Unit Startup
166
RT-SVX24J-EN
for the required manifold pressure during low-fire
operation. If it needs adjusting, remove the cap
covering the low-fire adjustment screw on the gas
valve. Refer to
Figure 118, p. 167
for the adjustment
screw location. Turn the screw clockwise to increase
the gas pressure or counterclockwise to decrease the
gas pressure.
Note:
Do not adjust the combustion air damper while
the furnace is operating at low-fire.
4. Check the carbon dioxide levels after each adjustment.
5. Press the STOP key at the Human Interface Module in
the unit control panel to stop the system operation.
Figure 116. Natural gas combustion curve (ratio of oxygen to carbon dioxide in percent)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
0 1 2 3 4 5
6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
Percent Oxygen
Percent Carbon Dioxide
Curve Fuel
A = 1,000 BTU per cu. ft.
of Natural Gas.
A
Table 48. Recommended manifold pressures and CO
2
levels during furnace operation
2-STAGE
MODULATING
MBH
FIRING
RATES
% CO2
NAT GAS
MANIF
PRESS
“W.C.
% CO2
PROPANE
MANIF
PRESS
“W.C.
MBH
FIRING
RATE
% CO2
NAT GAS
MANIF
PRESS
“W.C.
% CO2
PROPANE
MANIF
PRESS
“W.C.
850
100%
8.0-9.0
3.0-3.5
9.0-10.0
3.0-3.5
850
100%
8.0-9.0
3.0- 3.5
7.8-8.4
1.7-2.2
510
60%
5.0 -7.0
0.8-0.95
5.0-7.0
1.5-3.0
85
10%
5.0 -7.0
0.8- 0.9.5
2.0-3.0
.1-.2
1100
100%
8.0-9.0
3.0-3.3
9.0-10.0
3.0-3.3
1100
100%
7.0-9.0
.8-.9
8.5-9.5
.5-.75
550
50%
5.0 -7.0
0.8-0.95
5.0-7.0
0.8-0.95
55
5%
1.5-3.0
.05-1.0
1.5-2.5
.02-.04
1800
100%
7.0- 8.0
1.5- 1.8
N/A
N/A
1800
100%
7.0-9.0
1.5- 1.8
N/A
N/A
900
50%
5.0- 7.0
0.5- 0.7
N/A
N/A
90
5%
1.5-3.0
.05-1.0
N/A
N/A
2500
100%
7.5- 8.5
2.0- 2.5
N/A
N/A
2500
100%
7.0-9.0
2.0- 2.5
N/A
N/A
1250
50%
5.0- 7.0
0.5- 0.7
N/A
N/A
125
5%
1.5-3.0
.05-1.0
N/A
N/A
Содержание SEHJ090-162
Страница 40: ...Dimensional Data 40 RT SVX24J EN Figure 13 Evaporative condenser water connection locations RIGHT SIDE VIEW ...
Страница 48: ...Installation 48 RT SVX24J EN Figure 18 Ductwork conversion ...
Страница 58: ...Installation 58 RT SVX24J EN Figure 36 5 Connected tubes 6 install panels Connected tubes 5 6 ...
Страница 75: ...Installation RT SVX24J EN 75 Figure 51 Hot water coil piping Figure 52 Steam coil piping ...
Страница 87: ...Installation RT SVX24J EN 87 Figure 57 Typical field wiring diagram for 90 to 162 ton CV control options ...
Страница 89: ...Installation RT SVX24J EN 89 Figure 59 Typical field wiring diagram for 90 to 162 ton VAV control options ...