Set Temperature Rise - Carrier 58TMA Installation, Start-Up, And Operating Instructions Manual

Table 8—Model 58TMA Orifice Size and Manifold Pressure for Correct Input Rate
(Tabulated Data Based on Altitude Up to 2000 ft and 21,000 Btuh High Heat/13,500 Btuh Low Heat Per Burner)*
GAS
HEAT 0.58
VALUE
Orf Heat
(BTU/CU FT)
No. High/Low
860 — —
875 42 3.2/1.3
890 43 3.8/1.6
905 43 3.7/1.5
920 43 3.6/1.5
935 43 3.4/1.4
43 3.3/1.4
950
44 3.8/1.6
43 3.2/1.3
965
44 3.7/1.5
980 44 3.6/1.3
995 44 3.5/1.4
1010 44 3.4/1.4
1025 44 3.3/1.4
1040 44 3.1/1.3
1055 45 3.8/1.6
45 3.7/1.5
1070
46 3.8/1.6
45 3.6/1.5
1085
46 3.7/1.5
45 3.5/1.4
1100
46 3.6/1.5
* For size 060125 only, input is 20,500 for high fire. Deduct 0.1-in. wc from manifold pressure shown in table. Change orifice size if manifold pressure falls below 3.2-in.
wc.
(3.) Turn high-fire adjusting screw (5/64-in. hex Allen
wrench) counterclockwise (out) to decrease input rate
or clockwise (in) to increase rate. When adjusting
input rate, DO NOT set 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.
(4.) Remove R-to-W2 jumper on control to place furnace
in low-gas-heat operation for low-fire adjustment.
(5.) Turn low-fire adjusting screw (5/64-in. hex Allen
wrench) counterclockwise (out) to decrease input rate
or clockwise (in) to increase rate. When adjusting
input rate, DO NOT set 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.
NOTE: If orifices are changed, both high-fire and low-fire input
rates must be readjusted with manifold pressures within ranges
specified in items (3). and (5).
NOTE: If orifice hole appears damaged or is suspected to have
been redrilled, check the orifice size with a numbered drill bit of
the correct size. Never use a redrilled orifice. A burr-free and
squarely aligned orifice hole is essential for proper flame charac-
teristics.
SPECIFIC GRAVITY OF NATURAL GAS
0.60 0.62
Orf Heat Orf Heat
No. High/Low No. High/Low
3.2/1.3
42 3.5/1.4 42
3.6/1.5
42 3.3/1.4 42 3.4/14
42 3.2/1.3 43 3.3/1.4
43 3.8/1.6 43 3.2/1.3
43 3.7/1.5 43 3.8/1.6
43 3.6/1.5 43 3.7/1.5
43
43 3.5/1.4 3.6/1.5
44
43 3.3/1.4 43
3.5/1.4
44 3.8/1.6 44
43 3.2/1.3 43 3.4/1.4
44 3.7/1.5 44 3.8/1.6
3.3/1.3
44 3.6/1.5 44
3.7/1.5
3.2/1.3
44 3.5/1.4 44
3.6/1.5
44 3.4/1.4 44 3.5/1.4
44 3.3/1.4 44 3.4/1.4
44 3.2/1.3 44 3.3/1.4
45 3.8/1.6 44 3.2/1.3
45 3.7/1.5 45 3.8/1.6
45 3.6/1.8
45 3.7/1.5
46 3.8/1.6
0.64 0.66
Orf Heat Orf Heat
No. High/Low No. High/Low
40 3.2/1.3
41 3.3/1.4
41 3.4/1.4
42 3.7/1.5
42 3.8/1.6
41 3.2/1.3 41 33.3/1.4
42 3.6/1.5 42 3.7/1.5
41 3.2/1.3
42 3.4/1.5
42 3.5/1.5
42 3.3/1.4 42 3.4/1.4
42 3.2/1.3 42 3.3/1.4
43 3.8/1.6 42 3.2/1.3
43 3.7/1.5 43 3.8/1.6
43 3.6/1.5 43 3.7/1.5
43 3.5/1.4 43 3.6/1.5
43 3.4/1.4
43 3.5/1.4
44 3.8/1.6
43 3.3/1.3 43 3.4/1.4
44 3.7/1.5 44 3.8/1.6
43 3.2/1.3 43 3.3/1.3
44 3.6/1.5 44 3.7/1.5
43 3.2/1.3
44 3.5/1.4
44 3.6/1.5
44 3.4/1.4 44 3.5/1.5
44 3.3/1.4 44 3.4/1.4
44 3.2/1.3 44 3.3/1.4
45 3.8/1.6 44 3.2/1.3
(6.) Remove jumper on R-W/W1 after low-fire adjust-
ments.
(7.) When correct input is obtained, replace gas control
regulator adjustment caps. Main burner flame should
be clear blue, almost transparent. (See Fig. 17.)

2. Set temperature rise.

Place SW-2 in the ON position. Jumper R to W/W1 and W2
to check high-gas-heat temperature rise. To check low-gas-
heat temperature rise, remove jumper to W2. Determine air
temperature rise for both high and low fire using the following
steps. DO NOT exceed the temperature rise ranges specified
on the unit rating plate for high and low fire.
a. Place duct thermometers in return and supply ducts as near
furnace as possible. Be sure thermometers do not see heat
exchangers so that radiant heat will not affect thermometer
readings. This is particularly important with straight-run
ducts.
b. When thermometer readings stabilize, subtract return-air
temperature from supply-air temperature to determine tem-
perature rise.
NOTE: If the temperature rise is outside this range, first check:
(1.) Gas input for low- and high-fire operation.
15
0.68 0.70
Orf Heat Orf Heat
No. High/Low No. High/Low
40 3.3/1.3 40 3.3/1.4
41 3.5/1.5 41 3.6/1.5
41 3.4/1.4 40 3.2/1.3
42 3.8/1.6 41 3.5/1.4
41 3.3/1.4 41 3.4/1.4
42 3.7/1.5 42 3.8/1.6
41 3.2/1.3 41 3.3/1.4
42 3.5/1.4 42 3.6/1.5
41 3.2/1.3
42 3.4/1.4
42 3.5/1.5
42 3.3/1.3 42 3.4/1.4
42 3.2/1.3 42 3.3/1.4
43 3.8/1.5 42 3.2/1.3
43 3.7/1.5 43 3.8/1.6
43 3.6/1.4 43 3.7/1.5
43 3.5/1.4 43 3.6/1.5
43 3.4/1.4
43 3.5/1.4
44 3.8/1.5
43 3.3/1.3 43 3.4/1.4
44 3.7/1.5 44 3.8/1.6
43 3.2/1.3 43 3.3/1.4
44 3.6/1.5 44 3.4/1.5
43 3.2/1.3
44 3.5/1.5
44 3.6/1.5
44 3.4/1.4 44 3.5/1.5
44 3.3/1.4 44 3.4/1.4
0.72
Orf Heat
No. High/Low
39 3.2/1.3
40 3.4/1.4
41 3.7/1.5
40 3.3/1.4
41 3.6/1.5
40 3.2/1.3
41 3.5/1.4
41 3.4/1.4
42 3.7/1.5
41 3.3/1.3
42 3.6/1.5
41 3.2/1.3
42 3.5/1.4
42 3.4/1.4
42 3.3/1.4
42 3.2/1.3
43 3.8/1.6
43 3.7/1.5
43 3.6/1.5
43 3.5/1.4
43 3.4/1.4
44 3.8/1.6
43 3.3/1.4
44 3.7/1.5
43 3.2/1.3
44 3.6/1.5
44 3.5/1.5