IMPORTANT INFORMATION
3
T
O
AVOID
POSSIBLE
INJURY
,
EXPLOSION
OR
DEATH
,
PRACTICE
SAFE
HANDLING
OF
REFRIGERANTS
.
THE
COMPRESSOR PVE OIL FOR R-410A UNITS IS EXTREMELY
SUSCEPTIBLE TO MOISTURE ABSORPTION AND COULD
CAUSE
COMPRESSOR FAILURE. DO NOT LEAVE SYSTEM OPEN TO ATMOSPHERE
ANY LONGER THAN NECESSARY FOR INSTALLATION.
SYSTEM CONTAMINANTS, IMPROPER SERVICE PROCEDURE AND/OR
PHYSICAL ABUSE AFFECTING HERMETIC COMPRESSOR
ELECTRICAL
TERMINALS MAY CAUSE DANGEROUS SYSTEM VENTING.
Notice:
When the outdoor unit is connected to main power, the
inverter board has a small current owing into it to be pre-
pared for operation when needed. Due to this, the Control
Board components have to be cooled even when the unit is
not running. For this cooling operation, the condenser fan
may come on at any time, including in the winter months.
Any obstruction to the outdoor fan should be avoided at all
times when the unit is powered to prevent damage.
The successful development of hermetically sealed refrig-
eration compressors has completely sealed the compres-
sor’s moving parts and electric motor inside a common
housing, minimizing refrigerant leaks and the hazards
sometimes associated with moving belts, pulleys or cou-
plings.
Fundamental to the design of hermetic compressors is
a method whereby electrical current is transmitted to the
compressor motor through terminal conductors which pass
through the compressor housing wall. These terminals are
sealed in a dielectric material which insulates them from
the housing and maintains the pressure tight integrity of
the hermetic compressor. The terminals and their dielectric
embedment are strongly constructed, but are vulnerable
to careless compressor installation or maintenance pro-
cedures and equally vulnerable to internal electrical short
circuits caused by excessive system contaminants.
In either of these instances, an electrical short between the
terminal and the compressor housing may result in the loss
of integrity between the terminal and its dielectric embed-
ment. This loss may cause the terminals to be expelled,
thereby venting the vaporous and liquid contents of the
compressor housing and system.
A venting compressor terminal normally presents no dan-
ger to anyone, providing the terminal protective cover is
properly in place.
If, however, the terminal protective cover is not properly in
place, a venting terminal may discharge a combination of
(a) hot lubricating oil and refrigerant
(b) ammable mixture (if system is contaminated with air)
in a stream of spray which may be dangerous to anyone in
the vicinity. Death or serious bodily injury could occur.
Under no circumstances is a hermetic compressor to be
electrically energized and/or operated without having the
terminal protective cover properly in place.
See Service Section for proper servicing.
T
O
AVOID
POSSIBLE
EXPLOSION
:
•U
SE
ONLY
RETURNABLE
(
NOT
DISPOSABLE
)
SERVICE
CYLINDERS
WHEN
REMOVING
REFRIGERANT
FROM
A
SYSTEM
.
•E
NSURE
THE
CYLINDER
IS
FREE
OF
DAMAGE
WHICH
COULD
LEAD
TO
A
LEAK
OR
EXPLOSION
.
•E
NSURE
THE
HYDROSTATIC
TEST
DATE
DOES
NOT
EXCEED
5
YEARS
.
•E
NSURE
THE
PRESSURE
RATING
MEETS
OR
EXCEEDS
400
LBS
.
W
HEN
IN
DOUBT
,
DO
NOT
USE
THE
CYLINDER
.
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