Electrical
Improper installation, adjustment, alteration, service or maintenance
can cause property damage, severe personal injury or death. Read the
installation, operating and maintenance instructions thoroughly before
installing or servicing this equipment.
If you smell gas:
1. Open Windows and ventilate area thoroughly.
2. Don't touch electrical switches.
3. Eliminate open flames, pilot lights, arcing or sparking
equipment, or other sources of ignition.
4. Evacuate the area.
5. Immediately call your gas supplier from a different area.
Do not use and store gasoline or other flammable vapors or liquids in open
containers near this appliance or in areas sharing ventilation with it..
The Daikin burner receives its electrical power from the main
unit control panel . No additional power wiring must be routed
to the burner . The sequencing of the burner is also controlled
through this panel and therefore is factory wired . No additional
wiring will be required . Note that Models 150 through 200
furnaces require reassembly of some electrical connections as
the burner is removed for shipment .
IM 684-6 • ROOFTOP SYSTEMS
WARNING
Gas Pressure Requirements
The pressure furnished to the appliance gas pressure regulator
immediately before the main gas valve must not exceed 13 .9
in. W.C. or be below the minimum specified in
page
36, Column 14 . When the supply pressure is above
13 .9 in . W .C ., a high pressure regulator must precede the
appliance gas pressure regulator . The inlet gas pressure
must not exceed the maximum pressure rating of the high
pressure regulator, and the outlet pressure must furnish gas
to the appliance pressure regulator within the pressure range
mentioned above .
Gas Piping
The connection size at the burner is shown in
columns 17 and 18 . Gas piping must be sized to provide the
minimum required pressure at the burner when the burner is
operating at maximum input . Consult your local utility on any
questions on gas pressure available, allowing piping pressure
drops, and local piping requirements .
Install all piping in accordance with the National Fuel Gas Code
(ANSI Z223 .1), (NFPA 54-1999) and any applicable local codes .
The proper size piping must be run from the meter to the
gas burner without reductions . Undersized piping will result
in inadequate pressure at the burner . The pressure will be at
its lowest when it is needed the most, at times of maximum
demand. Therefore, it can cause intermittent hard-to-find
problems because the problem may have left before the
service technician has arrived . Avoid the use of bushings
wherever possible .
Table 2: Capacity of Pipe Natural Gas (CFH)
WITH PRESSURE DROP OF 0 .3" W .C . & SPECIFIC GRAVITY OF 0 .60
PIPE
LENGTH
PIPE SIZE-INCHES (IPS)
(FT .)
½
¾
1
10
132
278
520
20
92
190
350
30
73
152
285
40
63
130
245
50
56
115
215
60
50
105
195
70
46
96
180
80
53
90
170
90
40
84
160
100
38
79
150
125
34
72
130
150
31
64
120
175
28
59
110
200
26
55
100
NOTE: Use multipliers in Tables 2 and 3 for other gravities and pressure drops .
6
Installation
Table 10 on
Table 10
1¼
1½
2
2½
3
1050 1600
2050
4800
8500
730
1100
2100
3300
5900
590
890
1650
2700
4700
500
760
1450
2300
4100
440
670
1270
2000
3600
400
610
1150
1850
3250
370
560
1050
1700
3000
350
530
990
1600
2800
320
490
930
1500
2600
305
460
870
1400
2500
275
410
780
1250
2200
250
380
710
1130
2000
225
350
650
1050
1850
210
320
610
980
1700
www .DaikinApplied .com
under
4
17500
12000
9700
8300
7400
6800
6200
5800
5400
5100
4500
4100
3800
3500
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