Carrier 48Pg16 Users Manual

48PG16 to the manual 4cc52116-6116-4695-a49f-a9818ccae2ce

: Carrier Carrier-48Pg16-Users-Manual-310802 carrier-48pg16-users-manual-310802 carrier pdf

Open the PDF directly: View PDF .
Page Count: 4

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

Ta b 1 a 6 a

Installation Instructions

Part No. CRNGHIAT002A00

HIGH ALTITUDE KIT USAGE AND CONTENTS

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.

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*

*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.

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.

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.

ELEVATION

(ft)

48PG16

NATURAL GAS

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

48PG16

Gas Heating/Electric Cooling

Single Package Rooftop Units

High Altitude Kit Accessory

2

Step 4 — Check Unit Operation and Make

Necessary Adjustments

NOTE: Gas pressure must not be less than 5 in. wg or greater

than 13 in. wg at the unit connection.

1. Remove pressure tap plug from manifold pipe and

connect a pressure gage or manometer.

2. Turn on electrical supply.

3. Open the manual shutoff valve on the gas supply pip-

ing. Check pipe connection to main gas valve for

leaks.

4. Set the switch on the main gas valve to the ON position.

5. Call for high stage heat (W2 energized). The unit may

require several ignition attempts due to trapped air in

the manifold pipe.

6. When main burners ignite check orifice fittings for

leaks. Repair if necessary.

7. Verify that manifold pressure is between 2.7 and

3.0 in. wg while in high fire (W2 energized). Readjust

pressure if necessary.

8. Shut down unit by turning down thermostat (units with

electro-mechanical control) or putting unit in Service

Test mode (units with ComfortLink™ control), shut-

ting off manual gas valve, and shutting down power to

unit.

Never use a match or other open flame to check for leaks.

Use a soap and water solution. Fire or serious injury could

result.

If unit is equipped with a 2-stage gas valve, ensure valve

has energized second stage (high fire) before adjusting

manifold pressure. Improper manifold pressures may cause

explosion or injury.

This unit is designed to operate at 3.0 in. wg (± 0.3 in. wg)

manifold pressure at high fire. Exceeding this pressure will

cause explosion or injury.

Fig. 1 — Panel and Filter Locations

CONDENSER

COIL ACCESS

PANEL

FILTER

ACCESS DOOR

CONTROL BOX

AND COMPRESSOR

ACCESS DOOR

BASEPAN

CONNECTIONS

ACCESS PANEL

BAROMETRIC

RELIEF DAMPER

HOODS

OUTDOOR AIR

SCREENS

(HIDDEN)

ECONOMIZER HOODS

ELECTRICAL

OPTIONS

PANEL

GAS SECTION

ACCESS DOOR

INDUCED

DRAFT

MOTOR

MAIN GAS

VALVE

MAIN

BURNER

SECTION

COMBUSTION

FAN HOUSING

HEAT

EXCHANGER

SECTION

Fig. 2 — Typical Gas Heating Section

3

9. Remove pressure gage or manometer and replace

manifold pressure tap plug.

10. Start up unit. With burners ignited, check pressure tap

plug for gas leaks. Repair if necessary.

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.

13. Remove warning tags from disconnect switch and gas

supply shutoff valve.

MAIN

GAS

VALVE

MANIFOLD

MOUNTING

SCREWS

MANIFOLD

MOUNTING

SCREWS

MANIFOLD

PRESSURE

TAP PLUG

Fig. 3 — Typical Main Burner Section

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

Ta b 1 a 6 a

Copyright 2005 Carrier Corporation