Carrier 38CKB ÐCompressor Crankcase Heat, ÐInstall Electrical Accessories, If Any

CONNECT CONTROL WIRING Ð Route 24-v control wires through control wiring grommet and connect to brown and blue pigtails supplied in unit splice box. (See Fig. 5.)

Use furnace transformer, fan-coil transformer, or accessory trans- former for control power, 24-v/40va minimum.

NOTE: Use of available 24-v accessories may exceed the mini- mum 40-va power requirement. Determine total transformer load- ing and increase the transformer capacity or split the load with an accessory transformer as required.

Step 6ÐCompressor Crankcase Heat

When equipped with a crankcase heater, energize heater a mini- mum of 24 hrs before starting unit. To energize heater only, set thermostat to OFF position and close electrical disconnect to outdoor unit.

A crankcase heater is required if the refrigerant tubing is longer than 50 ft (15.24m).

Step 7ÐInstall Electrical Accessories, If Any

Refer to the individual instructions packaged with the kit or accessory when installing.

Step 8ÐStart-Up and Check Charge

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.

In scroll compressor applications:

·Dome temperatures may be hot.

·In 3 phase application, incorrect phasing will cause reverse rotation, resulting in elevated noise levels, equalized pres- sures and reduced current draw. Correct by reversing power connection L1 and L2 on contactor.

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 (counter clockwise) valve stem before removing gage port cap.

·Front seating service valves are equipped with Schrader valves.

Do not vent refrigerant to atmosphere. Recover during system repair or final unit disposal.

1.Fully back seat (open) liquid and vapor tube service valves.

2.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 1/6 turn with wrench.

3.Close electrical disconnects to energize system.

4.Set room thermostat at desired temperature. Be sure set point is below indoor ambient temperature.

5.Set room thermostat at COOL and fan switch at FAN or AUTO, as desired. Operate unit for 15 minutes. Check system refrigerant charge.

6.Factory charge is shown on unit rating label. Adjust charge by following procedure shown on charging tables located on unit.

Step 9ÐLeave User's Manual with Owner

For continued high performance and to minimize possible equip- ment failure, periodic maintenance MUST be performed on this equipment.

Leave User's Manual with owner. Explain system operation and periodic maintenance requirements outlined in manual. Frequency of maintenance may vary depending on geographic areas, such as coastal applications which require more frequent maintenance.

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