Carrier DOWNFLOW HORIZONTAL 2-SPEED - Manual (Page 19)

Table 10—Model 58TMA Orifice Size and Manifold Pressure for Correct Input—Continued
(TABULATED DATA BASED ON 21,000 BTUH HIGH HEAT/13,500 BTUH LOW HEAT PER BURNER,
DERATED 4% FOR EACH 1000 FT ABOVE SEA LEVEL)*
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
AT ALTITUDE
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64 0.66
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
U.S.A.
Only
725 44 3.8/1.6 43 3.4/1.4 43 3.5/1.4 43 3.6/1.5 43 3.7/1.5
750 44 3.5/1.5 44 3.6/1.5 44 3.8/1.6 43 3.4/1.4 43 3.5/1.4
775 44 3.3/1.4 44 3.4/1.4 44 3.5/1.5 44 3.6/1.5 44 3.7/1.5
4001 800 45 3.7/1.5 44 3.2/1.3 44 3.3/1.4 44 3.4/1.4 44 3.5/1.5
825 46 3.7/1.5 46 3.8/1.6 45 3.8/1.6 44 3.2/1.3 44 3.3/1.4
to 850 46 3.5/1.4 46 3.6/1.5 46 3.7/1.5 46 3.8/1.6 45 3.8/1.6
875 47 3.7/1.5 46 3.4/1.4 46 3.5/1.5 46 3.6/1.5 46 3.7/1.5
5000 900 47 3.5/1.5 47 3.6/1.5 47 3.8/1.6 46 3.4/1.4 46 3.5/1.5
925 48 3.8/1.6 47 3.4/1.4 47 3.6/1.5 47 3.7/1.5 47 3.8/1.6
950 48 3.6/1.5 48 3.7/1.5 48 3.8/1.6 47 3.5/1.4 47 3.6/1.5
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
AT ALTITUDE
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64 0.66
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
U.S.A.
Only
700 44 3.5/1.5 44 3.6/1.5 44 3.8/1.6 43 3.4/1.4 43 3.5/1.4
725 44 3.3/1.4 44 3.4/1.4 44 3.5/1.4 44 3.6/1.5 44 3.7/1.5
750 45 3.7/1.5 44 3.2/1.3 44 3.3/1.4 44 3.4/1.4 44 3.5/1.4
775 46 3.6/1.5 46 3.8/1.6 45 3.7/1.5 44 3.2/1.3 44 3.3/1.4
5001 800 46 3.4/1.4 46 3.5/1.5 46 3.7/1.5 46 3.8/1.6 45 3.7/1.5
825 47 3.7/1.5 47 3.8/1.6 46 3.4/1.4 46 3.6/1.5 46 3.7/1.5
to 850 47 3.4/1.4 47 3.6/1.5 47 3.7/1.5 47 3.8/1.6 46 3.5/1.4
875 48 3.7/1.5 48 3.8/1.6 47 3.5/1.4 47 3.6/1.5 47 3.7/1.5
6000 900 48 3.5/1.4 48 3.6/1.5 48 3.7/1.5 47 3.4/1.4 47 3.5/1.4
925 48 3.3/1.4 48 3.4/1.4 48 3.5/1.5 48 3.6/1.5 48 3.8/1.6
950 49 3.7/1.5 49 3.8/1.6 48 3.3/1.4 48 3.5/1.4 48 3.6/1.5
975 49 3.5/1.4 49 3.6/1.5 49 3.7/1.5 48 3.3/1.4 48 3.4/1.4
1000 49 3.3/1.4 49 3.4/1.4 49 3.6/1.5 49 3.7/1.5 49 3.8/1.6
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
AT ALTITUDE
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64 0.66
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
U.S.A.
Only
650 44 3.5/1.5 44 3.7/1.5 44 3.8/1.6 43 3.4/1.4 43 3.5/1.4
675 44 3.3/1.4 44 3.4/1.4 44 3.5/1.4 44 3.6/1.5 44 3.7/1.5
700 45 3.7/1.5 44 3.2/1.3 44 3.3/1.3 44 3.4/1.4 44 3.5/1.4
6001 725 46 3.6/1.5 46 3.7/1.5 45 3.7/1.5 45 3.8/1.6 44 3.2/1.3
750 47 3.8/1.6 46 3.5/1.4 46 3.6/1.5 46 3.7/1.5 46 3.8/1.6
to 775 47 3.6/1.5 47 3.7/1.5 47 3.8/1.6 46 3.5/1.4 46 3.6/1.5
800 48 3.8/1.6 47 3.5/1.4 47 3.6/1.5 47 3.7/1.5 47 3.8/1.6
7000 825 48 3.6/1.5 48 3.7/1.5 48 3.8/1.6 47 3.5/1.4 47 3.6/1.5
850 48 3.4/1.4 48 3.5/1.4 48 3.6/1.5 48 3.7/1.5 47 3.4/1.4
875 49 3.8/1.6 48 3.3/1.4 48 3.4/1.4 48 3.5/1.5 48 3.6/1.5
* For 125-20 size only, input is 20,500 Btuh for high fire. Deduct 0.1-in. from manifold pressure shown in table. Change orifice size if manifold pressure falls below 3.2-in.
wc.
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