Combustion Discharge; Gas Piping; Gas Connection; L.p. Units, Tanks And Piping - York D2CG180 & 240 (STY. B) Installation Instructions Manual

530.18-N6Y
TABLE 3 - GAS HEAT APPLICATION DATA
Input Capacity (Mbh) Output Capacity (Mbh)
0 To 2,000 To 0 To
2,000 Feet 4,500 Feet 2,000 Feet
Above Above Above
1
Sea Level Sea Level Sea Level
Max. Min. Max. Min. Max.
300 150 270 135 240
400 200 360 180 320
NOTE: Heaters are shipped available for natural gas, but can be converted to
L.P . / Propane with Kit Model No. 1NP0418.
1
MBH rating should be reduced at the rate of 4 percent for each 1,000 feet above 4,500 feet.
2
Based on maximum input and 1075 Btu/Ft
3
The air flow must be adjusted to obtain a temperature rise within the range shown.

COMBUSTION DISCHARGE

The products of combustion are discharged horizontally
through two screened (hooded) openings on the upper gas
heat access panel.

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 CAN/CGA-B149.1 and .2 (in Canada) should
be followed in all cases unless superseded by local codes or gas
utility requirements. Refer to the Pipe Sizing table.
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 4 - PIPE SIZING
Length in Feet
10
20
30
40
50
60
70
80
90
100
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).
FIG. 6 - EXTERNAL SUPPLY CONNECTION
EXTERNAL SHUT-OFF

GAS CONNECTION

The gas supply line can be routed through the knockouts located on
the front of the unit or through the opening provided in the unit's base.
Refer to the Dimensions and Clearances figure to locate these access
openings. Typical supply piping arrangements are shown in the
figures on this page. 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
6
2,000 To
Gas
4,500 Feet Available
2
Rate
Above on Models
Full Input
3
(Ft. /Hr.)
1
Sea Level
Max. Min.
213 15 & 20 Ton 279 20
281 15 & 20 Ton 372 30
3
.
Nominal Iron Pipe Size
1 in. 1-1/4 in.
520 1,050
350 730
285 590
245 500
215 440
195 400
180 370
170 350
160 320
150 305
lie below the bottom gas manifold to avoid interference with the
burner assembly.
Two grommets are shipped in the blower compartment (in parts
Temp.
Rise °F
bag taped to the blower housing) of every unit with gas heat
At
and should be used in the knockouts when the gas piping
3
penetrates the front of the unit.
After the gas supply piping has been installed, the bottom
Max.
opening in the unit should be sealed to prevent water from
50
leaking into the building.
60
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.
WARNING: Natural gas may contain some propane. Propane,
being an excellent solvent, will quickly dissolve
white lead or most standard commercial
compounds. Therefore, a special pipe compound
must be applied when wrought iron or steel pipe is
used. Shellac base compounds such as Gaskolac
or Stalastic, and compounds such as Rectorseal
#5, Cyde's or John Crane may be used.
4. All piping should be cleaned of dirt and scale by hammering
on the outside of the pipe and blowing out the loose dirt and
scale. Before initial start-up, be sure that all of the gas lines
external to the unit have been purged of air.
5. The gas supply should be a separate line and installed in
accordance with all safety codes as prescribed under
"Limitations". After the gas connections have been
completed, open the main shut-off valve admitting normal
gas pressure to the mains. Check all joints for leaks with
soap solution or other material suitable for the purpose.
NEVER USE A FLAME.
6. The furnace and its individual manual shut-off valve must
be disconnected from the gas supply piping system during
any pressure testing of that system at test pressures in
excess of 1/2 psig (3.48kPa).
The furnace must be isolated from the gas supply piping
system by closing its individual manual shut-off valve during
any pressure testing of the gas supply piping system at test
pressures equal to or less than 1/2 psig (3.48kPa).
7. A 1/8 inch NPT plugged tapping, accessible for test gage
connection, must be installed immediately upstream of the
gas supply connection to the furnace.
FIG. 7 - BOTTOM SUPPLY CONNECTION
EXTERNAL SHUT-OFF

L.P. UNITS, TANKS AND PIPING

All gas heat units are shipped from the factory equipped for
natural gas use only. The unit may be converted in the field for
use with L.P ./propane gas with accessory kit model number
1NP0418.
Unitary Products Group