Maintenance; Blower Assembly - Modine Manufacturing DBP Installation And Service Manual

maintenance

WARNING
When servicing or repairing this equipment, use only factory-
approved service replacement parts. A complete replacement
parts list may be obtained by contacting Modine Manufacturing
Company. Refer to the rating plate on the appliance for
complete appliance model number, serial number, and
company address. Any substitution of parts or controls not
approved by the factory will be at the owner's risk.
CAUTION
Do not attempt to reuse any mechanical or electrical controllers
which have been wet. Replace defective controller.
IMPORTANT
To check most of the Possible Remedies in the troubleshooting
guide listed in Table 50.1, refer to the applicable sections of the
manual.
All heating equipment should be serviced before each heating
season to assure proper operations. The following items may be
required to have more frequent service schedule based on the
environment in which the unit is installed, and the frequency of
the equipment operation.

Blower assembly

The blower assembly includes the bearings, drive sheaves and belts.
Blower bearings should be checked and lubricated based on the
blower manufacturer's recommendations. Bearings should also
be checked for any unusual wear and replaced if needed.
Drive sheaves should be checked at the same time the bearings
are inspected. Check to make sure the sheaves are in alignment
and are securely fastened to the blower and motor shafts.Belt
tension should be rechecked shortly after the unit has been
installed to check for belt stretching. After the initial start-up,
monthly checks are recommended.
filters
If the unit is supplied with a dirty filter switch and light, clean or
replace the filters any time the dirty filter light comes on.
Units which do not have a dirty filter warning light should have
the filters checked monthly. Clean or replace if necessary. In dirty
atmospheres, filter maintenance may be required more often.
figure 48.1 - filter replacement arrangement for
Blower size (digit 16) a, B, c, d, e, f, g and H
B
C
B
B
C
100/125
75
A
A
A
A
A
200/225
A = 20" X 25" FILTER
B = 16" X 25" FILTER
C = 15" X 25" FILTER
Filter Spacer to be inserted on non-access side of unit
48
FILTER SPACER
B
B
B
A
B
A
B
150/175
FILTER SPACER
A
A
C
A
A
A
C
A
A
250/300
350/400
500/600
700/800
figure 48.2 - filter replacement arrangement for
Blower size (digit 16) i, J, K, and l
a
a
NON-ACCESS
SIDE
a
a
c
c
250/300
500/600
manifold assembly removal
to remove the manifold
1. Shut off gas and electric supply.
2. Disconnect gas manifold at ground union joint.
3. Remove the two screws holding the manifold to the heat
exchanger support.
4. Slide the manifold through the manifold bracket.
5. Clean the orifices and adjust the air shutters as necessary.
6. Follow steps 3-6 in reverse order to install the manifold
assembly.
7. Turn on the electric and gas supply.
8. Check the ground union joint for leaks with a soap solution.
Tighten if necessary.
figure 48.3 - manifold assembly removal
SERIAL PLATE
BURNER SIDE
ACCESS PANEL
5-565.1
a
d
a
FILTER
SPACER
a
a
c
d
A = 20'' x 25''
a
B = 16'' x 25''
B
350/400
C = 20'' x 16''
700/800
D = 15'' X 25''
840/960
ELECTRICAL
a
NON-ACCESS
SIDE
FILTER
SPACER
a
B
JUNCTION
BOX
MANIFOLD