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Carrier 38TDB - page 1
38TDB WeatherMaker™ Two-Speed Air Conditioning Unit with Puron® Installation and Start-Up Instructions NOTE: Read the entire instruction manual before starting the installation. This symbol → indicates a change since the last issue. SAFETY CONSIDERATIONS Improper installation, adjustment, alteration, service, maintenance, or use can cause expl ...
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Carrier 38TDB - page 2
INSPECT EQUIPMENT File claim with shipping company prior to installation if shipment is damaged or incomplete. Step 2—Install on a Solid, Level Mounting Pad If conditions or local codes require the unit be attached to pad, tie down bolts should be used and fastened through knockouts provided in unit base pan. Refer to unit mounting pattern in Fig ...
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Carrier 38TDB - page 3
8. Install vapor elbow (see Fig. 5B) with equalizer adapter to suction tube of line set and suction connection to indoor coil. Adapter has a 1/4-in. male connector or attaching equalizer tube. 9. Connect equalizer tube of TXV to 1/4-in. equalizer fitting on vapor line adapter. 10. Attach TXV bulb to horizontal section of suction line using bulb str ...
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Carrier 38TDB - page 4
Do not leave system open to atmosphere any longer than minimum required for installation. POE oil in compressor is extremely susceptible to moisture absorption. Always keep ends of tubing sealed during installation. If ANY refrigerant tubing is buried, provide 6–in. vertical rise at service valve. Refrigerant tubing lengths up to 36 in. may be bu ...
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Carrier 38TDB - page 5
5. Repeat this procedure as indicated in Fig. 9. System will then contain minimal amounts of contaminants and water vapor. FINAL TUBING CHECK IMPORTANT: Check to be certain factory tubing on both indoor and outdoor unit has not shifted during shipment. Ensure tubes are not rubbing against each other or any sheet metal. Pay close attention to feeder ...
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Carrier 38TDB - page 6
O/ W2 W/W1 Y1 / W 2 G R THERMIDIST A T CONTROL MODEL RH V ARIABLE-SPEED CONDENSING FURNACE TW O-SPEED AIR CONDITIONER W/W1 G Y/ Y2 C Y2 R Y1 C DHUM HUM B S1 S2 W2 R C HEA T ST AGE 1 COOL ST A GE 1 COOL ST A GE 2 HEA T ST AGE 2 FA N 24 V A C HOT 24 V A C COMM DEHUMIDIFY HUMIDIFY N/A OUTDOOR SENSOR CONNECTION Y/ Y2 HUMIDIFIER (24 V A C) OUTDOOR SENSO ...
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Carrier 38TDB - page 7
COOL ST AGE 1 FA N HEA T ST AGE 1 COOL ST AGE 2 N/A 24 V A C HOT R W/W1 Y/Y2 O/W2 Y1/W2 G 24 V A C COMM N/A OUTDOOR SENSOR CONNECTION C B S1 S2 C Y2 C PROGRAMMABLE THERMOST A T MODEL 2S SINGLE-ST AGE FURNACE TW O-SPEED AIR CONDITIONER W R Y1 R G Y See notes 1, 2, 3, and 5 A01501 24 V A C HOT 24 V A C COMM HEA T ST AGE 1 COOL ST AGE 2 FA N R C G W/W ...
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Carrier 38TDB - page 8
required. The LCC for standard PSC blower products consists of a standard humidistat which opens contacts on humidity rise and a pilot duty relay with 24v coil. NOTE: If an LCC is desired, low-speed airflow must be main- tained so that a minimum of 300 CFM/ton can be supplied during high speed LCC operation. Step 9—Make Airflow Selections AIRFLOW ...
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Carrier 38TDB - page 9
A01222 LEGEND 24 VOL T F ACTORY WIRING 24 VOL T FIELD WIRING FIELD SPLICE CONNECTION RELA Y SPDT , PILOT DUTY 24-V COIL (HN61KK324) OR EQUIV ALENT HUMIDIST A T , OPENS ON HUMIDITY RISE (HL38MG026) AIRFLOW SELECTOR R1 H AFS WIRING DIAGRAM NOTES: 1. WIRING MUST CONFORM TO NEC OR LOCAL CODES. 2. UNDERLINED LETTER ON THERMOSTAT TERMINAL INDICATES USAGE ...
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Carrier 38TDB - page 10
Step 10—Start-Up To prevent compressor damage or personal injury, observe the following: • Do not overcharge system with refrigerant. • Do not operate unit in a vacuum or at negative pressure. • Do not disable low-pressure switch. To prevent personal injury wear safety glasses, protective clothing, and gloves when handling refrigerant and o ...
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Carrier 38TDB - page 11
Step 11—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 and charging method are shown on pin ...
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Carrier 38TDB - page 12
FACTORY DEFAULTS Factory defaults have been provided in the event of failure of outdoor air thermistor, coil thermistor, and/or furnace interface jumper. ONE MINUTE SPEED CHANGE TIME DELAY When compressor changes speeds from high to low or low to high, there is a 1-minute time delay before compressor restarts. The outdoor fan motor remains running. ...
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Carrier 38TDB - page 13
Compressor Control Contactors Low and high capacity contactor coils are 24 volts. The electronic control board controls the operation of the low speed (C-L) and the high speed (C-H) contactors. TEMPERATURE THERMISTORS Thermistors are electronic devices which sense temperature. As the temperature increases, the resistance decreases. Thermistors are ...
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Carrier 38TDB - page 14
Fig. 15—Wiring Diagram—024, 036, 048 A01513 CONNECTION DIAGRAM OCT -t ° LPS HPS OAT -t ° LO HI TO INDOO R UN IT RED CCH FA N C A P YEL RED BRN OFM BL K BL U/ PNK BLU/ PNK YEL / PNK YEL / PNK BRN BRN BLK BLK RED BL U CH 11 21 23 23 YEL BLK BLK BLK C L 11 21 H C STAR T COMP RELAY BRN CAP L2 L1 EQUI P GND DUA L CAP ACI T Y ABC D BLU BRN BRN BLK ...
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Carrier 38TDB - page 15
Fig. 16—Wiring Diagram—037 A01439 CONNECTION DIAGRAM OCT -t ° LPS HPS OAT -t ° LO HI TO INDOOR UNIT CCH RED BRN BLU/ PN K BLU/ PN K YEL/ P NK YEL/PNK BRN BRN BLK BLK RED BLU CH 11 21 23 23 YEL BLK BRN BLK C L 11 21 BLU H C START COMP COMP REL AY BRN CAP BLU BLU L2 L1 EQUI P GND DUAL CAP ACIT Y A B C D BLU BRN BLK YEL BRN COMM STAT US YEL C O ...
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Carrier 38TDB - page 16
→ Fig. 17—Wiring Diagram—060 A02212 CONNECTION DIAGRA M OCT -t ∞ LPS HPS OAT -t ∞ LO HI T O IN DO O R U NIT RED CCH FA N C A P RED BRN OFM BL K BL U/ PNK BLU / PN K YEL / P NK YEL / PN K BRN BR N BLK RE D BLU CH 11 21 23 13 YEL BLK BLK H C ST ART COMP RELA Y BRN CAP L2 L1 EQUI P GND DUAL CAP A C I TY AB CD BLU BRN BLK YEL BRN BLK C O W Y ...
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