Carrier DOWNFLOW HORIZONTAL 2-SPEED - Manual (Page 20)

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
625 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
650 45 3.7/1.5 45 3.8/1.6 44 3.3/1.3 44 3.4/1.4 44 3.5/1.4
675 46 3.6/1.5 46 3.7/1.5 46 3.8/1.6 45 3.8/1.6 44 3.2/1.3
7001 700 47 3.8/1.6 46 3.4/1.4 46 3.6/1.5 46 3.7/1.5 46 3.8/1.6
725 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
to 750 48 3.7/1.5 47 3.4/1.4 47 3.5/1.5 47 3.6/1.5 47 3.7/1.5
775 48 3.5/1.5 48 3.6/1.5 48 3.8/1.6 47 3.4/1.4 47 3.5/1.4
8000 800 48 3.3/1.4 48 3.4/1.4 48 3.5/1.5 48 3.6/1.5 48 3.7/1.5
825 49 3.6/1.5 49 3.8/1.6 48 3.3/1.4 48 3.4/1.4 48 3.5/1.5
850 49 3.4/1.4 49 3.5/1.5 49 3.7/1.5 49 3.8/1.6 48 3.3/1.4
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
600 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
625 46 3.6/1.5 46 3.7/1.5 46 3.8/1.6 45 3.8/1.6 44 3.2/1.3
8001 650 47 3.8/1.6 46 3.4/1.4 46 3.5/1.5 46 3.7/1.5 46 3.8/1.6
675 47 3.5/1.4 47 3.6/1.5 47 3.7/1.5 47 3.8/1.6 46 3.5/1.4
to 700 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
725 48 3.4/1.4 48 3.6/1.5 48 3.7/1.5 48 3.8/1.6 47 3.4/1.4
9000 750 49 3.8/1.6 48 3.3/1.4 48 3.4/1.4 48 3.5/1.5 48 3.7/1.5
775 49 3.5/1.5 49 3.7/1.5 49 3.8/1.6 48 3.3/1.4 48 3.4/1.4
800 49 3.3/1.4 49 3.4/1.4 49 3.5/1.5 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
575 46 3.6/1.5 46 3.7/1.5 46 3.8/1.6 45 3.8/1.6 44 3.2/1.3
600 47 3.7/1.5 46 3.4/1.4 46 3.5/1.5 46 3.6/1.5 46 3.8/1.6
9001 625 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
650 48 3.6/1.5 48 3.8/1.6 47 3.4/1.4 47 3.5/1.5 47 3.6/1.5
to 675 48 3.4/1.4 48 3.5/1.4 48 3.6/1.5 48 3.7/1.5 48 3.8/1.6
700 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
10,000 725 49 3.4/1.4 49 3.5/1.5 49 3.7/1.5 49 3.8/1.6 48 3.3/1.4
750 50 3.8/1.6 49 3.3/1.4 49 3.4/1.4 49 3.5/1.5 49 3.6/1.5
775 50 3.5/1.5 50 3.7/1.5 50 3.8/1.6 49 3.3/1.4 49 3.4/1.4
* 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.
20