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58TN0B/58TN1B: Installation, Start–Up, Operating and Service and Maintenance Instructions
(Tabulated Data Based on 21,000 BTUh High-Heat/14,500 BTUh for Low-Heat Per Burner, Derated 4 Percent for
AVG. GAS HEAT
ALTITUDE RANGE FT.
VALUE (BTUH/CU
(M)
5001 to
6000
USA
(1524 to
1829)
6001 to
7000
USA
(1829 to
2134)
7001 to
8000
USA
(2134 to
2438)
8001 to
9000
USA
(2438 to
2743)
9001 to
10,000
USA
(2743 to
3048)
* Orifice numbers 43 are factory installed
Adjust Temperature Rise
The furnace must operate within the temperature rise ranges specified on
the furnace rating plate. Do not exceed temperature rise range specified
on unit rating plate. Determine the temperature rise as follows:
CAUTION
!
FURNACE DAMAGE HAZARD
Failure to follow this caution may result in:
-
Overheating the heat exchangers or condensing flue gases in
heat exchanger areas not designed for condensate.
-
Shortened furnace life
-
Component damage.
Temperature rise must be within limits specified on furnace rating plate.
Recommended operation is at midpoint of rise range or slightly above.
NOTE: Blower access door must be installed when taking temperature
rise reading. Leaving blower access door off will result in incorrect
temperature measurements, due to possible changes in duct static
pressure and airflow.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Table 20 – Orifice Size and Manifold Pressure (in. w.c.) for Gas Input Rate
Each 1000 Ft. (305 M) Above Sea level) (Continued)
0.58
Manifold
Pressure
FT.)
Orifice No.
High/Low
725
44
3.5/1.7
750
44
3.3/1.6
775
45
3.7/1.8
800
46
3.7/1.8
825
46
3.5/1.7
850
47
3.7/1.8
875
47
3.5/1.7
900
48
3.8/1.8
675
44
3.5/1.7
700
44
3.3/1.6
725
45
3.7/1.8
750
46
3.6/1.7
775
46
3.4/1.6
800
47
3.6/1.7
825
47
3.4/1.6
850
48
3.7/1.7
650
44
3.3/1.6
675
45
3.7/1.8
700
46
3.6/1.7
725
47
3.8/1.8
750
47
3.5/1.7
775
48
3.8/1.8
800
48
3.6/1.7
825
48
3.3/1.6
625
45
3.7/1.8
650
46
3.6/1.7
675
47
3.8/1.8
700
47
3.5/1.7
725
48
3.7/1.8
750
48
3.5/1.7
775
49
3.8/1.8
600
46
3.6/1.7
625
47
3.7/1.8
650
47
3.4/1.6
675
48
3.6/1.7
700
48
3.4/1.6
725
49
3.7/1.8
SPECIFIC GRAVITY OF NATURAL GAS
0.60
Manifold
Pressure
Orifice No.
High/Low
Orifice No.
43
3.2/1.5
43
44
3.4/1.6
44
44
3.2/1.5
44
46
3.8/1.8
45
46
3.6/1.7
46
47
3.8/1.8
46
47
3.6/1.7
47
47
3.4/1.6
47
43
3.2/1.5
43
44
3.4/1.6
44
45
3.8/1.8
44
46
3.8/1.8
45
46
3.5/1.7
46
47
3.8/1.8
46
47
3.5/1.7
47
48
3.8/1.8
47
44
3.4/1.6
44
45
3.8/1.8
46
3.7/1.8
46
3.5/1.7
47
3.7/1.8
47
3.4/1.6
48
3.7/1.8
48
3.5/1.6
45
3.8/1.8
46
3.7/1.8
46
3.4/1.6
47
3.6/1.7
48
3.8/1.8
48
3.6/1.7
48
3.4/1.6
46
3.7/1.8
47
3.8/1.8
47
3.6/1.7
48
3.8/1.8
48
3.5/1.7
49
3.8/1.8
1. Place thermometers in return and supply ducts as close to furnace as
possible. Be sure thermometers do not see radiant heat from heat
exchangers. Radiant heat affects temperature rise readings. This
practice is particularly important with straight-run ducts.
2. When
thermometer
temperature from supply-air temperature to determine air
temperature rise.
NOTE: The temperatures read by the RAT and SAT sensors connected
to the control board can be displayed during heating and cooling
operation by enabling this feature in the (t°) menu item. See
Select F for Fahrenheit or C for Celsius. When enabled, the display will
cycle through the current operating mode, SAT, RAT, and temperature
differential. If displayed SAT value does not agree with measured
values, relocate SAT sensor farther away from furnace or after a bend in
the ductwork.
NOTE: Temperature rise can be determined for low-heat and high-heat
operation by locking the furnace in each mode of operation. The mode of
operation is based on the (Htt) setting on the furnace control board.
3. If the temperature rise is outside this range, first check:
a. Gas input for heating operation.
b. Derate for altitude if applicable.
37
0.62
Manifold
Pressure
High/Low
Orifice No.
3.3/1.6
43
3.5/1.7
43
3.3/1.6
44
3.8/1.8
44
3.7/1.8
46
3.5/1.7
46
3.7/1.8
46
3.5/1.7
47
3.3/1.6
43
3.5/1.7
43
3.3/1.6
44
3.7/1.8
45
3.6/1.7
46
3.4/1.6
46
3.6/1.7
47
3.4/1.6
47
3.5/1.7
43
44
3.3/1.6
44
46
3.8/1.8
45
46
3.6/1.7
46
47
3.8/1.8
46
47
3.6/1.7
47
48
3.8/1.8
47
48
3.6/1.7
48
44
3.3/1.6
44
46
3.8/1.8
45
46
3.5/1.7
46
47
3.7/1.8
46
47
3.5/1.7
47
48
3.7/1.8
48
48
3.5/1.7
48
46
3.8/1.8
45
46
3.5/1.7
46
47
3.7/1.8
47
47
3.4/1.6
47
48
3.6/1.7
48
48
3.4/1.6
48
readings
stabilize,
subtract
0.64
Manifold
Pressure
High/Low
3.4/1.6
3.2/1.5
3.4/1.6
3.2/1.5
3.8/1.8
3.6/1.7
3.4/1.6
3.7/1.7
3.4/1.6
3.2/1.5
3.4/1.6
3.8/1.8
3.8/1.8
3.5/1.7
3.8/1.8
3.5/1.7
3.2/1.5
3.4/1.6
3.8/1.8
3.7/1.8
3.5/1.6
3.7/1.7
3.4/1.6
3.7/1.8
3.4/1.6
3.8/1.8
3.7/1.7
3.4/1.6
3.6/1.7
3.8/1.8
3.6/1.7
3.7/1.8
3.6/1.7
3.8/1.8
3.5/1.7
3.7/1.8
3.5/1.7
return-air
Fig.
45.
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