Carrier | 48HG014-028 | Specifications | Carrier 48HG014-028 Specifications

48HG014-028
Single-Packaged Large Rooftop Units
Accessory LP (Liquid Propane) Gas Conversion Kit
60 Hz
Installation Instructions
Part Numbers: CRLPKIT8001A00, CRLPKIT8002A00
SAFETY CONSIDERATIONS
Read these instructions entirely before installing the accessory LP (Liquid Propane) Gas Conversion Kit into the base
rooftop unit. See Table 1 for usage and contents.
Installation, start-up, and servicing of this equipment can be
hazardous due to system pressures, electrical components, and
equipment location (roofs). Only trained, qualified installers
and service technicians should install, start up, and service this
equipment.
When working on this equipment, observe precautions in
the literature and on tags, stickers, and labels attached to the
equipment. Also observe any other safety precautions that may
apply.
Never use a match or other open flame to check for leaks.
Use a soap and water solution. Fire or serious injury could
result.
This unit is designed to operate at the following manifold
pressures with LP gas: 3.0 ± 0.3 in. wg for vertical supply
units and 2.8 ± 0.3 in. wg for horizontal supply units. Exceeding this pressure will cause explosion or injury.
GENERAL
Before beginning any modifications, close the main gas
supply shutoff valve, and be certain the main-line electrical
disconnect switch is in the OFF position. Electric shock or
fire could result. TAG DISCONNECT SWITCH AND GAS
VALVE WITH APPROPRIATE WARNING LABELS.
These instructions cover the installation of liquid propane
(LP) conversion kits used to convert units from standard natural gas input to LP gas input. See Table 1 below for accessory
kit contents and usage.
IMPORTANT: Read these installation instructions thoroughly BEFORE starting installation. This instruction
and accessory is for the Centurion 48HGD/E/F units.
These units are equipped with an IGC (Integrated Gas
Unit Controller) board and a direct spark ignition system.
Table 1 — LP Kit Contents and Usage
KIT NUMBER
UNIT
TYPE OF
SYSTEM
CRLPKIT8001A00
48HGD014-028
48HGF014
5-Cell
6-Cell
STANDARD UNIT HEAT INPUT (Btuh)
Vertical/Horizontal
250,000/225,000
287,000/266,000
48HGF016-028
8-Cell
372,000/356,000
48HGE016-028
8-Cell
365,000/356,000
CRLPKIT8002A00
KIT CONTENTS
8 Orifices (LH32RF110)
Instructions
Conversion Label
Warning Label
8 Orifices (LH32RF102)
Instructions
Conversion Label
Warning Label
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111
Catalog No. 534-80028
Printed in U.S.A.
Form 48HG-3SI
Pg 1
9-01
Replaces: New
Book 1 4
Tab 1a 6a
INSTALLATION
Step 2 — Orifice Replacement
1. Remove the 9 screws securing the burners and rollout
switch to the manifold. See Fig. 3. Save screws.
2. Remove the orifices from the manifold.
3. Insert the new orifices from the accessory kit. The
orifices should be screwed in until 2 threads remain
visible. Save the old orifices for possible reinstallation if
natural gas becomes available. See Fig. 4.
4. Reattach the burner manifold assembly to the burner
brackets using the screws saved from Step 1. Make sure
that all orifices have been installed. Reattach the rollout
switch at the same time. Make sure the switch is located
in its original position. See Fig. 3.
5. Check ignitor gap and adjust if necessary. See Fig. 5 for
correct clearances.
Step 1 — Remove Burner Assembly from Unit
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
Shut off manual main gas valve in unit.
Shut off power to unit.
Remove heat section access panel. See Fig. 1.
Disconnect orange ignitor and white sensor wires from
the IGC board.
Disconnect wires from gas valve. Mark for reconnection.
Remove rollout switch leads at rollout switch. Mark for
reconnection.
Remove the wire ties securing the rollout switch leads to
the manifold.
Disconnect the incoming gas piping from the gas valve
manifold.
Remove the 2 screws securing the burner assembly to the
heater. See Fig. 2. Save screws for re-installation of burner assembly.
Remove the 2 screws securing the burner assembly to the
basepan. Save screws for re-installation of burner assembly. See Fig. 2.
Lift and remove burner assembly from unit.
Step 3 — Re-Install Burner Assembly
1. Perform the Remove Burner Assembly from Unit
section steps (4 to 11) in reverse order. Be sure to
reconnect wires to the same points from which they
were disconnected. Use the wiring label on the control
box access panel as a guide.
2. Replace any wire ties that were removed in previous
steps.
Step 4 — Apply Warning Labels
INDOOR MOTOR
ACCESS DOOR
CONTROL BOX
ACCESS DOOR
1. Apply the LP conversion label on the unit panel, next
to the current nameplate.
