Carrier 40QAC Complete Outdoor Refrigerant Piping Connec- tions, Connection at Outdoor Unit

40QAC/38HDR -- 40QAQ/38QRR

Complete Outdoor Refrigerant Piping Connec- tions

Follow the following general guidelines:

1.Use refrigerant grade field – supplied tubing. Refer to Table 4 for the correct line sizes.

2.Do not use less than 10 ft (93.05 m) of interconnecting tubing.

!CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage or improper operation.

If any section of pipe is buried, there must be a 6 in. (152.4

mm)vertical rise to the valve connections on the outdoor unit. If more than the recommended length is buried, refrigerant may migrate to cooler, buried section during extended periods of system shutdown. This causes refrigerant slugging and could possibly damage the compressor at start-up.

When more than 80 ft (24.4 m) of interconnecting tubing is used, consult the Duct-Free Split System Long Line Application Guide for required accessories.

3.On cooling only units, insulate the liquid line. On heat pumps, insulate both lines. A minimum of 1/2 inch foam pipe insulation is recommended.

4.Run the refrigerant tubes as directly as possible and avoid unnecessary turns and bends.

5.Suspend refrigerant tubes to avoid damage to insulation or tubes so they do not transmit vibration to the structure.

6.When passing refrigerant tubes through the wall, seal the opening so rain and insects do not enter the structure. Leave some slack in refrigerant tubes between structure and out- door unit to absorb vibration.

NOTE: A fusible plug is located in unit suction line; do not cap this plug. If local codes require additional safety devices, install as directed.

Connection at Outdoor Unit

!CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage or improper operation.

To prevent damage to unit or service valves observe the following:

SA brazing shield MUST be used.

SWrap service valves with wet cloth or use a heat sink material.

1.Braze the connector tubes (field supplied for the 38HDR units and factory supplied for the 38QRR units) to the inlet of the factory supplied filter drier. If a cooling only unit is being installed move to step 3 (see Fig. 8).

2.Remove the plastic cap from the liquid and suction service valve on the 38QRR unit and assemble the heating piston and piston cap supplied with the outdoor unit as shown in Fig. 16.

NOTE: Teflon Seal must face toward the outdoor heat pump unit.

A09538

Fig. 16 - AccuRater Metering Device at Service

Valve (Bypass Type Components),

Heat Pump Systems Only

NOTE: The Teflon seal on the piston should point towards the liquid service valve.

The size of the factory supplied piston might have to adjusted for long line applications (over 80 ft / 24.4 m). Refer to the Duct Free Long Line Application Guide for additional information.

3.On 38HDR units, remove the plastic caps on the liquid and suction service valves. Braze the completed filter drier as- sembly (from Step 1) to the liquid service valve. On the 38QRR unit, connect the completed filter drier assembly (from Step 1) to the piston cap.

4.Braze the field supplied line set to the filter drier assembly and to the suction valve.

5.Insulate any exposed areas between the filter drier and the liquid valve.

Complete Outdoor Power and Control Wiring

!WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or death.

The unit cabinet must have an uninterrupted or unbroken ground to minimize personal injury if an electrical fault should occur. The ground may consist of electrical wire or metal conduit when installed in accordance with existing electrical codes.

!CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage or improper operation.

Unit failure as a result of operation on improper line voltage or excessive phase imbalance constitutes abuse and may cause damage to electrical components. Such operation could void any applicable Carrier warranty.

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