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| Reversing Valve | Connection |
| Low/High Speed | Contactor Connection |
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| HP/AC | C | SEV RVS | C | HI | LO |
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| R33 | R9 |
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| LPS | Switch Connector |
| R61 |
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| C31 |
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| 1 | PL4 | OAT | |
| R65 |
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| DEFROST | FORCED |
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| OCT | Thermistor |
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| PL5 |
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Defrost Time 30 |
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Selectors | 60 | 1 2 | 30 | C18 |
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| BRN | VC |
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| To Run |
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| VH | Capacitor |
| Y2 |
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Thermostat | Y1 |
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Low Voltage RC |
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Connector |
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| RED | Crankcase Heater | |
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| R86 | R87 |
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| Connection |
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| A | B | C D | H K 3 8 E A 0 0 1 |
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| A01192 |
Fig. 12—Control Board
THERMISTOR CURVE
| 90 | |
(KOHMS) | 80 | |
70 | ||
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| 60 | |
RESISTANCE | 50 | |
20 | ||
| 40 | |
| 30 |
10
0
0 | 20 | 40 | 60 | 80 | 100 | 120 |
TEMPERATURE (DEG. F)
A91431
Fig. 13—Resistance Values Versus Temperature
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
Control Box
Side of Unit
THERMISTOR PLACED UNDERNEATH BASE PAN (ATTACHED TO BASE PAN WITH ADHESIVE)
A00430
Fig. 14—View from Top of Base Pan
To prevent personal injury wear safety glasses, protective clothing, and gloves when handling refrigerant and observe the following:
•Back seating service valves are not equipped with Schrader valves. Fully back seat (counterclockwise) valve stem before removing gage port cap.
Do not vent refrigerant to atmosphere. Recover during system repair or final unit disposal.
Follow these steps to properly start up the system:
1.The outdoor unit is equipped with a crankcase heater which operates when the compressor is off. Energize crankcase heater 24 hr before starting unit. To energize heater only, set indoor thermostat to OFF position and close power disconnect to unit.
NOTE: Starting the compressor without a minimum of 12 hr of crankcase heat prior to initial
2.Fully back seat (open) liquid and vapor tube service valves.
3.Unit is shipped with valve stem(s) front seated and caps installed. Replace stem caps after system is opened to refrig- erant flow (back seated). Replace caps finger tight and tighten additional 1/12 turn (20
4.Close electrical disconnects to energize system.
5.Set room thermostat at desired temperature. Be sure 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
6.Set room thermostat to COOL and fan control to AUTO or ON as desired. Wait for appropriate time delay(s). Operate unit for 15 minutes. Check refrigerant charge.
NOTE: If unit has not operated within the past 12 hr or following a unit
10