2. Apply the LP warning label on the outside of the control
box access door.
ROLLOUT SWITCH
LOCATION (SECOND
BURNER FROM THE END
OPPOSITE THE GAS VALVE)
FILTER
ACCESS
DOOR
HEAT
SECTION
ACCESS
PANEL
GAS VALVE
CONNECTION
9 SCREWS
Fig. 1 — Panel Locations
Fig. 3 — Burner Removal and
Rollout Switch Location
HIDDEN THIS SIDE
ORIFICE
REMOVE THESE SCREWS FOR
STEP 10
(2 PLACES)
0.560”
MAX.
REMOVE THESE
SCREWS FOR STEP 9
(2 PLACES)
MANIFOLD
Fig. 4 — Orifice Depth
Fig. 2 — Removal of Burner Assembly
2
.120/.140 O
.181 O
IGNITOR
Fig. 5 — Spark Gap Detail
Step 5 — Check Unit Operation and Make
Necessary Adjustments
SERVICE
1. Remove manifold pressure tap plug from manifold and
connect pressure gage or manometer.
2. Replace heat section access panel. Panel must be in place
before applying any power to unit.
3. Turn on electrical supply.
4. Turn on unit main gas valve.
5. Set room thermostat or room sensor to call for heat.
6. When main burners ignite, adjust regulator for 3.0 in. wg
manifold pressure for vertical supply units and 2.8 in. wg
manifold pressure for horizontal supply units. Check
manifold and orifices for leaks.
Before performing service or maintenance operations on
unit, turn off main power switch to unit. Electrical shock
could cause personal injury.
Cleaning — Inspect unit interior at beginning of each heating and cooling season and as operating conditions require.
Remove unit top panel and/or side panels for access to unit
interior.
MAIN BURNER — At the beginning of each heating season,
inspect for deterioration or blockage due to corrosion or other
causes. Observe the main burner flames.
FLUE GAS PASSAGEWAYS — The flue collector box and
heat exchanger cells may be inspected by removing heat
section access panel (Fig. 1), flue box cover, and main burner
assembly (Fig. 6). Refer to Step 1 section for burner removal
sequence. If cleaning is required, clean tubes with a wire brush.
Use caution with ceramic heat exchanger baffles. When
installing retaining clip, be sure the center leg of the clip
extends inward toward baffle. See Fig. 7.
COMBUSTION-AIR BLOWER — Clean periodically to
assure proper airflow and heating efficiency. Inspect blower
wheel every fall and periodically during heating season. For the
first heating season, inspect blower wheel bi-monthly to
determine proper cleaning frequency.
To inspect blower wheel, remove heat section access panel.
Using an inspection mirror and flashlight, look into the flue
exhaust duct to inspect the wheel. If cleaning is required,
remove motor and wheel assembly by removing the screws
holding the flue box cover to the flue box. Remove the screws
holding the inducer housing to the inlet plate. The wheel can
then be removed from the motor shaft and cleaned with a
detergent or solvent. Replace the wheel onto the motor shaft in
the correct position and reassemble the flue cover onto the flue
box.
Never use a match or other open flame to check for leaks.
Use a soap and water solution. Fire or serious injury could
result.
This unit is designed to operate at the following manifold
pressures with LP gas: 3.0 ± 0.3 in. wg for vertical supply
units and 2.8 ± 0.3 in. wg for horizontal supply units. Exceeding this pressure will cause explosion or injury.
7. Check firing rate and readjust pressure if necessary. See
nameplate.
8. Shut off manual gas valve and shut off power to unit.
9. Remove pressure gage or manometer and replace manifold pressure tap plug.
10. Turn on power to unit. Then turn on main gas valve. With
burners ignited, check pressure tap for gas leaks. Repair if
necessary.
11. Replace all access panels.
12. Set thermostat to desired temperature.
13. Check spark gap. See Fig. 5.
14. Remove warning tags from disconnect switch and gas
supply shutoff valve.
3
CERAMIC
BAFFLE
CLIP
COMBUSTION
FAN HOUSING
HEAT
EXCHANGER
SECTION
INDUCED
DRAFT
MOTOR
MAIN GAS
VALVE
IGC BOARD
(HIDDEN)
NOTE: One baffle and clip will be in each upper tube of the heat
exchanger.
Fig. 7 — Removing Heat Exchanger
Ceramic Baffles and Clips
MAIN BURNER
SECTION
Fig. 6 — Typical Gas Heating Section
Copyright 2001 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111
Catalog No. 534-80028
Printed in U.S.A.
Form 48HG-3SI
Pg 4
9-01
Replaces: New
Book 1 4
Tab 1a 6a
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