Modine Manufacturing PV Installation And Service Manual page 25

S S E E R R V V I I C C E E I I N N S S T T R R U U C C T T I I O O N N S S – – G G E E N N E E R R A A L L
G G e e n n e e r r a a l l M M a a i i n n t t e e n n a a n n c c e e
The unit and venting system must be checked once a year by a
qualified service technician.
O O n n l l y y p p e e o o p p l l e e t t r r a a i i n n e e d d a a n n d d f f a a m m i i l l i i a a r r w w i i t t h h t t h h e e o o p p e e r r a a t t i i o o n n o o f f u u n n i i t t
h h e e a a t t e e r r s s a a n n d d t t h h e e i i r r c c o o n n t t r r o o l l s s s s h h o o u u l l d d s s e e r r v v i i c c e e t t h h i i s s e e q q u u i i p p m m e e n n t t . .
1. Service air moving components annually.
a. On propeller units this includes checking motors for
lubrication if motors are not the permanently lubricated
type and check fan for fit on motor shaft and for
damage to blades.
b. On blower units this should include:
(1) Checking motor and blower bearings for lubrication.
(2) Checking belt and sheave for proper alignment and
adjustment.
(3) Checking cleanliness of blower wheel and filters.
2. Keep unit free from dust, dirt, grease, and foreign matter,
paying particular attention to:
a. Combustion air inlets.
b. Burner ports, pilot burner, and main burner orifices
(avoid use of hard, sharp instruments capable of
damaging surfaces, for cleaning these ports.) If air
pressure is available, use air hose to blow out dirt and
other foreign matter from within the burner. Also main
burner orifices should be checked for blockage due to
spider webs, etc.
c. Primary air shutters (when used).
d. Clean heat exchanger tubes from bottom with stiff brush
after removing burner (Do not use wire brush).
T T R R O O U U B B L L E E S S H H O O O O T T I I N N G G G G U U I I D D E E
F F i i g g u u r r e e 1 1 7 7
M M a a n n i i f f o o l l d d A A d d j j u u s s t t m m e e n n t t , , N N a a t t u u r r a a l l G G a a s s
MANIFOLD
MIXER
TUBES
BURNER
RETAINING PIN
C C o o m m b b u u s s t t i i o o n n S S y y m m p p t t o o m m s s a a n n d d D D i i a a g g n n o o s s i i s s
To realize full gas heating value requires periodic inspections
with proper combustion control corrections as outlined and
illustrated here.
1 1 . . L L i i f f t t i i n n g g F F l l a a m m e e s s
Lifting flames rise unevenly above the burner port and may
occur on few or all the ports. Sometimes the flames drop
and lift intermittently. Lifting can be eliminated by reducing
primary air. If flame cannot be adjusted properly, check input
rate to heater and manifold gas pressure; reduce if
necessary. Check the orifice size with those listed in Table
5a to be sure the unit is not operating over rated input.
MAIN
BURNER
ORIFICES
MANIFOLD MOUNTING
SCREW AND PIN
e. Bottom pan.
f. Fan blade.
3. Check wiring for possible loose connections.
4. Where gas contains considerable impurities, occasional
cleaning of automatic gas valves is required.
5. Controls – See control instruction sheets furnished
separately with the unit heater.
6. Power exhauster assembly – The power exhauster motor
bearings have been lubricated for long life and do not
require additional lubrication. In dirty atmosphere, it may be
desirable to clean the motor and blower housing and blow
out the cooling air passages of the motor with compressed
air.
T T o o R R e e m m o o v v e e B B u u r r n n e e r r
1. Turn off all electricity and gas to unit.
2. Lower bottom pan to expose burner and manifold. See
Figure 2, Page 2.
3. Disconnect pilot supply line and pilot ignition leads to the
controls.
4. Remove the two burner retaining pins holding the burner in
place. The burner can then be easily lowered from the unit.
In replacing the burner, be certain that the slots at the front
of the burner are located properly on their shoulder rivets
and that the burner retaining pins are put back into their
proper locations.
F F i i g g u u r r e e 1 1 9 9
A A i i r r S S h h u u t t t t e e r r A A d d j j u u s s t t m m e e n n t t , , P P r r o o p p a a n n e e G G a a s s
MANIFOLD
SHUTTER
MIXER
TUBES
F F i i g g u u r r e e 1 1 8 8
L L i i f f t t i i n n g g F F l l a a m m e e C C o o n n d d i i t t i i o o n n
MAIN
BURNER
AIR
ORIFICE
2 2 5 5