 . . 1 1 B B u u r r n n e e r r / / p p i i l l o o t t / / t t h h e e r r m m o o c c o o u u p p l l e e
Lower bottom pan by removing wing screws on the unit base.
Disconnect pilot pipe, and thermocouple lead from multifunctional
control.
Remove the two burner retaining pins holding the burner
assembly in place.
I I M M P P O O R R T T A A N N T T : : D D o o n n o o t t a a t t t t e e m m p p t t t t o o r r e e m m o o v v e e t t h h e e g g a a s s m m a a n n i i f f o o l l d d t t o o
e e a a s s e e r r e e m m o o v v a a l l o o f f t t h h e e b b u u r r n n e e r r a a s s t t h h i i s s c c o o u u l l d d s s e e r r i i o o u u s s l l y y a a f f f f e e c c t t t t h h e e
c c o o r r r r e e c c t t o o p p e e r r a a t t i i o o n n o o f f t t h h e e a a p p p p l l i i a a n n c c e e i i f f i i t t i i s s n n o o t t r r e e -p p o o s s i i t t i i o o n n e e d d e e x x a a c c t t l l y y
a a s s i i n n t t e e n n d d e e d d . . T T h h e e a a s s s s e e m m b b l l y y c c a a n n n n o o w w b b e e l l o o w w e e r r e e d d f f r r o o m m t t h h e e u u n n i i t t . .
N N O O T T E E : : O O n n r r e e f f i i t t t t i i n n g g t t h h e e b b u u r r n n e e r r a a s s s s e e m m b b l l y y e e n n s s u u r r e e t t h h a a t t t t h h e e s s l l o o t t s s a a t t
t t h h e e f f r r o o n n t t o o f f t t h h e e b b u u r r n n e e r r a a r r e e c c o o r r r r e e c c t t l l y y l l o o c c a a t t e e d d o o n n t t h h e e i i r r s s h h o o u u l l d d e e r r
r r i i v v e e t t s s a a n n d d t t h h a a t t t t h h e e r r e e t t a a i i n n i i n n g g p p i i n n s s a a r r e e r r e e f f i i t t t t e e d d i i n n t t h h e e c c o o r r r r e e c c t t
l l o o c c a a t t i i o o n n . .
5 5 . . 1 1 . . 1 1 B B u u r r n n e e r r
It is not possible to replace single burner bars. The complete burner
assembly must be replaced. Remove the pilot and thermocouple (see
5.1.2.) and refit to the new assembly.
5 5 . . 1 1 . . 2 2 P P i i l l o o t t
Remove the burner assembly as detailed above. Unscrew the
thermocouple. Undo the pilot bracket retaining the nut. The pilot gas pipe
can now be unscrewed (take care not to lose the pilot injector) and the
pilot assembly released by removing the two retaining screws. Replace
defective component and reassemble in reverse order.
5 5 . . 2 2 T T h h e e r r m m o o c c o o u u p p l l e e
Lower bottom pan by removing wing screws on the unit base.
The thermocouple can be unscrewed.
5 5 . . 3 3 M M a a i i n n B B u u r r n n e e r r I I n n j j e e c c t t o o r r
Lower bottom pan by removing wing screws on the unit base.
The main injector can be unscrewed from the manifold and
replaced.
5 5 . . 4 4 G G a a s s V V a a l l v v e e
Disconnect pilot gas pipe, thermocouple and thermocouple
interrupter from the gas valve.
Remove green cover from the solenoid actuator on the valve
and detach flying leads from the terminal block, noting their
position.
Having ensured isolation of the gas supply uncouple the union
gas cock and unscrew the gas valve from the appliance inlet
gas pipe.
Replace gas valve and reassemble in reverse order.
5 5 . . 5 5 T T h h e e r r m m o o c c o o u u p p l l e e I I n n t t e e r r r r u u p p t t e e r r
Unscrew thermocouple from top of gas valve and extract
thermocouple interrupter from the gas valve. Release spade
connections on interrupter cable from the overheat thermostat in
the heater junction box and feed back through the cable
grommet. Replace component and reassemble in reverse order.
1 1 0 0
5 5 . . 6 6 D D e e l l a a y y T T i i m m e e r r
The delay timer is located in the junction box. Remove the
junction box front cover by taking out the two retaining screws.
Remove the single retaining screw from beneath the junction
box, pull off the electrical connectors (taking care to note their
positions) and lift out the timer. Replace defective component
and reassemble in reverse order. If in doubt regarding the
electrical connections consult the wiring diagram on page 9.
5 5 . . 7 7 O O v v e e r r h h e e a a t t T T h h e e r r m m o o s s t t a a t t
The overheat thermostat body is located in the junction box.
Remove the junction box cover by taking out the two retaining
screws. Remove the thermostat cover retaining nut from the
outside of the junction box and pull back into the box. Remove
the left hand side casing of the heater (looking from the front)
by taking out the two retaining screws at the rear and pull the
side panel clear. The overheat thermostat bulb is mounted in the
air stream at the bottom left of the appliance. Remove the two
screws holding it in place and feed it back through the hole in
the inner casing. To refit remove the two lower front louvres
which can be sprung out. The thermostat bulb can now be
positioned and the retaining screws fitted.
5 5 . . 8 8 F F a a n n / / F F a a n n M M o o t t o o r r / / C C a a p p a a c c i i t t o o r r
The capacitor is mounted alongside the junction box. Remove
the junction box front cover by taking out two retaining screws.
Disconnect the wires from the terminal block noting their
position.The capacitor retaining nut can be seen on the left hand
side of the junction box and should be removed. Replace the
defective component and reassemble in reverse order. If in doubt
regarding the electrical connections consult the wiring diagram
on page 9.
The fan/fan motor is mounted in the centre of the guard. Remove
the junction box front cover by taking out two retaining screws.
Disconnect the fan motor wires from the terminal block noting
their position and feed back through the grommet. Remove the
four guard mounting bolts and lift assembly clear. The fan and
motor can be removed from the guard by undoing the four bolts.
I I M M P P O O R R T T A A N N T T : : C C a a r r e e m m u u s s t t b b e e t t a a k k e e n n t t o o n n o o t t e e i i f f t t h h e e g g u u a a r r d d i i s s
m m o o u u n n t t e e d d o o n n t t h h e e f f r r o o n n t t o o r r r r e e a a r r f f i i x x i i n n g g p p o o i i n n t t s s o o f f t t h h e e m m o o t t o o r r . . I I n n c c o o r r r r e e c c t t
r r e e -a a s s s s e e m m b b l l y y w w i i l l l l c c a a u u s s e e d d a a m m a a g g e e t t o o t t h h e e u u n n i i t t . .
The fan can be removed from the motor by removing the
retaining screw.
Reassemble in reverse order making sure the fan and guard are
correctly mounted using the four sleeves to prevent
overtightening, and that the fan spins freely without catching on
the casing. If in doubt as to the correct electrical connection
consult the wiring diagram on page 9.