Installation
RT-SVX35H-EN
35
Note:
Gas pressure in excess of 14" w.c. or 0.5 psig will
damage the gas train.
Failure to use a pressure regulating device will result in
incorrect gas pressure. This can cause erratic operation
due to gas pressure fluctuations as well as damage the gas
valve. Over sizing the regulator will cause irregular
pulsating flame patterns, burner rumble, potential flame
outages, and possible gas valve damage.
If a single pressure regulator serves more than one rooftop
unit, it must be sized to ensure that the inlet gas pressure
does not fall below 7" w.c. with all the furnaces operating
at full capacity. The gas pressure must not exceed 14" w.c.
when the furnaces are off.
7. Provide adequate support for all field installed gas
piping to avoid stressing the gas train and controls.
8. Leak test the gas supply line using a soap-and-water
solution or equivalent before connecting it to the gas
train.
9. Check the supply pressure before connecting it to the
unit to prevent possible gas valve damage and the
unsafe operating conditions that will result.
Note:
Do not rely on the gas train shutoff valves to isolate
the unit while conducting gas pressure/leak test.
These valves are not designed to withstand
pressures in excess of 14" w.c. or 0.5 psig.
WARNING
Hazard of Explosion!
Never use an open flame to detect gas leaks. It could
result in an explosion. Use a leak test solution for leak
testing. Failure to follow recommended safe leak test
procedures could result in death or serious injury or
equipment or property-only-damage.
Table 6.
Sizing natural gas pipe mains & branches
Gas Supply Pipe
Run (ft)
Gas Input (Cubic Feet/Hour)
(a)
1-1/4” Pipe
1-1/2” Pipe
2” Pipe
2-1/2” Pipe
3” Pipe
4” Pipe
10
1050
1600
3050
4800
8500
17500
20
730
1100
2100
3300
5900
12000
30
590
890
1650
2700
4700
9700
40
500
760
1450
2300
4100
8300
50
440
670
1270
2000
3600
7400
60
400
610
1150
1850
3250
6800
70
370
560
1050
1700
3000
6200
80
350
530
990
1600
2800
5800
90
320
490
930
1500
2600
5400
100
305
460
870
1400
2500
5100
125
275
410
780
1250
2200
4500
150
250
380
710
1130
2000
4100
175
225
350
650
1050
1850
3800
200
210
320
610
980
1700
3500
Notes:
1.
If more than one unit is served by the same main gas supply, consider the total gas input (cubic feet/hr.) and the total length when determining the
appropriate gas pipe size.
2.
Obtain the Specific Gravity and BTU/Cu.Ft. from the gas company.
3.
The following example demonstrates the considerations necessary when determining the actual pipe size.
Example: A 40' pipe run is needed to connect a unit with a 500 MBH furnace to a natural gas supply having a rating of 1,000
BTU/Cu.Ft. and a specific gravity of 0.60
Cu.Ft/Hour = Furnace MBH Input
Gas BTU/Cu.Ft. X Multiplier (
Table 6, p. 30
)
Cu.Ft/Hour = 500
Table 6, p. 30
indicates that a 1-1/4" pipe is required.
(a) Table is based on a specific gravity of 0.60. Use Table 3-1 for the specific gravity of the local gas supply.
Summary of Contents for IntelliPak WEHE Series
Page 15: ...General Information RT SVX35H EN 15 Figure 1 Unit component layout and ship with locations...
Page 17: ...Installation RT SVX35H EN 17 Figure 2 Typical control module location...
Page 44: ...Installation 44 RT SVX35H EN Figure 27 Typical field power wiring for W_HE casings 2 through 6...
Page 56: ...Installation 56 RT SVX35H EN Figure 32 Wiring notes for CV controls...
Page 60: ...Installation 60 RT SVX35H EN Figure 35 Wiring notes VAV...
Page 68: ...System Start up 68 RT SVX35H EN Figure 38 Typical fenwall ignition control system...
Page 69: ...System Start up RT SVX35H EN 69 Figure 39 Typical Fenwall ignition control system...
