4. Close electrical disconnects to energize system.
5. Set room thermostat at desired temperature. Be sure the set
point is below indoor ambient and is set low enough to
energize desired speed.
NOTE: Carrier electronic thermostats are equipped with a 15-
minute staging timer. This timer prevents the dual capacity system
from operating at high capacity until unit has been operating in low
capacity for 15 minutes unless there is at least a 5°F difference
between room temperature and thermostat set point. To force high
capacity, adjust the set point at least 5° below room ambient for
cooling or 5° above room ambient for heating.
6. Set room thermostat to COOL or HEAT and fan control to
AUTO or ON as desired. Wait for appropriate time delay(s).
Operate unit for 15 minutes. Check refrigerant charge.
Step 12—Check Charge
Service valve gage ports are not equipped with Schrader
valves. To prevent personal injury, make sure gage manifold
is connected to the valve gage ports before moving valves off
fully back seated position. Wear safety glasses and gloves
when handling refrigerant.
UNIT CHARGE
Factory charge is shown on unit rating plate. To check charge in
cooling mode, refer to Cooling Only Procedure. To check charge
in heating mode, refer to Heating Check Chart Procedure.
Adjust charge in both heating and cooling by following procedure
shown on charging tables located on unit information plate on back
side of access panel.
NOTE: Unit is to be charged in high capacity only. Charging in
low capacity may cause compressor chattering and possible
damage to the compressor.
COOLING ONLY PROCEDURE
1. Operate unit a minimum of 10 minutes before checking
charge.
Table 4—Airflow Selection for 58UHV, 58UXV Furnaces (CFM)
38YDB
UNIT
SIZE
FURNACE
MODEL/HEATING
SIZE
FURNACE AIRFLOW SELECTION BOARD SETTINGS
Cool Size
Jumper
Position
AC/HP
Jumper
Position
Cool CFM Per Ton Jumper Position
400 350 315
Heat Pump Heating Airflow
*
High Low High Low High Low
024 060 M-LO
HP—EFFY 865 510 735 500 660 500
HP—CMFT 780 500 660 500 595 500
036
060 HI
HP—EFFY 1260 780 1100 680 990 585
HP—CMFT 1135 700 990 610 895 555
080 M-LO
HP—EFFY 1260 790 1100 700 990 625
HP—CMFT 1135 715 990 630 895 560
100 LO
HP—EFFY 1260 780 1090 775 990 700
HP—CMFT 1130 700 980 700 890 700
120 LO
HP—EFFY 1195 865 1085 785 985 785
HP—CMFT 1075 780 975 750 885 750
048
080 HI
HP—EFFY 1635 1040 1470 915 1325 820
HP—CMFT 1510 940 1325 825 1190 740
100 M-HI
HP—EFFY 1680 1040 1465 915 1325 820
HP—CMFT 1510 935 1320 825 1190 740
120 M-HI
HP—EFFY 1650 1070 1465 975 1315 930
HP—CMFT 1485 965 1320 880 1185 835
060
100 HI
HP—EFFY 2085 1300 1840 1150 1655 1025
HP—CMFT 1890 1170 1655 1035 1490 920
120 HI
HP—EFFY 2110 1300 1865 1140 1640 1080
HP—CMFT 1900 1170 1650 1025 1475 970
*
Heat Pump Cooling Airflow always matches HP—EFFY Heat Pump Heating Airflow
Table 5—Airflow Selection for 58MVP Furnaces (CFM)
38YDB
UNIT
SIZE
HIGH-SPEED
A/C SETUP
SWITCH POSITION
FURNACE MODEL/HEATING SIZE
LOW-SPEED
CF SETUP
SWITCH POSITION
040 060 080 100 120
A/C-1 A/C-2 A/C-3 High Low High Low High Low High Low High Low CF-1 CF-2 CF-3
024 OFF ON OFF 800 565 800 515 ——————OFF OFF OFF
036 OFF OFF ON 1200 800 1200 800 1200 800 1200 800 ——OFF ON OFF
048 OFF ON ON ——————1600 1000 1600 1000 ON ON OFF
060 ON ON ON ——————2000 1200 2000 1200 OFF OFF ON
9
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