Bryant 352MAV Installation, Start-Up, And Operating Instructions Manual page 41

TABLE 10—MODEL 352MAV ORIFICE SIZE AND HIGH/LOW-HEAT MANIFOLD PRESSURE FOR CORRECT INPUT
(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)
850
875
900
925
950
0
to 975
2000
1000
1025
1050
1075
1100
ALTITUDE AVG GAS
RANGE HEAT VALUE
(FT) (BTU/CU FT)
775
800
Altitudes
825
2001
to 850
3000
875
or
900
Canada
925
Altitudes
2000 950
to
975
4500
1000
1025
ALTITUDE AVG GAS
RANGE HEAT VALUE
(FT) (BTU/CU FT)
750
775
800
825
850
3001
to 875
4000
900
925
950
975
1000
* Orifice numbers shown in shading are factory installed.
NOTE: Percents of derate are based on midpoints of U.S. altitude ranges.
NOTE: DO NOT set low-heat manifold pressure less than 1.3-in.
wc or more than 1.7-in. wc for natural gas. If manifold pressure is
outside this range, change main burner orifices.
CAUTION: DO NOT bottom out gas valve regulator
adjusting screw. This can result in unregulated manifold
pressure and result in excess overfire and heat exchanger
failures.
NOTE: If orifice hole appears damaged or it is suspected to have
been redrilled, check orifice hole with a numbered drill bit of
correct size. Never redrill an orifice. A burr-free and squarely
aligned orifice hole is essential for proper flame characteristics.
FOR USE WITH 060 THROUGH 120 SIZE FURNACES ONLY
0.58 0.60
Orifice Manifold Orifice
no. Pressure no.
43 3.7/1.5 43
43 3.5/1.5 43
44 3.7/1.6 43
44 3.5/1.5 44
44 3.4/1.4 44
44 3.2/1.3 44
45 3.7/1.6 45
45 3.5/1.5 45
45 3.3/1.4 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 3.8/1.6 43
44 3.6/1.5 44
44 3.4/1.4 44
44 3.2/1.4 44
45 3.7/1.5 45
45 3.5/1.5 45
45 3.3/1.4 45
47 3.7/1.6 45
47 3.6/1.5 47
0.58 0.60
Orifice Manifold Orifice
no. Pressure no.
43 3.7/1.6 43
43 3.5/1.5 43
44 3.7/1.6 43
44 3.5/1.5 44
44 3.3/1.4 44
45 3.8/1.6 44
45 3.6/1.5 45
45 3.4/1.4 45
45 3.2/1.4 45
47 3.6/1.5 45
47 3.5/1.5 47
LEVEL)*
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold Orifice Manifold
Pressure no. Pressure
3.8/1.6 42 3.2/1.4
3.6/1.5 43 3.7/1.6
3.4/1.4 43 3.5/1.5
3.7/1.6 44 3.8/1.6
3.5/1.5 44 3.6/1.5
3.3/1.4 44 3.4/1.4
3.8/1.6 44 3.2/1.4
3.6/1.5 45 3.7/1.6
3.4/1.5 45 3.6/1.5
3.3/1.4 45 3.4/1.4
3.7/1.6 45 3.2/1.4
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold Orifice Manifold
Pressure no. Pressure
3.2/1.4 42 3.3/1.4
3.7/1.5 43 3.8/1.6
3.4/1.5 43 3.6/1.5
3.7/1.6 44 3.8/1.6
3.5/1.5 44 3.6/1.5
3.3/1.4 44 3.4/1.4
3.8/1.6 44 3.2/1.4
3.6/1.5 45 3.7/1.6
3.4/1.4 45 3.5/1.5
3.2/1.4 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
3.8/1.6 42 3.3/1.4
3.6/1.5 43 3.7/1.6
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
3.2/1.4 44 3.3/1.4
3.7/1.6 45 3.8/1.6
3.5/1.5 45 3.6/1.5
3.3/1.4 45 3.4/1.5
3.2/1.3 45 3.3/1.4
3.6/1.5 45 3.7/1.6
f. Move setup switch SW-1 to OFF position after complet-
ing low-heat adjustment.
g. Jumper R and W1 and W2 thermostat connections on
control. (See Fig. 32.) This keeps furnace locked in
high-heat operation.
h. Turn high-heat adjusting screw (3/32 hex Allen wrench)
counterclockwise (out) to decrease input rate or clock-
wise (in) to increase rate.
NOTE: DO NOT set high-heat manifold pressure less than 3.2-in.
wc or more than 3.8-in. wc for natural gas. If manifold pressure is
outside this range, change main burner orifices.
—41—
0.64 0.66
Orifice Manifold Orifice
no. Pressure no.
42 3.3/1.4 42
43 3.8/12.6 42
43 3.6/1.5 43
43 3.4/1.4 43
44 3.7/1.6 44
44 3.5/1.5 44
44 3.4/1.4 44
44 3.2/1.3 44
45 3.7/1.6 45
45 3.5/1.5 45
45 3.4/1.4 45
0.64 0.66
Orifice Manifold Orifice
no. Pressure no.
42 3.4/1.4 42
42 3.2/1.4 42
43 3.7/1.5 43
43 3.5/1.5 43
44 3.7/1.6 43
44 3.5/1.5 44
44 3.3/1.4 44
45 3.8/1.6 44
45 3.6/1.5 45
45 3.5/1.5 45
45 3.3/1.4 45
0.64 0.66
Orifice Manifold Orifice
no. Pressure no.
42 3.4/1.4 42
43 3.8/1.6 42
43 3.6/1.5 43
43 3.4/1.4 43
44 3.7/1.5 44
44 3.5/1.5 44
44 3.3/1.4 44
45 3.7/1.6 44
45 3.5/1.5 45
45 3.4/1.4 45
45 3.2/1.4 45
Manifold
Pressure
3.4/1.4
3.2/1.4
3.7/1.6
3.5/1.5
3.8/1.6
3.6/1.5
3.5/1.5
3.3/1.4
3.8/1.6
3.6/1.5
3.5/1.5
Manifold
Pressure
3.5/1.5
3.3/1.4
3.8/1.6
3.6/1.5
3.4/1.4
3.6/1.5
3.4/1.5
3.3/1.4
3.8/1.6
3.6/1.5
3.4/1.4
Manifold
Pressure
3.5/1.5
3.2/1.4
3.7/1.6
3.5/1.5
3.8/1.6
3.6/1.5
3.4/1.4
3.2/1.3
3.7/1.5
3.5/1.5
3.3/1.4