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

Table 8—Model 58UXT Orifice Size and Manifold Pressure for Correct Input Rate
(Tabulated Data Based on Altitude Up to 2000 ft and 20,000 Btuh High Heat/13,000 Btuh Low Heat Per Burner)*
GAS HEAT
0.58
VALUE
Orf Heat
(BTU/CU FT)
No. High/Low
860 43 3.7/1.6
875 43 3.6/1.5
890 43 3.5/1.5
43 3.3/1.3
905
44 3.7/1.5
43 3.2/1.3
920
44 3.7/1.5
935 44 3.6/1.5
950 44 3.5/1.5
965 44 3.4/1.4
980 44 3.3/1.4
44 3.2/1.3
995
45 3.8/1.6
1010 45 3.7/1.6
45 3.6/1.5
1025
46 3.8/1.6
45 3.5/1.5
1040
46 3.7/1.6
45 3.4/1.4
1055
46 3.6/1.5
45 3.3/1.4
1070
46 3.5/1.5
45 3.2/1.4
1085 46 3.4/1.4
47 3.8/1.6
46 3.3/1.4
1100
47 3.7/1.6
DO NOT redrill burner orifices. Improper drilling (burrs, out-
of- round, etc.) can cause excessive burner operating noise
and misdirection of burner flames. This could result in flame
impingement on burners and heat exchanger surfaces, leading
to potential failures.
c. Adjust gas manifold pressure
(1.) Move SW-2 to the ON position to lock out the
adaptive algorithm. (See Fig. 13 and 14.) Jumper R to
W/W1 and W2 to call for high-gas heat.
(2.) Remove gas control regulator adjustment seal caps.
(See Fig. 16.)
(3.) Turn high-stage 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 to place furnace in low-stage
operation for low-stage adjustment.
(5.) Turn low-stage adjusting screw (5/64-in. hex Allen
wrench) counterclockwise (out) to decrease input rate
SPECIFIC GRAVITY OF NATURAL GAS
0.60 0.62
Orf Heat Orf Heat
No. High/Low No. High/Low
43 3.8/1.6 42 3.2/1.4
43 3.7/1.6 43 3.8/1.6
43 3.6/1.5 43 3.7/1.6
43 3.5/1.4 43 3.6/1.5
43 3.3/1.4
43 3.5/1.4
44 3.8/1.6
43 3.2/1.4 43 3.3/1.4
44 3.7/1.6 44 3.8/1.6
43 3.2/1.4
44 3.6/1.5
44 3.7/1.6
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
44 3.2/1.3
44 3.3/1.4
45 3.8/1.6
45 3.7/1.6 44 3.2/1.3
45 3.6/1.5
45 3.7/1.6
46 3.8/1.6
45 3.5/1.5 45 3.6/1.5
46 3.7/1.6 46 3.8/1.6
45 3.4/1.4 45 3.5/1.5
46 3.6/1.5 46 3.7/1.6
45 3.3/1.4 45 3.4/1.5
46 3.5/1.5 46 3.6/1.5
45 3.2/1.4 45 3.4/1.4
46 3.4/1.4 46 3.5/1.5
0.64 0.66
Orf Heat Orf Heat
No. High/Low No. High/Low
42 3.3/1.4 42 3.4/1.5
42 3.2/1.4 42 3.3/1.4
43 3.8/1.6 42 3.2/1.4
43 3.7/1.5 43 3.8/1.6
43 3.6/1.5 43 3.7/1.5
43 3.5/1.5 43 3.6/1.5
43 3.3/1.4
43 3.4/1.5
44 3.8/1.6
43 3.2/1.4 43 3.3/1.4
44 3.7/1.6 44 3.8/1.6
43 3.2/1.4
44 3.6/1.5
44 3.7/1.6
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
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
46 3.8/1.6
45 3.6/1.5
45 3.7/1.5
46 3.7/1.6
45 3.5/1.5 45 3.6/1.5
46 3.6/1.5 46 3.8/1.6
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-stage and low-stage
input rates must be readjusted, with manifold pressures within
ranges specified in items (3.) and (5.).
NOTE: If orifice hole appears damaged or it 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.
(6.) Remove jumper on R-W/W1 after low-stage adjust-
ments.
(7.) When correct input is obtained, replace regulator seal
caps. Main burner flame should be clear blue, almost
transparent. (See Fig. 17.)

2. Set temperature rise.

Place SW-2 in 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 tem-
perature rise for both high- and low-stages. Do not exceed the
temperature rise ranges specified on the unit rating plate for
high and low stage.
16
0.68 0.70
Orf Heat Orf Heat
No. High/Low No. High/Low
41 3.2/1.4 41 3.3/1.4
42 3.6/1.5 42 3.7/1.5
41 3.2/1.3
42 3.4/1.4
42 3.5/1.5
42 3.3/1.4 42 3.4/1.4
42 3.2/1.4 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 3.6/1.5 43 3.7/1.5
43 3.4/1.5 43 3.5/1.5
43 3.3/1.4
43 3.4/1.5
44 3.8/1.6
43 3.2/1.4 43 3.3/1.4
44 3.7/1.6 44 3.8/1.6
43 3.2/1.4
44 3.6/1.5
44 3.7/1.6
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
44 3.2/1.4 44 3.3/1.4
45 3.8/1.6 44 3.2/1.4
45 3.7/1.6 45 3.8/1.6
0.72
Orf Heat
No. High/Low
41 3.4/1.4
42 3.8/1.6
41 3.3/1.4
42 3.6/1.5
41 3.2/1.3
42 3.5/1.5
42 3.4/1.4
42 3.3/1.3
42 3.2/1.3
43 3.8/1.6
43 3.6/1.5
43 3.5/1.5
43 3.4/1.4
43 3.3/1.4
44 3.8/1.6
43 3.2/1.4
44 3.7/1.6
44 3.6/1.5
44 3.5/1.5
44 3.4/1.4
44 3.3/1.4
44 3.2/1.4