C O P P E R
2 S C R E W S
C O R N E R
P O S T
S E R V I C E P O R T S I N S H I P P I N G P O S I T I O N
U N I T W A L L
S I D E V I E W
C O P P E R
T U B E
U N I T
W A L L
C O P P E R
2 S C R E W S
C O R N E R
P O S T
T O P V I E W
U N I T
W A L L
L O O S E N
S C R E W S
S I D E V I E W
( A S S H I P P E D )
P U S H S E R V I C E
P O R T S T H R O U G H
C O R N E R P O S T
T I G H T E N S C R E W S
S I D E V I E W
S E R V I C E P O R T S
E X T E N D E D
( )
S E R V I C E P O R T S
E X T E N D E D
( )
S E R V I C E P O R T S I N I N S T A L L E D P O S I T I O N
FIG. 6 - EXTENDING THE SERVICE PORTS
Alternate Charging Methods
If you are starting a unit when the ambient temperature is higher
or lower than those shown in Fig. 7, either of the following
methods may be used.
Method 1: Determine the total weight of the refrigerant for the
total system by adding the required charge for the
outdoor unit, the indoor unit and the refrigerant lines
using information in Tables 2 (Physical Data) and 6
(Refrigerant Line Charge).
Using the charging procedures outlined above, weigh the re-
quired amount of refrigerant charge into the unit.
Method 2: Install a field supplied moisture indicating sight
glass in the liquid line between the filter-drier and
the evaporator coil.
Using the charging procedure outlined above, charge refriger-
ant until the moisture indicating sight glass is clear. Add ap-
proximately 2 extra pounds of refrigerant to assure a liquid
refrigerant seal at the expansion valve under all operating
conditions. Block the flow of the condenser air, if necessary, to
assure a head pressure of 280 psig during the charging proce-
dure.
Note:
The installer should return to the job to verify the
operating charge when the ambient temperature is
within the conditions shown in Fig. 7.
550.23-N6Y
10
Unitary Products Group
