Carrier PG9UAA Troubleshooting Manual

Contents

Carrier PG9UAA Troubleshooting Manual Manual pdf 11 page image

11Table 2 – Cooling Tonnage vs. Airflow (CFM)AIR CONDITIONING TONS(12,000 BTU/HR) AIRFLOW (CFM) 040, 060, &3T ---080 MODEL5T ---080 & 100MODEL 120 MODEL1---1/2 525 X2 700 X X X2---1/2 875 X X X3 1050 X X X3---1/2 1225 X X X4 1400 X X5 1750 X X6 2100 X52527002700875 1050875700 8752 1050105011225122512251400140012251750117501122517502100DEF.DEF.DEF.040, 060, 3T-0805T-080, 100120BASED ON 350 CFM/TON (SETUP SWITCH SW1-5 OFF)SETUP SWITCH SW2/SW3 POSITIONSMODELSIZE600280028001000 12001000800 10002 1200120011400140014001600160014002000120001140020002100DEF.DEF.DEF.040, 060, 3T-0805T-080, 100120BASED ON 400 CFM/TON (SETUP SWITCH SW1-5 ON)1. DEFAULT A/C AIRFLOW WHEN A/C SWITCHES ARE IN OFF POSITION2. DEFAULT CONT. FAN AIRFLOW WHEN CF SWITCHES ARE IN OFF POSITION3. SWITCH POSITIONS ARE ALSO SHOWN ON FURNACE WIRING DIAGRAMSETUP SWITCH SW2/SW3 POSITIONSMODELSIZEA10472Air Conditioning or Continuous Fan Airflow Selection ChartHIGH HEAT TEMPERATURE RISE TOO LOW -- Generally, this indicates the HI solenoidin gas valve GV has failed or the furnace is extremely underfired.STEP ACTION YES NO GO TO1. Remove the blower access panel. Disconnect the R thermostat lead from the furnace con-trol board. If setup switch SW1--2 is ON then set it to OFF.22. Depress the door switch. Use piece of tape to hold it closed. 33. Jumper R and W/W1 thermostat terminals. 44. When the furnace is running in low heat, clock the low heat gas rate. You have 16 minuteson this first call for heat before unit switches to high heat. On propane installations checkthe manifold pressure.55. When the furnace is running in high heat, clock the high heat gas rate. On propane installa-tions check the manifold pressure.66. Is the high heat rate approximately the same as the low heat rate? 7 117. Do you have 24 vac across gas valve terminals HI and C OM--24 V on 2--stage gas valve dur-ing high heat?10 88. You have an open wire or bad terminal on the BROWN wire from the high heat pressureswitch HPS to the gas valve GV. Repair it or replace the harness.99. Go to the page number indicated in Index for the CLEANUP AND STARTUP INSTRUC-TIONS.INDEX10. Replace the gas valve. 911. Is the high heat rate within 2% of that specified on the rating plate? 13 12