Selecting Nozzle Size - Rheem OBF Series Installation Instructions Manual

SELECTING NOZZLE SIZE

All furnaces are capable of firing at
multiple rates (see Table 3). The
furnaces are shipped with the highest
heat output rate nozzle installed.
Smaller nozzles are included in the
parts bag, shipped with the furnace.
Select the appropriate nozzle by
determining the load requirements of
the house and comparing it to the Net
Input (see Table 3). If the load is
greater than the Net Input for the
nozzle, select the next highest nozzle
size. Use Table 1 to select the
appropriate flow speed for the nozzle
size selected.
CAUTION
!
NOZZLE CHANGES/INPUT RATE
DETERMINATION SHOULD ONLY
BE MADE BY A QUALIFIED
SERVICE TECHNICIAN.
FIGURE 3
THIS FURNACE WAS INSTALLED WITH
A NOZZLE HAVING A FIRING RATE OF
.50 GALLONS PER HOUR AND AN
INPUT RATING OF 70,000 BTUH.
92-100538-01A-00
THIS FURNACE WAS INSTALLED WITH
A NOZZLE HAVING A FIRING RATE OF
.60 GALLONS PER HOUR AND AN
INPUT RATING OF 84,000 BTUH.
92-100538-01B-00
THIS FURNACE WAS INSTALLED WITH
A NOZZLE HAVING A FIRING RATE OF
.75 GALLONS PER HOUR AND AN
INPUT RATING OF 105,000 BTUH.
92-100538-01C-00
THIS FURNACE WAS INSTALLED WITH
A NOZZLE HAVING A FIRING RATE OF
.85 GALLONS PER HOUR AND AN
INPUT RATING OF 119,000 BTUH.
92-100538-01D-00
THIS FURNACE WAS INSTALLED WITH
A NOZZLE HAVING A FIRING RATE OF
1.00 GALLONS PER HOUR AND AN
INPUT RATING OF 140,000 BTUH.
92-100538-01E-00
THIS FURNACE WAS INSTALLED WITH
A NOZZLE HAVING A FIRING RATE OF
1.20 GALLONS PER HOUR AND AN
INPUT RATING OF 168,000 BTUH.
92-100538-01F-00
THIS FURNACE WAS INSTALLED WITH
A NOZZLE HAVING A FIRING RATE OF
1.35 GALLONS PER HOUR AND AN
INPUT RATING OF 189,000 BTUH.
92-100538-01G-00
INSTRUCTIONS:
PEEL OFF APPROPRIATE LABEL AND APPLY
ADJACENT TO FURNACE RATING LABEL. FIRING
RATE AND INPUT RATING ON LABEL MUST
AGREE WITH THE ACTUAL FIRING RATE AND
INPUT RATING OF THE FURNACE AS INSTALLED.
DISCARD REMAINING LABELS.
92-100538-01-00
6
TABLE 3
UPFLOW HEATING CAPACITY
DELAVAN
MODEL
NOZZLE
NUMBER
SIZES
-067 —
-112 (1.0) -70°B
-150 (1.2, 1.35) - 70°B
FIGURE 2
TYPICAL RATING PLATE INFORMATION
NOTE:
When installing the furnace, be sure to
mark the appropriate firing rate/nozzle
size on the rating label (see Figure 2)
by scratching the surface off of the
appropriate square. The appropriate
label from sheet 92-100538-01 (see
Figure 3) must also be applied near the
rating plate.
DEL-O-FLO GROSS
NOZZLE INPUT
SIZES (BTUH)
70,000
(.50, .65) - 70°B
84,000
105,000
(.75, .85) - 70°B 119,000
140,000
168,000
—
189,000
NET AFUE
INPUT (ISOLATED
(BTUH) COMBUSTION)
58,000 82.9%
67,000 80.8%
86,100 82.0%
96,900 81.4%
112,000 80.0%
136,000 81.0%
154,000 81.5%