13
Step 10 — Install Flue Hood
Flue hood is shipped screwed to the basepan beside the
burner compartment access panel. Remove from shipping
location and using screws provided, install flue hood and
screen in location shown in Fig. 14.
BLOWER
ACCESS
PANEL
C07081
Fig. 14 -- Flue Hood Details
Step 11 — Install Gas Piping
Installation of the gas piping must be accordance with
local building codes and with applicable national codes.
In U.S.A., refer to NFPA 54/ANSI Z223.1 National Fuel
Gas Code (NFGC). In Canada, installation must be
accordance with the CAN/CSA B149.1 and CAN/CSA
B149.2 installation codes for gas burning appliances.
This unit is factory equipped for use with Natural Gas fuel
at elevations up to 2000 ft (610 m) above sea level. Unit
may be field converted for operation at elevations above
2000 ft (610 m) and/or for use with liquefied petroleum
fuel. See accessory kit installation instructions regarding
these accessories.
NOTE: Furance gas input rate on rating plate is for
installation up to 2000 ft (610 m) above sea level. In U.S.A.
the input rating for altitudes above 2000 ft (610 m) must be
derated by 4% for each 1000 ft (305 m) above sea level. In
Canada the input rating must be derated by 10% for altitudes
of 2000 ft (610 m) to 4500 ft (1372 m) above sea level.
For natural gas applications, gas pressure at unit gas
connection must not be less than 4 in. wg (996 Pa) or greater
than 13 in. wg (3240 Pa) while the unit is operating. On
48LCF*04--06 (high--heat) units, the gas pressure at unit gas
connection must not be less than 5 in. wg (1245 Pa) or
greater than 13 in. wg (3240 Pa) while the unit is operating.
For liquified petroleum applications, the gas pressure must
not be less than 11 in. wg (2740 Pa) or greater than 13.6 in.
wg (3390 Pa) at the unit connection.
Table 2 – Natural Gas Supply Line Pressure Ranges
UNIT MODEL UNIT SIZE MIN MAX
48LC** 04, 05, 06
4.0 in. wg
(996 Pa)
13.0 in. wg
(3240 Pa)
48LCF*
(High Heat units only)
04, 05, 06
5.0 in. wg
(1245 Pa)
13.0 in. wg
(3240 Pa)
The gas supply pipe enters the unit at the burner access
panel on the front side of the unit, through the long slot at
the bottom of the access panel. The gas connection to the
unit is made to the
1
/
2
--in. FPT gas inlet port on the unit
gas valve
Manifold pressure is factory--adjusted for NG fuel use.
Adjust as required to obtain best flame characteristics.
Table 3 – Natural Gas Manifold Pressure Ranges
UNIT MODEL UN I T SIZE HIGH FIRE LOW FIRE
48LCD/E/L/M/S/R* 04, 05, 06
3.5 in. wg
(872 Pa)
1.7 in. Wg
(423 Pa)
48LCF/N/T*
(High Heat units only)
05. 06
3.5 in. wg
(872 Pa)
1.7 in. Wg
(498 Pa)
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in damage
to equipment.
When connecting the gas line to the unit gas valve,
the installer MUST use a backup wrench to prevent
damage to the valve.
CAUTION
!
Install a gas supply line that runs to the unit heating
section. Refer to the NFPA 54/NFGC or equivalent code
for gas pipe sizing data. Do not use a pipe size smaller
than
1
/
2
--in. Size the gas supply line to allow for a
maximum pressure drop of 0.5--in wg (124 Pa) between
gas regulator source and unit gas valve connection when
unit is operating at high--fire flow rate.
The gas supply line can approach the unit in three ways:
horizontally from outside the unit (across the roof),
thru--curb/under unit basepan (accessory kit required) or
through unit basepan (factory--option or accessory kit
required). Consult accessory kit installation instructions
for details on these installation methods. Observe
clearance to gas line components per Fig. 15.
LEGEND
*
Field supplied.
NOTE: Follow all local codes.
NFGC – National Fuel Gas Code
STEEL PIPE
NOMINAL DIAMETER
(in.)
SPACINGOFSUPPORTS
X DIMENSION
(ft)
1
/
2
3
/
4
or 1
1
1
/
4
or larger
6
8
10
X
BASE UNIT
BASE RAIL
ROOF
CURB
9” MINIMUM CLEARANCE
FOR PANEL REMOVAL
MANUAL GAS
SHUTOFF VALVE
*
GAS
REGULATOR
*
48” MINIMUM
DRIP LEG
PER NFGC
*
FIELD-FABRICATED
SUPPORT
*
FROM
GAS
METER
C11091
Fig. 15 -- Gas Piping Guide
(with Accessory Thru--the--Curb Service Connections)
48HC48LC
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