Carrier Gas Heater 48PG16 User Manual

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  
 
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
 
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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