1. Remove the cap and Schrader core from both the liquid and suction service valve
service ports at the outdoor unit. Connect 40 PSI nitrogen to the liquid line service
port.
Connect the refrigerant lines using the following procedure:
2. Braze the liquid line to the liquid valve at the outdoor unit. Be sure to wrap the valve
body with a wet rag. Allow the nitrogen to continue flowing. Refer to the Tabular Data
Sheet for proper liquid line sizing.
3. Carefully remove the rubber plugs from the evaporator liquid and suction connections
at the indoor coil.
4. Braze the liquid line to the evaporator liquid connection. Nitrogen should be flowing
through the evaporator coil.
5. Remove the plastic cap away from the suction connection at the indoor coil. Braze the
suction line to the evaporator suction connection. Refer to the Table 1 for proper
suction line sizing.
6. Protect the suction valve with a wet rag and braze the suction line connection to the
outdoor unit. The nitrogen flow should be exiting the system from the suction service
port connection. After this connection has cooled, remove the nitrogen source from
the liquid fitting service port.
7. Replace the Schrader core in the liquid and suction valves.
8. Leak test all refrigerant piping connections including the service port flare caps to be
sure they are leak tight.
DO NOT OVER TIGHTEN (between 40 and 60 inch -lbs.
maximum).
9. Evacuate the suction line, evaporator, and the liquid line, to 350 microns or less.
Table 1: Recommended Liquid and Suction Tube Diameters (ln.)
MODEL SIZE
LIQUID
SUCTION
Tube Diameter
Tube Diameter
18
3/8
3/4
24
3/8
3/4
30
3/8
3/4
36
3/8
3/4
42
3/8
48
3/8
60
3/8
7/8
11
3/4
7/8
NOTE
NOTE
Fig.8 Heat Protection
NOTE:
service valve
wet rag
14 SEER
C
RE
D
YE
LLO
W
GR
EE
N
Y
R
G
INDOOR UNIT
OUTDOOR UNIT
G
C
Y
B
LA
C
K
R
C
B
LA
C
K
GROUND
PLUG PLA TE
