Service Manual

6
SAFETY CONSIDERATIONS
Installation, service, and repair of these units should be
attempted only by trained service technicians familiar with
standard service instruction and training material.
All equipment should be installed in accordance with
accepted practices and unit Installation Instructions, and in
compliance with all national and local codes. Power should
be turned off when servicing or repairing electrical
components. Extreme caution should be observed when
troubleshooting electrical components with power on.
Observe all warning notices posted on equipment and in
instructions or manuals.
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could result in personal
injury or equipment damage.
R- 410A systems operate at higher pressures than
standard R- 22 systems. Do not use R- 22 service
equipment or components on R- 410A equipment.
Ensure service equipment is rated for R- 410A.
!
WARNING
Refrigeration systems contain refrigerant under pressure.
Extreme caution should be observed when handling
refrigerants. Wear safety glasses and gloves to prevent
personal injury. During normal system operations, some
components are hot and can cause burns. Rotating fan
blades can cause personal injury. Appropriate safety
considerations are posted throughout this manual where
potentially dangerous techniques are addressed.
INTRODUCTION
This document provides required system information
necessary to install, service, repair or maintain the family air
conditioners and heat pumps using R- 22 or R- 410A
refrigerant.
Refer to the unit specifications and technical support
manuals for rating information, electrical data, required
clearances, additional component part numbers and related
pre- sale data. Installation Instructions are also available per
specific models.
INSTALLATION GUIDELINE
Residential New Construction
Specifications for these units in the residential new
construction market require the outdoor unit, indoor unit,
refrigerant tubing sets, metering device, and filter drier listed
in specification sheets and technical support manuals. DO
NOT DEVIATE. Consult unit Installation Instructions for
detailed information.
Add- On Replacement (Retrofit) - R- 22 to
R- 410A
Specifications for these units in the add- on
replacement/retrofit market require change- out of outdoor
unit, metering device, and all capillary tube coils.
Change- out of indoor coil is recommended. There can be
no deviation.
1. If system is being replaced due to compressor
electrical failure, assume acid is in system. If system
is being replaced for any other reason, use approved
acid test kit to determine acid level. If even low levels
of acid are detected install factory approved, 100
percent activated alumina suction- line filter drier in
addition to the factory supplied liquid- line filter drier.
Remove the suction line filter drier as soon as
possible, with a maximum of 72 hr.
2. Drain oil from low points or traps in suction- line and
evaporator if they were not replaced.
3. Change out indoor coil or verify existing coil is listed in
the specifications or AHRIdirectory.org.
4. Unless indoor unit is equipped with a R- 410A
approved metering device, change out metering
device to factory supplied or field- accessory device
specifically designed for R- 410A.
5. Replace outdoor unit with R- 410A outdoor unit.
6. Install factory- supplied liquid- line filter drier.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Never install suction- line filter drier in the liquid- line
of an R- 410A system.
CAUTION
!
7. If suction- line filter drier was installed for system
clean up, operate system for 10 hr. Monitor pressure
drop across drier. If pressure drop exceeds 3 psig,
replace suction- line and liquid- line filter driers. Be
sure to purge system with dry nitrogen and evacuate
when replacing filter driers. Continue to monitor
pressure drop across suction- line filter drier. After 10
hr of runtime, remove suction- line filter drier and
replace liquid- line filter drier. Never leave suction- line
filter drier in system longer than 72 hr (actual time).
8. Charge system. (See unit information plate.)
Seacoast
Coastal units are available in selected models and sizes of
Air Conditioners and Heat Pumps. These units have
protection to help resist the corrosive coastal environment.
Features include:
S Epoxy coated coils
S Complete baked- on paint coverage
(both sides of external sheet metal and grilles)
S Paint coated screws
Coastal environments are considered to be within 2 miles of
the ocean. Salt water can be carried as far away as 2 miles
from the coast by means of sea spray, mist or fog.
Line- of- sight distance from the ocean, prevailing wind
direction, relative humidity, wet/dry time, and coil
temperatures will determine the severity of corrosion
potential in the coastal environment.
LOW- AMBIENT COOLING
GUIDELINE
The minimum operating temperature for these units in
cooling mode is 55_F/12.7_C outdoor ambient without
additional accessories. Low ambient cannot be used with
Communicating control. If Low ambient requirements are
needed, use as non- communicating, and refer to
specification sheets for proper accessories required. Wind
baffles are required when operating in cooling mode at
ambients below 55_F/12.7_C. Plans are shown in Low
Ambient Pressure Kit instructions.