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Table 12 — Indoor Unit Maintenance Checklist
MAINTENANCE CHECKLIST
Outdoor unit specific: (for accessories
refer to unit specific literature)
Inspect, clean, or replace air filter if dirty.
Inspect and clean blower assembly (includes
blower housing, wheel, and motor).
Lubricate shaft bearings.
Inspect internal and external cabinet. Clean
as needed.
Inspect electrical disconnect for proper
function. Repair or replace as necessary.
Inspect electrical components, wiring, and
connections. Tighten loose connections.
Repair or replace damaged components and
wiring.
Inspect evaporator coil. Clean if dust, dirt, or
debris is present.
c
Clean condensate pan, trap, and drain lines
(more frequent maintenance may be
required in humid climates — consult your
local HVAC dealer).
Inspect motor and fan for damage. Make
Inspect airflow system (ductwork). Check for
leaks and repair as needed.
NOTE(S):
a. The above list may not include all maintenance items. Inspection intervals may
vary depending on climate and opening hours. Consult your Carrier dealer
about a service contact for seasonal inspections
b. Monthly maintenance items and outdoor unit rinsing may be performed by the
customer. All other maintenance items and all service work must be performed
by a qualified service technician. Read all warning labels.
c. Do not use harsh chemicals or high pressure water on coils. More frequent rins-
ing is required near a sea cost.
SERVICE
Refrigeration System
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in damage to
equipment.
This system uses R-410A refrigerant which has higher
pressures than R-22 and other refrigerants. No other refrigerant
may be used in this system. Gauge set, hoses, and recovery
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 an R-410A 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 refrigerants. Take all
necessary precautions to avoid exposure of the oil to the
atmosphere.
RECOMMENDED
a
INTERVAL
Monthly
Annual
X
CAUTION
CAUTION
SERVICING
SYNTHETIC MATERIALS
POE (polyolester) compressor lubricants are known to cause long
b
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 exposure of compressor oil to the roof,
take appropriate precautions to protect roofing. Procedures which
X
risk oil leakage include but are not limited to compressor replace-
ment, repairing refrigerants leaks, replacing refrigerant compo-
X
nents such as filter drier, pressure switch, metering device, coil,
accumulator, or reversing valve.
X
Synthetic Roof Precautionary Procedure:
1.
Cover extended roof working area with an impermeable
X
polyethylene (plastic) drop cloth or tarp. Cover an approxi-
mate 10 x 10 ft (3.3 x 3.3 m) area.
X
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.
X
3.
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.
X
4.
Perform required service.
5.
Remove and dispose of any oil contaminated material per
local codes.
LIQUID LINE FILTER DRIER
The factory-provided reversible filter drier is specifically designed
to operate with Puron. Replace the filter drier with factory-
authorized components only with a filter drier with desiccant
made from 100% molecular sieve grade XH-11. Filter drier must
be replaced whenever the refrigerant system is opened.
When removing a filter drier, use a tubing cutter to cut the drier
from the system. Do not unsweat a filter drier from the system.
Heat from unsweating will release moisture and contaminants
from drier into system.
FIELD REFRIGERANT ACCESS PORTS
Field service access to refrigerant pressures is through the ac-
cess ports located at the service valves (see Fig. 19-21). These
ports are 1/4 in. SAE Flare couplings with Schrader check
valves and service caps. Use these ports to admit nitrogen to
the field tubing during brazing, to evacuate the tubing and
evaporator coil, to admit initial refrigerant charge into the low-
side of the system and when checking and adjusting the system
refrigerant charge. When service activities are completed, en-
sure the service caps are in place and secure; check for leaks. If
the Schrader check valve must be removed and re-installed,
tighten to 2-3 in.-lb (23-34 N-cm).
23
SYSTEMS
ON
ROOFS
WITH
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