Lennox International Inc. 10ACB - Manual (Page 5)

3DJH 
Expansion Valve Systems
Expansion valves equipped with either “Chatleff” or
flare type fittings are available from Lennox. Refer to
the indoor coil installation instructions or the engineer-
ing handbook for applicable expansion valves for use
with specific match--ups.
If an expansion valve application is desired with indoor
coil product shipped with an RFCIV orifice, the RFCIV re-
strictor must be removed before installing the expan-
sion valve.
IMPORTANT
Failure to remove RFCIV when installing an expan-
sion valve to the indoor coil will result in improper
operation and damage to the system.
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A manifold gauge set equipped with “low loss” hoses
should be used when checking unit charge. A manifold
gauge set with anything other than “low loss” hose
should not be used.
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The liquid line and suction line service valves (figures 4
and 5) and gauge ports are accessible from outside the
unit. The service ports are used for leak testing, eva-
cuating, charging and checking charge.
The valve is equipped with a service port. A schrader
valve is factory installed. A service port cap is supplied to
protect the schrader valve from contamination and serve
as the primary leak seal.
To Access Schrader Port:
1-- Remove service port cap with an adjustable wrench.
2-- Connect gauge to the service port.
3-- When testing is completed, replace service port cap.
Tighten finger tight, then an additional 1/6 turn.
To Open Liquid or Suction Line Service Valve:
1-- Remove stem cap with an adjustable wrench.
2-- Using service wrench and 5/16” hex head extension
back the stem out counterclockwise until the valve
stem just touches the retaining ring.
Do not attempt to backseat this valve. Attempts to
backseat this valve will cause snap ring to explode
from valve body under pressure of refrigerant.
Personal injury and unit damage will result.
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3-- Replace stem cap tighten firmly. Tighten finger tight,
then tighten an additional 1/6 turn.
FIGURE 4
LIQUID LINE SERVICE VALVE (VALVE OPEN)
SCHRADER
VALVE
SERVICE
PORT
SERVICE
PORT
CAP
INSERT HEX
WRENCH HERE
TO INDOOR
COIL
TO OUTDOOR
COIL
STEM CAP
SCHRADER VALVE OPEN
TO LINE SET WHEN VALVE
IS CLOSED (FRONT SEATED)
SERVICE
PORT
SERVICE
PORT CAP
RETAINING RING STEM CAP
INSERT HEX
WRENCH HERE
LIQUID LINE SERVICE VALVE (VALVE CLOSED)
(VALVE FRONT SEATED)
TO OUTDOOR
COIL
TO INDOOR
COIL
To Close Liquid or Suction Line Service Valve:
1-- Remove stem cap with an adjustable wrench.
2-- Using service wrench and 5/16” hex head exten-
sion, turn stem clockwise to seat the valve. Tighten
firmly.