®
550.38-N1Y
4
Unitary Products Group
FIGURE 2 : POSITIONING GROMMETS
VERIFY INDOOR REFRIGERANT ORIFICE
Refer to the Tabular Data Sheet for the outdoor unit model
and installed evaporator coil. Determine the correct orifice for
that combination.
If the orifice sizes match, nothing further is required and the
refrigerant lines may be connected per the outdoor unit
instruction. However, if another orifice should be used,
change the orifice in the coil with the following procedure:
1.
First, relieve the holding charge by depressing the
Schrader valve located in the end of the liquid line.
2.
Remove the liquid line fitting using 3/4" wrenches, and
remove the pre-installed orifice with a small diameter
wire or paper clip.
3.
Remove the new orifice from the packet and verify that it
is the correct number required. Install this orifice with the
rounded end toward the coil and the flat end outward per
Figure 3 on page 4.
4.
Thread the liquid line fitting back in place on the coil.
Tighten the fitting hand tight and turn an additional 1/8
turn to seal.
NOTE: This procedure should be done within 2 minutes to
keep air and contaminates from entering the coil. If the
orifice cannot be replaced and the coil resealed within
2 minutes, then it should be temporarily closed to air
using masking tape (short term delay) or plugging/cap-
ping (long term delay). There is no need to purge the
coil if this procedure is done within the time limit.
5.
Mark the data plate of the coil with the orifice installed.
INSTALLATIONS REQUIRING TXV
For installations requiring a TXV, the following are the basic
steps for installion. For detailed instructions, refer to the
Installation Instructions accompanying the TXV kit.
Install TXV kit as follows:
1.
First, relieve the holding charge by depressing the
Schrader valve located in the end of the liquid line.
FIGURE 3 : ORIFICE INSTALLATION
U N I T
B A S E
P A N
R U B B E R
E L E V A T I N G
G R O M M E T S
( 4 )
N o t e :
D o N o t b l o c k d r a i n a g e
h o l e s w i t h g r o m m e t s .
U N I T
B A S E
P A N
R U B B E R
E L E V A T I N G
G R O M M E T S
( 4 )
D I S T R I B U T O R
O R I F I C E
L I Q U I D L I N E
S W I V E L C O U P L I N G
( S e e C A U T I O N b e l o w
)
Coil is under 30 PSIG helium pressure. Relieve pres-
sure from schrader valve on liquid line side.
This fitting is a right-hand thread, turn counter-clock-
wise to remove.
Use 3/4" wrenches to turn fittings. Using pliers will
cause internal damage to the fitting.
