Routine System Maintenance; Quarterly Inspection (And 30 Days After Initial Start); Service; Refrigeration System - Carrier 38AUQ Installation, Start-Up And Service Instructions Manual

ROUTINE SYSTEM MAINTENANCE

These items should be part of a routine maintenance program,
to be checked every month or two, until a specific schedule for
each can be identified for this installation:
Quarterly Inspection
(and 30 days after initial start)
Indoor section
• Coil cleanliness checked.
• Return air filter replacement
• Belt tension checked
• Belt condition checked
• Pulley alignment checked
• Fan shaft bearing locking collar tightness checked
• Condensate drain checked
• Blower motor amperage
Outdoor Section
• Fan motor mounting bolts tightness
• Compressor mounting bolts
• Fan blade positioning
• Control box cleanliness and wiring condition
• Wire terminal tightness
• Refrigerant charge level
Economizer or Outside Air Damper
• Inlet filters condition
• Check damper travel (economizer)
• Check gear and dampers for debris and dirt

Refrigeration System

EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in damage to
equipment.
This system uses Puron® refrigerant which has higher
pressures than R-22 and other refrigerants. No other refrig-
erant may be used in this system. Gage set, hoses, and re-
covery system must be designed to handle Puron®. If you
are unsure consult the equipment manufacturer.

Compressor Oil

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 oils can absorb 15 times as
much water as other oils designed for HCFC and CFC re-
frigerants. Take all necessary precautions to avoid exposure
of the oil to the atmosphere.
Servicing Systems on Roofs With Synthetic
Materials —
POE (polyolester) compressor lubricants are
known to cause long term damage to some synthetic roofing
materials. Exposure, even if immediately cleaned up, may
cause embrittlement (leading to cracking) to occur in one year
or more. When performing any service which may risk expo-
sure of compressor oil to the roof, take appropriate precautions
to protect roofing. Procedures which risk oil leakage include
but are not limited to compressor replacement, repairing refrig-
erants leaks, replacing refrigerant components such as filter
drier, pressure switch, metering device, coil, accumulator, or
reversing valve.
SYNTHETIC ROOF PRECAUTIONARY PROCEDURE
1. Cover extended roof working area with an impermeable
polyethylene (plastic) drop cloth or tarp. Cover an ap-
proximate 10 x 10 ft (3.3 x 3.3 m) area.
2. 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.
3. Place terry cloth shop towel inside unit immediately un-
der component(s) to be serviced and prevent lubricant
run-offs through the louvered openings in the base pan.
4. Perform required service.
5. Remove and dispose of any oil contaminated material per
local codes.
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SERVICE