Carrier 48PG16 installation instructions High Altitude Kit Usage And Contents, General

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.	USAGE	CONTENTS
CRNGHIAT002A00	48PG16	9 Burner Orifices, Drill Size No. 31, 0.120 in.
		9 Burner Orifices, Drill Size No. 32, 0.116 in.

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.

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.

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.

GENERAL

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.

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 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.

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 (integrated gas controller) board. See Fig. 3.

Table 1 — Altitude Compensation*

ELEVATION	48PG16
	NATURAL GAS
(ft)
	ORIFICE†
0-1,999	30
2,000	30
3,000	31
4,000	31
5,000	31
6,000	31
7,000	32
8,000	32
9,000	32
10,000	35
11,000	36
12,000	37
13,000	38
14,000	39

*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.

†Orifices available through your Carrier dealer.

Step 2 — Replace Orifice Fittings

1.Remove standard orifice fittings from the manifold pipe.

2.Select the correct orifice size based on local elevation. Refer to Table 1.

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.

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.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book	1	4	Catalog No. 04-53480022-01	Printed in U.S.A.	Form 48PG-21SI	Pg 1	12-05	Replaces: New
Tab	1a	6a