Sunlife Enterprises DM180 Optional Gas Heat, Gas Heat Application Data, Gas Piping, Pipe Sizing

356214-XIM-A-0108

OPTIONAL GAS HEAT

These gas-fired heaters have aluminized-steel or optional stainless steel, tubular heat exchangers with spark ignition with proven pilot.

TABLE 4: GAS HEAT APPLICATION DATA

All gas heaters are shipped from the factory equipped for natural gas use, but can be field converted to L.P./ Propane with Kit Model # 1NP0418. See Gas Heat Application Data Table.

0 To		2,000 To		Output Capacity (Mbh)				Temp.
2,000 Feet		4,500 Feet		0 To	2,000 To		Gas	Rise ºF
				2,000 Feet	4,500 Feet	Available
Above		Above					Rate		At
				Above	Above	on Models
Sea Level		Sea Level					(Ft./Hr.)	Full Input
				Sea Level	Sea Level
Max.	Min.	Max.	Min.	Max.	Max.			Min.		Max.
300	150	270	135	240	213	15, 20 & 25 Ton	279	20		50
350	175	320	160	280	241	25 Ton	326	30		60

GAS PIPING

Proper sizing of gas piping depends on the cubic feet per hour of gas flow required, specific gravity of the gas and the length of run. "National Fuel Gas Code" Z223.1 (in U.S.A.) or the current Gas Installation Codes CSA- B149.1 (in Canada) should be followed in all cases unless superseded by local codes or gas utility require- ments. Refer to the Pipe Sizing Table 5.

The heating value of the gas may differ with locality. The value should be checked with the local gas utility.

NOTE: There may be a local gas utility requirement specifying a minimum diameter for gas piping. All units require a one-inch pipe connection at the entrance fitting.

TABLE 5: PIPE SIZING

Length in Feet	Nominal Iron Pipe Size
	1 in.	1-1/4 in.
10	520	1,050
20	350	730
30	285	590
40	245	500
50	215	440
60	195	400
70	180	370
80	170	350
90	160	320
100	150	305

Maximum capacity of pipe in cubic feet of gas per hour. (Based upon a pressure drop of 0.3 inch water column and 0.6 specific gravity gas).

GAS CONNECTION

The gas supply line can be routed through the knock- outs located on the front of the unit or through the opening provided in the unit's base. Refer to the Dimensions and Clearances Figure 13 to locate these access openings. Typical supply piping arrangements are shown in the figures on page 15. All shaded items are field-supplied.

If gas supply line is routed through the unit's base ensure that the burner assembly can be removed for maintenance without disturbing the supply line. The supply piping and fittings must lie below the bottom gas manifold to avoid interference with the burner assem- bly.

Two grommets are shipped in the blower compartment (in parts bag taped to the blower housing) of every unit with gas heat and should be used in the knockouts when the gas piping penetrates the front of the unit.

After the gas supply piping has been installed, the bot- tom opening in the unit should be sealed to prevent water from leaking into the building.

Gas piping recommendations:

1.A drip leg and a ground joint union must be installed in the gas piping.

2.When required by local codes, a manual shut-off valve may have to be installed outside of the unit.

3.Use wrought iron or steel pipe for all gas lines. Pipe compound should be applied sparingly to male threads only.

14 Johnson Controls Unitary Products