Specifications

2
Table 1 – Burner Orifice Sizes
UNIT SIZE
48PG, 48PD
GAS HEAT
TYPE
(UNIT CODE)
ORIFICE
DRILL SIZE*
MANIFOLD
PRESSURE
(in. wg)
ADJUSTED
LP HEATING
INPUT (Btuh)
03
High (F) No. 52, 0.065 in. 3.5 55,000
04, 05
Low (D) No. 52, 0.065 in. 3.5 55,000
Medium (E) No. 52, 0.065 in. 3.5 74,000
High (F) No. 52, 0.065 in. 3.5 111,000
06, 07
Low (D) No. 52, 0.065 in. 3.5 74,000
Medium (E) No. 52, 0.065 in. 3.5 111,000
High (F) No. 52, 0.065 in. 3.5 148,000
08, 09
Low (D) No. 50, 0.070 in. 3.5 130,000
Medium (E) No. 50, 0.070 in. 3.5 174,000
High (F) No. 50, 0.070 in. 3.5 217,000
12, 14
Low (D) No. 50, 0.070 in. 3.5 174,000
Medium (E) No. 50, 0.070 in. 3.5 217,000
High (F) No. 50, 0.070 in. 3.5 239,000
CONTROL BOX
AND
COMPRESSOR
OUTDOOR AIR
SCREEN
(HIDDEN)
FILTER ACCESS DOOR
GAS SECTION
ACCESS
INDOOR MOTOR
ACCESS DOOR
ELECTRICAL
OPTIONS PANEL
BASEPAN CONNECTIONS
ACCESS PANEL
CONDENSER COIL
ACCESS PANEL
C07002
Fig. 1 -- Panel and Filter Locations (48PG03--07 Unit Shown)
INSTALLATION
Step 1 — Remove Gas Manifold Pipe
1. Close the manual shutoff valve on the gas supply piping.
2. Open gas section access door. (See Fig. 1.)
3. Set the switch on the main gas valve to the OFF position.
(See Fig. 2.)
4. Shut off power to unit and install lockout tag.
5. Disconnect gas piping at unit gas valve.
NOTE: Use a backup wrench to avoid twisting the gas
manifold pipe.
6. Remove wires connected to gas valve. Mark each wire to
ensure proper reassembly.
7. Remove wires connected to the flame rollout switch. Mark
wires.
8. Remove wires connected to igniter and flame sensor. Mark
wires.
9. Remove the four screws that attach the gas manifold pipe to
the burner bracket and rotate the pipe away from the unit.
The pipe should NOT be removed from the wire bundle
connecting to the IGC board. (See Fig. 3.)
Step 2 — Replace Orifice Fittings
1. Remove standard orifice fittings from the manifold pipe.
Save orifices for possible conversion back to natural gas at a
later date.
2. Select the correct LP orifice fittings from the LP Conversion
Kit. For standard elevations refer to Table 1. For
elevations above 2000 ft refer to Table 2. Extra orifices are
included in the accessory for elevations up to 7000 ft. For
elevations above 7000 ft, refer to Table 2 and purchase the
correct orifices required.
3. Install new orifice fittings.
NOTE: Pipe sealant is not required. Never use Teflon tape
on fitting threads since loose pieces may plug gas orifices.