Daikin MPS015 F Installation And Maintenance Manual page 30

Figure 27: Capacity of Pipe Natural Gas (CFH)
Pipe Length
(ft)
½
10 132
20 92
30 73
40 63
50 56
60 50
70 46
80 53
90 40
100 38
125 34
150 31
175 28
200 26
NOTE: Use multiplier below for other gravities and pressure drops.
Table 17: Specific Gravity Other Than 0.60
Specific Gravity
0 .50
0 .60
0 .70
0 .80
0 .90
1 .00
Propane-Air
1 .10
1 .55
2 .00
Table 18: Pressure Drop Other Than 0.3"
Pressure Drop Multiplier
0 .1 0 .577
0 .2 0 .815
0 .3 1 .000
0 .4 1 .16
0 .6 1 .42
0 .8 1 .64
IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS
With Pressure Drop of 0.3" W.C. & Specific Gravity of 0.60
¾ 1
278 520
190 350
152 285
130 245
115 215
105 195
96 180
90 170
84 160
79 150
72 130
64 120
59 110
55 100
Multiplier
1 .100
1 .000
0 .936
0 .867
0 .816
0 .775
0 .740
Propane
0 .622
Butane
0 .547
Pressure Multiplier
1 .0 1 .83
2 .0 2 .58
3 .0 3 .16
4 .0 3 .65
6 .0 4 .47
8 .0 5 .15
Pipe Size-inches (Ips)
1¼ 1½
1050 1600 2050
730 1100 2100
590 890 1650
500 760 1450
440 670 1270
400 610 1150
370 560 1050
350 530 990
320 490 930
305 460 870
275 410 780
250 380 710
225 350 650
210 320 610
Sequence of Operation (Staged Control)
Low Heat Option (2 Stage Control)
The following details the sequence of operation for the low
heat option.
1 . Unit DDC control calls for heat.
2 . Furnace DDC control module receives a call for heat.
3 . High limit switch is checked for safe condition.
4 . Proof of airflow switch is check for combustion airflow.
5 . 60 second prepurge cycle starts.
6 . Spark ignitor is activated for 3 seconds.
7 . Gas valve receives a command for stage 1 of heat.
8 . Burner is ignited.
9 . Unit DDC controller calls for stage 2 of heat.
10 . Furnace DDC controller receives a stage 2 heat command.
11 . Gas valve receives a command for stage 2 of heat.
High Heat Option (4 Stage Control)
For a unit with the optional high heat the above sequence is
followed for the first two stages.
For the remaining 2 stages the above procedure is repeated on
the second furnace module.
30
o
PTIonal
2 2½ 3
4800 8500
3300 5900
2700 4700
2300 4100
2000 3600
1850 3250
1700 3000
1600 2800
1500 2600
1400 2500
1250 2200
1130 2000
1050 1850
980 1700
www.DaikinApplied.com
G h
as eaT
4
17500
12000
9700
8300
7400
6800
6200
5800
5400
5100
4500
4100
3800
3500