48PG16
Gas Heating/Electric Cooling
Single Package Rooftop Units
High Altitude Kit Accessory
Installation Instructions
Part No. CRNGHIAT002A00
HIGH ALTITUDE KIT USAGE AND CONTENTS
ACCESSORY PART NO.
CRNGHIAT002A00
USAGE
CONTENTS
9 Burner Orifices, Drill Size No. 31, 0.120 in.
9 Burner Orifices, Drill Size No. 32, 0.116 in.
48PG16
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 (integrated gas
controller) board. See Fig. 3.
SAFETY CONSIDERATIONS
Read these instructions entirely before installing the acces-
sory high altitude kit into the base rooftop unit.
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.
Table 1 — Altitude Compensation*
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.
48PG16
ELEVATION
NATURAL GAS
(ft)
ORIFICE†
0-1,999
2,000
30
30
31
31
31
31
32
32
32
35
36
37
38
39
3,000
4,000
5,000
6,000
7,000
Before beginning any modification, close main gas supply
shutoff valve. Be certain that the main line electrical discon-
nect switch is in the OFF position and lockout tag is
installed. Electric shock or fire could result. Tag disconnect
switch and gas valve with suitable warning labels.
8,000
9,000
10,000
11,000
12,000
13,000
14,000
*As the height above sea level increases, there is less oxygen per cubic foot
of air. Therefore, heat input rate should be reduced at higher altitudes.
Includes a 4% input reduction per each 1000 ft.
GENERAL
†Orifices available through your Carrier dealer.
The high altitude conversion kit is used to install natural gas
units at elevations as high as 7000 ft. Recommended orifice
sizes will derate the heating input by approximately 4% per
1000 ft of elevation. For elevations above 7000 ft, see Table 1.
Step 2 — Replace Orifice Fittings
1. Remove standard orifice fittings from the manifold
pipe.
INSTALLATION
2. Select the correct orifice size based on local elevation.
Refer to Table 1.
3. Install new orifice fittings.
Step 1 — Remove Gas Manifold Pipe
1. Close the manual shutoff valve on the gas supply
NOTE: Pipe sealant is not required. Never use Teflon
tape on fitting threads since loose pieces may plug gas
orifices.
piping.
2. Open gas section access door. See Fig. 1.
3. Set the switch on the main gas valve to the OFF posi-
tion. 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.
Step 3 — Reinstall Manifold Pipe
1. Attach manifold pipe to the burner bracket using four
screws. See Fig. 3. Make sure that all orifice fittings
are properly seated in the burner inlets.
2. Reconnect wires to the igniter, flame sensor, flame
rollout switch, and gas valve.
3. Reconnect gas piping to the gas valve.
7. Remove wires connected to the flame rollout switch.
Mark wires.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480022-01 Printed in U.S.A. Form 48PG-21SI Pg 1 12-05 Replaces: New
Book 1
4
Tab 1a 6a
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9. Remove pressure gage or manometer and replace
manifold pressure tap plug.
MANIFOLD
MOUNTING
SCREWS
10. Start up unit. With burners ignited, check pressure tap
plug for gas leaks. Repair if necessary.
MAIN
GAS
VALVE
11. Close and secure gas section access door.
12. Set thermostat to desired temperature (units with electro-
mechanical control). For units with ComfortLink™
control, to test the operation of the gas section, the
HEAT submenu of Service Test may be used. See the
Controls Start-Up, Operation, Service, and Trouble-
shooting Instructions for more details on use of Service
Test. For normal operation, make sure that the set points
are at the normal heat set points.
MANIFOLD
PRESSURE
TAP PLUG
13. Remove warning tags from disconnect switch and gas
supply shutoff valve.
MANIFOLD
MOUNTING
SCREWS
Fig. 3 — Typical Main Burner Section
3
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Copyright 2005 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480022-01 Printed in U.S.A. Form 48PG-21SI Pg 4 12-05 Replaces: New
Book 1
4
Tab 1a 6a
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