Bryant 574B User Manual page 18

574B ECM AIR FLOW VS. TEMPERATURE RISE CHART
UNIT COOLING SIZE
574B
574B
574B
574B
574B
574B
574B
574B
574B
574B
574B
574B
574B
NATURAL GAS ONLY
ORIFICE CONVERSION — 3.5 in. wc
MANIFOLD PRESSURE*
INPUT
ALTITUDE (ft)
(Btuh)
40,000
60,000
0-2000 90,000
115,000
130,000
32,075
48,547
2001-6000 72,820
90,094
102,630
* As the height above sea level increases, there is less oxygen per cubic ft of air.
Therefore, heat input rate should be reduced at higher altitudes.
† Orifices available through your Bryant distributor.
UNIT
SIZE
600 700
024 0.005
0.007
030 —
0.007
036
— —
042
— —
048
— —
060
— —
RATED GAS
INPUT RATE
(X 1000)
024 40
030 40
030 60
036 60
036 90
042 60
042 90
048 90
048 115
048 130
060 90
060 115
060 130
PERFORMANCE DATA (CONT)
ECONOMIZER/1-IN. FILTER PRESSURE DROP
UNIT 574B
024-036
042-060
HIGH ALTITUDE COMPENSATION
OUTPUT ORIFICE
(Btuh) NUMBER†
31,000 #44
46,000 #38
70,000 #38
92,000 #33
103,000 #31
24,858 #48
37,219 #42
56,638 #42
72,075 #37
81,315 #34
574B ECM WET COIL PRESSURE DROP
800 900 1000 1100
0.010 0.012 0.015 —
0.010 0.012 0.015 0.018
— 0.019 0.023 0.027
— — 0.014 0.017
— — — —
— — — —
AIRFLOW SETTING CALCULATED
EAST SELECT™ TEMPERATURE
(SCFM)
800
800
1100
1100
1200
1000
1250
1250
1600
1750
1600
1600
1800
PRESSURE DROP
0.20
0.25
ORIFICE CONVERSION — 3.5 in. wc
ALTITUDE (ft)
0-2000
2001-6000
STANDARD CFM
1200 1300 1400 1500
— — — —
0.021 0.024 — —
0.032 0.037 0.042 0.047
0.020 0.024 0.027 0.031
0.027 0.032 0.036 0.041
— — — 0.029
—18—
MIN.
TEMP TEMP
RISE RISE
36.5 20
36.5 20
40 35
40 25
54 45
44 20
53 35
53 25
53 35
54 40
41 25
53 35
53 40
(in. wg)
LIQUID PROPANE ONLY
MANIFOLD PRESSURE*
INPUT OUTPUT
(Btuh) (Btuh)
40,000 31,000
57,000 43,720
85,500 66,520
115,000 92,000
127,000 100,580
33,834 26,221
49,238 37,766
73,856 57,461
94,571 75,657
101,284 80,214
1600 1700 1800 1900
— — — —
— — — —
— — — —
0.035 0.039 0.043 —
0.046 0.052 0.057 0.063
0.032 0.036 0.040 0.045
MAX MAX
DISCH.
RISE TEMP
50 175
50 175
65 165
55 165
75 175
50 165
65 170
55 165
65 170
70 175
55 155
65 170
70 175
ORIFICE
NUMBER†
#50
#46
#46
#42
#41
#52
#48
#48
#44
#43
2000 2100
— —
— —
— —
— —
0.068 —
0.049 0.053