Carrier COMFORTLINK 48A3 user manual

Summary of the content on the page No. 1

48A2,A3,A4,A5020-060
Single-Package Rooftop
Gas Heating/Electric Cooling Units
with COMFORTLINK™ Controls and Scroll Compressors
User’s Information Manual
NOTE TO INSTALLER TO LIGHT UNIT
This manual should be left with the equipment owner.
DANGER
1. Do not turn off the electrical power to unit without
WARNING: If the information in this
first turning off the gas supply.
manual is not followed exactly, a fire or
2. Before attempting to start the gas heating section,
explosion may result causin

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A48-8367 GAS HEAT SECTION GAS VALVE (PANEL REMOVED) Fig. 1 — Typical Gas Section Location (48A3027 Shown) a48-3766tf Fig. 2 — Typical Gas Valve Location (48A2,A3,A4,A5020-050 Shown) 2

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a48-925tf MODE Run Status a30-2239ef Service Test Temperature Pressures Setpoints Alarm Status Inputs Outputs Configuration ESCAPE ENTER Time Clock a48-924tf Operating Modes Alarms STEP 1 STEP 2 STEP 3 a48-3767tf STEP 4 STEP 5 a48-3768tf STEP 6 STEP 7 MODE Run Status a30-2239ef Service Test Temperature Pressures Setpoints Alarm Status Inputs Outputs Configuration ESCAPE ENTER Time Clock a48-931tf Operating Modes a48-930tf Alarms STEP 8 STEP 9 STEP 10 Fig. 3 — To Light Unit 3

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6. Move the switch on the gas valve to the ON position. ENTER and arrow keys to enter the 4 digits of the password. The default password is 1111. 7. Replace the gas section access panels. 8. Turn on the electrical supply to the units. d. Push the ENTER key again. The NO/YES display will flash. 9. Open the field-installed manual gas valve. 10. Using the scrolling marquee, enable the unit to run using e. Push the or key to toggle the display to the following procedure: YES and then push ENTER. T

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a48-925tf MODE Run Status a30-2239ef Service Test Temperature Pressures Setpoints Alarm Status Inputs Outputs Configuration ESCAPE ENTER Time Clock Operating Modes a48-924tf Alarms STEP 1 STEP 2 STEP 3 a48-3767tf STEP 4 a48-3768tf STEP 5 STEP 6 Fig. 4 — To Shut Unit Off 5

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Air Filter(s) — Air filter(s) should be checked monthly Indoor-Fan Motor, Outdoor-Fan Motor, and and changed when necessary. Units may have either 2-in. or Combustion Fan Motor — Lubrication is not recom- 4-in. thick filters. For units with 2-in. thick filters, all filters will mended. Bearings will not require lubrication for at least be 20 x 24 x 2-in. size. For units with 4-in. thick filters, half the 5 years of normal operation. After 5 years, motor life can be filters will be 20 x 24 x 4-i

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6. Observe unit heating operation. Watch the burner flame Complete service instructions can be found in the unit to see if it is bright blue. If you observe a suspected mal- Controls, Start-Up, Operation, Service and Troubleshooting function or if the flame is not bright blue, call your dealer. literature. WARNING BEFORE YOU CALL FOR SERVICE, CHECK FOR PROBLEMS Components in heat section may be hot after unit has been THAT CAN BE EASILY SOLVED started. When observing flame, be careful not to get

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Copyright 2008 Carrier Corporation Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Book 1 Catalog No. 04-53480052-01 Printed in U.S.A. Form 48A-5SO Pg 8 3-08 Replaces: 48A-3SO Tab 1a