Table of Contents
Advertisement
Manifold pressure for liquid propane (LP) fuel must be
adjusted to specified range. Follow instructions in the
accessory kit to make initial readjustment.
Table 6 – Liquid Propane Manifold Pressure Ranges
UNIT MODEL
UNIT SIZE
48LC**
14, 17, 20, 24, 26
48LCS*
14 only
CAUTION
!
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.
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 smaller than the
size specified. 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 two ways:
horizontally from outside the unit (across the roof), or
through unit basepan. Observe clearance to gas line
components per Fig. 20.
9" MINIMUM CLEARANCE
FOR PANEL REMOVAL
MANUAL GAS
SHUTOFF VALVE
BASE UNIT
48" MINIMUM
BASE RAIL
ROOF
CURB
NFGC – National Fuel Gas Code
*
Field supplied.
NOTE: Follow all local codes.
STEEL PIPE
NOMINAL DIAMETER
(in.)
1
/
2
3
/
or 1
4
1
/
1
or larger
4
Fig. 20 - - Gas Piping Guide
Factory- - Option Thru- - Base Connections —
Electrical Connections: Knockouts are located in the
control box area. Remove the appropriate size knockout
for high voltage connection. Use the field supplied
connector depending on wiring or conduit being utilized.
7
Remove the
/
- - in. (22mm) knockout and appropriate
8
HIGH FIRE
LOW FIRE
11.0 in. wg
7.3 in. Wg
(2740 Pa)
(1818 Pa)
9.8 in. wg
6.5 in. Wg
(2441 Pa)
(1619 Pa)
X
GAS
FROM
*
REGULATOR
GAS
METER
*
DRIP LEG
*
PER NFGC
FIELD-
FABRICATED
*
SUPPORT
LEGEND
SPACING OF SUPPORTS
X DIMENSION
(ft)
6
8
10
C11121
connector for low voltage wiring. If non- - unit powered
convenience outlet is being utilized, remove the
(22mm) knockout and utilize appropriate connector for
115 volt line. See "Step 12 — Make Electrical
Connections" for details.
Gas Connections: Remove the knockout in the base pan
3
and route
/
- - in. gas line up through the opening. Install an
4
elbow and route gas line through opening in panel after first
removing plastic bushing. Install a gas shut off followed by a
drip leg and ground- - joint union. Route gas line into gas
section through the grommet (Part #: KA56SL112) at the gas
inlet and into the gas valve. See Fig. 18 and Table 2. If a
regulator is installed, it must be located 4 feet (1.22 meters)
from the flue outlet.
Some municipal codes require that the manual shutoff
valve be located upstream of the sediment trap. See
Fig. 19 for typical piping arrangements for gas piping that
has been routed through the sidewall of the base pan.
When installing the gas supply line, observe local codes
pertaining to gas pipe installations. Refer to the NFPA
54/ANSI Z223.1 NFGC latest edition (in Canada,
CAN/CSA B149.1). In the absence of local building codes,
adhere to the following pertinent recommendations:
1. Avoid low spots in long runs of pipe. Grade all pipe
1
/
- - in. in every 15 ft (7 mm in every 5 m) to prevent
4
traps. Grade all horizontal runs downward to risers.
Use risers to connect to heating section and to meter.
2. Protect all segments of piping system against physical
and thermal damage. Support all piping with appro-
priate straps, hangers, etc. Use a minimum of one
hanger every 6 ft (1.8 m). For pipe sizes larger than
1
/
- - in., follow recommendations of national codes.
2
3. Apply joint compound (pipe dope) sparingly and only
to male threads of joint when making pipe
connections. Use only pipe dope that is resistant to
action of liquefied petroleum gases as specified by
local and/or national codes. If using PTFE (Teflon*)
tape, ensure the material is Double Density type and
is labeled for use on gas lines. Apply tape per
manufacturer's instructions.
4. Pressure- - test all gas piping in accordance with local
and national plumbing and gas codes before connect-
ing piping to unit.
NOTE: Pressure test the gas supply system after the gas
supply piping is connected to the gas valve. The supply
piping must be disconnected from the gas valve during the
testing of the piping systems when test pressure is in
excess of 0.5 psig (3450 Pa). Pressure test the gas supply
piping system at pressures equal to or less than 0.5 psig
(3450 Pa). The unit heating section must be isolated from
the gas piping system by closing the external main manual
shutoff valve and slightly opening the ground- - joint union.
Check for
gas leaks
factory- - installed gas lines after all piping connections
have been completed. Use soap- - and- - water solution (or
method specified by local codes and/or regulations).
* Teflon is a registered trademark of DuPont.
24
7
/
8
at
the
field- - installed and
- - in.
Advertisement
Table of Contents
