Bryant 352MAV Installation, Start-Up, And Operating Instructions Manual page 43

TABLE 10—MODEL 352MAV ORIFICE SIZE AND HIGH/LOW-HEAT MANIFOLD PRESSURE FOR CORRECT INPUT (CONT.)
(TABULATED DATA BASED ON 20,000/13,000 BTUH PER BURNER, DERATED 2 PERCENT FOR EACH 1000 FT ABOVE SEA
ALTITUDE AVG GAS
RANGE HEAT VALUE
(FT) (BTU/CU FT)
625
650
675
700
7001
725
to
750
8000
775
800
825
850
ALTITUDE AVG GAS
RANGE HEAT VALUE
(FT) (BTU/CU FT)
600
625
650
Altitudes
675
8001
700
to
725
9000
750
775
800
ALTITUDE AVG GAS
RANGE HEAT VALUE
(FT) (BTU/CU FT)
575
600
625
650
9001
to 675
10,000
700
725
750
775
*Orifice numbers shown in shading are factory installed.
NOTE: Percents of derate are based on midpoint of U.S. altitude ranges.
furnace must be derated 5 percent by an authorized Gas
Conversion Station or Dealer. To determine correct input
rate for altitude, see example above and use 0.95 as
derate multiplier factor.
b. Reinstall burner box cover.
NOTE: Clocking gas input rate MUST always be performed with
the burner box cover INSTALLED.
c. Check that gas valve adjustment caps are in place for
proper input to be clocked.
d. Obtain yearly heat value average for local gas supply.
NOTE: Be sure heating value of gas used for calculations is
correct for your altitude. Consult local gas utility for altitude
adjustment of gas heating value.
e. Check and verify orifice size in furnace. NEVER AS-
SUME THE ORIFICE SIZE. ALWAYS CHECK AND
VERIFY.
f. Turn off all other gas appliances and pilots.
FOR USE WITH 060 THROUGH 120 SIZE FURNACES ONLY
0.58 0.60
Orifice Manifold Orifice
no. Pressure no.
43 3.8/1.6 42
43 3.5/1.5 43
44 3.8/1.6 43
44 3.5/1.5 44
44 3.3/1.4 44
45 3.7/1.6 45
45 3.5/1.5 45
45 3.3/1.4 45
47 3.6/1.5 45
47 3.4/1.4 47
0.58 0.60
Orifice Manifold Orifice
no. Pressure no.
43 3.8/1.6 42
43 3.5/1.5 43
44 3.7/1.6 43
44 3.5/1.5 44
44 3.2/1.4 44
45 3.6/1.5 45
45 3.4/1.4 45
45 3.2/1.3 45
47 3.6/1.5 47
0.58 0.60
Orifice Manifold Orifice
no. Pressure no.
43 3.8/1.6 42
43 3.5/1.5 43
44 3.7/1.6 44
44 3.4/1.4 44
44 3.8/1.6 44
45 3.6/1.5 45
45 3.3/1.4 45
47 3.7/1.6 45
47 3.5/1.5 47
LEVEL)*
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold Orifice Manifold
Pressure no. Pressure
3.3/1.4 42 3.4/1.4
3.7/1.6 43 3.8/1.6
3.4/1.4 43 3.5/1.5
3.6/1.5 44 3.8/1.6
3.4/1.4 44 3.5/1.5
3.8/1.6 44 3.3/1.4
3.6/1.5 45 3.7/1.6
3.4/1.4 45 3.5/1.5
3.2/1.3 45 3.3/1.4
3.5/1.5 47 3.7/1.5
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold Orifice Manifold
Pressure no. Pressure
3.3/1.4 42 3.4/1.4
3.6/1.5 43 3.8/1.6
3.4/1.4 43 3.5/1.5
3.6/1.5 44 3.7/1.6
3.3/1.4 44 3.4/1.5
3.8/1.6 44 3.2/1.4
3.5/1.5 45 3.6/1.5
3.3/1.4 45 3.4/1.4
3.7/1.6 45 3.2/1.3
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold Orifice Manifold
Pressure no. Pressure
3.2/1.4 42 3.3/1.4
3.6/1.5 43 3.7/1.6
3.8/1.6 43 3.5/1.5
3.5/1.5 44 3.7/1.5
3.3/1.4 44 3.4/1.4
3.7/1.6 45 3.8/1.6
3.4/1.5 45 3.6/1.5
3.2/1.4 45 3.3/1.4
3.6/1.5 47 3.7/1.6
g. Move setup switch SW-1 to ON position. This keeps
furnace locked in low-heat operation.
h. Jumper R-to-W/W1.
i. Let furnace run for 3 minutes in low-heat operation.
j. Measure time (in sec) for gas meter to complete 1
revolution. Note reading.
k. Refer to Table 11 for cubic ft of gas per hr.
l. Multiply gas rate cu ft/hr by heating value (Btu/cu ft).
m. Move setup switch SW-1 to OFF position and jumper R
and W1 and W2 thermostat connections. This keeps
furnace locked in high-heat operation. Repeat items 'i'
through 'l' for high-heat operation.
—43—
0.64 0.66
Orifice Manifold Orifice
no. Pressure no.
42 3.5/1.5 42
42 3.2/1.4 42
43 3.6/1.5 43
43 3.4/1.4 43
44 3.6/1.5 44
44 3.4/1.4 44
45 3.8/1.6 44
45 3.6/1.5 45
45 3.4/1.4 45
45 3.2/1.3 45
0.64 0.66
Orifice Manifold Orifice
no. Pressure no.
42 3.5/1.5 42
42 3.2/1.4 42
43 3.6/1.5 43
44 3.8/1.6 43
44 3.6/1.5 44
44 3.3/1.4 44
45 3.8/1.6 44
45 3.5/1.5 45
45 3.3/1.4 45
0.64 0.66
Orifice Manifold Orifice
no. Pressure no.
42 3.3/1.5 42
42 3.2/1.3 42
43 3.6/1.5 43
44 3.8/1.6 43
44 3.5/1.5 44
44 3.3/1.4 44
45 3.7/1.6 45
45 3.4/1.5 45
45 3.2/1.4 45
Manifold
Pressure
3.6/1.5
3.3/1.4
3.7/1.6
3.5/1.5
3.7/1.6
3.5/1.5
3.3/1.4
3.7/1.6
3.5/1.5
3.3/1.4
Manifold
Pressure
3.6/1.5
3.3/1.4
3.7/1.6
3.4/1.5
3.7/1.6
3.4/1.4
3.2/1.4
3.6/1.5
3.4/1.4
Manifold
Pressure
3.6/1.5
3.3/1.4
3.7/1.6
3.4/1.4
3.6/1.5
3.4/1.4
3.8/1.6
3.5/1.5
3.3/1.4