York PHG6A24 Installation Manual page 11

Table 8: Propane (LP) Gas Pipe Sizing Chart
Nominal Inches Iron Pipe Size
Length
In Feet
1/2"
10 275
20 189
30 152
40 129
50 114
60 103
70 96
80 89
90 83
100 78
1. Maximum capacity of pipe in thousands of BTU per hour (based upon a
pressure drop of 0.5 inch water column).
CAUTION
!
If flexible stainless steel tubing is allowed by the authority having
jurisdiction, wrought iron or steel pipe must be installed at the gas
valve and extend a minimum of two (2) inches outside of the unit cas-
ing.
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 thread sealant must be
applied when wrought iron or steel pipe is used. Shellac base com-
pounds such as gaskoloc or stalastic, and compounds such as Rec-
torseal # 5, Clyde's or John Crane may be used.
Table 9: High Altitude Gas Orifice Sizing
GAS TYPE 0-2000 (FACTORY)
36
NATURAL GAS
ORIFICE SIZES
42
54
LP GAS
ORIFICE SIZES
51
FLUE VENT AND AIR INTAKE HOOD
The flue vent hood and air intake hoods are shipped loose. These hoods
must be installed to assure proper unit operation. The hoods must be fas-
tened to the outside of the side gas control/electrical compartment with
the screws provided. See Figure 8.
WARNING
!
Flue hood surfaces may be hot.
CAUTION
!
The flue exhaust hood must be properly installed and within the rec-
ommended clearances. Further communications and action must be
given to the home or building owner(s) to eliminate any unauthorized
human contact around this area during the heating cycle. Flue hood
surfaces and the immediate area reach high temperatures during the
heating cycle.
Johnson Controls Unitary Products
1
3/4" 1" 1-1/4"
567 1071 2,205
393 732 1496
315 590 1212
267 504 1039
237 448 913
217 409 834
196 378 771
185 346 724
173 322 677
162 307 630
ELEVATION ABOVE SEA LEVEL (FEET)
2001-3000 3001-4000 4001-5000 5001-6000 6001-7000 7001-8000 8001-9000 9001-10000
37 38
42 43
54 55
51 52
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 accor-
dance with all applicable safety codes. After the gas connections
have been completed, open the main shut-off valve admitting nor-
mal gas pressure to the gas valve. Check all joints for leaks with
soap solution or other material suitable for the purpose. NEVER
USE AN OPEN FLAME.
WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warning exactly could result in serious
injury, death or property damage.
Never test for gas leaks with an open flame. use a commercially
available soap solution made specifically for the detection of leaks to
check all connections. A fire or explosion may result causing property
damage, personal injury or loss of life.
6. The furnace and its equipment shutoff valve must be disconnected
from the gas supply system during and pressure testing of that sys-
tem at test pressures in excess of 1/2 psi (3.48 kPA)
7. The furnace must be isolated from the gas supply piping system by
closing its individual manual shut-off valve before conducting any
pressure testing of the gas supply piping system at test pressures
equal to or less than 1/2 psig (3.48 kPa).
HIGH ALITITUDE GAS CONVERSION
This furnace is constructed at the factory for natural gas-fired operation
at altitudes up to 2,000 feet above sea level. For installations located
above 2,000 feet, the gas input rate to the burners must be reduced by
4% per 1,000 feet above sea level. It may be necessary to change to
smaller orifices at high altitude. Refer to the table below for the correct
orifice size to use.
38 39 40
43 43 44
55 55 55
52 52 52
FIGURE 8: Flue Vent Outlet Air Hood
5322625-UIM-A-0417
41 41 42
44 45 46
55 56 56
53 53 53
AIR INTAKE HOOD
AIR INTAKE SCREEN
EXHAUST HOOD
A0284-001
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