Carrier Split Systems and Condensers 38AUD

Condenser coil cleanliness checked.

Outdoor hood inlet filters cleaned

Fan shaft bearing locking collar tightness checked

Condenser fan motor mounting bolts tightness

IMPORTANT: To clean the NOVATION condenser coil, chemicals are NOT to be used; only water is approved as the cleaning solution. Only clean potable water is authorized for cleaning NOVATION condensers.

Remove screws holding rear corner posts and top cover in place. Pivot top cover up 305 to 457 mm (12 to 18 in.) and support with a rigid support.

Carefully remove any foreign objects or debris attached to the coil face or trapped within the mounting frame and brackets.

Using a high pressure water sprayer, purge any soap or industrial cleaners from hose and/or dilution tank prior to wetting the coil. Clean condenser face by spraying the coil core steadily and uniformly from top to bottom, directing the spray straight into or toward the coil face.

IMPORTANT: Do not exceed 6205 kPa (900 psig) or a 45 degree angle; nozzle must be at least 30 cm (12 in.) from the coil face. Reduce pressure and use caution to prevent damage to air centers (fins). Do not fracture the braze between air centers and refrigerant tubes. Allow water to drain from the coil core and check for refrigerant leaks prior to start up.

Replace top cover and rear corner posts.

CAUTION: EQUIPMENT DAMAGE HAZARD. Failure to follow this caution may result in damage to equipment.

The compressor in a Puron system uses a polyolester (POE) oil. This oil is extremely hygroscopic, meaning it absorbs water readily.

POE (polyolester) compressor lubricants are known to cause long term damage to some synthetic roofing materials.

Synthetic Roof Precautionary Procedure:

Cover extended roof working area with an impermeable polyethylene (plastic) drop cloth or tarp. Cover an approximate 3.3 x 3.3 m (10 x 10 ft) area.

Cover area in front of the unit service panel with a terry cloth shop towel to absorb lubricant spills and prevent run-offs, and protect drop cloth from tears caused by tools or components.

Place terry cloth shop towel inside unit immediately under component(s) to be serviced and prevent lubricant run-offs through the louvered openings in the base pan.

Remove and dispose of any oil contaminated material per local codes.

Check that electric power supply agrees with unit nameplate data.

Verify that the compressor crankcase heater is securely in place.

Check that the compressor crankcase heater has been on at least 24 hours.

Recheck for leaks using the procedure outlined in the Pre-Start-Up section, Leak Test and Dehydration.

Ensure that the preliminary charge has been added as described in the Pre-Start-Up section, Preliminary Charge.

All internal wiring connections must be tight, and all barriers and covers must be in place.

NOTE: The 38AUD units are factory charged with the required amount of oil. If recharging in required, use Emkarate RL 32-3MAF for the 38AUD units.

Set the space thermostat to a set point above space temperature so that there is no demand for cooling.

Close the 38AUD disconnect switch. Only the crankcase heater will be energized.

Reset the space thermostat below ambient so that a call for cooling is ensured.

Caution: UNIT DAMAGE HAZARD Failure to follow this caution may result in equipment damage.

Never charge liquid into the low-pressure side of system. Do not overcharge. During charging or removal of refrigerant, be sure indoor-fan system is operating. Ensure both outdoor fan motors are running; bypass any Motormaster function.

Refer to Cooling Charging Charts, Fig. 16 through Fig. 18. For applications with line lengths greater than 38m (125 ft), contact Carrier representative.

Vary refrigerant until the conditions of the chart are met.

Note that the charging charts are different from the type normally used. The charts are based on charging the units to the correct subcooling for the various operating conditions.