Adjustment of blower speed, Color code for speed taps, Drive types – Bryant 394 Gas User Manual
Page 5: Iv. care and maintenance, Care of blowers, Belt tension, Filters, Figure 4 - flue-baffle retainer strip
Attention! The text in this document has been recognized automatically. To view the original document, you can use the "Original mode".
Adjustment of Blower Speed
^ our-Speed Direct Drive
To change motor speed taps, remove the motor tap
lead (see Figure 1) and relocate it on the desired ter
minal on the plug-in terminal block/speed selector
located on the dividing panel. See Table I.
Belt Drive
The blower speed may be changed by opening or clos
ing the motor pulley. When adjusting blower speed,
be certain that the pulleys are properly aligned.
TABLE 1 - Factory Setting Blower Motor Chart
Drive Type
Unit
L
M
E
B
c
cx
Size
Red
Blue
Red
Blue Red Blue
Red
Red
Red
to
to*
to
to
to
to
to
to
to
50
4
4
1
80
3
3
1
4
1
100
2
1
3
1
4
1
125
3
1
3
1
3
1
1
1
1
137
2
1
2
1
2
1
1
1
1
165
2
1
1
1
190
1
1
1
220
1
1
*Use when factory Relay Kit is field installed.
Color Code for Speed Taps
Common (white).................................................#C Tap
Hi Speed (black).................................................. #1 Tap
Med Speed (blue).................................................#2 Tap
Med-Lo Speed (yellow)....................................# 3 Tap
Lo Speed (red)......................................................#4 Tap
C.AUTION: When adjusting the blower .speed. ma|
certain that the temperature rise acn>ss the heat
changer doe.s not exceed that specified on the rati|
DRIVE TYPES
B — Belt drive heating —minimum cooling
C — Belt drive heating and cooling
X— Belt drive heating—maximum cooling
L — Multi-speed direct drive heating —minimum cooling
E — Multi-speed direct drive heating —maximum cooling with evaporator
blower motor relay.
M —Mutli-speed direct drive heating —minimum cooling with evaporator
blower motor relay.
IV. CARE AND MAINTENANCE
Cleaning
The heat exchanger should be examined periodically
to see if there has been an accumulation of rust, soot,
etc. Clean as follows;
1. Disconnect pilot tubing.
2. Disconnect electrical lead from pilot. (In case of
100% shut-off controls, disconnect pilot thermocouple
lead from pilot relay or inline shut-off valve.)
3. Remove front plate from draft diverter (4 sheet-
metal screws).
4. Remove burners and pilot as follows:
a. Remove Tinnerman clamp from burner-holding
stud.
b. Slide burner off orifice and remove under
manifold.
c. Pilot is attached to one burner and is removed
with that burner. It is not necessary to detach
pilot before removing burner.
5. Remove metal angle strip holding flue baffles in
place. See Figure 4.
6. Remove flue baffles. See Figure 5.
7. Use flexible-handled steel cleaning brush to loosen
scale and soot. Remove scrapings from bottom of
combustion chamber.
8. Reassemble furnace by reversing above procedure.
NOTE: There is a slot in the back of the heat ex
changer for the back tip of the burner to fit into. When
properly placed, the burner will fit into this slot and
will be level.
Care of Blowers
All motors on the belt drive blowers are provided with
oil cups and should be oiled at least twice a year with
a nondetergent SAE 30 oil.
Belt Tension
Adjust tension on a V-belt so that the belt deflects
approximately 3/4 to 1 inch when the pressure from
one finger is applied midway between the blower and
motor pulleys. Adjust the tension by turning the motor
adjusting screw.
Filters
Some units are equipped with a permanent fiber filter
(recognizable by its distinct green color). To clean this
filter, run water through the fibers from the leaving
air side. Do not spray this filter with water-soluble oil.
Figure 4 - Flue-Baffle Retainer Strip
A66475
Figure 5 - Removing Baffles
A66476
-
5
-